cc/base/invalidation_region.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "cc/base/invalidation_region.h"
   6
   7 #include "base/metrics/histogram.h"
   8
   9 namespace {
  10
  11 const int kMaxInvalidationRectCount = 256;
  12
  13 }  // namespace
  14
  15 namespace cc {
  16
  17 InvalidationRegion::InvalidationRegion() {}
  18
  19 InvalidationRegion::~InvalidationRegion() {}
  20
  21 void InvalidationRegion::Swap(Region* region) {
  22   UMA_HISTOGRAM_CUSTOM_COUNTS(
  23       "Renderer4.InvalidationRegionApproximateRectCount",
  24       region_.GetRegionComplexity(),
  25       1,
  26       5000,
  27       50);
  28
  29   SimplifyIfNeeded();
  30   region_.Swap(region);
  31 }
  32
  33 void InvalidationRegion::Clear() {
  34   region_.Clear();
  35 }
  36
  37 void InvalidationRegion::Union(gfx::Rect rect) {
  38   // TODO(vmpstr): We should simplify the region after Union() after we get a
  39   // good idea of what kind of regions are typical (from the UMA histogram).
  40   region_.Union(rect);
  41 }
  42
  43 void InvalidationRegion::SimplifyIfNeeded() {
  44   if (region_.GetRegionComplexity() > kMaxInvalidationRectCount)
  45     region_ = region_.bounds();
  46 }
  47
  48 }  // namespace cc