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zimg: add pal8 unpacker

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Some pngs are paletted, so this is vaguely interesting.
This commit is contained in:
wm4 2020-02-10 19:01:21 +01:00
parent d699893dbd
commit 8c2179becf
1 changed files with 39 additions and 0 deletions
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39
video/zimg.c
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@ -411,6 +411,30 @@ static int packed_repack(void *user, unsigned i, unsigned x0, unsigned x1)
return 0;
}
static int unpack_pal(void *user, unsigned i, unsigned x0, unsigned x1)
{
struct mp_zimg_repack *r = user;
uint8_t *src = (void *)(r->mpi->planes[0] + r->mpi->stride[0] * (ptrdiff_t)i);
uint32_t *pal = (void *)r->mpi->planes[1];
uint8_t *dst[4] = {0};
for (int p = 0; p < r->num_planes; p++) {
dst[p] = r->tmp->planes[p] +
r->tmp->stride[p] * (ptrdiff_t)(i & r->zmask[p]);
}
for (int x = x0; x < x1; x++) {
uint32_t c = pal[src[x]];
dst[0][x] = (c >> 8) & 0xFF; // G
dst[1][x] = (c >> 0) & 0xFF; // B
dst[2][x] = (c >> 16) & 0xFF; // R
dst[3][x] = (c >> 24) & 0xFF; // A
}
return 0;
}
static int repack_nv(void *user, unsigned i, unsigned x0, unsigned x1)
{
struct mp_zimg_repack *r = user;
@ -574,6 +598,21 @@ static void setup_misc_packer(struct mp_zimg_repack *r)
static int c_order[] = {3, 2, 1};
for (int n = 0; n < 3; n++)
r->components[n] = c_order[n] - 1;
} else if (r->zimgfmt == IMGFMT_PAL8 && !r->pack) {
struct mp_regular_imgfmt gbrap = {
.component_type = MP_COMPONENT_TYPE_UINT,
.forced_csp = MP_CSP_RGB,
.component_size = 1,
.num_planes = 4,
.planes = { {1, {2}}, {1, {3}}, {1, {1}}, {1, {4}}, },
.chroma_w = 1,
.chroma_h = 1,
};
int grap_fmt = mp_find_regular_imgfmt(&gbrap);
if (!grap_fmt)
return;
r->zimgfmt = grap_fmt;
r->repack = unpack_pal;
}
}