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/*
* Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "ImageBuffer.h"
#if !USE(CG)
#include <math.h>
namespace WebCore {
void ImageBuffer::transformColorSpace(ColorSpace srcColorSpace, ColorSpace dstColorSpace)
{
if (srcColorSpace == dstColorSpace)
return;
// only sRGB <-> linearRGB are supported at the moment
if ((srcColorSpace != ColorSpaceLinearRGB && srcColorSpace != ColorSpaceDeviceRGB)
|| (dstColorSpace != ColorSpaceLinearRGB && dstColorSpace != ColorSpaceDeviceRGB))
return;
if (dstColorSpace == ColorSpaceLinearRGB) {
if (m_linearRgbLUT.isEmpty()) {
for (unsigned i = 0; i < 256; i++) {
float color = i / 255.0f;
color = (color <= 0.04045f ? color / 12.92f : pow((color + 0.055f) / 1.055f, 2.4f));
color = std::max(0.0f, color);
color = std::min(1.0f, color);
m_linearRgbLUT.append(static_cast<int>(color * 255));
}
}
platformTransformColorSpace(m_linearRgbLUT);
} else if (dstColorSpace == ColorSpaceDeviceRGB) {
if (m_deviceRgbLUT.isEmpty()) {
for (unsigned i = 0; i < 256; i++) {
float color = i / 255.0f;
color = (powf(color, 1.0f / 2.4f) * 1.055f) - 0.055f;
color = std::max(0.0f, color);
color = std::min(1.0f, color);
m_deviceRgbLUT.append(static_cast<int>(color * 255));
}
}
platformTransformColorSpace(m_deviceRgbLUT);
}
}
}
#endif // USE(CG)
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