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 13 /** \class SkPaintFilterCanvas 14 15 A utility proxy base class for implementing paint filters. 16 */ 17 class SK_API SkPaintFilterCanvas : public SkNWayCanvas { 18 public: 19 SkPaintFilterCanvas(int width, int height); 20 21 enum Type { 22 kPaint_Type, 23 kPoint_Type, 24 kBitmap_Type, 25 kRect_Type, 26 kRRect_Type, 27 kDRRect_Type, 28 kOval_Type, 29 kPath_Type, 30 kPicture_Type, 31 kText_Type, 32 kTextBlob_Type, 33 kVertices_Type, 34 kPatch_Type, 35 36 kTypeCount 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 * Note: The base implementation calls onFilterPaint() for top-level/explicit paints only. 45 * To also filter encapsulated paints (e.g. SkPicture, SkTextBlob), clients may need to 46 * override the relevant methods (i.e. drawPicture, drawTextBlob). 47 */ 48 virtual void onFilterPaint(SkPaint* paint, Type type) const = 0; 49 50 void onDrawPaint(const SkPaint&) override; 51 void onDrawPoints(PointMode, size_t count, const SkPoint pts[], const SkPaint&) override; 52 void onDrawRect(const SkRect&, const SkPaint&) override; 53 void onDrawRRect(const SkRRect&, const SkPaint&) override; 54 void onDrawDRRect(const SkRRect&, const SkRRect&, const SkPaint&) override; 55 void onDrawOval(const SkRect&, const SkPaint&) override; 56 void onDrawPath(const SkPath&, const SkPaint&) override; 57 void onDrawBitmap(const SkBitmap&, SkScalar left, SkScalar top, const SkPaint*) override; 58 void onDrawBitmapRect(const SkBitmap&, const SkRect* src, const SkRect& dst, const SkPaint*, 59 DrawBitmapRectFlags flags) override; 60 void onDrawImage(const SkImage*, SkScalar left, SkScalar top, const SkPaint*) override; 61 void onDrawImageRect(const SkImage*, const SkRect* src, const SkRect& dst, 62 const SkPaint*) override; 63 void onDrawBitmapNine(const SkBitmap&, const SkIRect& center, const SkRect& dst, 64 const SkPaint*) override; 65 void onDrawSprite(const SkBitmap&, int left, int top, const SkPaint*) override; 66 void onDrawVertices(VertexMode vmode, int vertexCount, 67 const SkPoint vertices[], const SkPoint texs[], 68 const SkColor colors[], SkXfermode* xmode, 69 const uint16_t indices[], int indexCount, 70 const SkPaint&) override; 71 void onDrawPatch(const SkPoint cubics[12], const SkColor colors[4], 72 const SkPoint texCoords[4], SkXfermode* xmode, 73 const SkPaint& paint) override; 74 void onDrawPicture(const SkPicture*, const SkMatrix*, const SkPaint*) override; 75 76 void onDrawText(const void* text, size_t byteLength, SkScalar x, SkScalar y, 77 const SkPaint&) override; 78 void onDrawPosText(const void* text, size_t byteLength, const SkPoint pos[], 79 const SkPaint&) override; 80 void onDrawPosTextH(const void* text, size_t byteLength, const SkScalar xpos[], 81 SkScalar constY, const SkPaint&) override; 82 void onDrawTextOnPath(const void* text, size_t byteLength, const SkPath& path, 83 const SkMatrix* matrix, const SkPaint&) override; 84 void onDrawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y, 85 const SkPaint& paint) override; 86 87 private: 88 class AutoPaintFilter; 89 90 typedef SkNWayCanvas INHERITED; 91 }; 92 93 #endif 94
