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/*
* Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
* Copyright (C) 2007 Alp Toker <alp@atoker.com>
* Copyright (C) 2008 Torch Mobile, Inc.
* Copyright (C) 2013 Google 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 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.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_GRADIENT_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_GRADIENT_H_
#include "base/memory/scoped_refptr.h"
#include "cc/paint/paint_flags.h"
#include "third_party/blink/renderer/platform/graphics/color.h"
#include "third_party/blink/renderer/platform/graphics/paint/paint_shader.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/ref_counted.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
#include "third_party/skia/include/core/SkRefCnt.h"
#include "third_party/skia/include/effects/SkGradientShader.h"
class SkMatrix;
namespace gfx {
class PointF;
}
namespace blink {
struct ImageDrawOptions;
class DarkModeFilter;
class PLATFORM_EXPORT Gradient : public RefCounted<Gradient> {
USING_FAST_MALLOC(Gradient);
public:
enum class Type { kLinear, kRadial, kConic };
enum class PremultipliedAlpha {
kPremultiplied,
kUnpremultiplied,
};
enum class DegenerateHandling {
kAllow,
kDisallow,
};
enum class SpreadMethod {
kPad,
kReflect,
kRepeat,
};
static scoped_refptr<Gradient> CreateLinear(
const gfx::PointF& p0,
const gfx::PointF& p1,
SpreadMethod = SpreadMethod::kPad,
PremultipliedAlpha = PremultipliedAlpha::kUnpremultiplied,
DegenerateHandling = DegenerateHandling::kAllow);
static scoped_refptr<Gradient> CreateRadial(
const gfx::PointF& p0,
float r0,
const gfx::PointF& p1,
float r1,
float aspect_ratio = 1,
SpreadMethod = SpreadMethod::kPad,
PremultipliedAlpha = PremultipliedAlpha::kUnpremultiplied,
DegenerateHandling = DegenerateHandling::kAllow);
static scoped_refptr<Gradient> CreateConic(
const gfx::PointF& position,
float rotation,
float start_angle,
float end_angle,
SpreadMethod = SpreadMethod::kPad,
PremultipliedAlpha = PremultipliedAlpha::kUnpremultiplied,
DegenerateHandling = DegenerateHandling::kAllow);
Gradient(const Gradient&) = delete;
Gradient& operator=(const Gradient&) = delete;
virtual ~Gradient();
Type GetType() const { return type_; }
struct ColorStop {
DISALLOW_NEW();
double stop;
Color color;
ColorStop(double s, const Color& c) : stop(s), color(c) {}
};
void AddColorStop(const ColorStop&);
void AddColorStop(double value, const Color& color) {
AddColorStop(ColorStop(value, color));
}
void AddColorStops(const Vector<Gradient::ColorStop>&);
void ApplyToFlags(cc::PaintFlags&,
const SkMatrix& local_matrix,
const ImageDrawOptions& draw_options);
void SetColorInterpolationSpace(
Color::ColorSpace color_space_interpolation_space,
Color::HueInterpolationMethod hue_interpolation_method) {
if (color_space_interpolation_space == color_space_interpolation_space_ &&
hue_interpolation_method == hue_interpolation_method_) {
return;
}
color_space_interpolation_space_ = color_space_interpolation_space;
hue_interpolation_method_ = hue_interpolation_method;
cached_shader_.reset();
}
void SetPremultipliedAlphaForInterpolation(bool premultiplied_alpha) {
PremultipliedAlpha color_interpolation =
premultiplied_alpha ? PremultipliedAlpha::kPremultiplied
: PremultipliedAlpha::kUnpremultiplied;
if (color_interpolation == premultiplied_alpha_) {
return;
}
premultiplied_alpha_ = color_interpolation;
cached_shader_.reset();
}
DarkModeFilter& EnsureDarkModeFilter();
protected:
Gradient(Type, SpreadMethod, PremultipliedAlpha, DegenerateHandling);
using ColorBuffer = Vector<SkColor4f, 8>;
using OffsetBuffer = Vector<SkScalar, 8>;
virtual sk_sp<PaintShader> CreateShader(const ColorBuffer&,
const OffsetBuffer&,
SkTileMode,
SkGradientShader::Interpolation,
const SkMatrix&,
SkColor4f) const = 0;
DegenerateHandling GetDegenerateHandling() const {
return degenerate_handling_;
}
private:
sk_sp<PaintShader> CreateShaderInternal(const SkMatrix& local_matrix);
SkGradientShader::Interpolation ResolveSkInterpolation() const;
void SortStopsIfNecessary() const;
void FillSkiaStops(ColorBuffer&, OffsetBuffer&) const;
bool HasNonLegacyColor() const;
const Type type_;
const SpreadMethod spread_method_;
PremultipliedAlpha premultiplied_alpha_ =
PremultipliedAlpha::kUnpremultiplied;
const DegenerateHandling degenerate_handling_;
mutable Vector<ColorStop, 2> stops_;
mutable bool stops_sorted_;
bool is_dark_mode_enabled_ = false;
std::unique_ptr<DarkModeFilter> dark_mode_filter_;
mutable sk_sp<PaintShader> cached_shader_;
mutable sk_sp<cc::ColorFilter> color_filter_;
Color::ColorSpace color_space_interpolation_space_ = Color::ColorSpace::kNone;
Color::HueInterpolationMethod hue_interpolation_method_ =
Color::HueInterpolationMethod::kShorter;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_GRADIENT_H_
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