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// Copyright 2018 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 "services/viz/public/cpp/compositing/paint_filter_mojom_traits.h"
#include "cc/paint/paint_filter.h"
namespace mojo {
// static
base::Optional<std::vector<uint8_t>>
StructTraits<viz::mojom::PaintFilterDataView, sk_sp<cc::PaintFilter>>::data(
const sk_sp<cc::PaintFilter>& filter) {
std::vector<uint8_t> memory;
memory.resize(cc::PaintOpWriter::HeaderBytes() +
cc::PaintFilter::GetFilterSize(filter.get()));
// No need to populate the SerializeOptions here since the security
// constraints explicitly disable serializing images using the transfer cache
// and serialization of PaintRecords.
cc::PaintOp::SerializeOptions options(nullptr, nullptr, nullptr, nullptr,
nullptr, nullptr, false, false, 0,
SkMatrix::I());
cc::PaintOpWriter writer(memory.data(), memory.size(), options,
true /* enable_security_constraints */);
writer.Write(filter.get());
if (writer.size() == 0)
return base::nullopt;
memory.resize(writer.size());
return memory;
}
// static
bool StructTraits<viz::mojom::PaintFilterDataView, sk_sp<cc::PaintFilter>>::
Read(viz::mojom::PaintFilterDataView data, sk_sp<cc::PaintFilter>* out) {
base::Optional<std::vector<uint8_t>> buffer;
if (!data.ReadData(&buffer))
return false;
if (!buffer) {
// We may fail to serialize the filter if it doesn't fit in kBufferSize
// above, use an empty filter instead of rejecting the message.
*out = nullptr;
return true;
}
// We don't need to populate the DeserializeOptions here since the security
// constraints explicitly disable serializing images using the transfer
// cache/gpu::Mailbox and serialization of PaintRecords.
std::vector<uint8_t> scratch_buffer;
cc::PaintOp::DeserializeOptions options(nullptr, nullptr, nullptr,
&scratch_buffer, false, nullptr);
cc::PaintOpReader reader(buffer->data(), buffer->size(), options,
true /* enable_security_constraints */);
sk_sp<cc::PaintFilter> filter;
reader.Read(&filter);
if (!reader.valid()) {
*out = nullptr;
return false;
}
// We must have consumed all bytes writen when reading this filter.
if (reader.remaining_bytes() != 0u) {
*out = nullptr;
return false;
}
*out = std::move(filter);
return true;
}
} // namespace mojo
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