diff options
Diffstat (limited to 'raster/imagescale.c')
| -rw-r--r-- | raster/imagescale.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/raster/imagescale.c b/raster/imagescale.c index bbe20565..7edb0cd2 100644 --- a/raster/imagescale.c +++ b/raster/imagescale.c @@ -212,7 +212,23 @@ fz_scalepixmap(fz_pixmap **dstp, fz_pixmap *src, int xdenom, int ydenom) case 1: srowx = fz_srow1; scolx = fz_scol1; break; case 2: srowx = fz_srow2; scolx = fz_scol2; break; case 4: srowx = fz_srow4; scolx = fz_scol4; break; - case 5: srowx = fz_srow5; scolx = fz_scol5; break; + case 5: srowx = fz_srow5; scolx = fz_scol5; + if (!(xdenom & (xdenom - 1))) + { + unsigned v = xdenom; + xdenom = 0; + while ((v >>= 1)) xdenom++; + srowx = srow5p2; + } + if (!(ydenom & (ydenom - 1))) + { + unsigned v = ydenom2; + ydenom2 = 0; + while ((v >>= 1)) ydenom2++; + scolx = scol5p2; + } + + break; } if (srowx && scolx) |