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#include "fitz.h"
#define OPJ_STATIC
#include <openjpeg.h>
typedef struct fz_jpxd_s fz_jpxd;
struct fz_jpxd_s
{
fz_filter super;
opj_event_mgr_t evtmgr;
opj_dparameters_t params;
opj_dinfo_t *info;
opj_image_t *image;
int stage;
int x, y, k;
};
static void fz_opj_error_callback(const char *msg, void *client_data)
{
fprintf(stderr, "openjpeg error: %s", msg);
}
static void fz_opj_warning_callback(const char *msg, void *client_data)
{
fprintf(stderr, "openjpeg warning: %s", msg);
}
static void fz_opj_info_callback(const char *msg, void *client_data)
{
/* fprintf(stdout, "openjpeg info: %s", msg); */
}
fz_filter *
fz_newjpxd(fz_obj *params)
{
FZ_NEWFILTER(fz_jpxd, d, jpxd);
d->info = nil;
d->image = nil;
d->stage = 0;
d->x = 0;
d->y = 0;
d->k = 0;
return (fz_filter*)d;
}
void
fz_dropjpxd(fz_filter *filter)
{
fz_jpxd *d = (fz_jpxd*)filter;
if (d->image)
opj_image_destroy(d->image);
if (d->info)
opj_destroy_decompress(d->info);
}
fz_error
fz_processjpxd(fz_filter *filter, fz_buffer *in, fz_buffer *out)
{
fz_jpxd *d = (fz_jpxd*)filter;
int format;
int n, w, h, depth, sgnd;
int k, v;
opj_cio_t *cio;
switch (d->stage)
{
case 0: goto input;
case 1: goto decode;
case 2: goto output;
}
input:
/* Wait until we have the entire file in the input buffer */
if (!in->eof)
return fz_ioneedin;
d->stage = 1;
decode:
memset(&d->evtmgr, 0, sizeof(d->evtmgr));
d->evtmgr.error_handler = fz_opj_error_callback;
d->evtmgr.warning_handler = fz_opj_warning_callback;
d->evtmgr.info_handler = fz_opj_info_callback;
opj_set_default_decoder_parameters(&d->params);
if (in->wp - in->rp < 2)
return fz_throw("not enough data to determine image format");
/* Check for SOC marker -- if found we have a bare J2K stream */
if (in->rp[0] == 0xFF && in->rp[1] == 0x4F)
format = CODEC_J2K;
else
format = CODEC_JP2;
d->info = opj_create_decompress(format);
if (!d->info)
fz_warn("assert: opj_create_decompress failed");
opj_set_event_mgr((opj_common_ptr)d->info, &d->evtmgr, stderr);
opj_setup_decoder(d->info, &d->params);
cio = opj_cio_open((opj_common_ptr)d->info, in->rp, in->wp - in->rp);
in->rp = in->wp;
d->image = opj_decode(d->info, cio);
if (!d->image)
{
opj_cio_close(cio);
return fz_throw("opj_decode failed");
}
opj_cio_close(cio);
for (k = 1; k < d->image->numcomps; k++)
{
if (d->image->comps[k].w != d->image->comps[0].w)
return fz_throw("image components have different width");
if (d->image->comps[k].h != d->image->comps[0].h)
return fz_throw("image components have different height");
if (d->image->comps[k].prec != d->image->comps[0].prec)
return fz_throw("image components have different precision");
}
d->stage = 2;
output:
n = d->image->numcomps;
w = d->image->comps[0].w;
h = d->image->comps[0].h;
depth = d->image->comps[0].prec;
sgnd = d->image->comps[0].sgnd;
while (d->y < h)
{
while (d->x < w)
{
while (d->k < n)
{
if (out->wp == out->ep)
return fz_ioneedout;
v = d->image->comps[d->k].data[d->y * w + d->x];
if (sgnd)
v = v + (1 << (depth - 1));
if (depth > 8)
v = v >> (depth - 8);
*out->wp++ = v;
d->k ++;
}
d->x ++;
d->k = 0;
}
d->y ++;
d->x = 0;
}
return fz_iodone;
}
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