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Side by Side Diff: third_party/WebKit/Source/platform/graphics/paint/GeometryMapperTransformCache.cpp

Issue 2729243002: Improve performance of GeometryMapper cache. (Closed)
Patch Set: none Created 3 years, 9 months ago
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1 // Copyright 2017 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 "platform/graphics/paint/GeometryMapperTransformCache.h"
6
7 namespace blink {
8
9 // All transform caches invalidate themselves by tracking a local cache
10 // generation, and invalidating their cache if their cache generation disagrees
11 // with s_transformCacheGeneration.
12 static unsigned s_transformCacheGeneration = 0;
13
14 GeometryMapperTransformCache::GeometryMapperTransformCache()
15 : m_cacheGeneration(s_transformCacheGeneration) {}
16
17 void GeometryMapperTransformCache::clearCache() {
18 s_transformCacheGeneration++;
19 }
20
21 void GeometryMapperTransformCache::invalidateCacheIfNeeded() {
22 if (m_cacheGeneration != s_transformCacheGeneration) {
23 m_transformCache.clear();
24 m_cacheGeneration = s_transformCacheGeneration;
25 }
26 }
27
28 const TransformationMatrix* GeometryMapperTransformCache::getCachedTransform(
29 const TransformPaintPropertyNode* ancestorTransform) {
30 invalidateCacheIfNeeded();
31 for (const auto& entry : m_transformCache) {
32 if (entry.ancestorNode == ancestorTransform) {
33 return &entry.toAncestor;
34 }
35 }
36 return nullptr;
37 }
38
39 void GeometryMapperTransformCache::setCachedTransform(
40 const TransformPaintPropertyNode* ancestorTransform,
41 const TransformationMatrix& matrix) {
42 invalidateCacheIfNeeded();
43 #if DCHECK_IS_ON()
44 for (const auto& entry : m_transformCache) {
45 if (entry.ancestorNode == ancestorTransform)
46 DCHECK(false); // There should be no existing entry.
47 }
48 #endif
49 m_transformCache.push_back(TransformCacheEntry(ancestorTransform, matrix));
50 }
51
52 } // namespace blink
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