| // Copyright 2013 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 "cc/base/invalidation_region.h" |
| |
| #include "base/metrics/histogram.h" |
| |
| namespace { |
| |
| const int kMaxInvalidationRectCount = 256; |
| |
| } // namespace |
| |
| namespace cc { |
| |
| InvalidationRegion::InvalidationRegion() {} |
| |
| InvalidationRegion::~InvalidationRegion() {} |
| |
| void InvalidationRegion::Swap(Region* region) { |
| FinalizePendingRects(); |
| region_.Swap(region); |
| } |
| |
| void InvalidationRegion::Clear() { |
| pending_rects_.clear(); |
| region_.Clear(); |
| } |
| |
| void InvalidationRegion::Union(const gfx::Rect& rect) { |
| if (pending_rects_.size() >= kMaxInvalidationRectCount) |
| pending_rects_[0].Union(rect); |
| else |
| pending_rects_.push_back(rect); |
| } |
| |
| void InvalidationRegion::FinalizePendingRects() { |
| if (pending_rects_.empty()) |
| return; |
| |
| if (region_.GetRegionComplexity() + pending_rects_.size() > |
| kMaxInvalidationRectCount) { |
| gfx::Rect pending_bounds = region_.bounds(); |
| for (auto& rect : pending_rects_) |
| pending_bounds.Union(rect); |
| region_ = pending_bounds; |
| } else { |
| for (auto& rect : pending_rects_) |
| region_.Union(rect); |
| } |
| |
| pending_rects_.clear(); |
| } |
| |
| } // namespace cc |