Switch over to using SkRegions to calculate dirty areas.

remoting/host/capturer_helper.cc

Index: remoting/host/capturer_helper.cc
diff --git a/remoting/host/capturer_helper.cc b/remoting/host/capturer_helper.cc
index eba7c1260821c6ff0e0b5d7ba38f0c0492780a5c..12e7d86782938fa6b953c9c2648444e1a7fdd8ef 100644
--- a/remoting/host/capturer_helper.cc
+++ b/remoting/host/capturer_helper.cc
@@ -4,9 +4,6 @@
 
 #include "remoting/host/capturer_helper.h"
 
-#include <algorithm>
-#include <iterator>
-
 namespace remoting {
 
 CapturerHelper::CapturerHelper() : size_most_recent_(0, 0) {
@@ -15,24 +12,20 @@ CapturerHelper::CapturerHelper() : size_most_recent_(0, 0) {
 CapturerHelper::~CapturerHelper() {
 }
 
-void CapturerHelper::ClearInvalidRects() {
-  base::AutoLock auto_inval_rects_lock(inval_rects_lock_);
-  inval_rects_.clear();
+void CapturerHelper::ClearInvalidRegion() {
+  base::AutoLock auto_invalid_region_lock(invalid_region_lock_);
+  invalid_region_.setEmpty();
 }
 
-void CapturerHelper::InvalidateRects(const InvalidRects& inval_rects) {
-  base::AutoLock auto_inval_rects_lock(inval_rects_lock_);
-  InvalidRects temp_rects;
-  std::set_union(inval_rects_.begin(), inval_rects_.end(),
-                 inval_rects.begin(), inval_rects.end(),
-                 std::inserter(temp_rects, temp_rects.begin()));
-  inval_rects_.swap(temp_rects);
+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 gfx::Size& size) {
-  base::AutoLock auto_inval_rects_lock(inval_rects_lock_);
-  inval_rects_.clear();
-  inval_rects_.insert(gfx::Rect(0, 0, size.width(), size.height()));
+  base::AutoLock auto_invalid_region_lock(invalid_region_lock_);
+  invalid_region_.op(SkIRect::MakeWH(size.width(), size.height()),
+                     SkRegion::kUnion_Op);
 }
 
 void CapturerHelper::InvalidateFullScreen() {
@@ -40,17 +33,9 @@ void CapturerHelper::InvalidateFullScreen() {
     InvalidateScreen(size_most_recent_);
 }
 
-bool CapturerHelper::IsCaptureFullScreen(const gfx::Size& size) {
-  base::AutoLock auto_inval_rects_lock(inval_rects_lock_);
-  return inval_rects_.size() == 1u &&
-      inval_rects_.begin()->x() == 0 && inval_rects_.begin()->y() == 0 &&
-      inval_rects_.begin()->width() == size.width() &&
-      inval_rects_.begin()->height() == size.height();
-}
-
-void CapturerHelper::SwapInvalidRects(InvalidRects& inval_rects) {
-  base::AutoLock auto_inval_rects_lock(inval_rects_lock_);
-  inval_rects.swap(inval_rects_);
+void CapturerHelper::SwapInvalidRegion(SkRegion* invalid_region) {
+  base::AutoLock auto_invalid_region_lock(invalid_region_lock_);
+  invalid_region->swap(invalid_region_);
 }
 
 const gfx::Size& CapturerHelper::size_most_recent() const {