diff options
Diffstat (limited to 'fitz/res_pixmap.c')
| -rw-r--r-- | fitz/res_pixmap.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/fitz/res_pixmap.c b/fitz/res_pixmap.c index 1b254f36..fc40135e 100644 --- a/fitz/res_pixmap.c +++ b/fitz/res_pixmap.c @@ -1,4 +1,4 @@ -#include "fitz.h" +#include "fitz-internal.h" fz_pixmap * fz_keep_pixmap(fz_context *ctx, fz_pixmap *pix) @@ -282,6 +282,27 @@ fz_invert_pixmap(fz_context *ctx, fz_pixmap *pix) } } +void fz_invert_pixmap_rect(fz_pixmap *image, fz_bbox rect) +{ + unsigned char *p; + int x, y, n; + + int x0 = CLAMP(rect.x0 - image->x, 0, image->w - 1); + int x1 = CLAMP(rect.x1 - image->x, 0, image->w - 1); + int y0 = CLAMP(rect.y0 - image->y, 0, image->h - 1); + int y1 = CLAMP(rect.y1 - image->y, 0, image->h - 1); + + for (y = y0; y < y1; y++) + { + p = image->samples + (y * image->w + x0) * image->n; + for (x = x0; x < x1; x++) + { + for (n = image->n; n > 0; n--, p++) + *p = 255 - *p; + } + } +} + void fz_gamma_pixmap(fz_context *ctx, fz_pixmap *pix, float gamma) { |