Add a paint filter utility canvas (SkPaintFilterCanvas)

src/utils/SkPaintFilterCanvas.cpp

Index: src/utils/SkPaintFilterCanvas.cpp
diff --git a/src/utils/SkPaintFilterCanvas.cpp b/src/utils/SkPaintFilterCanvas.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..1abebef8cad5e517da186c9dc945d7ed22a15a3f
--- /dev/null
+++ b/src/utils/SkPaintFilterCanvas.cpp
@@ -0,0 +1,157 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkPaintFilterCanvas.h"
+
+#include "SkPaint.h"
+#include "SkTLazy.h"
+
+class SkPaintFilterCanvas::AutoPaintFilter {
+public:
+    AutoPaintFilter(const SkPaintFilterCanvas* canvas, Type type, const SkPaint* paint) {
+        if (paint) {
+            canvas->onFilterPaint(fLazyPaint.set(*paint), type);
+        }
+    }
+
+    AutoPaintFilter(const SkPaintFilterCanvas* canvas, Type type, const SkPaint& paint) {
+        canvas->onFilterPaint(fLazyPaint.set(paint), type);
+    }
+
+    const SkPaint* paint() const { return fLazyPaint.getMaybeNull(); }
+
+private:
+    SkTLazy<SkPaint> fLazyPaint;
+};
+
+SkPaintFilterCanvas::SkPaintFilterCanvas(int width, int height) : INHERITED(width, height) { }
+
+void SkPaintFilterCanvas::onDrawPaint(const SkPaint& paint) {
+    AutoPaintFilter apf(this, kPaint_Type, paint);
+    this->INHERITED::onDrawPaint(*apf.paint());
+}
+
+void SkPaintFilterCanvas::onDrawPoints(PointMode mode, size_t count, const SkPoint pts[],
+                                       const SkPaint& paint) {
+    AutoPaintFilter apf(this, kPoint_Type, paint);
+    this->INHERITED::onDrawPoints(mode, count, pts, *apf.paint());
+}
+
+void SkPaintFilterCanvas::onDrawRect(const SkRect& rect, const SkPaint& paint) {
+    AutoPaintFilter apf(this, kRect_Type, paint);
+    this->INHERITED::onDrawRect(rect, *apf.paint());
+}
+
+void SkPaintFilterCanvas::onDrawRRect(const SkRRect& rrect, const SkPaint& paint) {
+    AutoPaintFilter apf(this, kRRect_Type, paint);
+    this->INHERITED::onDrawRRect(rrect, *apf.paint());
+}
+
+void SkPaintFilterCanvas::onDrawDRRect(const SkRRect& outer, const SkRRect& inner,
+                                       const SkPaint& paint) {
+    AutoPaintFilter apf(this, kDRRect_Type, paint);
+    this->INHERITED::onDrawDRRect(outer, inner, *apf.paint());
+}
+
+void SkPaintFilterCanvas::onDrawOval(const SkRect& rect, const SkPaint& paint) {
+    AutoPaintFilter apf(this, kOval_Type, paint);
+    this->INHERITED::onDrawOval(rect, *apf.paint());
+}
+
+void SkPaintFilterCanvas::onDrawPath(const SkPath& path, const SkPaint& paint) {
+    AutoPaintFilter apf(this, kPath_Type, paint);
+    this->INHERITED::onDrawPath(path, *apf.paint());
+}
+
+void SkPaintFilterCanvas::onDrawBitmap(const SkBitmap& bm, SkScalar left, SkScalar top,
+                                       const SkPaint* paint) {
+    AutoPaintFilter apf(this, kBitmap_Type, paint);
+    this->INHERITED::onDrawBitmap(bm, left, top, apf.paint());
+}
+
+void SkPaintFilterCanvas::onDrawBitmapRect(const SkBitmap& bm, const SkRect* src, const SkRect& dst,
+                                           const SkPaint* paint, DrawBitmapRectFlags flags) {
+    AutoPaintFilter apf(this, kBitmap_Type, paint);
+    this->INHERITED::onDrawBitmapRect(bm, src, dst, apf.paint(), flags);
+}
+
+void SkPaintFilterCanvas::onDrawImage(const SkImage* image, SkScalar left, SkScalar top,
+                                      const SkPaint* paint) {
+    AutoPaintFilter apf(this, kBitmap_Type, paint);
+    this->INHERITED::onDrawImage(image, left, top, apf.paint());
+}
+
+void SkPaintFilterCanvas::onDrawImageRect(const SkImage* image, const SkRect* src,
+                                          const SkRect& dst, const SkPaint* paint) {
+    AutoPaintFilter apf(this, kBitmap_Type, paint);
+    this->INHERITED::onDrawImageRect(image, src, dst, apf.paint());
+}
+
+void SkPaintFilterCanvas::onDrawBitmapNine(const SkBitmap& bm, const SkIRect& center,
+                                           const SkRect& dst, const SkPaint* paint) {
+    AutoPaintFilter apf(this, kBitmap_Type, paint);
+    this->INHERITED::onDrawBitmapNine(bm, center, dst, apf.paint());
+}
+
+void SkPaintFilterCanvas::onDrawSprite(const SkBitmap& bm, int left, int top,
+                                       const SkPaint* paint) {
+    AutoPaintFilter apf(this, kBitmap_Type, paint);
+    this->INHERITED::onDrawSprite(bm, left, top, apf.paint());
+}
+
+void SkPaintFilterCanvas::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) {
+    AutoPaintFilter apf(this, kVertices_Type, paint);
+    this->INHERITED::onDrawVertices(vmode, vertexCount, vertices, texs, colors, xmode, indices,
+                                    indexCount, *apf.paint());
+}
+
+void SkPaintFilterCanvas::onDrawPatch(const SkPoint cubics[], const SkColor colors[],
+                                      const SkPoint texCoords[], SkXfermode* xmode,
+                                      const SkPaint& paint) {
+    AutoPaintFilter apf(this, kPatch_Type, paint);
+    this->INHERITED::onDrawPatch(cubics, colors, texCoords, xmode, *apf.paint());
+}
+
+void SkPaintFilterCanvas::onDrawPicture(const SkPicture* picture, const SkMatrix* m,
+                                        const SkPaint* paint) {
+    AutoPaintFilter apf(this, kPicture_Type, paint);
+    this->INHERITED::onDrawPicture(picture, m, apf.paint());
+}
+
+void SkPaintFilterCanvas::onDrawText(const void* text, size_t byteLength, SkScalar x, SkScalar y,
+                                     const SkPaint& paint) {
+    AutoPaintFilter apf(this, kText_Type, paint);
+    this->INHERITED::onDrawText(text, byteLength, x, y, *apf.paint());
+}
+
+void SkPaintFilterCanvas::onDrawPosText(const void* text, size_t byteLength, const SkPoint pos[],
+                                        const SkPaint& paint) {
+    AutoPaintFilter apf(this, kText_Type, paint);
+    this->INHERITED::onDrawPosText(text, byteLength, pos, *apf.paint());
+}
+
+void SkPaintFilterCanvas::onDrawPosTextH(const void* text, size_t byteLength, const SkScalar xpos[],
+                                         SkScalar constY, const SkPaint& paint) {
+    AutoPaintFilter apf(this, kText_Type, paint);
+    this->INHERITED::onDrawPosTextH(text, byteLength, xpos, constY, *apf.paint());
+}
+
+void SkPaintFilterCanvas::onDrawTextOnPath(const void* text, size_t byteLength, const SkPath& path,
+                                           const SkMatrix* matrix, const SkPaint& paint) {
+    AutoPaintFilter apf(this, kText_Type, paint);
+    this->INHERITED::onDrawTextOnPath(text, byteLength, path, matrix, *apf.paint());
+}
+
+void SkPaintFilterCanvas::onDrawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y,
+                                         const SkPaint& paint) {
+    AutoPaintFilter apf(this, kTextBlob_Type, paint);
+    this->INHERITED::onDrawTextBlob(blob, x, y, *apf.paint());
+}