15c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)/* 25c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * Copyright (C) 2003, 2004, 2005, 2006, 2008 Apple Inc. All rights reserved. 35c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * 45c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * Redistribution and use in source and binary forms, with or without 55c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * modification, are permitted provided that the following conditions 65c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * are met: 75c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * 1. Redistributions of source code must retain the above copyright 85c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * notice, this list of conditions and the following disclaimer. 95c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * 2. Redistributions in binary form must reproduce the above copyright 105c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * notice, this list of conditions and the following disclaimer in the 115c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * documentation and/or other materials provided with the distribution. 125c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * 135c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY 145c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 155c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 165c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 175c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 185c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 195c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 205c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 215c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 225c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 2302772c6a72f1ee0b226341a4f4439970c29fc861Ben Murdoch * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 245c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) */ 255c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 265c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#include "config.h" 27f79f16f17ddc4f842d7b7a38603e280e94be826aTorne (Richard Coles)#include "platform/graphics/Color.h" 285c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 29d6cdb82654e8f3343a693ca752d5c4cee0324e17Torne (Richard Coles)#include "platform/Decimal.h" 307757ec2eadfa2dd8ac2aeed0a4399e9b07ec38cbBen Murdoch#include "wtf/Assertions.h" 317757ec2eadfa2dd8ac2aeed0a4399e9b07ec38cbBen Murdoch#include "wtf/HexNumber.h" 327757ec2eadfa2dd8ac2aeed0a4399e9b07ec38cbBen Murdoch#include "wtf/MathExtras.h" 33d6cdb82654e8f3343a693ca752d5c4cee0324e17Torne (Richard Coles)#include "wtf/dtoa.h" 347757ec2eadfa2dd8ac2aeed0a4399e9b07ec38cbBen Murdoch#include "wtf/text/StringBuilder.h" 355c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 36c1847b1379d12d0e05df27436bf19a9b1bf12deaTorne (Richard Coles)namespace blink { 375c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 38197021e6b966cfb06891637935ef33fff06433d1Ben Murdoch#if !COMPILER(MSVC) 3976c265b59aa821ccbf8c75ab2bb0d036e97d2956Torne (Richard Coles)// FIXME: Use C++11 strong enums to avoid static data member with initializer definition problems. 405c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)const RGBA32 Color::black; 415c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)const RGBA32 Color::white; 425c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)const RGBA32 Color::darkGray; 435c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)const RGBA32 Color::gray; 445c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)const RGBA32 Color::lightGray; 455c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)const RGBA32 Color::transparent; 465c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#endif 475c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 485c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)static const RGBA32 lightenedBlack = 0xFF545454; 495c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)static const RGBA32 darkenedWhite = 0xFFABABAB; 505c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 515c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)RGBA32 makeRGB(int r, int g, int b) 525c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){ 537242dc3dbeb210b5e876a3c42d1ec1a667fc621aPrimiano Tucci return 0xFF000000 | std::max(0, std::min(r, 255)) << 16 | std::max(0, std::min(g, 255)) << 8 | std::max(0, std::min(b, 255)); 545c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 555c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 565c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)RGBA32 makeRGBA(int r, int g, int b, int a) 575c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){ 587242dc3dbeb210b5e876a3c42d1ec1a667fc621aPrimiano Tucci return std::max(0, std::min(a, 255)) << 24 | std::max(0, std::min(r, 255)) << 16 | std::max(0, std::min(g, 255)) << 8 | std::max(0, std::min(b, 255)); 595c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 605c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 615c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)static int colorFloatToRGBAByte(float f) 625c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){ 635c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) // We use lroundf and 255 instead of nextafterf(256, 0) to match CG's rounding 647242dc3dbeb210b5e876a3c42d1ec1a667fc621aPrimiano Tucci return std::max(0, std::min(static_cast<int>(lroundf(255.0f * f)), 255)); 655c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 665c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 675c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)RGBA32 makeRGBA32FromFloats(float r, float g, float b, float a) 685c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){ 695c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return colorFloatToRGBAByte(a) << 24 | colorFloatToRGBAByte(r) << 16 | colorFloatToRGBAByte(g) << 8 | colorFloatToRGBAByte(b); 705c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 715c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 725c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)RGBA32 colorWithOverrideAlpha(RGBA32 color, float overrideAlpha) 735c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){ 745c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) RGBA32 rgbOnly = color & 0x00FFFFFF; 755c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) RGBA32 rgba = rgbOnly | colorFloatToRGBAByte(overrideAlpha) << 24; 765c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return rgba; 775c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 785c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 795c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)static double calcHue(double temp1, double temp2, double hueVal) 805c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){ 815c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) if (hueVal < 0.0) 825c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) hueVal++; 835c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) else if (hueVal > 1.0) 845c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) hueVal--; 855c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) if (hueVal * 6.0 < 1.0) 865c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return temp1 + (temp2 - temp1) * hueVal * 6.0; 875c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) if (hueVal * 2.0 < 1.0) 885c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return temp2; 895c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) if (hueVal * 3.0 < 2.0) 905c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return temp1 + (temp2 - temp1) * (2.0 / 3.0 - hueVal) * 6.0; 915c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return temp1; 925c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 935c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 945c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)// Explanation of this algorithm can be found in the CSS3 Color Module 955c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)// specification at http://www.w3.org/TR/css3-color/#hsl-color with further 9602772c6a72f1ee0b226341a4f4439970c29fc861Ben Murdoch// explanation available at http://en.wikipedia.org/wiki/HSL_color_space 975c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 985c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)// all values are in the range of 0 to 1.0 995c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)RGBA32 makeRGBAFromHSLA(double hue, double saturation, double lightness, double alpha) 1005c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){ 1015c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) const double scaleFactor = nextafter(256.0, 0.0); 1025c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 1035c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) if (!saturation) { 1045c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) int greyValue = static_cast<int>(lightness * scaleFactor); 1055c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return makeRGBA(greyValue, greyValue, greyValue, static_cast<int>(alpha * scaleFactor)); 1065c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) } 1075c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 1085c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) double temp2 = lightness < 0.5 ? lightness * (1.0 + saturation) : lightness + saturation - lightness * saturation; 1095c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) double temp1 = 2.0 * lightness - temp2; 11002772c6a72f1ee0b226341a4f4439970c29fc861Ben Murdoch 11102772c6a72f1ee0b226341a4f4439970c29fc861Ben Murdoch return makeRGBA(static_cast<int>(calcHue(temp1, temp2, hue + 1.0 / 3.0) * scaleFactor), 1125c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) static_cast<int>(calcHue(temp1, temp2, hue) * scaleFactor), 1135c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) static_cast<int>(calcHue(temp1, temp2, hue - 1.0 / 3.0) * scaleFactor), 1145c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) static_cast<int>(alpha * scaleFactor)); 1155c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 1165c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 1175c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)RGBA32 makeRGBAFromCMYKA(float c, float m, float y, float k, float a) 1185c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){ 1195c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) double colors = 1 - k; 1205c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) int r = static_cast<int>(nextafter(256, 0) * (colors * (1 - c))); 1215c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) int g = static_cast<int>(nextafter(256, 0) * (colors * (1 - m))); 1225c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) int b = static_cast<int>(nextafter(256, 0) * (colors * (1 - y))); 1235c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return makeRGBA(r, g, b, static_cast<float>(nextafter(256, 0) * a)); 1245c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 1255c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 1265c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)// originally moved here from the CSS parser 1275c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)template <typename CharacterType> 1285c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)static inline bool parseHexColorInternal(const CharacterType* name, unsigned length, RGBA32& rgb) 1295c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){ 1305c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) if (length != 3 && length != 6) 1315c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return false; 1325c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) unsigned value = 0; 1335c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) for (unsigned i = 0; i < length; ++i) { 1345c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) if (!isASCIIHexDigit(name[i])) 1355c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return false; 1365c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) value <<= 4; 1375c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) value |= toASCIIHexValue(name[i]); 1385c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) } 1395c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) if (length == 6) { 1405c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) rgb = 0xFF000000 | value; 1415c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return true; 1425c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) } 1435c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) // #abc converts to #aabbcc 1445c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) rgb = 0xFF000000 1455c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) | (value & 0xF00) << 12 | (value & 0xF00) << 8 1465c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) | (value & 0xF0) << 8 | (value & 0xF0) << 4 1475c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) | (value & 0xF) << 4 | (value & 0xF); 1485c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return true; 1495c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 1505c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 1515c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)bool Color::parseHexColor(const LChar* name, unsigned length, RGBA32& rgb) 1525c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){ 1535c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return parseHexColorInternal(name, length, rgb); 1545c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 1555c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 1565c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)bool Color::parseHexColor(const UChar* name, unsigned length, RGBA32& rgb) 1575c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){ 1585c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return parseHexColorInternal(name, length, rgb); 1595c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 1605c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 1615c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)bool Color::parseHexColor(const String& name, RGBA32& rgb) 1625c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){ 1635c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) unsigned length = name.length(); 16402772c6a72f1ee0b226341a4f4439970c29fc861Ben Murdoch 1655c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) if (!length) 1665c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return false; 1675c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) if (name.is8Bit()) 1685c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return parseHexColor(name.characters8(), name.length(), rgb); 169591b958dee2cf159d33a0b931e6231072eaf38d5Ben Murdoch return parseHexColor(name.characters16(), name.length(), rgb); 1705c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 1715c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 1725c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)int differenceSquared(const Color& c1, const Color& c2) 1735c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){ 1745c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) int dR = c1.red() - c2.red(); 1755c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) int dG = c1.green() - c2.green(); 1765c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) int dB = c1.blue() - c2.blue(); 1775c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return dR * dR + dG * dG + dB * dB; 1785c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 1795c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 18009380295ba73501a205346becac22c6978e4671dTorne (Richard Coles)bool Color::setFromString(const String& name) 1818abfc5808a4e34d6e03867af8bc440dee641886fTorne (Richard Coles){ 18209380295ba73501a205346becac22c6978e4671dTorne (Richard Coles) if (name[0] != '#') 18309380295ba73501a205346becac22c6978e4671dTorne (Richard Coles) return setNamedColor(name); 18409380295ba73501a205346becac22c6978e4671dTorne (Richard Coles) if (name.is8Bit()) 18509380295ba73501a205346becac22c6978e4671dTorne (Richard Coles) return parseHexColor(name.characters8() + 1, name.length() - 1, m_color); 18609380295ba73501a205346becac22c6978e4671dTorne (Richard Coles) return parseHexColor(name.characters16() + 1, name.length() - 1, m_color); 1878abfc5808a4e34d6e03867af8bc440dee641886fTorne (Richard Coles)} 1888abfc5808a4e34d6e03867af8bc440dee641886fTorne (Richard Coles) 18909380295ba73501a205346becac22c6978e4671dTorne (Richard Coles)String Color::serializedAsCSSComponentValue() const 1908abfc5808a4e34d6e03867af8bc440dee641886fTorne (Richard Coles){ 19109380295ba73501a205346becac22c6978e4671dTorne (Richard Coles) StringBuilder result; 19209380295ba73501a205346becac22c6978e4671dTorne (Richard Coles) result.reserveCapacity(32); 19309380295ba73501a205346becac22c6978e4671dTorne (Richard Coles) bool colorHasAlpha = hasAlpha(); 19409380295ba73501a205346becac22c6978e4671dTorne (Richard Coles) if (colorHasAlpha) 1959e12abdf8c3a23d52091ea54ebb6a04d327f9300Torne (Richard Coles) result.appendLiteral("rgba("); 19609380295ba73501a205346becac22c6978e4671dTorne (Richard Coles) else 1979e12abdf8c3a23d52091ea54ebb6a04d327f9300Torne (Richard Coles) result.appendLiteral("rgb("); 19809380295ba73501a205346becac22c6978e4671dTorne (Richard Coles) 19909380295ba73501a205346becac22c6978e4671dTorne (Richard Coles) result.appendNumber(static_cast<unsigned char>(red())); 2009e12abdf8c3a23d52091ea54ebb6a04d327f9300Torne (Richard Coles) result.appendLiteral(", "); 20109380295ba73501a205346becac22c6978e4671dTorne (Richard Coles) 20209380295ba73501a205346becac22c6978e4671dTorne (Richard Coles) result.appendNumber(static_cast<unsigned char>(green())); 2039e12abdf8c3a23d52091ea54ebb6a04d327f9300Torne (Richard Coles) result.appendLiteral(", "); 20409380295ba73501a205346becac22c6978e4671dTorne (Richard Coles) 20509380295ba73501a205346becac22c6978e4671dTorne (Richard Coles) result.appendNumber(static_cast<unsigned char>(blue())); 20609380295ba73501a205346becac22c6978e4671dTorne (Richard Coles) if (colorHasAlpha) { 2079e12abdf8c3a23d52091ea54ebb6a04d327f9300Torne (Richard Coles) result.appendLiteral(", "); 20809380295ba73501a205346becac22c6978e4671dTorne (Richard Coles) 20909380295ba73501a205346becac22c6978e4671dTorne (Richard Coles) NumberToStringBuffer buffer; 21009380295ba73501a205346becac22c6978e4671dTorne (Richard Coles) const char* alphaString = numberToFixedPrecisionString(alpha() / 255.0f, 6, buffer, true); 21109380295ba73501a205346becac22c6978e4671dTorne (Richard Coles) result.append(alphaString, strlen(alphaString)); 2128abfc5808a4e34d6e03867af8bc440dee641886fTorne (Richard Coles) } 21309380295ba73501a205346becac22c6978e4671dTorne (Richard Coles) 21409380295ba73501a205346becac22c6978e4671dTorne (Richard Coles) result.append(')'); 21509380295ba73501a205346becac22c6978e4671dTorne (Richard Coles) return result.toString(); 2168abfc5808a4e34d6e03867af8bc440dee641886fTorne (Richard Coles)} 2178abfc5808a4e34d6e03867af8bc440dee641886fTorne (Richard Coles) 2185c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)String Color::serialized() const 2195c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){ 2205c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) if (!hasAlpha()) { 2215c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) StringBuilder builder; 2225c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) builder.reserveCapacity(7); 2235c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) builder.append('#'); 2245c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) appendByteAsHex(red(), builder, Lowercase); 2255c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) appendByteAsHex(green(), builder, Lowercase); 2265c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) appendByteAsHex(blue(), builder, Lowercase); 2275c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return builder.toString(); 2285c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) } 2295c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 23002772c6a72f1ee0b226341a4f4439970c29fc861Ben Murdoch StringBuilder result; 23102772c6a72f1ee0b226341a4f4439970c29fc861Ben Murdoch result.reserveCapacity(28); 2325c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 2339e12abdf8c3a23d52091ea54ebb6a04d327f9300Torne (Richard Coles) result.appendLiteral("rgba("); 23402772c6a72f1ee0b226341a4f4439970c29fc861Ben Murdoch result.appendNumber(red()); 2359e12abdf8c3a23d52091ea54ebb6a04d327f9300Torne (Richard Coles) result.appendLiteral(", "); 23602772c6a72f1ee0b226341a4f4439970c29fc861Ben Murdoch result.appendNumber(green()); 2379e12abdf8c3a23d52091ea54ebb6a04d327f9300Torne (Richard Coles) result.appendLiteral(", "); 23802772c6a72f1ee0b226341a4f4439970c29fc861Ben Murdoch result.appendNumber(blue()); 2399e12abdf8c3a23d52091ea54ebb6a04d327f9300Torne (Richard Coles) result.appendLiteral(", "); 2405c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 2415c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) if (!alpha()) 2425c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) result.append('0'); 2435c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) else { 244d6cdb82654e8f3343a693ca752d5c4cee0324e17Torne (Richard Coles) result.append(Decimal::fromDouble(alpha() / 255.0).toString()); 2455c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) } 2465c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 2475c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) result.append(')'); 24802772c6a72f1ee0b226341a4f4439970c29fc861Ben Murdoch return result.toString(); 2495c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 2505c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 2515c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)String Color::nameForRenderTreeAsText() const 2525c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){ 2535c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) if (alpha() < 0xFF) 2545c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return String::format("#%02X%02X%02X%02X", red(), green(), blue(), alpha()); 2555c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return String::format("#%02X%02X%02X", red(), green(), blue()); 2565c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 2575c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 2588abfc5808a4e34d6e03867af8bc440dee641886fTorne (Richard Coles)static inline const NamedColor* findNamedColor(const String& name) 2598abfc5808a4e34d6e03867af8bc440dee641886fTorne (Richard Coles){ 2608abfc5808a4e34d6e03867af8bc440dee641886fTorne (Richard Coles) char buffer[64]; // easily big enough for the longest color name 2618abfc5808a4e34d6e03867af8bc440dee641886fTorne (Richard Coles) unsigned length = name.length(); 2628abfc5808a4e34d6e03867af8bc440dee641886fTorne (Richard Coles) if (length > sizeof(buffer) - 1) 2638abfc5808a4e34d6e03867af8bc440dee641886fTorne (Richard Coles) return 0; 2648abfc5808a4e34d6e03867af8bc440dee641886fTorne (Richard Coles) for (unsigned i = 0; i < length; ++i) { 2658abfc5808a4e34d6e03867af8bc440dee641886fTorne (Richard Coles) UChar c = name[i]; 2668abfc5808a4e34d6e03867af8bc440dee641886fTorne (Richard Coles) if (!c || c > 0x7F) 2678abfc5808a4e34d6e03867af8bc440dee641886fTorne (Richard Coles) return 0; 2688abfc5808a4e34d6e03867af8bc440dee641886fTorne (Richard Coles) buffer[i] = toASCIILower(static_cast<char>(c)); 2698abfc5808a4e34d6e03867af8bc440dee641886fTorne (Richard Coles) } 2708abfc5808a4e34d6e03867af8bc440dee641886fTorne (Richard Coles) buffer[length] = '\0'; 2718abfc5808a4e34d6e03867af8bc440dee641886fTorne (Richard Coles) return findColor(buffer, length); 2728abfc5808a4e34d6e03867af8bc440dee641886fTorne (Richard Coles)} 2738abfc5808a4e34d6e03867af8bc440dee641886fTorne (Richard Coles) 27409380295ba73501a205346becac22c6978e4671dTorne (Richard Coles)bool Color::setNamedColor(const String& name) 2758abfc5808a4e34d6e03867af8bc440dee641886fTorne (Richard Coles){ 2768abfc5808a4e34d6e03867af8bc440dee641886fTorne (Richard Coles) const NamedColor* foundColor = findNamedColor(name); 2778abfc5808a4e34d6e03867af8bc440dee641886fTorne (Richard Coles) m_color = foundColor ? foundColor->ARGBValue : 0; 27809380295ba73501a205346becac22c6978e4671dTorne (Richard Coles) return foundColor; 2798abfc5808a4e34d6e03867af8bc440dee641886fTorne (Richard Coles)} 2808abfc5808a4e34d6e03867af8bc440dee641886fTorne (Richard Coles) 2815c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)Color Color::light() const 2825c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){ 2835c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) // Hardcode this common case for speed. 2845c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) if (m_color == black) 2855c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return lightenedBlack; 28602772c6a72f1ee0b226341a4f4439970c29fc861Ben Murdoch 2875c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) const float scaleFactor = nextafterf(256.0f, 0.0f); 2885c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 2895c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) float r, g, b, a; 2905c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) getRGBA(r, g, b, a); 2915c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 2927242dc3dbeb210b5e876a3c42d1ec1a667fc621aPrimiano Tucci float v = std::max(r, std::max(g, b)); 2935c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 2945c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) if (v == 0.0f) 2955c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) // Lightened black with alpha. 2965c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return Color(0x54, 0x54, 0x54, alpha()); 2975c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 2987242dc3dbeb210b5e876a3c42d1ec1a667fc621aPrimiano Tucci float multiplier = std::min(1.0f, v + 0.33f) / v; 2995c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 3005c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return Color(static_cast<int>(multiplier * r * scaleFactor), 3015c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) static_cast<int>(multiplier * g * scaleFactor), 3025c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) static_cast<int>(multiplier * b * scaleFactor), 3035c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) alpha()); 3045c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 3055c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 3065c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)Color Color::dark() const 3075c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){ 3085c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) // Hardcode this common case for speed. 3095c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) if (m_color == white) 3105c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return darkenedWhite; 31102772c6a72f1ee0b226341a4f4439970c29fc861Ben Murdoch 3125c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) const float scaleFactor = nextafterf(256.0f, 0.0f); 3135c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 3145c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) float r, g, b, a; 3155c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) getRGBA(r, g, b, a); 3165c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 3177242dc3dbeb210b5e876a3c42d1ec1a667fc621aPrimiano Tucci float v = std::max(r, std::max(g, b)); 3187242dc3dbeb210b5e876a3c42d1ec1a667fc621aPrimiano Tucci float multiplier = std::max(0.0f, (v - 0.33f) / v); 3195c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 3205c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return Color(static_cast<int>(multiplier * r * scaleFactor), 3215c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) static_cast<int>(multiplier * g * scaleFactor), 3225c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) static_cast<int>(multiplier * b * scaleFactor), 3235c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) alpha()); 3245c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 3255c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 32609380295ba73501a205346becac22c6978e4671dTorne (Richard Coles)Color Color::combineWithAlpha(float otherAlpha) const 32709380295ba73501a205346becac22c6978e4671dTorne (Richard Coles){ 32809380295ba73501a205346becac22c6978e4671dTorne (Richard Coles) return colorWithOverrideAlpha(rgb(), (alpha() / 255.f) * otherAlpha); 32909380295ba73501a205346becac22c6978e4671dTorne (Richard Coles)} 33009380295ba73501a205346becac22c6978e4671dTorne (Richard Coles) 3315c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)static int blendComponent(int c, int a) 3325c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){ 3335c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) // We use white. 3345c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) float alpha = a / 255.0f; 3355c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) int whiteBlend = 255 - a; 3365c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) c -= whiteBlend; 3375c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return static_cast<int>(c / alpha); 3385c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 3395c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 3405c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)const int cStartAlpha = 153; // 60% 3415c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)const int cEndAlpha = 204; // 80%; 3425c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)const int cAlphaIncrement = 17; // Increments in between. 3435c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 3445c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)Color Color::blend(const Color& source) const 3455c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){ 3465c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) if (!alpha() || !source.hasAlpha()) 3475c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return source; 3485c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 3495c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) if (!source.alpha()) 3505c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return *this; 3515c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 3525c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) int d = 255 * (alpha() + source.alpha()) - alpha() * source.alpha(); 3535c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) int a = d / 255; 3545c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) int r = (red() * alpha() * (255 - source.alpha()) + 255 * source.alpha() * source.red()) / d; 3555c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) int g = (green() * alpha() * (255 - source.alpha()) + 255 * source.alpha() * source.green()) / d; 3565c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) int b = (blue() * alpha() * (255 - source.alpha()) + 255 * source.alpha() * source.blue()) / d; 3575c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return Color(r, g, b, a); 3585c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 3595c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 3605c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)Color Color::blendWithWhite() const 3615c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){ 3625c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) // If the color contains alpha already, we leave it alone. 3635c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) if (hasAlpha()) 3645c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return *this; 3655c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 3665c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) Color newColor; 3675c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) for (int alpha = cStartAlpha; alpha <= cEndAlpha; alpha += cAlphaIncrement) { 3685c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) // We have a solid color. Convert to an equivalent color that looks the same when blended with white 3695c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) // at the current alpha. Try using less transparency if the numbers end up being negative. 3705c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) int r = blendComponent(red(), alpha); 3715c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) int g = blendComponent(green(), alpha); 3725c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) int b = blendComponent(blue(), alpha); 37302772c6a72f1ee0b226341a4f4439970c29fc861Ben Murdoch 3745c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) newColor = Color(r, g, b, alpha); 3755c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 3765c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) if (r >= 0 && g >= 0 && b >= 0) 3775c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) break; 3785c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) } 3795c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return newColor; 3805c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 3815c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 3825c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)void Color::getRGBA(float& r, float& g, float& b, float& a) const 3835c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){ 3845c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) r = red() / 255.0f; 3855c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) g = green() / 255.0f; 3865c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) b = blue() / 255.0f; 3875c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) a = alpha() / 255.0f; 3885c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 3895c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 3905c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)void Color::getRGBA(double& r, double& g, double& b, double& a) const 3915c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){ 3925c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) r = red() / 255.0; 3935c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) g = green() / 255.0; 3945c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) b = blue() / 255.0; 3955c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) a = alpha() / 255.0; 3965c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 3975c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 3985c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)void Color::getHSL(double& hue, double& saturation, double& lightness) const 3995c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){ 4005c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) // http://en.wikipedia.org/wiki/HSL_color_space. This is a direct copy of 4015c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) // the algorithm therein, although it's 360^o based and we end up wanting 4025c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) // [0...1) based. It's clearer if we stick to 360^o until the end. 4035c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) double r = static_cast<double>(red()) / 255.0; 4045c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) double g = static_cast<double>(green()) / 255.0; 4055c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) double b = static_cast<double>(blue()) / 255.0; 4065c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) double max = std::max(std::max(r, g), b); 4075c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) double min = std::min(std::min(r, g), b); 4085c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 4095c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) if (max == min) 4105c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) hue = 0.0; 4115c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) else if (max == r) 4125c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) hue = (60.0 * ((g - b) / (max - min))) + 360.0; 4135c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) else if (max == g) 4145c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) hue = (60.0 * ((b - r) / (max - min))) + 120.0; 4155c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) else 4165c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) hue = (60.0 * ((r - g) / (max - min))) + 240.0; 4175c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 4185c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) if (hue >= 360.0) 4195c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) hue -= 360.0; 4205c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 4215c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) // makeRGBAFromHSLA assumes that hue is in [0...1). 4225c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) hue /= 360.0; 4235c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 4245c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) lightness = 0.5 * (max + min); 4255c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) if (max == min) 4265c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) saturation = 0.0; 4275c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) else if (lightness <= 0.5) 4285c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) saturation = ((max - min) / (max + min)); 4295c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) else 4305c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) saturation = ((max - min) / (2.0 - (max + min))); 4315c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 4325c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 433926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles)Color colorFromPremultipliedARGB(RGBA32 pixelColor) 4345c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){ 435926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) int alpha = alphaChannel(pixelColor); 436926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) if (alpha && alpha < 255) { 437926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) return Color::createUnchecked( 438926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) redChannel(pixelColor) * 255 / alpha, 439926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) greenChannel(pixelColor) * 255 / alpha, 440926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) blueChannel(pixelColor) * 255 / alpha, 441926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) alpha); 4425c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) } else 443926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) return Color(pixelColor); 4445c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 4455c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 446926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles)RGBA32 premultipliedARGBFromColor(const Color& color) 4475c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){ 4485c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) unsigned pixelColor; 4495c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 450926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) unsigned alpha = color.alpha(); 451926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) if (alpha < 255) { 452926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) pixelColor = Color::createUnchecked( 453926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) (color.red() * alpha + 254) / 255, 454926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) (color.green() * alpha + 254) / 255, 455926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) (color.blue() * alpha + 254) / 255, 456926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) alpha).rgb(); 4575c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) } else 4585c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) pixelColor = color.rgb(); 4595c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 4605c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return pixelColor; 4615c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 4625c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 463c1847b1379d12d0e05df27436bf19a9b1bf12deaTorne (Richard Coles)} // namespace blink 464