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 "SkNWayCanvas.h" 12 #include "SkTLazy.h" 13 14 /** \class SkPaintFilterCanvas 15 16 A utility proxy base class for implementing draw/paint filters. 17 */ 18 class SK_API SkPaintFilterCanvas : public SkNWayCanvas { 19 public: 20 /** 21 * DEPRECATED: use the variant below. 22 */ 23 SkPaintFilterCanvas(int width, int height); 24 25 /** 26 * The new SkPaintFilterCanvas is configured for forwarding to the 27 * specified canvas. Also copies the target canvas matrix and clip bounds. 28 */ 29 SkPaintFilterCanvas(SkCanvas* canvas); 30 31 enum Type { 32 kPaint_Type, 33 kPoint_Type, 34 kBitmap_Type, 35 kRect_Type, 36 kRRect_Type, 37 kDRRect_Type, 38 kOval_Type, 39 kPath_Type, 40 kPicture_Type, 41 kText_Type, 42 kTextBlob_Type, 43 kVertices_Type, 44 kPatch_Type, 45 46 kTypeCount 47 }; 48 49 protected: 50 /** 51 * Called with the paint that will be used to draw the specified type. 52 * The implementation may modify the paint as they wish (using SkTCopyOnFirstWrite::writable). 53 * 54 * The result bool is used to determine whether the draw op is to be 55 * executed (true) or skipped (false). 56 * 57 * Note: The base implementation calls onFilter() for top-level/explicit paints only. 58 * To also filter encapsulated paints (e.g. SkPicture, SkTextBlob), clients may need to 59 * override the relevant methods (i.e. drawPicture, drawTextBlob). 60 */ 61 virtual bool onFilter(SkTCopyOnFirstWrite<SkPaint>* paint, Type type) const = 0; 62 63 void onDrawPaint(const SkPaint&) override; 64 void onDrawPoints(PointMode, size_t count, const SkPoint pts[], const SkPaint&) override; 65 void onDrawRect(const SkRect&, const SkPaint&) override; 66 void onDrawRRect(const SkRRect&, const SkPaint&) override; 67 void onDrawDRRect(const SkRRect&, const SkRRect&, const SkPaint&) override; 68 void onDrawOval(const SkRect&, const SkPaint&) override; 69 void onDrawPath(const SkPath&, const SkPaint&) override; 70 void onDrawBitmap(const SkBitmap&, SkScalar left, SkScalar top, const SkPaint*) override; 71 void onDrawBitmapRect(const SkBitmap&, const SkRect* src, const SkRect& dst, const SkPaint*, 72 SrcRectConstraint) override; 73 void onDrawBitmapNine(const SkBitmap&, const SkIRect& center, const SkRect& dst, 74 const SkPaint*) override; 75 void onDrawImage(const SkImage*, SkScalar left, SkScalar top, const SkPaint*) override; 76 void onDrawImageRect(const SkImage*, const SkRect* src, const SkRect& dst, 77 const SkPaint*, SrcRectConstraint) override; 78 void onDrawImageNine(const SkImage*, const SkIRect& center, const SkRect& dst, 79 const SkPaint*) override; 80 void onDrawVertices(VertexMode vmode, int vertexCount, 81 const SkPoint vertices[], const SkPoint texs[], 82 const SkColor colors[], SkXfermode* xmode, 83 const uint16_t indices[], int indexCount, 84 const SkPaint&) override; 85 void onDrawPatch(const SkPoint cubics[12], const SkColor colors[4], 86 const SkPoint texCoords[4], SkXfermode* xmode, 87 const SkPaint& paint) override; 88 void onDrawPicture(const SkPicture*, const SkMatrix*, const SkPaint*) override; 89 90 void onDrawText(const void* text, size_t byteLength, SkScalar x, SkScalar y, 91 const SkPaint&) override; 92 void onDrawPosText(const void* text, size_t byteLength, const SkPoint pos[], 93 const SkPaint&) override; 94 void onDrawPosTextH(const void* text, size_t byteLength, const SkScalar xpos[], 95 SkScalar constY, const SkPaint&) override; 96 void onDrawTextOnPath(const void* text, size_t byteLength, const SkPath& path, 97 const SkMatrix* matrix, const SkPaint&) override; 98 void onDrawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y, 99 const SkPaint& paint) override; 100 101 private: 102 class AutoPaintFilter; 103 104 typedef SkNWayCanvas INHERITED; 105 }; 106 107 #endif 108
