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#include "fitz.h"
#include "mupdf.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)
{
char buf[80];
int len = fz_strlcpy(buf, msg, sizeof buf);
if (len > 0) buf[len-1] = 0;
pdf_logimage("%s\n", buf);
}
fz_error
pdf_loadjpximage(pdf_image **imgp, pdf_xref *xref, fz_obj *rdb, fz_obj *dict)
{
pdf_image *img;
opj_event_mgr_t evtmgr;
opj_dparameters_t params;
opj_dinfo_t *info;
opj_cio_t *cio;
opj_image_t *jpx;
fz_error error;
fz_buffer *buf;
unsigned char *p;
int format;
int n, w, h, depth, sgnd;
int x, y, k, v;
error = pdf_loadstream(&buf, xref, fz_tonum(dict), fz_togen(dict));
if (error)
return fz_throw("read error in jpx image");
if (buf->len < 2)
{
fz_dropbuffer(buf);
return fz_throw("not enough data to determine image format");
}
/* Check for SOC marker -- if found we have a bare J2K stream */
if (buf->data[0] == 0xFF && buf->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, buf->data, buf->len);
jpx = opj_decode(info, cio);
opj_cio_close(cio);
opj_destroy_decompress(info);
fz_dropbuffer(buf);
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;
img = fz_malloc(sizeof(pdf_image));
memset(img, 0, sizeof(pdf_image));
img->refs = 1;
img->w = w;
img->h = h;
img->bpc = 8;
img->n = n;
img->stride = w * n;
img->samples = fz_malloc(w * n * h);
switch (n)
{
default:
case 1: img->colorspace = fz_devicegray; break;
case 3: img->colorspace = fz_devicergb; break;
case 4: img->colorspace = fz_devicecmyk; break;
}
for (k = 0; k < n; k++)
{
img->decode[k * 2] = 0;
img->decode[k * 2 + 1] = 1;
}
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;
}
}
}
opj_image_destroy(jpx);
*imgp = img;
return fz_okay;
}
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