question on pixbufloader
Opened this issue · 3 comments
dadkins789 commented
pixbufloader only shows in stubs_GdkPixbuf.ml are there plans to fully support it?
garrigue commented
LablGTK is mostly in maintenance mode, so additions are only on request.
If you have a use case, with the functions you would need, or even better a pull request with an actual implementation, then it could be added.
dadkins789 commented
I’m just learning ocaml and translating some c++ code. Here is the use case in c++.
///////////////////////////////////////////////////////////////////////////////////
Gtk::Image * createImagefromPixbufWithText(Glib::RefPtr<Gdk::Pixbuf> pix, int count) {
auto height = pix->get_height();
auto width = pix->get_width();
//Glib::RefPtr<Gdk::Pixbuf>
auto rotpix = pix->rotate_simple (Gdk::PIXBUF_ROTATE_UPSIDEDOWN);
auto surf = Gdk::Cairo::create_surface_from_pixbuf (rotpix, 0);
auto ctx = Cairo::Context::create (surf)
Gdk::Cairo::set_source_pixbuf (ctx, rotpix);
ctx->paint();
ctx->move_to (40.0, height - 40.0);
ctx->set_source_rgb (1.0, 0.0, 1.0);
ctx->select_font_face ("courier", Cairo::FontSlant::FONT_SLANT_NORMAL, Cairo::FontWeight::FONT_WEIGHT_BOLD);
ctx->set_font_size (32.0);
auto s = fmt::format ("{:08d}", count);
ctx->show_text (s);
//surf->write_to_png ("foo.png");
return new Gtk::Image (surf);
}
boost::optional < Glib::RefPtr<Gdk::Pixbuf> > convertPayloadToPixbuf(const unsigned char *payload, int size) {
try {
Glib::RefPtr<Gdk::Pixbuf> pix;
Glib::RefPtr<Gdk::PixbufLoader> loader = Gdk::PixbufLoader::create ("jpeg");
loader->write (payload, (gsize) size);
loader->close();
pix = loader->get_pixbuf();
loader->close();
return pix;
} catch (...) {
BOOST_LOG_SEV (lg, error) << "Error converting payload to pixbuf";
return boost::none;
}
}
//////////////////////////////////////////////////////////////////////////////////
As I look at it there might be some Cairo functions missing too. I haven’t looked. Is there an existing module/class that I could use as an example to start writing the interface to pixbufloader? This is code is using gtkmm and caromm.
Thanks
Dave
… On Feb 5, 2022, at 9:54 PM, Jacques Garrigue ***@***.***> wrote:
LablGTK is mostly in maintenance mode, so additions are only on request.
If you have a use case, with the functions you would need, or even better a pull request with an actual implementation, then it could be added.
—
Reply to this email directly, view it on GitHub <#150 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABMWVQZZATELJUYU2ZB35SLUZXWGDANCNFSM5NUALDRQ>.
Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>.
You are receiving this because you authored the thread.
garrigue commented
The code for pixbufs is in gdkPixbuf.ml and ml_gdkpixbuf.c.
The macros such as ML_1 are in wrappers.h.
If you can follow what it does, give it a try.
Note that we only interface to vanilla C, not C++