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Old 01-15-2011, 11:24 PM   #1
Registered: Aug 2008
Distribution: Gentoo; Funtoo
Posts: 211

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cairo image refresh draw

Trying to redraw different image via changeimage button event. Any ideas how to make that happen?

cairo_surface_t *image;
static gboolean pimage(GtkWidget *widget,GdkEventExpose *event,gpointer data)
cairo_t *cr;
cr = gdk_cairo_create (widget->window);
image = cairo_image_surface_create_from_png("first.png");
image = cairo_image_surface_create_from_png("second.png");

cairo_set_source_surface(cr, image, 620, 81);
return FALSE;
void changeimage(GtkWidget *widget)

g_signal_connect(window, "expose-event", G_CALLBACK (pimage), NULL);
Old 01-18-2011, 01:07 AM   #2
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Old 01-25-2011, 03:52 PM   #3
Julian Andrews
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Registered: Jan 2011
Distribution: Ubuntu
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I'm not 100% sure what the part of the process your having trouble with is, but my best guess is that you want to cause the widget to redraw when changeimage() is called.

Here's my best guess at what you're looking for:
void changeimage(GtkWidget *widget)
    count = (count + 1) % 4;
    if (count == 3)
I'm just guessing based on the 'if (count)==3' in your code that what you want is for the image to change to "first.png" every 4th click. Anyway, let me know if I'm on target!

P.S: please excuse any syntax errors, I work mostly in python, and my C is very rusty.
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Old 01-30-2011, 02:13 AM   #4
Registered: Aug 2008
Distribution: Gentoo; Funtoo
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yes! elemetary my dear watson, always overlooking the simple...


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