Add a new API in WebMediaPlayer to do a GPU-GPU textures copy if possible.

Signed-off-by: Jun Jiang <jun.a.jiang@intel.com>

BUG=179754


Review URL: https://chromiumcodereview.appspot.com/12412007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@187827 0039d316-1c4b-4281-b951-d872f2087c98

AUTHORS

@@ -230,3 +230,4 @@ Opera Software ASA <*@opera.com>
 Johannes Rudolph <johannes.rudolph@googlemail.com>
 Aaron Jacobs <samusaaron3@gmail.com>
 Sam Larison <qufighter@gmail.com>
+Jun Jiang <jun.a.jiang@intel.com>

webkit/media/webmediaplayer_impl.cc

@@ -15,6 +15,7 @@
 #include "base/metrics/histogram.h"
 #include "base/string_number_conversions.h"
 #include "base/synchronization/waitable_event.h"
+#include "gpu/GLES2/gl2extchromium.h"
 #include "media/audio/null_audio_sink.h"
 #include "media/base/bind_to_loop.h"
 #include "media/base/filter_collection.h"
@@ -670,6 +671,44 @@ void WebMediaPlayerImpl::putCurrentFrame(
   delete web_video_frame;
 }
 
+bool WebMediaPlayerImpl::copyVideoTextureToPlatformTexture(
+    WebKit::WebGraphicsContext3D* web_graphics_context,
+    unsigned int texture,
+    unsigned int level,
+    unsigned int internal_format,
+    bool premultiply_alpha,
+    bool flip_y) {
+  scoped_refptr<media::VideoFrame> video_frame;
+  {
+    base::AutoLock auto_lock(lock_);
+    video_frame = current_frame_;
+  }
+  if (video_frame &&
+      video_frame->format() == media::VideoFrame::NATIVE_TEXTURE &&
+      video_frame->texture_target() == GL_TEXTURE_2D) {
+    uint32 source_texture = video_frame->texture_id();
+    // The video is stored in a unmultiplied format, so premultiply
+    // if necessary.
+    web_graphics_context->pixelStorei(GL_UNPACK_PREMULTIPLY_ALPHA_CHROMIUM,
+        premultiply_alpha);
+    // Application itself needs to take care of setting the right flip_y
+    // value down to get the expected result.
+    // flip_y==true means to reverse the video orientation while
+    // flip_y==false means to keep the intrinsic orientation.
+    web_graphics_context->pixelStorei(GL_UNPACK_FLIP_Y_CHROMIUM, flip_y);
+    web_graphics_context->copyTextureCHROMIUM(GL_TEXTURE_2D,
+        source_texture, texture, level, internal_format);
+    web_graphics_context->pixelStorei(GL_UNPACK_FLIP_Y_CHROMIUM, false);
+    web_graphics_context->pixelStorei(GL_UNPACK_PREMULTIPLY_ALPHA_CHROMIUM,
+        false);
+    // The flush() operation is not necessary here. It is kept since the
+    // performance will be better when it is added than not.
+    web_graphics_context->flush();
+    return true;
+  }
+  return false;
+}
+
 // Helper enum for reporting generateKeyRequest/addKey histograms.
 enum MediaKeyException {
   kUnknownResultId,

webkit/media/webmediaplayer_impl.h

@@ -32,6 +32,7 @@
 #include "media/base/pipeline.h"
 #include "media/filters/skcanvas_video_renderer.h"
 #include "skia/ext/platform_canvas.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebGraphicsContext3D.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebAudioSourceProvider.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebMediaPlayer.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebMediaPlayerClient.h"
@@ -143,6 +144,14 @@ class WebMediaPlayerImpl
   virtual WebKit::WebVideoFrame* getCurrentFrame();
   virtual void putCurrentFrame(WebKit::WebVideoFrame* web_video_frame);
 
+  virtual bool copyVideoTextureToPlatformTexture(
+      WebKit::WebGraphicsContext3D* web_graphics_context,
+      unsigned int texture,
+      unsigned int level,
+      unsigned int internal_format,
+      bool premultiply_alpha,
+      bool flip_y);
+
   virtual WebKit::WebAudioSourceProvider* audioSourceProvider();
 
   virtual MediaKeyException generateKeyRequest(