chrome/renderer/plugins/plugin_preroller.cc

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/renderer/plugins/plugin_preroller.h"
   6
   7 #include "base/base64.h"
   8 #include "chrome/grit/renderer_resources.h"
   9 #include "chrome/renderer/plugins/chrome_plugin_placeholder.h"
  10 #include "third_party/WebKit/public/platform/WebRect.h"
  11 #include "third_party/WebKit/public/web/WebElement.h"
  12 #include "third_party/WebKit/public/web/WebPlugin.h"
  13 #include "third_party/WebKit/public/web/WebPluginContainer.h"
  14 #include "ui/gfx/codec/png_codec.h"
  15
  16 PluginPreroller::PluginPreroller(content::RenderFrame* render_frame,
  17                                  blink::WebLocalFrame* frame,
  18                                  const blink::WebPluginParams& params,
  19                                  const content::WebPluginInfo& info,
  20                                  const std::string& identifier,
  21                                  const base::string16& name,
  22                                  const base::string16& message,
  23                                  blink::WebPlugin* plugin,
  24                                  content::PluginInstanceThrottler* throttler)
  25     : RenderFrameObserver(render_frame),
  26       frame_(frame),
  27       params_(params),
  28       info_(info),
  29       identifier_(identifier),
  30       name_(name),
  31       message_(message),
  32       plugin_(plugin),
  33       throttler_(throttler) {
  34   DCHECK(plugin);
  35   DCHECK(throttler);
  36   throttler_->AddObserver(this);
  37 }
  38
  39 PluginPreroller::~PluginPreroller() {
  40   if (throttler_)
  41     throttler_->RemoveObserver(this);
  42 }
  43
  44 void PluginPreroller::OnKeyframeExtracted(const SkBitmap* bitmap) {
  45   std::vector<unsigned char> png_data;
  46   if (!gfx::PNGCodec::EncodeBGRASkBitmap(*bitmap, false, &png_data)) {
  47     DLOG(ERROR) << "Provided keyframe could not be encoded as PNG.";
  48     return;
  49   }
  50
  51   base::StringPiece png_as_string(reinterpret_cast<char*>(&png_data[0]),
  52                                   png_data.size());
  53
  54   std::string data_url_header = "data:image/png;base64,";
  55   std::string data_url_body;
  56   base::Base64Encode(png_as_string, &data_url_body);
  57   keyframe_data_url_ = GURL(data_url_header + data_url_body);
  58 }
  59
  60 void PluginPreroller::OnThrottleStateChange() {
  61   if (!throttler_->IsThrottled())
  62     return;
  63
  64   ChromePluginPlaceholder* placeholder =
  65       ChromePluginPlaceholder::CreateBlockedPlugin(
  66           render_frame(), frame_, params_, info_, identifier_, name_,
  67           IDR_PLUGIN_POSTER_HTML, message_, keyframe_data_url_);
  68   placeholder->SetPremadePlugin(plugin_, throttler_);
  69   placeholder->set_power_saver_enabled(true);
  70   placeholder->set_allow_loading(true);
  71
  72   blink::WebPluginContainer* container = plugin_->container();
  73   container->setPlugin(placeholder->plugin());
  74
  75   bool success = placeholder->plugin()->initialize(container);
  76   DCHECK(success);
  77
  78   container->invalidate();
  79   container->reportGeometry();
  80
  81   delete this;
  82 }
  83
  84 void PluginPreroller::OnThrottlerDestroyed() {
  85   throttler_ = nullptr;
  86   delete this;
  87 }