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Add a couple of unpackers.

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This commit is contained in:
Alastair Houghton 2014-03-14 16:38:30 +00:00
parent 168acabcb0
commit 5853d2aed0
1 changed files with 57 additions and 0 deletions
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57
libImaging/Jpeg2KDecode.c
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@ -410,6 +410,60 @@ j2ku_srgba_rgba(opj_image_t *in, const JPEG2KTILEINFO *tileinfo,
}
}
static void
j2ku_sycca_rgba(opj_image_t *in, const JPEG2KTILEINFO *tileinfo,
const UINT8 *tiledata, Imaging im)
{
unsigned x0 = tileinfo->x0, y0 = tileinfo->y0;
unsigned w = tileinfo->x1 - tileinfo->x0;
unsigned h = tileinfo->y1 - tileinfo->y0;
int shifts[4], offsets[4], csiz[4];
const UINT8 *cdata[4];
const UINT8 *cptr = tiledata;
unsigned n, x, y;
for (n = 0; n < 4; ++n) {
cdata[n] = cptr;
shifts[n] = 8 - in->comps[n].prec;
offsets[n] = in->comps[n].sgnd ? 1 << (in->comps[n].prec - 1) : 0;
csiz[n] = (in->comps[n].prec + 7) >> 3;
if (csiz[n] == 3)
csiz[n] = 4;
if (shifts[n] < 0)
offsets[n] += 1 << (-shifts[n] - 1);
cptr += csiz[n] * w * h;
}
for (y = 0; y < h; ++y) {
const UINT8 *data[4];
UINT8 *row = (UINT8 *)im->image[y0 + y] + x0 * 4;
UINT8 *row_start = row;
for (n = 0; n < 4; ++n)
data[n] = &cdata[n][csiz[n] * y * w];
for (x = 0; x < w; ++x) {
for (n = 0; n < 4; ++n) {
UINT32 word;
switch (csiz[n]) {
case 1: word = *data[n]++; break;
case 2: word = *(const UINT16 *)data[n]; data[n] += 2; break;
case 4: word = *(const UINT32 *)data[n]; data[n] += 4; break;
}
row[n] = j2ku_shift(offsets[n] + word, shifts[n]);
}
row += 4;
}
ImagingConvertYCbCr2RGB(row_start, row_start, w);
}
}
static const struct j2k_decode_unpacker j2k_unpackers[] = {
{ "L", OPJ_CLRSPC_GRAY, 1, j2ku_gray_l },
{ "LA", OPJ_CLRSPC_GRAY, 2, j2ku_graya_la },
@ -417,11 +471,14 @@ static const struct j2k_decode_unpacker j2k_unpackers[] = {
{ "RGB", OPJ_CLRSPC_GRAY, 2, j2ku_gray_rgb },
{ "RGB", OPJ_CLRSPC_SRGB, 3, j2ku_srgb_rgb },
{ "RGB", OPJ_CLRSPC_SYCC, 3, j2ku_sycc_rgb },
{ "RGB", OPJ_CLRSPC_SRGB, 4, j2ku_srgb_rgb },
{ "RGB", OPJ_CLRSPC_SYCC, 4, j2ku_sycc_rgb },
{ "RGBA", OPJ_CLRSPC_GRAY, 1, j2ku_gray_rgb },
{ "RGBA", OPJ_CLRSPC_GRAY, 2, j2ku_graya_la },
{ "RGBA", OPJ_CLRSPC_SRGB, 3, j2ku_srgb_rgb },
{ "RGBA", OPJ_CLRSPC_SYCC, 3, j2ku_sycc_rgb },
{ "RGBA", OPJ_CLRSPC_SRGB, 4, j2ku_srgba_rgba },
{ "RGBA", OPJ_CLRSPC_SYCC, 4, j2ku_sycca_rgba },
};
/* -------------------------------------------------------------------- */