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// Copyright (c) 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_GFX_COLOR_TRANSFORM_H_
#define UI_GFX_COLOR_TRANSFORM_H_
#include "base/macros.h"
#include "ui/gfx/color_space.h"
#include "ui/gfx/geometry/point3_f.h"
#include "ui/gfx/gfx_export.h"
namespace gfx {
class GFX_EXPORT ColorTransform {
public:
enum class Intent { INTENT_ABSOLUTE, INTENT_PERCEPTUAL, TEST_NO_OPT };
// TriStimulus is a color coordinate in any color space.
// Channel order is XYZ, RGB or YUV.
typedef Point3F TriStim;
ColorTransform();
virtual ~ColorTransform();
virtual gfx::ColorSpace GetSrcColorSpace() const = 0;
virtual gfx::ColorSpace GetDstColorSpace() const = 0;
// Perform transformation of colors, |colors| is both input and output.
virtual void Transform(TriStim* colors, size_t num) const = 0;
// Return GLSL shader source that defines a function DoColorConversion that
// converts a vec3 according to this transform.
virtual bool CanGetShaderSource() const = 0;
virtual std::string GetShaderSource() const = 0;
// Returns true if this transform is the identity.
virtual bool IsIdentity() const = 0;
virtual size_t NumberOfStepsForTesting() const = 0;
static std::unique_ptr<ColorTransform> NewColorTransform(
const ColorSpace& from,
const ColorSpace& to,
Intent intent);
private:
DISALLOW_COPY_AND_ASSIGN(ColorTransform);
};
} // namespace gfx
#endif // UI_GFX_COLOR_TRANSFORM_H_
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