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The Independent JPEG Group's JPEG software v8c

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This commit is contained in:
Guido Vollbeding
2011-01-16 00:00:00 +00:00
committed by DRC
parent a4ecaacde6
commit c39ec149e8
15 changed files with 6065 additions and 3406 deletions
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27
cjpeg.c
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@@ -2,7 +2,7 @@
* cjpeg.c
*
* Copyright (C) 1991-1998, Thomas G. Lane.
* Modified 2003-2008 by Guido Vollbeding.
* Modified 2003-2010 by Guido Vollbeding.
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README file.
*
@@ -165,6 +165,9 @@ usage (void)
fprintf(stderr, " -targa Input file is Targa format (usually not needed)\n");
#endif
fprintf(stderr, "Switches for advanced users:\n");
#ifdef DCT_SCALING_SUPPORTED
fprintf(stderr, " -block N DCT block size (1..16; default is 8)\n");
#endif
#ifdef DCT_ISLOW_SUPPORTED
fprintf(stderr, " -dct int Use integer DCT method%s\n",
(JDCT_DEFAULT == JDCT_ISLOW ? " (default)" : ""));
@@ -254,10 +257,30 @@ parse_switches (j_compress_ptr cinfo, int argc, char **argv,
exit(EXIT_FAILURE);
#endif
} else if (keymatch(arg, "baseline", 1)) {
} else if (keymatch(arg, "baseline", 2)) {
/* Force baseline-compatible output (8-bit quantizer values). */
force_baseline = TRUE;
} else if (keymatch(arg, "block", 2)) {
/* Set DCT block size. */
#if defined(DCT_SCALING_SUPPORTED) && defined(JPEG_LIB_VERSION_MAJOR) && \
(JPEG_LIB_VERSION_MAJOR > 8 || (JPEG_LIB_VERSION_MAJOR == 8 && \
defined(JPEG_LIB_VERSION_MINOR) && JPEG_LIB_VERSION_MINOR >= 3))
int val;
if (++argn >= argc) /* advance to next argument */
usage();
if (sscanf(argv[argn], "%d", &val) != 1)
usage();
if (val < 1 || val > 16)
usage();
cinfo->block_size = val;
#else
fprintf(stderr, "%s: sorry, block size setting not supported\n",
progname);
exit(EXIT_FAILURE);
#endif
} else if (keymatch(arg, "dct", 2)) {
/* Select DCT algorithm. */
if (++argn >= argc) /* advance to next argument */