2 * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
3 * Copyright (C) Research In Motion Limited 2011. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
14 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, 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 COMPUTER, 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.
28 #include "ImageBuffer.h"
31 #include <wtf/MathExtras.h>
36 void ImageBuffer::transformColorSpace(ColorSpace srcColorSpace, ColorSpace dstColorSpace)
38 if (srcColorSpace == dstColorSpace)
41 // only sRGB <-> linearRGB are supported at the moment
42 if ((srcColorSpace != ColorSpaceLinearRGB && srcColorSpace != ColorSpaceDeviceRGB)
43 || (dstColorSpace != ColorSpaceLinearRGB && dstColorSpace != ColorSpaceDeviceRGB))
46 if (dstColorSpace == ColorSpaceLinearRGB) {
47 if (m_linearRgbLUT.isEmpty()) {
48 for (unsigned i = 0; i < 256; i++) {
49 float color = i / 255.0f;
50 color = (color <= 0.04045f ? color / 12.92f : pow((color + 0.055f) / 1.055f, 2.4f));
51 color = std::max(0.0f, color);
52 color = std::min(1.0f, color);
53 m_linearRgbLUT.append(static_cast<int>(color * 255));
56 platformTransformColorSpace(m_linearRgbLUT);
57 } else if (dstColorSpace == ColorSpaceDeviceRGB) {
58 if (m_deviceRgbLUT.isEmpty()) {
59 for (unsigned i = 0; i < 256; i++) {
60 float color = i / 255.0f;
61 color = (powf(color, 1.0f / 2.4f) * 1.055f) - 0.055f;
62 color = std::max(0.0f, color);
63 color = std::min(1.0f, color);
64 m_deviceRgbLUT.append(static_cast<int>(color * 255));
67 platformTransformColorSpace(m_deviceRgbLUT);
72 inline void ImageBuffer::genericConvertToLuminanceMask()
74 IntRect luminanceRect(IntPoint(), size());
75 RefPtr<ByteArray> srcPixelArray = getUnmultipliedImageData(luminanceRect);
77 unsigned pixelArrayLength = srcPixelArray->length();
78 for (unsigned pixelOffset = 0; pixelOffset < pixelArrayLength; pixelOffset += 4) {
79 unsigned char a = srcPixelArray->get(pixelOffset + 3);
82 unsigned char r = srcPixelArray->get(pixelOffset);
83 unsigned char g = srcPixelArray->get(pixelOffset + 1);
84 unsigned char b = srcPixelArray->get(pixelOffset + 2);
86 double luma = (r * 0.2125 + g * 0.7154 + b * 0.0721) * ((double)a / 255.0);
87 srcPixelArray->set(pixelOffset + 3, luma);
89 putUnmultipliedImageData(srcPixelArray.get(), luminanceRect.size(), luminanceRect, IntPoint());
92 void ImageBuffer::convertToLuminanceMask()
94 // Add platform specific functions with platformConvertToLuminanceMask here later.
95 genericConvertToLuminanceMask();
98 #if USE(ACCELERATED_COMPOSITING) && !USE(SKIA)
99 PlatformLayer* ImageBuffer::platformLayer() const