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| 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/explic
it paints only. |
| 45 * To also filter encapsulated paints (e.g. SkPicture, SkTextBlob), c
lients 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 SkPain
t&) 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 SkPain
t*) 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*) overri
de; |
| 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*) overri
de; |
| 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& pat
h, |
| 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 |
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