Glib::ustring SPDocument::getLanguage() {
gchar const *document_language = rdf_get_work_entity(this, rdf_find_entity("language"));
if (document_language) {
while (isspace(*document_language))
document_language++;
}
if ( !document_language || 0 == *document_language) {
// retrieve system language
document_language = getenv("LC_ALL");
if ( NULL == document_language || *document_language == 0 ) {
document_language = getenv ("LC_MESSAGES");
}
if ( NULL == document_language || *document_language == 0 ) {
document_language = getenv ("LANG");
}
if ( NULL != document_language ) {
gchar *pos = strchr(document_language, '_');
if ( NULL != pos ) {
return Glib::ustring(document_language, pos - document_language);
}
}
}
if ( NULL == document_language )
return Glib::ustring();
return document_language;
}
static bool
sp_png_write_rgba_striped(SPDocument *doc,
gchar const *filename, unsigned long int width, unsigned long int height, double xdpi, double ydpi,
int (* get_rows)(guchar const **rows, void **to_free, int row, int num_rows, void *data),
void *data)
{
struct SPEBP *ebp = (struct SPEBP *) data;
FILE *fp;
png_structp png_ptr;
png_infop info_ptr;
png_color_8 sig_bit;
png_uint_32 r;
g_return_val_if_fail(filename != NULL, false);
g_return_val_if_fail(data != NULL, false);
/* open the file */
Inkscape::IO::dump_fopen_call(filename, "M");
fp = Inkscape::IO::fopen_utf8name(filename, "wb");
g_return_val_if_fail(fp != NULL, false);
/* Create and initialize the png_struct with the desired error handler
* functions. If you want to use the default stderr and longjump method,
* you can supply NULL for the last three parameters. We also check that
* the library version is compatible with the one used at compile time,
* in case we are using dynamically linked libraries. REQUIRED.
*/
png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (png_ptr == NULL) {
fclose(fp);
return false;
}
/* Allocate/initialize the image information data. REQUIRED */
info_ptr = png_create_info_struct(png_ptr);
if (info_ptr == NULL) {
fclose(fp);
png_destroy_write_struct(&png_ptr, NULL);
return false;
}
/* Set error handling. REQUIRED if you aren't supplying your own
* error hadnling functions in the png_create_write_struct() call.
*/
if (setjmp(png_jmpbuf(png_ptr))) {
// If we get here, we had a problem reading the file
fclose(fp);
png_destroy_write_struct(&png_ptr, &info_ptr);
return false;
}
/* set up the output control if you are using standard C streams */
png_init_io(png_ptr, fp);
/* Set the image information here. Width and height are up to 2^31,
* bit_depth is one of 1, 2, 4, 8, or 16, but valid values also depend on
* the color_type selected. color_type is one of PNG_COLOR_TYPE_GRAY,
* PNG_COLOR_TYPE_GRAY_ALPHA, PNG_COLOR_TYPE_PALETTE, PNG_COLOR_TYPE_RGB,
* or PNG_COLOR_TYPE_RGB_ALPHA. interlace is either PNG_INTERLACE_NONE or
* PNG_INTERLACE_ADAM7, and the compression_type and filter_type MUST
* currently be PNG_COMPRESSION_TYPE_BASE and PNG_FILTER_TYPE_BASE. REQUIRED
*/
png_set_IHDR(png_ptr, info_ptr,
width,
height,
8, /* bit_depth */
PNG_COLOR_TYPE_RGB_ALPHA,
PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_BASE,
PNG_FILTER_TYPE_BASE);
/* otherwise, if we are dealing with a color image then */
sig_bit.red = 8;
sig_bit.green = 8;
sig_bit.blue = 8;
/* if the image has an alpha channel then */
sig_bit.alpha = 8;
png_set_sBIT(png_ptr, info_ptr, &sig_bit);
PngTextList textList;
textList.add("Software", "www.inkscape.org"); // Made by Inkscape comment
{
const gchar* pngToDc[] = {"Title", "title",
"Author", "creator",
"Description", "description",
//"Copyright", "",
"Creation Time", "date",
//"Disclaimer", "",
//"Warning", "",
"Source", "source"
//"Comment", ""
};
for (size_t i = 0; i < G_N_ELEMENTS(pngToDc); i += 2) {
struct rdf_work_entity_t * entity = rdf_find_entity ( pngToDc[i + 1] );
if (entity) {
gchar const* data = rdf_get_work_entity(doc, entity);
if (data && *data) {
textList.add(pngToDc[i], data);
}
} else {
g_warning("Unable to find entity [%s]", pngToDc[i + 1]);
}
}
struct rdf_license_t *license = rdf_get_license(doc);
if (license) {
if (license->name && license->uri) {
gchar* tmp = g_strdup_printf("%s %s", license->name, license->uri);
textList.add("Copyright", tmp);
g_free(tmp);
} else if (license->name) {
textList.add("Copyright", license->name);
} else if (license->uri) {
textList.add("Copyright", license->uri);
}
}
}
if (textList.getCount() > 0) {
png_set_text(png_ptr, info_ptr, textList.getPtext(), textList.getCount());
}
/* other optional chunks like cHRM, bKGD, tRNS, tIME, oFFs, pHYs, */
/* note that if sRGB is present the cHRM chunk must be ignored
* on read and must be written in accordance with the sRGB profile */
png_set_pHYs(png_ptr, info_ptr, unsigned(xdpi / 0.0254 + 0.5), unsigned(ydpi / 0.0254 + 0.5), PNG_RESOLUTION_METER);
/* Write the file header information. REQUIRED */
png_write_info(png_ptr, info_ptr);
/* Once we write out the header, the compression type on the text
* chunks gets changed to PNG_TEXT_COMPRESSION_NONE_WR or
* PNG_TEXT_COMPRESSION_zTXt_WR, so it doesn't get written out again
* at the end.
*/
/* set up the transformations you want. Note that these are
* all optional. Only call them if you want them.
*/
/* --- CUT --- */
/* The easiest way to write the image (you may have a different memory
* layout, however, so choose what fits your needs best). You need to
* use the first method if you aren't handling interlacing yourself.
*/
png_bytep* row_pointers = new png_bytep[ebp->sheight];
r = 0;
while (r < static_cast<png_uint_32>(height)) {
void *to_free;
int n = get_rows((unsigned char const **) row_pointers, &to_free, r, height-r, data);
if (!n) break;
png_write_rows(png_ptr, row_pointers, n);
g_free(to_free);
r += n;
}
delete[] row_pointers;
/* You can write optional chunks like tEXt, zTXt, and tIME at the end
* as well.
*/
/* It is REQUIRED to call this to finish writing the rest of the file */
png_write_end(png_ptr, info_ptr);
/* if you allocated any text comments, free them here */
/* clean up after the write, and free any memory allocated */
png_destroy_write_struct(&png_ptr, &info_ptr);
/* close the file */
fclose(fp);
/* that's it */
return true;
}