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#include "fitz.h"
#define OPJ_STATIC
#include <openjpeg.h>
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(stderr, "openjpeg info: %s", msg); */
}
fz_error
fz_loadjpximage(fz_pixmap **imgp, unsigned char *data, int size)
{
fz_pixmap *img;
opj_event_mgr_t evtmgr;
opj_dparameters_t params;
opj_dinfo_t *info;
opj_cio_t *cio;
opj_image_t *jpx;
fz_colorspace *colorspace;
unsigned char *p;
int format;
int n, w, h, depth, sgnd;
int x, y, k, v;
if (size < 2)
return fz_throw("not enough data to determine image format");
/* Check for SOC marker -- if found we have a bare J2K stream */
if (data[0] == 0xFF && data[1] == 0x4F)
format = CODEC_J2K;
else
format = CODEC_JP2;
memset(&evtmgr, 0, sizeof(evtmgr));
evtmgr.error_handler = fz_opj_error_callback;
evtmgr.warning_handler = fz_opj_warning_callback;
evtmgr.info_handler = fz_opj_info_callback;
opj_set_default_decoder_parameters(¶ms);
info = opj_create_decompress(format);
opj_set_event_mgr((opj_common_ptr)info, &evtmgr, stderr);
opj_setup_decoder(info, ¶ms);
cio = opj_cio_open((opj_common_ptr)info, data, size);
jpx = opj_decode(info, cio);
opj_cio_close(cio);
opj_destroy_decompress(info);
if (!jpx)
return fz_throw("opj_decode failed");
for (k = 1; k < jpx->numcomps; k++)
{
if (jpx->comps[k].w != jpx->comps[0].w)
return fz_throw("image components have different width");
if (jpx->comps[k].h != jpx->comps[0].h)
return fz_throw("image components have different height");
if (jpx->comps[k].prec != jpx->comps[0].prec)
return fz_throw("image components have different precision");
}
n = jpx->numcomps;
w = jpx->comps[0].w;
h = jpx->comps[0].h;
depth = jpx->comps[0].prec;
sgnd = jpx->comps[0].sgnd;
switch (n)
{
case 1: colorspace = fz_devicegray; break;
case 3: colorspace = fz_devicergb; break;
case 4: colorspace = fz_devicecmyk; break;
default:
/* TODO: SMaskInData */
opj_image_destroy(jpx);
return fz_throw("unknown jpx colorspace (%d components)", n);
}
img = fz_newpixmap(colorspace, 0, 0, w, h);
p = img->samples;
for (y = 0; y < h; y++)
{
for (x = 0; x < w; x++)
{
for (k = 0; k < n; k++)
{
v = jpx->comps[k].data[y * w + x];
if (sgnd)
v = v + (1 << (depth - 1));
if (depth > 8)
v = v >> (depth - 8);
*p++ = v;
}
*p++ = 255; /* TODO: SMaskInData */
}
}
opj_image_destroy(jpx);
*imgp = img;
return fz_okay;
}
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