OLD | NEW |
(Empty) | |
| 1 /* |
| 2 * Copyright (c) 2008, Google Inc. All rights reserved. |
| 3 * Copyright (C) 2009 Dirk Schulze <krit@webkit.org> |
| 4 * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved. |
| 5 * |
| 6 * Redistribution and use in source and binary forms, with or without |
| 7 * modification, are permitted provided that the following conditions are |
| 8 * met: |
| 9 * |
| 10 * * Redistributions of source code must retain the above copyright |
| 11 * notice, this list of conditions and the following disclaimer. |
| 12 * * Redistributions in binary form must reproduce the above |
| 13 * copyright notice, this list of conditions and the following disclaimer |
| 14 * in the documentation and/or other materials provided with the |
| 15 * distribution. |
| 16 * * Neither the name of Google Inc. nor the names of its |
| 17 * contributors may be used to endorse or promote products derived from |
| 18 * this software without specific prior written permission. |
| 19 * |
| 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 23 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 24 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 25 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 26 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 30 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 31 */ |
| 32 |
| 33 #include "config.h" |
| 34 #include "platform/graphics/ColorSpace.h" |
| 35 |
| 36 #include "wtf/MathExtras.h" |
| 37 |
| 38 namespace WebCore { |
| 39 |
| 40 namespace ColorSpaceUtilities { |
| 41 |
| 42 static const uint8_t* getLinearRgbLUT() |
| 43 { |
| 44 static uint8_t linearRgbLUT[256]; |
| 45 static bool initialized; |
| 46 if (!initialized) { |
| 47 for (unsigned i = 0; i < 256; i++) { |
| 48 float color = i / 255.0f; |
| 49 color = (color <= 0.04045f ? color / 12.92f : pow((color + 0.055f) /
1.055f, 2.4f)); |
| 50 color = std::max(0.0f, color); |
| 51 color = std::min(1.0f, color); |
| 52 linearRgbLUT[i] = static_cast<uint8_t>(round(color * 255)); |
| 53 } |
| 54 initialized = true; |
| 55 } |
| 56 return linearRgbLUT; |
| 57 } |
| 58 |
| 59 static const uint8_t* getDeviceRgbLUT() |
| 60 { |
| 61 static uint8_t deviceRgbLUT[256]; |
| 62 static bool initialized; |
| 63 if (!initialized) { |
| 64 for (unsigned i = 0; i < 256; i++) { |
| 65 float color = i / 255.0f; |
| 66 color = (powf(color, 1.0f / 2.4f) * 1.055f) - 0.055f; |
| 67 color = std::max(0.0f, color); |
| 68 color = std::min(1.0f, color); |
| 69 deviceRgbLUT[i] = static_cast<uint8_t>(round(color * 255)); |
| 70 } |
| 71 initialized = true; |
| 72 } |
| 73 return deviceRgbLUT; |
| 74 } |
| 75 |
| 76 const uint8_t* getConversionLUT(ColorSpace dstColorSpace, ColorSpace srcColorSpa
ce) |
| 77 { |
| 78 // Identity. |
| 79 if (srcColorSpace == dstColorSpace) |
| 80 return 0; |
| 81 |
| 82 // Only sRGB/DeviceRGB <-> linearRGB are supported at the moment. |
| 83 if ((srcColorSpace != ColorSpaceLinearRGB && srcColorSpace != ColorSpaceDevi
ceRGB) |
| 84 || (dstColorSpace != ColorSpaceLinearRGB && dstColorSpace != ColorSpaceD
eviceRGB)) |
| 85 return 0; |
| 86 |
| 87 if (dstColorSpace == ColorSpaceLinearRGB) |
| 88 return getLinearRgbLUT(); |
| 89 if (dstColorSpace == ColorSpaceDeviceRGB) |
| 90 return getDeviceRgbLUT(); |
| 91 |
| 92 ASSERT_NOT_REACHED(); |
| 93 return 0; |
| 94 } |
| 95 |
| 96 Color convertColor(const Color& srcColor, ColorSpace dstColorSpace, ColorSpace s
rcColorSpace) |
| 97 { |
| 98 const uint8_t* lookupTable = getConversionLUT(dstColorSpace, srcColorSpace); |
| 99 if (!lookupTable) |
| 100 return srcColor; |
| 101 |
| 102 return Color(lookupTable[srcColor.red()], lookupTable[srcColor.green()], loo
kupTable[srcColor.blue()], srcColor.alpha()); |
| 103 } |
| 104 |
| 105 } // namespace ColorSpaceUtilities |
| 106 |
| 107 } // namespace WebCore |
OLD | NEW |