void sp_print_document_to_file(SPDocument *doc, gchar const *filename)
{
doc->ensureUpToDate();
Inkscape::Extension::Print *mod = Inkscape::Extension::get_print(SP_MODULE_KEY_PRINT_PS);
SPPrintContext context;
gchar const *oldconst = mod->get_param_string("destination");
gchar *oldoutput = g_strdup(oldconst);
mod->set_param_string("destination", (gchar *)filename);
/* Start */
context.module = mod;
/* fixme: This has to go into module constructor somehow */
/* Create new drawing */
mod->base = doc->getRoot();
Inkscape::Drawing drawing;
mod->dkey = SPItem::display_key_new(1);
mod->root = (mod->base)->invoke_show(drawing, mod->dkey, SP_ITEM_SHOW_DISPLAY);
drawing.setRoot(mod->root);
/* Print document */
mod->begin(doc);
(mod->base)->invoke_print(&context);
mod->finish();
/* Release drawing items */
(mod->base)->invoke_hide(mod->dkey);
mod->base = NULL;
mod->root = NULL; // should be deleted by invoke_hide
/* end */
mod->set_param_string("destination", oldoutput);
g_free(oldoutput);
}
ExportResult sp_export_png_file(SPDocument *doc, gchar const *filename,
Geom::Rect const &area,
unsigned long width, unsigned long height, double xdpi, double ydpi,
unsigned long bgcolor,
unsigned (*status)(float, void *),
void *data, bool force_overwrite,
GSList *items_only)
{
g_return_val_if_fail(doc != NULL, EXPORT_ERROR);
g_return_val_if_fail(filename != NULL, EXPORT_ERROR);
g_return_val_if_fail(width >= 1, EXPORT_ERROR);
g_return_val_if_fail(height >= 1, EXPORT_ERROR);
g_return_val_if_fail(!area.hasZeroArea(), EXPORT_ERROR);
if (!force_overwrite && !sp_ui_overwrite_file(filename)) {
// aborted overwrite
return EXPORT_ABORTED;
}
doc->ensureUpToDate();
/* Calculate translation by transforming to document coordinates (flipping Y)*/
Geom::Point translation = Geom::Point(-area[Geom::X][0], area[Geom::Y][1] - doc->getHeight().value("px"));
/* This calculation is only valid when assumed that (x0,y0)= area.corner(0) and (x1,y1) = area.corner(2)
* 1) a[0] * x0 + a[2] * y1 + a[4] = 0.0
* 2) a[1] * x0 + a[3] * y1 + a[5] = 0.0
* 3) a[0] * x1 + a[2] * y1 + a[4] = width
* 4) a[1] * x0 + a[3] * y0 + a[5] = height
* 5) a[1] = 0.0;
* 6) a[2] = 0.0;
*
* (1,3) a[0] * x1 - a[0] * x0 = width
* a[0] = width / (x1 - x0)
* (2,4) a[3] * y0 - a[3] * y1 = height
* a[3] = height / (y0 - y1)
* (1) a[4] = -a[0] * x0
* (2) a[5] = -a[3] * y1
*/
Geom::Affine const affine(Geom::Translate(translation)
* Geom::Scale(width / area.width(),
height / area.height()));
//SP_PRINT_MATRIX("SVG2PNG", &affine);
struct SPEBP ebp;
ebp.width = width;
ebp.height = height;
ebp.background = bgcolor;
/* Create new drawing */
Inkscape::Drawing drawing;
drawing.setExact(true); // export with maximum blur rendering quality
unsigned const dkey = SPItem::display_key_new(1);
// Create ArenaItems and set transform
drawing.setRoot(doc->getRoot()->invoke_show(drawing, dkey, SP_ITEM_SHOW_DISPLAY));
drawing.root()->setTransform(affine);
ebp.drawing = &drawing;
// We show all and then hide all items we don't want, instead of showing only requested items,
// because that would not work if the shown item references something in defs
if (items_only) {
hide_other_items_recursively(doc->getRoot(), items_only, dkey);
}
ebp.status = status;
ebp.data = data;
bool write_status = false;;
ebp.sheight = 64;
ebp.px = g_try_new(guchar, 4 * ebp.sheight * width);
if (ebp.px) {
write_status = sp_png_write_rgba_striped(doc, filename, width, height, xdpi, ydpi, sp_export_get_rows, &ebp);
g_free(ebp.px);
}
// Hide items, this releases arenaitem
doc->getRoot()->invoke_hide(dkey);
return write_status ? EXPORT_OK : EXPORT_ERROR;
}