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Merge pull request #251 from lambdapioneer/fix_dcscanopt

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Calculate jpeg_simple_progression nscans correctly when dc_scan_opt_mode
This commit is contained in:
Kornel
2017-04-24 10:56:12 +01:00
committed by GitHub
parent 41dd774c1f 31d957d25a
commit cfff992fc6
1 changed files with 13 additions and 5 deletions
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18
jcparam.c
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@@ -868,7 +868,13 @@ jpeg_simple_progression (j_compress_ptr cinfo)
ncomps = cinfo->num_components;
if (ncomps == 3 && cinfo->jpeg_color_space == JCS_YCbCr) {
/* Custom script for YCbCr color images. */
nscans = 10;
if (cinfo->master->dc_scan_opt_mode == 0) {
nscans = 8; /* 1 DC scan for all components */
} else if (cinfo->master->dc_scan_opt_mode == 1) {
nscans = 10; /* 1 DC scan for each component */
} else {
nscans = 9; /* 1 DC scan for luminance and 1 DC scan for chroma */
}
} else {
/* All-purpose script for other color spaces. */
if (cinfo->master->compress_profile == JCP_MAX_COMPRESSION) {
@@ -906,14 +912,16 @@ jpeg_simple_progression (j_compress_ptr cinfo)
if (cinfo->master->compress_profile == JCP_MAX_COMPRESSION) {
/* scan defined in jpeg_scan_rgb.txt in jpgcrush */
/* Initial DC scan */
if (cinfo->master->dc_scan_opt_mode == 0)
if (cinfo->master->dc_scan_opt_mode == 0) {
/* 1 DC scan for all components */
scanptr = fill_dc_scans(scanptr, ncomps, 0, 0);
else if (cinfo->master->dc_scan_opt_mode == 1) {
} else if (cinfo->master->dc_scan_opt_mode == 1) {
/* 1 DC scan for each component */
scanptr = fill_a_scan(scanptr, 0, 0, 0, 0, 0);
scanptr = fill_a_scan(scanptr, 1, 0, 0, 0, 0);
scanptr = fill_a_scan(scanptr, 2, 0, 0, 0, 0);
}
else {
} else {
/* 1 DC scan for luminance and 1 DC scan for chroma */
scanptr = fill_dc_scans(scanptr, 1, 0, 0);
scanptr = fill_a_scan_pair(scanptr, 1, 0, 0, 0, 0);
}