717 lines
18 KiB
C
717 lines
18 KiB
C
/*
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* jcmarker.c
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*
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* Copyright (C) 1991-1998, Thomas G. Lane.
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* Modified 2003-2019 by Guido Vollbeding.
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* This file is part of the Independent JPEG Group's software.
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* For conditions of distribution and use, see the accompanying README file.
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*
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* This file contains routines to write JPEG datastream markers.
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*/
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#define JPEG_INTERNALS
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#include "jinclude.h"
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#include "jpeglib.h"
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typedef enum { /* JPEG marker codes */
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M_SOF0 = 0xc0,
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M_SOF1 = 0xc1,
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M_SOF2 = 0xc2,
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M_SOF3 = 0xc3,
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M_SOF5 = 0xc5,
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M_SOF6 = 0xc6,
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M_SOF7 = 0xc7,
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M_JPG = 0xc8,
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M_SOF9 = 0xc9,
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M_SOF10 = 0xca,
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M_SOF11 = 0xcb,
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M_SOF13 = 0xcd,
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M_SOF14 = 0xce,
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M_SOF15 = 0xcf,
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M_DHT = 0xc4,
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M_DAC = 0xcc,
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M_RST0 = 0xd0,
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M_RST1 = 0xd1,
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M_RST2 = 0xd2,
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M_RST3 = 0xd3,
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M_RST4 = 0xd4,
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M_RST5 = 0xd5,
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M_RST6 = 0xd6,
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M_RST7 = 0xd7,
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M_SOI = 0xd8,
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M_EOI = 0xd9,
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M_SOS = 0xda,
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M_DQT = 0xdb,
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M_DNL = 0xdc,
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M_DRI = 0xdd,
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M_DHP = 0xde,
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M_EXP = 0xdf,
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M_APP0 = 0xe0,
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M_APP1 = 0xe1,
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M_APP2 = 0xe2,
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M_APP3 = 0xe3,
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M_APP4 = 0xe4,
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M_APP5 = 0xe5,
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M_APP6 = 0xe6,
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M_APP7 = 0xe7,
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M_APP8 = 0xe8,
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M_APP9 = 0xe9,
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M_APP10 = 0xea,
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M_APP11 = 0xeb,
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M_APP12 = 0xec,
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M_APP13 = 0xed,
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M_APP14 = 0xee,
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M_APP15 = 0xef,
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M_JPG0 = 0xf0,
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M_JPG8 = 0xf8,
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M_JPG13 = 0xfd,
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M_COM = 0xfe,
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M_TEM = 0x01,
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M_ERROR = 0x100
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} JPEG_MARKER;
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/* Private state */
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typedef struct {
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struct jpeg_marker_writer pub; /* public fields */
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unsigned int last_restart_interval; /* last DRI value emitted; 0 after SOI */
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} my_marker_writer;
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typedef my_marker_writer * my_marker_ptr;
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/*
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* Basic output routines.
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*
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* Note that we do not support suspension while writing a marker.
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* Therefore, an application using suspension must ensure that there is
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* enough buffer space for the initial markers (typ. 600-700 bytes) before
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* calling jpeg_start_compress, and enough space to write the trailing EOI
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* (a few bytes) before calling jpeg_finish_compress. Multipass compression
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* modes are not supported at all with suspension, so those two are the only
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* points where markers will be written.
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*/
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LOCAL(void)
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emit_byte (j_compress_ptr cinfo, int val)
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/* Emit a byte */
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{
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struct jpeg_destination_mgr * dest = cinfo->dest;
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*(dest->next_output_byte)++ = (JOCTET) val;
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if (--dest->free_in_buffer == 0) {
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if (! (*dest->empty_output_buffer) (cinfo))
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ERREXIT(cinfo, JERR_CANT_SUSPEND);
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}
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}
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LOCAL(void)
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emit_marker (j_compress_ptr cinfo, JPEG_MARKER mark)
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/* Emit a marker code */
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{
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emit_byte(cinfo, 0xFF);
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emit_byte(cinfo, (int) mark);
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}
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LOCAL(void)
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emit_2bytes (j_compress_ptr cinfo, int value)
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/* Emit a 2-byte integer; these are always MSB first in JPEG files */
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{
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emit_byte(cinfo, (value >> 8) & 0xFF);
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emit_byte(cinfo, value & 0xFF);
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}
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/*
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* Routines to write specific marker types.
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*/
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LOCAL(int)
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emit_dqt (j_compress_ptr cinfo, int index)
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/* Emit a DQT marker */
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/* Returns the precision used (0 = 8bits, 1 = 16bits) for baseline checking */
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{
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JQUANT_TBL * qtbl = cinfo->quant_tbl_ptrs[index];
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int prec;
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int i;
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if (qtbl == NULL)
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ERREXIT1(cinfo, JERR_NO_QUANT_TABLE, index);
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prec = 0;
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for (i = 0; i <= cinfo->lim_Se; i++) {
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if (qtbl->quantval[cinfo->natural_order[i]] > 255)
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prec = 1;
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}
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if (! qtbl->sent_table) {
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emit_marker(cinfo, M_DQT);
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emit_2bytes(cinfo,
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prec ? cinfo->lim_Se * 2 + 2 + 1 + 2 : cinfo->lim_Se + 1 + 1 + 2);
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emit_byte(cinfo, index + (prec<<4));
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for (i = 0; i <= cinfo->lim_Se; i++) {
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/* The table entries must be emitted in zigzag order. */
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unsigned int qval = qtbl->quantval[cinfo->natural_order[i]];
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if (prec)
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emit_byte(cinfo, (int) (qval >> 8));
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emit_byte(cinfo, (int) (qval & 0xFF));
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}
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qtbl->sent_table = TRUE;
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}
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return prec;
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}
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LOCAL(void)
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emit_dht (j_compress_ptr cinfo, int index, boolean is_ac)
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/* Emit a DHT marker */
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{
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JHUFF_TBL * htbl;
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int length, i;
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if (is_ac) {
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htbl = cinfo->ac_huff_tbl_ptrs[index];
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index += 0x10; /* output index has AC bit set */
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} else {
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htbl = cinfo->dc_huff_tbl_ptrs[index];
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}
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if (htbl == NULL)
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ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, index);
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if (! htbl->sent_table) {
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emit_marker(cinfo, M_DHT);
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length = 0;
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for (i = 1; i <= 16; i++)
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length += htbl->bits[i];
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emit_2bytes(cinfo, length + 2 + 1 + 16);
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emit_byte(cinfo, index);
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for (i = 1; i <= 16; i++)
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emit_byte(cinfo, htbl->bits[i]);
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for (i = 0; i < length; i++)
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emit_byte(cinfo, htbl->huffval[i]);
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htbl->sent_table = TRUE;
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}
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}
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LOCAL(void)
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emit_dac (j_compress_ptr cinfo)
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/* Emit a DAC marker */
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/* Since the useful info is so small, we want to emit all the tables in */
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/* one DAC marker. Therefore this routine does its own scan of the table. */
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{
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#ifdef C_ARITH_CODING_SUPPORTED
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char dc_in_use[NUM_ARITH_TBLS];
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char ac_in_use[NUM_ARITH_TBLS];
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int length, i;
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jpeg_component_info *compptr;
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for (i = 0; i < NUM_ARITH_TBLS; i++)
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dc_in_use[i] = ac_in_use[i] = 0;
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for (i = 0; i < cinfo->comps_in_scan; i++) {
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compptr = cinfo->cur_comp_info[i];
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/* DC needs no table for refinement scan */
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if (cinfo->Ss == 0 && cinfo->Ah == 0)
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dc_in_use[compptr->dc_tbl_no] = 1;
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/* AC needs no table when not present */
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if (cinfo->Se)
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ac_in_use[compptr->ac_tbl_no] = 1;
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}
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length = 0;
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for (i = 0; i < NUM_ARITH_TBLS; i++)
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length += dc_in_use[i] + ac_in_use[i];
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if (length) {
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emit_marker(cinfo, M_DAC);
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emit_2bytes(cinfo, length*2 + 2);
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for (i = 0; i < NUM_ARITH_TBLS; i++) {
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if (dc_in_use[i]) {
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emit_byte(cinfo, i);
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emit_byte(cinfo, cinfo->arith_dc_L[i] + (cinfo->arith_dc_U[i]<<4));
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}
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if (ac_in_use[i]) {
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emit_byte(cinfo, i + 0x10);
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emit_byte(cinfo, cinfo->arith_ac_K[i]);
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}
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}
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}
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#endif /* C_ARITH_CODING_SUPPORTED */
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}
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LOCAL(void)
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emit_dri (j_compress_ptr cinfo)
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/* Emit a DRI marker */
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{
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emit_marker(cinfo, M_DRI);
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emit_2bytes(cinfo, 4); /* fixed length */
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emit_2bytes(cinfo, (int) cinfo->restart_interval);
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}
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LOCAL(void)
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emit_lse_ict (j_compress_ptr cinfo)
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/* Emit an LSE inverse color transform specification marker */
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{
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/* Support only 1 transform */
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if (cinfo->color_transform != JCT_SUBTRACT_GREEN ||
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cinfo->num_components < 3)
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ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
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emit_marker(cinfo, M_JPG8);
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emit_2bytes(cinfo, 24); /* fixed length */
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emit_byte(cinfo, 0x0D); /* ID inverse transform specification */
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emit_2bytes(cinfo, MAXJSAMPLE); /* MAXTRANS */
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emit_byte(cinfo, 3); /* Nt=3 */
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emit_byte(cinfo, cinfo->comp_info[1].component_id);
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emit_byte(cinfo, cinfo->comp_info[0].component_id);
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emit_byte(cinfo, cinfo->comp_info[2].component_id);
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emit_byte(cinfo, 0x80); /* F1: CENTER1=1, NORM1=0 */
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emit_2bytes(cinfo, 0); /* A(1,1)=0 */
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emit_2bytes(cinfo, 0); /* A(1,2)=0 */
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emit_byte(cinfo, 0); /* F2: CENTER2=0, NORM2=0 */
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emit_2bytes(cinfo, 1); /* A(2,1)=1 */
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emit_2bytes(cinfo, 0); /* A(2,2)=0 */
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emit_byte(cinfo, 0); /* F3: CENTER3=0, NORM3=0 */
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emit_2bytes(cinfo, 1); /* A(3,1)=1 */
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emit_2bytes(cinfo, 0); /* A(3,2)=0 */
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}
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LOCAL(void)
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emit_sof (j_compress_ptr cinfo, JPEG_MARKER code)
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/* Emit a SOF marker */
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{
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int ci;
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jpeg_component_info *compptr;
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emit_marker(cinfo, code);
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emit_2bytes(cinfo, 3 * cinfo->num_components + 2 + 5 + 1); /* length */
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/* Make sure image isn't bigger than SOF field can handle */
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if ((long) cinfo->jpeg_height > 65535L ||
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(long) cinfo->jpeg_width > 65535L)
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ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) 65535);
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emit_byte(cinfo, cinfo->data_precision);
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emit_2bytes(cinfo, (int) cinfo->jpeg_height);
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emit_2bytes(cinfo, (int) cinfo->jpeg_width);
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emit_byte(cinfo, cinfo->num_components);
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for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
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ci++, compptr++) {
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emit_byte(cinfo, compptr->component_id);
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emit_byte(cinfo, (compptr->h_samp_factor << 4) + compptr->v_samp_factor);
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emit_byte(cinfo, compptr->quant_tbl_no);
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}
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}
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LOCAL(void)
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emit_sos (j_compress_ptr cinfo)
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/* Emit a SOS marker */
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{
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int i, td, ta;
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jpeg_component_info *compptr;
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emit_marker(cinfo, M_SOS);
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emit_2bytes(cinfo, 2 * cinfo->comps_in_scan + 2 + 1 + 3); /* length */
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emit_byte(cinfo, cinfo->comps_in_scan);
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for (i = 0; i < cinfo->comps_in_scan; i++) {
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compptr = cinfo->cur_comp_info[i];
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emit_byte(cinfo, compptr->component_id);
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/* We emit 0 for unused field(s); this is recommended by the P&M text
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* but does not seem to be specified in the standard.
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*/
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/* DC needs no table for refinement scan */
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td = cinfo->Ss == 0 && cinfo->Ah == 0 ? compptr->dc_tbl_no : 0;
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/* AC needs no table when not present */
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ta = cinfo->Se ? compptr->ac_tbl_no : 0;
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emit_byte(cinfo, (td << 4) + ta);
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}
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emit_byte(cinfo, cinfo->Ss);
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emit_byte(cinfo, cinfo->Se);
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emit_byte(cinfo, (cinfo->Ah << 4) + cinfo->Al);
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}
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LOCAL(void)
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emit_pseudo_sos (j_compress_ptr cinfo)
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/* Emit a pseudo SOS marker */
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{
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emit_marker(cinfo, M_SOS);
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emit_2bytes(cinfo, 2 + 1 + 3); /* length */
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emit_byte(cinfo, 0); /* Ns */
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emit_byte(cinfo, 0); /* Ss */
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emit_byte(cinfo, cinfo->block_size * cinfo->block_size - 1); /* Se */
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emit_byte(cinfo, 0); /* Ah/Al */
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}
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LOCAL(void)
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emit_jfif_app0 (j_compress_ptr cinfo)
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/* Emit a JFIF-compliant APP0 marker */
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{
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/*
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* Length of APP0 block (2 bytes)
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* Block ID (4 bytes - ASCII "JFIF")
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* Zero byte (1 byte to terminate the ID string)
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* Version Major, Minor (2 bytes - major first)
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* Units (1 byte - 0x00 = none, 0x01 = inch, 0x02 = cm)
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* Xdpu (2 bytes - dots per unit horizontal)
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* Ydpu (2 bytes - dots per unit vertical)
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* Thumbnail X size (1 byte)
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* Thumbnail Y size (1 byte)
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*/
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emit_marker(cinfo, M_APP0);
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emit_2bytes(cinfo, 2 + 4 + 1 + 2 + 1 + 2 + 2 + 1 + 1); /* length */
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emit_byte(cinfo, 0x4A); /* Identifier: ASCII "JFIF" */
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emit_byte(cinfo, 0x46);
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emit_byte(cinfo, 0x49);
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emit_byte(cinfo, 0x46);
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emit_byte(cinfo, 0);
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emit_byte(cinfo, cinfo->JFIF_major_version); /* Version fields */
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emit_byte(cinfo, cinfo->JFIF_minor_version);
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emit_byte(cinfo, cinfo->density_unit); /* Pixel size information */
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emit_2bytes(cinfo, (int) cinfo->X_density);
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emit_2bytes(cinfo, (int) cinfo->Y_density);
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emit_byte(cinfo, 0); /* No thumbnail image */
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emit_byte(cinfo, 0);
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}
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LOCAL(void)
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emit_adobe_app14 (j_compress_ptr cinfo)
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/* Emit an Adobe APP14 marker */
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{
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/*
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* Length of APP14 block (2 bytes)
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* Block ID (5 bytes - ASCII "Adobe")
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* Version Number (2 bytes - currently 100)
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* Flags0 (2 bytes - currently 0)
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* Flags1 (2 bytes - currently 0)
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* Color transform (1 byte)
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*
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* Although Adobe TN 5116 mentions Version = 101, all the Adobe files
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* now in circulation seem to use Version = 100, so that's what we write.
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*
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* We write the color transform byte as 1 if the JPEG color space is
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* YCbCr, 2 if it's YCCK, 0 otherwise. Adobe's definition has to do with
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* whether the encoder performed a transformation, which is pretty useless.
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*/
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emit_marker(cinfo, M_APP14);
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emit_2bytes(cinfo, 2 + 5 + 2 + 2 + 2 + 1); /* length */
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emit_byte(cinfo, 0x41); /* Identifier: ASCII "Adobe" */
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emit_byte(cinfo, 0x64);
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emit_byte(cinfo, 0x6F);
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emit_byte(cinfo, 0x62);
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emit_byte(cinfo, 0x65);
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emit_2bytes(cinfo, 100); /* Version */
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emit_2bytes(cinfo, 0); /* Flags0 */
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emit_2bytes(cinfo, 0); /* Flags1 */
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switch (cinfo->jpeg_color_space) {
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case JCS_YCbCr:
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emit_byte(cinfo, 1); /* Color transform = 1 */
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break;
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case JCS_YCCK:
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emit_byte(cinfo, 2); /* Color transform = 2 */
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break;
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default:
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emit_byte(cinfo, 0); /* Color transform = 0 */
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}
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}
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/*
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* These routines allow writing an arbitrary marker with parameters.
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* The only intended use is to emit COM or APPn markers after calling
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* write_file_header and before calling write_frame_header.
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* Other uses are not guaranteed to produce desirable results.
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* Counting the parameter bytes properly is the caller's responsibility.
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*/
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METHODDEF(void)
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write_marker_header (j_compress_ptr cinfo, int marker, unsigned int datalen)
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/* Emit an arbitrary marker header */
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{
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if (datalen > (unsigned int) 65533) /* safety check */
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ERREXIT(cinfo, JERR_BAD_LENGTH);
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emit_marker(cinfo, (JPEG_MARKER) marker);
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emit_2bytes(cinfo, (int) (datalen + 2)); /* total length */
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}
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METHODDEF(void)
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write_marker_byte (j_compress_ptr cinfo, int val)
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/* Emit one byte of marker parameters following write_marker_header */
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{
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emit_byte(cinfo, val);
|
|
}
|
|
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
METHODDEF(void)
|
|
write_file_header (j_compress_ptr cinfo)
|
|
{
|
|
my_marker_ptr marker = (my_marker_ptr) cinfo->marker;
|
|
|
|
emit_marker(cinfo, M_SOI); /* first the SOI */
|
|
|
|
/* SOI is defined to reset restart interval to 0 */
|
|
marker->last_restart_interval = 0;
|
|
|
|
if (cinfo->write_JFIF_header) /* next an optional JFIF APP0 */
|
|
emit_jfif_app0(cinfo);
|
|
if (cinfo->write_Adobe_marker) /* next an optional Adobe APP14 */
|
|
emit_adobe_app14(cinfo);
|
|
}
|
|
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
METHODDEF(void)
|
|
write_frame_header (j_compress_ptr cinfo)
|
|
{
|
|
int ci, prec;
|
|
boolean is_baseline;
|
|
jpeg_component_info *compptr;
|
|
|
|
/* Emit DQT for each quantization table.
|
|
* Note that emit_dqt() suppresses any duplicate tables.
|
|
*/
|
|
prec = 0;
|
|
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
|
|
ci++, compptr++) {
|
|
prec += emit_dqt(cinfo, compptr->quant_tbl_no);
|
|
}
|
|
/* now prec is nonzero iff there are any 16-bit quant tables. */
|
|
|
|
/* Check for a non-baseline specification.
|
|
* Note we assume that Huffman table numbers won't be changed later.
|
|
*/
|
|
if (cinfo->arith_code || cinfo->progressive_mode ||
|
|
cinfo->data_precision != 8 || cinfo->block_size != DCTSIZE) {
|
|
is_baseline = FALSE;
|
|
} else {
|
|
is_baseline = TRUE;
|
|
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
|
|
ci++, compptr++) {
|
|
if (compptr->dc_tbl_no > 1 || compptr->ac_tbl_no > 1)
|
|
is_baseline = FALSE;
|
|
}
|
|
if (prec && is_baseline) {
|
|
is_baseline = FALSE;
|
|
/* If it's baseline except for quantizer size, warn the user */
|
|
TRACEMS(cinfo, 0, JTRC_16BIT_TABLES);
|
|
}
|
|
}
|
|
|
|
/* Emit the proper SOF marker */
|
|
if (cinfo->arith_code) {
|
|
if (cinfo->progressive_mode)
|
|
emit_sof(cinfo, M_SOF10); /* SOF code for progressive arithmetic */
|
|
else
|
|
emit_sof(cinfo, M_SOF9); /* SOF code for sequential arithmetic */
|
|
} else {
|
|
if (cinfo->progressive_mode)
|
|
emit_sof(cinfo, M_SOF2); /* SOF code for progressive Huffman */
|
|
else if (is_baseline)
|
|
emit_sof(cinfo, M_SOF0); /* SOF code for baseline implementation */
|
|
else
|
|
emit_sof(cinfo, M_SOF1); /* SOF code for non-baseline Huffman file */
|
|
}
|
|
|
|
/* Check to emit LSE inverse color transform specification marker */
|
|
if (cinfo->color_transform)
|
|
emit_lse_ict(cinfo);
|
|
|
|
/* Check to emit pseudo SOS marker */
|
|
if (cinfo->progressive_mode && cinfo->block_size != DCTSIZE)
|
|
emit_pseudo_sos(cinfo);
|
|
}
|
|
|
|
|
|
/*
|
|
* Write scan header.
|
|
* This consists of DHT or DAC markers, optional DRI, and SOS.
|
|
* Compressed data will be written following the SOS.
|
|
*/
|
|
|
|
METHODDEF(void)
|
|
write_scan_header (j_compress_ptr cinfo)
|
|
{
|
|
my_marker_ptr marker = (my_marker_ptr) cinfo->marker;
|
|
int i;
|
|
jpeg_component_info *compptr;
|
|
|
|
if (cinfo->arith_code) {
|
|
/* Emit arith conditioning info. We may have some duplication
|
|
* if the file has multiple scans, but it's so small it's hardly
|
|
* worth worrying about.
|
|
*/
|
|
emit_dac(cinfo);
|
|
} else {
|
|
/* Emit Huffman tables.
|
|
* Note that emit_dht() suppresses any duplicate tables.
|
|
*/
|
|
for (i = 0; i < cinfo->comps_in_scan; i++) {
|
|
compptr = cinfo->cur_comp_info[i];
|
|
/* DC needs no table for refinement scan */
|
|
if (cinfo->Ss == 0 && cinfo->Ah == 0)
|
|
emit_dht(cinfo, compptr->dc_tbl_no, FALSE);
|
|
/* AC needs no table when not present */
|
|
if (cinfo->Se)
|
|
emit_dht(cinfo, compptr->ac_tbl_no, TRUE);
|
|
}
|
|
}
|
|
|
|
/* Emit DRI if required --- note that DRI value could change for each scan.
|
|
* We avoid wasting space with unnecessary DRIs, however.
|
|
*/
|
|
if (cinfo->restart_interval != marker->last_restart_interval) {
|
|
emit_dri(cinfo);
|
|
marker->last_restart_interval = cinfo->restart_interval;
|
|
}
|
|
|
|
emit_sos(cinfo);
|
|
}
|
|
|
|
|
|
/*
|
|
* Write datastream trailer.
|
|
*/
|
|
|
|
METHODDEF(void)
|
|
write_file_trailer (j_compress_ptr cinfo)
|
|
{
|
|
emit_marker(cinfo, M_EOI);
|
|
}
|
|
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
METHODDEF(void)
|
|
write_tables_only (j_compress_ptr cinfo)
|
|
{
|
|
int i;
|
|
|
|
emit_marker(cinfo, M_SOI);
|
|
|
|
for (i = 0; i < NUM_QUANT_TBLS; i++) {
|
|
if (cinfo->quant_tbl_ptrs[i] != NULL)
|
|
(void) emit_dqt(cinfo, i);
|
|
}
|
|
|
|
if (! cinfo->arith_code) {
|
|
for (i = 0; i < NUM_HUFF_TBLS; i++) {
|
|
if (cinfo->dc_huff_tbl_ptrs[i] != NULL)
|
|
emit_dht(cinfo, i, FALSE);
|
|
if (cinfo->ac_huff_tbl_ptrs[i] != NULL)
|
|
emit_dht(cinfo, i, TRUE);
|
|
}
|
|
}
|
|
|
|
emit_marker(cinfo, M_EOI);
|
|
}
|
|
|
|
|
|
/*
|
|
* Initialize the marker writer module.
|
|
*/
|
|
|
|
GLOBAL(void)
|
|
jinit_marker_writer (j_compress_ptr cinfo)
|
|
{
|
|
my_marker_ptr marker;
|
|
|
|
/* Create the subobject */
|
|
marker = (my_marker_ptr) (*cinfo->mem->alloc_small)
|
|
((j_common_ptr) cinfo, JPOOL_IMAGE, SIZEOF(my_marker_writer));
|
|
cinfo->marker = &marker->pub;
|
|
/* Initialize method pointers */
|
|
marker->pub.write_file_header = write_file_header;
|
|
marker->pub.write_frame_header = write_frame_header;
|
|
marker->pub.write_scan_header = write_scan_header;
|
|
marker->pub.write_file_trailer = write_file_trailer;
|
|
marker->pub.write_tables_only = write_tables_only;
|
|
marker->pub.write_marker_header = write_marker_header;
|
|
marker->pub.write_marker_byte = write_marker_byte;
|
|
/* Initialize private state */
|
|
marker->last_restart_interval = 0;
|
|
}
|