Make Chromoting client plugin always render at device DPI.

remoting/client/plugin/pepper_view.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.
 
 // This class is an implementation of the ChromotingView for Pepper.  It is
 // callable only on the Pepper thread.
 
 #ifndef REMOTING_CLIENT_PLUGIN_PEPPER_VIEW_H_
 #define REMOTING_CLIENT_PLUGIN_PEPPER_VIEW_H_
 
 #include <list>
 
 #include "base/memory/weak_ptr.h"
 #include "ppapi/cpp/graphics_2d.h"
+#include "ppapi/cpp/view.h"
 #include "ppapi/cpp/point.h"
 #include "remoting/client/chromoting_view.h"
 #include "remoting/client/frame_consumer.h"
 
 namespace remoting {
 
 class ChromotingInstance;
 class ClientContext;
 class FrameProducer;
 
@@ skipping 18 matching lines @@
   virtual protocol::CursorShapeStub* GetCursorShapeStub() OVERRIDE;
 
   // FrameConsumer implementation.
   virtual void ApplyBuffer(const SkISize& view_size,
                            const SkIRect& clip_area,
                            pp::ImageData* buffer,
                            const SkRegion& region) OVERRIDE;
   virtual void ReturnBuffer(pp::ImageData* buffer) OVERRIDE;
   virtual void SetSourceSize(const SkISize& source_size) OVERRIDE;
 
-  // Sets the display size and clipping area of this view.
-  void SetView(const SkISize& view_size, const SkIRect& clip_area);
+  // Updates the PepperView's size, clipping area and scale factor.
+  void SetView(const pp::View& view);
 
-  // Return the client view and original host dimensions.
+  // Return the dimensions of the view and source in device pixels.
   const SkISize& get_view_size() const {
     return view_size_;
   }
   const SkISize& get_screen_size() const {
     return source_size_;
   }
 
+  // Return the dimensions of the view in Density Independent Pixels (DIPs).
+  // On high-DPI devices this will be smaller than the size in device pixels.
+  const SkISize& get_view_size_dips() const {
+    return view_size_dips_;
+  }
+
  private:
   // This routine allocates an image buffer.
   pp::ImageData* AllocateBuffer();
 
   // This routine frees an image buffer allocated by AllocateBuffer().
   void FreeBuffer(pp::ImageData* buffer);
 
   // This routine makes sure that enough image buffers are in flight to keep
   // the decoding pipeline busy.
   void InitiateDrawing();
@@ skipping 16 matching lines @@
   // Context should be constant for the lifetime of the plugin.
   ClientContext* const context_;
 
   pp::Graphics2D graphics2d_;
 
   FrameProducer* producer_;
 
   // List of allocated image buffers.
   std::list<pp::ImageData*> buffers_;
 
+  // Queued buffer to paint, with clip area and dirty region in device pixels.
   pp::ImageData* merge_buffer_;
   SkIRect merge_clip_area_;
   SkRegion merge_region_;
 
-  // The size of the plugin element.
+  // View size, clip area and host dimensions, in device pixels.
   SkISize view_size_;
+  SkIRect clip_area_;
+  SkISize source_size_;
 
-  // The current clip area rectangle.
-  SkIRect clip_area_;
+  // View size in Density-Independent pixels.
+  SkISize view_size_dips_;
 
-  // The size of the host screen.
-  SkISize source_size_;
+  // DIP-to-device pixel scale factor.
+  float view_scale_;
 
   // True if there is already a Flush() pending on the Graphics2D context.
   bool flush_pending_;
 
   // True after Initialize() has been called, until TearDown().
   bool is_initialized_;
 
   // True after the first call to ApplyBuffer().
   bool frame_received_;
 
   DISALLOW_COPY_AND_ASSIGN(PepperView);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_CLIENT_PLUGIN_PEPPER_VIEW_H_