diff options
Diffstat (limited to 'raster/imageunpack.c')
| -rw-r--r-- | raster/imageunpack.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/raster/imageunpack.c b/raster/imageunpack.c index f66f2aeb..18d59cf5 100644 --- a/raster/imageunpack.c +++ b/raster/imageunpack.c @@ -18,6 +18,7 @@ static void decodetile(fz_pixmap *pix, int skip, float *decode) int n = pix->n; int wh = pix->w * pix->h; int i; + int justinvert = 1; min[0] = 0; max[0] = 255; @@ -28,7 +29,7 @@ static void decodetile(fz_pixmap *pix, int skip, float *decode) min[i] = decode[(i - skip) * 2] * 255; max[i] = decode[(i - skip) * 2 + 1] * 255; sub[i] = max[i] - min[i]; - needed |= (min[i] != 0) | (max[i] != 255); + needed |= (min[i] != 0) | (max[i] != 255); } if (!needed) @@ -42,6 +43,26 @@ static void decodetile(fz_pixmap *pix, int skip, float *decode) } break; case 2: + if (justinvert) { + int hwh = wh / 2; + unsigned *wp = (unsigned *)p; + + assert((((unsigned)wp) & 3) == 0); + + wh = hwh * 2 - wh; + while(hwh--) { + unsigned in = *wp; + unsigned out = in ^ 0xff00ff00; + *wp++ = out; + } + p = (byte *)wp; + while(wh--) { + p[0] = p[0]; + p[1] = 255 - p[1]; + p += 2; + } + } + else while (wh--) { p[0] = min[0] + fz_mul255(sub[0], p[0]); |