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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "gpu/command_buffer/service/shared_image/shared_memory_copy_strategy.h"
#include "gpu/command_buffer/service/shared_image/shared_image_backing.h"
#include "gpu/command_buffer/service/shared_image/shared_memory_image_backing.h"
namespace gpu {
SharedMemoryCopyStrategy::SharedMemoryCopyStrategy() = default;
SharedMemoryCopyStrategy::~SharedMemoryCopyStrategy() = default;
bool SharedMemoryCopyStrategy::CanCopy(SharedImageBacking* src_backing,
SharedImageBacking* dst_backing) {
bool src_is_shm =
src_backing->GetType() == SharedImageBackingType::kSharedMemory;
bool dst_is_shm =
dst_backing->GetType() == SharedImageBackingType::kSharedMemory;
// This strategy applies if one of the backings is shared memory, but not
// both.
if (src_is_shm == dst_is_shm) {
return false;
}
// TODO(crbug.com/434215964): We should also check if the non-shared-memory
// backing supports the required UploadFromMemory or ReadbackToMemory
// operation.
return src_backing->format() == dst_backing->format() &&
src_backing->size() == dst_backing->size();
}
bool SharedMemoryCopyStrategy::Copy(SharedImageBacking* src_backing,
SharedImageBacking* dst_backing) {
bool src_is_shm =
src_backing->GetType() == SharedImageBackingType::kSharedMemory;
if (src_is_shm) {
// Copy from Shared Memory to other backing.
auto* src_shm_backing = static_cast<SharedMemoryImageBacking*>(src_backing);
return dst_backing->UploadFromMemory(src_shm_backing->pixmaps());
} else {
// Copy from other backing to Shared Memory.
auto* dst_shm_backing = static_cast<SharedMemoryImageBacking*>(dst_backing);
return src_backing->ReadbackToMemory(dst_shm_backing->pixmaps());
}
}
} // namespace gpu
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