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comparison tools/lib64fmts.c @ 1746:dd57dd9430cb

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Improve ECI packed format probing.
author Matti Hamalainen <ccr@tnsp.org>
date Sun, 10 Jun 2018 20:01:03 +0300
parents 2dbb2b63f6b3
children 5e928618fdc8
comparison
equal deleted inserted replaced
1745:2dbb2b63f6b3 1746:dd57dd9430cb
770 } 770 }
771 771
772 772
773 static int fmtProbeECIPacked(const Uint8 *buf, const size_t len, const DMC64ImageFormat *fmt) 773 static int fmtProbeECIPacked(const Uint8 *buf, const size_t len, const DMC64ImageFormat *fmt)
774 { 774 {
775 size_t i, n;
776
775 // XXX TODO: Perhaps count statistics about used byte values 777 // XXX TODO: Perhaps count statistics about used byte values
776 // and compare to value in buf[2] which is the RLE marker 778 // and compare to value in buf[2] which is the RLE marker
777 if (len > 128 && dmCompareAddr16(buf, 0, fmt->addr)) 779 if (len < 128 || !dmCompareAddr16(buf, 0, fmt->addr))
780 return DM_PROBE_SCORE_FALSE;
781
782 for (n = 0, i = 3; i < len; i++)
783 if (buf[i] == buf[2]) n++;
784
785 if (n > 50)
786 return DM_PROBE_SCORE_GOOD;
787 if (n > 25)
778 return DM_PROBE_SCORE_AVG; 788 return DM_PROBE_SCORE_AVG;
779 else 789 if (n > 10)
780 return DM_PROBE_SCORE_FALSE; 790 return DM_PROBE_SCORE_MAYBE;
791
792 return DM_PROBE_SCORE_FALSE;
781 } 793 }
782 794
783 795
784 static int fmtDecodeECIPacked(DMC64Image *img, const DMGrowBuf *buf, const DMC64ImageFormat *fmt) 796 static int fmtDecodeECIPacked(DMC64Image *img, const DMGrowBuf *buf, const DMC64ImageFormat *fmt)
785 { 797 {