1/* 2 * Copyright (C) 2009 Dirk Schulze <krit@webkit.org> 3 * Copyright (C) Research In Motion Limited 2011. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR 18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27#include "config.h" 28#include "ImageBuffer.h" 29 30#include "GraphicsContext.h" 31#include "IntRect.h" 32#include <wtf/MathExtras.h> 33 34namespace WebCore { 35 36#if !USE(CG) 37void ImageBuffer::transformColorSpace(ColorSpace srcColorSpace, ColorSpace dstColorSpace) 38{ 39 DEPRECATED_DEFINE_STATIC_LOCAL(Vector<int>, deviceRgbLUT, ()); 40 DEPRECATED_DEFINE_STATIC_LOCAL(Vector<int>, linearRgbLUT, ()); 41 42 if (srcColorSpace == dstColorSpace) 43 return; 44 45 // only sRGB <-> linearRGB are supported at the moment 46 if ((srcColorSpace != ColorSpaceLinearRGB && srcColorSpace != ColorSpaceDeviceRGB) 47 || (dstColorSpace != ColorSpaceLinearRGB && dstColorSpace != ColorSpaceDeviceRGB)) 48 return; 49 50 if (dstColorSpace == ColorSpaceLinearRGB) { 51 if (linearRgbLUT.isEmpty()) { 52 for (unsigned i = 0; i < 256; i++) { 53 float color = i / 255.0f; 54 color = (color <= 0.04045f ? color / 12.92f : pow((color + 0.055f) / 1.055f, 2.4f)); 55 color = std::max(0.0f, color); 56 color = std::min(1.0f, color); 57 linearRgbLUT.append(static_cast<int>(round(color * 255))); 58 } 59 } 60 platformTransformColorSpace(linearRgbLUT); 61 } else if (dstColorSpace == ColorSpaceDeviceRGB) { 62 if (deviceRgbLUT.isEmpty()) { 63 for (unsigned i = 0; i < 256; i++) { 64 float color = i / 255.0f; 65 color = (powf(color, 1.0f / 2.4f) * 1.055f) - 0.055f; 66 color = std::max(0.0f, color); 67 color = std::min(1.0f, color); 68 deviceRgbLUT.append(static_cast<int>(round(color * 255))); 69 } 70 } 71 platformTransformColorSpace(deviceRgbLUT); 72 } 73} 74#endif // USE(CG) 75 76inline void ImageBuffer::genericConvertToLuminanceMask() 77{ 78 IntRect luminanceRect(IntPoint(), internalSize()); 79 RefPtr<Uint8ClampedArray> srcPixelArray = getUnmultipliedImageData(luminanceRect); 80 81 unsigned pixelArrayLength = srcPixelArray->length(); 82 for (unsigned pixelOffset = 0; pixelOffset < pixelArrayLength; pixelOffset += 4) { 83 unsigned char a = srcPixelArray->item(pixelOffset + 3); 84 if (!a) 85 continue; 86 unsigned char r = srcPixelArray->item(pixelOffset); 87 unsigned char g = srcPixelArray->item(pixelOffset + 1); 88 unsigned char b = srcPixelArray->item(pixelOffset + 2); 89 90 double luma = (r * 0.2125 + g * 0.7154 + b * 0.0721) * ((double)a / 255.0); 91 srcPixelArray->set(pixelOffset + 3, luma); 92 } 93 putByteArray(Unmultiplied, srcPixelArray.get(), luminanceRect.size(), luminanceRect, IntPoint()); 94} 95 96void ImageBuffer::convertToLuminanceMask() 97{ 98 // Add platform specific functions with platformConvertToLuminanceMask here later. 99 genericConvertToLuminanceMask(); 100} 101 102#if !USE(CAIRO) 103PlatformLayer* ImageBuffer::platformLayer() const 104{ 105 return 0; 106} 107#endif 108 109bool ImageBuffer::copyToPlatformTexture(GraphicsContext3D&, Platform3DObject, GC3Denum, bool, bool) 110{ 111 return false; 112} 113 114std::unique_ptr<ImageBuffer> ImageBuffer::createCompatibleBuffer(const FloatSize& size, float resolutionScale, ColorSpace colorSpace, const GraphicsContext* context, bool) 115{ 116 return create(size, resolutionScale, colorSpace, context->isAcceleratedContext() ? Accelerated : Unaccelerated); 117} 118 119} 120