Revert of Revert of Revert "De-virtualize SkCanvas save/restore." (https://codereview.chromium.org/196323003/)

Reason for revert:
Pulling out to rename the virtuals.

Original issue's description:
> Revert of Revert "De-virtualize SkCanvas save/restore." (https://codereview.chromium.org/194923008/)
>
> Reason for revert:
> Re-landing after roll fix.
>
> Original issue's description:
> > Revert "De-virtualize SkCanvas save/restore."
> >
> > (To allow a roll fix into the tree).
> >
> > This reverts commit edf702204be42c945254191f9f9cd6585b3d189b.
> >
> > R=halcanary@google.com
> >
> > Committed: https://code.google.com/p/skia/source/detail?r=13748
>
> TBR=halcanary@google.com,fmalita@chromium.org
> NOTREECHECKS=true
> NOTRY=true
>
> Committed: http://code.google.com/p/skia/source/detail?r=13754

R=halcanary@google.com, fmalita@chromium.org
TBR=fmalita@chromium.org, halcanary@google.com
NOTREECHECKS=true
NOTRY=true

Author: fmalita@google.com

Review URL: https://codereview.chromium.org/197553002

git-svn-id: http://skia.googlecode.com/svn/trunk@13765 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/utils/SkDeferredCanvas.cpp b/src/utils/SkDeferredCanvas.cpp
index 8b617b3..efe7501 100644
--- a/src/utils/SkDeferredCanvas.cpp
+++ b/src/utils/SkDeferredCanvas.cpp
@@ -739,25 +739,28 @@
         SkIntToScalar(canvasSize.fWidth), SkIntToScalar(canvasSize.fHeight)));
 }
 
-void SkDeferredCanvas::onSave(SaveFlags flags) {
+int SkDeferredCanvas::save(SaveFlags flags) {
     this->drawingCanvas()->save(flags);
+    int val = this->INHERITED::save(flags);
     this->recordedDrawCommand();
-    this->INHERITED::onSave(flags);
+
+    return val;
 }
 
-bool SkDeferredCanvas::onSaveLayer(const SkRect* bounds, const SkPaint* paint,
-                                   SaveFlags flags) {
+int SkDeferredCanvas::saveLayer(const SkRect* bounds, const SkPaint* paint,
+                                SaveFlags flags) {
     this->drawingCanvas()->saveLayer(bounds, paint, flags);
+    int count = this->INHERITED::save(flags);
+    this->clipRectBounds(bounds, flags, NULL);
     this->recordedDrawCommand();
-    this->INHERITED::onSaveLayer(bounds, paint, flags);
-    // No need for a full layer.
-    return false;
+
+    return count;
 }
 
-void SkDeferredCanvas::onRestore() {
+void SkDeferredCanvas::restore() {
     this->drawingCanvas()->restore();
+    this->INHERITED::restore();
     this->recordedDrawCommand();
-    this->INHERITED::onRestore();
 }
 
 bool SkDeferredCanvas::isDrawingToLayer() const {
diff --git a/src/utils/SkDumpCanvas.cpp b/src/utils/SkDumpCanvas.cpp
index ccc5124..4805d62 100644
--- a/src/utils/SkDumpCanvas.cpp
+++ b/src/utils/SkDumpCanvas.cpp
@@ -192,13 +192,13 @@
 
 ///////////////////////////////////////////////////////////////////////////////
 
-void SkDumpCanvas::onSave(SaveFlags flags) {
+int SkDumpCanvas::save(SaveFlags flags) {
     this->dump(kSave_Verb, NULL, "save(0x%X)", flags);
-    this->INHERITED::onSave(flags);
+    return this->INHERITED::save(flags);
 }
 
-bool SkDumpCanvas::onSaveLayer(const SkRect* bounds, const SkPaint* paint,
-                               SaveFlags flags) {
+int SkDumpCanvas::saveLayer(const SkRect* bounds, const SkPaint* paint,
+                             SaveFlags flags) {
     SkString str;
     str.printf("saveLayer(0x%X)", flags);
     if (bounds) {
@@ -214,12 +214,12 @@
         }
     }
     this->dump(kSave_Verb, paint, str.c_str());
-    return this->INHERITED::onSaveLayer(bounds, paint, flags);
+    return this->INHERITED::saveLayer(bounds, paint, flags);
 }
 
-void SkDumpCanvas::onRestore() {
+void SkDumpCanvas::restore() {
+    this->INHERITED::restore();
     this->dump(kRestore_Verb, NULL, "restore");
-    this->INHERITED::onRestore();
 }
 
 bool SkDumpCanvas::translate(SkScalar dx, SkScalar dy) {
diff --git a/src/utils/SkLuaCanvas.cpp b/src/utils/SkLuaCanvas.cpp
index 2679fd2..0f13073 100644
--- a/src/utils/SkLuaCanvas.cpp
+++ b/src/utils/SkLuaCanvas.cpp
@@ -81,13 +81,13 @@
 
 SkLuaCanvas::~SkLuaCanvas() {}
 
-void SkLuaCanvas::onSave(SaveFlags flags) {
+int SkLuaCanvas::save(SaveFlags flags) {
     AUTO_LUA("save");
-    this->INHERITED::onSave(flags);
+    return this->INHERITED::save(flags);
 }
 
-bool SkLuaCanvas::onSaveLayer(const SkRect* bounds, const SkPaint* paint,
-                              SaveFlags flags) {
+int SkLuaCanvas::saveLayer(const SkRect* bounds, const SkPaint* paint,
+                             SaveFlags flags) {
     AUTO_LUA("saveLayer");
     if (bounds) {
         lua.pushRect(*bounds, "bounds");
@@ -95,15 +95,12 @@
     if (paint) {
         lua.pushPaint(*paint, "paint");
     }
-
-    this->INHERITED::onSaveLayer(bounds, paint, flags);
-    // No need for a layer.
-    return false;
+    return this->INHERITED::save(flags);
 }
 
-void SkLuaCanvas::onRestore() {
+void SkLuaCanvas::restore() {
     AUTO_LUA("restore");
-    this->INHERITED::onRestore();
+    this->INHERITED::restore();
 }
 
 bool SkLuaCanvas::translate(SkScalar dx, SkScalar dy) {
diff --git a/src/utils/SkNWayCanvas.cpp b/src/utils/SkNWayCanvas.cpp
index 6fbec96..a9543f9 100644
--- a/src/utils/SkNWayCanvas.cpp
+++ b/src/utils/SkNWayCanvas.cpp
@@ -57,33 +57,29 @@
     SkCanvas* fCanvas;
 };
 
-void SkNWayCanvas::onSave(SaveFlags flags) {
+int SkNWayCanvas::save(SaveFlags flags) {
     Iter iter(fList);
     while (iter.next()) {
         iter->save(flags);
     }
-
-    this->INHERITED::onSave(flags);
+    return this->INHERITED::save(flags);
 }
 
-bool SkNWayCanvas::onSaveLayer(const SkRect* bounds, const SkPaint* paint,
-                               SaveFlags flags) {
+int SkNWayCanvas::saveLayer(const SkRect* bounds, const SkPaint* paint,
+                                    SaveFlags flags) {
     Iter iter(fList);
     while (iter.next()) {
         iter->saveLayer(bounds, paint, flags);
     }
-
-    this->INHERITED::onSaveLayer(bounds, paint, flags);
-    // No need for a layer.
-    return false;
+    return this->INHERITED::saveLayer(bounds, paint, flags);
 }
 
-void SkNWayCanvas::onRestore() {
+void SkNWayCanvas::restore() {
     Iter iter(fList);
     while (iter.next()) {
         iter->restore();
     }
-    this->INHERITED::onRestore();
+    this->INHERITED::restore();
 }
 
 bool SkNWayCanvas::translate(SkScalar dx, SkScalar dy) {
diff --git a/src/utils/SkNoSaveLayerCanvas.h b/src/utils/SkNoSaveLayerCanvas.h
index 037fcec..60fad87 100644
--- a/src/utils/SkNoSaveLayerCanvas.h
+++ b/src/utils/SkNoSaveLayerCanvas.h
@@ -18,13 +18,21 @@
 public:
     SkNoSaveLayerCanvas(SkBaseDevice* device) : INHERITED(device) {}
 
-protected:
-    virtual bool onSaveLayer(const SkRect* bounds, const SkPaint* paint, SaveFlags flags)
-        SK_OVERRIDE {
-        this->INHERITED::onSaveLayer(bounds, paint, flags);
-        return false;
+    // 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;
     }
 
+protected:
     // disable aa for speed
     virtual void onClipRect(const SkRect& rect, SkRegion::Op op, ClipEdgeStyle) SK_OVERRIDE {
         this->INHERITED::onClipRect(rect, op, kHard_ClipEdgeStyle);
diff --git a/src/utils/SkProxyCanvas.cpp b/src/utils/SkProxyCanvas.cpp
index f61a31d..0a9d7a8 100644
--- a/src/utils/SkProxyCanvas.cpp
+++ b/src/utils/SkProxyCanvas.cpp
@@ -21,22 +21,17 @@
 
 ///////////////////////////////// Overrides ///////////
 
-void SkProxyCanvas::onSave(SaveFlags flags) {
-    fProxy->save(flags);
-    this->INHERITED::onSave(flags);
+int SkProxyCanvas::save(SaveFlags flags) {
+    return fProxy->save(flags);
 }
 
-bool SkProxyCanvas::onSaveLayer(const SkRect* bounds, const SkPaint* paint,
-                                SaveFlags flags) {
-    fProxy->saveLayer(bounds, paint, flags);
-    this->INHERITED::onSaveLayer(bounds, paint, flags);
-    // No need for a layer.
-    return false;
+int SkProxyCanvas::saveLayer(const SkRect* bounds, const SkPaint* paint,
+                             SaveFlags flags) {
+    return fProxy->saveLayer(bounds, paint, flags);
 }
 
-void SkProxyCanvas::onRestore() {
+void SkProxyCanvas::restore() {
     fProxy->restore();
-    this->INHERITED::onRestore();
 }
 
 bool SkProxyCanvas::translate(SkScalar dx, SkScalar dy) {
diff --git a/src/utils/debugger/SkDebugCanvas.cpp b/src/utils/debugger/SkDebugCanvas.cpp
index 67ecc65..08e6d94 100644
--- a/src/utils/debugger/SkDebugCanvas.cpp
+++ b/src/utils/debugger/SkDebugCanvas.cpp
@@ -530,9 +530,8 @@
     this->addDrawCommand(new SkPopCullCommand());
 }
 
-void SkDebugCanvas::onRestore() {
-    this->addDrawCommand(new SkRestoreCommand());
-    this->INHERITED::onRestore();
+void SkDebugCanvas::restore() {
+    addDrawCommand(new SkRestoreCommand());
 }
 
 bool SkDebugCanvas::rotate(SkScalar degrees) {
@@ -540,17 +539,15 @@
     return true;
 }
 
-void SkDebugCanvas::onSave(SaveFlags flags) {
-    this->addDrawCommand(new SkSaveCommand(flags));
-    this->INHERITED::onSave(flags);
+int SkDebugCanvas::save(SaveFlags flags) {
+    addDrawCommand(new SkSaveCommand(flags));
+    return true;
 }
 
-bool SkDebugCanvas::onSaveLayer(const SkRect* bounds, const SkPaint* paint,
-                                SaveFlags flags) {
-    this->addDrawCommand(new SkSaveLayerCommand(bounds, paint, flags));
-    this->INHERITED::onSaveLayer(bounds, paint, flags);
-    // No need for a full layer.
-    return false;
+int SkDebugCanvas::saveLayer(const SkRect* bounds, const SkPaint* paint,
+        SaveFlags flags) {
+    addDrawCommand(new SkSaveLayerCommand(bounds, paint, flags));
+    return true;
 }
 
 bool SkDebugCanvas::scale(SkScalar sx, SkScalar sy) {
diff --git a/src/utils/debugger/SkDebugCanvas.h b/src/utils/debugger/SkDebugCanvas.h
index 24824c9..0bbb640 100644
--- a/src/utils/debugger/SkDebugCanvas.h
+++ b/src/utils/debugger/SkDebugCanvas.h
@@ -206,8 +206,14 @@
                               const uint16_t indices[], int indexCount,
                               const SkPaint&) SK_OVERRIDE;
 
+    virtual void restore() SK_OVERRIDE;
+
     virtual bool rotate(SkScalar degrees) SK_OVERRIDE;
 
+    virtual int save(SaveFlags) SK_OVERRIDE;
+
+    virtual int saveLayer(const SkRect* bounds, const SkPaint*, SaveFlags) SK_OVERRIDE;
+
     virtual bool scale(SkScalar sx, SkScalar sy) SK_OVERRIDE;
 
     virtual void setMatrix(const SkMatrix& matrix) SK_OVERRIDE;
@@ -242,10 +248,6 @@
     }
 
 protected:
-    virtual void onSave(SaveFlags) SK_OVERRIDE;
-    virtual bool onSaveLayer(const SkRect*, const SkPaint*, SaveFlags) SK_OVERRIDE;
-    virtual void onRestore() SK_OVERRIDE;
-
     virtual void onDrawDRRect(const SkRRect&, const SkRRect&, const SkPaint&) SK_OVERRIDE;
     virtual void onPushCull(const SkRect& cullRect) SK_OVERRIDE;
     virtual void onPopCull() SK_OVERRIDE;