| Метод | Описание | |
|---|---|---|
| DiscardedByteCount ( ) : int | ||
| NextRestartNumber ( ) : int | ||
| SawSOF ( ) : bool | ||
| SawSOI ( ) : bool | ||
| SkipBytes ( int count ) : void | ||
| jpeg_marker_reader ( jpeg_decompress_struct cinfo ) : System |
Initialize the marker reader module. This is called only once, when the decompression object is created.
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| jpeg_save_markers ( int marker_code, int length_limit ) : void | ||
| jpeg_set_marker_processor ( int marker_code, jpeg_decompress_struct routine ) : void |
Install a special processing method for COM or APPn markers.
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| next_marker ( ) : bool |
Find the next JPEG marker, save it in cinfo.unread_marker. Returns false if had to suspend before reaching a marker; in that case cinfo.unread_marker is unchanged. Note that the result might not be a valid marker code, but it will never be 0 or FF.
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| read_markers ( ) : ReadResult |
Read markers until SOS or EOI. Returns same codes as are defined for jpeg_consume_input: JPEG_SUSPENDED, JPEG_REACHED_SOS, or JPEG_REACHED_EOI. Note: This function may return a pseudo SOS marker(with zero component number) for treat by input controller's consume_input. consume_input itself should filter out (skip) the pseudo marker after processing for the caller.
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| read_restart_marker ( ) : bool |
Read a restart marker, which is expected to appear next in the datastream; if the marker is not there, take appropriate recovery action. Returns false if suspension is required. Made public for use by entropy decoder only This is called by the entropy decoder after it has read an appropriate number of MCUs. cinfo.unread_marker may be nonzero if the entropy decoder has already read a marker from the data source. Under normal conditions cinfo.unread_marker will be reset to 0 before returning; if not reset, it holds a marker which the decoder will be unable to read past.
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| reset_marker_reader ( ) : void |
Reset marker processing state to begin a fresh datastream.
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| Метод | Описание | |
|---|---|---|
| examine_app0 ( jpeg_decompress_struct cinfo, byte data, int datalen, int remaining ) : void |
Examine first few bytes from an APP0. Take appropriate action if it is a JFIF marker. datalen is # of bytes at data[], remaining is length of rest of marker data.
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| examine_app14 ( jpeg_decompress_struct cinfo, byte data, int datalen, int remaining ) : void |
Examine first few bytes from an APP14. Take appropriate action if it is an Adobe marker. datalen is # of bytes at data[], remaining is length of rest of marker data.
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| first_marker ( ) : bool |
Like next_marker, but used to obtain the initial SOI marker. For this marker, we do not allow preceding garbage or fill; otherwise, we might well scan an entire input file before realizing it ain't JPEG. If an application wants to process non-JFIF files, it must seek to the SOI before calling the JPEG library.
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| get_dac ( ) : bool |
Process a DAC marker
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| get_dht ( ) : bool |
Process a DHT marker
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| get_dqt ( ) : bool |
Process a DQT marker
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| get_dri ( ) : bool |
Process a DRI marker
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| get_interesting_appn ( jpeg_decompress_struct cinfo ) : bool |
Process an APP0 or APP14 marker without saving it
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| get_lse ( ) : bool |
Process an LSE marker
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| get_sof ( bool is_baseline, bool is_prog, bool is_arith ) : bool |
Process a SOFn marker
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| get_soi ( ) : bool |
Process an SOI marker
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| get_sos ( ) : bool |
Process a SOS marker
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| save_marker ( jpeg_decompress_struct cinfo ) : bool |
Save an APPn or COM marker into the marker list
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| skip_variable ( jpeg_decompress_struct cinfo ) : bool |
Skip over an unknown or uninteresting variable-length marker
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| public jpeg_marker_reader ( jpeg_decompress_struct cinfo ) : System | ||
| cinfo | jpeg_decompress_struct | |
| Результат | System | |
| public jpeg_save_markers ( int marker_code, int length_limit ) : void | ||
| marker_code | int | |
| length_limit | int | |
| Результат | void | |
| public jpeg_set_marker_processor ( int marker_code, jpeg_decompress_struct routine ) : void | ||
| marker_code | int | |
| routine | jpeg_decompress_struct | |
| Результат | void | |