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425 lines
13 KiB
425 lines
13 KiB
/*
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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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}
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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[DCTSIZE2] = {
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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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static const unsigned int std_chrominance_quant_tbl[DCTSIZE2] = {
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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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LOCAL(void)
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jpeg_default_qtables(j_compress_ptr cinfo, boolean force_baseline)
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{
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jpeg_add_quant_table(cinfo, 0, std_luminance_quant_tbl, q_scale_factor[0],
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force_baseline);
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jpeg_add_quant_table(cinfo, 1, std_chrominance_quant_tbl, q_scale_factor[1],
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force_baseline);
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}
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#endif
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GLOBAL(boolean)
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set_quality_ratings(j_compress_ptr cinfo, char *arg, boolean force_baseline)
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/* Process a quality-ratings parameter string, of the form
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* N[,N,...]
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* If there are more q-table slots than parameters, the last value is replicated.
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*/
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{
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int val = 75; /* default value */
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int tblno;
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char ch;
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for (tblno = 0; tblno < NUM_QUANT_TBLS; tblno++) {
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if (*arg) {
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ch = ','; /* if not set by sscanf, will be ',' */
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if (sscanf(arg, "%d%c", &val, &ch) < 1)
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return FALSE;
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if (ch != ',') /* syntax check */
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return FALSE;
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/* Convert user 0-100 rating to percentage scaling */
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#if JPEG_LIB_VERSION >= 70
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cinfo->q_scale_factor[tblno] = jpeg_quality_scaling(val);
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#else
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q_scale_factor[tblno] = jpeg_quality_scaling(val);
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#endif
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while (*arg && *arg++ != ','); /* advance to next segment of arg
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string */
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} else {
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/* reached end of parameter, set remaining factors to last value */
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#if JPEG_LIB_VERSION >= 70
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cinfo->q_scale_factor[tblno] = jpeg_quality_scaling(val);
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#else
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q_scale_factor[tblno] = jpeg_quality_scaling(val);
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#endif
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}
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}
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jpeg_default_qtables(cinfo, force_baseline);
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return TRUE;
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}
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GLOBAL(boolean)
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set_quant_slots(j_compress_ptr cinfo, char *arg)
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/* Process a quantization-table-selectors parameter string, of the form
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* N[,N,...]
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* If there are more components than parameters, the last value is replicated.
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*/
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{
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int val = 0; /* default table # */
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int ci;
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char ch;
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for (ci = 0; ci < MAX_COMPONENTS; ci++) {
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if (*arg) {
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ch = ','; /* if not set by sscanf, will be ',' */
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if (sscanf(arg, "%d%c", &val, &ch) < 1)
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return FALSE;
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if (ch != ',') /* syntax check */
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return FALSE;
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if (val < 0 || val >= NUM_QUANT_TBLS) {
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fprintf(stderr, "JPEG quantization tables are numbered 0..%d\n",
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NUM_QUANT_TBLS - 1);
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return FALSE;
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}
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cinfo->comp_info[ci].quant_tbl_no = val;
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while (*arg && *arg++ != ','); /* advance to next segment of arg
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string */
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} else {
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/* reached end of parameter, set remaining components to last table */
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cinfo->comp_info[ci].quant_tbl_no = val;
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}
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}
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return TRUE;
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}
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GLOBAL(boolean)
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set_sample_factors(j_compress_ptr cinfo, char *arg)
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/* Process a sample-factors parameter string, of the form
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* HxV[,HxV,...]
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* If there are more components than parameters, "1x1" is assumed for the rest.
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*/
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{
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int ci, val1, val2;
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char ch1, ch2;
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for (ci = 0; ci < MAX_COMPONENTS; ci++) {
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if (*arg) {
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ch2 = ','; /* if not set by sscanf, will be ',' */
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if (sscanf(arg, "%d%c%d%c", &val1, &ch1, &val2, &ch2) < 3)
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return FALSE;
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if ((ch1 != 'x' && ch1 != 'X') || ch2 != ',') /* syntax check */
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return FALSE;
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if (val1 <= 0 || val1 > 4 || val2 <= 0 || val2 > 4) {
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fprintf(stderr, "JPEG sampling factors must be 1..4\n");
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return FALSE;
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}
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cinfo->comp_info[ci].h_samp_factor = val1;
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cinfo->comp_info[ci].v_samp_factor = val2;
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while (*arg && *arg++ != ','); /* advance to next segment of arg
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string */
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} else {
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/* reached end of parameter, set remaining components to 1x1 sampling */
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cinfo->comp_info[ci].h_samp_factor = 1;
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cinfo->comp_info[ci].v_samp_factor = 1;
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}
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}
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return TRUE;
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}
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