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- // Copyright (c) 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.
- #ifndef CC_PAINT_TRANSFER_CACHE_DESERIALIZE_HELPER_H_
- #define CC_PAINT_TRANSFER_CACHE_DESERIALIZE_HELPER_H_
- #include <cstdint>
- #include <memory>
- #include "cc/paint/paint_export.h"
- #include "cc/paint/transfer_cache_entry.h"
- namespace cc {
- // Helper interface consumed by cc/paint during OOP raster deserialization.
- // Provides access to the transfer cache.
- // TODO(ericrk): We should use TransferCacheEntryId, not uint64_t here, but
- // we need to figure out layering. crbug.com/777622
- class CC_PAINT_EXPORT TransferCacheDeserializeHelper {
- public:
- virtual ~TransferCacheDeserializeHelper() = default;
- // Type safe access to an entry in the transfer cache. Returns null if the
- // entry is missing or of the wrong type.
- template <typename T>
- T* GetEntryAs(uint32_t id) {
- // There is a bit of a weirdness if we use T::kType directly in the DCHECK
- // below. Specifically, the linker can't seem to find that symbol ¯\_(ツ)_/¯
- // so instead save off the type into a local variable and use that.
- auto entry_type = T::kType;
- ServiceTransferCacheEntry* entry = GetEntryInternal(entry_type, id);
- if (entry == nullptr) {
- return nullptr;
- }
- total_size_ += entry->CachedSize();
- // The service side entry is created using T::kType, so the class created is
- // guaranteed to make the entry type.
- DCHECK_EQ(entry->Type(), entry_type);
- return static_cast<T*>(entry);
- }
- // Creates an entry directly. If an entry exists, it will be clobbered.
- virtual void CreateLocalEntry(
- uint32_t id,
- std::unique_ptr<ServiceTransferCacheEntry> entry) = 0;
- size_t GetTotalEntrySizes() const { return total_size_; }
- private:
- virtual ServiceTransferCacheEntry* GetEntryInternal(
- TransferCacheEntryType entry_type,
- uint32_t entry_id) = 0;
- size_t total_size_ = 0;
- };
- } // namespace cc
- #endif // CC_PAINT_TRANSFER_CACHE_DESERIALIZE_HELPER_H_
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