| // 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 "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() {} |
| |
| // 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_ |