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Resolve mismatch with jpgcrush

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Add early termination to search for best Al parameter
This commit is contained in:
fbossen
2014-02-15 09:13:03 -05:00
parent dff12f6b87
commit e64d7453e9
1 changed files with 7 additions and 3 deletions
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8
jcmaster.c
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@@ -591,8 +591,10 @@ select_scans (j_compress_ptr cinfo, int next_scan_number)
for (i = 0; i < Al; i++) for (i = 0; i < Al; i++)
size[Al] += cinfo->scan_size[3 + 2*cinfo->Al_max_luma + i]; size[Al] += cinfo->scan_size[3 + 2*cinfo->Al_max_luma + i];
if (size[Al] < size[cinfo->best_Al]) if (Al == 0 || size[Al] < size[cinfo->best_Al])
cinfo->best_Al = Al; cinfo->best_Al = Al;
else
break;
} }
/* HACK! casting a const to a non-const :-( */ /* HACK! casting a const to a non-const :-( */
@@ -673,8 +675,10 @@ select_scans (j_compress_ptr cinfo, int next_scan_number)
size[Al] += cinfo->scan_size[base_scan_idx + 5 + 4*cinfo->Al_max_chroma + 2*i]; size[Al] += cinfo->scan_size[base_scan_idx + 5 + 4*cinfo->Al_max_chroma + 2*i];
} }
if (size[Al] < size[cinfo->best_Al]) if (Al == 0 || size[Al] < size[cinfo->best_Al])
cinfo->best_Al = Al; cinfo->best_Al = Al;
else
break;
} }
jpeg_scan_info *scanptr = (jpeg_scan_info *)&cinfo->scan_info[next_scan_number]; jpeg_scan_info *scanptr = (jpeg_scan_info *)&cinfo->scan_info[next_scan_number];