Implement convertToBlob() in OffscreenCanvas

third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 718 matching lines @@
                                                      BackBuffer)) {
     // copyRenderingResultsFromDrawingBuffer is expected to always succeed
     // because we've explicitly created an Accelerated surface and have already
     // validated it.
     NOTREACHED();
     return nullptr;
   }
   return buffer->newImageSnapshot(hint, reason);
 }
 
+ImageData* WebGLRenderingContextBase::toImageData(SnapshotReason reason) const {
+  // TODO: Furnish toImageData in webgl renderingcontext for jpeg and webp
+  // images. See crbug.com/657531.
+  ImageData* imageData = nullptr;
+  if (this->drawingBuffer()) {
+    sk_sp<SkImage> snapshot = this->drawingBuffer()
+                                  ->transferToStaticBitmapImage()
+                                  ->imageForCurrentFrame();
+    if (snapshot) {
+      imageData = ImageData::create(this->getOffscreenCanvas()->size());
+      SkImageInfo imageInfo = SkImageInfo::Make(
+          this->drawingBufferWidth(), this->drawingBufferHeight(),
+          kRGBA_8888_SkColorType, kUnpremul_SkAlphaType);
+      snapshot->readPixels(imageInfo, imageData->data()->data(),
+                           imageInfo.minRowBytes(), 0, 0);
+    }
+  }
+  return imageData;
+}
+
 namespace {
 
 // Exposed by GL_ANGLE_depth_texture
 static const GLenum kSupportedInternalFormatsOESDepthTex[] = {
     GL_DEPTH_COMPONENT, GL_DEPTH_STENCIL,
 };
 
 // Exposed by GL_EXT_sRGB
 static const GLenum kSupportedInternalFormatsEXTsRGB[] = {
     GL_SRGB, GL_SRGB_ALPHA_EXT,
@@ skipping 6782 matching lines @@
 
 void WebGLRenderingContextBase::getHTMLOrOffscreenCanvas(
     HTMLCanvasElementOrOffscreenCanvas& result) const {
   if (canvas())
     result.setHTMLCanvasElement(canvas());
   else
     result.setOffscreenCanvas(getOffscreenCanvas());
 }
 
 }  // namespace blink