blob: 59b1ca645e24e33d6f9b12b799d93477055c45db [file] [log] [blame]
// 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.
#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.
class CC_PAINT_EXPORT TransferCacheDeserializeHelper {
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_; }
virtual ServiceTransferCacheEntry* GetEntryInternal(
TransferCacheEntryType entry_type,
uint32_t entry_id) = 0;
size_t total_size_ = 0;
} // namespace cc