Improve plugin performance on the Mac

This makes a few changes:
- Switch to memcpy instead of CG drawing to copy pixels from the transport bitmap to the backing bitmap (this is a substantial perf win).
- Send transparancy information to the WebPluginDelegate, since it's no longer equivalent to not having a background DIB on the Mac (and likely on the other platforms in the future).
- Don't clear the transport DIB for non-transparent plugins, since they will be drawing over whatever is there anyway.

BUG=41340
TEST=Both transparent and non-transparent plugins should continue to draw correctly. Framerates for large CG plugins (e.g., in-window Netflix streaming) should be higher.

Review URL: http://codereview.chromium.org/1629017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@44490 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 6 insertions, 1 deletions

diff --git a/chrome/common/plugin_messages.h b/chrome/common/plugin_messages.h
index bfee6c3..82116d8 100644
--- a/chrome/common/plugin_messages.h
+++ b/chrome/common/plugin_messages.h
@@ -98,6 +98,7 @@ struct PluginMsg_UpdateGeometry_Param {
   gfx::Rect clip_rect;
   TransportDIB::Handle windowless_buffer;
   TransportDIB::Handle background_buffer;
+  bool transparent;
 
 #if defined(OS_MACOSX)
   // This field contains a key that the plug-in process is expected to return
@@ -386,6 +387,7 @@ struct ParamTraits<PluginMsg_UpdateGeometry_Param> {
     WriteParam(m, p.clip_rect);
     WriteParam(m, p.windowless_buffer);
     WriteParam(m, p.background_buffer);
+    WriteParam(m, p.transparent);
 #if defined(OS_MACOSX)
     WriteParam(m, p.ack_key);
 #endif
@@ -395,7 +397,8 @@ struct ParamTraits<PluginMsg_UpdateGeometry_Param> {
       ReadParam(m, iter, &r->window_rect) &&
       ReadParam(m, iter, &r->clip_rect) &&
       ReadParam(m, iter, &r->windowless_buffer) &&
-      ReadParam(m, iter, &r->background_buffer)
+      ReadParam(m, iter, &r->background_buffer) &&
+      ReadParam(m, iter, &r->transparent)
 #if defined(OS_MACOSX)
       &&
       ReadParam(m, iter, &r->ack_key)
@@ -411,6 +414,8 @@ struct ParamTraits<PluginMsg_UpdateGeometry_Param> {
     LogParam(p.windowless_buffer, l);
     l->append(L", ");
     LogParam(p.background_buffer, l);
+    l->append(L", ");
+    LogParam(p.transparent, l);
 #if defined(OS_MACOSX)
     l->append(L", ");
     LogParam(p.ack_key, l);