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// Copyright 2013 The Chromium Authors
// 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() = default;
InvalidationRegion::~InvalidationRegion() = default;
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();
pending_bounds.Union(gfx::UnionRects(pending_rects_));
region_ = pending_bounds;
} else {
// Note that this block cannot use gfx::UnionRects(), as the for-loop is
// calling Region::Union() and not gfx::Rect::Union().
for (const auto& rect : pending_rects_) {
region_.Union(rect);
}
}
pending_rects_.clear();
}
} // namespace cc
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