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5281322421
Refactors instantiateImageCodec and decodeImageFromPixels to provide intermediate data about the image width, height, and bytes per pixel. This allows for more fine grained control from Dart, particularly when trying to reason about how or whether to maintain aspect ratio in the targetWidth/targetHeight parameters. This leaves the existing methods functional by re-implementing them to use the new ImmutableBuffer/ImageDescriptor class. The ImmutableBuffer class is provided so that callers can avoid copying the image data multiple times if they wish to re-recreate the image descriptor. Related Issues
100 lines
3.2 KiB
C++
100 lines
3.2 KiB
C++
// Copyright 2013 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "flutter/lib/ui/painting/immutable_buffer.h"
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#include "flutter/lib/ui/ui_dart_state.h"
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#include "third_party/tonic/converter/dart_converter.h"
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#include "third_party/tonic/dart_args.h"
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#include "third_party/tonic/dart_binding_macros.h"
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#if OS_ANDROID
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#include <sys/mman.h>
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#endif
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namespace flutter {
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IMPLEMENT_WRAPPERTYPEINFO(ui, ImmutableBuffer);
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#define FOR_EACH_BINDING(V) \
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V(ImmutableBuffer, dispose) \
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V(ImmutableBuffer, length)
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FOR_EACH_BINDING(DART_NATIVE_CALLBACK)
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ImmutableBuffer::~ImmutableBuffer() {}
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void ImmutableBuffer::RegisterNatives(tonic::DartLibraryNatives* natives) {
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natives->Register({{"ImmutableBuffer_init", ImmutableBuffer::init, 3, true},
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FOR_EACH_BINDING(DART_REGISTER_NATIVE)});
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}
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void ImmutableBuffer::init(Dart_NativeArguments args) {
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Dart_Handle callback_handle = Dart_GetNativeArgument(args, 2);
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if (!Dart_IsClosure(callback_handle)) {
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Dart_SetReturnValue(args, tonic::ToDart("Callback must be a function"));
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return;
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}
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Dart_Handle buffer_handle = Dart_GetNativeArgument(args, 0);
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tonic::Uint8List data = tonic::Uint8List(Dart_GetNativeArgument(args, 1));
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auto sk_data = MakeSkDataWithCopy(data.data(), data.num_elements());
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data.Release();
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auto buffer = fml::MakeRefCounted<ImmutableBuffer>(sk_data);
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buffer->AssociateWithDartWrapper(buffer_handle);
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tonic::DartInvoke(callback_handle, {Dart_TypeVoid()});
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}
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size_t ImmutableBuffer::GetAllocationSize() const {
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return sizeof(ImmutableBuffer) + data_->size();
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}
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#if OS_ANDROID
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// Compressed image buffers are allocated on the UI thread but are deleted on a
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// decoder worker thread. Android's implementation of malloc appears to
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// continue growing the native heap size when the allocating thread is
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// different from the freeing thread. To work around this, create an SkData
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// backed by an anonymous mapping.
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sk_sp<SkData> ImmutableBuffer::MakeSkDataWithCopy(const void* data,
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size_t length) {
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if (length == 0) {
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return SkData::MakeEmpty();
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}
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size_t mapping_length = length + sizeof(size_t);
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void* mapping = ::mmap(nullptr, mapping_length, PROT_READ | PROT_WRITE,
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MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
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if (mapping == MAP_FAILED) {
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return SkData::MakeEmpty();
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}
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*reinterpret_cast<size_t*>(mapping) = mapping_length;
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void* mapping_data = reinterpret_cast<char*>(mapping) + sizeof(size_t);
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::memcpy(mapping_data, data, length);
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SkData::ReleaseProc proc = [](const void* ptr, void* context) {
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size_t* size_ptr = reinterpret_cast<size_t*>(context);
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FML_DCHECK(ptr == size_ptr + 1);
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if (::munmap(const_cast<void*>(context), *size_ptr) == -1) {
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FML_LOG(ERROR) << "munmap of codec SkData failed";
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}
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};
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return SkData::MakeWithProc(mapping_data, length, proc, mapping);
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}
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#else
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sk_sp<SkData> ImmutableBuffer::MakeSkDataWithCopy(const void* data,
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size_t length) {
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return SkData::MakeWithCopy(data, length);
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}
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#endif // OS_ANDROID
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} // namespace flutter
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