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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef FLUTTER_FLOW_RASTER_CACHE_KEY_H_
#define FLUTTER_FLOW_RASTER_CACHE_KEY_H_
#include <unordered_map>
#include "flutter/flow/matrix_decomposition.h"
#include "flutter/fml/logging.h"
namespace flutter {
template <typename ID>
class RasterCacheKey {
public:
RasterCacheKey(ID id, const SkMatrix& ctm) : id_(id), matrix_(ctm) {
matrix_[SkMatrix::kMTransX] = SkScalarFraction(ctm.getTranslateX());
matrix_[SkMatrix::kMTransY] = SkScalarFraction(ctm.getTranslateY());
#ifndef SUPPORT_FRACTIONAL_TRANSLATION
FML_DCHECK(matrix_.getTranslateX() == 0 && matrix_.getTranslateY() == 0);
#endif
}
ID id() const { return id_; }
const SkMatrix& matrix() const { return matrix_; }
struct Hash {
uint32_t operator()(RasterCacheKey const& key) const {
return std::hash<ID>()(key.id_);
}
};
struct Equal {
constexpr bool operator()(const RasterCacheKey& lhs,
const RasterCacheKey& rhs) const {
return lhs.id_ == rhs.id_ && lhs.matrix_ == rhs.matrix_;
}
};
template <class Value>
using Map = std::unordered_map<RasterCacheKey, Value, Hash, Equal>;
private:
ID id_;
// ctm where only fractional (0-1) translations are preserved:
// matrix_ = ctm;
// matrix_[SkMatrix::kMTransX] = SkScalarFraction(ctm.getTranslateX());
// matrix_[SkMatrix::kMTransY] = SkScalarFraction(ctm.getTranslateY());
SkMatrix matrix_;
};
// The ID is the uint32_t picture uniqueID
using PictureRasterCacheKey = RasterCacheKey<uint32_t>;
class Layer;
// The ID is the uint64_t layer unique_id
using LayerRasterCacheKey = RasterCacheKey<uint64_t>;
} // namespace flutter
#endif // FLUTTER_FLOW_RASTER_CACHE_KEY_H_