| Method | Description | |
|---|---|---|
| jpeg_marker_writer ( jpeg_compress_struct cinfo ) | ||
| write_file_header ( ) : void |
Write datastream header. This consists of an SOI and optional APPn markers. We recommend use of the JFIF marker, but not the Adobe marker, when using YCbCr or grayscale data. The JFIF marker is also used for other standard JPEG colorspaces. The Adobe marker is helpful to distinguish RGB, CMYK, and YCCK colorspaces. Note that an application can write additional header markers after jpeg_start_compress returns.
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| write_file_trailer ( ) : void |
Write datastream trailer.
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| write_frame_header ( ) : void |
Write frame header. This consists of DQT and SOFn markers, a conditional LSE marker and a conditional pseudo SOS marker. Note that we do not emit the SOF until we have emitted the DQT(s). This avoids compatibility problems with incorrect implementations that try to error-check the quant table numbers as soon as they see the SOF.
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| write_marker_byte ( byte val ) : void |
Emit one byte of marker parameters following write_marker_header
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| write_marker_header ( int marker, int datalen ) : void |
Emit an arbitrary marker header
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| write_scan_header ( ) : void |
Write scan header. This consists of DHT or DAC markers, optional DRI, and SOS. Compressed data will be written following the SOS.
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| write_tables_only ( ) : void |
Write an abbreviated table-specification datastream. This consists of SOI, DQT and DHT tables, and EOI. Any table that is defined and not marked sent_table = true will be emitted. Note that all tables will be marked sent_table = true at exit.
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| Method | Description | |
|---|---|---|
| emit_2bytes ( int value ) : void |
Emit a 2-byte integer; these are always MSB first in JPEG files
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| emit_adobe_app14 ( ) : void |
Emit an Adobe APP14 marker
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| emit_byte ( int val ) : void |
Emit a byte
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| emit_dac ( ) : void | ||
| emit_dht ( int index, bool is_ac ) : void |
Emit a DHT marker
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| emit_dqt ( int index ) : int |
Emit a DQT marker
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| emit_dri ( ) : void |
Emit a DRI marker
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| emit_jfif_app0 ( ) : void |
Emit a JFIF-compliant APP0 marker
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| emit_lse_ict ( ) : void |
Emit an LSE inverse color transform specification marker
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| emit_marker ( JPEG_MARKER mark ) : void |
Emit a marker code
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| emit_pseudo_sos ( ) : void |
Emit a pseudo SOS marker
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| emit_sof ( JPEG_MARKER code ) : void |
Emit a SOF marker
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| emit_sos ( ) : void |
Emit a SOS marker
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| public jpeg_marker_writer ( jpeg_compress_struct cinfo ) | ||
| cinfo | jpeg_compress_struct | |
| public write_marker_header ( int marker, int datalen ) : void | ||
| marker | int | |
| datalen | int | |
| return | void | |