639 lines
20 KiB
C
639 lines
20 KiB
C
/*
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* rdswitch.c
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*
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* This file was part of the Independent JPEG Group's software:
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* Copyright (C) 1991-1996, Thomas G. Lane.
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* libjpeg-turbo Modifications:
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* Copyright (C) 2010, 2018, D. R. Commander.
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* For conditions of distribution and use, see the accompanying README.ijg
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* file.
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*
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* This file contains routines to process some of cjpeg's more complicated
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* command-line switches. Switches processed here are:
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* -qtables file Read quantization tables from text file
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* -scans file Read scan script from text file
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* -quality N[,N,...] Set quality ratings
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* -qslots N[,N,...] Set component quantization table selectors
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* -sample HxV[,HxV,...] Set component sampling factors
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*/
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#include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */
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#include <ctype.h> /* to declare isdigit(), isspace() */
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LOCAL(int)
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text_getc (FILE *file)
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/* Read next char, skipping over any comments (# to end of line) */
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/* A comment/newline sequence is returned as a newline */
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{
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register int ch;
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ch = getc(file);
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if (ch == '#') {
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do {
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ch = getc(file);
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} while (ch != '\n' && ch != EOF);
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}
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return ch;
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}
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LOCAL(boolean)
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read_text_integer (FILE *file, long *result, int *termchar)
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/* Read an unsigned decimal integer from a file, store it in result */
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/* Reads one trailing character after the integer; returns it in termchar */
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{
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register int ch;
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register long val;
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/* Skip any leading whitespace, detect EOF */
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do {
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ch = text_getc(file);
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if (ch == EOF) {
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*termchar = ch;
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return FALSE;
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}
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} while (isspace(ch));
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if (! isdigit(ch)) {
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*termchar = ch;
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return FALSE;
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}
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val = ch - '0';
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while ((ch = text_getc(file)) != EOF) {
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if (! isdigit(ch))
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break;
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val *= 10;
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val += ch - '0';
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}
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*result = val;
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*termchar = ch;
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return TRUE;
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}
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#if JPEG_LIB_VERSION < 70
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static int q_scale_factor[NUM_QUANT_TBLS] = {100, 100, 100, 100};
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#endif
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GLOBAL(boolean)
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read_quant_tables(j_compress_ptr cinfo, char *filename, boolean force_baseline)
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/* Read a set of quantization tables from the specified file.
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* The file is plain ASCII text: decimal numbers with whitespace between.
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* Comments preceded by '#' may be included in the file.
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* There may be one to NUM_QUANT_TBLS tables in the file, each of 64 values.
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* The tables are implicitly numbered 0,1,etc.
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* NOTE: does not affect the qslots mapping, which will default to selecting
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* table 0 for luminance (or primary) components, 1 for chrominance components.
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* You must use -qslots if you want a different component->table mapping.
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*/
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{
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FILE *fp;
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int tblno, i, termchar;
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long val;
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unsigned int table[DCTSIZE2];
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if ((fp = fopen(filename, "r")) == NULL) {
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fprintf(stderr, "Can't open table file %s\n", filename);
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return FALSE;
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}
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tblno = 0;
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while (read_text_integer(fp, &val, &termchar)) { /* read 1st element of table */
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if (tblno >= NUM_QUANT_TBLS) {
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fprintf(stderr, "Too many tables in file %s\n", filename);
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fclose(fp);
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return FALSE;
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}
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table[0] = (unsigned int) val;
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for (i = 1; i < DCTSIZE2; i++) {
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if (! read_text_integer(fp, &val, &termchar)) {
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fprintf(stderr, "Invalid table data in file %s\n", filename);
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fclose(fp);
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return FALSE;
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}
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table[i] = (unsigned int) val;
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}
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#if JPEG_LIB_VERSION >= 70
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jpeg_add_quant_table(cinfo, tblno, table, cinfo->q_scale_factor[tblno],
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force_baseline);
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#else
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jpeg_add_quant_table(cinfo, tblno, table, q_scale_factor[tblno],
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force_baseline);
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#endif
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tblno++;
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}
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if (termchar != EOF) {
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fprintf(stderr, "Non-numeric data in file %s\n", filename);
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fclose(fp);
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return FALSE;
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}
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fclose(fp);
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return TRUE;
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}
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#ifdef C_MULTISCAN_FILES_SUPPORTED
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LOCAL(boolean)
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read_scan_integer (FILE *file, long *result, int *termchar)
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/* Variant of read_text_integer that always looks for a non-space termchar;
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* this simplifies parsing of punctuation in scan scripts.
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*/
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{
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register int ch;
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if (! read_text_integer(file, result, termchar))
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return FALSE;
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ch = *termchar;
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while (ch != EOF && isspace(ch))
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ch = text_getc(file);
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if (isdigit(ch)) { /* oops, put it back */
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if (ungetc(ch, file) == EOF)
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return FALSE;
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ch = ' ';
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} else {
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/* Any separators other than ';' and ':' are ignored;
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* this allows user to insert commas, etc, if desired.
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*/
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if (ch != EOF && ch != ';' && ch != ':')
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ch = ' ';
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}
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*termchar = ch;
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return TRUE;
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}
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GLOBAL(boolean)
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read_scan_script (j_compress_ptr cinfo, char *filename)
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/* Read a scan script from the specified text file.
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* Each entry in the file defines one scan to be emitted.
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* Entries are separated by semicolons ';'.
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* An entry contains one to four component indexes,
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* optionally followed by a colon ':' and four progressive-JPEG parameters.
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* The component indexes denote which component(s) are to be transmitted
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* in the current scan. The first component has index 0.
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* Sequential JPEG is used if the progressive-JPEG parameters are omitted.
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* The file is free format text: any whitespace may appear between numbers
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* and the ':' and ';' punctuation marks. Also, other punctuation (such
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* as commas or dashes) can be placed between numbers if desired.
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* Comments preceded by '#' may be included in the file.
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* Note: we do very little validity checking here;
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* jcmaster.c will validate the script parameters.
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*/
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{
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FILE *fp;
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int scanno, ncomps, termchar;
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long val;
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jpeg_scan_info *scanptr;
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#define MAX_SCANS 100 /* quite arbitrary limit */
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jpeg_scan_info scans[MAX_SCANS];
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if ((fp = fopen(filename, "r")) == NULL) {
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fprintf(stderr, "Can't open scan definition file %s\n", filename);
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return FALSE;
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}
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scanptr = scans;
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scanno = 0;
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while (read_scan_integer(fp, &val, &termchar)) {
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if (scanno >= MAX_SCANS) {
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fprintf(stderr, "Too many scans defined in file %s\n", filename);
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fclose(fp);
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return FALSE;
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}
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scanptr->component_index[0] = (int) val;
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ncomps = 1;
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while (termchar == ' ') {
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if (ncomps >= MAX_COMPS_IN_SCAN) {
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fprintf(stderr, "Too many components in one scan in file %s\n",
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filename);
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fclose(fp);
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return FALSE;
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}
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if (! read_scan_integer(fp, &val, &termchar))
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goto bogus;
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scanptr->component_index[ncomps] = (int) val;
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ncomps++;
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}
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scanptr->comps_in_scan = ncomps;
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if (termchar == ':') {
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if (! read_scan_integer(fp, &val, &termchar) || termchar != ' ')
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goto bogus;
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scanptr->Ss = (int) val;
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if (! read_scan_integer(fp, &val, &termchar) || termchar != ' ')
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goto bogus;
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scanptr->Se = (int) val;
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if (! read_scan_integer(fp, &val, &termchar) || termchar != ' ')
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goto bogus;
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scanptr->Ah = (int) val;
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if (! read_scan_integer(fp, &val, &termchar))
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goto bogus;
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scanptr->Al = (int) val;
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} else {
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/* set non-progressive parameters */
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scanptr->Ss = 0;
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scanptr->Se = DCTSIZE2-1;
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scanptr->Ah = 0;
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scanptr->Al = 0;
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}
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if (termchar != ';' && termchar != EOF) {
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bogus:
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fprintf(stderr, "Invalid scan entry format in file %s\n", filename);
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fclose(fp);
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return FALSE;
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}
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scanptr++, scanno++;
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}
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if (termchar != EOF) {
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fprintf(stderr, "Non-numeric data in file %s\n", filename);
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fclose(fp);
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return FALSE;
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}
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if (scanno > 0) {
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/* Stash completed scan list in cinfo structure.
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* NOTE: for cjpeg's use, JPOOL_IMAGE is the right lifetime for this data,
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* but if you want to compress multiple images you'd want JPOOL_PERMANENT.
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*/
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scanptr = (jpeg_scan_info *)
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(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
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scanno * sizeof(jpeg_scan_info));
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MEMCOPY(scanptr, scans, scanno * sizeof(jpeg_scan_info));
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cinfo->scan_info = scanptr;
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cinfo->num_scans = scanno;
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/* Disable scan optimization if using custom scan */
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jpeg_c_set_bool_param(cinfo, JBOOLEAN_OPTIMIZE_SCANS, FALSE);
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}
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fclose(fp);
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return TRUE;
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}
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#endif /* C_MULTISCAN_FILES_SUPPORTED */
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#if JPEG_LIB_VERSION < 70
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/* These are the sample quantization tables given in Annex K (Clause K.1) of
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* Recommendation ITU-T T.81 (1992) | ISO/IEC 10918-1:1994.
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* The spec says that the values given produce "good" quality, and
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* when divided by 2, "very good" quality.
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*/
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static const unsigned int std_luminance_quant_tbl[9][DCTSIZE2] = {
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{
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/* JPEG Annex K
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*/
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16, 11, 10, 16, 24, 40, 51, 61,
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12, 12, 14, 19, 26, 58, 60, 55,
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14, 13, 16, 24, 40, 57, 69, 56,
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14, 17, 22, 29, 51, 87, 80, 62,
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18, 22, 37, 56, 68, 109, 103, 77,
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24, 35, 55, 64, 81, 104, 113, 92,
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49, 64, 78, 87, 103, 121, 120, 101,
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72, 92, 95, 98, 112, 100, 103, 99
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},
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{
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/* flat
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*/
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16, 16, 16, 16, 16, 16, 16, 16,
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16, 16, 16, 16, 16, 16, 16, 16,
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16, 16, 16, 16, 16, 16, 16, 16,
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16, 16, 16, 16, 16, 16, 16, 16,
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16, 16, 16, 16, 16, 16, 16, 16,
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16, 16, 16, 16, 16, 16, 16, 16,
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16, 16, 16, 16, 16, 16, 16, 16,
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16, 16, 16, 16, 16, 16, 16, 16
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},
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{
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12, 17, 20, 21, 30, 34, 56, 63,
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18, 20, 20, 26, 28, 51, 61, 55,
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19, 20, 21, 26, 33, 58, 69, 55,
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26, 26, 26, 30, 46, 87, 86, 66,
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31, 33, 36, 40, 46, 96, 100, 73,
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40, 35, 46, 62, 81, 100, 111, 91,
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46, 66, 76, 86, 102, 121, 120, 101,
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68, 90, 90, 96, 113, 102, 105, 103
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},
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{
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/* From http://www.imagemagick.org/discourse-server/viewtopic.php?f=22&t=20333&p=98008#p98008
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*/
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16, 16, 16, 18, 25, 37, 56, 85,
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16, 17, 20, 27, 34, 40, 53, 75,
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16, 20, 24, 31, 43, 62, 91, 135,
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18, 27, 31, 40, 53, 74, 106, 156,
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25, 34, 43, 53, 69, 94, 131, 189,
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37, 40, 62, 74, 94, 124, 169, 238,
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56, 53, 91, 106, 131, 169, 226, 311,
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85, 75, 135, 156, 189, 238, 311, 418
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},
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{
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9, 10, 12, 14, 27, 32, 51, 62,
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11, 12, 14, 19, 27, 44, 59, 73,
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12, 14, 18, 25, 42, 59, 79, 78,
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17, 18, 25, 42, 61, 92, 87, 92,
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23, 28, 42, 75, 79, 112, 112, 99,
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40, 42, 59, 84, 88, 124, 132, 111,
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42, 64, 78, 95, 105, 126, 125, 99,
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70, 75, 100, 102, 116, 100, 107, 98
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},
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{
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/* Relevance of human vision to JPEG-DCT compression (1992) Klein, Silverstein and Carney.
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*/
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10, 12, 14, 19, 26, 38, 57, 86,
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12, 18, 21, 28, 35, 41, 54, 76,
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14, 21, 25, 32, 44, 63, 92, 136,
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19, 28, 32, 41, 54, 75, 107, 157,
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26, 35, 44, 54, 70, 95, 132, 190,
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38, 41, 63, 75, 95, 125, 170, 239,
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57, 54, 92, 107, 132, 170, 227, 312,
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86, 76, 136, 157, 190, 239, 312, 419
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},
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{
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/* DCTune perceptual optimization of compressed dental X-Rays (1997) Watson, Taylor, Borthwick
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*/
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7, 8, 10, 14, 23, 44, 95, 241,
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8, 8, 11, 15, 25, 47, 102, 255,
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10, 11, 13, 19, 31, 58, 127, 255,
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14, 15, 19, 27, 44, 83, 181, 255,
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23, 25, 31, 44, 72, 136, 255, 255,
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44, 47, 58, 83, 136, 255, 255, 255,
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95, 102, 127, 181, 255, 255, 255, 255,
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241, 255, 255, 255, 255, 255, 255, 255
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},
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{
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/* A visual detection model for DCT coefficient quantization (12/9/93) Ahumada, Watson, Peterson
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*/
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15, 11, 11, 12, 15, 19, 25, 32,
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11, 13, 10, 10, 12, 15, 19, 24,
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11, 10, 14, 14, 16, 18, 22, 27,
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12, 10, 14, 18, 21, 24, 28, 33,
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15, 12, 16, 21, 26, 31, 36, 42,
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19, 15, 18, 24, 31, 38, 45, 53,
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25, 19, 22, 28, 36, 45, 55, 65,
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32, 24, 27, 33, 42, 53, 65, 77
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},
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{
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/* An improved detection model for DCT coefficient quantization (1993) Peterson, Ahumada and Watson
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*/
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14, 10, 11, 14, 19, 25, 34, 45,
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10, 11, 11, 12, 15, 20, 26, 33,
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11, 11, 15, 18, 21, 25, 31, 38,
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14, 12, 18, 24, 28, 33, 39, 47,
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19, 15, 21, 28, 36, 43, 51, 59,
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25, 20, 25, 33, 43, 54, 64, 74,
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34, 26, 31, 39, 51, 64, 77, 91,
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45, 33, 38, 47, 59, 74, 91, 108
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}
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};
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static const unsigned int std_chrominance_quant_tbl[9][DCTSIZE2] = {
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{
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/* JPEG Annex K
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*/
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17, 18, 24, 47, 99, 99, 99, 99,
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18, 21, 26, 66, 99, 99, 99, 99,
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24, 26, 56, 99, 99, 99, 99, 99,
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47, 66, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99
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},
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{
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/* flat
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*/
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16, 16, 16, 16, 16, 16, 16, 16,
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16, 16, 16, 16, 16, 16, 16, 16,
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16, 16, 16, 16, 16, 16, 16, 16,
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16, 16, 16, 16, 16, 16, 16, 16,
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16, 16, 16, 16, 16, 16, 16, 16,
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16, 16, 16, 16, 16, 16, 16, 16,
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16, 16, 16, 16, 16, 16, 16, 16,
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16, 16, 16, 16, 16, 16, 16, 16
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},
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{
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8, 12, 15, 15, 86, 96, 96, 98,
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13, 13, 15, 26, 90, 96, 99, 98,
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12, 15, 18, 96, 99, 99, 99, 99,
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17, 16, 90, 96, 99, 99, 99, 99,
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96, 96, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99
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},
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{
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/* From http://www.imagemagick.org/discourse-server/viewtopic.php?f=22&t=20333&p=98008#p98008
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*/
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16, 16, 16, 18, 25, 37, 56, 85,
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16, 17, 20, 27, 34, 40, 53, 75,
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16, 20, 24, 31, 43, 62, 91, 135,
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18, 27, 31, 40, 53, 74, 106, 156,
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25, 34, 43, 53, 69, 94, 131, 189,
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37, 40, 62, 74, 94, 124, 169, 238,
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56, 53, 91, 106, 131, 169, 226, 311,
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85, 75, 135, 156, 189, 238, 311, 418
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},
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{
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9, 10, 17, 19, 62, 89, 91, 97,
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12, 13, 18, 29, 84, 91, 88, 98,
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14, 19, 29, 93, 95, 95, 98, 97,
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20, 26, 84, 88, 95, 95, 98, 94,
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26, 86, 91, 93, 97, 99, 98, 99,
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99, 100, 98, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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97, 97, 99, 99, 99, 99, 97, 99
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},
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{
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/* Relevance of human vision to JPEG-DCT compression (1992) Klein, Silverstein and Carney.
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* Copied from luma
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*/
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10, 12, 14, 19, 26, 38, 57, 86,
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12, 18, 21, 28, 35, 41, 54, 76,
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14, 21, 25, 32, 44, 63, 92, 136,
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19, 28, 32, 41, 54, 75, 107, 157,
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26, 35, 44, 54, 70, 95, 132, 190,
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38, 41, 63, 75, 95, 125, 170, 239,
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57, 54, 92, 107, 132, 170, 227, 312,
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86, 76, 136, 157, 190, 239, 312, 419
|
|
},
|
|
{
|
|
/* DCTune perceptual optimization of compressed dental X-Rays (1997) Watson, Taylor, Borthwick
|
|
* Copied from luma
|
|
*/
|
|
7, 8, 10, 14, 23, 44, 95, 241,
|
|
8, 8, 11, 15, 25, 47, 102, 255,
|
|
10, 11, 13, 19, 31, 58, 127, 255,
|
|
14, 15, 19, 27, 44, 83, 181, 255,
|
|
23, 25, 31, 44, 72, 136, 255, 255,
|
|
44, 47, 58, 83, 136, 255, 255, 255,
|
|
95, 102, 127, 181, 255, 255, 255, 255,
|
|
241, 255, 255, 255, 255, 255, 255, 255
|
|
},
|
|
{
|
|
/* A visual detection model for DCT coefficient quantization (12/9/93) Ahumada, Watson, Peterson
|
|
* Copied from luma
|
|
*/
|
|
15, 11, 11, 12, 15, 19, 25, 32,
|
|
11, 13, 10, 10, 12, 15, 19, 24,
|
|
11, 10, 14, 14, 16, 18, 22, 27,
|
|
12, 10, 14, 18, 21, 24, 28, 33,
|
|
15, 12, 16, 21, 26, 31, 36, 42,
|
|
19, 15, 18, 24, 31, 38, 45, 53,
|
|
25, 19, 22, 28, 36, 45, 55, 65,
|
|
32, 24, 27, 33, 42, 53, 65, 77
|
|
},
|
|
{
|
|
/* An improved detection model for DCT coefficient quantization (1993) Peterson, Ahumada and Watson
|
|
* Copied from luma
|
|
*/
|
|
14, 10, 11, 14, 19, 25, 34, 45,
|
|
10, 11, 11, 12, 15, 20, 26, 33,
|
|
11, 11, 15, 18, 21, 25, 31, 38,
|
|
14, 12, 18, 24, 28, 33, 39, 47,
|
|
19, 15, 21, 28, 36, 43, 51, 59,
|
|
25, 20, 25, 33, 43, 54, 64, 74,
|
|
34, 26, 31, 39, 51, 64, 77, 91,
|
|
45, 33, 38, 47, 59, 74, 91, 108
|
|
}
|
|
};
|
|
|
|
LOCAL(void)
|
|
jpeg_default_qtables (j_compress_ptr cinfo, boolean force_baseline)
|
|
{
|
|
int quant_tbl_master_idx = 0;
|
|
if (jpeg_c_int_param_supported(cinfo, JINT_BASE_QUANT_TBL_IDX))
|
|
quant_tbl_master_idx = jpeg_c_get_int_param(cinfo, JINT_BASE_QUANT_TBL_IDX);
|
|
|
|
jpeg_add_quant_table(cinfo, 0, std_luminance_quant_tbl[quant_tbl_master_idx],
|
|
q_scale_factor[0], force_baseline);
|
|
jpeg_add_quant_table(cinfo, 1, std_chrominance_quant_tbl[quant_tbl_master_idx],
|
|
q_scale_factor[1], force_baseline);
|
|
}
|
|
#endif
|
|
|
|
|
|
GLOBAL(boolean)
|
|
set_quality_ratings (j_compress_ptr cinfo, char *arg, boolean force_baseline)
|
|
/* Process a quality-ratings parameter string, of the form
|
|
* N[,N,...]
|
|
* If there are more q-table slots than parameters, the last value is replicated.
|
|
*/
|
|
{
|
|
float val = 75.f; /* default value */
|
|
int tblno;
|
|
char ch;
|
|
|
|
for (tblno = 0; tblno < NUM_QUANT_TBLS; tblno++) {
|
|
if (*arg) {
|
|
ch = ','; /* if not set by sscanf, will be ',' */
|
|
if (sscanf(arg, "%f%c", &val, &ch) < 1)
|
|
return FALSE;
|
|
if (ch != ',') /* syntax check */
|
|
return FALSE;
|
|
/* Convert user 0-100 rating to percentage scaling */
|
|
#if JPEG_LIB_VERSION >= 70
|
|
cinfo->q_scale_factor[tblno] = jpeg_float_quality_scaling(val);
|
|
#else
|
|
q_scale_factor[tblno] = jpeg_float_quality_scaling(val);
|
|
#endif
|
|
while (*arg && *arg++ != ','); /* advance to next segment of arg
|
|
string */
|
|
} else {
|
|
/* reached end of parameter, set remaining factors to last value */
|
|
#if JPEG_LIB_VERSION >= 70
|
|
cinfo->q_scale_factor[tblno] = jpeg_float_quality_scaling(val);
|
|
#else
|
|
q_scale_factor[tblno] = jpeg_float_quality_scaling(val);
|
|
#endif
|
|
}
|
|
}
|
|
jpeg_default_qtables(cinfo, force_baseline);
|
|
|
|
/* For some images chroma subsampling significantly degrades color quality,
|
|
making it impossible to achieve high visual quality regardless of quality setting.
|
|
To make the quality setting more intuitive, disable subsampling when high-quality
|
|
color is desired. */
|
|
if (val >= 90) {
|
|
set_sample_factors(cinfo, "1x1");
|
|
} else if (val >= 80) {
|
|
set_sample_factors(cinfo, "2x1");
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
GLOBAL(boolean)
|
|
set_quant_slots (j_compress_ptr cinfo, char *arg)
|
|
/* Process a quantization-table-selectors parameter string, of the form
|
|
* N[,N,...]
|
|
* If there are more components than parameters, the last value is replicated.
|
|
*/
|
|
{
|
|
int val = 0; /* default table # */
|
|
int ci;
|
|
char ch;
|
|
|
|
for (ci = 0; ci < MAX_COMPONENTS; ci++) {
|
|
if (*arg) {
|
|
ch = ','; /* if not set by sscanf, will be ',' */
|
|
if (sscanf(arg, "%d%c", &val, &ch) < 1)
|
|
return FALSE;
|
|
if (ch != ',') /* syntax check */
|
|
return FALSE;
|
|
if (val < 0 || val >= NUM_QUANT_TBLS) {
|
|
fprintf(stderr, "JPEG quantization tables are numbered 0..%d\n",
|
|
NUM_QUANT_TBLS-1);
|
|
return FALSE;
|
|
}
|
|
cinfo->comp_info[ci].quant_tbl_no = val;
|
|
while (*arg && *arg++ != ','); /* advance to next segment of arg
|
|
string */
|
|
} else {
|
|
/* reached end of parameter, set remaining components to last table */
|
|
cinfo->comp_info[ci].quant_tbl_no = val;
|
|
}
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
GLOBAL(boolean)
|
|
set_sample_factors (j_compress_ptr cinfo, char *arg)
|
|
/* Process a sample-factors parameter string, of the form
|
|
* HxV[,HxV,...]
|
|
* If there are more components than parameters, "1x1" is assumed for the rest.
|
|
*/
|
|
{
|
|
int ci, val1, val2;
|
|
char ch1, ch2;
|
|
|
|
for (ci = 0; ci < MAX_COMPONENTS; ci++) {
|
|
if (*arg) {
|
|
ch2 = ','; /* if not set by sscanf, will be ',' */
|
|
if (sscanf(arg, "%d%c%d%c", &val1, &ch1, &val2, &ch2) < 3)
|
|
return FALSE;
|
|
if ((ch1 != 'x' && ch1 != 'X') || ch2 != ',') /* syntax check */
|
|
return FALSE;
|
|
if (val1 <= 0 || val1 > 4 || val2 <= 0 || val2 > 4) {
|
|
fprintf(stderr, "JPEG sampling factors must be 1..4\n");
|
|
return FALSE;
|
|
}
|
|
cinfo->comp_info[ci].h_samp_factor = val1;
|
|
cinfo->comp_info[ci].v_samp_factor = val2;
|
|
while (*arg && *arg++ != ','); /* advance to next segment of arg
|
|
string */
|
|
} else {
|
|
/* reached end of parameter, set remaining components to 1x1 sampling */
|
|
cinfo->comp_info[ci].h_samp_factor = 1;
|
|
cinfo->comp_info[ci].v_samp_factor = 1;
|
|
}
|
|
}
|
|
return TRUE;
|
|
}
|