Index: third_party/WebKit/Source/platform/graphics/paint/GeometryMapperClipCache.cpp |
diff --git a/third_party/WebKit/Source/platform/graphics/paint/GeometryMapperClipCache.cpp b/third_party/WebKit/Source/platform/graphics/paint/GeometryMapperClipCache.cpp |
new file mode 100644 |
index 0000000000000000000000000000000000000000..5dd8982781fbfb34038b7f1f2a716afafc92277a |
--- /dev/null |
+++ b/third_party/WebKit/Source/platform/graphics/paint/GeometryMapperClipCache.cpp |
@@ -0,0 +1,54 @@ |
+// Copyright 2017 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 "platform/graphics/paint/GeometryMapperClipCache.h" |
+ |
+#include "platform/graphics/paint/FloatClipRect.h" |
+ |
+namespace blink { |
+ |
+// All clip caches invalidate themselves by tracking a local cache generation, |
+// and invalidating their cache if their cache generation disagrees with |
+// s_clipCacheGeneration. |
+static unsigned s_clipCacheGeneration = 0; |
+ |
+GeometryMapperClipCache::GeometryMapperClipCache() |
+ : m_cacheGeneration(s_clipCacheGeneration) {} |
+ |
+void GeometryMapperClipCache::clearCache() { |
+ s_clipCacheGeneration++; |
+} |
+ |
+void GeometryMapperClipCache::invalidateCacheIfNeeded() { |
+ if (m_cacheGeneration != s_clipCacheGeneration) { |
+ m_clipCache.clear(); |
+ m_cacheGeneration = s_clipCacheGeneration; |
+ } |
+} |
+ |
+const FloatClipRect* GeometryMapperClipCache::getCachedClip( |
+ const ClipAndTransform& clipAndTransform) { |
+ invalidateCacheIfNeeded(); |
+ for (const auto& entry : m_clipCache) { |
+ if (entry.clipAndTransform == clipAndTransform) { |
+ return &entry.clipRect; |
+ } |
+ } |
+ return nullptr; |
+} |
+ |
+void GeometryMapperClipCache::setCachedClip( |
+ const ClipAndTransform& clipAndTransform, |
+ const FloatClipRect& clip) { |
+ invalidateCacheIfNeeded(); |
+#if DCHECK_IS_ON() |
+ for (const auto& entry : m_clipCache) { |
+ if (entry.clipAndTransform == clipAndTransform) |
+ DCHECK(false); // There should be no existing entry. |
+ } |
+#endif |
+ m_clipCache.push_back(ClipCacheEntry(clipAndTransform, clip)); |
+} |
+ |
+} // namespace blink |