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export alpha channel (if present) when dumping to PGM format

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Change-Id: Ica1818937fa03b29a749887d28f49fe675c8b1db
This commit is contained in:
Pascal Massimino 2011-07-07 16:08:15 -07:00
parent 0805706252
commit 5142a0be3a
1 changed files with 7 additions and 1 deletions
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8
examples/cwebp.c
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@ -573,7 +573,8 @@ static int DumpPicture(const WebPPicture* const picture, const char* PGM_name) {
const int uv_width = (picture->width + 1) / 2;
const int uv_height = (picture->height + 1) / 2;
const int stride = (picture->width + 1) & ~1;
const int height = picture->height + uv_height;
const int alpha_height = picture->a ? picture->height : 0;
const int height = picture->height + uv_height + alpha_height;
FILE* const f = fopen(PGM_name, "wb");
if (!f) return 0;
fprintf(f, "P5\n%d %d\n255\n", stride, height);
@ -588,6 +589,11 @@ static int DumpPicture(const WebPPicture* const picture, const char* PGM_name) {
if (fwrite(picture->v + y * picture->uv_stride, uv_width, 1, f) != 1)
return 0;
}
for (y = 0; y < alpha_height; ++y) {
if (fwrite(picture->a + y * picture->a_stride, picture->width, 1, f) != 1)
return 0;
if (picture->width & 1) fputc(0, f); // pad
}
fclose(f);
return 1;
}