Image Search: Move thumbnail JPEG encoding to the renderer.

chrome/renderer/chrome_render_frame_observer.cc

 // Copyright 2013 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 "chrome/renderer/chrome_render_frame_observer.h"
 
+#include <limits>
+#include <string>
+#include <vector>
+
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/common/prerender_messages.h"
 #include "chrome/common/print_messages.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/renderer/prerender/prerender_helper.h"
 #include "chrome/renderer/printing/print_web_view_helper.h"
 #include "content/public/renderer/render_frame.h"
 #include "skia/ext/image_operations.h"
-#include "skia/ext/platform_canvas.h"
 #include "third_party/WebKit/public/platform/WebImage.h"
 #include "third_party/WebKit/public/web/WebElement.h"
 #include "third_party/WebKit/public/web/WebNode.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+#include "ui/gfx/codec/jpeg_codec.h"
 
 using blink::WebElement;
 using blink::WebNode;
 
 namespace {
 
 // If the source image is null or occupies less area than
 // |thumbnail_min_area_pixels|, we return the image unmodified.  Otherwise, we
 // scale down the image so that the width and height do not exceed
 // |thumbnail_max_size_pixels|, preserving the original aspect ratio.
@@ skipping 81 matching lines @@
   WebNode context_node = render_frame()->GetContextMenuNode();
   SkBitmap thumbnail;
   gfx::Size original_size;
   if (!context_node.isNull() && context_node.isElementNode()) {
     blink::WebImage image = context_node.to<WebElement>().imageContents();
     original_size = image.size();
     thumbnail = Downscale(image,
                           thumbnail_min_area_pixels,
                           thumbnail_max_size_pixels);
   }
+
+  SkBitmap bitmap;
+  if (thumbnail.colorType() == kN32_SkColorType)
+    bitmap = thumbnail;
+  else
+    thumbnail.copyTo(&bitmap, kN32_SkColorType);
+
+  std::string thumbnail_data;
+  SkAutoLockPixels lock(bitmap);
+  if (bitmap.getPixels()) {
+    const int kDefaultQuality = 90;
+    std::vector<unsigned char> data;
+    if (gfx::JPEGCodec::Encode(
+            reinterpret_cast<unsigned char*>(bitmap.getAddr32(0, 0)),
+            gfx::JPEGCodec::FORMAT_SkBitmap, bitmap.width(), bitmap.height(),
+            static_cast<int>(bitmap.rowBytes()), kDefaultQuality, &data))
+      thumbnail_data = std::string(data.begin(), data.end());
+  }
+
   Send(new ChromeViewHostMsg_RequestThumbnailForContextNode_ACK(
-      routing_id(), thumbnail, original_size));
+      routing_id(), thumbnail_data, original_size));
 }
 
 void ChromeRenderFrameObserver::OnPrintNodeUnderContextMenu() {
   printing::PrintWebViewHelper* helper =
       printing::PrintWebViewHelper::Get(render_frame()->GetRenderView());
   if (helper)
     helper->PrintNode(render_frame()->GetContextMenuNode());
 }