gdk_cairo_set_source_window
gdk_cairo_rectangle
gdk_cairo_region
-gdk_cairo_reset_clip
gdk_cairo_region_create_from_surface
</SECTION>
<para>
Problems can also occur when using cairo for drawing. One thing that can
- go wrong is clip handling. If you ever need to reset the clip region on
- a cairo_t (i.e. use cairo_reset_clip()), you have to to use
- gdk_cairo_reset_clip() instead. The reason for this is that the cairo_reset_clip() call will remove the initial clip region that limits your drawing to
- the client-side window at hand, so you will end up drawing over stuff
- outside the window. You also need to use gdk_cairo_reset_clip() if you
- use a cairo_t that was not allocated in a double-buffered expose handler
- and keep it in use after window hierarchy changes (resizing, moving,
- stacking order changes). The easiest fix for this kind of problem is to
- simply create a new cairo context for each expose event.
+ go wrong is clip handling. You may not use cairo_reset_clip() on a
+ cairo_t on a cairo context created via gdk_cairo_create() or passed to
+ the GtkWidget::draw signal.
</para>
<para>
return cr;
}
-/**
- * gdk_cairo_reset_clip:
- * @cr: a #cairo_t
- * @drawable: a #GdkDrawable
- *
- * Resets the clip region for a Cairo context created by gdk_cairo_create().
- *
- * This resets the clip region to the "empty" state for the given drawable.
- * This is required for non-native windows since a direct call to
- * cairo_reset_clip() would unset the clip region inherited from the
- * drawable (i.e. the window clip region), and thus let you e.g.
- * draw outside your window.
- *
- * This is rarely needed though, since most code just create a new cairo_t
- * using gdk_cairo_create() each time they want to draw something.
- *
- * Since: 2.18
- **/
-void
-gdk_cairo_reset_clip (cairo_t *cr,
- GdkDrawable *drawable)
-{
- cairo_reset_clip (cr);
-
- if (GDK_DRAWABLE_GET_CLASS (drawable)->set_cairo_clip)
- GDK_DRAWABLE_GET_CLASS (drawable)->set_cairo_clip (drawable, cr);
-}
-
/**
* gdk_cairo_get_clip_rectangle:
* @cr: a cairo context
G_BEGIN_DECLS
cairo_t *gdk_cairo_create (GdkDrawable *drawable);
-void gdk_cairo_reset_clip (cairo_t *cr,
- GdkDrawable *drawable);
gboolean gdk_cairo_get_clip_rectangle(cairo_t *cr,
GdkRectangle *rect);