type FormatError … func (e FormatError) Error() string { … } type UnsupportedError … func (e UnsupportedError) Error() string { … } var errUnsupportedSubsamplingRatio … type component … const dcTable … const acTable … const maxTc … const maxTh … const maxTq … const maxComponents … const sof0Marker … const sof1Marker … const sof2Marker … const dhtMarker … const rst0Marker … const rst7Marker … const soiMarker … const eoiMarker … const sosMarker … const dqtMarker … const driMarker … const comMarker … const app0Marker … const app14Marker … const app15Marker … const adobeTransformUnknown … const adobeTransformYCbCr … const adobeTransformYCbCrK … var unzig … type Reader … type bits … type decoder … // fill fills up the d.bytes.buf buffer from the underlying io.Reader. It // should only be called when there are no unread bytes in d.bytes. func (d *decoder) fill() error { … } // unreadByteStuffedByte undoes the most recent readByteStuffedByte call, // giving a byte of data back from d.bits to d.bytes. The Huffman look-up table // requires at least 8 bits for look-up, which means that Huffman decoding can // sometimes overshoot and read one or two too many bytes. Two-byte overshoot // can happen when expecting to read a 0xff 0x00 byte-stuffed byte. func (d *decoder) unreadByteStuffedByte() { … } // readByte returns the next byte, whether buffered or not buffered. It does // not care about byte stuffing. func (d *decoder) readByte() (x byte, err error) { … } var errMissingFF00 … // readByteStuffedByte is like readByte but is for byte-stuffed Huffman data. func (d *decoder) readByteStuffedByte() (x byte, err error) { … } // readFull reads exactly len(p) bytes into p. It does not care about byte // stuffing. func (d *decoder) readFull(p []byte) error { … } // ignore ignores the next n bytes. func (d *decoder) ignore(n int) error { … } // Specified in section B.2.2. func (d *decoder) processSOF(n int) error { … } // Specified in section B.2.4.1. func (d *decoder) processDQT(n int) error { … } // Specified in section B.2.4.4. func (d *decoder) processDRI(n int) error { … } func (d *decoder) processApp0Marker(n int) error { … } func (d *decoder) processApp14Marker(n int) error { … } // decode reads a JPEG image from r and returns it as an image.Image. func (d *decoder) decode(r io.Reader, configOnly bool) (image.Image, error) { … } // applyBlack combines d.img3 and d.blackPix into a CMYK image. The formula // used depends on whether the JPEG image is stored as CMYK or YCbCrK, // indicated by the APP14 (Adobe) metadata. // // Adobe CMYK JPEG images are inverted, where 255 means no ink instead of full // ink, so we apply "v = 255 - v" at various points. Note that a double // inversion is a no-op, so inversions might be implicit in the code below. func (d *decoder) applyBlack() (image.Image, error) { … } func (d *decoder) isRGB() bool { … } func (d *decoder) convertToRGB() (image.Image, error) { … } // Decode reads a JPEG image from r and returns it as an [image.Image]. func Decode(r io.Reader) (image.Image, error) { … } // DecodeConfig returns the color model and dimensions of a JPEG image without // decoding the entire image. func DecodeConfig(r io.Reader) (image.Config, error) { … } func init() { … }
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