diff options
| author | Oliver Fromme <oliver@fromme.com> | 2014-07-03 18:12:12 +0400 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2014-07-04 02:35:21 +0400 |
| commit | d73823286d5f38afc9c656fdeb943148afb35c5e (patch) | |
| tree | 12ec0acb8f4f1ab5ef28da3f4ca2ad86ebaf4f77 /libavcodec/dvdsubdec.c | |
| parent | 3f0a3e9e127d067c5cf65640a44765c1ddd01622 (diff) | |
avcodec/dvdsubdec: fix alpha in debuging code
improve the debugging function for saving subtitles
to PPM files: Actually use the alpha channel.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'libavcodec/dvdsubdec.c')
| -rw-r--r-- | libavcodec/dvdsubdec.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/libavcodec/dvdsubdec.c b/libavcodec/dvdsubdec.c index 6b94292c04..39b0e25a13 100644 --- a/libavcodec/dvdsubdec.c +++ b/libavcodec/dvdsubdec.c @@ -462,10 +462,13 @@ static int find_smallest_bounding_rectangle(AVSubtitle *s) } #ifdef DEBUG +#define ALPHA_MIX(A,BACK,FORE) (((255-(A)) * (BACK) + (A) * (FORE)) / 255) static void ppm_save(const char *filename, uint8_t *bitmap, int w, int h, uint32_t *rgba_palette) { - int x, y, v; + int x, y, alpha; + uint32_t v; + int back[3] = {0, 255, 0}; /* green background */ FILE *f; f = fopen(filename, "w"); @@ -480,9 +483,10 @@ static void ppm_save(const char *filename, uint8_t *bitmap, int w, int h, for(y = 0; y < h; y++) { for(x = 0; x < w; x++) { v = rgba_palette[bitmap[y * w + x]]; - putc((v >> 16) & 0xff, f); - putc((v >> 8) & 0xff, f); - putc((v >> 0) & 0xff, f); + alpha = v >> 24; + putc(ALPHA_MIX(alpha, back[0], (v >> 16) & 0xff), f); + putc(ALPHA_MIX(alpha, back[1], (v >> 8) & 0xff), f); + putc(ALPHA_MIX(alpha, back[2], (v >> 0) & 0xff), f); } } fclose(f); @@ -552,7 +556,7 @@ static int dvdsub_decode(AVCodecContext *avctx, sub->start_display_time, sub->end_display_time); ppm_save(ppm_name, sub->rects[0]->pict.data[0], - sub->rects[0]->w, sub->rects[0]->h, sub->rects[0]->pict.data[1]); + sub->rects[0]->w, sub->rects[0]->h, (uint32_t*) sub->rects[0]->pict.data[1]); } #endif |