Added SetLayerTransform to PPAPI

ppapi/proxy/graphics_2d_resource.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/graphics_2d_resource.h"
 
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/pp_point.h"
 #include "ppapi/c/pp_rect.h"
 #include "ppapi/c/pp_resource.h"
@@ skipping 95 matching lines @@
     return PP_FALSE;
   Post(RENDERER, PpapiHostMsg_Graphics2D_SetScale(scale));
   scale_ = scale;
   return PP_TRUE;
 }
 
 float Graphics2DResource::GetScale() {
   return scale_;
 }
 
+PP_Bool Graphics2DResource::SetLayerTransform(float scale,
+                                              const PP_Point* origin,
+                                              const PP_Point* translate) {
+  if (scale <= 0.0f)
+    return PP_FALSE;
+  // Adding the origin to the transform.
+  PP_FloatPoint translate_with_origin;
+  translate_with_origin.x = (1 - scale) * origin->x - translate->x;
+  translate_with_origin.y = (1 - scale) * origin->y - translate->y;
+  Post(RENDERER,
+       PpapiHostMsg_Graphics2D_SetLayerTransform(scale, translate_with_origin));
+  return PP_TRUE;
+}
+
 int32_t Graphics2DResource::Flush(scoped_refptr<TrackedCallback> callback) {
   // If host is not even created, return failure immediately.  This can happen
   // when failed to initialize (in constructor).
   if (!sent_create_to_renderer())
     return PP_ERROR_FAILED;
 
   if (TrackedCallback::IsPending(current_flush_callback_))
     return PP_ERROR_INPROGRESS;  // Can't have >1 flush pending.
   current_flush_callback_ = callback;
 
@@ skipping 14 matching lines @@
   return result == PP_OK;
 }
 
 void Graphics2DResource::OnPluginMsgFlushACK(
     const ResourceMessageReplyParams& params) {
   current_flush_callback_->Run(params.result());
 }
 
 }  // namespace proxy
 }  // namespace ppapi