Add drawRegion() API to SkCanvas

src/core/SkPictureRecord.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkPictureRecord.h"
 #include "SkImage_Base.h"
 #include "SkPatchUtils.h"
@@ skipping 433 matching lines @@
 
 void SkPictureRecord::onDrawRect(const SkRect& rect, const SkPaint& paint) {
     // op + paint index + rect
     size_t size = 2 * kUInt32Size + sizeof(rect);
     size_t initialOffset = this->addDraw(DRAW_RECT, &size);
     this->addPaint(paint);
     this->addRect(rect);
     this->validate(initialOffset, size);
 }
 
+void SkPictureRecord::onDrawRegion(const SkRegion& region, const SkPaint& paint) {
+    // op + paint index + region
+    size_t regionBytes = region.writeToMemory(nullptr);
+    size_t size = 2 * kUInt32Size + regionBytes;
+    size_t initialOffset = this->addDraw(DRAW_REGION, &size);
+    this->addPaint(paint);
+    fWriter.writeRegion(region);
+    this->validate(initialOffset, size);
+}
+
 void SkPictureRecord::onDrawRRect(const SkRRect& rrect, const SkPaint& paint) {
     // op + paint index + rrect
     size_t size = 2 * kUInt32Size + SkRRect::kSizeInMemory;
     size_t initialOffset = this->addDraw(DRAW_RRECT, &size);
     this->addPaint(paint);
     this->addRRect(rrect);
     this->validate(initialOffset, size);
 }
 
 void SkPictureRecord::onDrawDRRect(const SkRRect& outer, const SkRRect& inner,
@@ skipping 508 matching lines @@
 
 void SkPictureRecord::addTextBlob(const SkTextBlob *blob) {
     int index = fTextBlobRefs.count();
     *fTextBlobRefs.append() = blob;
     blob->ref();
     // follow the convention of recording a 1-based index
     this->addInt(index + 1);
 }
 
 ///////////////////////////////////////////////////////////////////////////////