nsLayoutUtils.cpp
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 sw=2 et tw=78: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "base/basictypes.h"
#include "mozilla/Util.h"
#include "nsLayoutUtils.h"
#include "nsIFormControlFrame.h"
#include "nsPresContext.h"
#include "nsIContent.h"
#include "nsIDOMHTMLDocument.h"
#include "nsIDOMHTMLElement.h"
#include "nsFrameList.h"
#include "nsGkAtoms.h"
#include "nsIAtom.h"
#include "nsCSSPseudoElements.h"
#include "nsCSSAnonBoxes.h"
#include "nsCSSColorUtils.h"
#include "nsView.h"
#include "nsPlaceholderFrame.h"
#include "nsIScrollableFrame.h"
#include "nsCSSFrameConstructor.h"
#include "nsIDOMEvent.h"
#include "nsGUIEvent.h"
#include "nsDisplayList.h"
#include "nsRegion.h"
#include "nsFrameManager.h"
#include "nsBlockFrame.h"
#include "nsBidiPresUtils.h"
#include "imgIContainer.h"
#include "gfxRect.h"
#include "gfxContext.h"
#include "gfxFont.h"
#include "nsRenderingContext.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsCSSRendering.h"
#include "nsContentUtils.h"
#include "nsCxPusher.h"
#include "nsThemeConstants.h"
#include "nsPIDOMWindow.h"
#include "nsIBaseWindow.h"
#include "nsIDocShell.h"
#include "nsIWidget.h"
#include "gfxMatrix.h"
#include "gfxPoint3D.h"
#include "gfxTypes.h"
#include "gfxUserFontSet.h"
#include "nsTArray.h"
#include "mozilla/dom/HTMLCanvasElement.h"
#include "nsICanvasRenderingContextInternal.h"
#include "gfxPlatform.h"
#include "nsClientRect.h"
#include <algorithm>
#include "mozilla/dom/HTMLVideoElement.h"
#include "mozilla/dom/HTMLImageElement.h"
#include "imgIRequest.h"
#include "nsIImageLoadingContent.h"
#include "nsCOMPtr.h"
#include "nsCSSProps.h"
#include "nsListControlFrame.h"
#include "ImageLayers.h"
#include "mozilla/arm.h"
#include "mozilla/dom/Element.h"
#include "nsCanvasFrame.h"
#include "gfxDrawable.h"
#include "gfxUtils.h"
#include "nsDataHashtable.h"
#include "nsTextFrame.h"
#include "nsFontFaceList.h"
#include "nsFontInflationData.h"
#include "nsSVGUtils.h"
#include "nsSVGIntegrationUtils.h"
#include "nsSVGForeignObjectFrame.h"
#include "nsSVGOuterSVGFrame.h"
#include "nsSVGTextFrame2.h"
#include "nsStyleStructInlines.h"
#include "nsStyleTransformMatrix.h"
#include "mozilla/dom/PBrowserChild.h"
#include "mozilla/dom/TabChild.h"
#include "mozilla/Preferences.h"
#ifdef MOZ_XUL
#include "nsXULPopupManager.h"
#endif
#include "GeckoProfiler.h"
#include "nsAnimationManager.h"
#include "nsTransitionManager.h"
#include "nsViewportInfo.h"
using namespace mozilla;
using namespace mozilla::css;
using namespace mozilla::dom;
using namespace mozilla::layers;
using namespace mozilla::layout;
#define FLEXBOX_ENABLED_PREF_NAME "layout.css.flexbox.enabled"
#ifdef DEBUG
// TODO: remove, see bug 598468.
bool nsLayoutUtils::gPreventAssertInCompareTreePosition = false;
#endif // DEBUG
typedef gfxPattern::GraphicsFilter GraphicsFilter;
typedef FrameMetrics::ViewID ViewID;
/* static */ uint32_t nsLayoutUtils::sFontSizeInflationEmPerLine;
/* static */ uint32_t nsLayoutUtils::sFontSizeInflationMinTwips;
/* static */ uint32_t nsLayoutUtils::sFontSizeInflationLineThreshold;
/* static */ int32_t nsLayoutUtils::sFontSizeInflationMappingIntercept;
/* static */ uint32_t nsLayoutUtils::sFontSizeInflationMaxRatio;
/* static */ bool nsLayoutUtils::sFontSizeInflationForceEnabled;
/* static */ bool nsLayoutUtils::sFontSizeInflationDisabledInMasterProcess;
/* static */ bool nsLayoutUtils::sInvalidationDebuggingIsEnabled;
static ViewID sScrollIdCounter = FrameMetrics::START_SCROLL_ID;
// These are indices into kDisplayKTable. They'll be initialized
// the first time that FlexboxEnabledPrefChangeCallback() is invoked.
static int32_t sIndexOfFlexInDisplayTable;
static int32_t sIndexOfInlineFlexInDisplayTable;
// This tracks whether those ^^ indices have been initialized
static bool sAreFlexKeywordIndicesInitialized = false;
typedef nsDataHashtable<nsUint64HashKey, nsIContent*> ContentMap;
static ContentMap* sContentMap = nullptr;
static ContentMap& GetContentMap() {
if (!sContentMap) {
sContentMap = new ContentMap();
sContentMap->Init();
}
return *sContentMap;
}
// When the pref "layout.css.flexbox.enabled" changes, this function is invoked
// to let us update kDisplayKTable, to selectively disable or restore the
// entries for "flex" and "inline-flex" in that table.
static int
FlexboxEnabledPrefChangeCallback(const char* aPrefName, void* aClosure)
{
MOZ_ASSERT(strncmp(aPrefName, FLEXBOX_ENABLED_PREF_NAME,
NS_ARRAY_LENGTH(FLEXBOX_ENABLED_PREF_NAME)) == 0,
"We only registered this callback for a single pref, so it "
"should only be called for that pref");
bool isFlexboxEnabled =
Preferences::GetBool(FLEXBOX_ENABLED_PREF_NAME, false);
if (!sAreFlexKeywordIndicesInitialized) {
// First run: find the position of "flex" and "inline-flex" in
// kDisplayKTable.
sIndexOfFlexInDisplayTable =
nsCSSProps::FindIndexOfKeyword(eCSSKeyword_flex,
nsCSSProps::kDisplayKTable);
sIndexOfInlineFlexInDisplayTable =
nsCSSProps::FindIndexOfKeyword(eCSSKeyword_inline_flex,
nsCSSProps::kDisplayKTable);
sAreFlexKeywordIndicesInitialized = true;
}
// OK -- now, stomp on or restore the "flex" entries in kDisplayKTable,
// depending on whether the flexbox pref is enabled vs. disabled.
if (sIndexOfFlexInDisplayTable >= 0) {
nsCSSProps::kDisplayKTable[sIndexOfFlexInDisplayTable] =
isFlexboxEnabled ? eCSSKeyword_flex : eCSSKeyword_UNKNOWN;
}
if (sIndexOfInlineFlexInDisplayTable >= 0) {
nsCSSProps::kDisplayKTable[sIndexOfInlineFlexInDisplayTable] =
isFlexboxEnabled ? eCSSKeyword_inline_flex : eCSSKeyword_UNKNOWN;
}
return 0;
}
template <class AnimationsOrTransitions>
static AnimationsOrTransitions*
HasAnimationOrTransition(nsIContent* aContent,
nsIAtom* aAnimationProperty,
nsCSSProperty aProperty)
{
AnimationsOrTransitions* animations =
static_cast<AnimationsOrTransitions*>(aContent->GetProperty(aAnimationProperty));
if (animations) {
bool propertyMatches = animations->HasAnimationOfProperty(aProperty);
if (propertyMatches &&
animations->CanPerformOnCompositorThread(
CommonElementAnimationData::CanAnimate_AllowPartial)) {
return animations;
}
}
return nullptr;
}
bool
nsLayoutUtils::HasAnimationsForCompositor(nsIContent* aContent,
nsCSSProperty aProperty)
{
if (!aContent->MayHaveAnimations())
return false;
if (HasAnimationOrTransition<ElementAnimations>
(aContent, nsGkAtoms::animationsProperty, aProperty)) {
return true;
}
return HasAnimationOrTransition<ElementTransitions>
(aContent, nsGkAtoms::transitionsProperty, aProperty);
}
static gfxSize
GetScaleForValue(const nsStyleAnimation::Value& aValue,
nsIFrame* aFrame)
{
if (!aFrame) {
NS_WARNING("No frame.");
return gfxSize();
}
if (aValue.GetUnit() != nsStyleAnimation::eUnit_Transform) {
NS_WARNING("Expected a transform.");
return gfxSize();
}
nsCSSValueList* values = aValue.GetCSSValueListValue();
if (values->mValue.GetUnit() == eCSSUnit_None) {
// There is an animation, but no actual transform yet.
return gfxSize();
}
nsRect frameBounds = aFrame->GetRect();
bool dontCare;
gfx3DMatrix transform = nsStyleTransformMatrix::ReadTransforms(
aValue.GetCSSValueListValue(),
aFrame->StyleContext(),
aFrame->PresContext(), dontCare, frameBounds,
aFrame->PresContext()->AppUnitsPerDevPixel());
gfxMatrix transform2d;
bool canDraw2D = transform.CanDraw2D(&transform2d);
if (!canDraw2D) {
return gfxSize();
}
return transform2d.ScaleFactors(true);
}
gfxSize
nsLayoutUtils::GetMaximumAnimatedScale(nsIContent* aContent)
{
gfxSize result;
ElementAnimations* animations = HasAnimationOrTransition<ElementAnimations>
(aContent, nsGkAtoms::animationsProperty, eCSSProperty_transform);
if (animations) {
for (uint32_t animIdx = animations->mAnimations.Length(); animIdx-- != 0; ) {
ElementAnimation& anim = animations->mAnimations[animIdx];
for (uint32_t propIdx = anim.mProperties.Length(); propIdx-- != 0; ) {
AnimationProperty& prop = anim.mProperties[propIdx];
if (prop.mProperty == eCSSProperty_transform) {
for (uint32_t segIdx = prop.mSegments.Length(); segIdx-- != 0; ) {
AnimationPropertySegment& segment = prop.mSegments[segIdx];
gfxSize from = GetScaleForValue(segment.mFromValue,
aContent->GetPrimaryFrame());
result.width = std::max<float>(result.width, from.width);
result.height = std::max<float>(result.height, from.height);
gfxSize to = GetScaleForValue(segment.mToValue,
aContent->GetPrimaryFrame());
result.width = std::max<float>(result.width, to.width);
result.height = std::max<float>(result.height, to.height);
}
}
}
}
}
ElementTransitions* transitions = HasAnimationOrTransition<ElementTransitions>
(aContent, nsGkAtoms::transitionsProperty, eCSSProperty_transform);
if (transitions) {
for (uint32_t i = 0, i_end = transitions->mPropertyTransitions.Length();
i < i_end; ++i)
{
ElementPropertyTransition &pt = transitions->mPropertyTransitions[i];
if (pt.IsRemovedSentinel()) {
continue;
}
if (pt.mProperty == eCSSProperty_transform) {
gfxSize start = GetScaleForValue(pt.mStartValue,
aContent->GetPrimaryFrame());
result.width = std::max<float>(result.width, start.width);
result.height = std::max<float>(result.height, start.height);
gfxSize end = GetScaleForValue(pt.mEndValue,
aContent->GetPrimaryFrame());
result.width = std::max<float>(result.width, end.width);
result.height = std::max<float>(result.height, end.height);
}
}
}
// If we didn't manage to find a max scale, use no scale rather than 0,0
if (result == gfxSize()) {
return gfxSize(1, 1);
}
return result;
}
bool
nsLayoutUtils::AreAsyncAnimationsEnabled()
{
static bool sAreAsyncAnimationsEnabled;
static bool sAsyncPrefCached = false;
if (!sAsyncPrefCached) {
sAsyncPrefCached = true;
Preferences::AddBoolVarCache(&sAreAsyncAnimationsEnabled,
"layers.offmainthreadcomposition.async-animations");
}
return sAreAsyncAnimationsEnabled &&
gfxPlatform::OffMainThreadCompositingEnabled();
}
bool
nsLayoutUtils::IsAnimationLoggingEnabled()
{
static bool sShouldLog;
static bool sShouldLogPrefCached;
if (!sShouldLogPrefCached) {
sShouldLogPrefCached = true;
Preferences::AddBoolVarCache(&sShouldLog,
"layers.offmainthreadcomposition.log-animations");
}
return sShouldLog;
}
bool
nsLayoutUtils::UseBackgroundNearestFiltering()
{
static bool sUseBackgroundNearestFilteringEnabled;
static bool sUseBackgroundNearestFilteringPrefInitialised = false;
if (!sUseBackgroundNearestFilteringPrefInitialised) {
sUseBackgroundNearestFilteringPrefInitialised = true;
sUseBackgroundNearestFilteringEnabled =
Preferences::GetBool("gfx.filter.nearest.force-enabled", false);
}
return sUseBackgroundNearestFilteringEnabled;
}
bool
nsLayoutUtils::GPUImageScalingEnabled()
{
static bool sGPUImageScalingEnabled;
static bool sGPUImageScalingPrefInitialised = false;
if (!sGPUImageScalingPrefInitialised) {
sGPUImageScalingPrefInitialised = true;
sGPUImageScalingEnabled =
Preferences::GetBool("layout.gpu-image-scaling.enabled", false);
}
return sGPUImageScalingEnabled;
}
bool
nsLayoutUtils::AnimatedImageLayersEnabled()
{
static bool sAnimatedImageLayersEnabled;
static bool sAnimatedImageLayersPrefCached = false;
if (!sAnimatedImageLayersPrefCached) {
sAnimatedImageLayersPrefCached = true;
Preferences::AddBoolVarCache(&sAnimatedImageLayersEnabled,
"layout.animated-image-layers.enabled",
false);
}
return sAnimatedImageLayersEnabled;
}
void
nsLayoutUtils::UnionChildOverflow(nsIFrame* aFrame,
nsOverflowAreas& aOverflowAreas)
{
// Iterate over all children except pop-ups.
const nsIFrame::ChildListIDs skip(nsIFrame::kPopupList |
nsIFrame::kSelectPopupList);
for (nsIFrame::ChildListIterator childLists(aFrame);
!childLists.IsDone(); childLists.Next()) {
if (skip.Contains(childLists.CurrentID())) {
continue;
}
nsFrameList children = childLists.CurrentList();
for (nsFrameList::Enumerator e(children); !e.AtEnd(); e.Next()) {
nsIFrame* child = e.get();
nsOverflowAreas childOverflow =
child->GetOverflowAreas() + child->GetPosition();
aOverflowAreas.UnionWith(childOverflow);
}
}
}
static void DestroyViewID(void* aObject, nsIAtom* aPropertyName,
void* aPropertyValue, void* aData)
{
ViewID* id = static_cast<ViewID*>(aPropertyValue);
GetContentMap().Remove(*id);
delete id;
}
/**
* A namespace class for static layout utilities.
*/
ViewID
nsLayoutUtils::FindIDFor(nsIContent* aContent)
{
ViewID scrollId;
void* scrollIdProperty = aContent->GetProperty(nsGkAtoms::RemoteId);
if (scrollIdProperty) {
scrollId = *static_cast<ViewID*>(scrollIdProperty);
} else {
scrollId = sScrollIdCounter++;
aContent->SetProperty(nsGkAtoms::RemoteId, new ViewID(scrollId),
DestroyViewID);
GetContentMap().Put(scrollId, aContent);
}
return scrollId;
}
nsIContent*
nsLayoutUtils::FindContentFor(ViewID aId)
{
NS_ABORT_IF_FALSE(aId != FrameMetrics::NULL_SCROLL_ID &&
aId != FrameMetrics::ROOT_SCROLL_ID,
"Cannot find a content element in map for null or root IDs.");
nsIContent* content;
bool exists = GetContentMap().Get(aId, &content);
if (exists) {
return content;
} else {
return nullptr;
}
}
bool
nsLayoutUtils::GetDisplayPort(nsIContent* aContent, nsRect *aResult)
{
void* property = aContent->GetProperty(nsGkAtoms::DisplayPort);
if (!property) {
return false;
}
if (aResult) {
*aResult = *static_cast<nsRect*>(property);
}
return true;
}
bool
nsLayoutUtils::GetCriticalDisplayPort(nsIContent* aContent, nsRect* aResult)
{
void* property = aContent->GetProperty(nsGkAtoms::CriticalDisplayPort);
if (!property) {
return false;
}
if (aResult) {
*aResult = *static_cast<nsRect*>(property);
}
return true;
}
nsIFrame*
nsLayoutUtils::GetLastContinuationWithChild(nsIFrame* aFrame)
{
NS_PRECONDITION(aFrame, "NULL frame pointer");
aFrame = aFrame->GetLastContinuation();
while (!aFrame->GetFirstPrincipalChild() &&
aFrame->GetPrevContinuation()) {
aFrame = aFrame->GetPrevContinuation();
}
return aFrame;
}
/**
* GetFirstChildFrame returns the first "real" child frame of a
* given frame. It will descend down into pseudo-frames (unless the
* pseudo-frame is the :before generated frame).
* @param aFrame the frame
* @param aFrame the frame's content node
*/
static nsIFrame*
GetFirstChildFrame(nsIFrame* aFrame,
nsIContent* aContent)
{
NS_PRECONDITION(aFrame, "NULL frame pointer");
// Get the first child frame
nsIFrame* childFrame = aFrame->GetFirstPrincipalChild();
// If the child frame is a pseudo-frame, then return its first child.
// Note that the frame we create for the generated content is also a
// pseudo-frame and so don't drill down in that case
if (childFrame &&
childFrame->IsPseudoFrame(aContent) &&
!childFrame->IsGeneratedContentFrame()) {
return GetFirstChildFrame(childFrame, aContent);
}
return childFrame;
}
/**
* GetLastChildFrame returns the last "real" child frame of a
* given frame. It will descend down into pseudo-frames (unless the
* pseudo-frame is the :after generated frame).
* @param aFrame the frame
* @param aFrame the frame's content node
*/
static nsIFrame*
GetLastChildFrame(nsIFrame* aFrame,
nsIContent* aContent)
{
NS_PRECONDITION(aFrame, "NULL frame pointer");
// Get the last continuation frame that's a parent
nsIFrame* lastParentContinuation =
nsLayoutUtils::GetLastContinuationWithChild(aFrame);
nsIFrame* lastChildFrame =
lastParentContinuation->GetLastChild(nsIFrame::kPrincipalList);
if (lastChildFrame) {
// Get the frame's first continuation. This matters in case the frame has
// been continued across multiple lines or split by BiDi resolution.
lastChildFrame = lastChildFrame->GetFirstContinuation();
// If the last child frame is a pseudo-frame, then return its last child.
// Note that the frame we create for the generated content is also a
// pseudo-frame and so don't drill down in that case
if (lastChildFrame &&
lastChildFrame->IsPseudoFrame(aContent) &&
!lastChildFrame->IsGeneratedContentFrame()) {
return GetLastChildFrame(lastChildFrame, aContent);
}
return lastChildFrame;
}
return nullptr;
}
//static
nsIFrame::ChildListID
nsLayoutUtils::GetChildListNameFor(nsIFrame* aChildFrame)
{
nsIFrame::ChildListID id = nsIFrame::kPrincipalList;
if (aChildFrame->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER) {
nsIFrame* pif = aChildFrame->GetPrevInFlow();
if (pif->GetParent() == aChildFrame->GetParent()) {
id = nsIFrame::kExcessOverflowContainersList;
}
else {
id = nsIFrame::kOverflowContainersList;
}
}
// See if the frame is moved out of the flow
else if (aChildFrame->GetStateBits() & NS_FRAME_OUT_OF_FLOW) {
// Look at the style information to tell
const nsStyleDisplay* disp = aChildFrame->StyleDisplay();
if (NS_STYLE_POSITION_ABSOLUTE == disp->mPosition) {
id = nsIFrame::kAbsoluteList;
} else if (NS_STYLE_POSITION_FIXED == disp->mPosition) {
if (nsLayoutUtils::IsReallyFixedPos(aChildFrame)) {
id = nsIFrame::kFixedList;
} else {
id = nsIFrame::kAbsoluteList;
}
#ifdef MOZ_XUL
} else if (NS_STYLE_DISPLAY_POPUP == disp->mDisplay) {
// Out-of-flows that are DISPLAY_POPUP must be kids of the root popup set
#ifdef DEBUG
nsIFrame* parent = aChildFrame->GetParent();
NS_ASSERTION(parent && parent->GetType() == nsGkAtoms::popupSetFrame,
"Unexpected parent");
#endif // DEBUG
// XXX FIXME: Bug 350740
// Return here, because the postcondition for this function actually
// fails for this case, since the popups are not in a "real" frame list
// in the popup set.
return nsIFrame::kPopupList;
#endif // MOZ_XUL
} else {
NS_ASSERTION(aChildFrame->IsFloating(), "not a floated frame");
id = nsIFrame::kFloatList;
}
} else {
nsIAtom* childType = aChildFrame->GetType();
if (nsGkAtoms::menuPopupFrame == childType) {
nsIFrame* parent = aChildFrame->GetParent();
nsIFrame* firstPopup = (parent)
? parent->GetFirstChild(nsIFrame::kPopupList)
: nullptr;
NS_ASSERTION(!firstPopup || !firstPopup->GetNextSibling(),
"We assume popupList only has one child, but it has more.");
id = firstPopup == aChildFrame
? nsIFrame::kPopupList
: nsIFrame::kPrincipalList;
} else if (nsGkAtoms::tableColGroupFrame == childType) {
id = nsIFrame::kColGroupList;
} else if (nsGkAtoms::tableCaptionFrame == aChildFrame->GetType()) {
id = nsIFrame::kCaptionList;
} else {
id = nsIFrame::kPrincipalList;
}
}
#ifdef DEBUG
// Verify that the frame is actually in that child list or in the
// corresponding overflow list.
nsIFrame* parent = aChildFrame->GetParent();
bool found = parent->GetChildList(id).ContainsFrame(aChildFrame);
if (!found) {
if (!(aChildFrame->GetStateBits() & NS_FRAME_OUT_OF_FLOW)) {
found = parent->GetChildList(nsIFrame::kOverflowList)
.ContainsFrame(aChildFrame);
}
else if (aChildFrame->IsFloating()) {
found = parent->GetChildList(nsIFrame::kOverflowOutOfFlowList)
.ContainsFrame(aChildFrame);
if (!found) {
found = parent->GetChildList(nsIFrame::kPushedFloatsList)
.ContainsFrame(aChildFrame);
}
}
// else it's positioned and should have been on the 'id' child list.
NS_POSTCONDITION(found, "not in child list");
}
#endif
return id;
}
// static
nsIFrame*
nsLayoutUtils::GetBeforeFrame(nsIFrame* aFrame)
{
NS_PRECONDITION(aFrame, "NULL frame pointer");
NS_ASSERTION(!aFrame->GetPrevContinuation(),
"aFrame must be first continuation");
nsIFrame* firstFrame = GetFirstChildFrame(aFrame, aFrame->GetContent());
if (firstFrame && IsGeneratedContentFor(nullptr, firstFrame,
nsCSSPseudoElements::before)) {
return firstFrame;
}
return nullptr;
}
// static
nsIFrame*
nsLayoutUtils::GetAfterFrame(nsIFrame* aFrame)
{
NS_PRECONDITION(aFrame, "NULL frame pointer");
nsIFrame* lastFrame = GetLastChildFrame(aFrame, aFrame->GetContent());
if (lastFrame && IsGeneratedContentFor(nullptr, lastFrame,
nsCSSPseudoElements::after)) {
return lastFrame;
}
return nullptr;
}
// static
nsIFrame*
nsLayoutUtils::GetClosestFrameOfType(nsIFrame* aFrame, nsIAtom* aFrameType)
{
for (nsIFrame* frame = aFrame; frame; frame = frame->GetParent()) {
if (frame->GetType() == aFrameType) {
return frame;
}
}
return nullptr;
}
// static
nsIFrame*
nsLayoutUtils::GetStyleFrame(nsIFrame* aFrame)
{
if (aFrame->GetType() == nsGkAtoms::tableOuterFrame) {
nsIFrame* inner = aFrame->GetFirstPrincipalChild();
NS_ASSERTION(inner, "Outer table must have an inner");
return inner;
}
return aFrame;
}
nsIFrame*
nsLayoutUtils::GetFloatFromPlaceholder(nsIFrame* aFrame) {
NS_ASSERTION(nsGkAtoms::placeholderFrame == aFrame->GetType(),
"Must have a placeholder here");
if (aFrame->GetStateBits() & PLACEHOLDER_FOR_FLOAT) {
nsIFrame *outOfFlowFrame =
nsPlaceholderFrame::GetRealFrameForPlaceholder(aFrame);
NS_ASSERTION(outOfFlowFrame->IsFloating(),
"How did that happen?");
return outOfFlowFrame;
}
return nullptr;
}
// static
bool
nsLayoutUtils::IsGeneratedContentFor(nsIContent* aContent,
nsIFrame* aFrame,
nsIAtom* aPseudoElement)
{
NS_PRECONDITION(aFrame, "Must have a frame");
NS_PRECONDITION(aPseudoElement, "Must have a pseudo name");
if (!aFrame->IsGeneratedContentFrame()) {
return false;
}
nsIFrame* parent = aFrame->GetParent();
NS_ASSERTION(parent, "Generated content can't be root frame");
if (parent->IsGeneratedContentFrame()) {
// Not the root of the generated content
return false;
}
if (aContent && parent->GetContent() != aContent) {
return false;
}
return (aFrame->GetContent()->Tag() == nsGkAtoms::mozgeneratedcontentbefore) ==
(aPseudoElement == nsCSSPseudoElements::before);
}
// static
nsIFrame*
nsLayoutUtils::GetCrossDocParentFrame(const nsIFrame* aFrame,
nsPoint* aExtraOffset)
{
nsIFrame* p = aFrame->GetParent();
if (p)
return p;
nsView* v = aFrame->GetView();
if (!v)
return nullptr;
v = v->GetParent(); // anonymous inner view
if (!v)
return nullptr;
if (aExtraOffset) {
*aExtraOffset += v->GetPosition();
}
v = v->GetParent(); // subdocumentframe's view
return v ? v->GetFrame() : nullptr;
}
// static
bool
nsLayoutUtils::IsProperAncestorFrameCrossDoc(nsIFrame* aAncestorFrame, nsIFrame* aFrame,
nsIFrame* aCommonAncestor)
{
if (aFrame == aAncestorFrame)
return false;
return IsAncestorFrameCrossDoc(aAncestorFrame, aFrame, aCommonAncestor);
}
// static
bool
nsLayoutUtils::IsAncestorFrameCrossDoc(const nsIFrame* aAncestorFrame, const nsIFrame* aFrame,
const nsIFrame* aCommonAncestor)
{
for (const nsIFrame* f = aFrame; f != aCommonAncestor;
f = GetCrossDocParentFrame(f)) {
if (f == aAncestorFrame)
return true;
}
return aCommonAncestor == aAncestorFrame;
}
// static
bool
nsLayoutUtils::IsProperAncestorFrame(nsIFrame* aAncestorFrame, nsIFrame* aFrame,
nsIFrame* aCommonAncestor)
{
if (aFrame == aAncestorFrame)
return false;
for (nsIFrame* f = aFrame; f != aCommonAncestor; f = f->GetParent()) {
if (f == aAncestorFrame)
return true;
}
return aCommonAncestor == aAncestorFrame;
}
// static
int32_t
nsLayoutUtils::DoCompareTreePosition(nsIContent* aContent1,
nsIContent* aContent2,
int32_t aIf1Ancestor,
int32_t aIf2Ancestor,
const nsIContent* aCommonAncestor)
{
NS_PRECONDITION(aContent1, "aContent1 must not be null");
NS_PRECONDITION(aContent2, "aContent2 must not be null");
nsAutoTArray<nsINode*, 32> content1Ancestors;
nsINode* c1;
for (c1 = aContent1; c1 && c1 != aCommonAncestor; c1 = c1->GetParentNode()) {
content1Ancestors.AppendElement(c1);
}
if (!c1 && aCommonAncestor) {
// So, it turns out aCommonAncestor was not an ancestor of c1. Oops.
// Never mind. We can continue as if aCommonAncestor was null.
aCommonAncestor = nullptr;
}
nsAutoTArray<nsINode*, 32> content2Ancestors;
nsINode* c2;
for (c2 = aContent2; c2 && c2 != aCommonAncestor; c2 = c2->GetParentNode()) {
content2Ancestors.AppendElement(c2);
}
if (!c2 && aCommonAncestor) {
// So, it turns out aCommonAncestor was not an ancestor of c2.
// We need to retry with no common ancestor hint.
return DoCompareTreePosition(aContent1, aContent2,
aIf1Ancestor, aIf2Ancestor, nullptr);
}
int last1 = content1Ancestors.Length() - 1;
int last2 = content2Ancestors.Length() - 1;
nsINode* content1Ancestor = nullptr;
nsINode* content2Ancestor = nullptr;
while (last1 >= 0 && last2 >= 0
&& ((content1Ancestor = content1Ancestors.ElementAt(last1)) ==
(content2Ancestor = content2Ancestors.ElementAt(last2)))) {
last1--;
last2--;
}
if (last1 < 0) {
if (last2 < 0) {
NS_ASSERTION(aContent1 == aContent2, "internal error?");
return 0;
}
// aContent1 is an ancestor of aContent2
return aIf1Ancestor;
}
if (last2 < 0) {
// aContent2 is an ancestor of aContent1
return aIf2Ancestor;
}
// content1Ancestor != content2Ancestor, so they must be siblings with the same parent
nsINode* parent = content1Ancestor->GetParentNode();
#ifdef DEBUG
// TODO: remove the uglyness, see bug 598468.
NS_ASSERTION(gPreventAssertInCompareTreePosition || parent,
"no common ancestor at all???");
#endif // DEBUG
if (!parent) { // different documents??
return 0;
}
int32_t index1 = parent->IndexOf(content1Ancestor);
int32_t index2 = parent->IndexOf(content2Ancestor);
if (index1 < 0 || index2 < 0) {
// one of them must be anonymous; we can't determine the order
return 0;
}
return index1 - index2;
}
static nsIFrame* FillAncestors(nsIFrame* aFrame,
nsIFrame* aStopAtAncestor,
nsTArray<nsIFrame*>* aAncestors)
{
while (aFrame && aFrame != aStopAtAncestor) {
aAncestors->AppendElement(aFrame);
aFrame = nsLayoutUtils::GetParentOrPlaceholderFor(aFrame);
}
return aFrame;
}
// Return true if aFrame1 is after aFrame2
static bool IsFrameAfter(nsIFrame* aFrame1, nsIFrame* aFrame2)
{
nsIFrame* f = aFrame2;
do {
f = f->GetNextSibling();
if (f == aFrame1)
return true;
} while (f);
return false;
}
// static
int32_t
nsLayoutUtils::DoCompareTreePosition(nsIFrame* aFrame1,
nsIFrame* aFrame2,
int32_t aIf1Ancestor,
int32_t aIf2Ancestor,
nsIFrame* aCommonAncestor)
{
NS_PRECONDITION(aFrame1, "aFrame1 must not be null");
NS_PRECONDITION(aFrame2, "aFrame2 must not be null");
nsPresContext* presContext = aFrame1->PresContext();
if (presContext != aFrame2->PresContext()) {
NS_ERROR("no common ancestor at all, different documents");
return 0;
}
nsAutoTArray<nsIFrame*,20> frame1Ancestors;
if (!FillAncestors(aFrame1, aCommonAncestor, &frame1Ancestors)) {
// We reached the root of the frame tree ... if aCommonAncestor was set,
// it is wrong
aCommonAncestor = nullptr;
}
nsAutoTArray<nsIFrame*,20> frame2Ancestors;
if (!FillAncestors(aFrame2, aCommonAncestor, &frame2Ancestors) &&
aCommonAncestor) {
// We reached the root of the frame tree ... aCommonAncestor was wrong.
// Try again with no hint.
return DoCompareTreePosition(aFrame1, aFrame2,
aIf1Ancestor, aIf2Ancestor, nullptr);
}
int32_t last1 = int32_t(frame1Ancestors.Length()) - 1;
int32_t last2 = int32_t(frame2Ancestors.Length()) - 1;
while (last1 >= 0 && last2 >= 0 &&
frame1Ancestors[last1] == frame2Ancestors[last2]) {
last1--;
last2--;
}
if (last1 < 0) {
if (last2 < 0) {
NS_ASSERTION(aFrame1 == aFrame2, "internal error?");
return 0;
}
// aFrame1 is an ancestor of aFrame2
return aIf1Ancestor;
}
if (last2 < 0) {
// aFrame2 is an ancestor of aFrame1
return aIf2Ancestor;
}
nsIFrame* ancestor1 = frame1Ancestors[last1];
nsIFrame* ancestor2 = frame2Ancestors[last2];
// Now we should be able to walk sibling chains to find which one is first
if (IsFrameAfter(ancestor2, ancestor1))
return -1;
if (IsFrameAfter(ancestor1, ancestor2))
return 1;
NS_WARNING("Frames were in different child lists???");
return 0;
}
// static
nsIFrame* nsLayoutUtils::GetLastSibling(nsIFrame* aFrame) {
if (!aFrame) {
return nullptr;
}
nsIFrame* next;
while ((next = aFrame->GetNextSibling()) != nullptr) {
aFrame = next;
}
return aFrame;
}
// static
nsView*
nsLayoutUtils::FindSiblingViewFor(nsView* aParentView, nsIFrame* aFrame) {
nsIFrame* parentViewFrame = aParentView->GetFrame();
nsIContent* parentViewContent = parentViewFrame ? parentViewFrame->GetContent() : nullptr;
for (nsView* insertBefore = aParentView->GetFirstChild(); insertBefore;
insertBefore = insertBefore->GetNextSibling()) {
nsIFrame* f = insertBefore->GetFrame();
if (!f) {
// this view could be some anonymous view attached to a meaningful parent
for (nsView* searchView = insertBefore->GetParent(); searchView;
searchView = searchView->GetParent()) {
f = searchView->GetFrame();
if (f) {
break;
}
}
NS_ASSERTION(f, "Can't find a frame anywhere!");
}
if (!f || !aFrame->GetContent() || !f->GetContent() ||
CompareTreePosition(aFrame->GetContent(), f->GetContent(), parentViewContent) > 0) {
// aFrame's content is after f's content (or we just don't know),
// so put our view before f's view
return insertBefore;
}
}
return nullptr;
}
//static
nsIScrollableFrame*
nsLayoutUtils::GetScrollableFrameFor(const nsIFrame *aScrolledFrame)
{
nsIFrame *frame = aScrolledFrame->GetParent();
if (!frame) {
return nullptr;
}
nsIScrollableFrame *sf = do_QueryFrame(frame);
return sf;
}
nsIFrame*
nsLayoutUtils::GetActiveScrolledRootFor(nsIFrame* aFrame,
const nsIFrame* aStopAtAncestor)
{
nsIFrame* f = aFrame;
while (f != aStopAtAncestor) {
if (IsPopup(f))
break;
nsIFrame* parent = GetCrossDocParentFrame(f);
if (!parent)
break;
nsIScrollableFrame* sf = do_QueryFrame(parent);
if (sf && sf->IsScrollingActive() && sf->GetScrolledFrame() == f)
break;
f = parent;
}
return f;
}
nsIFrame*
nsLayoutUtils::GetActiveScrolledRootFor(nsDisplayItem* aItem,
nsDisplayListBuilder* aBuilder,
bool* aShouldFixToViewport)
{
nsIFrame* f = aItem->Frame();
if (aShouldFixToViewport) {
*aShouldFixToViewport = false;
}
if (aItem->ShouldFixToViewport(aBuilder)) {
if (aShouldFixToViewport) {
*aShouldFixToViewport = true;
}
// Make its active scrolled root be the active scrolled root of
// the enclosing viewport, since it shouldn't be scrolled by scrolled
// frames in its document. InvalidateFixedBackgroundFramesFromList in
// nsGfxScrollFrame will not repaint this item when scrolling occurs.
nsIFrame* viewportFrame =
nsLayoutUtils::GetClosestFrameOfType(f, nsGkAtoms::viewportFrame);
NS_ASSERTION(viewportFrame, "no viewport???");
return nsLayoutUtils::GetActiveScrolledRootFor(viewportFrame, aBuilder->FindReferenceFrameFor(viewportFrame));
} else {
return nsLayoutUtils::GetActiveScrolledRootFor(f, aItem->ReferenceFrame());
}
}
bool
nsLayoutUtils::IsScrolledByRootContentDocumentDisplayportScrolling(const nsIFrame* aActiveScrolledRoot,
nsDisplayListBuilder* aBuilder)
{
nsPresContext* presContext = aActiveScrolledRoot->PresContext()->
GetToplevelContentDocumentPresContext();
if (!presContext)
return false;
nsIFrame* rootScrollFrame = presContext->GetPresShell()->GetRootScrollFrame();
if (!rootScrollFrame || !nsLayoutUtils::GetDisplayPort(rootScrollFrame->GetContent(), nullptr))
return false;
return nsLayoutUtils::IsAncestorFrameCrossDoc(rootScrollFrame, aActiveScrolledRoot);
}
// static
nsIScrollableFrame*
nsLayoutUtils::GetNearestScrollableFrameForDirection(nsIFrame* aFrame,
Direction aDirection)
{
NS_ASSERTION(aFrame, "GetNearestScrollableFrameForDirection expects a non-null frame");
for (nsIFrame* f = aFrame; f; f = nsLayoutUtils::GetCrossDocParentFrame(f)) {
nsIScrollableFrame* scrollableFrame = do_QueryFrame(f);
if (scrollableFrame) {
nsPresContext::ScrollbarStyles ss = scrollableFrame->GetScrollbarStyles();
uint32_t directions = scrollableFrame->GetPerceivedScrollingDirections();
if (aDirection == eVertical ?
(ss.mVertical != NS_STYLE_OVERFLOW_HIDDEN &&
(directions & nsIScrollableFrame::VERTICAL)) :
(ss.mHorizontal != NS_STYLE_OVERFLOW_HIDDEN &&
(directions & nsIScrollableFrame::HORIZONTAL)))
return scrollableFrame;
}
}
return nullptr;
}
// static
nsIScrollableFrame*
nsLayoutUtils::GetNearestScrollableFrame(nsIFrame* aFrame)
{
NS_ASSERTION(aFrame, "GetNearestScrollableFrame expects a non-null frame");
for (nsIFrame* f = aFrame; f; f = nsLayoutUtils::GetCrossDocParentFrame(f)) {
nsIScrollableFrame* scrollableFrame = do_QueryFrame(f);
if (scrollableFrame) {
nsPresContext::ScrollbarStyles ss = scrollableFrame->GetScrollbarStyles();
if (ss.mVertical != NS_STYLE_OVERFLOW_HIDDEN ||
ss.mHorizontal != NS_STYLE_OVERFLOW_HIDDEN)
return scrollableFrame;
}
}
return nullptr;
}
// static
nsRect
nsLayoutUtils::GetScrolledRect(nsIFrame* aScrolledFrame,
const nsRect& aScrolledFrameOverflowArea,
const nsSize& aScrollPortSize,
uint8_t aDirection)
{
nscoord x1 = aScrolledFrameOverflowArea.x,
x2 = aScrolledFrameOverflowArea.XMost(),
y1 = aScrolledFrameOverflowArea.y,
y2 = aScrolledFrameOverflowArea.YMost();
if (y1 < 0) {
y1 = 0;
}
if (aDirection != NS_STYLE_DIRECTION_RTL) {
if (x1 < 0) {
x1 = 0;
}
} else {
if (x2 > aScrollPortSize.width) {
x2 = aScrollPortSize.width;
}
// When the scrolled frame chooses a size larger than its available width (because
// its padding alone is larger than the available width), we need to keep the
// start-edge of the scroll frame anchored to the start-edge of the scrollport.
// When the scrolled frame is RTL, this means moving it in our left-based
// coordinate system, so we need to compensate for its extra width here by
// effectively repositioning the frame.
nscoord extraWidth = std::max(0, aScrolledFrame->GetSize().width - aScrollPortSize.width);
x2 += extraWidth;
}
return nsRect(x1, y1, x2 - x1, y2 - y1);
}
//static
bool
nsLayoutUtils::HasPseudoStyle(nsIContent* aContent,
nsStyleContext* aStyleContext,
nsCSSPseudoElements::Type aPseudoElement,
nsPresContext* aPresContext)
{
NS_PRECONDITION(aPresContext, "Must have a prescontext");
nsRefPtr<nsStyleContext> pseudoContext;
if (aContent) {
pseudoContext = aPresContext->StyleSet()->
ProbePseudoElementStyle(aContent->AsElement(), aPseudoElement,
aStyleContext);
}
return pseudoContext != nullptr;
}
nsPoint
nsLayoutUtils::GetDOMEventCoordinatesRelativeTo(nsIDOMEvent* aDOMEvent, nsIFrame* aFrame)
{
if (!aDOMEvent)
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
nsEvent *event = aDOMEvent->GetInternalNSEvent();
if (!event)
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
return GetEventCoordinatesRelativeTo(event, aFrame);
}
nsPoint
nsLayoutUtils::GetEventCoordinatesRelativeTo(const nsEvent* aEvent, nsIFrame* aFrame)
{
if (!aEvent || (aEvent->eventStructType != NS_MOUSE_EVENT &&
aEvent->eventStructType != NS_MOUSE_SCROLL_EVENT &&
aEvent->eventStructType != NS_WHEEL_EVENT &&
aEvent->eventStructType != NS_DRAG_EVENT &&
aEvent->eventStructType != NS_SIMPLE_GESTURE_EVENT &&
aEvent->eventStructType != NS_GESTURENOTIFY_EVENT &&
aEvent->eventStructType != NS_TOUCH_EVENT &&
aEvent->eventStructType != NS_QUERY_CONTENT_EVENT))
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
const nsGUIEvent* GUIEvent = static_cast<const nsGUIEvent*>(aEvent);
return GetEventCoordinatesRelativeTo(aEvent,
GUIEvent->refPoint,
aFrame);
}
nsPoint
nsLayoutUtils::GetEventCoordinatesRelativeTo(const nsEvent* aEvent,
const nsIntPoint aPoint,
nsIFrame* aFrame)
{
if (!aFrame) {
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
}
const nsGUIEvent* GUIEvent = static_cast<const nsGUIEvent*>(aEvent);
nsIWidget* widget = GUIEvent->widget;
if (!widget) {
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
}
return GetEventCoordinatesRelativeTo(widget, aPoint, aFrame);
}
nsPoint
nsLayoutUtils::GetEventCoordinatesRelativeTo(nsIWidget* aWidget,
const nsIntPoint aPoint,
nsIFrame* aFrame)
{
if (!aFrame || !aWidget) {
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
}
nsView* view = aFrame->GetView();
if (view) {
nsIWidget* frameWidget = view->GetWidget();
if (frameWidget && frameWidget == aWidget) {
// Special case this cause it happens a lot.
// This also fixes bug 664707, events in the extra-special case of select
// dropdown popups that are transformed.
nsPresContext* presContext = aFrame->PresContext();
nsPoint pt(presContext->DevPixelsToAppUnits(aPoint.x),
presContext->DevPixelsToAppUnits(aPoint.y));
return pt - view->ViewToWidgetOffset();
}
}
/* If we walk up the frame tree and discover that any of the frames are
* transformed, we need to do extra work to convert from the global
* space to the local space.
*/
nsIFrame* rootFrame = aFrame;
bool transformFound = false;
for (nsIFrame* f = aFrame; f; f = GetCrossDocParentFrame(f)) {
if (f->IsTransformed()) {
transformFound = true;
}
rootFrame = f;
}
nsView* rootView = rootFrame->GetView();
if (!rootView) {
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
}
nsPoint widgetToView = TranslateWidgetToView(rootFrame->PresContext(),
aWidget, aPoint, rootView);
if (widgetToView == nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE)) {
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
}
// Convert from root document app units to app units of the document aFrame
// is in.
int32_t rootAPD = rootFrame->PresContext()->AppUnitsPerDevPixel();
int32_t localAPD = aFrame->PresContext()->AppUnitsPerDevPixel();
widgetToView = widgetToView.ConvertAppUnits(rootAPD, localAPD);
/* If we encountered a transform, we can't do simple arithmetic to figure
* out how to convert back to aFrame's coordinates and must use the CTM.
*/
if (transformFound || aFrame->IsSVGText()) {
return TransformRootPointToFrame(aFrame, widgetToView);
}
/* Otherwise, all coordinate systems are translations of one another,
* so we can just subtract out the difference.
*/
return widgetToView - aFrame->GetOffsetToCrossDoc(rootFrame);
}
nsIFrame*
nsLayoutUtils::GetPopupFrameForEventCoordinates(nsPresContext* aPresContext,
const nsEvent* aEvent)
{
#ifdef MOZ_XUL
nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
if (!pm) {
return nullptr;
}
nsTArray<nsIFrame*> popups;
pm->GetVisiblePopups(popups);
uint32_t i;
// Search from top to bottom
for (i = 0; i < popups.Length(); i++) {
nsIFrame* popup = popups[i];
if (popup->PresContext()->GetRootPresContext() == aPresContext &&
popup->GetScrollableOverflowRect().Contains(
GetEventCoordinatesRelativeTo(aEvent, popup))) {
return popup;
}
}
#endif
return nullptr;
}
gfx3DMatrix
nsLayoutUtils::ChangeMatrixBasis(const gfxPoint3D &aOrigin,
const gfx3DMatrix &aMatrix)
{
gfx3DMatrix result = aMatrix;
/* Translate to the origin before aMatrix */
result.Translate(-aOrigin);
/* Translate back into position after aMatrix */
result.TranslatePost(aOrigin);
return result;
}
/**
* Given a gfxFloat, constrains its value to be between nscoord_MIN and nscoord_MAX.
*
* @param aVal The value to constrain (in/out)
*/
static void ConstrainToCoordValues(gfxFloat &aVal)
{
if (aVal <= nscoord_MIN)
aVal = nscoord_MIN;
else if (aVal >= nscoord_MAX)
aVal = nscoord_MAX;
}
nsRect
nsLayoutUtils::RoundGfxRectToAppRect(const gfxRect &aRect, float aFactor)
{
/* Get a new gfxRect whose units are app units by scaling by the specified factor. */
gfxRect scaledRect = aRect;
scaledRect.ScaleRoundOut(aFactor);
/* We now need to constrain our results to the max and min values for coords. */
ConstrainToCoordValues(scaledRect.x);
ConstrainToCoordValues(scaledRect.y);
ConstrainToCoordValues(scaledRect.width);
ConstrainToCoordValues(scaledRect.height);
/* Now typecast everything back. This is guaranteed to be safe. */
return nsRect(nscoord(scaledRect.X()), nscoord(scaledRect.Y()),
nscoord(scaledRect.Width()), nscoord(scaledRect.Height()));
}
nsRegion
nsLayoutUtils::RoundedRectIntersectRect(const nsRect& aRoundedRect,
const nscoord aRadii[8],
const nsRect& aContainedRect)
{
// rectFullHeight and rectFullWidth together will approximately contain
// the total area of the frame minus the rounded corners.
nsRect rectFullHeight = aRoundedRect;
nscoord xDiff = std::max(aRadii[NS_CORNER_TOP_LEFT_X], aRadii[NS_CORNER_BOTTOM_LEFT_X]);
rectFullHeight.x += xDiff;
rectFullHeight.width -= std::max(aRadii[NS_CORNER_TOP_RIGHT_X],
aRadii[NS_CORNER_BOTTOM_RIGHT_X]) + xDiff;
nsRect r1;
r1.IntersectRect(rectFullHeight, aContainedRect);
nsRect rectFullWidth = aRoundedRect;
nscoord yDiff = std::max(aRadii[NS_CORNER_TOP_LEFT_Y], aRadii[NS_CORNER_TOP_RIGHT_Y]);
rectFullWidth.y += yDiff;
rectFullWidth.height -= std::max(aRadii[NS_CORNER_BOTTOM_LEFT_Y],
aRadii[NS_CORNER_BOTTOM_RIGHT_Y]) + yDiff;
nsRect r2;
r2.IntersectRect(rectFullWidth, aContainedRect);
nsRegion result;
result.Or(r1, r2);
return result;
}
// Helper for RoundedRectIntersectsRect.
static bool
CheckCorner(nscoord aXOffset, nscoord aYOffset,
nscoord aXRadius, nscoord aYRadius)
{
NS_ABORT_IF_FALSE(aXOffset > 0 && aYOffset > 0,
"must not pass nonpositives to CheckCorner");
NS_ABORT_IF_FALSE(aXRadius >= 0 && aYRadius >= 0,
"must not pass negatives to CheckCorner");
// Avoid floating point math unless we're either (1) within the
// quarter-ellipse area at the rounded corner or (2) outside the
// rounding.
if (aXOffset >= aXRadius || aYOffset >= aYRadius)
return true;
// Convert coordinates to a unit circle with (0,0) as the center of
// curvature, and see if we're inside the circle or outside.
float scaledX = float(aXRadius - aXOffset) / float(aXRadius);
float scaledY = float(aYRadius - aYOffset) / float(aYRadius);
return scaledX * scaledX + scaledY * scaledY < 1.0f;
}
bool
nsLayoutUtils::RoundedRectIntersectsRect(const nsRect& aRoundedRect,
const nscoord aRadii[8],
const nsRect& aTestRect)
{
if (!aTestRect.Intersects(aRoundedRect))
return false;
// distances from this edge of aRoundedRect to opposite edge of aTestRect,
// which we know are positive due to the Intersects check above.
nsMargin insets;
insets.top = aTestRect.YMost() - aRoundedRect.y;
insets.right = aRoundedRect.XMost() - aTestRect.x;
insets.bottom = aRoundedRect.YMost() - aTestRect.y;
insets.left = aTestRect.XMost() - aRoundedRect.x;
// Check whether the bottom-right corner of aTestRect is inside the
// top left corner of aBounds when rounded by aRadii, etc. If any
// corner is not, then fail; otherwise succeed.
return CheckCorner(insets.left, insets.top,
aRadii[NS_CORNER_TOP_LEFT_X],
aRadii[NS_CORNER_TOP_LEFT_Y]) &&
CheckCorner(insets.right, insets.top,
aRadii[NS_CORNER_TOP_RIGHT_X],
aRadii[NS_CORNER_TOP_RIGHT_Y]) &&
CheckCorner(insets.right, insets.bottom,
aRadii[NS_CORNER_BOTTOM_RIGHT_X],
aRadii[NS_CORNER_BOTTOM_RIGHT_Y]) &&
CheckCorner(insets.left, insets.bottom,
aRadii[NS_CORNER_BOTTOM_LEFT_X],
aRadii[NS_CORNER_BOTTOM_LEFT_Y]);
}
nsRect
nsLayoutUtils::MatrixTransformRectOut(const nsRect &aBounds,
const gfx3DMatrix &aMatrix, float aFactor)
{
nsRect outside = aBounds;
outside.ScaleRoundOut(1/aFactor);
gfxRect image = aMatrix.TransformBounds(gfxRect(outside.x,
outside.y,
outside.width,
outside.height));
return RoundGfxRectToAppRect(image, aFactor);
}
nsRect
nsLayoutUtils::MatrixTransformRect(const nsRect &aBounds,
const gfx3DMatrix &aMatrix, float aFactor)
{
gfxRect image = aMatrix.TransformBounds(gfxRect(NSAppUnitsToDoublePixels(aBounds.x, aFactor),
NSAppUnitsToDoublePixels(aBounds.y, aFactor),
NSAppUnitsToDoublePixels(aBounds.width, aFactor),
NSAppUnitsToDoublePixels(aBounds.height, aFactor)));
return RoundGfxRectToAppRect(image, aFactor);
}
nsPoint
nsLayoutUtils::MatrixTransformPoint(const nsPoint &aPoint,
const gfx3DMatrix &aMatrix, float aFactor)
{
gfxPoint image = aMatrix.Transform(gfxPoint(NSAppUnitsToFloatPixels(aPoint.x, aFactor),
NSAppUnitsToFloatPixels(aPoint.y, aFactor)));
return nsPoint(NSFloatPixelsToAppUnits(float(image.x), aFactor),
NSFloatPixelsToAppUnits(float(image.y), aFactor));
}
gfx3DMatrix
nsLayoutUtils::GetTransformToAncestor(nsIFrame *aFrame, const nsIFrame *aAncestor)
{
nsIFrame* parent;
gfx3DMatrix ctm;
if (aFrame == aAncestor) {
return ctm;
}
ctm = aFrame->GetTransformMatrix(aAncestor, &parent);
while (parent && parent != aAncestor) {
if (!parent->Preserves3DChildren()) {
ctm.ProjectTo2D();
}
ctm = ctm * parent->GetTransformMatrix(aAncestor, &parent);
}
return ctm;
}
bool
nsLayoutUtils::GetLayerTransformForFrame(nsIFrame* aFrame,
gfx3DMatrix* aTransform)
{
// FIXME/bug 796690: we can sometimes compute a transform in these
// cases, it just increases complexity considerably. Punt for now.
if (aFrame->Preserves3DChildren() || aFrame->HasTransformGetter()) {
return false;
}
nsIFrame* root = nsLayoutUtils::GetDisplayRootFrame(aFrame);
if (root->HasAnyStateBits(NS_FRAME_UPDATE_LAYER_TREE)) {
// Content may have been invalidated, so we can't reliably compute
// the "layer transform" in general.
return false;
}
// If the caller doesn't care about the value, early-return to skip
// overhead below.
if (!aTransform) {
return true;
}
nsDisplayListBuilder builder(root, nsDisplayListBuilder::OTHER,
false/*don't build caret*/);
nsDisplayList list;
nsDisplayTransform* item =
new (&builder) nsDisplayTransform(&builder, aFrame, &list);
*aTransform =
item->GetTransform(aFrame->PresContext()->AppUnitsPerDevPixel());
item->~nsDisplayTransform();
return true;
}
static gfxPoint
TransformGfxPointFromAncestor(nsIFrame *aFrame,
const gfxPoint &aPoint,
nsIFrame *aAncestor)
{
gfx3DMatrix ctm = nsLayoutUtils::GetTransformToAncestor(aFrame, aAncestor);
return ctm.Inverse().ProjectPoint(aPoint);
}
static gfxRect
TransformGfxRectFromAncestor(nsIFrame *aFrame,
const gfxRect &aRect,
const nsIFrame *aAncestor)
{
gfx3DMatrix ctm = nsLayoutUtils::GetTransformToAncestor(aFrame, aAncestor);
return ctm.Inverse().ProjectRectBounds(aRect);
}
static gfxRect
TransformGfxRectToAncestor(nsIFrame *aFrame,
const gfxRect &aRect,
const nsIFrame *aAncestor)
{
gfx3DMatrix ctm = nsLayoutUtils::GetTransformToAncestor(aFrame, aAncestor);
return ctm.TransformBounds(aRect);
}
static nsSVGTextFrame2*
GetContainingSVGTextFrame(nsIFrame* aFrame)
{
if (!aFrame->IsSVGText()) {
return nullptr;
}
return static_cast<nsSVGTextFrame2*>
(nsLayoutUtils::GetClosestFrameOfType(aFrame->GetParent(),
nsGkAtoms::svgTextFrame2));
}
nsPoint
nsLayoutUtils::TransformAncestorPointToFrame(nsIFrame* aFrame,
const nsPoint& aPoint,
nsIFrame* aAncestor)
{
nsSVGTextFrame2* text = GetContainingSVGTextFrame(aFrame);
float factor = aFrame->PresContext()->AppUnitsPerDevPixel();
gfxPoint result(NSAppUnitsToFloatPixels(aPoint.x, factor),
NSAppUnitsToFloatPixels(aPoint.y, factor));
if (text) {
result = TransformGfxPointFromAncestor(text, result, aAncestor);
result = text->TransformFramePointToTextChild(result, aFrame);
} else {
result = TransformGfxPointFromAncestor(aFrame, result, nullptr);
}
return nsPoint(NSFloatPixelsToAppUnits(float(result.x), factor),
NSFloatPixelsToAppUnits(float(result.y), factor));
}
nsRect
nsLayoutUtils::TransformAncestorRectToFrame(nsIFrame* aFrame,
const nsRect &aRect,
const nsIFrame* aAncestor)
{
nsSVGTextFrame2* text = GetContainingSVGTextFrame(aFrame);
float srcAppUnitsPerDevPixel = aAncestor->PresContext()->AppUnitsPerDevPixel();
gfxRect result(NSAppUnitsToFloatPixels(aRect.x, srcAppUnitsPerDevPixel),
NSAppUnitsToFloatPixels(aRect.y, srcAppUnitsPerDevPixel),
NSAppUnitsToFloatPixels(aRect.width, srcAppUnitsPerDevPixel),
NSAppUnitsToFloatPixels(aRect.height, srcAppUnitsPerDevPixel));
if (text) {
result = TransformGfxRectFromAncestor(text, result, aAncestor);
result = text->TransformFrameRectToTextChild(result, aFrame);
} else {
result = TransformGfxRectFromAncestor(aFrame, result, aAncestor);
}
float destAppUnitsPerDevPixel = aFrame->PresContext()->AppUnitsPerDevPixel();
return nsRect(NSFloatPixelsToAppUnits(float(result.x), destAppUnitsPerDevPixel),
NSFloatPixelsToAppUnits(float(result.y), destAppUnitsPerDevPixel),
NSFloatPixelsToAppUnits(float(result.width), destAppUnitsPerDevPixel),
NSFloatPixelsToAppUnits(float(result.height), destAppUnitsPerDevPixel));
}
nsRect
nsLayoutUtils::TransformFrameRectToAncestor(nsIFrame* aFrame,
const nsRect& aRect,
const nsIFrame* aAncestor)
{
nsSVGTextFrame2* text = GetContainingSVGTextFrame(aFrame);
float srcAppUnitsPerDevPixel = aFrame->PresContext()->AppUnitsPerDevPixel();
gfxRect result;
if (text) {
result = text->TransformFrameRectFromTextChild(aRect, aFrame);
result = TransformGfxRectToAncestor(text, result, aAncestor);
} else {
result = gfxRect(NSAppUnitsToFloatPixels(aRect.x, srcAppUnitsPerDevPixel),
NSAppUnitsToFloatPixels(aRect.y, srcAppUnitsPerDevPixel),
NSAppUnitsToFloatPixels(aRect.width, srcAppUnitsPerDevPixel),
NSAppUnitsToFloatPixels(aRect.height, srcAppUnitsPerDevPixel));
result = TransformGfxRectToAncestor(aFrame, result, aAncestor);
}
float destAppUnitsPerDevPixel = aAncestor->PresContext()->AppUnitsPerDevPixel();
return nsRect(NSFloatPixelsToAppUnits(float(result.x), destAppUnitsPerDevPixel),
NSFloatPixelsToAppUnits(float(result.y), destAppUnitsPerDevPixel),
NSFloatPixelsToAppUnits(float(result.width), destAppUnitsPerDevPixel),
NSFloatPixelsToAppUnits(float(result.height), destAppUnitsPerDevPixel));
}
static nsIntPoint GetWidgetOffset(nsIWidget* aWidget, nsIWidget*& aRootWidget) {
nsIntPoint offset(0, 0);
nsIWidget* parent = aWidget->GetParent();
while (parent) {
nsIntRect bounds;
aWidget->GetBounds(bounds);
offset += bounds.TopLeft();
aWidget = parent;
parent = aWidget->GetParent();
}
aRootWidget = aWidget;
return offset;
}
nsPoint
nsLayoutUtils::TranslateWidgetToView(nsPresContext* aPresContext,
nsIWidget* aWidget, nsIntPoint aPt,
nsView* aView)
{
nsPoint viewOffset;
nsIWidget* viewWidget = aView->GetNearestWidget(&viewOffset);
if (!viewWidget) {
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
}
nsIWidget* fromRoot;
nsIntPoint fromOffset = GetWidgetOffset(aWidget, fromRoot);
nsIWidget* toRoot;
nsIntPoint toOffset = GetWidgetOffset(viewWidget, toRoot);
nsIntPoint widgetPoint;
if (fromRoot == toRoot) {
widgetPoint = aPt + fromOffset - toOffset;
} else {
nsIntPoint screenPoint = aWidget->WidgetToScreenOffset();
widgetPoint = aPt + screenPoint - viewWidget->WidgetToScreenOffset();
}
nsPoint widgetAppUnits(aPresContext->DevPixelsToAppUnits(widgetPoint.x),
aPresContext->DevPixelsToAppUnits(widgetPoint.y));
return widgetAppUnits - viewOffset;
}
// Combine aNewBreakType with aOrigBreakType, but limit the break types
// to NS_STYLE_CLEAR_LEFT, RIGHT, LEFT_AND_RIGHT.
uint8_t
nsLayoutUtils::CombineBreakType(uint8_t aOrigBreakType,
uint8_t aNewBreakType)
{
uint8_t breakType = aOrigBreakType;
switch(breakType) {
case NS_STYLE_CLEAR_LEFT:
if ((NS_STYLE_CLEAR_RIGHT == aNewBreakType) ||
(NS_STYLE_CLEAR_LEFT_AND_RIGHT == aNewBreakType)) {
breakType = NS_STYLE_CLEAR_LEFT_AND_RIGHT;
}
break;
case NS_STYLE_CLEAR_RIGHT:
if ((NS_STYLE_CLEAR_LEFT == aNewBreakType) ||
(NS_STYLE_CLEAR_LEFT_AND_RIGHT == aNewBreakType)) {
breakType = NS_STYLE_CLEAR_LEFT_AND_RIGHT;
}
break;
case NS_STYLE_CLEAR_NONE:
if ((NS_STYLE_CLEAR_LEFT == aNewBreakType) ||
(NS_STYLE_CLEAR_RIGHT == aNewBreakType) ||
(NS_STYLE_CLEAR_LEFT_AND_RIGHT == aNewBreakType)) {
breakType = aNewBreakType;
}
}
return breakType;
}
#ifdef MOZ_DUMP_PAINTING
#include <stdio.h>
static bool gDumpEventList = false;
int gPaintCount = 0;
#endif
nsresult
nsLayoutUtils::GetRemoteContentIds(nsIFrame* aFrame,
const nsRect& aTarget,
nsTArray<ViewID> &aOutIDs,
bool aIgnoreRootScrollFrame)
{
nsDisplayListBuilder builder(aFrame, nsDisplayListBuilder::EVENT_DELIVERY,
false);
nsDisplayList list;
if (aIgnoreRootScrollFrame) {
nsIFrame* rootScrollFrame =
aFrame->PresContext()->PresShell()->GetRootScrollFrame();
if (rootScrollFrame) {
builder.SetIgnoreScrollFrame(rootScrollFrame);
}
}
builder.EnterPresShell(aFrame, aTarget);
aFrame->BuildDisplayListForStackingContext(&builder, aTarget, &list);
builder.LeavePresShell(aFrame, aTarget);
nsAutoTArray<nsIFrame*,8> outFrames;
nsDisplayItem::HitTestState hitTestState(&aOutIDs);
list.HitTest(&builder, aTarget, &hitTestState, &outFrames);
list.DeleteAll();
return NS_OK;
}
nsIFrame*
nsLayoutUtils::GetFrameForPoint(nsIFrame* aFrame, nsPoint aPt,
bool aShouldIgnoreSuppression,
bool aIgnoreRootScrollFrame)
{
PROFILER_LABEL("nsLayoutUtils", "GetFrameForPoint");
nsresult rv;
nsAutoTArray<nsIFrame*,8> outFrames;
rv = GetFramesForArea(aFrame, nsRect(aPt, nsSize(1, 1)), outFrames,
aShouldIgnoreSuppression, aIgnoreRootScrollFrame);
NS_ENSURE_SUCCESS(rv, nullptr);
return outFrames.Length() ? outFrames.ElementAt(0) : nullptr;
}
nsresult
nsLayoutUtils::GetFramesForArea(nsIFrame* aFrame, const nsRect& aRect,
nsTArray<nsIFrame*> &aOutFrames,
bool aShouldIgnoreSuppression,
bool aIgnoreRootScrollFrame)
{
PROFILER_LABEL("nsLayoutUtils","GetFramesForArea");
nsDisplayListBuilder builder(aFrame, nsDisplayListBuilder::EVENT_DELIVERY,
false);
nsDisplayList list;
nsRect target(aRect);
if (aShouldIgnoreSuppression) {
builder.IgnorePaintSuppression();
}
if (aIgnoreRootScrollFrame) {
nsIFrame* rootScrollFrame =
aFrame->PresContext()->PresShell()->GetRootScrollFrame();
if (rootScrollFrame) {
builder.SetIgnoreScrollFrame(rootScrollFrame);
}
}
builder.EnterPresShell(aFrame, target);
aFrame->BuildDisplayListForStackingContext(&builder, target, &list);
builder.LeavePresShell(aFrame, target);
#ifdef MOZ_DUMP_PAINTING
if (gDumpEventList) {
fprintf(stdout, "Event handling --- (%d,%d):\n", aRect.x, aRect.y);
nsFrame::PrintDisplayList(&builder, list);
}
#endif
nsDisplayItem::HitTestState hitTestState;
list.HitTest(&builder, target, &hitTestState, &aOutFrames);
list.DeleteAll();
return NS_OK;
}
nsresult
nsLayoutUtils::PaintFrame(nsRenderingContext* aRenderingContext, nsIFrame* aFrame,
const nsRegion& aDirtyRegion, nscolor aBackstop,
uint32_t aFlags)
{
PROFILER_LABEL("nsLayoutUtils","PaintFrame");
if (aFlags & PAINT_WIDGET_LAYERS) {
nsView* view = aFrame->GetView();
if (!(view && view->GetWidget() && GetDisplayRootFrame(aFrame) == aFrame)) {
aFlags &= ~PAINT_WIDGET_LAYERS;
NS_ASSERTION(aRenderingContext, "need a rendering context");
}
}
nsPresContext* presContext = aFrame->PresContext();
nsIPresShell* presShell = presContext->PresShell();
nsRootPresContext* rootPresContext = presContext->GetRootPresContext();
if (!rootPresContext) {
return NS_OK;
}
nsIFrame* rootScrollFrame = presShell->GetRootScrollFrame();
bool usingDisplayPort = false;
nsRect displayport;
if (rootScrollFrame) {
nsIContent* content = rootScrollFrame->GetContent();
if (content) {
usingDisplayPort = nsLayoutUtils::GetDisplayPort(content, &displayport);
}
}
bool ignoreViewportScrolling = presShell->IgnoringViewportScrolling();
nsRegion visibleRegion;
if (aFlags & PAINT_WIDGET_LAYERS) {
// This layer tree will be reused, so we'll need to calculate it
// for the whole "visible" area of the window
//
// |ignoreViewportScrolling| and |usingDisplayPort| are persistent
// document-rendering state. We rely on PresShell to flush
// retained layers as needed when that persistent state changes.
if (!usingDisplayPort) {
visibleRegion = aFrame->GetVisualOverflowRectRelativeToSelf();
} else {
visibleRegion = displayport;
}
} else {
visibleRegion = aDirtyRegion;
}
// If we're going to display something different from what we'd normally
// paint in a window then we will flush out any retained layer trees before
// *and after* we draw.
bool willFlushRetainedLayers = (aFlags & PAINT_HIDE_CARET) != 0;
nsDisplayListBuilder builder(aFrame, nsDisplayListBuilder::PAINTING,
!(aFlags & PAINT_HIDE_CARET));
if (usingDisplayPort) {
builder.SetDisplayPort(displayport);
}
nsDisplayList list;
if (aFlags & PAINT_IN_TRANSFORM) {
builder.SetInTransform(true);
}
if (aFlags & PAINT_SYNC_DECODE_IMAGES) {
builder.SetSyncDecodeImages(true);
}
if (aFlags & (PAINT_WIDGET_LAYERS | PAINT_TO_WINDOW)) {
builder.SetPaintingToWindow(true);
}
if (aFlags & PAINT_IGNORE_SUPPRESSION) {
builder.IgnorePaintSuppression();
}
// Windowed plugins aren't allowed in popups
if ((aFlags & PAINT_WIDGET_LAYERS) &&
!willFlushRetainedLayers &&
!(aFlags & PAINT_DOCUMENT_RELATIVE) &&
rootPresContext->NeedToComputePluginGeometryUpdates()) {
builder.SetWillComputePluginGeometry(true);
}
nsRect canvasArea(nsPoint(0, 0), aFrame->GetSize());
#ifdef DEBUG
if (ignoreViewportScrolling) {
nsIDocument* doc = aFrame->GetContent() ?
aFrame->GetContent()->GetCurrentDoc() : nullptr;
NS_ASSERTION(!aFrame->GetParent() ||
(doc && doc->IsBeingUsedAsImage()),
"Only expecting ignoreViewportScrolling for root frames and "
"for image documents.");
}
#endif
if (ignoreViewportScrolling && !aFrame->GetParent()) {
nsIFrame* rootScrollFrame = presShell->GetRootScrollFrame();
if (rootScrollFrame) {
nsIScrollableFrame* rootScrollableFrame =
presShell->GetRootScrollFrameAsScrollable();
if (aFlags & PAINT_DOCUMENT_RELATIVE) {
// Make visibleRegion and aRenderingContext relative to the
// scrolled frame instead of the root frame.
nsPoint pos = rootScrollableFrame->GetScrollPosition();
visibleRegion.MoveBy(-pos);
if (aRenderingContext) {
aRenderingContext->Translate(pos);
}
}
builder.SetIgnoreScrollFrame(rootScrollFrame);
nsCanvasFrame* canvasFrame =
do_QueryFrame(rootScrollableFrame->GetScrolledFrame());
if (canvasFrame) {
// Use UnionRect here to ensure that areas where the scrollbars
// were are still filled with the background color.
canvasArea.UnionRect(canvasArea,
canvasFrame->CanvasArea() + builder.ToReferenceFrame(canvasFrame));
}
}
}
nsRect dirtyRect = visibleRegion.GetBounds();
builder.EnterPresShell(aFrame, dirtyRect);
{
PROFILER_LABEL("nsLayoutUtils","PaintFrame::BuildDisplayList");
aFrame->BuildDisplayListForStackingContext(&builder, dirtyRect, &list);
}
const bool paintAllContinuations = aFlags & PAINT_ALL_CONTINUATIONS;
NS_ASSERTION(!paintAllContinuations || !aFrame->GetPrevContinuation(),
"If painting all continuations, the frame must be "
"first-continuation");
nsIAtom* frameType = aFrame->GetType();
if (paintAllContinuations) {
nsIFrame* currentFrame = aFrame;
while ((currentFrame = currentFrame->GetNextContinuation()) != nullptr) {
PROFILER_LABEL("nsLayoutUtils","PaintFrame::ContinuationsBuildDisplayList");
nsRect frameDirty = dirtyRect - builder.ToReferenceFrame(currentFrame);
currentFrame->BuildDisplayListForStackingContext(&builder,
frameDirty, &list);
}
}
// For the viewport frame in print preview/page layout we want to paint
// the grey background behind the page, not the canvas color.
if (frameType == nsGkAtoms::viewportFrame &&
nsLayoutUtils::NeedsPrintPreviewBackground(presContext)) {
nsRect bounds = nsRect(builder.ToReferenceFrame(aFrame),
aFrame->GetSize());
presShell->AddPrintPreviewBackgroundItem(builder, list, aFrame, bounds);
} else if (frameType != nsGkAtoms::pageFrame) {
// For printing, this function is first called on an nsPageFrame, which
// creates a display list with a PageContent item. The PageContent item's
// paint function calls this function on the nsPageFrame's child which is
// an nsPageContentFrame. We only want to add the canvas background color
// item once, for the nsPageContentFrame.
// Add the canvas background color to the bottom of the list. This
// happens after we've built the list so that AddCanvasBackgroundColorItem
// can monkey with the contents if necessary.
canvasArea.IntersectRect(canvasArea, visibleRegion.GetBounds());
presShell->AddCanvasBackgroundColorItem(
builder, list, aFrame, canvasArea, aBackstop);
// If the passed in backstop color makes us draw something different from
// normal, we need to flush layers.
if ((aFlags & PAINT_WIDGET_LAYERS) && !willFlushRetainedLayers) {
nsView* view = aFrame->GetView();
if (view) {
nscolor backstop = presShell->ComputeBackstopColor(view);
// The PresShell's canvas background color doesn't get updated until
// EnterPresShell, so this check has to be done after that.
nscolor canvasColor = presShell->GetCanvasBackground();
if (NS_ComposeColors(aBackstop, canvasColor) !=
NS_ComposeColors(backstop, canvasColor)) {
willFlushRetainedLayers = true;
}
}
}
}
builder.LeavePresShell(aFrame, dirtyRect);
if (builder.GetHadToIgnorePaintSuppression()) {
willFlushRetainedLayers = true;
}
#ifdef MOZ_DUMP_PAINTING
FILE* savedDumpFile = gfxUtils::sDumpPaintFile;
if (gfxUtils::sDumpPaintList || gfxUtils::sDumpPainting) {
if (gfxUtils::sDumpPaintingToFile) {
nsCString string("dump-");
string.AppendInt(gPaintCount);
string.Append(".html");
gfxUtils::sDumpPaintFile = fopen(string.BeginReading(), "w");
} else {
gfxUtils::sDumpPaintFile = stdout;
}
if (gfxUtils::sDumpPaintingToFile) {
fprintf(gfxUtils::sDumpPaintFile, "<html><head><script>var array = {}; function ViewImage(index) { window.location = array[index]; }</script></head><body>");
}
fprintf(gfxUtils::sDumpPaintFile, "Painting --- before optimization (dirty %d,%d,%d,%d):\n",
dirtyRect.x, dirtyRect.y, dirtyRect.width, dirtyRect.height);
nsFrame::PrintDisplayList(&builder, list, gfxUtils::sDumpPaintFile, gfxUtils::sDumpPaintingToFile);
if (gfxUtils::sDumpPaintingToFile) {
fprintf(gfxUtils::sDumpPaintFile, "<script>");
}
}
#endif
list.ComputeVisibilityForRoot(&builder, &visibleRegion);
uint32_t flags = nsDisplayList::PAINT_DEFAULT;
if (aFlags & PAINT_WIDGET_LAYERS) {
flags |= nsDisplayList::PAINT_USE_WIDGET_LAYERS;
if (willFlushRetainedLayers) {
// The caller wanted to paint from retained layers, but set up
// the paint in such a way that we can't use them. We're going
// to display something different from what we'd normally paint
// in a window, so make sure we flush out any retained layer
// trees before *and after* we draw. Callers should be fixed to
// not do this.
NS_WARNING("Flushing retained layers!");
flags |= nsDisplayList::PAINT_FLUSH_LAYERS;
} else if (!(aFlags & PAINT_DOCUMENT_RELATIVE)) {
nsIWidget *widget = aFrame->GetNearestWidget();
if (widget) {
builder.SetFinalTransparentRegion(visibleRegion);
// If we're finished building display list items for painting of the outermost
// pres shell, notify the widget about any toolbars we've encountered.
widget->UpdateThemeGeometries(builder.GetThemeGeometries());
}
}
}
if (aFlags & PAINT_EXISTING_TRANSACTION) {
flags |= nsDisplayList::PAINT_EXISTING_TRANSACTION;
}
if (aFlags & PAINT_NO_COMPOSITE) {
flags |= nsDisplayList::PAINT_NO_COMPOSITE;
}
list.PaintRoot(&builder, aRenderingContext, flags);
#ifdef MOZ_DUMP_PAINTING
if (gfxUtils::sDumpPaintList || gfxUtils::sDumpPainting) {
if (gfxUtils::sDumpPaintingToFile) {
fprintf(gfxUtils::sDumpPaintFile, "</script>");
}
fprintf(gfxUtils::sDumpPaintFile, "Painting --- after optimization:\n");
nsFrame::PrintDisplayList(&builder, list, gfxUtils::sDumpPaintFile, gfxUtils::sDumpPaintingToFile);
fprintf(gfxUtils::sDumpPaintFile, "Painting --- retained layer tree:\n");
nsIWidget* widget = aFrame->GetNearestWidget();
if (widget) {
nsRefPtr<LayerManager> layerManager = widget->GetLayerManager();
if (layerManager) {
FrameLayerBuilder::DumpRetainedLayerTree(layerManager, gfxUtils::sDumpPaintFile,
gfxUtils::sDumpPaintingToFile);
}
}
if (gfxUtils::sDumpPaintingToFile) {
fprintf(gfxUtils::sDumpPaintFile, "</body></html>");
fclose(gfxUtils::sDumpPaintFile);
}
gfxUtils::sDumpPaintFile = savedDumpFile;
gPaintCount++;
}
#endif
// Update the widget's opaque region information. This sets
// glass boundaries on Windows. Also set up plugin clip regions and bounds.
if ((aFlags & PAINT_WIDGET_LAYERS) &&
!willFlushRetainedLayers &&
!(aFlags & PAINT_DOCUMENT_RELATIVE)) {
nsIWidget *widget = aFrame->GetNearestWidget();
if (widget) {
nsRegion excludedRegion = builder.GetExcludedGlassRegion();
excludedRegion.Sub(excludedRegion, visibleRegion);
nsIntRegion windowRegion(excludedRegion.ToNearestPixels(presContext->AppUnitsPerDevPixel()));
widget->UpdateOpaqueRegion(windowRegion);
}
}
if (builder.WillComputePluginGeometry()) {
rootPresContext->ComputePluginGeometryUpdates(aFrame, &builder, &list);
}
// Flush the list so we don't trigger the IsEmpty-on-destruction assertion
list.DeleteAll();
return NS_OK;
}
int32_t
nsLayoutUtils::GetZIndex(nsIFrame* aFrame) {
if (!aFrame->IsPositioned() && !aFrame->IsFlexItem())
return 0;
const nsStylePosition* position =
aFrame->StylePosition();
if (position->mZIndex.GetUnit() == eStyleUnit_Integer)
return position->mZIndex.GetIntValue();
// sort the auto and 0 elements together
return 0;
}
/**
* Uses a binary search for find where the cursor falls in the line of text
* It also keeps track of the part of the string that has already been measured
* so it doesn't have to keep measuring the same text over and over
*
* @param "aBaseWidth" contains the width in twips of the portion
* of the text that has already been measured, and aBaseInx contains
* the index of the text that has already been measured.
*
* @param aTextWidth returns the (in twips) the length of the text that falls
* before the cursor aIndex contains the index of the text where the cursor falls
*/
bool
nsLayoutUtils::BinarySearchForPosition(nsRenderingContext* aRendContext,
const PRUnichar* aText,
int32_t aBaseWidth,
int32_t aBaseInx,
int32_t aStartInx,
int32_t aEndInx,
int32_t aCursorPos,
int32_t& aIndex,
int32_t& aTextWidth)
{
int32_t range = aEndInx - aStartInx;
if ((range == 1) || (range == 2 && NS_IS_HIGH_SURROGATE(aText[aStartInx]))) {
aIndex = aStartInx + aBaseInx;
aTextWidth = aRendContext->GetWidth(aText, aIndex);
return true;
}
int32_t inx = aStartInx + (range / 2);
// Make sure we don't leave a dangling low surrogate
if (NS_IS_HIGH_SURROGATE(aText[inx-1]))
inx++;
int32_t textWidth = aRendContext->GetWidth(aText, inx);
int32_t fullWidth = aBaseWidth + textWidth;
if (fullWidth == aCursorPos) {
aTextWidth = textWidth;
aIndex = inx;
return true;
} else if (aCursorPos < fullWidth) {
aTextWidth = aBaseWidth;
if (BinarySearchForPosition(aRendContext, aText, aBaseWidth, aBaseInx, aStartInx, inx, aCursorPos, aIndex, aTextWidth)) {
return true;
}
} else {
aTextWidth = fullWidth;
if (BinarySearchForPosition(aRendContext, aText, aBaseWidth, aBaseInx, inx, aEndInx, aCursorPos, aIndex, aTextWidth)) {
return true;
}
}
return false;
}
static void
AddBoxesForFrame(nsIFrame* aFrame,
nsLayoutUtils::BoxCallback* aCallback)
{
nsIAtom* pseudoType = aFrame->StyleContext()->GetPseudo();
if (pseudoType == nsCSSAnonBoxes::tableOuter) {
AddBoxesForFrame(aFrame->GetFirstPrincipalChild(), aCallback);
nsIFrame* kid = aFrame->GetFirstChild(nsIFrame::kCaptionList);
if (kid) {
AddBoxesForFrame(kid, aCallback);
}
} else if (pseudoType == nsCSSAnonBoxes::mozAnonymousBlock ||
pseudoType == nsCSSAnonBoxes::mozAnonymousPositionedBlock ||
pseudoType == nsCSSAnonBoxes::mozMathMLAnonymousBlock ||
pseudoType == nsCSSAnonBoxes::mozXULAnonymousBlock) {
for (nsIFrame* kid = aFrame->GetFirstPrincipalChild(); kid; kid = kid->GetNextSibling()) {
AddBoxesForFrame(kid, aCallback);
}
} else {
aCallback->AddBox(aFrame);
}
}
void
nsLayoutUtils::GetAllInFlowBoxes(nsIFrame* aFrame, BoxCallback* aCallback)
{
while (aFrame) {
AddBoxesForFrame(aFrame, aCallback);
aFrame = nsLayoutUtils::GetNextContinuationOrSpecialSibling(aFrame);
}
}
struct BoxToRect : public nsLayoutUtils::BoxCallback {
typedef nsSize (*GetRectFromFrameFun)(nsIFrame*);
nsIFrame* mRelativeTo;
nsLayoutUtils::RectCallback* mCallback;
uint32_t mFlags;
GetRectFromFrameFun mRectFromFrame;
BoxToRect(nsIFrame* aRelativeTo, nsLayoutUtils::RectCallback* aCallback,
uint32_t aFlags, GetRectFromFrameFun aRectFromFrame)
: mRelativeTo(aRelativeTo), mCallback(aCallback), mFlags(aFlags),
mRectFromFrame(aRectFromFrame) {}
virtual void AddBox(nsIFrame* aFrame) {
nsRect r;
nsIFrame* outer = nsSVGUtils::GetOuterSVGFrameAndCoveredRegion(aFrame, &r);
if (!outer) {
outer = aFrame;
r = nsRect(nsPoint(0, 0), mRectFromFrame(aFrame));
}
if (mFlags & nsLayoutUtils::RECTS_ACCOUNT_FOR_TRANSFORMS) {
r = nsLayoutUtils::TransformFrameRectToAncestor(outer, r, mRelativeTo);
} else {
r += outer->GetOffsetTo(mRelativeTo);
}
mCallback->AddRect(r);
}
};
static nsSize
GetFrameBorderSize(nsIFrame* aFrame)
{
return aFrame->GetSize();
}
void
nsLayoutUtils::GetAllInFlowRects(nsIFrame* aFrame, nsIFrame* aRelativeTo,
RectCallback* aCallback, uint32_t aFlags)
{
BoxToRect converter(aRelativeTo, aCallback, aFlags, &GetFrameBorderSize);
GetAllInFlowBoxes(aFrame, &converter);
}
nsLayoutUtils::RectAccumulator::RectAccumulator() : mSeenFirstRect(false) {}
void nsLayoutUtils::RectAccumulator::AddRect(const nsRect& aRect) {
mResultRect.UnionRect(mResultRect, aRect);
if (!mSeenFirstRect) {
mSeenFirstRect = true;
mFirstRect = aRect;
}
}
nsLayoutUtils::RectListBuilder::RectListBuilder(nsClientRectList* aList)
: mRectList(aList)
{
}
void nsLayoutUtils::RectListBuilder::AddRect(const nsRect& aRect) {
nsRefPtr<nsClientRect> rect = new nsClientRect(mRectList);
rect->SetLayoutRect(aRect);
mRectList->Append(rect);
}
nsIFrame* nsLayoutUtils::GetContainingBlockForClientRect(nsIFrame* aFrame)
{
return aFrame->PresContext()->PresShell()->GetRootFrame();
}
nsRect
nsLayoutUtils::GetAllInFlowRectsUnion(nsIFrame* aFrame, nsIFrame* aRelativeTo,
uint32_t aFlags) {
RectAccumulator accumulator;
GetAllInFlowRects(aFrame, aRelativeTo, &accumulator, aFlags);
return accumulator.mResultRect.IsEmpty() ? accumulator.mFirstRect
: accumulator.mResultRect;
}
nsRect
nsLayoutUtils::GetTextShadowRectsUnion(const nsRect& aTextAndDecorationsRect,
nsIFrame* aFrame,
uint32_t aFlags)
{
const nsStyleText* textStyle = aFrame->StyleText();
if (!textStyle->HasTextShadow(aFrame))
return aTextAndDecorationsRect;
nsRect resultRect = aTextAndDecorationsRect;
int32_t A2D = aFrame->PresContext()->AppUnitsPerDevPixel();
for (uint32_t i = 0; i < textStyle->mTextShadow->Length(); ++i) {
nsCSSShadowItem* shadow = textStyle->mTextShadow->ShadowAt(i);
nsMargin blur = nsContextBoxBlur::GetBlurRadiusMargin(shadow->mRadius, A2D);
if ((aFlags & EXCLUDE_BLUR_SHADOWS) && blur != nsMargin(0, 0, 0, 0))
continue;
nsRect tmpRect(aTextAndDecorationsRect);
tmpRect.MoveBy(nsPoint(shadow->mXOffset, shadow->mYOffset));
tmpRect.Inflate(blur);
resultRect.UnionRect(resultRect, tmpRect);
}
return resultRect;
}
nsresult
nsLayoutUtils::GetFontMetricsForFrame(const nsIFrame* aFrame,
nsFontMetrics** aFontMetrics,
float aInflation)
{
return nsLayoutUtils::GetFontMetricsForStyleContext(aFrame->StyleContext(),
aFontMetrics,
aInflation);
}
nsresult
nsLayoutUtils::GetFontMetricsForStyleContext(nsStyleContext* aStyleContext,
nsFontMetrics** aFontMetrics,
float aInflation)
{
// pass the user font set object into the device context to pass along to CreateFontGroup
gfxUserFontSet* fs = aStyleContext->PresContext()->GetUserFontSet();
nsFont font = aStyleContext->StyleFont()->mFont;
// We need to not run font.size through floats when it's large since
// doing so would be lossy. Fortunately, in such cases, aInflation is
// guaranteed to be 1.0f.
if (aInflation != 1.0f) {
font.size = NSToCoordRound(font.size * aInflation);
}
return aStyleContext->PresContext()->DeviceContext()->GetMetricsFor(
font, aStyleContext->StyleFont()->mLanguage,
fs, *aFontMetrics);
}
nsIFrame*
nsLayoutUtils::FindChildContainingDescendant(nsIFrame* aParent, nsIFrame* aDescendantFrame)
{
nsIFrame* result = aDescendantFrame;
while (result) {
nsIFrame* parent = result->GetParent();
if (parent == aParent) {
break;
}
// The frame is not an immediate child of aParent so walk up another level
result = parent;
}
return result;
}
nsBlockFrame*
nsLayoutUtils::GetAsBlock(nsIFrame* aFrame)
{
nsBlockFrame* block = do_QueryFrame(aFrame);
return block;
}
nsBlockFrame*
nsLayoutUtils::FindNearestBlockAncestor(nsIFrame* aFrame)
{
nsIFrame* nextAncestor;
for (nextAncestor = aFrame->GetParent(); nextAncestor;
nextAncestor = nextAncestor->GetParent()) {
nsBlockFrame* block = GetAsBlock(nextAncestor);
if (block)
return block;
}
return nullptr;
}
nsIFrame*
nsLayoutUtils::GetNonGeneratedAncestor(nsIFrame* aFrame)
{
if (!(aFrame->GetStateBits() & NS_FRAME_GENERATED_CONTENT))
return aFrame;
nsIFrame* f = aFrame;
do {
f = GetParentOrPlaceholderFor(f);
} while (f->GetStateBits() & NS_FRAME_GENERATED_CONTENT);
return f;
}
nsIFrame*
nsLayoutUtils::GetParentOrPlaceholderFor(nsIFrame* aFrame)
{
if ((aFrame->GetStateBits() & NS_FRAME_OUT_OF_FLOW)
&& !aFrame->GetPrevInFlow()) {
return aFrame->PresContext()->PresShell()->FrameManager()->
GetPlaceholderFrameFor(aFrame);
}
return aFrame->GetParent();
}
nsIFrame*
nsLayoutUtils::GetParentOrPlaceholderForCrossDoc(nsIFrame* aFrame)
{
nsIFrame* f = GetParentOrPlaceholderFor(aFrame);
if (f)
return f;
return GetCrossDocParentFrame(aFrame);
}
nsIFrame*
nsLayoutUtils::GetNextContinuationOrSpecialSibling(nsIFrame *aFrame)
{
nsIFrame *result = aFrame->GetNextContinuation();
if (result)
return result;
if ((aFrame->GetStateBits() & NS_FRAME_IS_SPECIAL) != 0) {
// We only store the "special sibling" annotation with the first
// frame in the continuation chain. Walk back to find that frame now.
aFrame = aFrame->GetFirstContinuation();
void* value = aFrame->Properties().Get(nsIFrame::IBSplitSpecialSibling());
return static_cast<nsIFrame*>(value);
}
return nullptr;
}
nsIFrame*
nsLayoutUtils::GetFirstContinuationOrSpecialSibling(nsIFrame *aFrame)
{
nsIFrame *result = aFrame->GetFirstContinuation();
if (result->GetStateBits() & NS_FRAME_IS_SPECIAL) {
while (true) {
nsIFrame *f = static_cast<nsIFrame*>
(result->Properties().Get(nsIFrame::IBSplitSpecialPrevSibling()));
if (!f)
break;
result = f;
}
}
return result;
}
bool
nsLayoutUtils::IsViewportScrollbarFrame(nsIFrame* aFrame)
{
if (!aFrame)
return false;
nsIFrame* rootScrollFrame =
aFrame->PresContext()->PresShell()->GetRootScrollFrame();
if (!rootScrollFrame)
return false;
nsIScrollableFrame* rootScrollableFrame = do_QueryFrame(rootScrollFrame);
NS_ASSERTION(rootScrollableFrame, "The root scorollable frame is null");
if (!IsProperAncestorFrame(rootScrollFrame, aFrame))
return false;
nsIFrame* rootScrolledFrame = rootScrollableFrame->GetScrolledFrame();
return !(rootScrolledFrame == aFrame ||
IsProperAncestorFrame(rootScrolledFrame, aFrame));
}
static nscoord AddPercents(nsLayoutUtils::IntrinsicWidthType aType,
nscoord aCurrent, float aPercent)
{
nscoord result = aCurrent;
if (aPercent > 0.0f && aType == nsLayoutUtils::PREF_WIDTH) {
// XXX Should we also consider percentages for min widths, up to a
// limit?
if (aPercent >= 1.0f)
result = nscoord_MAX;
else
result = NSToCoordRound(float(result) / (1.0f - aPercent));
}
return result;
}
// Use only for widths/heights (or their min/max), since it clamps
// negative calc() results to 0.
static bool GetAbsoluteCoord(const nsStyleCoord& aStyle, nscoord& aResult)
{
if (aStyle.IsCalcUnit()) {
if (aStyle.CalcHasPercent()) {
return false;
}
// If it has no percents, we can pass 0 for the percentage basis.
aResult = nsRuleNode::ComputeComputedCalc(aStyle, 0);
if (aResult < 0)
aResult = 0;
return true;
}
if (eStyleUnit_Coord != aStyle.GetUnit())
return false;
aResult = aStyle.GetCoordValue();
NS_ASSERTION(aResult >= 0, "negative widths not allowed");
return true;
}
// Only call on style coords for which GetAbsoluteCoord returned false.
static bool
GetPercentHeight(const nsStyleCoord& aStyle,
nsIFrame* aFrame,
nscoord& aResult)
{
if (eStyleUnit_Percent != aStyle.GetUnit() &&
!aStyle.IsCalcUnit())
return false;
MOZ_ASSERT(!aStyle.IsCalcUnit() || aStyle.CalcHasPercent(),
"GetAbsoluteCoord should have handled this");
nsIFrame *f = aFrame->GetContainingBlock();
if (!f) {
NS_NOTREACHED("top of frame tree not a containing block");
return false;
}
const nsStylePosition *pos = f->StylePosition();
nscoord h;
if (!GetAbsoluteCoord(pos->mHeight, h) &&
!GetPercentHeight(pos->mHeight, f, h)) {
NS_ASSERTION(pos->mHeight.GetUnit() == eStyleUnit_Auto ||
pos->mHeight.HasPercent(),
"unknown height unit");
nsIAtom* fType = f->GetType();
if (fType != nsGkAtoms::viewportFrame && fType != nsGkAtoms::canvasFrame &&
fType != nsGkAtoms::pageContentFrame) {
// There's no basis for the percentage height, so it acts like auto.
// Should we consider a max-height < min-height pair a basis for
// percentage heights? The spec is somewhat unclear, and not doing
// so is simpler and avoids troubling discontinuities in behavior,
// so I'll choose not to. -LDB
return false;
}
NS_ASSERTION(pos->mHeight.GetUnit() == eStyleUnit_Auto,
"Unexpected height unit for viewport or canvas or page-content");
// For the viewport, canvas, and page-content kids, the percentage
// basis is just the parent height.
h = f->GetSize().height;
if (h == NS_UNCONSTRAINEDSIZE) {
// We don't have a percentage basis after all
return false;
}
}
nscoord maxh;
if (GetAbsoluteCoord(pos->mMaxHeight, maxh) ||
GetPercentHeight(pos->mMaxHeight, f, maxh)) {
if (maxh < h)
h = maxh;
} else {
NS_ASSERTION(pos->mMaxHeight.GetUnit() == eStyleUnit_None ||
pos->mMaxHeight.HasPercent(),
"unknown max-height unit");
}
nscoord minh;
if (GetAbsoluteCoord(pos->mMinHeight, minh) ||
GetPercentHeight(pos->mMinHeight, f, minh)) {
if (minh > h)
h = minh;
} else {
NS_ASSERTION(pos->mMinHeight.HasPercent(),
"unknown min-height unit");
}
if (aStyle.IsCalcUnit()) {
aResult = std::max(nsRuleNode::ComputeComputedCalc(aStyle, h), 0);
return true;
}
aResult = NSToCoordRound(aStyle.GetPercentValue() * h);
return true;
}
// Handles only -moz-max-content and -moz-min-content, and
// -moz-fit-content for min-width and max-width, since the others
// (-moz-fit-content for width, and -moz-available) have no effect on
// intrinsic widths.
enum eWidthProperty { PROP_WIDTH, PROP_MAX_WIDTH, PROP_MIN_WIDTH };
static bool
GetIntrinsicCoord(const nsStyleCoord& aStyle,
nsRenderingContext* aRenderingContext,
nsIFrame* aFrame,
eWidthProperty aProperty,
nscoord& aResult)
{
NS_PRECONDITION(aProperty == PROP_WIDTH || aProperty == PROP_MAX_WIDTH ||
aProperty == PROP_MIN_WIDTH, "unexpected property");
if (aStyle.GetUnit() != eStyleUnit_Enumerated)
return false;
int32_t val = aStyle.GetIntValue();
NS_ASSERTION(val == NS_STYLE_WIDTH_MAX_CONTENT ||
val == NS_STYLE_WIDTH_MIN_CONTENT ||
val == NS_STYLE_WIDTH_FIT_CONTENT ||
val == NS_STYLE_WIDTH_AVAILABLE,
"unexpected enumerated value for width property");
if (val == NS_STYLE_WIDTH_AVAILABLE)
return false;
if (val == NS_STYLE_WIDTH_FIT_CONTENT) {
if (aProperty == PROP_WIDTH)
return false; // handle like 'width: auto'
if (aProperty == PROP_MAX_WIDTH)
// constrain large 'width' values down to -moz-max-content
val = NS_STYLE_WIDTH_MAX_CONTENT;
else
// constrain small 'width' or 'max-width' values up to -moz-min-content
val = NS_STYLE_WIDTH_MIN_CONTENT;
}
NS_ASSERTION(val == NS_STYLE_WIDTH_MAX_CONTENT ||
val == NS_STYLE_WIDTH_MIN_CONTENT,
"should have reduced everything remaining to one of these");
// If aFrame is a container for font size inflation, then shrink
// wrapping inside of it should not apply font size inflation.
AutoMaybeDisableFontInflation an(aFrame);
if (val == NS_STYLE_WIDTH_MAX_CONTENT)
aResult = aFrame->GetPrefWidth(aRenderingContext);
else
aResult = aFrame->GetMinWidth(aRenderingContext);
return true;
}
#undef DEBUG_INTRINSIC_WIDTH
#ifdef DEBUG_INTRINSIC_WIDTH
static int32_t gNoiseIndent = 0;
#endif
/* static */ nscoord
nsLayoutUtils::IntrinsicForContainer(nsRenderingContext *aRenderingContext,
nsIFrame *aFrame,
IntrinsicWidthType aType)
{
NS_PRECONDITION(aFrame, "null frame");
NS_PRECONDITION(aType == MIN_WIDTH || aType == PREF_WIDTH, "bad type");
#ifdef DEBUG_INTRINSIC_WIDTH
nsFrame::IndentBy(stdout, gNoiseIndent);
static_cast<nsFrame*>(aFrame)->ListTag(stdout);
printf(" %s intrinsic width for container:\n",
aType == MIN_WIDTH ? "min" : "pref");
#endif
// If aFrame is a container for font size inflation, then shrink
// wrapping inside of it should not apply font size inflation.
AutoMaybeDisableFontInflation an(aFrame);
nsIFrame::IntrinsicWidthOffsetData offsets =
aFrame->IntrinsicWidthOffsets(aRenderingContext);
const nsStylePosition *stylePos = aFrame->StylePosition();
uint8_t boxSizing = stylePos->mBoxSizing;
const nsStyleCoord &styleWidth = stylePos->mWidth;
const nsStyleCoord &styleMinWidth = stylePos->mMinWidth;
const nsStyleCoord &styleMaxWidth = stylePos->mMaxWidth;
// We build up two values starting with the content box, and then
// adding padding, border and margin. The result is normally
// |result|. Then, when we handle 'width', 'min-width', and
// 'max-width', we use the results we've been building in |min| as a
// minimum, overriding 'min-width'. This ensures two things:
// * that we don't let a value of 'box-sizing' specifying a width
// smaller than the padding/border inside the box-sizing box give
// a content width less than zero
// * that we prevent tables from becoming smaller than their
// intrinsic minimum width
nscoord result = 0, min = 0;
nscoord maxw;
bool haveFixedMaxWidth = GetAbsoluteCoord(styleMaxWidth, maxw);
nscoord minw;
bool haveFixedMinWidth = GetAbsoluteCoord(styleMinWidth, minw);
// If we have a specified width (or a specified 'min-width' greater
// than the specified 'max-width', which works out to the same thing),
// don't even bother getting the frame's intrinsic width, because in
// this case GetAbsoluteCoord(styleWidth, w) will always succeed, so
// we'll never need the intrinsic dimensions.
if (styleWidth.GetUnit() == eStyleUnit_Enumerated &&
(styleWidth.GetIntValue() == NS_STYLE_WIDTH_MAX_CONTENT ||
styleWidth.GetIntValue() == NS_STYLE_WIDTH_MIN_CONTENT)) {
// -moz-fit-content and -moz-available enumerated widths compute intrinsic
// widths just like auto.
// For -moz-max-content and -moz-min-content, we handle them like
// specified widths, but ignore -moz-box-sizing.
boxSizing = NS_STYLE_BOX_SIZING_CONTENT;
} else if (!styleWidth.ConvertsToLength() &&
!(haveFixedMinWidth && haveFixedMaxWidth && maxw <= minw)) {
#ifdef DEBUG_INTRINSIC_WIDTH
++gNoiseIndent;
#endif
if (aType == MIN_WIDTH)
result = aFrame->GetMinWidth(aRenderingContext);
else
result = aFrame->GetPrefWidth(aRenderingContext);
#ifdef DEBUG_INTRINSIC_WIDTH
--gNoiseIndent;
nsFrame::IndentBy(stdout, gNoiseIndent);
static_cast<nsFrame*>(aFrame)->ListTag(stdout);
printf(" %s intrinsic width from frame is %d.\n",
aType == MIN_WIDTH ? "min" : "pref", result);
#endif
// Handle elements with an intrinsic ratio (or size) and a specified
// height, min-height, or max-height.
const nsStyleCoord &styleHeight = stylePos->mHeight;
const nsStyleCoord &styleMinHeight = stylePos->mMinHeight;
const nsStyleCoord &styleMaxHeight = stylePos->mMaxHeight;
if (styleHeight.GetUnit() != eStyleUnit_Auto ||
!(styleMinHeight.GetUnit() == eStyleUnit_Coord &&
styleMinHeight.GetCoordValue() == 0) ||
styleMaxHeight.GetUnit() != eStyleUnit_None) {
nsSize ratio = aFrame->GetIntrinsicRatio();
if (ratio.height != 0) {
nscoord heightTakenByBoxSizing = 0;
switch (boxSizing) {
case NS_STYLE_BOX_SIZING_BORDER: {
const nsStyleBorder* styleBorder = aFrame->StyleBorder();
heightTakenByBoxSizing +=
styleBorder->GetComputedBorder().TopBottom();
// fall through
}
case NS_STYLE_BOX_SIZING_PADDING: {
const nsStylePadding* stylePadding = aFrame->StylePadding();
nscoord pad;
if (GetAbsoluteCoord(stylePadding->mPadding.GetTop(), pad) ||
GetPercentHeight(stylePadding->mPadding.GetTop(), aFrame, pad)) {
heightTakenByBoxSizing += pad;
}
if (GetAbsoluteCoord(stylePadding->mPadding.GetBottom(), pad) ||
GetPercentHeight(stylePadding->mPadding.GetBottom(), aFrame, pad)) {
heightTakenByBoxSizing += pad;
}
// fall through
}
case NS_STYLE_BOX_SIZING_CONTENT:
default:
break;
}
nscoord h;
if (GetAbsoluteCoord(styleHeight, h) ||
GetPercentHeight(styleHeight, aFrame, h)) {
h = std::max(0, h - heightTakenByBoxSizing);
result =
NSToCoordRound(h * (float(ratio.width) / float(ratio.height)));
}
if (GetAbsoluteCoord(styleMaxHeight, h) ||
GetPercentHeight(styleMaxHeight, aFrame, h)) {
h = std::max(0, h - heightTakenByBoxSizing);
nscoord maxWidth =
NSToCoordRound(h * (float(ratio.width) / float(ratio.height)));
if (maxWidth < result)
result = maxWidth;
}
if (GetAbsoluteCoord(styleMinHeight, h) ||
GetPercentHeight(styleMinHeight, aFrame, h)) {
h = std::max(0, h - heightTakenByBoxSizing);
nscoord minWidth =
NSToCoordRound(h * (float(ratio.width) / float(ratio.height)));
if (minWidth > result)
result = minWidth;
}
}
}
}
if (aFrame->GetType() == nsGkAtoms::tableFrame) {
// Tables can't shrink smaller than their intrinsic minimum width,
// no matter what.
min = aFrame->GetMinWidth(aRenderingContext);
}
// We also need to track what has been added on outside of the box
// (controlled by 'box-sizing') where 'width', 'min-width' and
// 'max-width' are applied. We have to account for these properties
// after getting all the offsets (margin, border, padding) because
// percentages do not operate linearly.
// Doing this is ok because although percentages aren't handled
// linearly, they are handled monotonically.
nscoord coordOutsideWidth = offsets.hPadding;
float pctOutsideWidth = offsets.hPctPadding;
float pctTotal = 0.0f;
if (boxSizing == NS_STYLE_BOX_SIZING_PADDING) {
min += coordOutsideWidth;
result = NSCoordSaturatingAdd(result, coordOutsideWidth);
pctTotal += pctOutsideWidth;
coordOutsideWidth = 0;
pctOutsideWidth = 0.0f;
}
coordOutsideWidth += offsets.hBorder;
if (boxSizing == NS_STYLE_BOX_SIZING_BORDER) {
min += coordOutsideWidth;
result = NSCoordSaturatingAdd(result, coordOutsideWidth);
pctTotal += pctOutsideWidth;
coordOutsideWidth = 0;
pctOutsideWidth = 0.0f;
}
coordOutsideWidth += offsets.hMargin;
pctOutsideWidth += offsets.hPctMargin;
min += coordOutsideWidth;
result = NSCoordSaturatingAdd(result, coordOutsideWidth);
pctTotal += pctOutsideWidth;
nscoord w;
if (GetAbsoluteCoord(styleWidth, w) ||
GetIntrinsicCoord(styleWidth, aRenderingContext, aFrame,
PROP_WIDTH, w)) {
result = AddPercents(aType, w + coordOutsideWidth, pctOutsideWidth);
}
else if (aType == MIN_WIDTH &&
// The only cases of coord-percent-calc() units that
// GetAbsoluteCoord didn't handle are percent and calc()s
// containing percent.
styleWidth.IsCoordPercentCalcUnit() &&
aFrame->IsFrameOfType(nsIFrame::eReplaced)) {
// A percentage width on replaced elements means they can shrink to 0.
result = 0; // let |min| handle padding/border/margin
}
else {
// NOTE: We could really do a lot better for percents and for some
// cases of calc() containing percent (certainly including any where
// the coefficient on the percent is positive and there are no max()
// expressions). However, doing better for percents wouldn't be
// backwards compatible.
result = AddPercents(aType, result, pctTotal);
}
if (haveFixedMaxWidth ||
GetIntrinsicCoord(styleMaxWidth, aRenderingContext, aFrame,
PROP_MAX_WIDTH, maxw)) {
maxw = AddPercents(aType, maxw + coordOutsideWidth, pctOutsideWidth);
if (result > maxw)
result = maxw;
}
if (haveFixedMinWidth ||
GetIntrinsicCoord(styleMinWidth, aRenderingContext, aFrame,
PROP_MIN_WIDTH, minw)) {
minw = AddPercents(aType, minw + coordOutsideWidth, pctOutsideWidth);
if (result < minw)
result = minw;
}
min = AddPercents(aType, min, pctTotal);
if (result < min)
result = min;
const nsStyleDisplay *disp = aFrame->StyleDisplay();
if (aFrame->IsThemed(disp)) {
nsIntSize size(0, 0);
bool canOverride = true;
nsPresContext *presContext = aFrame->PresContext();
presContext->GetTheme()->
GetMinimumWidgetSize(aRenderingContext, aFrame, disp->mAppearance,
&size, &canOverride);
nscoord themeWidth = presContext->DevPixelsToAppUnits(size.width);
// GMWS() returns a border-box width
themeWidth += offsets.hMargin;
themeWidth = AddPercents(aType, themeWidth, offsets.hPctMargin);
if (themeWidth > result || !canOverride)
result = themeWidth;
}
#ifdef DEBUG_INTRINSIC_WIDTH
nsFrame::IndentBy(stdout, gNoiseIndent);
static_cast<nsFrame*>(aFrame)->ListTag(stdout);
printf(" %s intrinsic width for container is %d twips.\n",
aType == MIN_WIDTH ? "min" : "pref", result);
#endif
return result;
}
/* static */ nscoord
nsLayoutUtils::ComputeCBDependentValue(nscoord aPercentBasis,
const nsStyleCoord& aCoord)
{
NS_WARN_IF_FALSE(aPercentBasis != NS_UNCONSTRAINEDSIZE,
"have unconstrained width or height; this should only "
"result from very large sizes, not attempts at intrinsic "
"size calculation");
if (aCoord.IsCoordPercentCalcUnit()) {
return nsRuleNode::ComputeCoordPercentCalc(aCoord, aPercentBasis);
}
NS_ASSERTION(aCoord.GetUnit() == eStyleUnit_None ||
aCoord.GetUnit() == eStyleUnit_Auto,
"unexpected width value");
return 0;
}
/* static */ nscoord
nsLayoutUtils::ComputeWidthValue(
nsRenderingContext* aRenderingContext,
nsIFrame* aFrame,
nscoord aContainingBlockWidth,
nscoord aContentEdgeToBoxSizing,
nscoord aBoxSizingToMarginEdge,
const nsStyleCoord& aCoord)
{
NS_PRECONDITION(aFrame, "non-null frame expected");
NS_PRECONDITION(aRenderingContext, "non-null rendering context expected");
NS_WARN_IF_FALSE(aContainingBlockWidth != NS_UNCONSTRAINEDSIZE,
"have unconstrained width; this should only result from "
"very large sizes, not attempts at intrinsic width "
"calculation");
NS_PRECONDITION(aContainingBlockWidth >= 0,
"width less than zero");
nscoord result;
if (aCoord.IsCoordPercentCalcUnit()) {
result = nsRuleNode::ComputeCoordPercentCalc(aCoord,
aContainingBlockWidth);
// The result of a calc() expression might be less than 0; we
// should clamp at runtime (below). (Percentages and coords that
// are less than 0 have already been dropped by the parser.)
result -= aContentEdgeToBoxSizing;
} else {
MOZ_ASSERT(eStyleUnit_Enumerated == aCoord.GetUnit());
// If aFrame is a container for font size inflation, then shrink
// wrapping inside of it should not apply font size inflation.
AutoMaybeDisableFontInflation an(aFrame);
int32_t val = aCoord.GetIntValue();
switch (val) {
case NS_STYLE_WIDTH_MAX_CONTENT:
result = aFrame->GetPrefWidth(aRenderingContext);
NS_ASSERTION(result >= 0, "width less than zero");
break;
case NS_STYLE_WIDTH_MIN_CONTENT:
result = aFrame->GetMinWidth(aRenderingContext);
NS_ASSERTION(result >= 0, "width less than zero");
break;
case NS_STYLE_WIDTH_FIT_CONTENT:
{
nscoord pref = aFrame->GetPrefWidth(aRenderingContext),
min = aFrame->GetMinWidth(aRenderingContext),
fill = aContainingBlockWidth -
(aBoxSizingToMarginEdge + aContentEdgeToBoxSizing);
result = std::max(min, std::min(pref, fill));
NS_ASSERTION(result >= 0, "width less than zero");
}
break;
case NS_STYLE_WIDTH_AVAILABLE:
result = aContainingBlockWidth -
(aBoxSizingToMarginEdge + aContentEdgeToBoxSizing);
}
}
return std::max(0, result);
}
/* static */ nscoord
nsLayoutUtils::ComputeHeightDependentValue(
nscoord aContainingBlockHeight,
const nsStyleCoord& aCoord)
{
// XXXldb Some callers explicitly check aContainingBlockHeight
// against NS_AUTOHEIGHT *and* unit against eStyleUnit_Percent or
// calc()s containing percents before calling this function.
// However, it would be much more likely to catch problems without
// the unit conditions.
// XXXldb Many callers pass a non-'auto' containing block height when
// according to CSS2.1 they should be passing 'auto'.
NS_PRECONDITION(NS_AUTOHEIGHT != aContainingBlockHeight ||
!aCoord.HasPercent(),
"unexpected containing block height");
if (aCoord.IsCoordPercentCalcUnit()) {
return nsRuleNode::ComputeCoordPercentCalc(aCoord, aContainingBlockHeight);
}
NS_ASSERTION(aCoord.GetUnit() == eStyleUnit_None ||
aCoord.GetUnit() == eStyleUnit_Auto,
"unexpected height value");
return 0;
}
#define MULDIV(a,b,c) (nscoord(int64_t(a) * int64_t(b) / int64_t(c)))
/* static */ nsSize
nsLayoutUtils::ComputeSizeWithIntrinsicDimensions(
nsRenderingContext* aRenderingContext, nsIFrame* aFrame,
const nsIFrame::IntrinsicSize& aIntrinsicSize,
nsSize aIntrinsicRatio, nsSize aCBSize,
nsSize aMargin, nsSize aBorder, nsSize aPadding)
{
const nsStylePosition* stylePos = aFrame->StylePosition();
// If we're a flex item, we'll compute our size a bit differently.
const nsStyleCoord* widthStyleCoord = &(stylePos->mWidth);
const nsStyleCoord* heightStyleCoord = &(stylePos->mHeight);
bool isFlexItem = aFrame->IsFlexItem();
bool isHorizontalFlexItem = false;
if (isFlexItem) {
// Flex items use their "flex-basis" property in place of their main-size
// property (e.g. "width") for sizing purposes, *unless* they have
// "flex-basis:auto", in which case they use their main-size property after
// all.
uint32_t flexDirection =
aFrame->GetParent()->StylePosition()->mFlexDirection;
isHorizontalFlexItem =
flexDirection == NS_STYLE_FLEX_DIRECTION_ROW ||
flexDirection == NS_STYLE_FLEX_DIRECTION_ROW_REVERSE;
// NOTE: The logic here should match the similar chunk for determining
// widthStyleCoord and heightStyleCoord in nsFrame::ComputeSize().
const nsStyleCoord* flexBasis = &(stylePos->mFlexBasis);
if (flexBasis->GetUnit() != eStyleUnit_Auto) {
if (isHorizontalFlexItem) {
widthStyleCoord = flexBasis;
} else {
// One caveat for vertical flex items: We don't support enumerated
// values (e.g. "max-content") for height properties yet. So, if our
// computed flex-basis is an enumerated value, we'll just behave as if
// it were "auto", which means "use the main-size property after all"
// (which is "height", in this case).
// NOTE: Once we support intrinsic sizing keywords for "height",
// we should remove this check.
if (flexBasis->GetUnit() != eStyleUnit_Enumerated) {
heightStyleCoord = flexBasis;
}
}
}
}
// Handle intrinsic sizes and their interaction with
// {min-,max-,}{width,height} according to the rules in
// http://www.w3.org/TR/CSS21/visudet.html#min-max-widths
// Note: throughout the following section of the function, I avoid
// a * (b / c) because of its reduced accuracy relative to a * b / c
// or (a * b) / c (which are equivalent).
const bool isAutoWidth = widthStyleCoord->GetUnit() == eStyleUnit_Auto;
const bool isAutoHeight = IsAutoHeight(*heightStyleCoord, aCBSize.height);
nsSize boxSizingAdjust(0,0);
switch (stylePos->mBoxSizing) {
case NS_STYLE_BOX_SIZING_BORDER:
boxSizingAdjust += aBorder;
// fall through
case NS_STYLE_BOX_SIZING_PADDING:
boxSizingAdjust += aPadding;
}
nscoord boxSizingToMarginEdgeWidth =
aMargin.width + aBorder.width + aPadding.width - boxSizingAdjust.width;
nscoord width, minWidth, maxWidth, height, minHeight, maxHeight;
if (!isAutoWidth) {
width = nsLayoutUtils::ComputeWidthValue(aRenderingContext,
aFrame, aCBSize.width, boxSizingAdjust.width,
boxSizingToMarginEdgeWidth, *widthStyleCoord);
}
if (stylePos->mMaxWidth.GetUnit() != eStyleUnit_None &&
!(isFlexItem && isHorizontalFlexItem)) {
maxWidth = nsLayoutUtils::ComputeWidthValue(aRenderingContext,
aFrame, aCBSize.width, boxSizingAdjust.width,
boxSizingToMarginEdgeWidth, stylePos->mMaxWidth);
} else {
// NOTE: Flex items ignore their min & max sizing properties in their
// flex container's main-axis. (Those properties get applied later in
// the flexbox algorithm.)
maxWidth = nscoord_MAX;
}
if (!(isFlexItem && isHorizontalFlexItem)) {
minWidth = nsLayoutUtils::ComputeWidthValue(aRenderingContext,
aFrame, aCBSize.width, boxSizingAdjust.width,
boxSizingToMarginEdgeWidth, stylePos->mMinWidth);
} else {
// NOTE: Flex items ignore their min & max sizing properties in their
// flex container's main-axis. (Those properties get applied later in
// the flexbox algorithm.)
minWidth = 0;
}
if (!isAutoHeight) {
height = nsLayoutUtils::ComputeHeightValue(aCBSize.height,
boxSizingAdjust.height,
*heightStyleCoord);
}
if (!IsAutoHeight(stylePos->mMaxHeight, aCBSize.height) &&
!(isFlexItem && !isHorizontalFlexItem)) {
maxHeight = nsLayoutUtils::ComputeHeightValue(aCBSize.height,
boxSizingAdjust.height,
stylePos->mMaxHeight);
} else {
maxHeight = nscoord_MAX;
}
if (!IsAutoHeight(stylePos->mMinHeight, aCBSize.height) &&
!(isFlexItem && !isHorizontalFlexItem)) {
minHeight = nsLayoutUtils::ComputeHeightValue(aCBSize.height,
boxSizingAdjust.height,
stylePos->mMinHeight);
} else {
minHeight = 0;
}
// Resolve percentage intrinsic width/height as necessary:
NS_ASSERTION(aCBSize.width != NS_UNCONSTRAINEDSIZE,
"Our containing block must not have unconstrained width!");
bool hasIntrinsicWidth, hasIntrinsicHeight;
nscoord intrinsicWidth, intrinsicHeight;
if (aIntrinsicSize.width.GetUnit() == eStyleUnit_Coord) {
hasIntrinsicWidth = true;
intrinsicWidth = aIntrinsicSize.width.GetCoordValue();
if (intrinsicWidth < 0)
intrinsicWidth = 0;
} else {
NS_ASSERTION(aIntrinsicSize.width.GetUnit() == eStyleUnit_None,
"unexpected unit");
hasIntrinsicWidth = false;
intrinsicWidth = 0;
}
if (aIntrinsicSize.height.GetUnit() == eStyleUnit_Coord) {
hasIntrinsicHeight = true;
intrinsicHeight = aIntrinsicSize.height.GetCoordValue();
if (intrinsicHeight < 0)
intrinsicHeight = 0;
} else {
NS_ASSERTION(aIntrinsicSize.height.GetUnit() == eStyleUnit_None,
"unexpected unit");
hasIntrinsicHeight = false;
intrinsicHeight = 0;
}
NS_ASSERTION(aIntrinsicRatio.width >= 0 && aIntrinsicRatio.height >= 0,
"Intrinsic ratio has a negative component!");
// Now calculate the used values for width and height:
if (isAutoWidth) {
if (isAutoHeight) {
// 'auto' width, 'auto' height
// Get tentative values - CSS 2.1 sections 10.3.2 and 10.6.2:
nscoord tentWidth, tentHeight;
if (hasIntrinsicWidth) {
tentWidth = intrinsicWidth;
} else if (hasIntrinsicHeight && aIntrinsicRatio.height > 0) {
tentWidth = MULDIV(intrinsicHeight, aIntrinsicRatio.width, aIntrinsicRatio.height);
} else if (aIntrinsicRatio.width > 0) {
tentWidth = aCBSize.width - boxSizingToMarginEdgeWidth; // XXX scrollbar?
if (tentWidth < 0) tentWidth = 0;
} else {
tentWidth = nsPresContext::CSSPixelsToAppUnits(300);
}
if (hasIntrinsicHeight) {
tentHeight = intrinsicHeight;
} else if (aIntrinsicRatio.width > 0) {
tentHeight = MULDIV(tentWidth, aIntrinsicRatio.height, aIntrinsicRatio.width);
} else {
tentHeight = nsPresContext::CSSPixelsToAppUnits(150);
}
return ComputeAutoSizeWithIntrinsicDimensions(minWidth, minHeight,
maxWidth, maxHeight,
tentWidth, tentHeight);
} else {
// 'auto' width, non-'auto' height
height = NS_CSS_MINMAX(height, minHeight, maxHeight);
if (aIntrinsicRatio.height > 0) {
width = MULDIV(height, aIntrinsicRatio.width, aIntrinsicRatio.height);
} else if (hasIntrinsicWidth) {
width = intrinsicWidth;
} else {
width = nsPresContext::CSSPixelsToAppUnits(300);
}
width = NS_CSS_MINMAX(width, minWidth, maxWidth);
}
} else {
if (isAutoHeight) {
// non-'auto' width, 'auto' height
width = NS_CSS_MINMAX(width, minWidth, maxWidth);
if (aIntrinsicRatio.width > 0) {
height = MULDIV(width, aIntrinsicRatio.height, aIntrinsicRatio.width);
} else if (hasIntrinsicHeight) {
height = intrinsicHeight;
} else {
height = nsPresContext::CSSPixelsToAppUnits(150);
}
height = NS_CSS_MINMAX(height, minHeight, maxHeight);
} else {
// non-'auto' width, non-'auto' height
width = NS_CSS_MINMAX(width, minWidth, maxWidth);
height = NS_CSS_MINMAX(height, minHeight, maxHeight);
}
}
return nsSize(width, height);
}
nsSize
nsLayoutUtils::ComputeAutoSizeWithIntrinsicDimensions(nscoord minWidth, nscoord minHeight,
nscoord maxWidth, nscoord maxHeight,
nscoord tentWidth, nscoord tentHeight)
{
// Now apply min/max-width/height - CSS 2.1 sections 10.4 and 10.7:
if (minWidth > maxWidth)
maxWidth = minWidth;
if (minHeight > maxHeight)
maxHeight = minHeight;
nscoord heightAtMaxWidth, heightAtMinWidth,
widthAtMaxHeight, widthAtMinHeight;
if (tentWidth > 0) {
heightAtMaxWidth = MULDIV(maxWidth, tentHeight, tentWidth);
if (heightAtMaxWidth < minHeight)
heightAtMaxWidth = minHeight;
heightAtMinWidth = MULDIV(minWidth, tentHeight, tentWidth);
if (heightAtMinWidth > maxHeight)
heightAtMinWidth = maxHeight;
} else {
heightAtMaxWidth = heightAtMinWidth = NS_CSS_MINMAX(tentHeight, minHeight, maxHeight);
}
if (tentHeight > 0) {
widthAtMaxHeight = MULDIV(maxHeight, tentWidth, tentHeight);
if (widthAtMaxHeight < minWidth)
widthAtMaxHeight = minWidth;
widthAtMinHeight = MULDIV(minHeight, tentWidth, tentHeight);
if (widthAtMinHeight > maxWidth)
widthAtMinHeight = maxWidth;
} else {
widthAtMaxHeight = widthAtMinHeight = NS_CSS_MINMAX(tentWidth, minWidth, maxWidth);
}
// The table at http://www.w3.org/TR/CSS21/visudet.html#min-max-widths :
nscoord width, height;
if (tentWidth > maxWidth) {
if (tentHeight > maxHeight) {
if (int64_t(maxWidth) * int64_t(tentHeight) <=
int64_t(maxHeight) * int64_t(tentWidth)) {
width = maxWidth;
height = heightAtMaxWidth;
} else {
width = widthAtMaxHeight;
height = maxHeight;
}
} else {
// This also covers "(w > max-width) and (h < min-height)" since in
// that case (max-width/w < 1), and with (h < min-height):
// max(max-width * h/w, min-height) == min-height
width = maxWidth;
height = heightAtMaxWidth;
}
} else if (tentWidth < minWidth) {
if (tentHeight < minHeight) {
if (int64_t(minWidth) * int64_t(tentHeight) <=
int64_t(minHeight) * int64_t(tentWidth)) {
width = widthAtMinHeight;
height = minHeight;
} else {
width = minWidth;
height = heightAtMinWidth;
}
} else {
// This also covers "(w < min-width) and (h > max-height)" since in
// that case (min-width/w > 1), and with (h > max-height):
// min(min-width * h/w, max-height) == max-height
width = minWidth;
height = heightAtMinWidth;
}
} else {
if (tentHeight > maxHeight) {
width = widthAtMaxHeight;
height = maxHeight;
} else if (tentHeight < minHeight) {
width = widthAtMinHeight;
height = minHeight;
} else {
width = tentWidth;
height = tentHeight;
}
}
return nsSize(width, height);
}
/* static */ nscoord
nsLayoutUtils::MinWidthFromInline(nsIFrame* aFrame,
nsRenderingContext* aRenderingContext)
{
NS_ASSERTION(!nsLayoutUtils::IsContainerForFontSizeInflation(aFrame),
"should not be container for font size inflation");
nsIFrame::InlineMinWidthData data;
DISPLAY_MIN_WIDTH(aFrame, data.prevLines);
aFrame->AddInlineMinWidth(aRenderingContext, &data);
data.ForceBreak(aRenderingContext);
return data.prevLines;
}
/* static */ nscoord
nsLayoutUtils::PrefWidthFromInline(nsIFrame* aFrame,
nsRenderingContext* aRenderingContext)
{
NS_ASSERTION(!nsLayoutUtils::IsContainerForFontSizeInflation(aFrame),
"should not be container for font size inflation");
nsIFrame::InlinePrefWidthData data;
DISPLAY_PREF_WIDTH(aFrame, data.prevLines);
aFrame->AddInlinePrefWidth(aRenderingContext, &data);
data.ForceBreak(aRenderingContext);
return data.prevLines;
}
static nscolor
DarkenColor(nscolor aColor)
{
uint16_t hue, sat, value;
uint8_t alpha;
// convert the RBG to HSV so we can get the lightness (which is the v)
NS_RGB2HSV(aColor, hue, sat, value, alpha);
// The goal here is to send white to black while letting colored
// stuff stay colored... So we adopt the following approach.
// Something with sat = 0 should end up with value = 0. Something
// with a high sat can end up with a high value and it's ok.... At
// the same time, we don't want to make things lighter. Do
// something simple, since it seems to work.
if (value > sat) {
value = sat;
// convert this color back into the RGB color space.
NS_HSV2RGB(aColor, hue, sat, value, alpha);
}
return aColor;
}
// Check whether we should darken text/decoration colors. We need to do this if
// background images and colors are being suppressed, because that means
// light text will not be visible against the (presumed light-colored) background.
static bool
ShouldDarkenColors(nsPresContext* aPresContext)
{
return !aPresContext->GetBackgroundColorDraw() &&
!aPresContext->GetBackgroundImageDraw();
}
nscolor
nsLayoutUtils::GetColor(nsIFrame* aFrame, nsCSSProperty aProperty)
{
nscolor color = aFrame->GetVisitedDependentColor(aProperty);
if (ShouldDarkenColors(aFrame->PresContext())) {
color = DarkenColor(color);
}
return color;
}
gfxFloat
nsLayoutUtils::GetSnappedBaselineY(nsIFrame* aFrame, gfxContext* aContext,
nscoord aY, nscoord aAscent)
{
gfxFloat appUnitsPerDevUnit = aFrame->PresContext()->AppUnitsPerDevPixel();
gfxFloat baseline = gfxFloat(aY) + aAscent;
gfxRect putativeRect(0, baseline/appUnitsPerDevUnit, 1, 1);
if (!aContext->UserToDevicePixelSnapped(putativeRect, true))
return baseline;
return aContext->DeviceToUser(putativeRect.TopLeft()).y * appUnitsPerDevUnit;
}
void
nsLayoutUtils::DrawString(const nsIFrame* aFrame,
nsRenderingContext* aContext,
const PRUnichar* aString,
int32_t aLength,
nsPoint aPoint,
uint8_t aDirection)
{
#ifdef IBMBIDI
nsresult rv = NS_ERROR_FAILURE;
nsPresContext* presContext = aFrame->PresContext();
if (presContext->BidiEnabled()) {
if (aDirection == NS_STYLE_DIRECTION_INHERIT) {
aDirection = aFrame->StyleVisibility()->mDirection;
}
nsBidiDirection direction =
(NS_STYLE_DIRECTION_RTL == aDirection) ?
NSBIDI_RTL : NSBIDI_LTR;
rv = nsBidiPresUtils::RenderText(aString, aLength, direction,
presContext, *aContext, *aContext,
aPoint.x, aPoint.y);
}
if (NS_FAILED(rv))
#endif // IBMBIDI
{
aContext->SetTextRunRTL(false);
aContext->DrawString(aString, aLength, aPoint.x, aPoint.y);
}
}
nscoord
nsLayoutUtils::GetStringWidth(const nsIFrame* aFrame,
nsRenderingContext* aContext,
const PRUnichar* aString,
int32_t aLength)
{
#ifdef IBMBIDI
nsPresContext* presContext = aFrame->PresContext();
if (presContext->BidiEnabled()) {
const nsStyleVisibility* vis = aFrame->StyleVisibility();
nsBidiDirection direction =
(NS_STYLE_DIRECTION_RTL == vis->mDirection) ?
NSBIDI_RTL : NSBIDI_LTR;
return nsBidiPresUtils::MeasureTextWidth(aString, aLength,
direction, presContext, *aContext);
}
#endif // IBMBIDI
aContext->SetTextRunRTL(false);
return aContext->GetWidth(aString, aLength);
}
/* static */ void
nsLayoutUtils::PaintTextShadow(const nsIFrame* aFrame,
nsRenderingContext* aContext,
const nsRect& aTextRect,
const nsRect& aDirtyRect,
const nscolor& aForegroundColor,
TextShadowCallback aCallback,
void* aCallbackData)
{
const nsStyleText* textStyle = aFrame->StyleText();
if (!textStyle->HasTextShadow(aFrame))
return;
// Text shadow happens with the last value being painted at the back,
// ie. it is painted first.
gfxContext* aDestCtx = aContext->ThebesContext();
for (uint32_t i = textStyle->mTextShadow->Length(); i > 0; --i) {
nsCSSShadowItem* shadowDetails = textStyle->mTextShadow->ShadowAt(i - 1);
nsPoint shadowOffset(shadowDetails->mXOffset,
shadowDetails->mYOffset);
nscoord blurRadius = std::max(shadowDetails->mRadius, 0);
nsRect shadowRect(aTextRect);
shadowRect.MoveBy(shadowOffset);
nsPresContext* presCtx = aFrame->PresContext();
nsContextBoxBlur contextBoxBlur;
gfxContext* shadowContext = contextBoxBlur.Init(shadowRect, 0, blurRadius,
presCtx->AppUnitsPerDevPixel(),
aDestCtx, aDirtyRect, nullptr);
if (!shadowContext)
continue;
nscolor shadowColor;
if (shadowDetails->mHasColor)
shadowColor = shadowDetails->mColor;
else
shadowColor = aForegroundColor;
// Conjure an nsRenderingContext from a gfxContext for drawing the text
// to blur.
nsRefPtr<nsRenderingContext> renderingContext = new nsRenderingContext();
renderingContext->Init(presCtx->DeviceContext(), shadowContext);
aDestCtx->Save();
aDestCtx->NewPath();
aDestCtx->SetColor(gfxRGBA(shadowColor));
// The callback will draw whatever we want to blur as a shadow.
aCallback(renderingContext, shadowOffset, shadowColor, aCallbackData);
contextBoxBlur.DoPaint();
aDestCtx->Restore();
}
}
/* static */ nscoord
nsLayoutUtils::GetCenteredFontBaseline(nsFontMetrics* aFontMetrics,
nscoord aLineHeight)
{
nscoord fontAscent = aFontMetrics->MaxAscent();
nscoord fontHeight = aFontMetrics->MaxHeight();
nscoord leading = aLineHeight - fontHeight;
return fontAscent + leading/2;
}
/* static */ bool
nsLayoutUtils::GetFirstLineBaseline(const nsIFrame* aFrame, nscoord* aResult)
{
LinePosition position;
if (!GetFirstLinePosition(aFrame, &position))
return false;
*aResult = position.mBaseline;
return true;
}
/* static */ bool
nsLayoutUtils::GetFirstLinePosition(const nsIFrame* aFrame,
LinePosition* aResult)
{
const nsBlockFrame* block = nsLayoutUtils::GetAsBlock(const_cast<nsIFrame*>(aFrame));
if (!block) {
// For the first-line baseline we also have to check for a table, and if
// so, use the baseline of its first row.
nsIAtom* fType = aFrame->GetType();
if (fType == nsGkAtoms::tableOuterFrame) {
aResult->mTop = 0;
aResult->mBaseline = aFrame->GetBaseline();
// This is what we want for the list bullet caller; not sure if
// other future callers will want the same.
aResult->mBottom = aFrame->GetSize().height;
return true;
}
// For first-line baselines, we have to consider scroll frames.
if (fType == nsGkAtoms::scrollFrame) {
nsIScrollableFrame *sFrame = do_QueryFrame(const_cast<nsIFrame*>(aFrame));
if (!sFrame) {
NS_NOTREACHED("not scroll frame");
}
LinePosition kidPosition;
if (GetFirstLinePosition(sFrame->GetScrolledFrame(), &kidPosition)) {
// Consider only the border and padding that contributes to the
// kid's position, not the scrolling, so we get the initial
// position.
*aResult = kidPosition + aFrame->GetUsedBorderAndPadding().top;
return true;
}
return false;
}
if (fType == nsGkAtoms::fieldSetFrame) {
LinePosition kidPosition;
nsIFrame* kid = aFrame->GetFirstPrincipalChild();
// kid might be a legend frame here, but that's ok.
if (GetFirstLinePosition(kid, &kidPosition)) {
*aResult = kidPosition + (kid->GetPosition().y -
kid->GetRelativeOffset().y);
return true;
}
return false;
}
// No baseline.
return false;
}
for (nsBlockFrame::const_line_iterator line = block->begin_lines(),
line_end = block->end_lines();
line != line_end; ++line) {
if (line->IsBlock()) {
nsIFrame *kid = line->mFirstChild;
LinePosition kidPosition;
if (GetFirstLinePosition(kid, &kidPosition)) {
*aResult = kidPosition + (kid->GetPosition().y -
kid->GetRelativeOffset().y);
return true;
}
} else {
// XXX Is this the right test? We have some bogus empty lines
// floating around, but IsEmpty is perhaps too weak.
if (line->GetHeight() != 0 || !line->IsEmpty()) {
nscoord top = line->mBounds.y;
aResult->mTop = top;
aResult->mBaseline = top + line->GetAscent();
aResult->mBottom = top + line->GetHeight();
return true;
}
}
}
return false;
}
/* static */ bool
nsLayoutUtils::GetLastLineBaseline(const nsIFrame* aFrame, nscoord* aResult)
{
const nsBlockFrame* block = nsLayoutUtils::GetAsBlock(const_cast<nsIFrame*>(aFrame));
if (!block)
// No baseline. (We intentionally don't descend into scroll frames.)
return false;
for (nsBlockFrame::const_reverse_line_iterator line = block->rbegin_lines(),
line_end = block->rend_lines();
line != line_end; ++line) {
if (line->IsBlock()) {
nsIFrame *kid = line->mFirstChild;
nscoord kidBaseline;
if (GetLastLineBaseline(kid, &kidBaseline)) {
// Ignore relative positioning for baseline calculations
*aResult = kidBaseline + kid->GetPosition().y -
kid->GetRelativeOffset().y;
return true;
} else if (kid->GetType() == nsGkAtoms::scrollFrame) {
// Use the bottom of the scroll frame.
// XXX CSS2.1 really doesn't say what to do here.
*aResult = kid->GetRect().YMost() - kid->GetRelativeOffset().y;
return true;
}
} else {
// XXX Is this the right test? We have some bogus empty lines
// floating around, but IsEmpty is perhaps too weak.
if (line->GetHeight() != 0 || !line->IsEmpty()) {
*aResult = line->mBounds.y + line->GetAscent();
return true;
}
}
}
return false;
}
static nscoord
CalculateBlockContentBottom(nsBlockFrame* aFrame)
{
NS_PRECONDITION(aFrame, "null ptr");
nscoord contentBottom = 0;
for (nsBlockFrame::line_iterator line = aFrame->begin_lines(),
line_end = aFrame->end_lines();
line != line_end; ++line) {
if (line->IsBlock()) {
nsIFrame* child = line->mFirstChild;
nscoord offset = child->GetRect().y - child->GetRelativeOffset().y;
contentBottom = std::max(contentBottom,
nsLayoutUtils::CalculateContentBottom(child) + offset);
}
else {
contentBottom = std::max(contentBottom, line->mBounds.YMost());
}
}
return contentBottom;
}
/* static */ nscoord
nsLayoutUtils::CalculateContentBottom(nsIFrame* aFrame)
{
NS_PRECONDITION(aFrame, "null ptr");
nscoord contentBottom = aFrame->GetRect().height;
// We want scrollable overflow rather than visual because this
// calculation is intended to affect layout.
if (aFrame->GetScrollableOverflowRect().height > contentBottom) {
nsIFrame::ChildListIDs skip(nsIFrame::kOverflowList |
nsIFrame::kExcessOverflowContainersList |
nsIFrame::kOverflowOutOfFlowList);
nsBlockFrame* blockFrame = GetAsBlock(aFrame);
if (blockFrame) {
contentBottom =
std::max(contentBottom, CalculateBlockContentBottom(blockFrame));
skip |= nsIFrame::kPrincipalList;
}
nsIFrame::ChildListIterator lists(aFrame);
for (; !lists.IsDone(); lists.Next()) {
if (!skip.Contains(lists.CurrentID())) {
nsFrameList::Enumerator childFrames(lists.CurrentList());
for (; !childFrames.AtEnd(); childFrames.Next()) {
nsIFrame* child = childFrames.get();
nscoord offset = child->GetRect().y - child->GetRelativeOffset().y;
contentBottom = std::max(contentBottom,
CalculateContentBottom(child) + offset);
}
}
}
}
return contentBottom;
}
/* static */ nsIFrame*
nsLayoutUtils::GetClosestLayer(nsIFrame* aFrame)
{
nsIFrame* layer;
for (layer = aFrame; layer; layer = layer->GetParent()) {
if (layer->IsPositioned() ||
(layer->GetParent() &&
layer->GetParent()->GetType() == nsGkAtoms::scrollFrame))
break;
}
if (layer)
return layer;
return aFrame->PresContext()->PresShell()->FrameManager()->GetRootFrame();
}
GraphicsFilter
nsLayoutUtils::GetGraphicsFilterForFrame(nsIFrame* aForFrame)
{
GraphicsFilter defaultFilter = gfxPattern::FILTER_GOOD;
nsStyleContext *sc;
if (nsCSSRendering::IsCanvasFrame(aForFrame)) {
nsCSSRendering::FindBackground(aForFrame, &sc);
} else {
sc = aForFrame->StyleContext();
}
switch (sc->StyleSVG()->mImageRendering) {
case NS_STYLE_IMAGE_RENDERING_OPTIMIZESPEED:
return gfxPattern::FILTER_FAST;
case NS_STYLE_IMAGE_RENDERING_OPTIMIZEQUALITY:
return gfxPattern::FILTER_BEST;
case NS_STYLE_IMAGE_RENDERING_CRISPEDGES:
return gfxPattern::FILTER_NEAREST;
default:
return defaultFilter;
}
}
/**
* Given an image being drawn into an appunit coordinate system, and
* a point in that coordinate system, map the point back into image
* pixel space.
* @param aSize the size of the image, in pixels
* @param aDest the rectangle that the image is being mapped into
* @param aPt a point in the same coordinate system as the rectangle
*/
static gfxPoint
MapToFloatImagePixels(const gfxSize& aSize,
const gfxRect& aDest, const gfxPoint& aPt)
{
return gfxPoint(((aPt.x - aDest.X())*aSize.width)/aDest.Width(),
((aPt.y - aDest.Y())*aSize.height)/aDest.Height());
}
/**
* Given an image being drawn into an pixel-based coordinate system, and
* a point in image space, map the point into the pixel-based coordinate
* system.
* @param aSize the size of the image, in pixels
* @param aDest the rectangle that the image is being mapped into
* @param aPt a point in image space
*/
static gfxPoint
MapToFloatUserPixels(const gfxSize& aSize,
const gfxRect& aDest, const gfxPoint& aPt)
{
return gfxPoint(aPt.x*aDest.Width()/aSize.width + aDest.X(),
aPt.y*aDest.Height()/aSize.height + aDest.Y());
}
/* static */ gfxRect
nsLayoutUtils::RectToGfxRect(const nsRect& aRect, int32_t aAppUnitsPerDevPixel)
{
return gfxRect(gfxFloat(aRect.x) / aAppUnitsPerDevPixel,
gfxFloat(aRect.y) / aAppUnitsPerDevPixel,
gfxFloat(aRect.width) / aAppUnitsPerDevPixel,
gfxFloat(aRect.height) / aAppUnitsPerDevPixel);
}
struct SnappedImageDrawingParameters {
// A transform from either device space or user space (depending on mResetCTM)
// to image space
gfxMatrix mUserSpaceToImageSpace;
// A device-space, pixel-aligned rectangle to fill
gfxRect mFillRect;
// A pixel rectangle in tiled image space outside of which gfx should not
// sample (using EXTEND_PAD as necessary)
nsIntRect mSubimage;
// Whether there's anything to draw at all
bool mShouldDraw;
// true iff the CTM of the rendering context needs to be reset to the
// identity matrix before drawing
bool mResetCTM;
SnappedImageDrawingParameters()
: mShouldDraw(false)
, mResetCTM(false)
{}
SnappedImageDrawingParameters(const gfxMatrix& aUserSpaceToImageSpace,
const gfxRect& aFillRect,
const nsIntRect& aSubimage,
bool aResetCTM)
: mUserSpaceToImageSpace(aUserSpaceToImageSpace)
, mFillRect(aFillRect)
, mSubimage(aSubimage)
, mShouldDraw(true)
, mResetCTM(aResetCTM)
{}
};
/**
* Given a set of input parameters, compute certain output parameters
* for drawing an image with the image snapping algorithm.
* See https://wiki.mozilla.org/Gecko:Image_Snapping_and_Rendering
*
* @see nsLayoutUtils::DrawImage() for the descriptions of input parameters
*/
static SnappedImageDrawingParameters
ComputeSnappedImageDrawingParameters(gfxContext* aCtx,
int32_t aAppUnitsPerDevPixel,
const nsRect aDest,
const nsRect aFill,
const nsPoint aAnchor,
const nsRect aDirty,
const nsIntSize aImageSize)
{
if (aDest.IsEmpty() || aFill.IsEmpty() || !aImageSize.width || !aImageSize.height)
return SnappedImageDrawingParameters();
gfxRect devPixelDest =
nsLayoutUtils::RectToGfxRect(aDest, aAppUnitsPerDevPixel);
gfxRect devPixelFill =
nsLayoutUtils::RectToGfxRect(aFill, aAppUnitsPerDevPixel);
gfxRect devPixelDirty =
nsLayoutUtils::RectToGfxRect(aDirty, aAppUnitsPerDevPixel);
gfxMatrix currentMatrix = aCtx->CurrentMatrix();
gfxRect fill = devPixelFill;
bool didSnap;
// Snap even if we have a scale in the context. But don't snap if
// we have something that's not translation+scale, or if the scale flips in
// the X or Y direction, because snapped image drawing can't handle that yet.
if (!currentMatrix.HasNonAxisAlignedTransform() &&
currentMatrix.xx > 0.0 && currentMatrix.yy > 0.0 &&
aCtx->UserToDevicePixelSnapped(fill, true)) {
didSnap = true;
if (fill.IsEmpty()) {
return SnappedImageDrawingParameters();
}
} else {
didSnap = false;
fill = devPixelFill;
}
gfxSize imageSize(aImageSize.width, aImageSize.height);
// Compute the set of pixels that would be sampled by an ideal rendering
gfxPoint subimageTopLeft =
MapToFloatImagePixels(imageSize, devPixelDest, devPixelFill.TopLeft());
gfxPoint subimageBottomRight =
MapToFloatImagePixels(imageSize, devPixelDest, devPixelFill.BottomRight());
nsIntRect intSubimage;
intSubimage.MoveTo(NSToIntFloor(subimageTopLeft.x),
NSToIntFloor(subimageTopLeft.y));
intSubimage.SizeTo(NSToIntCeil(subimageBottomRight.x) - intSubimage.x,
NSToIntCeil(subimageBottomRight.y) - intSubimage.y);
// Compute the anchor point and compute final fill rect.
// This code assumes that pixel-based devices have one pixel per
// device unit!
gfxPoint anchorPoint(gfxFloat(aAnchor.x)/aAppUnitsPerDevPixel,
gfxFloat(aAnchor.y)/aAppUnitsPerDevPixel);
gfxPoint imageSpaceAnchorPoint =
MapToFloatImagePixels(imageSize, devPixelDest, anchorPoint);
if (didSnap) {
imageSpaceAnchorPoint.Round();
anchorPoint = imageSpaceAnchorPoint;
anchorPoint = MapToFloatUserPixels(imageSize, devPixelDest, anchorPoint);
anchorPoint = currentMatrix.Transform(anchorPoint);
anchorPoint.Round();
// This form of Transform is safe to call since non-axis-aligned
// transforms wouldn't be snapped.
devPixelDirty = currentMatrix.Transform(devPixelDirty);
}
gfxFloat scaleX = imageSize.width*aAppUnitsPerDevPixel/aDest.width;
gfxFloat scaleY = imageSize.height*aAppUnitsPerDevPixel/aDest.height;
if (didSnap) {
// We'll reset aCTX to the identity matrix before drawing, so we need to
// adjust our scales to match.
scaleX /= currentMatrix.xx;
scaleY /= currentMatrix.yy;
}
gfxFloat translateX = imageSpaceAnchorPoint.x - anchorPoint.x*scaleX;
gfxFloat translateY = imageSpaceAnchorPoint.y - anchorPoint.y*scaleY;
gfxMatrix transform(scaleX, 0, 0, scaleY, translateX, translateY);
gfxRect finalFillRect = fill;
// If the user-space-to-image-space transform is not a straight
// translation by integers, then filtering will occur, and
// restricting the fill rect to the dirty rect would change the values
// computed for edge pixels, which we can't allow.
// Also, if didSnap is false then rounding out 'devPixelDirty' might not
// produce pixel-aligned coordinates, which would also break the values
// computed for edge pixels.
if (didSnap && !transform.HasNonIntegerTranslation()) {
devPixelDirty.RoundOut();
finalFillRect = fill.Intersect(devPixelDirty);
}
if (finalFillRect.IsEmpty())
return SnappedImageDrawingParameters();
return SnappedImageDrawingParameters(transform, finalFillRect, intSubimage,
didSnap);
}
static nsresult
DrawImageInternal(nsRenderingContext* aRenderingContext,
imgIContainer* aImage,
GraphicsFilter aGraphicsFilter,
const nsRect& aDest,
const nsRect& aFill,
const nsPoint& aAnchor,
const nsRect& aDirty,
const nsIntSize& aImageSize,
const SVGImageContext* aSVGContext,
uint32_t aImageFlags)
{
if (aDest.Contains(aFill)) {
aImageFlags |= imgIContainer::FLAG_CLAMP;
}
int32_t appUnitsPerDevPixel = aRenderingContext->AppUnitsPerDevPixel();
gfxContext* ctx = aRenderingContext->ThebesContext();
SnappedImageDrawingParameters drawingParams =
ComputeSnappedImageDrawingParameters(ctx, appUnitsPerDevPixel, aDest, aFill,
aAnchor, aDirty, aImageSize);
if (!drawingParams.mShouldDraw)
return NS_OK;
gfxContextMatrixAutoSaveRestore saveMatrix(ctx);
if (drawingParams.mResetCTM) {
ctx->IdentityMatrix();
}
aImage->Draw(ctx, aGraphicsFilter, drawingParams.mUserSpaceToImageSpace,
drawingParams.mFillRect, drawingParams.mSubimage, aImageSize,
aSVGContext, imgIContainer::FRAME_CURRENT, aImageFlags);
return NS_OK;
}
/* static */ void
nsLayoutUtils::DrawPixelSnapped(nsRenderingContext* aRenderingContext,
gfxDrawable* aDrawable,
GraphicsFilter aFilter,
const nsRect& aDest,
const nsRect& aFill,
const nsPoint& aAnchor,
const nsRect& aDirty)
{
int32_t appUnitsPerDevPixel = aRenderingContext->AppUnitsPerDevPixel();
gfxContext* ctx = aRenderingContext->ThebesContext();
gfxIntSize drawableSize = aDrawable->Size();
nsIntSize imageSize(drawableSize.width, drawableSize.height);
SnappedImageDrawingParameters drawingParams =
ComputeSnappedImageDrawingParameters(ctx, appUnitsPerDevPixel, aDest, aFill,
aAnchor, aDirty, imageSize);
if (!drawingParams.mShouldDraw)
return;
gfxContextMatrixAutoSaveRestore saveMatrix(ctx);
if (drawingParams.mResetCTM) {
ctx->IdentityMatrix();
}
gfxRect sourceRect =
drawingParams.mUserSpaceToImageSpace.Transform(drawingParams.mFillRect);
gfxRect imageRect(0, 0, imageSize.width, imageSize.height);
gfxRect subimage(drawingParams.mSubimage.x, drawingParams.mSubimage.y,
drawingParams.mSubimage.width, drawingParams.mSubimage.height);
NS_ASSERTION(!sourceRect.Intersect(subimage).IsEmpty(),
"We must be allowed to sample *some* source pixels!");
gfxUtils::DrawPixelSnapped(ctx, aDrawable,
drawingParams.mUserSpaceToImageSpace, subimage,
sourceRect, imageRect, drawingParams.mFillRect,
gfxASurface::ImageFormatARGB32, aFilter);
}
/* static */ nsresult
nsLayoutUtils::DrawSingleUnscaledImage(nsRenderingContext* aRenderingContext,
imgIContainer* aImage,
GraphicsFilter aGraphicsFilter,
const nsPoint& aDest,
const nsRect* aDirty,
uint32_t aImageFlags,
const nsRect* aSourceArea)
{
nsIntSize imageSize;
aImage->GetWidth(&imageSize.width);
aImage->GetHeight(&imageSize.height);
NS_ENSURE_TRUE(imageSize.width > 0 && imageSize.height > 0, NS_ERROR_FAILURE);
nscoord appUnitsPerCSSPixel = nsDeviceContext::AppUnitsPerCSSPixel();
nsSize size(imageSize.width*appUnitsPerCSSPixel,
imageSize.height*appUnitsPerCSSPixel);
nsRect source;
if (aSourceArea) {
source = *aSourceArea;
} else {
source.SizeTo(size);
}
nsRect dest(aDest - source.TopLeft(), size);
nsRect fill(aDest, source.Size());
// Ensure that only a single image tile is drawn. If aSourceArea extends
// outside the image bounds, we want to honor the aSourceArea-to-aDest
// translation but we don't want to actually tile the image.
fill.IntersectRect(fill, dest);
return DrawImageInternal(aRenderingContext, aImage, aGraphicsFilter,
dest, fill, aDest, aDirty ? *aDirty : dest,
imageSize, nullptr, aImageFlags);
}
/* static */ nsresult
nsLayoutUtils::DrawSingleImage(nsRenderingContext* aRenderingContext,
imgIContainer* aImage,
GraphicsFilter aGraphicsFilter,
const nsRect& aDest,
const nsRect& aDirty,
const SVGImageContext* aSVGContext,
uint32_t aImageFlags,
const nsRect* aSourceArea)
{
nsIntSize imageSize;
if (aImage->GetType() == imgIContainer::TYPE_VECTOR) {
imageSize.width = nsPresContext::AppUnitsToIntCSSPixels(aDest.width);
imageSize.height = nsPresContext::AppUnitsToIntCSSPixels(aDest.height);
} else {
aImage->GetWidth(&imageSize.width);
aImage->GetHeight(&imageSize.height);
}
NS_ENSURE_TRUE(imageSize.width > 0 && imageSize.height > 0, NS_ERROR_FAILURE);
nsRect source;
if (aSourceArea) {
source = *aSourceArea;
} else {
nscoord appUnitsPerCSSPixel = nsDeviceContext::AppUnitsPerCSSPixel();
source.SizeTo(imageSize.width*appUnitsPerCSSPixel,
imageSize.height*appUnitsPerCSSPixel);
}
nsRect dest = nsLayoutUtils::GetWholeImageDestination(imageSize, source,
aDest);
// Ensure that only a single image tile is drawn. If aSourceArea extends
// outside the image bounds, we want to honor the aSourceArea-to-aDest
// transform but we don't want to actually tile the image.
nsRect fill;
fill.IntersectRect(aDest, dest);
return DrawImageInternal(aRenderingContext, aImage, aGraphicsFilter, dest, fill,
fill.TopLeft(), aDirty, imageSize, aSVGContext, aImageFlags);
}
/* static */ void
nsLayoutUtils::ComputeSizeForDrawing(imgIContainer *aImage,
nsIntSize& aImageSize, /*outparam*/
nsSize& aIntrinsicRatio, /*outparam*/
bool& aGotWidth, /*outparam*/
bool& aGotHeight /*outparam*/)
{
aGotWidth = NS_SUCCEEDED(aImage->GetWidth(&aImageSize.width));
aGotHeight = NS_SUCCEEDED(aImage->GetHeight(&aImageSize.height));
bool gotRatio = NS_SUCCEEDED(aImage->GetIntrinsicRatio(&aIntrinsicRatio));
if (!(aGotWidth && aGotHeight) && !gotRatio) {
// We hit an error (say, because the image failed to load or couldn't be
// decoded) and should return zero size.
aGotWidth = aGotHeight = true;
aImageSize = nsIntSize(0, 0);
aIntrinsicRatio = nsSize(0, 0);
}
}
/* static */ nsresult
nsLayoutUtils::DrawBackgroundImage(nsRenderingContext* aRenderingContext,
imgIContainer* aImage,
const nsIntSize& aImageSize,
GraphicsFilter aGraphicsFilter,
const nsRect& aDest,
const nsRect& aFill,
const nsPoint& aAnchor,
const nsRect& aDirty,
uint32_t aImageFlags)
{
PROFILER_LABEL("layout", "nsLayoutUtils::DrawBackgroundImage");
if (UseBackgroundNearestFiltering()) {
aGraphicsFilter = gfxPattern::FILTER_NEAREST;
}
return DrawImageInternal(aRenderingContext, aImage, aGraphicsFilter,
aDest, aFill, aAnchor, aDirty,
aImageSize, nullptr, aImageFlags);
}
/* static */ nsresult
nsLayoutUtils::DrawImage(nsRenderingContext* aRenderingContext,
imgIContainer* aImage,
GraphicsFilter aGraphicsFilter,
const nsRect& aDest,
const nsRect& aFill,
const nsPoint& aAnchor,
const nsRect& aDirty,
uint32_t aImageFlags)
{
nsIntSize imageSize;
nsSize imageRatio;
bool gotHeight, gotWidth;
ComputeSizeForDrawing(aImage, imageSize, imageRatio, gotWidth, gotHeight);
// XXX Dimensionless images shouldn't fall back to filled-area size -- the
// caller should provide the image size, a la DrawBackgroundImage.
if (gotWidth != gotHeight) {
if (!gotWidth) {
if (imageRatio.height != 0) {
imageSize.width =
NSCoordSaturatingNonnegativeMultiply(imageSize.height,
float(imageRatio.width) /
float(imageRatio.height));
gotWidth = true;
}
} else {
if (imageRatio.width != 0) {
imageSize.height =
NSCoordSaturatingNonnegativeMultiply(imageSize.width,
float(imageRatio.height) /
float(imageRatio.width));
gotHeight = true;
}
}
}
if (!gotWidth) {
imageSize.width = nsPresContext::AppUnitsToIntCSSPixels(aFill.width);
}
if (!gotHeight) {
imageSize.height = nsPresContext::AppUnitsToIntCSSPixels(aFill.height);
}
return DrawImageInternal(aRenderingContext, aImage, aGraphicsFilter,
aDest, aFill, aAnchor, aDirty,
imageSize, nullptr, aImageFlags);
}
/* static */ nsRect
nsLayoutUtils::GetWholeImageDestination(const nsIntSize& aWholeImageSize,
const nsRect& aImageSourceArea,
const nsRect& aDestArea)
{
double scaleX = double(aDestArea.width)/aImageSourceArea.width;
double scaleY = double(aDestArea.height)/aImageSourceArea.height;
nscoord destOffsetX = NSToCoordRound(aImageSourceArea.x*scaleX);
nscoord destOffsetY = NSToCoordRound(aImageSourceArea.y*scaleY);
nscoord appUnitsPerCSSPixel = nsDeviceContext::AppUnitsPerCSSPixel();
nscoord wholeSizeX = NSToCoordRound(aWholeImageSize.width*appUnitsPerCSSPixel*scaleX);
nscoord wholeSizeY = NSToCoordRound(aWholeImageSize.height*appUnitsPerCSSPixel*scaleY);
return nsRect(aDestArea.TopLeft() - nsPoint(destOffsetX, destOffsetY),
nsSize(wholeSizeX, wholeSizeY));
}
static bool NonZeroStyleCoord(const nsStyleCoord& aCoord)
{
if (aCoord.IsCoordPercentCalcUnit()) {
// Since negative results are clamped to 0, check > 0.
return nsRuleNode::ComputeCoordPercentCalc(aCoord, nscoord_MAX) > 0 ||
nsRuleNode::ComputeCoordPercentCalc(aCoord, 0) > 0;
}
return true;
}
/* static */ bool
nsLayoutUtils::HasNonZeroCorner(const nsStyleCorners& aCorners)
{
NS_FOR_CSS_HALF_CORNERS(corner) {
if (NonZeroStyleCoord(aCorners.Get(corner)))
return true;
}
return false;
}
// aCorner is a "full corner" value, i.e. NS_CORNER_TOP_LEFT etc
static bool IsCornerAdjacentToSide(uint8_t aCorner, css::Side aSide)
{
PR_STATIC_ASSERT((int)NS_SIDE_TOP == NS_CORNER_TOP_LEFT);
PR_STATIC_ASSERT((int)NS_SIDE_RIGHT == NS_CORNER_TOP_RIGHT);
PR_STATIC_ASSERT((int)NS_SIDE_BOTTOM == NS_CORNER_BOTTOM_RIGHT);
PR_STATIC_ASSERT((int)NS_SIDE_LEFT == NS_CORNER_BOTTOM_LEFT);
PR_STATIC_ASSERT((int)NS_SIDE_TOP == ((NS_CORNER_TOP_RIGHT - 1)&3));
PR_STATIC_ASSERT((int)NS_SIDE_RIGHT == ((NS_CORNER_BOTTOM_RIGHT - 1)&3));
PR_STATIC_ASSERT((int)NS_SIDE_BOTTOM == ((NS_CORNER_BOTTOM_LEFT - 1)&3));
PR_STATIC_ASSERT((int)NS_SIDE_LEFT == ((NS_CORNER_TOP_LEFT - 1)&3));
return aSide == aCorner || aSide == ((aCorner - 1)&3);
}
/* static */ bool
nsLayoutUtils::HasNonZeroCornerOnSide(const nsStyleCorners& aCorners,
css::Side aSide)
{
PR_STATIC_ASSERT(NS_CORNER_TOP_LEFT_X/2 == NS_CORNER_TOP_LEFT);
PR_STATIC_ASSERT(NS_CORNER_TOP_LEFT_Y/2 == NS_CORNER_TOP_LEFT);
PR_STATIC_ASSERT(NS_CORNER_TOP_RIGHT_X/2 == NS_CORNER_TOP_RIGHT);
PR_STATIC_ASSERT(NS_CORNER_TOP_RIGHT_Y/2 == NS_CORNER_TOP_RIGHT);
PR_STATIC_ASSERT(NS_CORNER_BOTTOM_RIGHT_X/2 == NS_CORNER_BOTTOM_RIGHT);
PR_STATIC_ASSERT(NS_CORNER_BOTTOM_RIGHT_Y/2 == NS_CORNER_BOTTOM_RIGHT);
PR_STATIC_ASSERT(NS_CORNER_BOTTOM_LEFT_X/2 == NS_CORNER_BOTTOM_LEFT);
PR_STATIC_ASSERT(NS_CORNER_BOTTOM_LEFT_Y/2 == NS_CORNER_BOTTOM_LEFT);
NS_FOR_CSS_HALF_CORNERS(corner) {
// corner is a "half corner" value, so dividing by two gives us a
// "full corner" value.
if (NonZeroStyleCoord(aCorners.Get(corner)) &&
IsCornerAdjacentToSide(corner/2, aSide))
return true;
}
return false;
}
/* static */ nsTransparencyMode
nsLayoutUtils::GetFrameTransparency(nsIFrame* aBackgroundFrame,
nsIFrame* aCSSRootFrame) {
if (aCSSRootFrame->StyleDisplay()->mOpacity < 1.0f)
return eTransparencyTransparent;
if (HasNonZeroCorner(aCSSRootFrame->StyleBorder()->mBorderRadius))
return eTransparencyTransparent;
if (aCSSRootFrame->StyleDisplay()->mAppearance == NS_THEME_WIN_GLASS)
return eTransparencyGlass;
if (aCSSRootFrame->StyleDisplay()->mAppearance == NS_THEME_WIN_BORDERLESS_GLASS)
return eTransparencyBorderlessGlass;
nsITheme::Transparency transparency;
if (aCSSRootFrame->IsThemed(&transparency))
return transparency == nsITheme::eTransparent
? eTransparencyTransparent
: eTransparencyOpaque;
// We need an uninitialized window to be treated as opaque because
// doing otherwise breaks window display effects on some platforms,
// specifically Vista. (bug 450322)
if (aBackgroundFrame->GetType() == nsGkAtoms::viewportFrame &&
!aBackgroundFrame->GetFirstPrincipalChild()) {
return eTransparencyOpaque;
}
nsStyleContext* bgSC;
if (!nsCSSRendering::FindBackground(aBackgroundFrame, &bgSC)) {
return eTransparencyTransparent;
}
const nsStyleBackground* bg = bgSC->StyleBackground();
if (NS_GET_A(bg->mBackgroundColor) < 255 ||
// bottom layer's clip is used for the color
bg->BottomLayer().mClip != NS_STYLE_BG_CLIP_BORDER)
return eTransparencyTransparent;
return eTransparencyOpaque;
}
static bool IsPopupFrame(nsIFrame* aFrame)
{
// aFrame is a popup it's the list control frame dropdown for a combobox.
nsIAtom* frameType = aFrame->GetType();
if (frameType == nsGkAtoms::listControlFrame) {
nsListControlFrame* lcf = static_cast<nsListControlFrame*>(aFrame);
return lcf->IsInDropDownMode();
}
// ... or if it's a XUL menupopup frame.
return frameType == nsGkAtoms::menuPopupFrame;
}
/* static */ bool
nsLayoutUtils::IsPopup(nsIFrame* aFrame)
{
// Optimization: the frame can't possibly be a popup if it has no view.
if (!aFrame->HasView()) {
NS_ASSERTION(!IsPopupFrame(aFrame), "popup frame must have a view");
return false;
}
return IsPopupFrame(aFrame);
}
/* static */ nsIFrame*
nsLayoutUtils::GetDisplayRootFrame(nsIFrame* aFrame)
{
// We could use GetRootPresContext() here if the
// NS_FRAME_IN_POPUP frame bit is set.
nsIFrame* f = aFrame;
for (;;) {
if (!f->HasAnyStateBits(NS_FRAME_IN_POPUP)) {
f = f->PresContext()->FrameManager()->GetRootFrame();
} else if (IsPopup(f)) {
return f;
}
nsIFrame* parent = GetCrossDocParentFrame(f);
if (!parent)
return f;
f = parent;
}
}
/* static */ uint32_t
nsLayoutUtils::GetTextRunFlagsForStyle(nsStyleContext* aStyleContext,
const nsStyleFont* aStyleFont,
nscoord aLetterSpacing)
{
uint32_t result = 0;
if (aLetterSpacing != 0) {
result |= gfxTextRunFactory::TEXT_DISABLE_OPTIONAL_LIGATURES;
}
switch (aStyleContext->StyleSVG()->mTextRendering) {
case NS_STYLE_TEXT_RENDERING_OPTIMIZESPEED:
result |= gfxTextRunFactory::TEXT_OPTIMIZE_SPEED;
break;
case NS_STYLE_TEXT_RENDERING_AUTO:
if (aStyleFont->mFont.size <
aStyleContext->PresContext()->GetAutoQualityMinFontSize()) {
result |= gfxTextRunFactory::TEXT_OPTIMIZE_SPEED;
}
break;
default:
break;
}
return result;
}
/* static */ void
nsLayoutUtils::GetRectDifferenceStrips(const nsRect& aR1, const nsRect& aR2,
nsRect* aHStrip, nsRect* aVStrip) {
NS_ASSERTION(aR1.TopLeft() == aR2.TopLeft(),
"expected rects at the same position");
nsRect unionRect(aR1.x, aR1.y, std::max(aR1.width, aR2.width),
std::max(aR1.height, aR2.height));
nscoord VStripStart = std::min(aR1.width, aR2.width);
nscoord HStripStart = std::min(aR1.height, aR2.height);
*aVStrip = unionRect;
aVStrip->x += VStripStart;
aVStrip->width -= VStripStart;
*aHStrip = unionRect;
aHStrip->y += HStripStart;
aHStrip->height -= HStripStart;
}
nsDeviceContext*
nsLayoutUtils::GetDeviceContextForScreenInfo(nsPIDOMWindow* aWindow)
{
if (!aWindow) {
return nullptr;
}
nsCOMPtr<nsIDocShell> docShell = aWindow->GetDocShell();
while (docShell) {
// Now make sure our size is up to date. That will mean that the device
// context does the right thing on multi-monitor systems when we return it to
// the caller. It will also make sure that our prescontext has been created,
// if we're supposed to have one.
nsCOMPtr<nsPIDOMWindow> win = do_GetInterface(docShell);
if (!win) {
// No reason to go on
return nullptr;
}
win->EnsureSizeUpToDate();
nsRefPtr<nsPresContext> presContext;
docShell->GetPresContext(getter_AddRefs(presContext));
if (presContext) {
nsDeviceContext* context = presContext->DeviceContext();
if (context) {
return context;
}
}
nsCOMPtr<nsIDocShellTreeItem> parentItem;
docShell->GetParent(getter_AddRefs(parentItem));
docShell = do_QueryInterface(parentItem);
}
return nullptr;
}
/* static */ bool
nsLayoutUtils::IsReallyFixedPos(nsIFrame* aFrame)
{
NS_PRECONDITION(aFrame->GetParent(),
"IsReallyFixedPos called on frame not in tree");
NS_PRECONDITION(aFrame->StyleDisplay()->mPosition ==
NS_STYLE_POSITION_FIXED,
"IsReallyFixedPos called on non-'position:fixed' frame");
nsIAtom *parentType = aFrame->GetParent()->GetType();
return parentType == nsGkAtoms::viewportFrame ||
parentType == nsGkAtoms::pageContentFrame;
}
nsLayoutUtils::SurfaceFromElementResult
nsLayoutUtils::SurfaceFromElement(nsIImageLoadingContent* aElement,
uint32_t aSurfaceFlags)
{
SurfaceFromElementResult result;
nsresult rv;
bool forceCopy = (aSurfaceFlags & SFE_WANT_NEW_SURFACE) != 0;
bool wantImageSurface = (aSurfaceFlags & SFE_WANT_IMAGE_SURFACE) != 0;
bool premultAlpha = (aSurfaceFlags & SFE_NO_PREMULTIPLY_ALPHA) == 0;
if (!premultAlpha) {
forceCopy = true;
wantImageSurface = true;
}
// Push a null JSContext on the stack so that code that runs within
// the below code doesn't think it's being called by JS. See bug
// 604262.
nsCxPusher pusher;
pusher.PushNull();
nsCOMPtr<imgIRequest> imgRequest;
rv = aElement->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST,
getter_AddRefs(imgRequest));
if (NS_FAILED(rv) || !imgRequest)
return result;
uint32_t status;
imgRequest->GetImageStatus(&status);
if ((status & imgIRequest::STATUS_LOAD_COMPLETE) == 0) {
// Spec says to use GetComplete, but that only works on
// nsIDOMHTMLImageElement, and we support all sorts of other stuff
// here. Do this for now pending spec clarification.
result.mIsStillLoading = (status & imgIRequest::STATUS_ERROR) == 0;
return result;
}
nsCOMPtr<nsIPrincipal> principal;
rv = imgRequest->GetImagePrincipal(getter_AddRefs(principal));
if (NS_FAILED(rv))
return result;
nsCOMPtr<imgIContainer> imgContainer;
rv = imgRequest->GetImage(getter_AddRefs(imgContainer));
if (NS_FAILED(rv))
return result;
uint32_t whichFrame = (aSurfaceFlags & SFE_WANT_FIRST_FRAME)
? (uint32_t) imgIContainer::FRAME_FIRST
: (uint32_t) imgIContainer::FRAME_CURRENT;
uint32_t frameFlags = imgIContainer::FLAG_SYNC_DECODE;
if (aSurfaceFlags & SFE_NO_COLORSPACE_CONVERSION)
frameFlags |= imgIContainer::FLAG_DECODE_NO_COLORSPACE_CONVERSION;
if (aSurfaceFlags & SFE_NO_PREMULTIPLY_ALPHA)
frameFlags |= imgIContainer::FLAG_DECODE_NO_PREMULTIPLY_ALPHA;
nsRefPtr<gfxASurface> framesurf;
rv = imgContainer->GetFrame(whichFrame,
frameFlags,
getter_AddRefs(framesurf));
if (NS_FAILED(rv))
return result;
int32_t imgWidth, imgHeight;
rv = imgContainer->GetWidth(&imgWidth);
nsresult rv2 = imgContainer->GetHeight(&imgHeight);
if (NS_FAILED(rv) || NS_FAILED(rv2))
return result;
if (wantImageSurface && framesurf->GetType() != gfxASurface::SurfaceTypeImage) {
forceCopy = true;
}
nsRefPtr<gfxASurface> gfxsurf = framesurf;
if (forceCopy) {
if (wantImageSurface) {
gfxsurf = new gfxImageSurface (gfxIntSize(imgWidth, imgHeight), gfxASurface::ImageFormatARGB32);
} else {
gfxsurf = gfxPlatform::GetPlatform()->CreateOffscreenSurface(gfxIntSize(imgWidth, imgHeight),
gfxASurface::CONTENT_COLOR_ALPHA);
}
nsRefPtr<gfxContext> ctx = new gfxContext(gfxsurf);
ctx->SetOperator(gfxContext::OPERATOR_SOURCE);
ctx->SetSource(framesurf);
ctx->Paint();
}
int32_t corsmode;
if (NS_SUCCEEDED(imgRequest->GetCORSMode(&corsmode))) {
result.mCORSUsed = (corsmode != imgIRequest::CORS_NONE);
}
result.mSurface = gfxsurf;
result.mSize = gfxIntSize(imgWidth, imgHeight);
result.mPrincipal = principal.forget();
// no images, including SVG images, can load content from another domain.
result.mIsWriteOnly = false;
result.mImageRequest = imgRequest.forget();
return result;
}
nsLayoutUtils::SurfaceFromElementResult
nsLayoutUtils::SurfaceFromElement(HTMLImageElement *aElement,
uint32_t aSurfaceFlags)
{
return SurfaceFromElement(static_cast<nsIImageLoadingContent*>(aElement),
aSurfaceFlags);
}
nsLayoutUtils::SurfaceFromElementResult
nsLayoutUtils::SurfaceFromElement(HTMLCanvasElement* aElement,
uint32_t aSurfaceFlags)
{
SurfaceFromElementResult result;
nsresult rv;
bool forceCopy = (aSurfaceFlags & SFE_WANT_NEW_SURFACE) != 0;
bool wantImageSurface = (aSurfaceFlags & SFE_WANT_IMAGE_SURFACE) != 0;
bool premultAlpha = (aSurfaceFlags & SFE_NO_PREMULTIPLY_ALPHA) == 0;
if (!premultAlpha) {
forceCopy = true;
wantImageSurface = true;
}
gfxIntSize size = aElement->GetSize();
nsRefPtr<gfxASurface> surf;
if (!forceCopy && aElement->CountContexts() == 1) {
nsICanvasRenderingContextInternal *srcCanvas = aElement->GetContextAtIndex(0);
rv = srcCanvas->GetThebesSurface(getter_AddRefs(surf));
if (NS_FAILED(rv))
surf = nullptr;
}
if (surf && wantImageSurface && surf->GetType() != gfxASurface::SurfaceTypeImage)
surf = nullptr;
if (!surf) {
if (wantImageSurface) {
surf = new gfxImageSurface(size, gfxASurface::ImageFormatARGB32);
} else {
surf = gfxPlatform::GetPlatform()->CreateOffscreenSurface(size, gfxASurface::CONTENT_COLOR_ALPHA);
}
if (!surf)
return result;
nsRefPtr<gfxContext> ctx = new gfxContext(surf);
// XXX shouldn't use the external interface, but maybe we can layerify this
uint32_t flags = premultAlpha ? HTMLCanvasElement::RenderFlagPremultAlpha : 0;
rv = aElement->RenderContextsExternal(ctx, gfxPattern::FILTER_NEAREST, flags);
if (NS_FAILED(rv))
return result;
}
// Ensure that any future changes to the canvas trigger proper invalidation,
// in case this is being used by -moz-element()
aElement->MarkContextClean();
result.mSurface = surf;
result.mSize = size;
result.mPrincipal = aElement->NodePrincipal();
result.mIsWriteOnly = aElement->IsWriteOnly();
return result;
}
nsLayoutUtils::SurfaceFromElementResult
nsLayoutUtils::SurfaceFromElement(HTMLVideoElement* aElement,
uint32_t aSurfaceFlags)
{
SurfaceFromElementResult result;
bool wantImageSurface = (aSurfaceFlags & SFE_WANT_IMAGE_SURFACE) != 0;
bool premultAlpha = (aSurfaceFlags & SFE_NO_PREMULTIPLY_ALPHA) == 0;
if (!premultAlpha) {
wantImageSurface = true;
}
uint16_t readyState;
if (NS_SUCCEEDED(aElement->GetReadyState(&readyState)) &&
(readyState == nsIDOMHTMLMediaElement::HAVE_NOTHING ||
readyState == nsIDOMHTMLMediaElement::HAVE_METADATA)) {
result.mIsStillLoading = true;
return result;
}
// If it doesn't have a principal, just bail
nsCOMPtr<nsIPrincipal> principal = aElement->GetCurrentPrincipal();
if (!principal)
return result;
ImageContainer *container = aElement->GetImageContainer();
if (!container)
return result;
gfxIntSize size;
nsRefPtr<gfxASurface> surf = container->GetCurrentAsSurface(&size);
if (!surf)
return result;
if (wantImageSurface && surf->GetType() != gfxASurface::SurfaceTypeImage) {
nsRefPtr<gfxImageSurface> imgSurf =
new gfxImageSurface(size, gfxASurface::ImageFormatARGB32);
nsRefPtr<gfxContext> ctx = new gfxContext(imgSurf);
ctx->SetOperator(gfxContext::OPERATOR_SOURCE);
ctx->DrawSurface(surf, size);
surf = imgSurf;
}
result.mCORSUsed = aElement->GetCORSMode() != CORS_NONE;
result.mSurface = surf;
result.mSize = size;
result.mPrincipal = principal.forget();
result.mIsWriteOnly = false;
return result;
}
nsLayoutUtils::SurfaceFromElementResult
nsLayoutUtils::SurfaceFromElement(dom::Element* aElement,
uint32_t aSurfaceFlags)
{
// If it's a <canvas>, we may be able to just grab its internal surface
if (HTMLCanvasElement* canvas =
HTMLCanvasElement::FromContentOrNull(aElement)) {
return SurfaceFromElement(canvas, aSurfaceFlags);
}
// Maybe it's <video>?
if (HTMLVideoElement* video =
HTMLVideoElement::FromContentOrNull(aElement)) {
return SurfaceFromElement(video, aSurfaceFlags);
}
// Finally, check if it's a normal image
nsCOMPtr<nsIImageLoadingContent> imageLoader = do_QueryInterface(aElement);
if (!imageLoader) {
return SurfaceFromElementResult();
}
return SurfaceFromElement(imageLoader, aSurfaceFlags);
}
/* static */
nsIContent*
nsLayoutUtils::GetEditableRootContentByContentEditable(nsIDocument* aDocument)
{
// If the document is in designMode we should return NULL.
if (!aDocument || aDocument->HasFlag(NODE_IS_EDITABLE)) {
return nullptr;
}
// contenteditable only works with HTML document.
// Note: Use nsIDOMHTMLDocument rather than nsIHTMLDocument for getting the
// body node because nsIDOMHTMLDocument::GetBody() does something
// additional work for some cases and nsEditor uses them.
nsCOMPtr<nsIDOMHTMLDocument> domHTMLDoc = do_QueryInterface(aDocument);
if (!domHTMLDoc) {
return nullptr;
}
Element* rootElement = aDocument->GetRootElement();
if (rootElement && rootElement->IsEditable()) {
return rootElement;
}
// If there are no editable root element, check its <body> element.
// Note that the body element could be <frameset> element.
nsCOMPtr<nsIDOMHTMLElement> body;
nsresult rv = domHTMLDoc->GetBody(getter_AddRefs(body));
nsCOMPtr<nsIContent> content = do_QueryInterface(body);
if (NS_SUCCEEDED(rv) && content && content->IsEditable()) {
return content;
}
return nullptr;
}
#ifdef DEBUG
/* static */ void
nsLayoutUtils::AssertNoDuplicateContinuations(nsIFrame* aContainer,
const nsFrameList& aFrameList)
{
for (nsIFrame* f = aFrameList.FirstChild(); f ; f = f->GetNextSibling()) {
// Check only later continuations of f; we deal with checking the
// earlier continuations when we hit those earlier continuations in
// the frame list.
for (nsIFrame *c = f; (c = c->GetNextInFlow());) {
NS_ASSERTION(c->GetParent() != aContainer ||
!aFrameList.ContainsFrame(c),
"Two continuations of the same frame in the same "
"frame list");
}
}
}
// Is one of aFrame's ancestors a letter frame?
static bool
IsInLetterFrame(nsIFrame *aFrame)
{
for (nsIFrame *f = aFrame->GetParent(); f; f = f->GetParent()) {
if (f->GetType() == nsGkAtoms::letterFrame) {
return true;
}
}
return false;
}
/* static */ void
nsLayoutUtils::AssertTreeOnlyEmptyNextInFlows(nsIFrame *aSubtreeRoot)
{
NS_ASSERTION(aSubtreeRoot->GetPrevInFlow(),
"frame tree not empty, but caller reported complete status");
// Also assert that text frames map no text.
int32_t start, end;
nsresult rv = aSubtreeRoot->GetOffsets(start, end);
NS_ASSERTION(NS_SUCCEEDED(rv), "GetOffsets failed");
// In some cases involving :first-letter, we'll partially unlink a
// continuation in the middle of a continuation chain from its
// previous and next continuations before destroying it, presumably so
// that we don't also destroy the later continuations. Once we've
// done this, GetOffsets returns incorrect values.
// For examples, see list of tests in
// https://bugzilla.mozilla.org/show_bug.cgi?id=619021#c29
NS_ASSERTION(start == end || IsInLetterFrame(aSubtreeRoot),
"frame tree not empty, but caller reported complete status");
nsIFrame::ChildListIterator lists(aSubtreeRoot);
for (; !lists.IsDone(); lists.Next()) {
nsFrameList::Enumerator childFrames(lists.CurrentList());
for (; !childFrames.AtEnd(); childFrames.Next()) {
nsLayoutUtils::AssertTreeOnlyEmptyNextInFlows(childFrames.get());
}
}
}
#endif
/* static */
nsresult
nsLayoutUtils::GetFontFacesForFrames(nsIFrame* aFrame,
nsFontFaceList* aFontFaceList)
{
NS_PRECONDITION(aFrame, "NULL frame pointer");
if (aFrame->GetType() == nsGkAtoms::textFrame) {
return GetFontFacesForText(aFrame, 0, INT32_MAX, false,
aFontFaceList);
}
while (aFrame) {
nsIFrame::ChildListID childLists[] = { nsIFrame::kPrincipalList,
nsIFrame::kPopupList };
for (size_t i = 0; i < ArrayLength(childLists); ++i) {
nsFrameList children(aFrame->GetChildList(childLists[i]));
for (nsFrameList::Enumerator e(children); !e.AtEnd(); e.Next()) {
nsIFrame* child = e.get();
if (child->GetPrevContinuation()) {
continue;
}
child = nsPlaceholderFrame::GetRealFrameFor(child);
nsresult rv = GetFontFacesForFrames(child, aFontFaceList);
NS_ENSURE_SUCCESS(rv, rv);
}
}
aFrame = GetNextContinuationOrSpecialSibling(aFrame);
}
return NS_OK;
}
/* static */
nsresult
nsLayoutUtils::GetFontFacesForText(nsIFrame* aFrame,
int32_t aStartOffset, int32_t aEndOffset,
bool aFollowContinuations,
nsFontFaceList* aFontFaceList)
{
NS_PRECONDITION(aFrame, "NULL frame pointer");
if (aFrame->GetType() != nsGkAtoms::textFrame) {
return NS_OK;
}
nsTextFrame* curr = static_cast<nsTextFrame*>(aFrame);
do {
int32_t fstart = std::max(curr->GetContentOffset(), aStartOffset);
int32_t fend = std::min(curr->GetContentEnd(), aEndOffset);
if (fstart >= fend) {
continue;
}
// overlapping with the offset we want
gfxSkipCharsIterator iter = curr->EnsureTextRun(nsTextFrame::eInflated);
gfxTextRun* textRun = curr->GetTextRun(nsTextFrame::eInflated);
NS_ENSURE_TRUE(textRun, NS_ERROR_OUT_OF_MEMORY);
uint32_t skipStart = iter.ConvertOriginalToSkipped(fstart);
uint32_t skipEnd = iter.ConvertOriginalToSkipped(fend);
aFontFaceList->AddFontsFromTextRun(textRun,
skipStart,
skipEnd - skipStart,
curr);
} while (aFollowContinuations &&
(curr = static_cast<nsTextFrame*>(curr->GetNextContinuation())));
return NS_OK;
}
/* static */
size_t
nsLayoutUtils::SizeOfTextRunsForFrames(nsIFrame* aFrame,
nsMallocSizeOfFun aMallocSizeOf,
bool clear)
{
NS_PRECONDITION(aFrame, "NULL frame pointer");
size_t total = 0;
if (aFrame->GetType() == nsGkAtoms::textFrame) {
nsTextFrame* textFrame = static_cast<nsTextFrame*>(aFrame);
for (uint32_t i = 0; i < 2; ++i) {
gfxTextRun *run = textFrame->GetTextRun(
(i != 0) ? nsTextFrame::eInflated : nsTextFrame::eNotInflated);
if (run) {
if (clear) {
run->ResetSizeOfAccountingFlags();
} else {
total += run->MaybeSizeOfIncludingThis(aMallocSizeOf);
}
}
}
return total;
}
nsAutoTArray<nsIFrame::ChildList,4> childListArray;
aFrame->GetChildLists(&childListArray);
for (nsIFrame::ChildListArrayIterator childLists(childListArray);
!childLists.IsDone(); childLists.Next()) {
for (nsFrameList::Enumerator e(childLists.CurrentList());
!e.AtEnd(); e.Next()) {
total += SizeOfTextRunsForFrames(e.get(), aMallocSizeOf, clear);
}
}
return total;
}
/* static */
void
nsLayoutUtils::Initialize()
{
Preferences::AddUintVarCache(&sFontSizeInflationMaxRatio,
"font.size.inflation.maxRatio");
Preferences::AddUintVarCache(&sFontSizeInflationEmPerLine,
"font.size.inflation.emPerLine");
Preferences::AddUintVarCache(&sFontSizeInflationMinTwips,
"font.size.inflation.minTwips");
Preferences::AddUintVarCache(&sFontSizeInflationLineThreshold,
"font.size.inflation.lineThreshold");
Preferences::AddIntVarCache(&sFontSizeInflationMappingIntercept,
"font.size.inflation.mappingIntercept");
Preferences::AddBoolVarCache(&sFontSizeInflationForceEnabled,
"font.size.inflation.forceEnabled");
Preferences::AddBoolVarCache(&sFontSizeInflationDisabledInMasterProcess,
"font.size.inflation.disabledInMasterProcess");
Preferences::AddBoolVarCache(&sInvalidationDebuggingIsEnabled,
"nglayout.debug.invalidation");
Preferences::RegisterCallback(FlexboxEnabledPrefChangeCallback,
FLEXBOX_ENABLED_PREF_NAME);
FlexboxEnabledPrefChangeCallback(FLEXBOX_ENABLED_PREF_NAME, nullptr);
}
/* static */
void
nsLayoutUtils::Shutdown()
{
if (sContentMap) {
delete sContentMap;
sContentMap = nullptr;
}
Preferences::UnregisterCallback(FlexboxEnabledPrefChangeCallback,
FLEXBOX_ENABLED_PREF_NAME);
}
/* static */
void
nsLayoutUtils::RegisterImageRequest(nsPresContext* aPresContext,
imgIRequest* aRequest,
bool* aRequestRegistered)
{
if (!aPresContext) {
return;
}
if (aRequestRegistered && *aRequestRegistered) {
// Our request is already registered with the refresh driver, so
// no need to register it again.
return;
}
if (aRequest) {
if (!aPresContext->RefreshDriver()->AddImageRequest(aRequest)) {
NS_WARNING("Unable to add image request");
return;
}
if (aRequestRegistered) {
*aRequestRegistered = true;
}
}
}
/* static */
void
nsLayoutUtils::RegisterImageRequestIfAnimated(nsPresContext* aPresContext,
imgIRequest* aRequest,
bool* aRequestRegistered)
{
if (!aPresContext) {
return;
}
if (aRequestRegistered && *aRequestRegistered) {
// Our request is already registered with the refresh driver, so
// no need to register it again.
return;
}
if (aRequest) {
nsCOMPtr<imgIContainer> image;
if (NS_SUCCEEDED(aRequest->GetImage(getter_AddRefs(image)))) {
// Check to verify that the image is animated. If so, then add it to the
// list of images tracked by the refresh driver.
bool isAnimated = false;
nsresult rv = image->GetAnimated(&isAnimated);
if (NS_SUCCEEDED(rv) && isAnimated) {
if (!aPresContext->RefreshDriver()->AddImageRequest(aRequest)) {
NS_WARNING("Unable to add image request");
return;
}
if (aRequestRegistered) {
*aRequestRegistered = true;
}
}
}
}
}
/* static */
void
nsLayoutUtils::DeregisterImageRequest(nsPresContext* aPresContext,
imgIRequest* aRequest,
bool* aRequestRegistered)
{
if (!aPresContext) {
return;
}
// Deregister our imgIRequest with the refresh driver to
// complete tear-down, but only if it has been registered
if (aRequestRegistered && !*aRequestRegistered) {
return;
}
if (aRequest) {
nsCOMPtr<imgIContainer> image;
if (NS_SUCCEEDED(aRequest->GetImage(getter_AddRefs(image)))) {
aPresContext->RefreshDriver()->RemoveImageRequest(aRequest);
if (aRequestRegistered) {
*aRequestRegistered = false;
}
}
}
}
/* static */
void
nsLayoutUtils::PostRestyleEvent(Element* aElement,
nsRestyleHint aRestyleHint,
nsChangeHint aMinChangeHint)
{
nsIDocument* doc = aElement->GetCurrentDoc();
if (doc) {
nsCOMPtr<nsIPresShell> presShell = doc->GetShell();
if (presShell) {
presShell->FrameConstructor()->PostRestyleEvent(
aElement, aRestyleHint, aMinChangeHint);
}
}
}
nsSetAttrRunnable::nsSetAttrRunnable(nsIContent* aContent, nsIAtom* aAttrName,
const nsAString& aValue)
: mContent(aContent),
mAttrName(aAttrName),
mValue(aValue)
{
NS_ASSERTION(aContent && aAttrName, "Missing stuff, prepare to crash");
}
nsSetAttrRunnable::nsSetAttrRunnable(nsIContent* aContent, nsIAtom* aAttrName,
int32_t aValue)
: mContent(aContent),
mAttrName(aAttrName)
{
NS_ASSERTION(aContent && aAttrName, "Missing stuff, prepare to crash");
mValue.AppendInt(aValue);
}
NS_IMETHODIMP
nsSetAttrRunnable::Run()
{
return mContent->SetAttr(kNameSpaceID_None, mAttrName, mValue, true);
}
nsUnsetAttrRunnable::nsUnsetAttrRunnable(nsIContent* aContent,
nsIAtom* aAttrName)
: mContent(aContent),
mAttrName(aAttrName)
{
NS_ASSERTION(aContent && aAttrName, "Missing stuff, prepare to crash");
}
NS_IMETHODIMP
nsUnsetAttrRunnable::Run()
{
return mContent->UnsetAttr(kNameSpaceID_None, mAttrName, true);
}
nsReflowFrameRunnable::nsReflowFrameRunnable(nsIFrame* aFrame,
nsIPresShell::IntrinsicDirty aIntrinsicDirty,
nsFrameState aBitToAdd)
: mWeakFrame(aFrame),
mIntrinsicDirty(aIntrinsicDirty),
mBitToAdd(aBitToAdd)
{
}
NS_IMETHODIMP
nsReflowFrameRunnable::Run()
{
if (mWeakFrame.IsAlive()) {
mWeakFrame->PresContext()->PresShell()->
FrameNeedsReflow(mWeakFrame, mIntrinsicDirty, mBitToAdd);
}
return NS_OK;
}
/**
* Compute the minimum font size inside of a container with the given
* width, such that **when the user zooms the container to fill the full
* width of the device**, the fonts satisfy our minima.
*/
static nscoord
MinimumFontSizeFor(nsPresContext* aPresContext, nscoord aContainerWidth)
{
nsIPresShell* presShell = aPresContext->PresShell();
uint32_t emPerLine = presShell->FontSizeInflationEmPerLine();
uint32_t minTwips = presShell->FontSizeInflationMinTwips();
if (emPerLine == 0 && minTwips == 0) {
return 0;
}
// Clamp the container width to the device dimensions
nscoord iFrameWidth = aPresContext->GetVisibleArea().width;
nscoord effectiveContainerWidth = std::min(iFrameWidth, aContainerWidth);
nscoord byLine = 0, byInch = 0;
if (emPerLine != 0) {
byLine = effectiveContainerWidth / emPerLine;
}
if (minTwips != 0) {
// REVIEW: Is this giving us app units and sizes *not* counting
// viewport scaling?
float deviceWidthInches =
aPresContext->ScreenWidthInchesForFontInflation();
byInch = NSToCoordRound(effectiveContainerWidth /
(deviceWidthInches * 1440 /
minTwips ));
}
return std::max(byLine, byInch);
}
/* static */ float
nsLayoutUtils::FontSizeInflationInner(const nsIFrame *aFrame,
nscoord aMinFontSize)
{
// Note that line heights should be inflated by the same ratio as the
// font size of the same text; thus we operate only on the font size
// even when we're scaling a line height.
nscoord styleFontSize = aFrame->StyleFont()->mFont.size;
if (styleFontSize <= 0) {
// Never scale zero font size.
return 1.0;
}
if (aMinFontSize <= 0) {
// No need to scale.
return 1.0;
}
// If between this current frame and its font inflation container there is a
// non-inline element with fixed width or height, then we should not inflate
// fonts for this frame.
for (const nsIFrame* f = aFrame;
f && !IsContainerForFontSizeInflation(f);
f = f->GetParent()) {
nsIContent* content = f->GetContent();
nsIAtom* fType = f->GetType();
// Also, if there is more than one frame corresponding to a single
// content node, we want the outermost one.
if (!(f->GetParent() && f->GetParent()->GetContent() == content) &&
// ignore width/height on inlines since they don't apply
fType != nsGkAtoms::inlineFrame &&
// ignore width on radios and checkboxes since we enlarge them and
// they have width/height in ua.css
fType != nsGkAtoms::formControlFrame) {
nsStyleCoord stylePosWidth = f->StylePosition()->mWidth;
nsStyleCoord stylePosHeight = f->StylePosition()->mHeight;
if (stylePosWidth.GetUnit() != eStyleUnit_Auto ||
stylePosHeight.GetUnit() != eStyleUnit_Auto) {
return 1.0;
}
}
}
int32_t interceptParam = nsLayoutUtils::FontSizeInflationMappingIntercept();
float maxRatio = (float)nsLayoutUtils::FontSizeInflationMaxRatio() / 100.0f;
float ratio = float(styleFontSize) / float(aMinFontSize);
float inflationRatio;
// Given a minimum inflated font size m, a specified font size s, we want to
// find the inflated font size i and then return the ratio of i to s (i/s).
if (interceptParam >= 0) {
// Since the mapping intercept parameter P is greater than zero, we use it
// to determine the point where our mapping function intersects the i=s
// line. This means that we have an equation of the form:
//
// i = m + s·(P/2)/(1 + P/2), if s <= (1 + P/2)·m
// i = s, if s >= (1 + P/2)·m
float intercept = 1 + float(interceptParam)/2.0f;
if (ratio >= intercept) {
// If we're already at 1+P/2 or more times the minimum, don't scale.
return 1.0;
}
// The point (intercept, intercept) is where the part of the i vs. s graph
// that's not slope 1 meets the i=s line. (This part of the
// graph is a line from (0, m), to that point). We calculate the
// intersection point to be ((1+P/2)m, (1+P/2)m), where P is the
// intercept parameter above. We then need to return i/s.
inflationRatio = (1.0f + (ratio * (intercept - 1) / intercept)) / ratio;
} else {
// This is the case where P is negative. We essentially want to implement
// the case for P=infinity here, so we make i = s + m, which means that
// i/s = s/s + m/s = 1 + 1/ratio
inflationRatio = 1 + 1.0f / ratio;
}
if (maxRatio > 1.0 && inflationRatio > maxRatio) {
return maxRatio;
} else {
return inflationRatio;
}
}
static bool
ShouldInflateFontsForContainer(const nsIFrame *aFrame)
{
// We only want to inflate fonts for text that is in a place
// with room to expand. The question is what the best heuristic for
// that is...
// For now, we're going to use NS_FRAME_IN_CONSTRAINED_HEIGHT, which
// indicates whether the frame is inside something with a constrained
// height (propagating down the tree), but the propagation stops when
// we hit overflow-y: scroll or auto.
const nsStyleText* styleText = aFrame->StyleText();
return styleText->mTextSizeAdjust != NS_STYLE_TEXT_SIZE_ADJUST_NONE &&
!(aFrame->GetStateBits() & NS_FRAME_IN_CONSTRAINED_HEIGHT) &&
// We also want to disable font inflation for containers that have
// preformatted text.
styleText->WhiteSpaceCanWrap(aFrame);
}
nscoord
nsLayoutUtils::InflationMinFontSizeFor(const nsIFrame *aFrame)
{
nsPresContext *presContext = aFrame->PresContext();
if (!FontSizeInflationEnabled(presContext) ||
presContext->mInflationDisabledForShrinkWrap) {
return 0;
}
for (const nsIFrame *f = aFrame; f; f = f->GetParent()) {
if (IsContainerForFontSizeInflation(f)) {
if (!ShouldInflateFontsForContainer(f)) {
return 0;
}
nsFontInflationData *data =
nsFontInflationData::FindFontInflationDataFor(aFrame);
// FIXME: The need to null-check here is sort of a bug, and might
// lead to incorrect results.
if (!data || !data->InflationEnabled()) {
return 0;
}
return MinimumFontSizeFor(aFrame->PresContext(),
data->EffectiveWidth());
}
}
NS_ABORT_IF_FALSE(false, "root should always be container");
return 0;
}
float
nsLayoutUtils::FontSizeInflationFor(const nsIFrame *aFrame)
{
if (aFrame->IsSVGText()) {
const nsIFrame* container = aFrame;
while (container->GetType() != nsGkAtoms::svgTextFrame2) {
container = container->GetParent();
}
NS_ASSERTION(container, "expected to find an ancestor nsSVGTextFrame2");
return
static_cast<const nsSVGTextFrame2*>(container)->GetFontSizeScaleFactor();
}
if (!FontSizeInflationEnabled(aFrame->PresContext())) {
return 1.0f;
}
return FontSizeInflationInner(aFrame, InflationMinFontSizeFor(aFrame));
}
/* static */ bool
nsLayoutUtils::FontSizeInflationEnabled(nsPresContext *aPresContext)
{
nsIPresShell* presShell = aPresContext->GetPresShell();
if (!presShell) {
return false;
}
return presShell->FontSizeInflationEnabled();
}
/* static */ nsRect
nsLayoutUtils::GetBoxShadowRectForFrame(nsIFrame* aFrame,
const nsSize& aFrameSize)
{
nsCSSShadowArray* boxShadows = aFrame->StyleBorder()->mBoxShadow;
if (!boxShadows) {
return nsRect();
}
nsRect shadows;
int32_t A2D = aFrame->PresContext()->AppUnitsPerDevPixel();
for (uint32_t i = 0; i < boxShadows->Length(); ++i) {
nsRect tmpRect(nsPoint(0, 0), aFrameSize);
nsCSSShadowItem* shadow = boxShadows->ShadowAt(i);
// inset shadows are never painted outside the frame
if (shadow->mInset)
continue;
tmpRect.MoveBy(nsPoint(shadow->mXOffset, shadow->mYOffset));
tmpRect.Inflate(shadow->mSpread);
tmpRect.Inflate(
nsContextBoxBlur::GetBlurRadiusMargin(shadow->mRadius, A2D));
shadows.UnionRect(shadows, tmpRect);
}
return shadows;
}
