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// Copyright (c) 2006-2008 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 SKIA_EXT_SKIA_UTILS_H_
#define SKIA_EXT_SKIA_UTILS_H_
#include "third_party/skia/include/core/SkColor.h"
#include "third_party/skia/include/core/SkShader.h"
namespace skia {
struct HSL {
double h;
double s;
double l;
};
// Creates a vertical gradient shader. The caller owns the shader.
// Example usage to avoid leaks:
// paint.setShader(gfx::CreateGradientShader(0, 10, red, blue))->safeUnref();
//
// (The old shader in the paint, if any, needs to be freed, and safeUnref will
// handle the NULL case.)
SkShader* CreateGradientShader(int start_point,
int end_point,
SkColor start_color,
SkColor end_color);
// Convert an SkColor to a HSL value.
void SkColorToHSL(SkColor c, HSL& hsl);
// Convert a HSL color to an SkColor.
SkColor HSLToSkColor(U8CPU alpha, HSL hsl);
// HSL-Shift an SkColor. The shift values are in the range of 0-1, with the
// option to specify -1 for 'no change'. The shift values are defined as:
// hsl_shift[0] (hue): The absolute hue value - 0 and 1 map
// to 0 and 360 on the hue color wheel (red).
// hsl_shift[1] (saturation): A saturation shift, with the
// following key values:
// 0 = remove all color.
// 0.5 = leave unchanged.
// 1 = fully saturate the image.
// hsl_shift[2] (lightness): A lightness shift, with the
// following key values:
// 0 = remove all lightness (make all pixels black).
// 0.5 = leave unchanged.
// 1 = full lightness (make all pixels white).
SkColor HSLShift(SkColor color, skia::HSL shift);
} // namespace skia
#endif // SKIA_EXT_SKIA_UTILS_H_
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