diff options
| -rw-r--r-- | source/fitz/pixmap.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/source/fitz/pixmap.c b/source/fitz/pixmap.c index a8c7da4c..1d985fa9 100644 --- a/source/fitz/pixmap.c +++ b/source/fitz/pixmap.c @@ -781,16 +781,18 @@ fz_invert_pixmap(fz_context *ctx, fz_pixmap *pix) { unsigned char *s = pix->samples; int k, x, y; + int n1 = pix->n - pix->alpha; + int n = pix->n; for (y = 0; y < pix->h; y++) { for (x = 0; x < pix->w; x++) { - for (k = 0; k < pix->n - 1; k++) + for (k = 0; k < n1; k++) s[k] = 255 - s[k]; - s += pix->n; + s += n; } - s += pix->stride - pix->w * pix->n; + s += pix->stride - pix->w * n; } } |