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testgtk/Alpha Window: fix the drawn area when we are drawing decorations

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A GtkWindow's allocation includes the titlebar, borders, and shadows; we
only want to draw our custom alpha content over the child allocation of
the GtkWindow.

https://bugzilla.gnome.org/show_bug.cgi?id=756886
This commit is contained in:
Owen W. Taylor 2015-10-20 16:45:52 -04:00
parent 1571d2872f
commit 26d8a56506
1 changed files with 16 additions and 0 deletions
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16
tests/testgtk.c
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@ -129,6 +129,22 @@ on_alpha_window_draw (GtkWidget *widget,
cairo_pattern_t *pattern;
int radius, width, height;
/* Get the child allocation to avoid painting over the borders */
GtkWidget *child = gtk_bin_get_child (GTK_BIN (widget));
GtkAllocation child_allocation;
int border_width = gtk_container_get_border_width (GTK_CONTAINER (child));
gtk_widget_get_allocation (child, &child_allocation);
child_allocation.x -= border_width;
child_allocation.y -= border_width;
child_allocation.width += 2 * border_width;
child_allocation.height += 2 * border_width;
cairo_translate (cr, child_allocation.x, child_allocation.y);
cairo_rectangle (cr, 0, 0, child_allocation.width, child_allocation.height);
cairo_clip (cr);
width = gtk_widget_get_allocated_width (widget);
height = gtk_widget_get_allocated_height (widget);
radius = MIN (width, height) / 2;