Re: goocanvas vs crcanvas,which better?
- From: Dov Grobgeld <dov grobgeld gmail com>
- To: b3nder yandex ru
- Cc: gtk-app-devel-list gnome org
- Subject: Re: goocanvas vs crcanvas,which better?
- Date: Fri, 27 Mar 2009 08:32:19 +0300
The following does it:
int img_width = gdk_pixbuf_get_width(pixbuf);
int img_height = gdk_pixbuf_get_height(pixbuf);
cairo_surface_t *surface
= cairo_image_surface_create_for_data(gdk_pixbuf_get_pixels(pixbuf),
CAIRO_FORMAT_ARGB32,
img_width,
img_height,
gdk_pixbuf_get_rowstride(pixbuf));
You will have to swap R and B in calls to:
cairo_set_source_rgba (cr, 0,0,1.0,0.5);
when drawing though, as cairo and gdk_pixbuf have different ideas about
their order.
(These examples are copied from the GtkImageViewer tutorial.)
Regards,
Dov
2009/3/26 Alexander <b3nder yandex ru>
Hi, Dov.
On Thursday 26 March 2009, Dov Grobgeld wrote:
- If the annotation is static, it certainly faster to prepare a
transparent pixbuf and draw the annotation on the pixbuf and then
simply
merge the data from the frame grabber with the overlay mostly
transparent
pixbuf, and then ship the result of to display.
Is there standard facility for creating cairo context for pixbuf? Like
gdk_cairo_create() for drawables.
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