Shim to enforce that canvas virtuals are overridden

Change-Id: Iad70d449bbc43195baefd70d20c41996a8435e6e
Reviewed-on: https://skia-review.googlesource.com/113320
Reviewed-by: Mike Reed <reed@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Brian Osman <brianosman@google.com>

1 files changed, 85 insertions, 0 deletions

diff --git a/include/core/SkCanvasVirtualEnforcer.h b/include/core/SkCanvasVirtualEnforcer.h
new file mode 100644
index 0000000000..1999802170
--- /dev/null
+++ b/include/core/SkCanvasVirtualEnforcer.h
@@ -0,0 +1,85 @@
+/*
+ * Copyright 2018 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkCanvasVirtualEnforcer_DEFINED
+#define SkCanvasVirtualEnforcer_DEFINED
+
+#include "SkCanvas.h"
+
+// If you would ordinarily want to inherit from Base (eg SkCanvas, SkNWayCanvas), instead
+// inherit from SkCanvasVirtualEnforcer<Base>, which will make the build fail if you forget
+// to override one of SkCanvas' key virtual hooks.
+template <typename Base>
+class SkCanvasVirtualEnforcer : public Base {
+public:
+    using Base::Base;
+
+protected:
+    void onDrawPaint(const SkPaint& paint) override = 0;
+    void onDrawRect(const SkRect& rect, const SkPaint& paint) override = 0;
+    void onDrawRRect(const SkRRect& rrect, const SkPaint& paint) override = 0;
+    void onDrawDRRect(const SkRRect& outer, const SkRRect& inner,
+                      const SkPaint& paint) override = 0;
+    void onDrawOval(const SkRect& rect, const SkPaint& paint) override = 0;
+    void onDrawArc(const SkRect& rect, SkScalar startAngle, SkScalar sweepAngle, bool useCenter,
+                   const SkPaint& paint) override = 0;
+    void onDrawPath(const SkPath& path, const SkPaint& paint) override = 0;
+    void onDrawRegion(const SkRegion& region, const SkPaint& paint) override = 0;
+
+    void onDrawText(const void* text, size_t byteLength, SkScalar x, SkScalar y,
+                    const SkPaint& paint) override = 0;
+    void onDrawPosText(const void* text, size_t byteLength, const SkPoint pos[],
+                       const SkPaint& paint) override = 0;
+    void onDrawPosTextH(const void* text, size_t byteLength, const SkScalar xpos[],
+                        SkScalar constY, const SkPaint& paint) override = 0;
+    void onDrawTextOnPath(const void* text, size_t byteLength, const SkPath& path,
+                          const SkMatrix* matrix, const SkPaint& paint) override = 0;
+    void onDrawTextRSXform(const void* text, size_t byteLength, const SkRSXform xform[],
+                           const SkRect* cullRect, const SkPaint& paint) override = 0;
+    void onDrawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y,
+                        const SkPaint& paint) override = 0;
+
+    void onDrawPatch(const SkPoint cubics[12], const SkColor colors[4],
+                     const SkPoint texCoords[4], SkBlendMode mode,
+                     const SkPaint& paint) override = 0;
+    void onDrawPoints(SkCanvas::PointMode mode, size_t count, const SkPoint pts[],
+                      const SkPaint& paint) override = 0;
+    void onDrawVerticesObject(const SkVertices* vertices, SkBlendMode mode,
+                              const SkPaint& paint) override = 0;
+
+    void onDrawImage(const SkImage* image, SkScalar dx, SkScalar dy,
+                     const SkPaint* paint) override = 0;
+    void onDrawImageRect(const SkImage* image, const SkRect* src, const SkRect& dst,
+                         const SkPaint* paint, SkCanvas::SrcRectConstraint constraint) override = 0;
+    void onDrawImageNine(const SkImage* image, const SkIRect& center, const SkRect& dst,
+                         const SkPaint* paint) override = 0;
+    void onDrawImageLattice(const SkImage* image, const SkCanvas::Lattice& lattice,
+                            const SkRect& dst, const SkPaint* paint) override = 0;
+
+    void onDrawBitmap(const SkBitmap& bitmap, SkScalar dx, SkScalar dy,
+                      const SkPaint* paint) override = 0;
+    void onDrawBitmapRect(const SkBitmap& bitmap, const SkRect* src, const SkRect& dst,
+                          const SkPaint* paint,
+                          SkCanvas::SrcRectConstraint constraint) override = 0;
+    void onDrawBitmapNine(const SkBitmap& bitmap, const SkIRect& center, const SkRect& dst,
+                          const SkPaint* paint) override = 0;
+    void onDrawBitmapLattice(const SkBitmap& bitmap, const SkCanvas::Lattice& lattice,
+                             const SkRect& dst, const SkPaint* paint) override = 0;
+
+    void onDrawAtlas(const SkImage* atlas, const SkRSXform xform[], const SkRect rect[],
+                     const SkColor colors[], int count, SkBlendMode mode, const SkRect* cull,
+                     const SkPaint* paint) override = 0;
+
+    void onDrawAnnotation(const SkRect& rect, const char key[], SkData* value) override = 0;
+    void onDrawShadowRec(const SkPath&, const SkDrawShadowRec&) override = 0;
+
+    void onDrawDrawable(SkDrawable* drawable, const SkMatrix* matrix) override = 0;
+    void onDrawPicture(const SkPicture* picture, const SkMatrix* matrix,
+                       const SkPaint* paint) override = 0;
+};
+
+#endif