Implement convertToBlob() in OffscreenCanvas

third_party/WebKit/Source/modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.h"
 
 #include "bindings/modules/v8/OffscreenCanvasRenderingContext2DOrWebGLRenderingContextOrWebGL2RenderingContext.h"
 #include "core/frame/ImageBitmap.h"
 #include "core/frame/Settings.h"
 #include "core/workers/WorkerGlobalScope.h"
@@ skipping 140 matching lines @@
     AccelerationHint hint,
     SnapshotReason reason) const {
   if (!imageBuffer())
     return nullptr;
   sk_sp<SkImage> skImage = m_imageBuffer->newSkImageSnapshot(hint, reason);
   RefPtr<StaticBitmapImage> image =
       StaticBitmapImage::create(std::move(skImage));
   return image;
 }
 
+ImageData* OffscreenCanvasRenderingContext2D::toImageData(
+    SnapshotReason reason) const {
+  if (!imageBuffer())
+    return nullptr;
+  sk_sp<SkImage> snapshot =
+      m_imageBuffer->newSkImageSnapshot(PreferNoAcceleration, reason);
+  ImageData* imageData = nullptr;
+  if (snapshot) {
+    imageData = ImageData::create(this->getOffscreenCanvas()->size());
+    SkImageInfo imageInfo =
+        SkImageInfo::Make(this->width(), this->height(), kRGBA_8888_SkColorType,
+                          kUnpremul_SkAlphaType);
+    snapshot->readPixels(imageInfo, imageData->data()->data(),
+                         imageInfo.minRowBytes(), 0, 0);
+  }
+  return imageData;
+}
+
 void OffscreenCanvasRenderingContext2D::setOffscreenCanvasGetContextResult(
     OffscreenRenderingContext& result) {
   result.setOffscreenCanvasRenderingContext2D(this);
 }
 
 bool OffscreenCanvasRenderingContext2D::parseColorOrCurrentColor(
     Color& color,
     const String& colorString) const {
   return ::blink::parseColorOrCurrentColor(color, colorString, nullptr);
 }
@@ skipping 46 matching lines @@
 }
 
 bool OffscreenCanvasRenderingContext2D::isContextLost() const {
   return false;
 }
 
 bool OffscreenCanvasRenderingContext2D::isPaintable() const {
   return this->imageBuffer();
 }
 }