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452e630ee2
The raw pointer isn't a reliable id as the allocator can reuse an address that's just been released for another layer. This will fix Fuchsia bug FL-216. This problem was not affecting non-Fuchsia Flutter probably because non-Fuchsia Flutter purges the raster cache key much more frequently so we won't see a key collision. In Fuchsia, as the key has to wait for the Vulkan surface to render asynchronously, this suddenly becomes an issue.
65 lines
1.8 KiB
C++
65 lines
1.8 KiB
C++
// Copyright 2013 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef FLUTTER_FLOW_RASTER_CACHE_KEY_H_
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#define FLUTTER_FLOW_RASTER_CACHE_KEY_H_
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#include <unordered_map>
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#include "flutter/flow/matrix_decomposition.h"
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#include "flutter/fml/logging.h"
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namespace flutter {
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template <typename ID>
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class RasterCacheKey {
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public:
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RasterCacheKey(ID id, const SkMatrix& ctm) : id_(id), matrix_(ctm) {
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matrix_[SkMatrix::kMTransX] = SkScalarFraction(ctm.getTranslateX());
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matrix_[SkMatrix::kMTransY] = SkScalarFraction(ctm.getTranslateY());
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#ifndef SUPPORT_FRACTIONAL_TRANSLATION
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FML_DCHECK(matrix_.getTranslateX() == 0 && matrix_.getTranslateY() == 0);
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#endif
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}
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ID id() const { return id_; }
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const SkMatrix& matrix() const { return matrix_; }
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struct Hash {
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uint32_t operator()(RasterCacheKey const& key) const {
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return std::hash<ID>()(key.id_);
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}
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};
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struct Equal {
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constexpr bool operator()(const RasterCacheKey& lhs,
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const RasterCacheKey& rhs) const {
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return lhs.id_ == rhs.id_ && lhs.matrix_ == rhs.matrix_;
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}
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};
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template <class Value>
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using Map = std::unordered_map<RasterCacheKey, Value, Hash, Equal>;
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private:
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ID id_;
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// ctm where only fractional (0-1) translations are preserved:
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// matrix_ = ctm;
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// matrix_[SkMatrix::kMTransX] = SkScalarFraction(ctm.getTranslateX());
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// matrix_[SkMatrix::kMTransY] = SkScalarFraction(ctm.getTranslateY());
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SkMatrix matrix_;
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};
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// The ID is the uint32_t picture uniqueID
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using PictureRasterCacheKey = RasterCacheKey<uint32_t>;
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class Layer;
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// The ID is the uint64_t layer unique_id
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using LayerRasterCacheKey = RasterCacheKey<uint64_t>;
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} // namespace flutter
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#endif // FLUTTER_FLOW_RASTER_CACHE_KEY_H_
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