Screen Video Capture: Implement suspend optimization.

media/capture/content/android/screen_capture_machine_android.cc

 // Copyright 2016 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 "media/capture/content/android/screen_capture_machine_android.h"
 
 #include "base/android/context_utils.h"
 #include "base/android/jni_android.h"
 #include "base/android/scoped_java_ref.h"
 #include "jni/ScreenCapture_jni.h"
 #include "media/capture/content/video_capture_oracle.h"
 #include "third_party/libyuv/include/libyuv.h"
 
 using base::android::AttachCurrentThread;
 using base::android::ScopedJavaLocalRef;
 
 namespace media {
 
 // static
 bool ScreenCaptureMachineAndroid::RegisterScreenCaptureMachine(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
-ScreenCaptureMachineAndroid::ScreenCaptureMachineAndroid() {}
+ScreenCaptureMachineAndroid::ScreenCaptureMachineAndroid()
+    : suspend_frame_capture_(false) {}
 
 ScreenCaptureMachineAndroid::~ScreenCaptureMachineAndroid() {}
 
 // static
 ScopedJavaLocalRef<jobject>
 ScreenCaptureMachineAndroid::createScreenCaptureMachineAndroid(
     jlong nativeScreenCaptureMachineAndroid) {
   return (Java_ScreenCapture_createScreenCaptureMachine(
       AttachCurrentThread(), base::android::GetApplicationContext(),
       nativeScreenCaptureMachineAndroid));
 }
 
 void ScreenCaptureMachineAndroid::OnRGBAFrameAvailable(JNIEnv* env,
                                                        jobject obj,
                                                        jobject buf,
                                                        jint row_stride,
                                                        jint left,
                                                        jint top,
                                                        jint width,
                                                        jint height,
                                                        jlong timestamp) {
+  if (suspend_frame_capture_)
+    return;
+
   const VideoCaptureOracle::Event event = VideoCaptureOracle::kCompositorUpdate;
   const uint64_t absolute_micro =
       timestamp / base::Time::kNanosecondsPerMicrosecond;
   const base::TimeTicks start_time =
       base::TimeTicks() + base::TimeDelta::FromMicroseconds(absolute_micro);
   scoped_refptr<VideoFrame> frame;
   ThreadSafeCaptureOracle::CaptureFrameCallback capture_frame_cb;
 
   if (!oracle_proxy_->ObserveEventAndDecideCapture(
           event, gfx::Rect(), start_time, &frame, &capture_frame_cb)) {
@@ skipping 55 matching lines @@
                                                        jint y_stride,
                                                        jobject u_buffer,
                                                        jobject v_buffer,
                                                        jint uv_row_stride,
                                                        jint uv_pixel_stride,
                                                        jint left,
                                                        jint top,
                                                        jint width,
                                                        jint height,
                                                        jlong timestamp) {
+  if (suspend_frame_capture_)
+    return;
+
   const VideoCaptureOracle::Event event = VideoCaptureOracle::kCompositorUpdate;
   const uint64_t absolute_micro =
       timestamp / base::Time::kNanosecondsPerMicrosecond;
   const base::TimeTicks start_time =
       base::TimeTicks() + base::TimeDelta::FromMicroseconds(absolute_micro);
   scoped_refptr<VideoFrame> frame;
   ThreadSafeCaptureOracle::CaptureFrameCallback capture_frame_cb;
 
   if (!oracle_proxy_->ObserveEventAndDecideCapture(
           event, gfx::Rect(), start_time, &frame, &capture_frame_cb)) {
@@ skipping 136 matching lines @@
       frame->visible_data(VideoFrame::kUPlane),
       frame->stride(VideoFrame::kUPlane),
       frame->visible_data(VideoFrame::kVPlane),
       frame->stride(VideoFrame::kVPlane), frame->visible_rect().width(),
       frame->visible_rect().height(), libyuv::kFilterBilinear);
 
   capture_frame_cb.Run(frame, start_time, true);
 }
 
 }  // namespace media