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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
72 lines
2.6 KiB
C++
72 lines
2.6 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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#ifndef FLUTTER_LIB_UI_PAINTING_IMAGE_DECODER_H_
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#define FLUTTER_LIB_UI_PAINTING_IMAGE_DECODER_H_
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#include <memory>
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#include <optional>
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#include "flutter/common/task_runners.h"
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#include "flutter/flow/skia_gpu_object.h"
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#include "flutter/fml/concurrent_message_loop.h"
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#include "flutter/fml/macros.h"
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#include "flutter/fml/mapping.h"
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#include "flutter/fml/trace_event.h"
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#include "flutter/lib/ui/io_manager.h"
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#include "flutter/lib/ui/painting/image_descriptor.h"
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#include "third_party/skia/include/core/SkData.h"
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#include "third_party/skia/include/core/SkImage.h"
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#include "third_party/skia/include/core/SkImageInfo.h"
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#include "third_party/skia/include/core/SkRefCnt.h"
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#include "third_party/skia/include/core/SkSize.h"
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namespace flutter {
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// An object that coordinates image decompression and texture upload across
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// multiple threads/components in the shell. This object must be created,
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// accessed and collected on the UI thread (typically the engine or its runtime
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// controller). None of the expensive operations performed by this component
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// occur in a frame pipeline.
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class ImageDecoder {
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public:
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ImageDecoder(
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TaskRunners runners,
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std::shared_ptr<fml::ConcurrentTaskRunner> concurrent_task_runner,
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fml::WeakPtr<IOManager> io_manager);
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~ImageDecoder();
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using ImageResult = std::function<void(SkiaGPUObject<SkImage>)>;
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// Takes an image descriptor and returns a handle to a texture resident on the
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// GPU. All image decompression and resizes are done on a worker thread
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// concurrently. Texture upload is done on the IO thread and the result
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// returned back on the UI thread. On error, the texture is null but the
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// callback is guaranteed to return on the UI thread.
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void Decode(fml::RefPtr<ImageDescriptor> descriptor,
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uint32_t target_width,
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uint32_t target_height,
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const ImageResult& result);
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fml::WeakPtr<ImageDecoder> GetWeakPtr() const;
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private:
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TaskRunners runners_;
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std::shared_ptr<fml::ConcurrentTaskRunner> concurrent_task_runner_;
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fml::WeakPtr<IOManager> io_manager_;
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fml::WeakPtrFactory<ImageDecoder> weak_factory_;
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FML_DISALLOW_COPY_AND_ASSIGN(ImageDecoder);
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};
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sk_sp<SkImage> ImageFromCompressedData(fml::RefPtr<ImageDescriptor> descriptor,
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uint32_t target_width,
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uint32_t target_height,
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const fml::tracing::TraceFlow& flow);
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} // namespace flutter
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#endif // FLUTTER_LIB_UI_PAINTING_IMAGE_DECODER_H_
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