Add utils/android/SkAndroidSDKCanvas

src/utils/android/SkAndroidSDKCanvas.h

+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkAndroidSDKCanvas_DEFINED
+#define SkAndroidSDKCanvas_DEFINED
+
+#include "SkBitmap.h"
+#include "SkCanvas.h"
+#include "SkPaint.h"
+#include "SkPath.h"
+#include "SkRect.h"
+
+/** SkDrawFilter is likely to be deprecated; this is a proxy
+    canvas that does the same thing: alter SkPaint fields.
+
+    onDraw*() functions may have their SkPaint modified, and are then
+    passed on to the same function on proxyTarget. THIS BREAKS CONSTNESS!
+
+    This still suffers one of the same architectural flaws as SkDrawFilter:
+    TextBlob paints are incomplete when filter is called.
+*/
+
+class SkAndroidSDKCanvas : public SkCanvas {
+public:
+    SkAndroidSDKCanvas();
+    void reset(SkCanvas* newTarget);
+
+protected:
+
+    // FILTERING
+
+    void onDrawPaint(const SkPaint& paint) SK_OVERRIDE;
+    void onDrawPoints(PointMode pMode, size_t count, const SkPoint pts[],
+                      const SkPaint& paint) SK_OVERRIDE;
+    void onDrawOval(const SkRect& r, const SkPaint& paint) SK_OVERRIDE;
+    void onDrawRect(const SkRect& r, const SkPaint& paint) SK_OVERRIDE;
+    void onDrawRRect(const SkRRect& r, const SkPaint& paint) SK_OVERRIDE;
+    void onDrawPath(const SkPath& path, const SkPaint& paint) SK_OVERRIDE;
+    void onDrawBitmap(const SkBitmap& bitmap, SkScalar left, SkScalar top,
+                      const SkPaint* paint) SK_OVERRIDE;
+    void onDrawBitmapRect(const SkBitmap& bitmap, const SkRect* src, const SkRect& dst,
+                          const SkPaint* paint, DrawBitmapRectFlags flags) SK_OVERRIDE;
+    void onDrawBitmapNine(const SkBitmap& bitmap, const SkIRect& center,
+                          const SkRect& dst, const SkPaint* paint) SK_OVERRIDE;
+    void onDrawSprite(const SkBitmap& bitmap, int left, int top,
+                      const SkPaint* paint) SK_OVERRIDE;
+    void onDrawVertices(VertexMode vMode, int vertexCount, const SkPoint vertices[],
+                        const SkPoint texs[], const SkColor colors[], SkXfermode* xMode,
+                        const uint16_t indices[], int indexCount,
+                        const SkPaint& paint) SK_OVERRIDE;
+
+    void onDrawDRRect(const SkRRect& outer, const SkRRect& inner,
+                      const SkPaint& paint) SK_OVERRIDE;
+
+    void onDrawText(const void* text, size_t byteLength, SkScalar x, SkScalar y,
+                    const SkPaint& paint) SK_OVERRIDE;
+    void onDrawPosText(const void* text, size_t byteLength, const SkPoint pos[],
+                       const SkPaint& paint) SK_OVERRIDE;
+    void onDrawPosTextH(const void* text, size_t byteLength, const SkScalar xpos[],
+                        SkScalar constY, const SkPaint& paint) SK_OVERRIDE;
+    void onDrawTextOnPath(const void* text, size_t byteLength, const SkPath& path,
+                          const SkMatrix* matrix, const SkPaint& paint) SK_OVERRIDE;
+    void onDrawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y,
+                        const SkPaint& paint) SK_OVERRIDE;
+
+    void onDrawPatch(const SkPoint cubics[12], const SkColor colors[4],
+                     const SkPoint texCoords[4], SkXfermode* xmode,
+                     const SkPaint& paint) SK_OVERRIDE;
+
+    void onDrawImage(const SkImage*, SkScalar, SkScalar, const SkPaint*) SK_OVERRIDE;
+    void onDrawImageRect(const SkImage*, const SkRect*, const SkRect&, const SkPaint*)
+        SK_OVERRIDE;
+    void onDrawPicture(const SkPicture*, const SkMatrix*, const SkPaint*);
+
+    // PASS THROUGH
+
+    void onDrawDrawable(SkDrawable*) SK_OVERRIDE;
+    SkISize getBaseLayerSize() const SK_OVERRIDE;
+    bool getClipBounds(SkRect*) const SK_OVERRIDE;
+    bool getClipDeviceBounds(SkIRect*) const SK_OVERRIDE;
+    bool isClipEmpty() const SK_OVERRIDE;
+    bool isClipRect() const SK_OVERRIDE;
+    SkSurface* onNewSurface(const SkImageInfo&, const SkSurfaceProps&) SK_OVERRIDE;
+    const void* onPeekPixels(SkImageInfo*, size_t*) SK_OVERRIDE;
+    void* onAccessTopLayerPixels(SkImageInfo*, size_t*) SK_OVERRIDE;
+    void willSave() SK_OVERRIDE;
+    void willRestore() SK_OVERRIDE;
+    void didRestore() SK_OVERRIDE;
+    void didConcat(const SkMatrix&) SK_OVERRIDE;
+    void didSetMatrix(const SkMatrix&) SK_OVERRIDE;
+    void onClipRect(const SkRect&, SkRegion::Op, ClipEdgeStyle) SK_OVERRIDE;
+    void onClipRRect(const SkRRect&, SkRegion::Op, ClipEdgeStyle) SK_OVERRIDE;
+    void onClipPath(const SkPath&, SkRegion::Op, ClipEdgeStyle) SK_OVERRIDE;
+    void onClipRegion(const SkRegion&, SkRegion::Op) SK_OVERRIDE;
+    void onDiscard() SK_OVERRIDE;
+
+protected:
+    SkCanvas* fProxyTarget;
+};
+
+#endif  // SkAndroidSDKCanvas_DEFINED
+