diff options
Diffstat (limited to 'fitz')
| -rw-r--r-- | fitz/res_pixmap.c | 30 |
1 files changed, 24 insertions, 6 deletions
diff --git a/fitz/res_pixmap.c b/fitz/res_pixmap.c index b37b7a3e..93fdb307 100644 --- a/fitz/res_pixmap.c +++ b/fitz/res_pixmap.c @@ -103,14 +103,32 @@ fz_premultiplypixmap(fz_pixmap *pix) unsigned char *s = pix->samples; unsigned char a; int k, x, y; - for (y = 0; y < pix->h; y++) + + /* special case for CMYK (subtractive colors) */ + if (pix->n == 5) + { + for (y = 0; y < pix->h; y++) + { + for (x = 0; x < pix->w; x++) + { + a = s[pix->n - 1]; + for (k = 0; k < pix->n - 1; k++) + s[k] = 255 - fz_mul255(255 - s[k], a); + s += pix->n; + } + } + } + else { - for (x = 0; x < pix->w; x++) + for (y = 0; y < pix->h; y++) { - a = s[pix->n - 1]; - for (k = 0; k < pix->n - 1; k++) - s[k] = fz_mul255(s[k], a); - s += pix->n; + for (x = 0; x < pix->w; x++) + { + a = s[pix->n - 1]; + for (k = 0; k < pix->n - 1; k++) + s[k] = fz_mul255(s[k], a); + s += pix->n; + } } } } |