media/filters/video_frame_painter.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "media/filters/video_frame_painter.h"
   6
   7 #include "media/base/video_frame.h"
   8
   9 namespace media {
  10
  11 VideoFramePainter::VideoFramePainter(
  12     const base::Closure& invalidate_cb,
  13     const base::Callback<void(gfx::Size)>& natural_size_changed_cb)
  14     : invalidate_cb_(invalidate_cb),
  15       natural_size_changed_cb_(natural_size_changed_cb),
  16       invalidation_finished_(true),
  17       current_frame_painted_(false),
  18       frames_dropped_before_paint_(0) {}
  19
  20 VideoFramePainter::~VideoFramePainter() {}
  21
  22 void VideoFramePainter::UpdateCurrentFrame(
  23     const scoped_refptr<VideoFrame>& frame) {
  24   base::AutoLock auto_lock(lock_);
  25
  26   // Count frames as dropped if and only if we updated the frame but didn't
  27   // finish invalidating nor managed to paint the current frame.
  28   if (!current_frame_painted_ && !invalidation_finished_ &&
  29       frames_dropped_before_paint_ < kuint32max) {
  30     ++frames_dropped_before_paint_;
  31   }
  32
  33   if (current_frame_ &&
  34       current_frame_->natural_size() != frame->natural_size()) {
  35     natural_size_changed_cb_.Run(frame->natural_size());
  36   }
  37
  38   current_frame_ = frame;
  39   current_frame_painted_ = false;
  40
  41   if (!invalidation_finished_)
  42     return;
  43
  44   invalidation_finished_ = false;
  45   invalidate_cb_.Run();
  46 }
  47
  48 scoped_refptr<VideoFrame> VideoFramePainter::GetCurrentFrame(
  49     bool frame_being_painted) {
  50   base::AutoLock auto_lock(lock_);
  51   if (frame_being_painted)
  52     current_frame_painted_ = true;
  53
  54   return current_frame_;
  55 }
  56
  57 void VideoFramePainter::DidFinishInvalidating() {
  58   base::AutoLock auto_lock(lock_);
  59   invalidation_finished_ = true;
  60 }
  61
  62 uint32 VideoFramePainter::GetFramesDroppedBeforePaint() {
  63   base::AutoLock auto_lock(lock_);
  64   return frames_dropped_before_paint_;
  65 }
  66
  67 void VideoFramePainter::SetFramesDroppedBeforePaintForTesting(
  68     uint32 dropped_frames) {
  69   base::AutoLock auto_lock(lock_);
  70   frames_dropped_before_paint_ = dropped_frames;
  71 }
  72
  73 }  // namespace media