nsSVGPatternFrame.cpp
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */
// Main header first:
#include "nsSVGPatternFrame.h"
// Keep others in (case-insensitive) order:
#include "gfx2DGlue.h"
#include "gfxContext.h"
#include "gfxMatrix.h"
#include "gfxPattern.h"
#include "gfxPlatform.h"
#include "mozilla/gfx/2D.h"
#include "nsContentUtils.h"
#include "nsGkAtoms.h"
#include "nsISVGChildFrame.h"
#include "nsStyleContext.h"
#include "nsSVGEffects.h"
#include "nsSVGPathGeometryFrame.h"
#include "mozilla/dom/SVGPatternElement.h"
#include "nsSVGUtils.h"
#include "nsSVGAnimatedTransformList.h"
#include "SVGContentUtils.h"
using namespace mozilla;
using namespace mozilla::dom;
using namespace mozilla::gfx;
//----------------------------------------------------------------------
// Helper classes
class MOZ_RAII nsSVGPatternFrame::AutoPatternReferencer
{
public:
explicit AutoPatternReferencer(nsSVGPatternFrame *aFrame
MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
: mFrame(aFrame)
{
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
// Reference loops should normally be detected in advance and handled, so
// we're not expecting to encounter them here
MOZ_ASSERT(!mFrame->mLoopFlag, "Undetected reference loop!");
mFrame->mLoopFlag = true;
}
~AutoPatternReferencer() {
mFrame->mLoopFlag = false;
}
private:
nsSVGPatternFrame *mFrame;
MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};
//----------------------------------------------------------------------
// Implementation
nsSVGPatternFrame::nsSVGPatternFrame(nsStyleContext* aContext) :
nsSVGPatternFrameBase(aContext),
mLoopFlag(false),
mNoHRefURI(false)
{
}
NS_IMPL_FRAMEARENA_HELPERS(nsSVGPatternFrame)
//----------------------------------------------------------------------
// nsIFrame methods:
nsresult
nsSVGPatternFrame::AttributeChanged(int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType)
{
if (aNameSpaceID == kNameSpaceID_None &&
(aAttribute == nsGkAtoms::patternUnits ||
aAttribute == nsGkAtoms::patternContentUnits ||
aAttribute == nsGkAtoms::patternTransform ||
aAttribute == nsGkAtoms::x ||
aAttribute == nsGkAtoms::y ||
aAttribute == nsGkAtoms::width ||
aAttribute == nsGkAtoms::height ||
aAttribute == nsGkAtoms::preserveAspectRatio ||
aAttribute == nsGkAtoms::viewBox)) {
nsSVGEffects::InvalidateDirectRenderingObservers(this);
}
if (aNameSpaceID == kNameSpaceID_XLink &&
aAttribute == nsGkAtoms::href) {
// Blow away our reference, if any
Properties().Delete(nsSVGEffects::HrefProperty());
mNoHRefURI = false;
// And update whoever references us
nsSVGEffects::InvalidateDirectRenderingObservers(this);
}
return nsSVGPatternFrameBase::AttributeChanged(aNameSpaceID,
aAttribute, aModType);
}
#ifdef DEBUG
void
nsSVGPatternFrame::Init(nsIContent* aContent,
nsContainerFrame* aParent,
nsIFrame* aPrevInFlow)
{
NS_ASSERTION(aContent->IsSVGElement(nsGkAtoms::pattern), "Content is not an SVG pattern");
nsSVGPatternFrameBase::Init(aContent, aParent, aPrevInFlow);
}
#endif /* DEBUG */
nsIAtom*
nsSVGPatternFrame::GetType() const
{
return nsGkAtoms::svgPatternFrame;
}
//----------------------------------------------------------------------
// nsSVGContainerFrame methods:
// If our GetCanvasTM is getting called, we
// need to return *our current* transformation
// matrix, which depends on our units parameters
// and X, Y, Width, and Height
gfxMatrix
nsSVGPatternFrame::GetCanvasTM()
{
if (mCTM) {
return *mCTM;
}
// Do we know our rendering parent?
if (mSource) {
// Yes, use it!
return mSource->GetCanvasTM();
}
// We get here when geometry in the <pattern> container is updated
return gfxMatrix();
}
// -------------------------------------------------------------------------
// Helper functions
// -------------------------------------------------------------------------
/** Calculate the maximum expansion of a matrix */
static float
MaxExpansion(const Matrix &aMatrix)
{
// maximum expansion derivation from
// http://lists.cairographics.org/archives/cairo/2004-October/001980.html
// and also implemented in cairo_matrix_transformed_circle_major_axis
double a = aMatrix._11;
double b = aMatrix._12;
double c = aMatrix._21;
double d = aMatrix._22;
double f = (a * a + b * b + c * c + d * d) / 2;
double g = (a * a + b * b - c * c - d * d) / 2;
double h = a * c + b * d;
return sqrt(f + sqrt(g * g + h * h));
}
// The SVG specification says that the 'patternContentUnits' attribute "has no effect if
// attribute ‘viewBox’ is specified". We still need to include a bbox scale
// if the viewBox is specified and _patternUnits_ is set to or defaults to
// objectBoundingBox though, since in that case the viewBox is relative to the bbox
static bool
IncludeBBoxScale(const nsSVGViewBox& aViewBox,
uint32_t aPatternContentUnits, uint32_t aPatternUnits)
{
return (!aViewBox.IsExplicitlySet() &&
aPatternContentUnits == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) ||
(aViewBox.IsExplicitlySet() &&
aPatternUnits == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX);
}
// Given the matrix for the pattern element's own transform, this returns a
// combined matrix including the transforms applicable to its target.
static Matrix
GetPatternMatrix(uint16_t aPatternUnits,
const Matrix &patternTransform,
const gfxRect &bbox,
const gfxRect &callerBBox,
const Matrix &callerCTM)
{
// We really want the pattern matrix to handle translations
gfxFloat minx = bbox.X();
gfxFloat miny = bbox.Y();
if (aPatternUnits == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
minx += callerBBox.X();
miny += callerBBox.Y();
}
float scale = 1.0f / MaxExpansion(callerCTM);
Matrix patternMatrix = patternTransform;
patternMatrix.PreScale(scale, scale);
patternMatrix.PreTranslate(minx, miny);
return patternMatrix;
}
static nsresult
GetTargetGeometry(gfxRect *aBBox,
const nsSVGViewBox &aViewBox,
uint16_t aPatternContentUnits,
uint16_t aPatternUnits,
nsIFrame *aTarget,
const Matrix &aContextMatrix,
const gfxRect *aOverrideBounds)
{
*aBBox = aOverrideBounds ? *aOverrideBounds : nsSVGUtils::GetBBox(aTarget);
// Sanity check
if (IncludeBBoxScale(aViewBox, aPatternContentUnits, aPatternUnits) &&
(aBBox->Width() <= 0 || aBBox->Height() <= 0)) {
return NS_ERROR_FAILURE;
}
// OK, now fix up the bounding box to reflect user coordinates
// We handle device unit scaling in pattern matrix
float scale = MaxExpansion(aContextMatrix);
if (scale <= 0) {
return NS_ERROR_FAILURE;
}
aBBox->Scale(scale);
return NS_OK;
}
already_AddRefed<SourceSurface>
nsSVGPatternFrame::PaintPattern(const DrawTarget* aDrawTarget,
Matrix* patternMatrix,
const Matrix &aContextMatrix,
nsIFrame *aSource,
nsStyleSVGPaint nsStyleSVG::*aFillOrStroke,
float aGraphicOpacity,
const gfxRect *aOverrideBounds)
{
/*
* General approach:
* Set the content geometry stuff
* Calculate our bbox (using x,y,width,height & patternUnits &
* patternTransform)
* Create the surface
* Calculate the content transformation matrix
* Get our children (we may need to get them from another Pattern)
* Call SVGPaint on all of our children
* Return
*/
nsSVGPatternFrame* patternWithChildren = GetPatternWithChildren();
if (!patternWithChildren) {
return nullptr; // Either no kids or a bad reference
}
nsIFrame* firstKid = patternWithChildren->mFrames.FirstChild();
const nsSVGViewBox& viewBox = GetViewBox();
uint16_t patternContentUnits =
GetEnumValue(SVGPatternElement::PATTERNCONTENTUNITS);
uint16_t patternUnits =
GetEnumValue(SVGPatternElement::PATTERNUNITS);
/*
* Get the content geometry information. This is a little tricky --
* our parent is probably a <defs>, but we are rendering in the context
* of some geometry source. Our content geometry information needs to
* come from our rendering parent as opposed to our content parent. We
* get that information from aSource, which is passed to us from the
* backend renderer.
*
* There are three "geometries" that we need:
* 1) The bounding box for the pattern. We use this to get the
* width and height for the surface, and as the return to
* GetBBox.
* 2) The transformation matrix for the pattern. This is not *quite*
* the same as the canvas transformation matrix that we will
* provide to our rendering children since we "fudge" it a little
* to get the renderer to handle the translations correctly for us.
* 3) The CTM that we return to our children who make up the pattern.
*/
// Get all of the information we need from our "caller" -- i.e.
// the geometry that is being rendered with a pattern
gfxRect callerBBox;
if (NS_FAILED(GetTargetGeometry(&callerBBox,
viewBox,
patternContentUnits, patternUnits,
aSource,
aContextMatrix,
aOverrideBounds))) {
return nullptr;
}
// Construct the CTM that we will provide to our children when we
// render them into the tile.
gfxMatrix ctm = ConstructCTM(viewBox, patternContentUnits, patternUnits,
callerBBox, aContextMatrix, aSource);
if (ctm.IsSingular()) {
return nullptr;
}
if (patternWithChildren->mCTM) {
*patternWithChildren->mCTM = ctm;
} else {
patternWithChildren->mCTM = new gfxMatrix(ctm);
}
// Get the bounding box of the pattern. This will be used to determine
// the size of the surface, and will also be used to define the bounding
// box for the pattern tile.
gfxRect bbox = GetPatternRect(patternUnits, callerBBox, aContextMatrix, aSource);
if (bbox.Width() <= 0.0 || bbox.Height() <= 0.0) {
return nullptr;
}
// Get the pattern transform
Matrix patternTransform = ToMatrix(GetPatternTransform());
// revert the vector effect transform so that the pattern appears unchanged
if (aFillOrStroke == &nsStyleSVG::mStroke) {
gfxMatrix userToOuterSVG;
if (nsSVGUtils::GetNonScalingStrokeTransform(aSource, &userToOuterSVG)) {
patternTransform *= ToMatrix(userToOuterSVG);
if (patternTransform.IsSingular()) {
NS_WARNING("Singular matrix painting non-scaling-stroke");
return nullptr;
}
}
}
// Get the transformation matrix that we will hand to the renderer's pattern
// routine.
*patternMatrix = GetPatternMatrix(patternUnits, patternTransform,
bbox, callerBBox, aContextMatrix);
if (patternMatrix->IsSingular()) {
return nullptr;
}
// Now that we have all of the necessary geometries, we can
// create our surface.
gfxRect transformedBBox = ThebesRect(patternTransform.TransformBounds(ToRect(bbox)));
bool resultOverflows;
IntSize surfaceSize =
nsSVGUtils::ConvertToSurfaceSize(
transformedBBox.Size(), &resultOverflows);
// 0 disables rendering, < 0 is an error
if (surfaceSize.width <= 0 || surfaceSize.height <= 0) {
return nullptr;
}
gfxFloat patternWidth = bbox.Width();
gfxFloat patternHeight = bbox.Height();
if (resultOverflows ||
patternWidth != surfaceSize.width ||
patternHeight != surfaceSize.height) {
// scale drawing to pattern surface size
gfxMatrix tempTM =
gfxMatrix(surfaceSize.width / patternWidth, 0.0,
0.0, surfaceSize.height / patternHeight,
0.0, 0.0);
patternWithChildren->mCTM->PreMultiply(tempTM);
// and rescale pattern to compensate
patternMatrix->PreScale(patternWidth / surfaceSize.width,
patternHeight / surfaceSize.height);
}
RefPtr<DrawTarget> dt =
aDrawTarget->CreateSimilarDrawTarget(surfaceSize, SurfaceFormat::B8G8R8A8);
if (!dt) {
return nullptr;
}
dt->ClearRect(Rect(0, 0, surfaceSize.width, surfaceSize.height));
RefPtr<gfxContext> gfx = new gfxContext(dt);
if (aGraphicOpacity != 1.0f) {
gfx->Save();
gfx->PushGroupForBlendBack(gfxContentType::COLOR_ALPHA, aGraphicOpacity);
}
// OK, now render -- note that we use "firstKid", which
// we got at the beginning because it takes care of the
// referenced pattern situation for us
if (aSource->IsFrameOfType(nsIFrame::eSVGGeometry)) {
// Set the geometrical parent of the pattern we are rendering
patternWithChildren->mSource = static_cast<nsSVGPathGeometryFrame*>(aSource);
}
// Delay checking NS_FRAME_DRAWING_AS_PAINTSERVER bit until here so we can
// give back a clear surface if there's a loop
if (!(patternWithChildren->GetStateBits() & NS_FRAME_DRAWING_AS_PAINTSERVER)) {
patternWithChildren->AddStateBits(NS_FRAME_DRAWING_AS_PAINTSERVER);
for (nsIFrame* kid = firstKid; kid;
kid = kid->GetNextSibling()) {
// The CTM of each frame referencing us can be different
nsISVGChildFrame* SVGFrame = do_QueryFrame(kid);
if (SVGFrame) {
SVGFrame->NotifySVGChanged(nsISVGChildFrame::TRANSFORM_CHANGED);
}
gfxMatrix tm = *(patternWithChildren->mCTM);
if (kid->GetContent()->IsSVGElement()) {
tm = static_cast<nsSVGElement*>(kid->GetContent())->
PrependLocalTransformsTo(tm, eUserSpaceToParent);
}
nsSVGUtils::PaintFrameWithEffects(kid, *gfx, tm);
}
patternWithChildren->RemoveStateBits(NS_FRAME_DRAWING_AS_PAINTSERVER);
}
patternWithChildren->mSource = nullptr;
if (aGraphicOpacity != 1.0f) {
gfx->PopGroupAndBlend();
gfx->Restore();
}
// caller now owns the surface
return dt->Snapshot();
}
/* Will probably need something like this... */
// How do we handle the insertion of a new frame?
// We really don't want to rerender this every time,
// do we?
nsSVGPatternFrame*
nsSVGPatternFrame::GetPatternWithChildren()
{
// Do we have any children ourselves?
if (!mFrames.IsEmpty())
return this;
// No, see if we chain to someone who does
AutoPatternReferencer patternRef(this);
nsSVGPatternFrame* next = GetReferencedPatternIfNotInUse();
if (!next)
return nullptr;
return next->GetPatternWithChildren();
}
uint16_t
nsSVGPatternFrame::GetEnumValue(uint32_t aIndex, nsIContent *aDefault)
{
nsSVGEnum& thisEnum =
static_cast<SVGPatternElement *>(mContent)->mEnumAttributes[aIndex];
if (thisEnum.IsExplicitlySet())
return thisEnum.GetAnimValue();
AutoPatternReferencer patternRef(this);
nsSVGPatternFrame *next = GetReferencedPatternIfNotInUse();
return next ? next->GetEnumValue(aIndex, aDefault) :
static_cast<SVGPatternElement *>(aDefault)->
mEnumAttributes[aIndex].GetAnimValue();
}
nsSVGAnimatedTransformList*
nsSVGPatternFrame::GetPatternTransformList(nsIContent* aDefault)
{
nsSVGAnimatedTransformList *thisTransformList =
static_cast<SVGPatternElement *>(mContent)->GetAnimatedTransformList();
if (thisTransformList && thisTransformList->IsExplicitlySet())
return thisTransformList;
AutoPatternReferencer patternRef(this);
nsSVGPatternFrame *next = GetReferencedPatternIfNotInUse();
return next ? next->GetPatternTransformList(aDefault) :
static_cast<SVGPatternElement *>(aDefault)->mPatternTransform.get();
}
gfxMatrix
nsSVGPatternFrame::GetPatternTransform()
{
nsSVGAnimatedTransformList* animTransformList =
GetPatternTransformList(mContent);
if (!animTransformList)
return gfxMatrix();
return animTransformList->GetAnimValue().GetConsolidationMatrix();
}
const nsSVGViewBox &
nsSVGPatternFrame::GetViewBox(nsIContent* aDefault)
{
const nsSVGViewBox &thisViewBox =
static_cast<SVGPatternElement *>(mContent)->mViewBox;
if (thisViewBox.IsExplicitlySet())
return thisViewBox;
AutoPatternReferencer patternRef(this);
nsSVGPatternFrame *next = GetReferencedPatternIfNotInUse();
return next ? next->GetViewBox(aDefault) :
static_cast<SVGPatternElement *>(aDefault)->mViewBox;
}
const SVGAnimatedPreserveAspectRatio &
nsSVGPatternFrame::GetPreserveAspectRatio(nsIContent *aDefault)
{
const SVGAnimatedPreserveAspectRatio &thisPar =
static_cast<SVGPatternElement *>(mContent)->mPreserveAspectRatio;
if (thisPar.IsExplicitlySet())
return thisPar;
AutoPatternReferencer patternRef(this);
nsSVGPatternFrame *next = GetReferencedPatternIfNotInUse();
return next ? next->GetPreserveAspectRatio(aDefault) :
static_cast<SVGPatternElement *>(aDefault)->mPreserveAspectRatio;
}
const nsSVGLength2 *
nsSVGPatternFrame::GetLengthValue(uint32_t aIndex, nsIContent *aDefault)
{
const nsSVGLength2 *thisLength =
&static_cast<SVGPatternElement *>(mContent)->mLengthAttributes[aIndex];
if (thisLength->IsExplicitlySet())
return thisLength;
AutoPatternReferencer patternRef(this);
nsSVGPatternFrame *next = GetReferencedPatternIfNotInUse();
return next ? next->GetLengthValue(aIndex, aDefault) :
&static_cast<SVGPatternElement *>(aDefault)->mLengthAttributes[aIndex];
}
// Private (helper) methods
nsSVGPatternFrame *
nsSVGPatternFrame::GetReferencedPattern()
{
if (mNoHRefURI)
return nullptr;
nsSVGPaintingProperty *property = static_cast<nsSVGPaintingProperty*>
(Properties().Get(nsSVGEffects::HrefProperty()));
if (!property) {
// Fetch our pattern element's xlink:href attribute
SVGPatternElement *pattern = static_cast<SVGPatternElement *>(mContent);
nsAutoString href;
pattern->mStringAttributes[SVGPatternElement::HREF].GetAnimValue(href, pattern);
if (href.IsEmpty()) {
mNoHRefURI = true;
return nullptr; // no URL
}
// Convert href to an nsIURI
nsCOMPtr<nsIURI> targetURI;
nsCOMPtr<nsIURI> base = mContent->GetBaseURI();
nsContentUtils::NewURIWithDocumentCharset(getter_AddRefs(targetURI), href,
mContent->GetCurrentDoc(), base);
property =
nsSVGEffects::GetPaintingProperty(targetURI, this, nsSVGEffects::HrefProperty());
if (!property)
return nullptr;
}
nsIFrame *result = property->GetReferencedFrame();
if (!result)
return nullptr;
nsIAtom* frameType = result->GetType();
if (frameType != nsGkAtoms::svgPatternFrame)
return nullptr;
return static_cast<nsSVGPatternFrame*>(result);
}
nsSVGPatternFrame *
nsSVGPatternFrame::GetReferencedPatternIfNotInUse()
{
nsSVGPatternFrame *referenced = GetReferencedPattern();
if (!referenced)
return nullptr;
if (referenced->mLoopFlag) {
// XXXjwatt: we should really send an error to the JavaScript Console here:
NS_WARNING("pattern reference loop detected while inheriting attribute!");
return nullptr;
}
return referenced;
}
gfxRect
nsSVGPatternFrame::GetPatternRect(uint16_t aPatternUnits,
const gfxRect &aTargetBBox,
const Matrix &aTargetCTM,
nsIFrame *aTarget)
{
// We need to initialize our box
float x,y,width,height;
// Get the pattern x,y,width, and height
const nsSVGLength2 *tmpX, *tmpY, *tmpHeight, *tmpWidth;
tmpX = GetLengthValue(SVGPatternElement::ATTR_X);
tmpY = GetLengthValue(SVGPatternElement::ATTR_Y);
tmpHeight = GetLengthValue(SVGPatternElement::ATTR_HEIGHT);
tmpWidth = GetLengthValue(SVGPatternElement::ATTR_WIDTH);
if (aPatternUnits == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
x = nsSVGUtils::ObjectSpace(aTargetBBox, tmpX);
y = nsSVGUtils::ObjectSpace(aTargetBBox, tmpY);
width = nsSVGUtils::ObjectSpace(aTargetBBox, tmpWidth);
height = nsSVGUtils::ObjectSpace(aTargetBBox, tmpHeight);
} else {
float scale = MaxExpansion(aTargetCTM);
x = nsSVGUtils::UserSpace(aTarget, tmpX) * scale;
y = nsSVGUtils::UserSpace(aTarget, tmpY) * scale;
width = nsSVGUtils::UserSpace(aTarget, tmpWidth) * scale;
height = nsSVGUtils::UserSpace(aTarget, tmpHeight) * scale;
}
return gfxRect(x, y, width, height);
}
gfxMatrix
nsSVGPatternFrame::ConstructCTM(const nsSVGViewBox& aViewBox,
uint16_t aPatternContentUnits,
uint16_t aPatternUnits,
const gfxRect &callerBBox,
const Matrix &callerCTM,
nsIFrame *aTarget)
{
SVGSVGElement *ctx = nullptr;
nsIContent* targetContent = aTarget->GetContent();
gfxFloat scaleX, scaleY;
// The objectBoundingBox conversion must be handled in the CTM:
if (IncludeBBoxScale(aViewBox, aPatternContentUnits, aPatternUnits)) {
scaleX = callerBBox.Width();
scaleY = callerBBox.Height();
} else {
if (targetContent->IsSVGElement()) {
ctx = static_cast<nsSVGElement*>(targetContent)->GetCtx();
}
scaleX = scaleY = MaxExpansion(callerCTM);
}
if (!aViewBox.IsExplicitlySet()) {
return gfxMatrix(scaleX, 0.0, 0.0, scaleY, 0.0, 0.0);
}
const nsSVGViewBoxRect viewBoxRect = aViewBox.GetAnimValue();
if (viewBoxRect.height <= 0.0f || viewBoxRect.width <= 0.0f) {
return gfxMatrix(0.0, 0.0, 0.0, 0.0, 0.0, 0.0); // singular
}
float viewportWidth, viewportHeight;
if (targetContent->IsSVGElement()) {
// If we're dealing with an SVG target only retrieve the context once.
// Calling the nsIFrame* variant of GetAnimValue would look it up on
// every call.
viewportWidth =
GetLengthValue(SVGPatternElement::ATTR_WIDTH)->GetAnimValue(ctx);
viewportHeight =
GetLengthValue(SVGPatternElement::ATTR_HEIGHT)->GetAnimValue(ctx);
} else {
// No SVG target, call the nsIFrame* variant of GetAnimValue.
viewportWidth =
GetLengthValue(SVGPatternElement::ATTR_WIDTH)->GetAnimValue(aTarget);
viewportHeight =
GetLengthValue(SVGPatternElement::ATTR_HEIGHT)->GetAnimValue(aTarget);
}
if (viewportWidth <= 0.0f || viewportHeight <= 0.0f) {
return gfxMatrix(0.0, 0.0, 0.0, 0.0, 0.0, 0.0); // singular
}
Matrix tm = SVGContentUtils::GetViewBoxTransform(
viewportWidth * scaleX, viewportHeight * scaleY,
viewBoxRect.x, viewBoxRect.y,
viewBoxRect.width, viewBoxRect.height,
GetPreserveAspectRatio());
return ThebesMatrix(tm);
}
//----------------------------------------------------------------------
// nsSVGPaintServerFrame methods:
already_AddRefed<gfxPattern>
nsSVGPatternFrame::GetPaintServerPattern(nsIFrame *aSource,
const DrawTarget* aDrawTarget,
const gfxMatrix& aContextMatrix,
nsStyleSVGPaint nsStyleSVG::*aFillOrStroke,
float aGraphicOpacity,
const gfxRect *aOverrideBounds)
{
if (aGraphicOpacity == 0.0f) {
RefPtr<gfxPattern> pattern = new gfxPattern(Color());
return pattern.forget();
}
// Paint it!
Matrix pMatrix;
RefPtr<SourceSurface> surface =
PaintPattern(aDrawTarget, &pMatrix, ToMatrix(aContextMatrix), aSource,
aFillOrStroke, aGraphicOpacity, aOverrideBounds);
if (!surface) {
return nullptr;
}
RefPtr<gfxPattern> pattern = new gfxPattern(surface, pMatrix);
if (!pattern || pattern->CairoStatus())
return nullptr;
pattern->SetExtend(ExtendMode::REPEAT);
return pattern.forget();
}
// -------------------------------------------------------------------------
// Public functions
// -------------------------------------------------------------------------
nsIFrame* NS_NewSVGPatternFrame(nsIPresShell* aPresShell,
nsStyleContext* aContext)
{
return new (aPresShell) nsSVGPatternFrame(aContext);
}
