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31 #ifndef RegionTracker_h
32 #define RegionTracker_h
34 #include "platform/PlatformExport.h"
35 #include "platform/geometry/IntRect.h"
36 #include "third_party/skia/include/core/SkBitmap.h"
37 #include "third_party/skia/include/core/SkCanvas.h"
38 #include "third_party/skia/include/core/SkPaint.h"
39 #include "third_party/skia/include/core/SkPoint.h"
40 #include "third_party/skia/include/core/SkRect.h"
43 class GraphicsContext;
45 enum RegionTrackingMode {
50 // This class is an encapsulation of functionality for GraphicsContext, and its methods are mirrored
51 // there for the outside world. It tracks paints and computes what area will be opaque.
52 class PLATFORM_EXPORT RegionTracker FINAL {
56 // The resulting opaque region as a single rect.
57 IntRect asRect() const;
59 void pushCanvasLayer(const SkPaint*);
60 void popCanvasLayer(const GraphicsContext*);
62 void setImageMask(const SkRect& imageOpaqueRect);
69 // Set this to true to track regions that occlude the destination instead of only regions that produce opaque pixels.
70 void setTrackedRegionType(RegionType type) { m_trackedRegionType = type; }
77 void didDrawRect(const GraphicsContext*, const SkRect&, const SkPaint&, const SkBitmap* sourceBitmap);
78 void didDrawPath(const GraphicsContext*, const SkPath&, const SkPaint&);
79 void didDrawPoints(const GraphicsContext*, SkCanvas::PointMode, int numPoints, const SkPoint[], const SkPaint&);
80 void didDrawBounded(const GraphicsContext*, const SkRect&, const SkPaint&);
81 void didDrawUnbounded(const GraphicsContext*, const SkPaint&, DrawType);
83 struct CanvasLayerState {
86 , opaqueRect(SkRect::MakeEmpty())
91 // An image mask is being applied to the layer.
93 // The opaque area in the image mask.
94 SkRect imageOpaqueRect;
102 void didDraw(const GraphicsContext*, const SkRect&, const SkPaint&, const SkBitmap* sourceBitmap, bool fillsBounds, DrawType);
103 void applyOpaqueRegionFromLayer(const GraphicsContext*, const SkRect& layerOpaqueRect, const SkPaint&);
104 void markRectAsOpaque(const SkRect&);
105 void markRectAsNonOpaque(const SkRect&);
106 void markAllAsNonOpaque();
108 SkRect& currentTrackingOpaqueRect();
111 RegionType m_trackedRegionType;
113 Vector<CanvasLayerState, 3> m_canvasLayerStack;
118 #endif // RegionTracker_h