gtkD load images
Antonio Corbi via Digitalmars-d-learn
digitalmars-d-learn at puremagic.com
Thu Aug 3 23:58:00 PDT 2017
On Thursday, 3 August 2017 at 21:06:36 UTC, Johnson Jones wrote:
> On Thursday, 3 August 2017 at 13:12:03 UTC, Mengu wrote:
>> On Thursday, 3 August 2017 at 03:59:40 UTC, Johnson Jones
>> wrote:
>>> How can be use gtkD to load images, I assume through
>>> gdkpixbuf? While I am getting errors loading images through
>>> glade's image:
>>>
>>> (test.exe:8188): Gtk-[1;33mWARNING[0m **: Could not load
>>> image 'a.jpg': Couldn't recognize the image file format for
>>> file 'test\a.jpg'
>>>
>>> (loads fine in glade)
>>>
>>> which needs to be resolved, I'd also like to be able to use
>>> gdkpixbuf to load images programmatically. There seems to be
>>> no demos on the gtkD github page that deals with image
>>> loading.
>>>
>>> I've tried to do something like
>>>
>>> import gtkc.gdkpixbuf;
>>> auto x = c_gdk_pixbuf_get_formats().data;
>>>
>>> but I don't know how to interpret x.
>>>
>>> Also something like
>>>
>>> import gtkc.gdkpixbuf;
>>> void* x;
>>> auto p = c_gdk_pixbuf_get_formats();
>>> for(int i = 0; i < 10; i++)
>>> {
>>> x = p.data;
>>> p = p.next;
>>> }
>>>
>>> which doesn't offer any help.
>>>
>>>
>>> Aside: How can we call the gtk functions directly using gtkD?
>>> Seems it uses stuff like
>>>
>>> Linker.link(gdk_pixbuf_get_formats, "gdk_pixbuf_get_formats",
>>> LIBRARY_GDKPIXBUF);
>>>
>>> It does seem to alias to these function but something is off
>>> and I'm not sure what.
>>
>> hi
>>
>> - is the gtk.Image class not working for you?
>> https://api.gtkd.org/gtkd/gtk/Image.html
>>
>> - there's also a gdkpixbuf.Pixbuf that you can use.
>> https://api.gtkd.org/gtkd/gdkpixbuf/Pixbuf.html
>>
>> - you can import those functions from gdkpixbuf.c.functions.
>
> So, like I said, I've tried
>
> import gdkpixbuf.Pixbuf;
> auto x = Pixbuf.newFromResource("C:\\a.jpg");
>
> which gives me that error I stated before for x86. For x64 it
> simply crashes and no exception is given.
>
> If I use a dummy image I get the same error:
>
> "Unhandled exception: glib.GException.GException The resource
> at “C:\adf.jpg” does not exist at
> generated\gtkd\glib\GException.d(40)"
>
> The error message makes look like like it should be
>
>
> "Unhandled exception: glib.GException.GException The resource
> at “C:\adf.jpg” does not exist at “C:\”
> generated\gtkd\glib\GException.d(40)"
>
>
> I'd rather use Pixbuf than image because I don't need to
> generate a full blow image widget.
>
> If I do
>
> GError* err = null;
> auto p =
> gdk_pixbuf_new_from_resource(Str.toStringz("C:\\a.jpg"), &err);
>
> p is null and err is
>
> The resource at “D:\a.jpgâ€. does not exist.
>
> which is clearly not true.
>
> So not sure what is going on ;/ Seems to be a bug in pixbuf or
> am I specifying the path wrong? If gtk.Image uses these
> internally then it is working so...
Hi!
I load images using Gtk like this (I use gtk under gnu/linux):
Pixbuf pixbuf = new Pixbuf (filename);
And draw them in a GtkDrawingArea like this:
// redrawPage is a method from my window class
// theCanvas = cast(DrawingArea)
theBuilder.getObject("wCanvas");
// theCanvas.addOnDraw (&redrawPage);
private bool redrawPage (Scoped!Context ctx, Widget wda) {
if (pixbuf !is null) {
Pixbuf img;
int w, h;
ctx.scale (drawingScale, drawingScale);
w = cast(int) (pixbuf.getWidth * drawingScale);
h = cast(int) (pixbuf.getHeight * drawingScale);
theCanvas.setSizeRequest (w, h);
ctx.setSourcePixbuf (cast(Pixbuf) thePixmap, 0.0, 0.0);
ctx.paint ();
}
return true;
}
Hope it helps you.
A. Corbi
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