Source/WebCore/platform/graphics/ImageSource.h

/*
 * Copyright (C) 2016-2021 Apple Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
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#pragma once

#include "ImageFrame.h"

#include <wtf/Forward.h>
#include <wtf/RunLoop.h>
#include <wtf/SynchronizedFixedQueue.h>
#include <wtf/WeakPtr.h>
#include <wtf/WorkQueue.h>
#include <wtf/text/TextStream.h>

namespace WebCore {

class BitmapImage;
class GraphicsContext;
class ImageDecoder;
class FragmentedSharedBuffer;

class ImageSource : public ThreadSafeRefCounted<ImageSource>, public CanMakeWeakPtr<ImageSource> {
    friend class BitmapImage;
public:
    ~ImageSource();

    static Ref<ImageSource> create(BitmapImage* image, AlphaOption alphaOption = AlphaOption::Premultiplied, GammaAndColorProfileOption gammaAndColorProfileOption = GammaAndColorProfileOption::Applied)
    {
        return adoptRef(*new ImageSource(image, alphaOption, gammaAndColorProfileOption));
    }

    static Ref<ImageSource> create(Ref<NativeImage>&& nativeImage)
    {
        return adoptRef(*new ImageSource(WTFMove(nativeImage)));
    }

    void setData(FragmentedSharedBuffer* data, bool allDataReceived);
    void resetData(FragmentedSharedBuffer* data);
    EncodedDataStatus dataChanged(FragmentedSharedBuffer* data, bool allDataReceived);
    bool isAllDataReceived();

    unsigned decodedSize() const { return m_decodedSize; }
    void destroyDecodedData(size_t begin, size_t end);
    void destroyIncompleteDecodedData();
    void clearFrameBufferCache(size_t beforeFrame);

    void growFrames();
    void clearMetadata();
    void clearImage() { m_image = nullptr; }
    URL sourceURL() const;
    String mimeType() const;
    long long expectedContentLength() const;

    // Asynchronous image decoding
    bool canUseAsyncDecoding();
    void startAsyncDecodingQueue();
    void requestFrameAsyncDecodingAtIndex(size_t, SubsamplingLevel, const std::optional<IntSize>& = { });
    void stopAsyncDecodingQueue();
    bool hasAsyncDecodingQueue() const { return m_decodingQueue; }
    bool isAsyncDecodingQueueIdle() const;
    void setFrameDecodingDurationForTesting(Seconds duration) { m_frameDecodingDurationForTesting = duration; }
    Seconds frameDecodingDurationForTesting() const { return m_frameDecodingDurationForTesting; }

    // Image metadata which is calculated either by the ImageDecoder or directly
    // from the NativeImage if this class was created for a memory image.
    EncodedDataStatus encodedDataStatus();
    bool isSizeAvailable() { return encodedDataStatus() >= EncodedDataStatus::SizeAvailable; }
    WEBCORE_EXPORT size_t frameCount();
    RepetitionCount repetitionCount();
    String uti();
    String filenameExtension();
    String accessibilityDescription();
    std::optional<IntPoint> hotSpot();
    std::optional<IntSize> densityCorrectedSize(ImageOrientation = ImageOrientation::FromImage);
    bool hasDensityCorrectedSize() { return densityCorrectedSize().has_value(); }

    ImageOrientation orientation();

    // Image metadata which is calculated from the first ImageFrame.
    WEBCORE_EXPORT IntSize size(ImageOrientation = ImageOrientation::FromImage);
    IntSize sourceSize(ImageOrientation = ImageOrientation::FromImage);
    IntSize sizeRespectingOrientation();
    Color singlePixelSolidColor();
    SubsamplingLevel maximumSubsamplingLevel();

    // ImageFrame metadata which does not require caching the ImageFrame.
    bool frameIsBeingDecodedAndIsCompatibleWithOptionsAtIndex(size_t, const DecodingOptions&);
    DecodingStatus frameDecodingStatusAtIndex(size_t);
    bool frameHasAlphaAtIndex(size_t);
    bool frameHasImageAtIndex(size_t);
    bool frameHasFullSizeNativeImageAtIndex(size_t, const std::optional<SubsamplingLevel>&);
    bool frameHasDecodedNativeImageCompatibleWithOptionsAtIndex(size_t, const std::optional<SubsamplingLevel>&, const DecodingOptions&);
    SubsamplingLevel frameSubsamplingLevelAtIndex(size_t);

    // ImageFrame metadata which forces caching or re-caching the ImageFrame.
    IntSize frameSizeAtIndex(size_t, SubsamplingLevel = SubsamplingLevel::Default);
    unsigned frameBytesAtIndex(size_t, SubsamplingLevel = SubsamplingLevel::Default);
    WEBCORE_EXPORT Seconds frameDurationAtIndex(size_t);
    ImageOrientation frameOrientationAtIndex(size_t);

    RefPtr<NativeImage> createFrameImageAtIndex(size_t, SubsamplingLevel = SubsamplingLevel::Default);
    RefPtr<NativeImage> frameImageAtIndex(size_t);
    RefPtr<NativeImage> frameImageAtIndexCacheIfNeeded(size_t, SubsamplingLevel = SubsamplingLevel::Default);

private:
    ImageSource(BitmapImage*, AlphaOption = AlphaOption::Premultiplied, GammaAndColorProfileOption = GammaAndColorProfileOption::Applied);
    ImageSource(Ref<NativeImage>&&);

    enum class MetadataType {
        AccessibilityDescription    = 1 << 0,
        DensityCorrectedSize        = 1 << 1,
        EncodedDataStatus           = 1 << 2,
        FileNameExtension           = 1 << 3,
        FrameCount                  = 1 << 4,
        HotSpot                     = 1 << 5,
        MaximumSubsamplingLevel     = 1 << 6,
        Orientation                 = 1 << 7,
        RepetitionCount             = 1 << 8,
        SinglePixelSolidColor       = 1 << 9,
        Size                        = 1 << 10,
        UTI                         = 1 << 11
    };

    template<typename T>
    T metadataCacheIfNeeded(T& cachedValue, const T& defaultValue, MetadataType, T (ImageDecoder::*functor)() const);

    template<typename T>
    T firstFrameMetadataCacheIfNeeded(T& cachedValue, MetadataType, T (ImageFrame::*functor)() const, ImageFrame::Caching, const std::optional<SubsamplingLevel>& = { });

    bool ensureDecoderAvailable(FragmentedSharedBuffer* data);
    bool isDecoderAvailable() const { return m_decoder; }
    void decodedSizeChanged(long long decodedSize);
    void didDecodeProperties(unsigned decodedPropertiesSize);
    void decodedSizeIncreased(unsigned decodedSize);
    void decodedSizeDecreased(unsigned decodedSize);
    void decodedSizeReset(unsigned decodedSize);
    void encodedDataStatusChanged(EncodedDataStatus);

    void setNativeImage(Ref<NativeImage>&&);
    void cacheMetadataAtIndex(size_t, SubsamplingLevel, DecodingStatus = DecodingStatus::Invalid);
    void cachePlatformImageAtIndex(PlatformImagePtr&&, size_t, SubsamplingLevel, const DecodingOptions&, DecodingStatus = DecodingStatus::Invalid);
    void cachePlatformImageAtIndexAsync(PlatformImagePtr&&, size_t, SubsamplingLevel, const DecodingOptions&, DecodingStatus);

    struct ImageFrameRequest;
    static const int BufferSize = 8;
    WorkQueue& decodingQueue();
    SynchronizedFixedQueue<ImageFrameRequest, BufferSize>& frameRequestQueue();

    const ImageFrame& frameAtIndex(size_t index) { return index < m_frames.size() ? m_frames[index] : ImageFrame::defaultFrame(); }
    const ImageFrame& frameAtIndexCacheIfNeeded(size_t, ImageFrame::Caching, const std::optional<SubsamplingLevel>& = { });

    void dump(TextStream&);

    BitmapImage* m_image { nullptr };
    RefPtr<ImageDecoder> m_decoder;
    AlphaOption m_alphaOption { AlphaOption::Premultiplied };
    GammaAndColorProfileOption m_gammaAndColorProfileOption { GammaAndColorProfileOption::Applied };

    unsigned m_decodedSize { 0 };
    unsigned m_decodedPropertiesSize { 0 };
    Vector<ImageFrame, 1> m_frames;

    // Asynchronous image decoding.
    struct ImageFrameRequest {
        size_t index;
        SubsamplingLevel subsamplingLevel;
        DecodingOptions decodingOptions;
        DecodingStatus decodingStatus;
        bool operator==(const ImageFrameRequest& other) const
        {
            return index == other.index && subsamplingLevel == other.subsamplingLevel && decodingOptions == other.decodingOptions && decodingStatus == other.decodingStatus;
        }
    };
    using FrameRequestQueue = SynchronizedFixedQueue<ImageFrameRequest, BufferSize>;
    using FrameCommitQueue = Deque<ImageFrameRequest, BufferSize>;
    RefPtr<FrameRequestQueue> m_frameRequestQueue;
    FrameCommitQueue m_frameCommitQueue;
    RefPtr<WorkQueue> m_decodingQueue;
    Seconds m_frameDecodingDurationForTesting;

    // Image metadata.
    EncodedDataStatus m_encodedDataStatus { EncodedDataStatus::Unknown };
    size_t m_frameCount { 0 };
    RepetitionCount m_repetitionCount { RepetitionCountNone };
    String m_uti;
    String m_filenameExtension;
    String m_accessibilityDescription;
    std::optional<IntPoint> m_hotSpot;

    // Image metadata which is calculated from the first ImageFrame.
    IntSize m_size;
    std::optional<IntSize> m_densityCorrectedSize;
    ImageOrientation m_orientation;
    Color m_singlePixelSolidColor;
    SubsamplingLevel m_maximumSubsamplingLevel { SubsamplingLevel::Default };

    OptionSet<MetadataType> m_cachedMetadata;

    RunLoop& m_runLoop;
};

}