måndagen den 12 februari 2007 01.01 skrev Magnus Myrefors: Hi again, I think I did try to change a value outside the pixbuf-data area due to negative y-values. magnus m > Hi, > > I have a function that tries to draw a point at (x,y) in a GdkPixbuf > and I am using the formula: > > guchar *p; > p = pixels + y * rowstride + x * n_channels; > > to locate the point in the pixbuf. I have used gdk_functions to get the > 'pixels' value which is start of the pixbuf-values and the rowstride, > n_channels and has_alpha. I checked the value of 'rowstride' and it was > 2800 for my pixbuf and 'n_channels' was 4. > However when I try to set the rgb-values for the pixel (x,y) I get a > segmentation fault...? The code I have used is: > > -> *p++ = 0xff; > *p++ = 0; > *p++ = 0xfc; > *p = has_alpha; > > The segmentation fault occurs at the arrow. I guess you can use > gdk_draw_point() instead but I want to make the code a bit faster > and use a function that can draw many pixels at once in a single function. > > magnus m > _______________________________________________ > gtk-list mailing list > gtk-list@xxxxxxxxx > http://mail.gnome.org/mailman/listinfo/gtk-list _______________________________________________ gtk-list mailing list gtk-list@xxxxxxxxx http://mail.gnome.org/mailman/listinfo/gtk-list
