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Write 32bit palette to Targa files.

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Current ImageMagick fails to read such files,
therefore only write the 32bit palette if the
palette actually contains any transparency
information.
This commit is contained in:
Carl Eugen Hoyos 2012-10-09 10:13:14 +02:00
parent 1e83e6ad7a
commit 61a9f099b7
1 changed files with 14 additions and 3 deletions
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17
libavcodec/targaenc.c
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@ -103,16 +103,27 @@ static int targa_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
avctx->bits_per_coded_sample = av_get_bits_per_pixel(&av_pix_fmt_descriptors[avctx->pix_fmt]);
switch(avctx->pix_fmt) {
case AV_PIX_FMT_PAL8:
case AV_PIX_FMT_PAL8: {
int pal_bpp = 24; /* Only write 32bit palette if there is transparency information */
for (i = 0; i < 256; i++)
if (AV_RN32(p->data[1] + 4 * i) >> 24 != 0xFF) {
pal_bpp = 32;
break;
}
pkt->data[1] = 1; /* palette present */
pkt->data[2] = TGA_PAL; /* uncompressed palettised image */
pkt->data[6] = 1; /* palette contains 256 entries */
pkt->data[7] = 24; /* palette contains 24 bit entries */
pkt->data[7] = pal_bpp; /* palette contains pal_bpp bit entries */
pkt->data[16] = 8; /* bpp */
for (i = 0; i < 256; i++)
if (pal_bpp == 32) {
AV_WL32(pkt->data + 18 + 4 * i, *(uint32_t *)(p->data[1] + i * 4));
} else {
AV_WL24(pkt->data + 18 + 3 * i, *(uint32_t *)(p->data[1] + i * 4));
out += 256 * 3; /* skip past the palette we just output */
}
out += 32 * pal_bpp; /* skip past the palette we just output */
break;
}
case AV_PIX_FMT_GRAY8:
pkt->data[2] = TGA_BW; /* uncompressed grayscale image */
avctx->bits_per_coded_sample = 0x28;