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b49de93b33
Allows for reference counting of images before disposal. This will allow multiple callers to hold a reference to an image and dispose of their reference without disposing the underlying image until all handles have been disposed. This will be used by the framework to help resolve some of the kludge I was trying to introduce in flutter/flutter#64582
67 lines
1.9 KiB
C++
67 lines
1.9 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/image.h"
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#include "flutter/lib/ui/painting/image_encoding.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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#include "third_party/tonic/dart_library_natives.h"
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namespace flutter {
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typedef CanvasImage Image;
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// Since _Image is a private class, we can't use IMPLEMENT_WRAPPERTYPEINFO
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static const tonic::DartWrapperInfo kDartWrapperInfo_ui_Image = {
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"ui",
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"_Image",
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sizeof(Image),
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};
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const tonic::DartWrapperInfo& Image::dart_wrapper_info_ =
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kDartWrapperInfo_ui_Image;
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#define FOR_EACH_BINDING(V) \
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V(Image, width) \
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V(Image, height) \
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V(Image, toByteData) \
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V(Image, dispose)
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FOR_EACH_BINDING(DART_NATIVE_CALLBACK)
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void CanvasImage::RegisterNatives(tonic::DartLibraryNatives* natives) {
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natives->Register({FOR_EACH_BINDING(DART_REGISTER_NATIVE)});
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}
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CanvasImage::CanvasImage() = default;
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CanvasImage::~CanvasImage() = default;
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Dart_Handle CanvasImage::toByteData(int format, Dart_Handle callback) {
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return EncodeImage(this, format, callback);
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}
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void CanvasImage::dispose() {
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auto hint_freed_delegate = UIDartState::Current()->GetHintFreedDelegate();
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if (hint_freed_delegate) {
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hint_freed_delegate->HintFreed(GetAllocationSize());
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}
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image_.reset();
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ClearDartWrapper();
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}
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size_t CanvasImage::GetAllocationSize() const {
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if (auto image = image_.get()) {
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const auto& info = image->imageInfo();
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const auto kMipmapOverhead = 4.0 / 3.0;
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const size_t image_byte_size = info.computeMinByteSize() * kMipmapOverhead;
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return image_byte_size + sizeof(this);
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} else {
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return sizeof(CanvasImage);
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}
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}
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} // namespace flutter
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