third_party/WebKit/Source/core/imagebitmap/ImageBitmapFactories.h

/*
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#ifndef ImageBitmapFactories_h
#define ImageBitmapFactories_h

#include "bindings/core/v8/ScriptPromise.h"
#include "bindings/core/v8/ScriptPromiseResolver.h"
#include "bindings/core/v8/ScriptState.h"
#include "bindings/core/v8/UnionTypesCore.h"
#include "core/fileapi/FileReaderLoader.h"
#include "core/fileapi/FileReaderLoaderClient.h"
#include "core/imagebitmap/ImageBitmapOptions.h"
#include "platform/Supplementable.h"
#include "platform/geometry/IntRect.h"

namespace blink {

class Blob;
class EventTarget;
class ExceptionState;
class ExecutionContext;
class ImageBitmapSource;
class ImageBitmapOptions;
class ImageSource;
class WebTaskRunner;

typedef HTMLImageElementOrHTMLVideoElementOrHTMLCanvasElementOrBlobOrImageDataOrImageBitmap ImageBitmapSourceUnion;

class ImageBitmapFactories final : public NoBaseWillBeGarbageCollectedFinalized<ImageBitmapFactories>, public WillBeHeapSupplement<LocalDOMWindow>, public WillBeHeapSupplement<WorkerGlobalScope> {
    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(ImageBitmapFactories);
    USING_FAST_MALLOC_WILL_BE_REMOVED(ImageBitmapFactories);

public:
    static ScriptPromise createImageBitmap(ScriptState*, EventTarget&, const ImageBitmapSourceUnion&, ExceptionState&);
    static ScriptPromise createImageBitmap(ScriptState*, EventTarget&, const ImageBitmapSourceUnion&, const ImageBitmapOptions&, ExceptionState&);
    static ScriptPromise createImageBitmap(ScriptState*, EventTarget&, const ImageBitmapSourceUnion&, int sx, int sy, int sw, int sh, ExceptionState&);
    static ScriptPromise createImageBitmap(ScriptState*, EventTarget&, const ImageBitmapSourceUnion&, int sx, int sy, int sw, int sh, const ImageBitmapOptions&, ExceptionState&);
    static ScriptPromise createImageBitmap(ScriptState*, EventTarget&, ImageBitmapSource*, int sx, int sy, int sw, int sh, const ImageBitmapOptions&, ExceptionState&);

    virtual ~ImageBitmapFactories() { }

    DECLARE_TRACE();

protected:
    static const char* supplementName();

private:
    class ImageBitmapLoader final : public GarbageCollectedFinalized<ImageBitmapLoader>, public FileReaderLoaderClient {
    public:
        static ImageBitmapLoader* create(ImageBitmapFactories& factory, const IntRect& cropRect, const ImageBitmapOptions& options, ScriptState* scriptState)
        {
            return new ImageBitmapLoader(factory, cropRect, scriptState, options);
        }

        void loadBlobAsync(ExecutionContext*, Blob*);
        ScriptPromise promise() { return m_resolver->promise(); }

        DECLARE_TRACE();

        ~ImageBitmapLoader() override { }

    private:
        ImageBitmapLoader(ImageBitmapFactories&, const IntRect&, ScriptState*, const ImageBitmapOptions&);

        void rejectPromise();

        void scheduleAsyncImageBitmapDecoding();
        void decodeImageOnDecoderThread(WebTaskRunner*);
        void resolvePromiseOnOriginalThread(PassOwnPtr<ImageSource>);

        // FileReaderLoaderClient
        void didStartLoading() override { }
        void didReceiveData() override { }
        void didFinishLoading() override;
        void didFail(FileError::ErrorCode) override;

        FileReaderLoader m_loader;
        RawPtrWillBeMember<ImageBitmapFactories> m_factory;
        Member<ScriptPromiseResolver> m_resolver;
        IntRect m_cropRect;
        ImageBitmapOptions m_options;
    };

    static ImageBitmapFactories& from(EventTarget&);

    template<class GlobalObject>
    static ImageBitmapFactories& fromInternal(GlobalObject&);

    void addLoader(ImageBitmapLoader*);
    void didFinishLoading(ImageBitmapLoader*);

    PersistentHeapHashSetWillBeHeapHashSet<Member<ImageBitmapLoader>> m_pendingLoaders;
};

} // namespace blink

#endif // ImageBitmapFactories_h