SkJpegMetadataDecoderImpl Class Reference

Inheritance diagram for SkJpegMetadataDecoderImpl:

Public Member Functions
	SkJpegMetadataDecoderImpl (SkJpegMarkerList markerList)
sk_sp< SkData >	getExifMetadata (bool copyData) const override
sk_sp< SkData >	getICCProfileData (bool copyData) const override
bool	mightHaveGainmapImage () const override
bool	findGainmapImage (sk_sp< SkData > baseImageData, sk_sp< SkData > &outGainmapImageData, SkGainmapInfo &outGainmapInfo) override
Public Member Functions inherited from SkJpegMetadataDecoder
	SkJpegMetadataDecoder ()
virtual	~SkJpegMetadataDecoder ()
	SkJpegMetadataDecoder (const SkJpegMetadataDecoder &)=delete
SkJpegMetadataDecoder &	operator= (const SkJpegMetadataDecoder &)=delete

Additional Inherited Members
Static Public Member Functions inherited from SkJpegMetadataDecoder
static std::unique_ptr< SkJpegMetadataDecoder >	Make (std::vector< Segment > headerSegments)

Detailed Description

Definition at line 1318 of file SkJpegCodec.cpp.

Constructor & Destructor Documentation

SkJpegMetadataDecoderImpl()

SkJpegMetadataDecoderImpl::SkJpegMetadataDecoderImpl ( SkJpegMarkerList  markerList )

inline

Definition at line 1320 of file SkJpegCodec.cpp.

: fMarkerList(std::move(markerList)) {}

Member Function Documentation

findGainmapImage()

bool SkJpegMetadataDecoderImpl::findGainmapImage ( sk_sp< SkData >  baseImageData, sk_sp< SkData > &  outGainmapImagedata, SkGainmapInfo &  outGainmapInfo  )

inlineoverridevirtual

Given a JPEG encoded image |baseImageData|, return in |outGainmapImageData| the JPEG encoded gainmap image and return in |outGainmapInfo| its gainmap rendering parameters. Return true if both output variables were successfully populated, otherwise return false.

Implements SkJpegMetadataDecoder.

Definition at line 1351 of file SkJpegCodec.cpp.

                                                                  {
#ifdef SK_CODEC_DECODES_JPEG_GAINMAPS
        auto baseImageStream = SkMemoryStream::Make(baseImageData);
        auto sourceMgr = SkJpegSourceMgr::Make(baseImageStream.get());
        SkGainmapInfo gainmapInfo;
        std::unique_ptr<SkStream> gainmapImageStream;
        if (!get_gainmap_info(fMarkerList, sourceMgr.get(), &gainmapInfo, &gainmapImageStream)) {
            return false;
        }
 
        // TODO(https://crbug.com/1404000): The function |get_gainmap_info| will always return an
        // SkStream that is backed by an SkData. Change it to return that SkData, to avoid this
        // re-extraction of the SkData.
        SkASSERT(gainmapImageStream->getMemoryBase());
        outGainmapImageData = SkData::MakeWithCopy(gainmapImageStream->getMemoryBase(),
                                                   gainmapImageStream->getLength());
        outGainmapInfo = gainmapInfo;
        return true;
#else
        return false;
#endif
    }

getExifMetadata()

sk_sp< SkData > SkJpegMetadataDecoderImpl::getExifMetadata ( bool  copyData ) const

inlineoverridevirtual

Return the Exif data attached to the image (if any) and nullptr otherwise. If |copyData| is false, then the returned SkData may directly reference the data provided when this object was created.

Implements SkJpegMetadataDecoder.

Definition at line 1322 of file SkJpegCodec.cpp.

                                                                {
        return read_metadata(fMarkerList,
                             kExifMarker,
                             kExifSig,
                             sizeof(kExifSig),
                             /*signaturePadding=*/1,
                             /*bytesInIndex=*/0,
                             copyData);
    }

getICCProfileData()

sk_sp< SkData > SkJpegMetadataDecoderImpl::getICCProfileData ( bool  copyData ) const

inlineoverridevirtual

Return the ICC profile of the image if any, and nullptr otherwise. If |copyData| is false, then the returned SkData may directly reference the data provided when this object was created.

Implements SkJpegMetadataDecoder.

Definition at line 1332 of file SkJpegCodec.cpp.

                                                                  {
        return read_metadata(fMarkerList,
                             kICCMarker,
                             kICCSig,
                             sizeof(kICCSig),
                             /*signaturePadding=*/0,
                             kICCMarkerIndexSize,
                             copyData);
    }

mightHaveGainmapImage()

bool SkJpegMetadataDecoderImpl::mightHaveGainmapImage ( ) const

inlineoverridevirtual

Return true if there is a possibility that this image contains a gainmap image.

Implements SkJpegMetadataDecoder.

Definition at line 1342 of file SkJpegCodec.cpp.

                                                {
#ifdef SK_CODEC_DECODES_JPEG_GAINMAPS
        // All supported gainmap formats require MPF. Reject images that do not have MPF.
        return find_mp_params(fMarkerList, nullptr, nullptr) != nullptr;
#else
        return false;
#endif
    }

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The documentation for this class was generated from the following file:

• third_party/skia/src/codec/SkJpegCodec.cpp