remoting/host: Rename Capturer to VideoFrameCapturer.

remoting/host/capturer_helper.cc

-// Copyright (c) 2012 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 "remoting/host/capturer_helper.h"
-
-#include <algorithm>
-
-#include "base/logging.h"
-#include "base/memory/scoped_ptr.h"
-
-namespace remoting {
-
-CapturerHelper::CapturerHelper() :
-    size_most_recent_(SkISize::Make(0, 0)),
-    log_grid_size_(0) {
-}
-
-CapturerHelper::~CapturerHelper() {
-}
-
-void CapturerHelper::ClearInvalidRegion() {
-  base::AutoLock auto_invalid_region_lock(invalid_region_lock_);
-  invalid_region_.setEmpty();
-}
-
-void CapturerHelper::InvalidateRegion(const SkRegion& invalid_region) {
-  base::AutoLock auto_invalid_region_lock(invalid_region_lock_);
-  invalid_region_.op(invalid_region, SkRegion::kUnion_Op);
-}
-
-void CapturerHelper::InvalidateScreen(const SkISize& size) {
-  base::AutoLock auto_invalid_region_lock(invalid_region_lock_);
-  invalid_region_.op(SkIRect::MakeWH(size.width(), size.height()),
-                     SkRegion::kUnion_Op);
-}
-
-void CapturerHelper::InvalidateFullScreen() {
-  if (!size_most_recent_.isZero())
-    InvalidateScreen(size_most_recent_);
-}
-
-void CapturerHelper::SwapInvalidRegion(SkRegion* invalid_region) {
-  {
-    base::AutoLock auto_invalid_region_lock(invalid_region_lock_);
-    invalid_region->swap(invalid_region_);
-  }
-  if (log_grid_size_ > 0) {
-    scoped_ptr<SkRegion> expanded_region(
-        ExpandToGrid(*invalid_region, log_grid_size_));
-    invalid_region->swap(*expanded_region);
-    invalid_region->op(SkRegion(SkIRect::MakeSize(size_most_recent_)),
-                       SkRegion::kIntersect_Op);
-  }
-}
-
-void CapturerHelper::SetLogGridSize(int log_grid_size) {
-  log_grid_size_ = log_grid_size;
-}
-
-const SkISize& CapturerHelper::size_most_recent() const {
-  return size_most_recent_;
-}
-
-void CapturerHelper::set_size_most_recent(const SkISize& 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);
-}
-
-scoped_ptr<SkRegion> CapturerHelper::ExpandToGrid(const SkRegion& region,
-                                                  int log_grid_size) {
-  DCHECK(log_grid_size >= 1);
-  int grid_size = 1 << log_grid_size;
-  int grid_size_mask = ~(grid_size - 1);
-  // Count the rects in the region.
-  int rectNum = 0;
-  SkRegion::Iterator iter(region);
-  while (!iter.done()) {
-    iter.next();
-    ++rectNum;
-  }
-  // Expand each rect.
-  scoped_array<SkIRect> rects(new SkIRect[rectNum]);
-  iter.rewind();
-  int rectI = 0;
-  while (!iter.done()) {
-    SkIRect rect = iter.rect();
-    iter.next();
-    int left = std::min(rect.left(), rect.right());
-    int right = std::max(rect.left(), rect.right());
-    int top = std::min(rect.top(), rect.bottom());
-    int bottom = std::max(rect.top(), rect.bottom());
-    left = DownToMultiple(left, grid_size_mask);
-    right = UpToMultiple(right, grid_size, grid_size_mask);
-    top = DownToMultiple(top, grid_size_mask);
-    bottom = UpToMultiple(bottom, grid_size, grid_size_mask);
-    rects[rectI++] = SkIRect::MakeLTRB(left, top, right, bottom);
-  }
-  // Make the union of the expanded rects.
-  scoped_ptr<SkRegion> regionNew(new SkRegion());
-  regionNew->setRects(rects.get(), rectNum);
-  return regionNew.Pass();
-}
-
-}  // namespace remoting