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// 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:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * 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.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "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 THE COPYRIGHT
// OWNER 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 GraphicsContextState_h
#define GraphicsContextState_h
#include "platform/graphics/DrawLooperBuilder.h"
#include "platform/graphics/Gradient.h"
#include "platform/graphics/GraphicsTypes.h"
#include "platform/graphics/Path.h"
#include "platform/graphics/Pattern.h"
#include "platform/graphics/StrokeData.h"
#include "third_party/skia/include/core/SkColorFilter.h"
#include "third_party/skia/include/core/SkImageFilter.h"
#include "third_party/skia/include/core/SkPaint.h"
#include "wtf/PassOwnPtr.h"
#include "wtf/RefPtr.h"
namespace blink {
// Encapsulates the state information we store for each pushed graphics state.
// Only GraphicsContext can use this class.
class PLATFORM_EXPORT GraphicsContextState final {
public:
static PassOwnPtr<GraphicsContextState> create()
{
return adoptPtr(new GraphicsContextState());
}
static PassOwnPtr<GraphicsContextState> createAndCopy(const GraphicsContextState& other)
{
return adoptPtr(new GraphicsContextState(other));
}
void copy(const GraphicsContextState&);
// SkPaint objects that reflect the current state. If the length of the
// path to be stroked is known, pass it in for correct dash or dot placement.
const SkPaint& strokePaint(int strokedPathLength = 0) const;
const SkPaint& fillPaint() const;
uint16_t saveCount() const { return m_saveCount; }
void incrementSaveCount() { ++m_saveCount; }
void decrementSaveCount() { --m_saveCount; }
// Stroke data
Color strokeColor() const { return m_strokeColor; }
SkColor effectiveStrokeColor() const { return applyAlpha(m_strokeColor.rgb()); }
void setStrokeColor(const Color&);
Gradient* strokeGradient() const { return m_strokeGradient.get(); }
void setStrokeGradient(const PassRefPtr<Gradient>);
void clearStrokeGradient();
Pattern* strokePattern() const { return m_strokePattern.get(); }
void setStrokePattern(const PassRefPtr<Pattern>);
void clearStrokePattern();
const StrokeData& strokeData() const { return m_strokeData; }
void setStrokeStyle(StrokeStyle);
void setStrokeThickness(float);
void setLineCap(LineCap);
void setLineJoin(LineJoin);
void setMiterLimit(float);
void setLineDash(const DashArray&, float);
// Fill data
Color fillColor() const { return m_fillColor; }
SkColor effectiveFillColor() const { return applyAlpha(m_fillColor.rgb()); }
void setFillColor(const Color&);
Gradient* fillGradient() const { return m_fillGradient.get(); }
void setFillGradient(const PassRefPtr<Gradient>);
void clearFillGradient();
Pattern* fillPattern() const { return m_fillPattern.get(); }
void setFillPattern(const PassRefPtr<Pattern>);
void clearFillPattern();
// Path fill rule
WindRule fillRule() const { return m_fillRule; }
void setFillRule(WindRule rule) { m_fillRule = rule; }
// Shadow. (This will need tweaking if we use draw loopers for other things.)
SkDrawLooper* drawLooper() const { return m_looper.get(); }
void setDrawLooper(PassRefPtr<SkDrawLooper>);
void clearDrawLooper();
SkImageFilter* dropShadowImageFilter() const { return m_dropShadowImageFilter.get(); }
void setDropShadowImageFilter(PassRefPtr<SkImageFilter>);
void clearDropShadowImageFilter();
// Text. (See TextModeFill & friends.)
TextDrawingModeFlags textDrawingMode() const { return m_textDrawingMode; }
void setTextDrawingMode(TextDrawingModeFlags mode) { m_textDrawingMode = mode; }
// Common shader state.
int alpha() const { return m_alpha; }
void setAlphaAsFloat(float);
SkColorFilter* colorFilter() const { return m_colorFilter.get(); }
void setColorFilter(PassRefPtr<SkColorFilter>);
// Compositing control, for the CSS and Canvas compositing spec.
void setCompositeOperation(CompositeOperator, WebBlendMode);
CompositeOperator compositeOperator() const { return m_compositeOperator; }
WebBlendMode blendMode() const { return m_blendMode; }
// Image interpolation control.
InterpolationQuality interpolationQuality() const { return m_interpolationQuality; }
void setInterpolationQuality(InterpolationQuality);
bool shouldAntialias() const { return m_shouldAntialias; }
void setShouldAntialias(bool);
bool shouldClampToSourceRect() const { return m_shouldClampToSourceRect; }
void setShouldClampToSourceRect(bool shouldClampToSourceRect) { m_shouldClampToSourceRect = shouldClampToSourceRect; }
private:
GraphicsContextState();
explicit GraphicsContextState(const GraphicsContextState&);
GraphicsContextState& operator=(const GraphicsContextState&);
// Helper function for applying the state's alpha value to the given input
// color to produce a new output color.
SkColor applyAlpha(SkColor c) const
{
int a = SkAlphaMul(SkColorGetA(c), m_alpha);
return (c & 0x00FFFFFF) | (a << 24);
}
// These are mutbale to enable gradient updates when the paints are fetched for use.
mutable SkPaint m_strokePaint;
mutable SkPaint m_fillPaint;
StrokeData m_strokeData;
Color m_strokeColor;
RefPtr<Gradient> m_strokeGradient;
RefPtr<Pattern> m_strokePattern;
Color m_fillColor;
WindRule m_fillRule;
RefPtr<Gradient> m_fillGradient;
RefPtr<Pattern> m_fillPattern;
RefPtr<SkDrawLooper> m_looper;
RefPtr<SkImageFilter> m_dropShadowImageFilter;
TextDrawingModeFlags m_textDrawingMode;
int m_alpha;
RefPtr<SkColorFilter> m_colorFilter;
CompositeOperator m_compositeOperator;
WebBlendMode m_blendMode;
InterpolationQuality m_interpolationQuality;
uint16_t m_saveCount;
bool m_shouldAntialias : 1;
bool m_shouldClampToSourceRect : 1;
};
} // namespace blink
#endif // GraphicsContextState_h
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