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Calculate jpeg_simple_progression nscans correctly

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This commit is contained in:
Daniel Hugenroth
2017-07-06 11:18:19 +01:00
parent a9bfef2a57
commit fb27709ab1
1 changed files with 10 additions and 6 deletions
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16
jcparam.c
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@@ -864,16 +864,20 @@ jpeg_simple_progression (j_compress_ptr cinfo)
if (cinfo->global_state != CSTATE_START)
ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
/* Figure space needed for script. Calculation must match code below! */
/* Figure space needed for script. Calculation must match code below! */
ncomps = cinfo->num_components;
if (ncomps == 3 && cinfo->jpeg_color_space == JCS_YCbCr) {
/* Custom script for YCbCr color images. */
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 */
if (cinfo->master->compress_profile == JCP_MAX_COMPRESSION) {
if (cinfo->master->dc_scan_opt_mode == 0) {
nscans = 9; /* 1 DC scan for all components */
} else if (cinfo->master->dc_scan_opt_mode == 1) {
nscans = 11; /* 1 DC scan for each component */
} else {
nscans = 10; /* 1 DC scan for luminance and 1 DC scan for chroma */
}
} else {
nscans = 9; /* 1 DC scan for luminance and 1 DC scan for chroma */
nscans = 10; /* 2 DC scans and 8 AC scans */
}
} else {
/* All-purpose script for other color spaces. */