1 /* 2 * Copyright 2015 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef SkPaintFilterCanvas_DEFINED 9 #define SkPaintFilterCanvas_DEFINED 10 11 #include "include/core/SkCanvasVirtualEnforcer.h" 12 #include "include/utils/SkNWayCanvas.h" 13 14 class SkAndroidFrameworkUtils; 15 16 /** \class SkPaintFilterCanvas 17 18 A utility proxy base class for implementing draw/paint filters. 19 */ 20 class SK_API SkPaintFilterCanvas : public SkCanvasVirtualEnforcer<SkNWayCanvas> { 21 public: 22 /** 23 * The new SkPaintFilterCanvas is configured for forwarding to the 24 * specified canvas. Also copies the target canvas matrix and clip bounds. 25 */ 26 SkPaintFilterCanvas(SkCanvas* canvas); 27 28 enum Type { 29 kPicture_Type, 30 }; 31 32 // Forwarded to the wrapped canvas. getBaseLayerSize()33 SkISize getBaseLayerSize() const override { return proxy()->getBaseLayerSize(); } getGrContext()34 GrContext* getGrContext() override { return proxy()->getGrContext(); } internal_private_accessTopLayerRenderTargetContext()35 GrRenderTargetContext* internal_private_accessTopLayerRenderTargetContext() override { 36 return proxy()->internal_private_accessTopLayerRenderTargetContext(); 37 } 38 39 protected: 40 /** 41 * Called with the paint that will be used to draw the specified type. 42 * The implementation may modify the paint as they wish. 43 * 44 * The result bool is used to determine whether the draw op is to be 45 * executed (true) or skipped (false). 46 * 47 * Note: The base implementation calls onFilter() for top-level/explicit paints only. 48 * To also filter encapsulated paints (e.g. SkPicture, SkTextBlob), clients may need to 49 * override the relevant methods (i.e. drawPicture, drawTextBlob). 50 */ 51 virtual bool onFilter(SkPaint& paint) const = 0; 52 53 void onDrawPaint(const SkPaint&) override; 54 void onDrawBehind(const SkPaint&) override; 55 void onDrawPoints(PointMode, size_t count, const SkPoint pts[], const SkPaint&) override; 56 void onDrawRect(const SkRect&, const SkPaint&) override; 57 void onDrawRRect(const SkRRect&, const SkPaint&) override; 58 void onDrawDRRect(const SkRRect&, const SkRRect&, const SkPaint&) override; 59 void onDrawRegion(const SkRegion&, const SkPaint&) override; 60 void onDrawOval(const SkRect&, const SkPaint&) override; 61 void onDrawArc(const SkRect&, SkScalar, SkScalar, bool, const SkPaint&) override; 62 void onDrawPath(const SkPath&, const SkPaint&) override; 63 void onDrawBitmap(const SkBitmap&, SkScalar left, SkScalar top, const SkPaint*) override; 64 void onDrawBitmapRect(const SkBitmap&, const SkRect* src, const SkRect& dst, const SkPaint*, 65 SrcRectConstraint) override; 66 void onDrawBitmapNine(const SkBitmap&, const SkIRect& center, const SkRect& dst, 67 const SkPaint*) override; 68 void onDrawBitmapLattice(const SkBitmap&, const Lattice&, const SkRect&, 69 const SkPaint*) override; 70 void onDrawImage(const SkImage*, SkScalar left, SkScalar top, const SkPaint*) override; 71 void onDrawImageRect(const SkImage*, const SkRect* src, const SkRect& dst, 72 const SkPaint*, SrcRectConstraint) override; 73 void onDrawImageNine(const SkImage*, const SkIRect& center, const SkRect& dst, 74 const SkPaint*) override; 75 void onDrawImageLattice(const SkImage*, const Lattice&, const SkRect&, 76 const SkPaint*) override; 77 void onDrawVerticesObject(const SkVertices*, const SkVertices::Bone bones[], int boneCount, 78 SkBlendMode, const SkPaint&) override; 79 void onDrawPatch(const SkPoint cubics[12], const SkColor colors[4], 80 const SkPoint texCoords[4], SkBlendMode, 81 const SkPaint& paint) override; 82 void onDrawPicture(const SkPicture*, const SkMatrix*, const SkPaint*) override; 83 void onDrawDrawable(SkDrawable*, const SkMatrix*) override; 84 85 void onDrawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y, 86 const SkPaint& paint) override; 87 void onDrawAtlas(const SkImage*, const SkRSXform[], const SkRect[], const SkColor[], 88 int, SkBlendMode, const SkRect*, const SkPaint*) override; 89 void onDrawAnnotation(const SkRect& rect, const char key[], SkData* value) override; 90 void onDrawShadowRec(const SkPath& path, const SkDrawShadowRec& rec) override; 91 92 void onDrawEdgeAAQuad(const SkRect&, const SkPoint[4], QuadAAFlags, const SkColor4f&, 93 SkBlendMode) override; 94 void onDrawEdgeAAImageSet(const ImageSetEntry[], int count, const SkPoint[], const SkMatrix[], 95 const SkPaint*, SrcRectConstraint) override; 96 97 // Forwarded to the wrapped canvas. 98 sk_sp<SkSurface> onNewSurface(const SkImageInfo&, const SkSurfaceProps&) override; 99 bool onPeekPixels(SkPixmap* pixmap) override; 100 bool onAccessTopLayerPixels(SkPixmap* pixmap) override; 101 SkImageInfo onImageInfo() const override; 102 bool onGetProps(SkSurfaceProps* props) const override; 103 104 private: 105 class AutoPaintFilter; 106 proxy()107 SkCanvas* proxy() const { SkASSERT(fList.count() == 1); return fList[0]; } 108 internal_private_asPaintFilterCanvas()109 SkPaintFilterCanvas* internal_private_asPaintFilterCanvas() const override { 110 return const_cast<SkPaintFilterCanvas*>(this); 111 } 112 113 friend class SkAndroidFrameworkUtils; 114 }; 115 116 #endif 117