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/*
* Copyright (C) 2006 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) 2007 Holger Hans Peter Freyther <zecke@selfish.org>
* Copyright (C) 2008, 2009 Dirk Schulze <krit@webkit.org>
* Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
* Copyright (C) 2020 Apple Inc. All rights reserved.
*
* 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 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 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 "ImageBufferCairoBackend.h"
#include "BitmapImage.h"
#include "CairoOperations.h"
#include "Color.h"
#include "ColorTransferFunctions.h"
#include "GraphicsContext.h"
#include "GraphicsContextCairo.h"
#include <cairo.h>
#if USE(CAIRO)
namespace WebCore {
void ImageBufferCairoBackend::transformToColorSpace(const DestinationColorSpace& newColorSpace)
{
#if ENABLE(DESTINATION_COLOR_SPACE_LINEAR_SRGB)
if (m_parameters.colorSpace == newColorSpace)
return;
// only sRGB <-> linearRGB are supported at the moment
if ((m_parameters.colorSpace != DestinationColorSpace::LinearSRGB() && m_parameters.colorSpace != DestinationColorSpace::SRGB())
|| (newColorSpace != DestinationColorSpace::LinearSRGB() && newColorSpace != DestinationColorSpace::SRGB()))
return;
m_parameters.colorSpace = newColorSpace;
if (newColorSpace == DestinationColorSpace::LinearSRGB()) {
static const std::array<uint8_t, 256> linearRgbLUT = [] {
std::array<uint8_t, 256> array;
for (unsigned i = 0; i < 256; i++) {
float color = i / 255.0f;
color = SRGBTransferFunction<float, TransferFunctionMode::Clamped>::toLinear(color);
array[i] = static_cast<uint8_t>(round(color * 255));
}
return array;
}();
platformTransformColorSpace(linearRgbLUT);
} else {
static const std::array<uint8_t, 256> deviceRgbLUT= [] {
std::array<uint8_t, 256> array;
for (unsigned i = 0; i < 256; i++) {
float color = i / 255.0f;
color = SRGBTransferFunction<float, TransferFunctionMode::Clamped>::toGammaEncoded(color);
array[i] = static_cast<uint8_t>(round(color * 255));
}
return array;
}();
platformTransformColorSpace(deviceRgbLUT);
}
#else
ASSERT(newColorSpace == DestinationColorSpace::SRGB());
ASSERT(m_parameters.colorSpace == DestinationColorSpace::SRGB());
UNUSED_PARAM(newColorSpace);
#endif
}
} // namespace WebCore
#endif // USE(CAIRO)
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