NoSaveLayerCanvas now its own file
https://codereview.chromium.org/120553003/
git-svn-id: http://skia.googlecode.com/svn/trunk@12938 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/utils/SkNoSaveLayerCanvas.h b/src/utils/SkNoSaveLayerCanvas.h
new file mode 100644
index 0000000..82ce82a
--- /dev/null
+++ b/src/utils/SkNoSaveLayerCanvas.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkNoSaveLayerCanvas_DEFINED
+#define SkNoSaveLayerCanvas_DEFINED
+
+#include "SkCanvas.h"
+#include "SkRRect.h"
+
+// The NoSaveLayerCanvas is used to play back SkPictures when the saveLayer
+// functionality isn't required (e.g., during analysis of the draw calls).
+// It also simplifies the clipping calls to only use rectangles.
+class SkNoSaveLayerCanvas : public SkCanvas {
+public:
+ SkNoSaveLayerCanvas(SkBaseDevice* device) : INHERITED(device) {}
+
+ // turn saveLayer() into save() for speed, should not affect correctness.
+ virtual int saveLayer(const SkRect* bounds,
+ const SkPaint* paint,
+ SaveFlags flags) SK_OVERRIDE {
+
+ // Like SkPictureRecord, we don't want to create layers, but we do need
+ // to respect the save and (possibly) its rect-clip.
+ int count = this->INHERITED::save(flags);
+ if (NULL != bounds) {
+ this->INHERITED::clipRectBounds(bounds, flags, NULL);
+ }
+ return count;
+ }
+
+ // disable aa for speed
+ virtual bool clipRect(const SkRect& rect,
+ SkRegion::Op op,
+ bool doAA) SK_OVERRIDE {
+ return this->INHERITED::clipRect(rect, op, false);
+ }
+
+ // for speed, just respect the bounds, and disable AA. May give us a few
+ // false positives and negatives.
+ virtual bool clipPath(const SkPath& path,
+ SkRegion::Op op,
+ bool doAA) SK_OVERRIDE {
+ return this->updateClipConservativelyUsingBounds(path.getBounds(), op,
+ path.isInverseFillType());
+ }
+ virtual bool clipRRect(const SkRRect& rrect,
+ SkRegion::Op op,
+ bool doAA) SK_OVERRIDE {
+ return this->updateClipConservativelyUsingBounds(rrect.getBounds(), op, false);
+ }
+
+private:
+ typedef SkCanvas INHERITED;
+};
+
+#endif // SkNoSaveLayerCanvas_DEFINED