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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>
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3f0a3e9e12
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d73823286d
@ -462,10 +462,13 @@ static int find_smallest_bounding_rectangle(AVSubtitle *s)
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}
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#ifdef DEBUG
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#define ALPHA_MIX(A,BACK,FORE) (((255-(A)) * (BACK) + (A) * (FORE)) / 255)
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static void ppm_save(const char *filename, uint8_t *bitmap, int w, int h,
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uint32_t *rgba_palette)
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{
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int x, y, v;
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int x, y, alpha;
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uint32_t v;
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int back[3] = {0, 255, 0}; /* green background */
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FILE *f;
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f = fopen(filename, "w");
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@ -480,9 +483,10 @@ static void ppm_save(const char *filename, uint8_t *bitmap, int w, int h,
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for(y = 0; y < h; y++) {
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for(x = 0; x < w; x++) {
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v = rgba_palette[bitmap[y * w + x]];
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putc((v >> 16) & 0xff, f);
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putc((v >> 8) & 0xff, f);
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putc((v >> 0) & 0xff, f);
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alpha = v >> 24;
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putc(ALPHA_MIX(alpha, back[0], (v >> 16) & 0xff), f);
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putc(ALPHA_MIX(alpha, back[1], (v >> 8) & 0xff), f);
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putc(ALPHA_MIX(alpha, back[2], (v >> 0) & 0xff), f);
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}
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}
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fclose(f);
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@ -552,7 +556,7 @@ static int dvdsub_decode(AVCodecContext *avctx,
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sub->start_display_time,
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sub->end_display_time);
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ppm_save(ppm_name, sub->rects[0]->pict.data[0],
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sub->rects[0]->w, sub->rects[0]->h, sub->rects[0]->pict.data[1]);
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sub->rects[0]->w, sub->rects[0]->h, (uint32_t*) sub->rects[0]->pict.data[1]);
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}
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#endif
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