third_party/WebKit/Source/platform/graphics/ColorSpace.h

/*
 * Copyright (C) 2009 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
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef ColorSpace_h
#define ColorSpace_h

#include "platform/PlatformExport.h"
#include "platform/graphics/Color.h"
#include "third_party/skia/include/core/SkRefCnt.h"

class SkColorFilter;

namespace blink {

enum ColorSpace { ColorSpaceDeviceRGB, ColorSpaceSRGB, ColorSpaceLinearRGB };

namespace ColorSpaceUtilities {

// Get a pointer to a 8-bit lookup table that will convert color components
// in the |srcColorSpace| to the |dstColorSpace|.
// If the conversion cannot be performed, or is a no-op (identity transform),
// then 0 is returned.
// (Note that a round-trip - f(B,A)[f(A,B)[x]] - is not lossless in general.)
const uint8_t* getConversionLUT(ColorSpace dstColorSpace,
                                ColorSpace srcColorSpace = ColorSpaceDeviceRGB);

// Convert a Color assumed to be in the |srcColorSpace| into the
// |dstColorSpace|.
Color convertColor(const Color& srcColor,
                   ColorSpace dstColorSpace,
                   ColorSpace srcColorSpace = ColorSpaceDeviceRGB);

// Create a color filter that will convert from |srcColorSpace| into
// |dstColorSpace|.
sk_sp<SkColorFilter> createColorSpaceFilter(ColorSpace srcColorSpace,
                                            ColorSpace dstColorSpace);

}  // namespace ColorSpaceUtilities

}  // namespace blink

#endif  // ColorSpace_h