Improve scrolling performance in OOP PDF

pdf/out_of_process_instance.h

 // Copyright (c) 2012 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.
 
 #ifndef PDF_OUT_OF_PROCESS_INSTANCE_H_
 #define PDF_OUT_OF_PROCESS_INSTANCE_H_
 
 #include <queue>
 #include <set>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "pdf/paint_manager.h"
 #include "pdf/pdf_engine.h"
 #include "pdf/preview_mode_client.h"
 
 #include "ppapi/c/private/ppb_pdf.h"
 #include "ppapi/cpp/dev/printing_dev.h"
 #include "ppapi/cpp/dev/scriptable_object_deprecated.h"
 #include "ppapi/cpp/dev/selection_dev.h"
 #include "ppapi/cpp/graphics_2d.h"
 #include "ppapi/cpp/image_data.h"
 #include "ppapi/cpp/input_event.h"
 #include "ppapi/cpp/instance.h"
 #include "ppapi/cpp/private/find_private.h"
 #include "ppapi/cpp/private/uma_private.h"
-#include "ppapi/cpp/private/var_private.h"
 #include "ppapi/cpp/url_loader.h"
 #include "ppapi/utility/completion_callback_factory.h"
 
 namespace pp {
 class TextInput_Dev;
 }
 
 namespace chrome_pdf {
 
 class OutOfProcessInstance : public pp::Instance,
@@ skipping 158 matching lines @@
 
   // Process the preview page data information. |src_url| specifies the preview
   // page data location. The |src_url| is in the format:
   // chrome://print/id/page_number/print.pdf
   // |dst_page_index| specifies the blank page index that needs to be replaced
   // with the new page data.
   void ProcessPreviewPageInfo(const std::string& src_url, int dst_page_index);
   // Load the next available preview page into the blank page.
   void LoadAvailablePreviewPage();
 
+  // Bound the given scroll offset to the document.
+  pp::Point BoundScrollOffsetToDocument(const pp::Point& scroll_offset);
+
   pp::ImageData image_data_;
   // Used when the plugin is embedded in a page and we have to create the loader
   // ourself.
   pp::CompletionCallbackFactory<OutOfProcessInstance> loader_factory_;
   pp::URLLoader embed_loader_;
   pp::URLLoader embed_preview_loader_;
 
   PP_CursorType_Dev cursor_;  // The current cursor.
 
   pp::CompletionCallbackFactory<OutOfProcessInstance> timer_factory_;
@@ skipping 59 matching lines @@
 
   // Used for printing without re-entrancy issues.
   pp::CompletionCallbackFactory<OutOfProcessInstance> print_callback_factory_;
 
   // True if we haven't painted the plugin viewport yet.
   bool first_paint_;
 
   DocumentLoadState document_load_state_;
   DocumentLoadState preview_document_load_state_;
 
-  // JavaScript interface to control this instance.
-  // This wraps a PDFScriptableObject in a pp::Var.
-  pp::VarPrivate instance_object_;
-
   // A UMA resource for histogram reporting.
   pp::UMAPrivate uma_;
 
   // Used so that we only tell the browser once about an unsupported feature, to
   // avoid the infobar going up more than once.
   bool told_browser_about_unsupported_feature_;
 
   // Keeps track of which unsupported features we reported, so we avoid spamming
   // the stats if a feature shows up many times per document.
   std::set<std::string> unsupported_features_reported_;
@@ skipping 25 matching lines @@
 
   // Whether the plugin has received a viewport changed message. Nothing should
   // be painted until this is received.
   bool received_viewport_message_;
 
   // If true, this means we told the RenderView that we're starting a network
   // request so that it can start the throbber. We will tell it again once the
   // document finishes loading.
   bool did_call_start_loading_;
 
+  // If this is true, then don't scroll the plugin in response to DidChangeView
+  // messages. This will be true when the extension page is in the process of
+  // zooming the plugin so that flickering doesn't occur while zooming.
+  bool stop_scrolling_;
+
   // The callback for receiving the password from the page.
   scoped_ptr<pp::CompletionCallbackWithOutput<pp::Var> > password_callback_;
 };
 
 }  // namespace chrome_pdf
 
 #endif  // PDF_OUT_OF_PROCESS_INSTANCE_H_