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// Copyright 2013 The Flutter 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 "flutter/lib/ui/painting/immutable_buffer.h"
#include <cstring>
#include "flutter/lib/ui/ui_dart_state.h"
#include "third_party/tonic/converter/dart_converter.h"
#include "third_party/tonic/dart_args.h"
#include "third_party/tonic/dart_binding_macros.h"
#if FML_OS_ANDROID
#include <sys/mman.h>
#endif
namespace flutter {
IMPLEMENT_WRAPPERTYPEINFO(ui, ImmutableBuffer);
#define FOR_EACH_BINDING(V) \
V(ImmutableBuffer, dispose) \
V(ImmutableBuffer, length)
FOR_EACH_BINDING(DART_NATIVE_CALLBACK)
ImmutableBuffer::~ImmutableBuffer() {}
void ImmutableBuffer::RegisterNatives(tonic::DartLibraryNatives* natives) {
natives->Register({{"ImmutableBuffer_init", ImmutableBuffer::init, 3, true},
FOR_EACH_BINDING(DART_REGISTER_NATIVE)});
}
void ImmutableBuffer::init(Dart_NativeArguments args) {
Dart_Handle callback_handle = Dart_GetNativeArgument(args, 2);
if (!Dart_IsClosure(callback_handle)) {
Dart_SetReturnValue(args, tonic::ToDart("Callback must be a function"));
return;
}
Dart_Handle buffer_handle = Dart_GetNativeArgument(args, 0);
tonic::Uint8List data = tonic::Uint8List(Dart_GetNativeArgument(args, 1));
auto sk_data = MakeSkDataWithCopy(data.data(), data.num_elements());
data.Release();
auto buffer = fml::MakeRefCounted<ImmutableBuffer>(sk_data);
buffer->AssociateWithDartWrapper(buffer_handle);
tonic::DartInvoke(callback_handle, {Dart_TypeVoid()});
}
size_t ImmutableBuffer::GetAllocationSize() const {
return sizeof(ImmutableBuffer) + data_->size();
}
#if FML_OS_ANDROID
// Compressed image buffers are allocated on the UI thread but are deleted on a
// decoder worker thread. Android's implementation of malloc appears to
// continue growing the native heap size when the allocating thread is
// different from the freeing thread. To work around this, create an SkData
// backed by an anonymous mapping.
sk_sp<SkData> ImmutableBuffer::MakeSkDataWithCopy(const void* data,
size_t length) {
if (length == 0) {
return SkData::MakeEmpty();
}
size_t mapping_length = length + sizeof(size_t);
void* mapping = ::mmap(nullptr, mapping_length, PROT_READ | PROT_WRITE,
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
if (mapping == MAP_FAILED) {
return SkData::MakeEmpty();
}
*reinterpret_cast<size_t*>(mapping) = mapping_length;
void* mapping_data = reinterpret_cast<char*>(mapping) + sizeof(size_t);
::memcpy(mapping_data, data, length);
SkData::ReleaseProc proc = [](const void* ptr, void* context) {
size_t* size_ptr = reinterpret_cast<size_t*>(context);
FML_DCHECK(ptr == size_ptr + 1);
if (::munmap(const_cast<void*>(context), *size_ptr) == -1) {
FML_LOG(ERROR) << "munmap of codec SkData failed";
}
};
return SkData::MakeWithProc(mapping_data, length, proc, mapping);
}
#else
sk_sp<SkData> ImmutableBuffer::MakeSkDataWithCopy(const void* data,
size_t length) {
return SkData::MakeWithCopy(data, length);
}
#endif // FML_OS_ANDROID
} // namespace flutter