static pdf_obj *
create_cspace_ICCBased (png_structp png_ptr, png_infop info_ptr)
{
pdf_obj *colorspace;
int csp_id, colortype;
png_byte color_type;
png_charp name;
int compression_type; /* Manual page for libpng does not
* clarify whether profile data is inflated by libpng.
*/
#if PNG_LIBPNG_VER_MINOR < 5
png_charp profile;
#else
png_bytep profile;
#endif
png_uint_32 proflen;
if (!png_get_valid(png_ptr, info_ptr, PNG_INFO_iCCP) ||
!png_get_iCCP(png_ptr, info_ptr, &name, &compression_type, &profile, &proflen))
return NULL;
color_type = png_get_color_type(png_ptr, info_ptr);
if (color_type & PNG_COLOR_MASK_COLOR) {
colortype = PDF_COLORSPACE_TYPE_RGB;
#if 0
alternate = create_cspace_CalRGB(png_ptr, info_ptr);
#endif
} else {
colortype = PDF_COLORSPACE_TYPE_GRAY;
#if 0
alternate = create_cspace_CalGray(png_ptr, info_ptr);
#endif
}
#if 0
if (alternate)
pdf_add_dict(dict, pdf_new_name("Alternate"), alternate);
#endif
if (iccp_check_colorspace(colortype, profile, proflen) < 0)
colorspace = NULL;
else {
csp_id = iccp_load_profile(name, profile, proflen);
if (csp_id < 0) {
colorspace = NULL;
} else {
colorspace = pdf_get_colorspace_reference(csp_id);
}
}
/* Rendering intent ... */
return colorspace;
}
int
jpeg_include_image (pdf_ximage *ximage, FILE *fp)
{
pdf_obj *stream;
pdf_obj *stream_dict;
pdf_obj *colorspace;
int colortype;
ximage_info info;
struct JPEG_info j_info;
if (!texpdf_check_for_jpeg(fp)) {
WARN("%s: Not a JPEG file?", JPEG_DEBUG_STR);
rewind(fp);
return -1;
}
/* File position is 2 here... */
texpdf_ximage_init_image_info(&info);
JPEG_info_init(&j_info);
if (JPEG_scan_file(&j_info, fp) < 0) {
WARN("%s: Not a JPEG file?", JPEG_DEBUG_STR);
JPEG_info_clear(&j_info);
return -1;
}
switch (j_info.num_components) {
case 1:
colortype = PDF_COLORSPACE_TYPE_GRAY;
break;
case 3:
colortype = PDF_COLORSPACE_TYPE_RGB;
break;
case 4:
colortype = PDF_COLORSPACE_TYPE_CMYK;
break;
default:
WARN("%s: Unknown color space (num components: %d)", JPEG_DEBUG_STR, info.num_components);
JPEG_info_clear(&j_info);
return -1;
}
/* JPEG image use DCTDecode. */
stream = texpdf_new_stream (0);
stream_dict = texpdf_stream_dict(stream);
texpdf_add_dict(stream_dict,
texpdf_new_name("Filter"), texpdf_new_name("DCTDecode"));
/* XMP Metadata */
if (texpdf_get_version() >= 4) {
if (j_info.flags & HAVE_APPn_XMP) {
pdf_obj *XMP_stream;
XMP_stream = JPEG_get_XMP(&j_info);
texpdf_add_dict(stream_dict,
texpdf_new_name("Metadata"), texpdf_ref_obj(XMP_stream));
texpdf_release_obj(XMP_stream);
}
}
/* Check embedded ICC Profile */
colorspace = NULL;
if (j_info.flags & HAVE_APPn_ICC) {
pdf_obj *icc_stream, *intent;
int cspc_id;
icc_stream = JPEG_get_iccp(&j_info);
if (!icc_stream)
colorspace = NULL;
else {
if (iccp_check_colorspace(colortype,
pdf_stream_dataptr(icc_stream), pdf_stream_length (icc_stream)) < 0)
colorspace = NULL;
else {
cspc_id = iccp_load_profile(NULL, /* noname */
pdf_stream_dataptr(icc_stream),
pdf_stream_length (icc_stream));
if (cspc_id < 0)
colorspace = NULL;
else {
colorspace = texpdf_get_colorspace_reference(cspc_id);
intent = iccp_get_rendering_intent(pdf_stream_dataptr(icc_stream),
pdf_stream_length (icc_stream));
if (intent)
texpdf_add_dict(stream_dict, texpdf_new_name("Intent"), intent);
}
}
texpdf_release_obj(icc_stream);
}
}
/* No ICC or invalid ICC profile. */
if (!colorspace) {
switch (colortype) {
case PDF_COLORSPACE_TYPE_GRAY:
colorspace = texpdf_new_name("DeviceGray");
break;
case PDF_COLORSPACE_TYPE_RGB:
colorspace = texpdf_new_name("DeviceRGB");
break;
case PDF_COLORSPACE_TYPE_CMYK:
colorspace = texpdf_new_name("DeviceCMYK");
break;
}
}
texpdf_add_dict(stream_dict, texpdf_new_name("ColorSpace"), colorspace);
#define IS_ADOBE_CMYK(j) (((j).flags & HAVE_APPn_ADOBE) && (j).num_components == 4)
if (IS_ADOBE_CMYK(j_info)) {
pdf_obj *decode;
int i;
WARN("Adobe CMYK JPEG: Inverted color assumed.");
decode = texpdf_new_array();
for (i = 0; i < j_info.num_components; i++) {
texpdf_add_array(decode, texpdf_new_number(1.0));
texpdf_add_array(decode, texpdf_new_number(0.0));
}
texpdf_add_dict(stream_dict, texpdf_new_name("Decode"), decode);
}
/* Copy file */
JPEG_copy_stream(&j_info, stream, fp);
info.width = j_info.width;
info.height = j_info.height;
info.bits_per_component = j_info.bits_per_component;
info.num_components = j_info.num_components;
jpeg_get_density(&j_info, &info.xdensity, &info.ydensity);
texpdf_ximage_set_image(ximage, &info, stream);
JPEG_info_clear(&j_info);
return 0;
}