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tiff: Improve grayscale support 

Only use PAL8 if palette is present, else use GRAY8 for pixfmt.

Instead of simulating a grayscale palette, use real grayscale pixels, if no
palette is actually defined.

Signed-off-by: Diego Elio Pettenò <flameeyes@flameeyes.eu>
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
This commit is contained in:
Diego Elio Pettenò 2014-08-09 14:19:45 +01:00 committed by Luca Barbato
parent fb1ddcdc8f
commit 2597a842a0
1 changed files with 3 additions and 11 deletions
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14
libavcodec/tiff.c
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@ -246,15 +246,14 @@ static int tiff_unpack_strip(TiffContext *s, uint8_t *dst, int stride,
static int init_image(TiffContext *s, AVFrame *frame)
{
int i, ret;
uint32_t *pal;
int ret;
switch (s->bpp * 10 + s->bppcount) {
case 11:
s->avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
break;
case 81:
s->avctx->pix_fmt = AV_PIX_FMT_PAL8;
s->avctx->pix_fmt = s->palette_is_set ? AV_PIX_FMT_PAL8 : AV_PIX_FMT_GRAY8;
break;
case 243:
s->avctx->pix_fmt = AV_PIX_FMT_RGB24;
@ -290,14 +289,7 @@ static int init_image(TiffContext *s, AVFrame *frame)
return ret;
}
if (s->avctx->pix_fmt == AV_PIX_FMT_PAL8) {
if (s->palette_is_set) {
memcpy(frame->data[1], s->palette, sizeof(s->palette));
} else {
/* make default grayscale pal */
pal = (uint32_t *) frame->data[1];
for (i = 0; i < 256; i++)
pal[i] = i * 0x010101;
}
memcpy(frame->data[1], s->palette, sizeof(s->palette));
}
return 0;
}