Revert of BlankDetectorDesktopCapturerWrapper to detect a blank DesktopFrame

webrtc/modules/desktop_capture/blank_detector_desktop_capturer_wrapper.cc

Index: webrtc/modules/desktop_capture/blank_detector_desktop_capturer_wrapper.cc
diff --git a/webrtc/modules/desktop_capture/blank_detector_desktop_capturer_wrapper.cc b/webrtc/modules/desktop_capture/blank_detector_desktop_capturer_wrapper.cc
deleted file mode 100644
index b2cc2848c4ff9e3829f58544ffe79c5fadbf54ca..0000000000000000000000000000000000000000
--- a/webrtc/modules/desktop_capture/blank_detector_desktop_capturer_wrapper.cc
+++ /dev/null
@@ -1,118 +0,0 @@
-/*
- *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#include "webrtc/modules/desktop_capture/blank_detector_desktop_capturer_wrapper.h"
-
-#include <algorithm>
-#include <utility>
-
-#include "webrtc/base/checks.h"
-#include "webrtc/modules/desktop_capture/desktop_geometry.h"
-#include "webrtc/system_wrappers/include/metrics.h"
-
-namespace webrtc {
-
-BlankDetectorDesktopCapturerWrapper::BlankDetectorDesktopCapturerWrapper(
-    std::unique_ptr<DesktopCapturer> capturer,
-    RgbaColor blank_pixel)
-    : capturer_(std::move(capturer)),
-      blank_pixel_(blank_pixel) {
-  RTC_DCHECK(capturer_);
-}
-
-BlankDetectorDesktopCapturerWrapper::~BlankDetectorDesktopCapturerWrapper() =
-    default;
-
-void BlankDetectorDesktopCapturerWrapper::Start(
-    DesktopCapturer::Callback* callback) {
-  capturer_->Start(this);
-  callback_ = callback;
-}
-
-void BlankDetectorDesktopCapturerWrapper::SetSharedMemoryFactory(
-    std::unique_ptr<SharedMemoryFactory> shared_memory_factory) {
-  capturer_->SetSharedMemoryFactory(std::move(shared_memory_factory));
-}
-
-void BlankDetectorDesktopCapturerWrapper::CaptureFrame() {
-  RTC_DCHECK(callback_);
-  capturer_->CaptureFrame();
-}
-
-void BlankDetectorDesktopCapturerWrapper::SetExcludedWindow(WindowId window) {
-  capturer_->SetExcludedWindow(window);
-}
-
-bool BlankDetectorDesktopCapturerWrapper::GetSourceList(SourceList* sources) {
-  return capturer_->GetSourceList(sources);
-}
-
-bool BlankDetectorDesktopCapturerWrapper::SelectSource(SourceId id) {
-  return capturer_->SelectSource(id);
-}
-
-bool BlankDetectorDesktopCapturerWrapper::FocusOnSelectedSource() {
-  return capturer_->FocusOnSelectedSource();
-}
-
-void BlankDetectorDesktopCapturerWrapper::OnCaptureResult(
-    Result result,
-    std::unique_ptr<DesktopFrame> frame) {
-  RTC_DCHECK(callback_);
-  if (result != Result::SUCCESS || non_blank_frame_received_) {
-    callback_->OnCaptureResult(result, std::move(frame));
-    return;
-  }
-
-  RTC_DCHECK(frame);
-
-  // If nothing has been changed in current frame, we do not need to check it
-  // again.
-  if (!frame->updated_region().is_empty() || is_first_frame_) {
-    last_frame_is_blank_ = IsBlankFrame(*frame);
-    is_first_frame_ = false;
-  }
-  RTC_HISTOGRAM_BOOLEAN("WebRTC.DesktopCapture.BlankFrameDetected",
-                        last_frame_is_blank_);
-  if (!last_frame_is_blank_) {
-    non_blank_frame_received_ = true;
-    callback_->OnCaptureResult(Result::SUCCESS, std::move(frame));
-    return;
-  }
-
-  callback_->OnCaptureResult(Result::ERROR_TEMPORARY,
-                             std::unique_ptr<DesktopFrame>());
-}
-
-bool BlankDetectorDesktopCapturerWrapper::IsBlankFrame(
-    const DesktopFrame& frame) const {
-  // We will check 7489 pixels for a frame with 1024 x 768 resolution.
-  for (int i = 0; i < frame.size().width() * frame.size().height(); i += 105) {
-    const int x = i % frame.size().width();
-    const int y = i / frame.size().width();
-    if (!IsBlankPixel(frame, x, y)) {
-      return false;
-    }
-  }
-
-  // We are verifying the pixel in the center as well.
-  return IsBlankPixel(frame, frame.size().width() / 2,
-                      frame.size().height() / 2);
-}
-
-bool BlankDetectorDesktopCapturerWrapper::IsBlankPixel(
-    const DesktopFrame& frame,
-    int x,
-    int y) const {
-  uint8_t* pixel_data = frame.GetFrameDataAtPos(DesktopVector(x, y));
-  return RgbaColor(pixel_data) == blank_pixel_;
-}
-
-}  // namespace webrtc