[cairo] problem with cairo_image_surface_create_from_png() and cairo_scale()

[Stefan Salewski]

On Sun, 2012-02-19 at 13:16 +0100, cairobeginner cairobeginner wrote:

> 
> complete source code is here:
> http://www.mikrocontroller.net/attachment/134681/main.c

Please note that

>gtk_widget_queue_draw_area(window,x*SZ_PIC_X*zoomX, y*SZ_PIC_Y*zoomY,
>SZ_PIC_X*zoomX, SZ_PIC_Y*zoomY);

may not work properly when zoomX and zoomY are float or double --
gtk_widget_queue_draw_area wants parameters of type gint, see

http://developer.gnome.org/gtk3/stable/GtkWidget.html#gtk-widget-queue-draw-area