Bug 987498 - Part 4 -Implement SetImageSize on DOMHwMediaStream. r=roc

dom/media/DOMMediaStream.cpp

@@ -733,6 +733,42 @@ DOMHwMediaStream::RequestOverlayId()
 #endif
 }
 
+void
+DOMHwMediaStream::SetImageSize(uint32_t width, uint32_t height)
+{
+#ifdef MOZ_WIDGET_GONK
+  OverlayImage::Data imgData;
+
+  imgData.mOverlayId = mOverlayImage->GetOverlayId();
+  imgData.mSize = IntSize(width, height);
+  mOverlayImage->SetData(imgData);
+#endif
+
+  SourceMediaStream* srcStream = GetStream()->AsSourceStream();
+  StreamBuffer::Track* track = srcStream->FindTrack(TRACK_VIDEO_PRIMARY);
+
+  if (!track || !track->GetSegment()) {
+    return;
+  }
+
+#ifdef MOZ_WIDGET_GONK
+  // Clear the old segment.
+  // Changing the existing content of segment is a Very BAD thing, and this way will
+  // confuse consumers of MediaStreams.
+  // It is only acceptable for DOMHwMediaStream
+  // because DOMHwMediaStream doesn't have consumers of TV streams currently.
+  track->GetSegment()->Clear();
+
+  // Change the image size.
+  const StreamTime delta = STREAM_TIME_MAX;
+  nsRefPtr<Image> image = static_cast<Image*>(mOverlayImage.get());
+  mozilla::gfx::IntSize size = image->GetSize();
+  VideoSegment segment;
+
+  segment.AppendFrame(image.forget(), delta, size);
+  srcStream->AppendToTrack(TRACK_VIDEO_PRIMARY, &segment);
+#endif
+}
 void
 DOMHwMediaStream::SetOverlayId(int32_t aOverlayId)
 {

dom/media/DOMMediaStream.h

@@ -400,6 +400,7 @@ public:
   virtual DOMHwMediaStream* AsDOMHwMediaStream() override { return this; }
   int32_t RequestOverlayId();
   void SetOverlayId(int32_t aOverlayId);
+  void SetImageSize(uint32_t width, uint32_t height);
 
 protected:
   ~DOMHwMediaStream();

dom/media/MediaStreamGraph.cpp

@@ -2496,6 +2496,12 @@ SourceMediaStream::FinishAddTracks()
   }
 }
 
+StreamBuffer::Track*
+SourceMediaStream::FindTrack(TrackID aID)
+{
+  return mBuffer.FindTrack(aID);
+}
+
 void
 SourceMediaStream::ResampleAudioToGraphSampleRate(TrackData* aTrackData, MediaSegment* aSegment)
 {

dom/media/MediaStreamGraph.h

@@ -801,6 +801,11 @@ public:
    */
   void FinishAddTracks();
 
+  /**
+   * Find track by track id.
+   */
+  StreamBuffer::Track* FindTrack(TrackID aID);
+
   /**
    * Append media data to a track. Ownership of aSegment remains with the caller,
    * but aSegment is emptied.

dom/tv/TVTuner.cpp

@@ -220,5 +220,17 @@ TVTuner::DispatchCurrentSourceChangedEvent(TVSource* aSource)
   return NS_DispatchToCurrentThread(runnable);
 }
 
+nsresult
+TVTuner::NotifyImageSizeChanged(uint32_t aWidth, uint32_t aHeight)
+{
+  DOMHwMediaStream* hwMediaStream = mStream->AsDOMHwMediaStream();
+
+  if (hwMediaStream) {
+    hwMediaStream->SetImageSize(aWidth, aHeight);
+  }
+
+  return NS_OK;
+}
+
 } // namespace dom
 } // namespace mozilla

dom/tv/TVTuner.h

@@ -31,6 +31,7 @@ public:
 
   static already_AddRefed<TVTuner> Create(nsPIDOMWindow* aWindow,
                                           nsITVTunerData* aData);
+  nsresult NotifyImageSizeChanged(uint32_t aWidth, uint32_t aHeight);
 
   // WebIDL (internal functions)