1 /* 2 * Copyright 2016 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 SkNoDrawCanvas_DEFINED 9 #define SkNoDrawCanvas_DEFINED 10 11 #include "include/core/SkCanvas.h" 12 #include "include/core/SkCanvasVirtualEnforcer.h" 13 14 struct SkIRect; 15 16 // SkNoDrawCanvas is a helper for SkCanvas subclasses which do not need to 17 // actually rasterize (e.g., analysis of the draw calls). 18 // 19 // It provides the following simplifications: 20 // 21 // * not backed by any device/pixels 22 // * conservative clipping (clipping calls only use rectangles) 23 // 24 class SK_API SkNoDrawCanvas : public SkCanvasVirtualEnforcer<SkCanvas> { 25 public: 26 SkNoDrawCanvas(int width, int height); 27 SkNoDrawCanvas(const SkIRect&); 28 29 explicit SkNoDrawCanvas(sk_sp<SkBaseDevice> device); 30 31 // Optimization to reset state to be the same as after construction. resetCanvas(int w,int h)32 void resetCanvas(int w, int h) { this->resetForNextPicture(SkIRect::MakeWH(w, h)); } resetCanvas(const SkIRect & rect)33 void resetCanvas(const SkIRect& rect) { this->resetForNextPicture(rect); } 34 35 protected: 36 SaveLayerStrategy getSaveLayerStrategy(const SaveLayerRec& rec) override; 37 bool onDoSaveBehind(const SkRect*) override; 38 39 // No-op overrides for aborting rasterization earlier than SkNullBlitter. onDrawAnnotation(const SkRect &,const char[],SkData *)40 void onDrawAnnotation(const SkRect&, const char[], SkData*) override {} onDrawDRRect(const SkRRect &,const SkRRect &,const SkPaint &)41 void onDrawDRRect(const SkRRect&, const SkRRect&, const SkPaint&) override {} onDrawDrawable(SkDrawable *,const SkMatrix *)42 void onDrawDrawable(SkDrawable*, const SkMatrix*) override {} onDrawTextBlob(const SkTextBlob *,SkScalar,SkScalar,const SkPaint &)43 void onDrawTextBlob(const SkTextBlob*, SkScalar, SkScalar, const SkPaint&) override {} onDrawPatch(const SkPoint[12],const SkColor[4],const SkPoint[4],SkBlendMode,const SkPaint &)44 void onDrawPatch(const SkPoint[12], const SkColor[4], const SkPoint[4], SkBlendMode, 45 const SkPaint&) override {} 46 onDrawPaint(const SkPaint &)47 void onDrawPaint(const SkPaint&) override {} onDrawBehind(const SkPaint &)48 void onDrawBehind(const SkPaint&) override {} onDrawPoints(PointMode,size_t,const SkPoint[],const SkPaint &)49 void onDrawPoints(PointMode, size_t, const SkPoint[], const SkPaint&) override {} onDrawRect(const SkRect &,const SkPaint &)50 void onDrawRect(const SkRect&, const SkPaint&) override {} onDrawRegion(const SkRegion &,const SkPaint &)51 void onDrawRegion(const SkRegion&, const SkPaint&) override {} onDrawOval(const SkRect &,const SkPaint &)52 void onDrawOval(const SkRect&, const SkPaint&) override {} onDrawArc(const SkRect &,SkScalar,SkScalar,bool,const SkPaint &)53 void onDrawArc(const SkRect&, SkScalar, SkScalar, bool, const SkPaint&) override {} onDrawRRect(const SkRRect &,const SkPaint &)54 void onDrawRRect(const SkRRect&, const SkPaint&) override {} onDrawPath(const SkPath &,const SkPaint &)55 void onDrawPath(const SkPath&, const SkPaint&) override {} 56 onDrawImage2(const SkImage *,SkScalar,SkScalar,const SkSamplingOptions &,const SkPaint *)57 void onDrawImage2(const SkImage*, SkScalar, SkScalar, const SkSamplingOptions&, 58 const SkPaint*) override {} onDrawImageRect2(const SkImage *,const SkRect &,const SkRect &,const SkSamplingOptions &,const SkPaint *,SrcRectConstraint)59 void onDrawImageRect2(const SkImage*, const SkRect&, const SkRect&, const SkSamplingOptions&, 60 const SkPaint*, SrcRectConstraint) override {} onDrawImageLattice2(const SkImage *,const Lattice &,const SkRect &,SkFilterMode,const SkPaint *)61 void onDrawImageLattice2(const SkImage*, const Lattice&, const SkRect&, SkFilterMode, 62 const SkPaint*) override {} onDrawAtlas2(const SkImage *,const SkRSXform[],const SkRect[],const SkColor[],int,SkBlendMode,const SkSamplingOptions &,const SkRect *,const SkPaint *)63 void onDrawAtlas2(const SkImage*, const SkRSXform[], const SkRect[], const SkColor[], int, 64 SkBlendMode, const SkSamplingOptions&, const SkRect*, const SkPaint*) override {} 65 onDrawVerticesObject(const SkVertices *,SkBlendMode,const SkPaint &)66 void onDrawVerticesObject(const SkVertices*, SkBlendMode, const SkPaint&) override {} onDrawShadowRec(const SkPath &,const SkDrawShadowRec &)67 void onDrawShadowRec(const SkPath&, const SkDrawShadowRec&) override {} onDrawPicture(const SkPicture *,const SkMatrix *,const SkPaint *)68 void onDrawPicture(const SkPicture*, const SkMatrix*, const SkPaint*) override {} 69 onDrawEdgeAAQuad(const SkRect &,const SkPoint[4],QuadAAFlags,const SkColor4f &,SkBlendMode)70 void onDrawEdgeAAQuad(const SkRect&, const SkPoint[4], QuadAAFlags, const SkColor4f&, 71 SkBlendMode) override {} onDrawEdgeAAImageSet2(const ImageSetEntry[],int,const SkPoint[],const SkMatrix[],const SkSamplingOptions &,const SkPaint *,SrcRectConstraint)72 void onDrawEdgeAAImageSet2(const ImageSetEntry[], int, const SkPoint[], const SkMatrix[], 73 const SkSamplingOptions&, const SkPaint*, 74 SrcRectConstraint) override {} 75 76 private: 77 using INHERITED = SkCanvasVirtualEnforcer<SkCanvas>; 78 }; 79 80 #endif // SkNoDrawCanvas_DEFINED 81