Replace image_messages.h with Mojo service

content/renderer/image_downloader/image_downloader_impl.cc

-// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Copyright 2015 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 "content/renderer/image_loading_helper.h"
+#include "content/renderer/image_downloader/image_downloader_impl.h"
 
 #include "base/bind.h"
+#include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "content/child/image_decoder.h"
-#include "content/common/image_messages.h"
 #include "content/public/renderer/render_frame.h"
 #include "content/renderer/fetchers/multi_resolution_image_resource_fetcher.h"
+#include "mojo/common/url_type_converters.h"
+#include "mojo/converters/geometry/geometry_type_converters.h"
 #include "net/base/data_url.h"
 #include "skia/ext/image_operations.h"
+#include "skia/public/type_converters.h"
 #include "third_party/WebKit/public/platform/WebURLRequest.h"
 #include "third_party/WebKit/public/platform/WebVector.h"
 #include "third_party/WebKit/public/web/WebLocalFrame.h"
 #include "third_party/WebKit/public/web/WebView.h"
 #include "ui/gfx/favicon_size.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/gfx/skbitmap_operations.h"
 #include "url/url_constants.h"
 
 using blink::WebFrame;
 using blink::WebVector;
 using blink::WebURL;
 using blink::WebURLRequest;
 
 namespace {
 
+// Decodes a data: URL image or returns an empty image in case of failure.
+SkBitmap ImageFromDataUrl(const GURL& url) {
+  std::string mime_type, char_set, data;
+  if (net::DataURL::Parse(url, &mime_type, &char_set, &data) && !data.empty()) {
+    // Decode the image using WebKit's image decoder.
+    content::ImageDecoder decoder(
+        gfx::Size(gfx::kFaviconSize, gfx::kFaviconSize));
+    const unsigned char* src_data =
+        reinterpret_cast<const unsigned char*>(data.data());
+
+    return decoder.Decode(src_data, data.size());
+  }
+  return SkBitmap();
+}
+
 //  Proportionally resizes the |image| to fit in a box of size
 // |max_image_size|.
 SkBitmap ResizeImage(const SkBitmap& image, uint32_t max_image_size) {
   if (max_image_size == 0)
     return image;
   uint32_t max_dimension = std::max(image.width(), image.height());
   if (max_dimension <= max_image_size)
     return image;
   // Proportionally resize the minimal image to fit in a box of size
   // max_image_size.
   return skia::ImageOperations::Resize(
-      image,
-      skia::ImageOperations::RESIZE_BEST,
+      image, skia::ImageOperations::RESIZE_BEST,
       static_cast<uint64_t>(image.width()) * max_image_size / max_dimension,
       static_cast<uint64_t>(image.height()) * max_image_size / max_dimension);
 }
 
 // Filters the array of bitmaps, removing all images that do not fit in a box of
 // size |max_image_size|. Returns the result if it is not empty. Otherwise,
 // find the smallest image in the array and resize it proportionally to fit
 // in a box of size |max_image_size|.
 // Sets |original_image_sizes| to the sizes of |images| before resizing.
 void FilterAndResizeImagesForMaximalSize(
     const std::vector<SkBitmap>& unfiltered,
     uint32_t max_image_size,
     std::vector<SkBitmap>* images,
     std::vector<gfx::Size>* original_image_sizes) {
   images->clear();
   original_image_sizes->clear();
 
   if (!unfiltered.size())
     return;
 
   if (max_image_size == 0)
     max_image_size = std::numeric_limits<uint32_t>::max();
 
   const SkBitmap* min_image = NULL;
   uint32_t min_image_size = std::numeric_limits<uint32_t>::max();
   // Filter the images by |max_image_size|, and also identify the smallest image
   // in case all the images are bigger than |max_image_size|.
   for (std::vector<SkBitmap>::const_iterator it = unfiltered.begin();
-       it != unfiltered.end();
-       ++it) {
+       it != unfiltered.end(); ++it) {
     const SkBitmap& image = *it;
     uint32_t current_size = std::max(it->width(), it->height());
     if (current_size < min_image_size) {
       min_image = &image;
       min_image_size = current_size;
     }
     if (static_cast<uint32_t>(image.width()) <= max_image_size &&
         static_cast<uint32_t>(image.height()) <= max_image_size) {
       images->push_back(image);
       original_image_sizes->push_back(gfx::Size(image.width(), image.height()));
     }
   }
   DCHECK(min_image);
   if (images->size())
     return;
   // Proportionally resize the minimal image to fit in a box of size
   // |max_image_size|.
   images->push_back(ResizeImage(*min_image, max_image_size));
   original_image_sizes->push_back(
       gfx::Size(min_image->width(), min_image->height()));
 }
 
 }  // namespace
 
 namespace content {
 
-ImageLoadingHelper::ImageLoadingHelper(RenderFrame* render_frame)
-    : RenderFrameObserver(render_frame) {
+ImageDownloaderImpl::ImageDownloaderImpl(
+    RenderFrame* render_frame,
+    mojo::InterfaceRequest<image_downloader::ImageDownloader> request)
+    : RenderFrameObserver(render_frame), binding_(this, request.Pass()) {
+  DCHECK(render_frame);
 }
 
-ImageLoadingHelper::~ImageLoadingHelper() {
+ImageDownloaderImpl::~ImageDownloaderImpl() {
 }
 
-void ImageLoadingHelper::OnDownloadImage(
-    int id,
-    const GURL& image_url,
-    bool is_favicon,
-    uint32_t max_image_size,
-    bool bypass_cache) {
+// static
+void ImageDownloaderImpl::CreateMojoService(
+    RenderFrame* render_frame,
+    mojo::InterfaceRequest<image_downloader::ImageDownloader> request) {
+  DVLOG(1) << "ImageDownloaderImpl::CreateService";
+  DCHECK(render_frame);
+
+  new ImageDownloaderImpl(render_frame, request.Pass());
+}
+
+// ImageDownloader methods:
+void ImageDownloaderImpl::DownloadImage(
+    image_downloader::DownloadRequestPtr req,
+    const DownloadImageCallback& callback) {
+  const GURL image_url = req->url.To<GURL>();
+  bool is_favicon = req->is_favicon;
+  uint32_t max_image_size = req->max_bitmap_size;
+  bool bypass_cache = req->bypass_cache;
+
   std::vector<SkBitmap> result_images;
   std::vector<gfx::Size> result_original_image_sizes;
+
   if (image_url.SchemeIs(url::kDataScheme)) {
     SkBitmap data_image = ImageFromDataUrl(image_url);
     if (!data_image.empty()) {
       result_images.push_back(ResizeImage(data_image, max_image_size));
       result_original_image_sizes.push_back(
           gfx::Size(data_image.width(), data_image.height()));
     }
   } else {
-    if (DownloadImage(id, image_url, is_favicon, max_image_size,
-                      bypass_cache)) {
-      // Will complete asynchronously via ImageLoadingHelper::DidDownloadImage
+    if (FetchImage(image_url, is_favicon, max_image_size, bypass_cache,
+                   callback)) {
+      // Will complete asynchronously via ImageDownloaderImpl::DidFetchImage
       return;
     }
   }
 
-  Send(new ImageHostMsg_DidDownloadImage(routing_id(),
-                                         id,
-                                         0,
-                                         image_url,
-                                         result_images,
-                                         result_original_image_sizes));
+  ReplyDownloadResult(0, result_images, result_original_image_sizes, callback);
 }
 
-bool ImageLoadingHelper::DownloadImage(
-    int id,
-    const GURL& image_url,
-    bool is_favicon,
-    uint32_t max_image_size,
-    bool bypass_cache) {
+bool ImageDownloaderImpl::FetchImage(const GURL& image_url,
+                                     bool is_favicon,
+                                     uint32_t max_image_size,
+                                     bool bypass_cache,
+                                     const DownloadImageCallback& callback) {
+  blink::WebLocalFrame* frame = render_frame()->GetWebFrame();
+  if (!frame)
+    return false;
+
   // Create an image resource fetcher and assign it with a call back object.
   image_fetchers_.push_back(new MultiResolutionImageResourceFetcher(
-      image_url, render_frame()->GetWebFrame(), id,
-      is_favicon ? WebURLRequest::RequestContextFavicon
-                 : WebURLRequest::RequestContextImage,
+      image_url, frame, 0, is_favicon ? WebURLRequest::RequestContextFavicon
+                                      : WebURLRequest::RequestContextImage,
       bypass_cache ? WebURLRequest::ReloadBypassingCache
                    : WebURLRequest::UseProtocolCachePolicy,
-      base::Bind(&ImageLoadingHelper::DidDownloadImage, base::Unretained(this),
-                 max_image_size)));
+      base::Bind(&ImageDownloaderImpl::DidFetchImage, base::Unretained(this),
+                 max_image_size, callback)));
   return true;
 }
 
-void ImageLoadingHelper::DidDownloadImage(
+void ImageDownloaderImpl::DidFetchImage(
     uint32_t max_image_size,
+    const DownloadImageCallback& callback,
     MultiResolutionImageResourceFetcher* fetcher,
     const std::vector<SkBitmap>& images) {
   std::vector<SkBitmap> result_images;
   std::vector<gfx::Size> result_original_image_sizes;
   FilterAndResizeImagesForMaximalSize(images, max_image_size, &result_images,
-      &result_original_image_sizes);
+                                      &result_original_image_sizes);
 
-  // Notify requester of image download status.
-  Send(new ImageHostMsg_DidDownloadImage(
-      routing_id(),
-      fetcher->id(),
-      fetcher->http_status_code(),
-      fetcher->image_url(),
-      result_images,
-      result_original_image_sizes));
+  ReplyDownloadResult(fetcher->http_status_code(), result_images,
+                      result_original_image_sizes, callback);
 
   // Remove the image fetcher from our pending list. We're in the callback from
   // MultiResolutionImageResourceFetcher, best to delay deletion.
   ImageResourceFetcherList::iterator iter =
       std::find(image_fetchers_.begin(), image_fetchers_.end(), fetcher);
   if (iter != image_fetchers_.end()) {
     image_fetchers_.weak_erase(iter);
     base::MessageLoop::current()->DeleteSoon(FROM_HERE, fetcher);
   }
 }
 
-SkBitmap ImageLoadingHelper::ImageFromDataUrl(const GURL& url) const {
-  std::string mime_type, char_set, data;
-  if (net::DataURL::Parse(url, &mime_type, &char_set, &data) && !data.empty()) {
-    // Decode the image using WebKit's image decoder.
-    ImageDecoder decoder(gfx::Size(gfx::kFaviconSize, gfx::kFaviconSize));
-    const unsigned char* src_data =
-        reinterpret_cast<const unsigned char*>(&data[0]);
+void ImageDownloaderImpl::ReplyDownloadResult(
+    int32_t http_status_code,
+    const std::vector<SkBitmap>& result_images,
+    const std::vector<gfx::Size>& result_original_image_sizes,
+    const DownloadImageCallback& callback) {
+  image_downloader::DownloadResultPtr result =
+      image_downloader::DownloadResult::New();
 
-    return decoder.Decode(src_data, data.size());
-  }
-  return SkBitmap();
-}
+  result->http_status_code = http_status_code;
+  result->images = mojo::Array<skia::BitmapPtr>::From(result_images);
+  result->original_image_sizes =
+      mojo::Array<mojo::SizePtr>::From(result_original_image_sizes);
 
-bool ImageLoadingHelper::OnMessageReceived(const IPC::Message& message) {
-  bool handled = true;
-  IPC_BEGIN_MESSAGE_MAP(ImageLoadingHelper, message)
-    IPC_MESSAGE_HANDLER(ImageMsg_DownloadImage, OnDownloadImage)
-    IPC_MESSAGE_UNHANDLED(handled = false)
-  IPC_END_MESSAGE_MAP()
-
-  return handled;
+  callback.Run(result.Pass());
 }
 
 }  // namespace content