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 "SkCanvas.h"
12 #include "SkVertices.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 SkCanvas {
25 public:
26     SkNoDrawCanvas(int width, int height);
27 
28     // TODO: investigate the users of this ctor.
29     SkNoDrawCanvas(const SkIRect&);
30 
31     // Optimization to reset state to be the same as after construction.
resetCanvas(int width,int height)32     void resetCanvas(int width, int height) {
33         resetForNextPicture(SkIRect::MakeWH(width, height));
34     }
35 
36 protected:
37     SaveLayerStrategy getSaveLayerStrategy(const SaveLayerRec& rec) override;
38 
39     // No-op overrides for aborting rasterization earlier than SkNullBlitter.
onDrawDRRect(const SkRRect &,const SkRRect &,const SkPaint &)40     void onDrawDRRect(const SkRRect&, const SkRRect&, const SkPaint&) override {}
onDrawDrawable(SkDrawable *,const SkMatrix *)41     void onDrawDrawable(SkDrawable*, const SkMatrix*) override {}
onDrawText(const void *,size_t,SkScalar,SkScalar,const SkPaint &)42     void onDrawText(const void*, size_t, SkScalar, SkScalar, const SkPaint&) override {}
onDrawPosText(const void *,size_t,const SkPoint[],const SkPaint &)43     void onDrawPosText(const void*, size_t, const SkPoint[], const SkPaint&) override {}
onDrawPosTextH(const void *,size_t,const SkScalar[],SkScalar,const SkPaint &)44     void onDrawPosTextH(const void*, size_t, const SkScalar[], SkScalar, const SkPaint&) override {}
onDrawTextOnPath(const void *,size_t,const SkPath &,const SkMatrix *,const SkPaint &)45     void onDrawTextOnPath(const void*, size_t, const SkPath&, const SkMatrix*,
46                           const SkPaint&) override {}
onDrawTextRSXform(const void *,size_t,const SkRSXform[],const SkRect *,const SkPaint &)47     void onDrawTextRSXform(const void*, size_t, const SkRSXform[], const SkRect*,
48                            const SkPaint&) override {}
onDrawTextBlob(const SkTextBlob *,SkScalar,SkScalar,const SkPaint &)49     void onDrawTextBlob(const SkTextBlob*, SkScalar, SkScalar, const SkPaint&) override {}
onDrawPatch(const SkPoint[12],const SkColor[4],const SkPoint[4],SkBlendMode,const SkPaint &)50     void onDrawPatch(const SkPoint[12], const SkColor[4], const SkPoint[4], SkBlendMode,
51                      const SkPaint&) override {}
52 
onDrawPaint(const SkPaint &)53     void onDrawPaint(const SkPaint&) override {}
onDrawPoints(PointMode,size_t,const SkPoint[],const SkPaint &)54     void onDrawPoints(PointMode, size_t, const SkPoint[], const SkPaint&) override {}
onDrawRect(const SkRect &,const SkPaint &)55     void onDrawRect(const SkRect&, const SkPaint&) override {}
onDrawRegion(const SkRegion &,const SkPaint &)56     void onDrawRegion(const SkRegion&, const SkPaint&) override {}
onDrawOval(const SkRect &,const SkPaint &)57     void onDrawOval(const SkRect&, const SkPaint&) override {}
onDrawArc(const SkRect &,SkScalar,SkScalar,bool,const SkPaint &)58     void onDrawArc(const SkRect&, SkScalar, SkScalar, bool, const SkPaint&) override {}
onDrawRRect(const SkRRect &,const SkPaint &)59     void onDrawRRect(const SkRRect&, const SkPaint&) override {}
onDrawPath(const SkPath &,const SkPaint &)60     void onDrawPath(const SkPath&, const SkPaint&) override {}
onDrawBitmap(const SkBitmap &,SkScalar,SkScalar,const SkPaint *)61     void onDrawBitmap(const SkBitmap&, SkScalar, SkScalar, const SkPaint*) override {}
onDrawBitmapRect(const SkBitmap &,const SkRect *,const SkRect &,const SkPaint *,SrcRectConstraint)62     void onDrawBitmapRect(const SkBitmap&, const SkRect*, const SkRect&, const SkPaint*,
63                           SrcRectConstraint) override {}
onDrawImage(const SkImage *,SkScalar,SkScalar,const SkPaint *)64     void onDrawImage(const SkImage*, SkScalar, SkScalar, const SkPaint*) override {}
onDrawImageRect(const SkImage *,const SkRect *,const SkRect &,const SkPaint *,SrcRectConstraint)65     void onDrawImageRect(const SkImage*, const SkRect*, const SkRect&, const SkPaint*,
66                          SrcRectConstraint) override {}
onDrawImageNine(const SkImage *,const SkIRect &,const SkRect &,const SkPaint *)67     void onDrawImageNine(const SkImage*, const SkIRect&, const SkRect&, const SkPaint*) override {}
onDrawBitmapNine(const SkBitmap &,const SkIRect &,const SkRect &,const SkPaint *)68     void onDrawBitmapNine(const SkBitmap&, const SkIRect&, const SkRect&,
69                           const SkPaint*) override {}
onDrawImageLattice(const SkImage *,const Lattice &,const SkRect &,const SkPaint *)70     void onDrawImageLattice(const SkImage*, const Lattice&, const SkRect&,
71                             const SkPaint*) override {}
onDrawBitmapLattice(const SkBitmap &,const Lattice &,const SkRect &,const SkPaint *)72     void onDrawBitmapLattice(const SkBitmap&, const Lattice&, const SkRect&,
73                              const SkPaint*) override {}
onDrawVerticesObject(const SkVertices *,SkBlendMode,const SkPaint &)74     void onDrawVerticesObject(const SkVertices*, SkBlendMode, const SkPaint&) override {}
onDrawAtlas(const SkImage *,const SkRSXform[],const SkRect[],const SkColor[],int,SkBlendMode,const SkRect *,const SkPaint *)75     void onDrawAtlas(const SkImage*, const SkRSXform[], const SkRect[], const SkColor[],
76                      int, SkBlendMode, const SkRect*, const SkPaint*) override {}
77 
78 private:
79     typedef SkCanvas INHERITED;
80 };
81 
82 #endif // SkNoDrawCanvas_DEFINED
83