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#include "fitz_base.h"
#include "fitz_stream.h"
/* TODO: bpc */
/*
* We use the Jasper JPEG2000 coder for now.
*/
#include <jasper/jasper.h>
static char *colorspacename(jas_clrspc_t clrspc)
{
switch (jas_clrspc_fam(clrspc))
{
case JAS_CLRSPC_FAM_UNKNOWN: return "Unknown";
case JAS_CLRSPC_FAM_XYZ: return "XYZ";
case JAS_CLRSPC_FAM_LAB: return "Lab";
case JAS_CLRSPC_FAM_GRAY: return "Gray";
case JAS_CLRSPC_FAM_RGB: return "RGB";
case JAS_CLRSPC_FAM_YCBCR: return "YCbCr";
}
return "Unknown";
}
typedef struct fz_jpxd_s fz_jpxd;
struct fz_jpxd_s
{
fz_filter super;
jas_stream_t *stream;
jas_image_t *image;
int offset;
int stage;
};
fz_error
fz_newjpxd(fz_filter **fp, fz_obj *params)
{
int err;
FZ_NEWFILTER(fz_jpxd, d, jpxd);
err = jas_init();
if (err)
{
fz_free(d);
return fz_throw("jasper error: jas_init()");
}
d->stream = jas_stream_memopen(nil, 0);
if (!d->stream)
{
fz_free(d);
return fz_throw("jasper error: jas_stream_memopen()");
}
d->image = nil;
d->offset = 0;
d->stage = 0;
return fz_okay;
}
void
fz_dropjpxd(fz_filter *filter)
{
fz_jpxd *d = (fz_jpxd*)filter;
if (d->stream) jas_stream_close(d->stream);
if (d->image) jas_image_destroy(d->image);
}
fz_error
fz_processjpxd(fz_filter *filter, fz_buffer *in, fz_buffer *out)
{
fz_jpxd *d = (fz_jpxd*)filter;
int n, bpc, w, h;
int i, x, y;
switch (d->stage)
{
case 0: goto input;
case 1: goto decode;
case 2: goto output;
}
input:
while (in->rp < in->wp)
{
n = jas_stream_write(d->stream, in->rp, in->wp - in->rp);
in->rp += n;
}
if (!in->eof)
return fz_ioneedin;
d->stage = 1;
decode:
jas_stream_seek(d->stream, 0, 0);
d->image = jas_image_decode(d->stream, -1, 0);
if (!d->image)
return fz_throw("jasper error: jas_image_decode()");
fprintf(stderr, "P%c\n# JPX %d x %d n=%d bpc=%d colorspace=%04x %s\n%d %d\n%d\n",
jas_image_numcmpts(d->image) == 1 ? '5' : '6',
jas_image_width(d->image),
jas_image_height(d->image),
jas_image_numcmpts(d->image),
jas_image_cmptprec(d->image, 0),
jas_image_clrspc(d->image),
colorspacename(jas_image_clrspc(d->image)),
jas_image_width(d->image),
jas_image_height(d->image),
(1 << jas_image_cmptprec(d->image, 0)) - 1);
d->stage = 2;
output:
w = jas_image_width(d->image);
h = jas_image_height(d->image);
n = jas_image_numcmpts(d->image);
bpc = jas_image_cmptprec(d->image, 0); /* use precision of first component for all... */
while (d->offset < w * h)
{
y = d->offset / w;
x = d->offset - y * w;
/* FIXME bpc != 8 */
if (out->wp + n >= out->ep)
return fz_ioneedout;
for (i = 0; i < n; i++)
*out->wp++ = jas_image_readcmptsample(d->image, i, x, y);
d->offset ++;
}
return fz_iodone;
}
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