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src/Source/LibOpenJPEG/jp2.c  view on Meta::CPAN

	 * inside a JP2 Header box' :
	*/
	if(jp2->color.jp2_pclr->cmap) {
		opj_event_msg(p_manager, EVT_ERROR, "Only one CMAP box is allowed.\n");
		return OPJ_FALSE;
	}

	nr_channels = jp2->color.jp2_pclr->nr_channels;
	if (p_cmap_header_size < (OPJ_UINT32)nr_channels * 4) {
		opj_event_msg(p_manager, EVT_ERROR, "Insufficient data for CMAP box.\n");
		return OPJ_FALSE;
	}

	cmap = (opj_jp2_cmap_comp_t*) opj_malloc(nr_channels * sizeof(opj_jp2_cmap_comp_t));
    if (!cmap)
        return OPJ_FALSE;


	for(i = 0; i < nr_channels; ++i) {
		opj_read_bytes(p_cmap_header_data, &l_value, 2);			/* CMP^i */
		p_cmap_header_data +=2;
		cmap[i].cmp = (OPJ_UINT16) l_value;

		opj_read_bytes(p_cmap_header_data, &l_value, 1);			/* MTYP^i */
		++p_cmap_header_data;
		cmap[i].mtyp = (OPJ_BYTE) l_value;

		opj_read_bytes(p_cmap_header_data, &l_value, 1);			/* PCOL^i */
		++p_cmap_header_data;
		cmap[i].pcol = (OPJ_BYTE) l_value;
	}

	jp2->color.jp2_pclr->cmap = cmap;

	return OPJ_TRUE;
}

void opj_jp2_apply_cdef(opj_image_t *image, opj_jp2_color_t *color)
{
	opj_jp2_cdef_info_t *info;
	OPJ_UINT16 i, n, cn, asoc, acn;

	info = color->jp2_cdef->info;
	n = color->jp2_cdef->n;

  for(i = 0; i < n; ++i)
    {
    /* WATCH: acn = asoc - 1 ! */
    asoc = info[i].asoc;
    if(asoc == 0 || asoc == 65535)
      {
      if (i < image->numcomps)
        image->comps[i].alpha = info[i].typ;
      continue;
      }

    cn = info[i].cn; 
    acn = (OPJ_UINT16)(asoc - 1);
    if( cn >= image->numcomps || acn >= image->numcomps )
      {
      fprintf(stderr, "cn=%d, acn=%d, numcomps=%d\n", cn, acn, image->numcomps);
      continue;
      }

		if(cn != acn)
		{
			opj_image_comp_t saved;

			memcpy(&saved, &image->comps[cn], sizeof(opj_image_comp_t));
			memcpy(&image->comps[cn], &image->comps[acn], sizeof(opj_image_comp_t));
			memcpy(&image->comps[acn], &saved, sizeof(opj_image_comp_t));

			info[i].asoc = (OPJ_UINT16)(cn + 1);
			info[acn].asoc = (OPJ_UINT16)(info[acn].cn + 1);
		}

		image->comps[cn].alpha = info[i].typ;
	}

	if(color->jp2_cdef->info) opj_free(color->jp2_cdef->info);

	opj_free(color->jp2_cdef); color->jp2_cdef = NULL;

}/* jp2_apply_cdef() */

OPJ_BOOL opj_jp2_read_cdef(	opj_jp2_t * jp2,
                            OPJ_BYTE * p_cdef_header_data,
							OPJ_UINT32 p_cdef_header_size,
							opj_event_mgr_t * p_manager
                            )
{
	opj_jp2_cdef_info_t *cdef_info;
	OPJ_UINT16 i;
	OPJ_UINT32 l_value;

	/* preconditions */
	assert(jp2 != 00);
	assert(p_cdef_header_data != 00);
	assert(p_manager != 00);
    (void)p_cdef_header_size;

	/* Part 1, I.5.3.6: 'The shall be at most one Channel Definition box
	 * inside a JP2 Header box.'*/
	if(jp2->color.jp2_cdef) return OPJ_FALSE;

	if (p_cdef_header_size < 2) {
		opj_event_msg(p_manager, EVT_ERROR, "Insufficient data for CDEF box.\n");
		return OPJ_FALSE;
	}

	opj_read_bytes(p_cdef_header_data,&l_value ,2);			/* N */
	p_cdef_header_data+= 2;

	if ( (OPJ_UINT16)l_value == 0){ /* szukw000: FIXME */
		opj_event_msg(p_manager, EVT_ERROR, "Number of channel description is equal to zero in CDEF box.\n");
		return OPJ_FALSE;
	}

	if (p_cdef_header_size < 2 + (OPJ_UINT32)(OPJ_UINT16)l_value * 6) {
		opj_event_msg(p_manager, EVT_ERROR, "Insufficient data for CDEF box.\n");
		return OPJ_FALSE;