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Add a -skip option to djpeg, which opens up further regression testing options.

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git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@1583 632fc199-4ca6-4c93-a231-07263d6284db
This commit is contained in:
DRC
2015-06-25 03:44:37 +00:00
parent eb32cc1e6d
commit 07afe8a50f
1 changed files with 35 additions and 9 deletions
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44
djpeg.c
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@@ -89,7 +89,7 @@ static IMAGE_FORMATS requested_fmt;
static const char * progname; /* program name for error messages */
static char * outfilename; /* for -outfile switch */
boolean memsrc; /* for -memsrc switch */
boolean stripe;
boolean stripe, skip;
JDIMENSION startY, endY;
#define INPUT_BUF_SIZE 4096
@@ -167,7 +167,8 @@ usage (void)
fprintf(stderr, " -memsrc Load input file into memory before decompressing\n");
#endif
fprintf(stderr, " -stripe Y0,Y1 Decode a horizontal stripe of the image [Y0, Y1)\n");
fprintf(stderr, " -skip Y0,Y1 Skip decoding a horizontal stripe of the image [Y0, Y1)\n");
fprintf(stderr, " -stripe Y0,Y1 Decode only a horizontal stripe of the image [Y0, Y1)\n");
fprintf(stderr, " -verbose or -debug Emit debug output\n");
fprintf(stderr, " -version Print version information and exit\n");
exit(EXIT_FAILURE);
@@ -194,6 +195,7 @@ parse_switches (j_decompress_ptr cinfo, int argc, char **argv,
outfilename = NULL;
memsrc = FALSE;
stripe = FALSE;
skip = FALSE;
cinfo->err->trace_level = 0;
/* Scan command line options, adjust parameters */
@@ -381,6 +383,14 @@ parse_switches (j_decompress_ptr cinfo, int argc, char **argv,
usage();
stripe = TRUE;
} else if (keymatch(arg, "skip", 2)) {
if (++argn >= argc)
usage();
if (sscanf(argv[argn], "%d,%d", &startY, &endY) != 2 || startY > endY)
usage();
skip = TRUE;
} else if (keymatch(arg, "targa", 1)) {
/* Targa output format. */
requested_fmt = FMT_TARGA;
@@ -647,7 +657,7 @@ main (int argc, char **argv)
(void) jpeg_start_decompress(&cinfo);
/* Stripe decode */
if (stripe) {
if (stripe || skip) {
JDIMENSION tmp;
/* Check for valid endY. We cannot check this value until after
@@ -665,17 +675,33 @@ main (int argc, char **argv)
*/
tmp = cinfo.output_height;
cinfo.output_height = endY - startY;
if (skip)
cinfo.output_height = tmp - cinfo.output_height;
(*dest_mgr->start_output) (&cinfo, dest_mgr);
cinfo.output_height = tmp;
/* Process data */
(void) jpeg_skip_scanlines(&cinfo, startY);
while (cinfo.output_scanline < endY) {
num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
dest_mgr->buffer_height);
(*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
if (skip) {
while (cinfo.output_scanline < startY) {
num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
dest_mgr->buffer_height);
(*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
}
jpeg_skip_scanlines(&cinfo, endY - startY);
while (cinfo.output_scanline < cinfo.output_height) {
num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
dest_mgr->buffer_height);
(*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
}
} else {
jpeg_skip_scanlines(&cinfo, startY);
while (cinfo.output_scanline < endY) {
num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
dest_mgr->buffer_height);
(*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
}
jpeg_skip_scanlines(&cinfo, cinfo.output_height - endY);
}
(void) jpeg_skip_scanlines(&cinfo, cinfo.output_height - endY);
/* Normal full image decode */
} else {