Implement HiDPI support in Pepper dev interface

ppapi/proxy/ppb_graphics_2d_proxy.cc

 // 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.
 
 #include "ppapi/proxy/ppb_graphics_2d_proxy.h"
 
 #include <string.h>  // For memset.
 
 #include "base/compiler_specific.h"
 #include "base/logging.h"
@@ skipping 25 matching lines @@
   virtual PPB_Graphics2D_API* AsPPB_Graphics2D_API();
 
   // PPB_Graphics_2D_API.
   PP_Bool Describe(PP_Size* size, PP_Bool* is_always_opaque);
   void PaintImageData(PP_Resource image_data,
                       const PP_Point* top_left,
                       const PP_Rect* src_rect);
   void Scroll(const PP_Rect* clip_rect,
               const PP_Point* amount);
   void ReplaceContents(PP_Resource image_data);
+  bool SetScale(float scale);
+  float GetScale();
   int32_t Flush(scoped_refptr<TrackedCallback> callback);
 
   // Notification that the host has sent an ACK for a pending Flush.
   void FlushACK(int32_t result_code);
 
  private:
   PluginDispatcher* GetDispatcher() const {
     return PluginDispatcher::GetForResource(this);
   }
 
   static const ApiID kApiID = API_ID_PPB_GRAPHICS_2D;
 
   PP_Size size_;
   PP_Bool is_always_opaque_;
+  float scale_;
 
   // In the plugin, this is the current callback set for Flushes. When the
   // pointer is non-NULL, we're waiting for a flush ACK.
   scoped_refptr<TrackedCallback> current_flush_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(Graphics2D);
 };
 
 Graphics2D::Graphics2D(const HostResource& host_resource,
                        const PP_Size& size,
                        PP_Bool is_always_opaque)
     : Resource(OBJECT_IS_PROXY, host_resource),
       size_(size),
-      is_always_opaque_(is_always_opaque) {
+      is_always_opaque_(is_always_opaque),
+      scale_(1.0f) {
 }
 
 Graphics2D::~Graphics2D() {
 }
 
 PPB_Graphics2D_API* Graphics2D::AsPPB_Graphics2D_API() {
   return this;
 }
 
 PP_Bool Graphics2D::Describe(PP_Size* size, PP_Bool* is_always_opaque) {
@@ skipping 35 matching lines @@
   if (!image_object || pp_instance() != image_object->pp_instance()) {
     Log(PP_LOGLEVEL_ERROR,
         "PPB_Graphics2D.PaintImageData: Bad image resource.");
     return;
   }
 
   GetDispatcher()->Send(new PpapiHostMsg_PPBGraphics2D_ReplaceContents(
       kApiID, host_resource(), image_object->host_resource()));
 }
 
+bool Graphics2D::SetScale(float scale) {
+  if (scale <= 0.0f)
+    return false;
+  GetDispatcher()->Send(new PpapiHostMsg_PPBGraphics2D_Dev_SetScale(
+      kApiID, host_resource(), scale));
+  scale_ = scale;
+  return true;
+}
+
+float Graphics2D::GetScale() {
+  return scale_;
+}
+
 int32_t Graphics2D::Flush(scoped_refptr<TrackedCallback> callback) {
   if (TrackedCallback::IsPending(current_flush_callback_))
     return PP_ERROR_INPROGRESS;  // Can't have >1 flush pending.
   current_flush_callback_ = callback;
 
   GetDispatcher()->Send(new PpapiHostMsg_PPBGraphics2D_Flush(kApiID,
                                                              host_resource()));
   return PP_OK_COMPLETIONPENDING;
 }
 
@@ skipping 32 matching lines @@
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBGraphics2D_Create,
                         OnHostMsgCreate)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBGraphics2D_PaintImageData,
                         OnHostMsgPaintImageData)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBGraphics2D_Scroll,
                         OnHostMsgScroll)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBGraphics2D_ReplaceContents,
                         OnHostMsgReplaceContents)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBGraphics2D_Flush,
                         OnHostMsgFlush)
+    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBGraphics2D_Dev_SetScale,
+                        OnHostMsgSetScale)
 
     IPC_MESSAGE_HANDLER(PpapiMsg_PPBGraphics2D_FlushACK,
                         OnPluginMsgFlushACK)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   // FIXME(brettw) handle bad messages!
   return handled;
 }
 
 void PPB_Graphics2D_Proxy::OnHostMsgCreate(PP_Instance instance,
@@ skipping 41 matching lines @@
 
 void PPB_Graphics2D_Proxy::OnHostMsgFlush(const HostResource& graphics_2d) {
   EnterHostFromHostResourceForceCallback<PPB_Graphics2D_API> enter(
       graphics_2d, callback_factory_,
       &PPB_Graphics2D_Proxy::SendFlushACKToPlugin, graphics_2d);
   if (enter.failed())
     return;
   enter.SetResult(enter.object()->Flush(enter.callback()));
 }
 
+void PPB_Graphics2D_Proxy::OnHostMsgSetScale(const HostResource& graphics_2d,
+                                             float scale) {
+  EnterHostFromHostResource<PPB_Graphics2D_API> enter(graphics_2d);
+  if (enter.failed())
+    return;
+  enter.object()->SetScale(scale);
+}
+
 void PPB_Graphics2D_Proxy::OnPluginMsgFlushACK(
     const HostResource& host_resource,
     int32_t pp_error) {
   EnterPluginFromHostResource<PPB_Graphics2D_API> enter(host_resource);
   if (enter.succeeded())
     static_cast<Graphics2D*>(enter.object())->FlushACK(pp_error);
 }
 
 void PPB_Graphics2D_Proxy::SendFlushACKToPlugin(
     int32_t result,
     const HostResource& graphics_2d) {
   dispatcher()->Send(new PpapiMsg_PPBGraphics2D_FlushACK(kApiID, graphics_2d,
                                                          result));
 }
 
 }  // namespace proxy
 }  // namespace ppapi