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pngdec: relax condition for setting monoblack pixel format 

Ignore color_type information for setting the monoblack pixel format,
only rely on bit_depth.

In particular: fix Test_1bpp_grayscale.png from issue #172.

This may work fine for some broken encoder, and not for others.
This commit is contained in:
Stefano Sabatini 2011-05-16 01:51:04 +02:00
parent 85eedcf6ff
commit 68bed67d2e
1 changed files with 2 additions and 3 deletions
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5
libavcodec/pngdec.c
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@ -467,8 +467,7 @@ static int decode_frame(AVCodecContext *avctx,
} else if (s->bit_depth == 16 &&
s->color_type == PNG_COLOR_TYPE_RGB) {
avctx->pix_fmt = PIX_FMT_RGB48BE;
} else if (s->bit_depth == 1 &&
s->color_type == PNG_COLOR_TYPE_GRAY) {
} else if (s->bit_depth == 1) {
avctx->pix_fmt = PIX_FMT_MONOBLACK;
} else if (s->color_type == PNG_COLOR_TYPE_PALETTE) {
avctx->pix_fmt = PIX_FMT_PAL8;
@ -504,7 +503,7 @@ static int decode_frame(AVCodecContext *avctx,
s->image_buf = p->data[0];
s->image_linesize = p->linesize[0];
/* copy the palette if needed */
if (s->color_type == PNG_COLOR_TYPE_PALETTE)
if (avctx->pix_fmt == PIX_FMT_PAL8)
memcpy(p->data[1], s->palette, 256 * sizeof(uint32_t));
/* empty row is used if differencing to the first row */
s->last_row = av_mallocz(s->row_size);