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.
16template <typename Base>
17class SkCanvasVirtualEnforcer : public Base {
18public:
19    using Base::Base;
20
21protected:
22    void onDrawPaint(const SkPaint& paint) override = 0;
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.
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