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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/cpu_readback_upload_copy_strategy.h"
#include "gpu/command_buffer/service/shared_image/shared_image_backing.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "third_party/skia/include/core/SkPixmap.h"
namespace gpu {
CPUReadbackUploadCopyStrategy::CPUReadbackUploadCopyStrategy() = default;
CPUReadbackUploadCopyStrategy::~CPUReadbackUploadCopyStrategy() = default;
bool CPUReadbackUploadCopyStrategy::CanCopy(SharedImageBacking* src_backing,
SharedImageBacking* dst_backing) {
// TODO(crbug.com/434215964): Add IsSupportedReadbackToMemory() and
// IsSupportedUploadFromMemory() as virtual method to SharedImageBacking
// and use it here to determine if this strategy can be supported or not.
return src_backing->format() == dst_backing->format() &&
src_backing->size() == dst_backing->size();
}
bool CPUReadbackUploadCopyStrategy::Copy(SharedImageBacking* src_backing,
SharedImageBacking* dst_backing) {
std::vector<SkBitmap> bitmaps;
for (int i = 0; i < src_backing->format().NumberOfPlanes(); ++i) {
SkImageInfo info = src_backing->AsSkImageInfo(i);
SkBitmap bitmap;
if (!bitmap.tryAllocPixels(info)) {
return false;
}
bitmaps.push_back(bitmap);
}
std::vector<SkPixmap> pixmaps;
for (const auto& bitmap : bitmaps) {
pixmaps.push_back(bitmap.pixmap());
}
if (!src_backing->ReadbackToMemory(pixmaps)) {
return false;
}
if (!dst_backing->UploadFromMemory(pixmaps)) {
return false;
}
return true;
}
} // namespace gpu
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