/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- * ***** BEGIN LICENSE BLOCK ***** * Version: MPL 1.1/GPL 2.0/LGPL 2.1 * * The contents of this file are subject to the Mozilla Public License Version * 1.1 (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Original Code is Oracle Corporation code. * * The Initial Developer of the Original Code is Oracle Corporation. * Portions created by the Initial Developer are Copyright (C) 2005 * the Initial Developer. All Rights Reserved. * * Contributor(s): * Stuart Parmenter * * Alternatively, the contents of this file may be used under the terms of * either the GNU General Public License Version 2 or later (the "GPL"), or * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), * in which case the provisions of the GPL or the LGPL are applicable instead * of those above. If you wish to allow use of your version of this file only * under the terms of either the GPL or the LGPL, and not to allow others to * use your version of this file under the terms of the MPL, indicate your * decision by deleting the provisions above and replace them with the notice * and other provisions required by the GPL or the LGPL. If you do not delete * the provisions above, a recipient may use your version of this file under * the terms of any one of the MPL, the GPL or the LGPL. * * ***** END LICENSE BLOCK ***** */ #ifndef GFX_COLOR_H #define GFX_COLOR_H #include "gfxTypes.h" #include "prbit.h" // for PR_ROTATE_(LEFT,RIGHT)32 #include "prio.h" // for ntohl #define GFX_UINT32_FROM_BPTR(pbptr,i) (((PRUint32*)(pbptr))[i]) #if defined(IS_BIG_ENDIAN) #define GFX_NTOHL(x) (x) #define GFX_HAVE_CHEAP_NTOHL #elif defined(_WIN32) #if (_MSC_VER >= 1300) // also excludes MinGW #include #pragma intrinsic(_byteswap_ulong) #define GFX_NTOHL(x) _byteswap_ulong(x) #define GFX_HAVE_CHEAP_NTOHL #else // A reasonably fast generic little-endian implementation. #define GFX_NTOHL(x) \ ( (PR_ROTATE_RIGHT32((x),8) & 0xFF00FF00) | \ (PR_ROTATE_LEFT32((x),8) & 0x00FF00FF) ) #endif #else #define GFX_NTOHL(x) ntohl(x) #define GFX_HAVE_CHEAP_NTOHL #endif /** * GFX_0XFF_PPIXEL_FROM_BPTR(x) * * Avoid tortured construction of 32-bit ARGB pixel from 3 individual bytes * of memory plus constant 0xFF. RGB bytes are already contiguous! * Equivalent to: GFX_PACKED_PIXEL(0xff,r,g,b) * * Attempt to use fast byte-swapping instruction(s), e.g. bswap on x86, in * preference to a sequence of shift/or operations. */ #if defined(GFX_HAVE_CHEAP_NTOHL) #define GFX_0XFF_PPIXEL_FROM_UINT32(x) \ ( (GFX_NTOHL(x) >> 8) | (0xFF << 24) ) #else // A reasonably fast generic little-endian implementation. #define GFX_0XFF_PPIXEL_FROM_UINT32(x) \ ( (PR_ROTATE_LEFT32((x),16) | 0xFF00FF00) & ((x) | 0xFFFF00FF) ) #endif #define GFX_0XFF_PPIXEL_FROM_BPTR(x) \ ( GFX_0XFF_PPIXEL_FROM_UINT32(GFX_UINT32_FROM_BPTR((x),0)) ) /** * GFX_BLOCK_RGB_TO_FRGB(from,to) * sizeof(*from) == sizeof(char) * sizeof(*to) == sizeof(PRUint32) * * Copy 4 pixels at a time, reading blocks of 12 bytes (RGB x4) * and writing blocks of 16 bytes (FRGB x4) */ #define GFX_BLOCK_RGB_TO_FRGB(from,to) \ PR_BEGIN_MACRO \ PRUint32 m0 = GFX_UINT32_FROM_BPTR(from,0), \ m1 = GFX_UINT32_FROM_BPTR(from,1), \ m2 = GFX_UINT32_FROM_BPTR(from,2), \ rgbr = GFX_NTOHL(m0), \ gbrg = GFX_NTOHL(m1), \ brgb = GFX_NTOHL(m2), \ p0, p1, p2, p3; \ p0 = 0xFF000000 | ((rgbr) >> 8); \ p1 = 0xFF000000 | ((rgbr) << 16) | ((gbrg) >> 16); \ p2 = 0xFF000000 | ((gbrg) << 8) | ((brgb) >> 24); \ p3 = 0xFF000000 | (brgb); \ to[0] = p0; to[1] = p1; to[2] = p2; to[3] = p3; \ PR_END_MACRO /** * Fast approximate division by 255. It has the property that * for all 0 <= n <= 255*255, GFX_DIVIDE_BY_255(n) == n/255. * But it only uses two adds and two shifts instead of an * integer division (which is expensive on many processors). * * equivalent to ((v)/255) */ #define GFX_DIVIDE_BY_255(v) \ (((((unsigned)(v)) << 8) + ((unsigned)(v)) + 255) >> 16) /** * Fast premultiply macro * * equivalent to (((c)*(a))/255) */ #define GFX_PREMULTIPLY(c,a) GFX_DIVIDE_BY_255((c)*(a)) /** * Macro to pack the 4 8-bit channels (A,R,G,B) * into a 32-bit packed premultiplied pixel. * * The checks for 0 alpha or max alpha ensure that the * compiler selects the quicked calculation when alpha is constant. */ #define GFX_PACKED_PIXEL(a,r,g,b) \ ((a) == 0x00) ? 0x00000000 : \ ((a) == 0xFF) ? ((0xFF << 24) | ((r) << 16) | ((g) << 8) | (b)) \ : ((a) << 24) | \ (GFX_PREMULTIPLY(r,a) << 16) | \ (GFX_PREMULTIPLY(g,a) << 8) | \ (GFX_PREMULTIPLY(b,a)) /** * Macro to pack the 4 8-bit channels (A,R,G,B) * into a 32-bit packed NON-premultiplied pixel. */ #define GFX_PACKED_PIXEL_NO_PREMULTIPLY(a,r,g,b) \ (((a) << 24) | ((r) << 16) | ((g) << 8) | (b)) /** * A color value, storing red, green, blue and alpha components. * This class does not use premultiplied alpha. * * XXX should this use doubles (instead of gfxFloat), for consistency with * cairo? */ struct THEBES_API gfxRGBA { gfxFloat r, g, b, a; enum PackedColorType { PACKED_ABGR, PACKED_ABGR_PREMULTIPLIED, PACKED_ARGB, PACKED_ARGB_PREMULTIPLIED, PACKED_XRGB }; gfxRGBA() { } /** * Intialize this color using explicit red, green, blue and alpha * values. */ gfxRGBA(gfxFloat _r, gfxFloat _g, gfxFloat _b, gfxFloat _a=1.0) : r(_r), g(_g), b(_b), a(_a) {} /** * Initialize this color from a packed 32-bit color. * The color value is interpreted based on colorType; * all values use the native platform endianness. * * @see gfxRGBA::Packed */ gfxRGBA(PRUint32 c, PackedColorType colorType = PACKED_ABGR) { if (colorType == PACKED_ABGR || colorType == PACKED_ABGR_PREMULTIPLIED) { r = ((c >> 0) & 0xff) * (1.0 / 255.0); g = ((c >> 8) & 0xff) * (1.0 / 255.0); b = ((c >> 16) & 0xff) * (1.0 / 255.0); a = ((c >> 24) & 0xff) * (1.0 / 255.0); } else if (colorType == PACKED_ARGB || colorType == PACKED_XRGB || colorType == PACKED_ARGB_PREMULTIPLIED) { b = ((c >> 0) & 0xff) * (1.0 / 255.0); g = ((c >> 8) & 0xff) * (1.0 / 255.0); r = ((c >> 16) & 0xff) * (1.0 / 255.0); a = ((c >> 24) & 0xff) * (1.0 / 255.0); } if (colorType == PACKED_ABGR_PREMULTIPLIED || colorType == PACKED_ARGB_PREMULTIPLIED) { if (a > 0.0) { r /= a; g /= a; b /= a; } } else if (colorType == PACKED_XRGB) { a = 1.0; } } bool operator==(const gfxRGBA& other) const { return r == other.r && g == other.g && b == other.b && a == other.a; } bool operator!=(const gfxRGBA& other) const { return !(*this == other); } /** * Returns this color value as a packed 32-bit integer. This reconstructs * the int32 based on the given colorType, always in the native byte order. * * Note: gcc 4.2.3 on at least Ubuntu (x86) does something strange with * (PRUint8)(c * 255.0) << x, where the result is different than * double d = c * 255.0; v = ((PRUint8) d) << x. */ PRUint32 Packed(PackedColorType colorType = PACKED_ABGR) const { gfxFloat rb = (r * 255.0); gfxFloat gb = (g * 255.0); gfxFloat bb = (b * 255.0); gfxFloat ab = (a * 255.0); if (colorType == PACKED_ABGR) { return (PRUint8(ab) << 24) | (PRUint8(bb) << 16) | (PRUint8(gb) << 8) | (PRUint8(rb) << 0); } if (colorType == PACKED_ARGB || colorType == PACKED_XRGB) { return (PRUint8(ab) << 24) | (PRUint8(rb) << 16) | (PRUint8(gb) << 8) | (PRUint8(bb) << 0); } rb *= a; gb *= a; bb *= a; if (colorType == PACKED_ABGR_PREMULTIPLIED) { return (((PRUint8)(ab) << 24) | ((PRUint8)(bb) << 16) | ((PRUint8)(gb) << 8) | ((PRUint8)(rb) << 0)); } if (colorType == PACKED_ARGB_PREMULTIPLIED) { return (((PRUint8)(ab) << 24) | ((PRUint8)(rb) << 16) | ((PRUint8)(gb) << 8) | ((PRUint8)(bb) << 0)); } return 0; } }; #endif /* _GFX_COLOR_H */