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                                  content::PluginInstanceThrottler* throttler)
  24     : RenderFrameObserver(render_frame),
  25       frame_(frame),
  26       params_(params),
  27       info_(info),
  28       identifier_(identifier),
  29       name_(name),
  30       message_(message),
  31       throttler_(throttler) {
  32   DCHECK(throttler);
  33   throttler_->AddObserver(this);
  34 }
  35
  36 PluginPreroller::~PluginPreroller() {
  37   if (throttler_)
  38     throttler_->RemoveObserver(this);
  39 }
  40
  41 void PluginPreroller::OnKeyframeExtracted(const SkBitmap* bitmap) {
  42   std::vector<unsigned char> png_data;
  43   if (!gfx::PNGCodec::EncodeBGRASkBitmap(*bitmap, false, &png_data)) {
  44     DLOG(ERROR) << "Provided keyframe could not be encoded as PNG.";
  45     return;
  46   }
  47
  48   base::StringPiece png_as_string(reinterpret_cast<char*>(&png_data[0]),
  49                                   png_data.size());
  50
  51   std::string data_url_header = "data:image/png;base64,";
  52   std::string data_url_body;
  53   base::Base64Encode(png_as_string, &data_url_body);
  54   keyframe_data_url_ = GURL(data_url_header + data_url_body);
  55 }
  56
  57 void PluginPreroller::OnThrottleStateChange() {
  58   if (!throttler_->IsThrottled())
  59     return;
  60
  61   PlaceholderPosterInfo poster_info;
  62   poster_info.poster_attribute = keyframe_data_url_.spec();
  63   poster_info.custom_poster_size = throttler_->GetSize();
  64
  65   ChromePluginPlaceholder* placeholder =
  66       ChromePluginPlaceholder::CreateBlockedPlugin(
  67           render_frame(), frame_, params_, info_, identifier_, name_,
  68           IDR_PLUGIN_POSTER_HTML, message_, poster_info);
  69   placeholder->SetPremadePlugin(throttler_);
  70   placeholder->set_power_saver_enabled(true);
  71   placeholder->AllowLoading();
  72
  73   blink::WebPluginContainer* container =
  74       throttler_->GetWebPlugin()->container();
  75   container->setPlugin(placeholder->plugin());
  76
  77   bool success = placeholder->plugin()->initialize(container);
  78   DCHECK(success);
  79
  80   container->invalidate();
  81   container->reportGeometry();
  82
  83   delete this;
  84 }
  85
  86 void PluginPreroller::OnThrottlerDestroyed() {
  87   throttler_ = nullptr;
  88   delete this;
  89 }