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GtkWidget: Fix clipping to large subwindows

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_gtk_widget_draw_internal() was clipping by passing the subwindow
sizes as a path to cairo_clip(). This was breaking for windows
larger than 23 bits in width/height, due to cairo using fixed point
(24.8) for the path coordinates.

We fix this by pre-clipping the subwindow region to the existing
cairo clip region in the full 32bit gdkwindow precision. This fixes
the GooCanvas Large Items test.

https://bugzilla.gnome.org/show_bug.cgi?id=710958
This commit is contained in:
Alexander Larsson 2013-10-28 11:32:51 +01:00
parent 961edcbfed
commit 864f7f7ebc
1 changed files with 19 additions and 4 deletions
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23
gtk/gtkwidget.c
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@ -6491,18 +6491,33 @@ _gtk_widget_draw_windows (GdkWindow *window,
gboolean do_clip;
GtkWidget *widget = NULL;
GList *children, *l;
GdkRectangle current_clip, window_clip;
int x, y;
if (!gdk_window_is_viewable (window))
return;
window_clip.x = window_x;
window_clip.y = window_y;
window_clip.width = gdk_window_get_width (window);
window_clip.height = gdk_window_get_height (window);
/* Cairo paths are fixed point 24.8, but gdk supports 32bit window
sizes, so we can't feed window_clip to e.g. cairo_rectangle()
directly. Instead, we pre-clip the window clip to the existing
clip regions in full 32bit precision and feed that to cairo. */
if (!gdk_cairo_get_clip_rectangle (cr, &current_clip) ||
!gdk_rectangle_intersect (&window_clip, &current_clip, &window_clip))
return;
cairo_save (cr);
cairo_translate (cr, window_x, window_y);
cairo_rectangle (cr, 0, 0,
gdk_window_get_width (window),
gdk_window_get_height (window));
cairo_rectangle (cr,
window_clip.x, window_clip.y,
window_clip.width, window_clip.height);
cairo_clip (cr);
cairo_translate (cr, window_x, window_y);
if (gdk_cairo_get_clip_rectangle (cr, NULL))
{
gdk_window_get_user_data (window, (gpointer *) &widget);