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123 lines
4.5 KiB
C++
123 lines
4.5 KiB
C++
/*
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* Copyright (c) 2012, Google Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef SKY_ENGINE_PLATFORM_GRAPHICS_REGIONTRACKER_H_
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#define SKY_ENGINE_PLATFORM_GRAPHICS_REGIONTRACKER_H_
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#include "flutter/sky/engine/platform/PlatformExport.h"
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#include "flutter/sky/engine/platform/geometry/IntRect.h"
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#include "third_party/skia/include/core/SkBitmap.h"
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#include "third_party/skia/include/core/SkCanvas.h"
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#include "third_party/skia/include/core/SkPaint.h"
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#include "third_party/skia/include/core/SkPoint.h"
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#include "third_party/skia/include/core/SkRect.h"
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namespace blink {
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class GraphicsContext;
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enum RegionTrackingMode { TrackOpaqueRegion, TRackOverwriteRegion };
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// This class is an encapsulation of functionality for GraphicsContext, and its
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// methods are mirrored there for the outside world. It tracks paints and
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// computes what area will be opaque.
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class PLATFORM_EXPORT RegionTracker final {
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public:
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RegionTracker();
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// The resulting opaque region as a single rect.
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IntRect asRect() const;
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void pushCanvasLayer(const SkPaint*);
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void popCanvasLayer(const GraphicsContext*);
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void setImageMask(const SkRect& imageOpaqueRect);
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enum RegionType { Opaque, Overwrite };
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// Set this to true to track regions that occlude the destination instead of
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// only regions that produce opaque pixels.
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void setTrackedRegionType(RegionType type) { m_trackedRegionType = type; }
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enum DrawType { FillOnly, FillOrStroke };
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void didDrawRect(const GraphicsContext*,
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const SkRect&,
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const SkPaint&,
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const SkBitmap* sourceBitmap);
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void didDrawPath(const GraphicsContext*, const SkPath&, const SkPaint&);
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void didDrawPoints(const GraphicsContext*,
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SkCanvas::PointMode,
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int numPoints,
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const SkPoint[],
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const SkPaint&);
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void didDrawBounded(const GraphicsContext*, const SkRect&, const SkPaint&);
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void didDrawUnbounded(const GraphicsContext*, const SkPaint&, DrawType);
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struct CanvasLayerState {
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CanvasLayerState() : hasImageMask(false), opaqueRect(SkRect::MakeEmpty()) {}
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SkPaint paint;
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// An image mask is being applied to the layer.
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bool hasImageMask;
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// The opaque area in the image mask.
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SkRect imageOpaqueRect;
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SkRect opaqueRect;
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};
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void reset();
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private:
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void didDraw(const GraphicsContext*,
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const SkRect&,
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const SkPaint&,
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const SkBitmap* sourceBitmap,
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bool fillsBounds,
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DrawType);
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void applyOpaqueRegionFromLayer(const GraphicsContext*,
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const SkRect& layerOpaqueRect,
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const SkPaint&);
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void markRectAsOpaque(const SkRect&);
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void markRectAsNonOpaque(const SkRect&);
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void markAllAsNonOpaque();
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SkRect& currentTrackingOpaqueRect();
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SkRect m_opaqueRect;
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RegionType m_trackedRegionType;
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Vector<CanvasLayerState, 3> m_canvasLayerStack;
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};
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} // namespace blink
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#endif // SKY_ENGINE_PLATFORM_GRAPHICS_REGIONTRACKER_H_
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