| // 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 SKY_ENGINE_PLATFORM_GRAPHICS_GRAPHICSCONTEXTSTATE_H_ |
| #define SKY_ENGINE_PLATFORM_GRAPHICS_GRAPHICSCONTEXTSTATE_H_ |
| |
| #include "sky/engine/platform/graphics/DrawLooperBuilder.h" |
| #include "sky/engine/platform/graphics/Gradient.h" |
| #include "sky/engine/platform/graphics/GraphicsTypes.h" |
| #include "sky/engine/platform/graphics/Path.h" |
| #include "sky/engine/platform/graphics/Pattern.h" |
| #include "sky/engine/platform/graphics/StrokeData.h" |
| #include "sky/engine/wtf/PassOwnPtr.h" |
| #include "sky/engine/wtf/RefPtr.h" |
| #include "third_party/skia/include/core/SkColorFilter.h" |
| #include "third_party/skia/include/core/SkPaint.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 |
| const StrokeData& strokeData() const { return m_strokeData; } |
| |
| void setStrokeStyle(StrokeStyle); |
| |
| void setStrokeThickness(float); |
| |
| SkColor effectiveStrokeColor() const { return applyAlpha(m_strokeData.color().rgb()); } |
| void setStrokeColor(const Color&); |
| |
| void setStrokeGradient(const PassRefPtr<Gradient>); |
| void clearStrokeGradient(); |
| |
| void setStrokePattern(const PassRefPtr<Pattern>); |
| void clearStrokePattern(); |
| |
| 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(); |
| |
| // 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_fillColor; |
| WindRule m_fillRule; |
| RefPtr<Gradient> m_fillGradient; |
| RefPtr<Pattern> m_fillPattern; |
| |
| RefPtr<SkDrawLooper> m_looper; |
| |
| 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 // SKY_ENGINE_PLATFORM_GRAPHICS_GRAPHICSCONTEXTSTATE_H_ |