1 /* 2 * Copyright 2018 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 SkCanvasVirtualEnforcer_DEFINED 9 #define SkCanvasVirtualEnforcer_DEFINED 10 11 #include "include/core/SkCanvas.h" 12 13 // If you would ordinarily want to inherit from Base (eg SkCanvas, SkNWayCanvas), instead 14 // inherit from SkCanvasVirtualEnforcer<Base>, which will make the build fail if you forget 15 // to override one of SkCanvas' key virtual hooks. 16 template <typename Base> 17 class SkCanvasVirtualEnforcer : public Base { 18 public: 19 using Base::Base; 20 21 protected: 22 void onDrawPaint(const SkPaint& paint) override = 0; onDrawBehind(const SkPaint &)23 void onDrawBehind(const SkPaint&) override {} // make zero after android updates 24 void onDrawRect(const SkRect& rect, const SkPaint& paint) override = 0; 25 void onDrawRRect(const SkRRect& rrect, const SkPaint& paint) override = 0; 26 void onDrawDRRect(const SkRRect& outer, const SkRRect& inner, 27 const SkPaint& paint) override = 0; 28 void onDrawOval(const SkRect& rect, const SkPaint& paint) override = 0; 29 void onDrawArc(const SkRect& rect, SkScalar startAngle, SkScalar sweepAngle, bool useCenter, 30 const SkPaint& paint) override = 0; 31 void onDrawPath(const SkPath& path, const SkPaint& paint) override = 0; 32 void onDrawRegion(const SkRegion& region, const SkPaint& paint) override = 0; 33 34 void onDrawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y, 35 const SkPaint& paint) override = 0; 36 37 void onDrawPatch(const SkPoint cubics[12], const SkColor colors[4], 38 const SkPoint texCoords[4], SkBlendMode mode, 39 const SkPaint& paint) override = 0; 40 void onDrawPoints(SkCanvas::PointMode mode, size_t count, const SkPoint pts[], 41 const SkPaint& paint) override = 0; 42 43 #ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK 44 // This is under active development for Chrome and not used in Android. Hold off on adding 45 // implementations in Android's SkCanvas subclasses until this stabilizes. onDrawEdgeAAQuad(const SkRect & rect,const SkPoint clip[4],SkCanvas::QuadAAFlags aaFlags,const SkColor4f & color,SkBlendMode mode)46 void onDrawEdgeAAQuad(const SkRect& rect, const SkPoint clip[4], 47 SkCanvas::QuadAAFlags aaFlags, const SkColor4f& color, SkBlendMode mode) override {} 48 #else 49 void onDrawEdgeAAQuad(const SkRect& rect, const SkPoint clip[4], 50 SkCanvas::QuadAAFlags aaFlags, const SkColor4f& color, SkBlendMode mode) override = 0; 51 #endif 52 53 void onDrawAnnotation(const SkRect& rect, const char key[], SkData* value) override = 0; 54 void onDrawShadowRec(const SkPath&, const SkDrawShadowRec&) override = 0; 55 56 void onDrawDrawable(SkDrawable* drawable, const SkMatrix* matrix) override = 0; 57 void onDrawPicture(const SkPicture* picture, const SkMatrix* matrix, 58 const SkPaint* paint) override = 0; 59 }; 60 61 #endif 62