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author | Tor Andersson <tor.andersson@artifex.com> | 2011-08-17 19:27:02 +0200 |
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committer | Tor Andersson <tor.andersson@artifex.com> | 2011-08-17 19:27:02 +0200 |
commit | 822ce1df6773e1934f50d035756ecca0f6d4cae1 (patch) | |
tree | 30950a220566092ac35f1367e49b701afa85b3e2 /fitz | |
parent | 4214d2a553522a9ebb5c263368131aea813ebe03 (diff) | |
download | mupdf-822ce1df6773e1934f50d035756ecca0f6d4cae1.tar.xz |
pdfdraw: Add command line option to gamma correct and invert images.
Diffstat (limited to 'fitz')
-rw-r--r-- | fitz/fitz.h | 2 | ||||
-rw-r--r-- | fitz/res_pixmap.c | 38 |
2 files changed, 40 insertions, 0 deletions
diff --git a/fitz/fitz.h b/fitz/fitz.h index 7187094f..dff6b8d4 100644 --- a/fitz/fitz.h +++ b/fitz/fitz.h @@ -625,6 +625,8 @@ void fz_copy_pixmap_rect(fz_pixmap *dest, fz_pixmap *src, fz_bbox r); void fz_premultiply_pixmap(fz_pixmap *pix); fz_pixmap *fz_alpha_from_gray(fz_pixmap *gray, int luminosity); fz_bbox fz_bound_pixmap(fz_pixmap *pix); +void fz_invert_pixmap(fz_pixmap *pix); +void fz_gamma_pixmap(fz_pixmap *pix, float gamma); fz_pixmap *fz_scale_pixmap(fz_pixmap *src, float x, float y, float w, float h); fz_pixmap *fz_scale_pixmap_gridfit(fz_pixmap *src, float x, float y, float w, float h, int gridfit); diff --git a/fitz/res_pixmap.c b/fitz/res_pixmap.c index fdd5c357..83f46526 100644 --- a/fitz/res_pixmap.c +++ b/fitz/res_pixmap.c @@ -251,6 +251,44 @@ fz_alpha_from_gray(fz_pixmap *gray, int luminosity) return alpha; } +void +fz_invert_pixmap(fz_pixmap *pix) +{ + unsigned char *s = pix->samples; + int k, x, y; + + for (y = 0; y < pix->h; y++) + { + for (x = 0; x < pix->w; x++) + { + for (k = 0; k < pix->n - 1; k++) + s[k] = 255 - s[k]; + s += pix->n; + } + } +} + +void +fz_gamma_pixmap(fz_pixmap *pix, float gamma) +{ + unsigned char gamma_map[256]; + unsigned char *s = pix->samples; + int k, x, y; + + for (k = 0; k < 256; k++) + gamma_map[k] = pow(k / 255.0f, gamma) * 255; + + for (y = 0; y < pix->h; y++) + { + for (x = 0; x < pix->w; x++) + { + for (k = 0; k < pix->n - 1; k++) + s[k] = gamma_map[s[k]]; + s += pix->n; + } + } +} + /* * Write pixmap to PNM file (without alpha channel) */ |