Merge changes I7bbf776e,I1b827825

am: fe8b4a6579

* commit 'fe8b4a657979b49e1701bd92f6d5814a99e0b2be': (7237 commits)
  WIP: Changes after merge commit 'cb3f9bd'
  Make the nonlinear beamformer steerable
  Utilize bitrate above codec max to protect video.
  Enable VP9 internal resize by default.
  Filter overlapping RTP header extensions.
  Make VCMEncodedFrameCallback const.
  MediaCodecVideoEncoder: Add number of quality resolution downscales to Encoded callback.
  Remove redudant encoder rate calls.
  Create isolate files for nonparallel tests.
  Register header extensions in RtpRtcpObserver to avoid log spam.
  Make an enum class out of NetEqDecoder, and hide the neteq_decoders_ table
  ACM: Move NACK functionality inside NetEq
  Fix chromium-style warnings in webrtc/sound/.
  Create a 'webrtc_nonparallel_tests' target.
  Update scalability structure data according to updates in the RTP payload profile.
  audio_coding: rename interface -> include
  Rewrote perform_action_on_all_files to be parallell.
  Update reference indices according to updates in the RTP payload profile.
  Disable P2PTransport...TestFailoverControlledSide on Memcheck
  pass clangcl compile options to ignore warnings in gflags.cc
  ...

1 files changed, 104 insertions, 0 deletions

diff --git a/webrtc/modules/desktop_capture/screen_capturer_helper.cc b/webrtc/modules/desktop_capture/screen_capturer_helper.cc
new file mode 100644
index 0000000000..fa7096d24d
--- /dev/null
+++ b/webrtc/modules/desktop_capture/screen_capturer_helper.cc
@@ -0,0 +1,104 @@
+/*
+ *  Copyright (c) 2013 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/screen_capturer_helper.h"
+
+#include <assert.h>
+#include <algorithm>
+
+#include "webrtc/system_wrappers/include/logging.h"
+
+namespace webrtc {
+
+ScreenCapturerHelper::ScreenCapturerHelper()
+    : invalid_region_lock_(RWLockWrapper::CreateRWLock()),
+      log_grid_size_(0) {
+}
+
+ScreenCapturerHelper::~ScreenCapturerHelper() {
+}
+
+void ScreenCapturerHelper::ClearInvalidRegion() {
+  WriteLockScoped scoped_invalid_region_lock(*invalid_region_lock_);
+  invalid_region_.Clear();
+}
+
+void ScreenCapturerHelper::InvalidateRegion(
+    const DesktopRegion& invalid_region) {
+  WriteLockScoped scoped_invalid_region_lock(*invalid_region_lock_);
+  invalid_region_.AddRegion(invalid_region);
+}
+
+void ScreenCapturerHelper::InvalidateScreen(const DesktopSize& size) {
+  WriteLockScoped scoped_invalid_region_lock(*invalid_region_lock_);
+  invalid_region_.AddRect(DesktopRect::MakeSize(size));
+}
+
+void ScreenCapturerHelper::TakeInvalidRegion(
+    DesktopRegion* invalid_region) {
+  invalid_region->Clear();
+
+  {
+    WriteLockScoped scoped_invalid_region_lock(*invalid_region_lock_);
+    invalid_region->Swap(&invalid_region_);
+  }
+
+  if (log_grid_size_ > 0) {
+    DesktopRegion expanded_region;
+    ExpandToGrid(*invalid_region, log_grid_size_, &expanded_region);
+    expanded_region.Swap(invalid_region);
+
+    invalid_region->IntersectWith(DesktopRect::MakeSize(size_most_recent_));
+  }
+}
+
+void ScreenCapturerHelper::SetLogGridSize(int log_grid_size) {
+  log_grid_size_ = log_grid_size;
+}
+
+const DesktopSize& ScreenCapturerHelper::size_most_recent() const {
+  return size_most_recent_;
+}
+
+void ScreenCapturerHelper::set_size_most_recent(
+    const DesktopSize& size) {
+  size_most_recent_ = size;
+}
+
+// Returns the largest multiple of |n| that is <= |x|.
+// |n| must be a power of 2. |nMask| is ~(|n| - 1).
+static int DownToMultiple(int x, int nMask) {
+  return (x & nMask);
+}
+
+// Returns the smallest multiple of |n| that is >= |x|.
+// |n| must be a power of 2. |nMask| is ~(|n| - 1).
+static int UpToMultiple(int x, int n, int nMask) {
+  return ((x + n - 1) & nMask);
+}
+
+void ScreenCapturerHelper::ExpandToGrid(const DesktopRegion& region,
+                                        int log_grid_size,
+                                        DesktopRegion* result) {
+  assert(log_grid_size >= 1);
+  int grid_size = 1 << log_grid_size;
+  int grid_size_mask = ~(grid_size - 1);
+
+  result->Clear();
+  for (DesktopRegion::Iterator it(region); !it.IsAtEnd(); it.Advance()) {
+    int left = DownToMultiple(it.rect().left(), grid_size_mask);
+    int right = UpToMultiple(it.rect().right(), grid_size, grid_size_mask);
+    int top = DownToMultiple(it.rect().top(), grid_size_mask);
+    int bottom = UpToMultiple(it.rect().bottom(), grid_size, grid_size_mask);
+    result->AddRect(DesktopRect::MakeLTRB(left, top, right, bottom));
+  }
+}
+
+}  // namespace webrtc