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app: honor the exact region when drawing and invalidate overlay children

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gimp_overlay_child_expose(): clip drawing to event->region.

gimp_overlay_child_damage(): transform and invalidate event->region's
rectangles individually to avoid redundant invalidations.
This commit is contained in:
Michael Natterer 2010-05-01 17:45:31 +02:00
parent d445361f17
commit 1833a6eaa1
1 changed files with 18 additions and 4 deletions
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22
app/widgets/gimpoverlaychild.c
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@ -334,6 +334,9 @@ gimp_overlay_child_expose (GimpOverlayBox *box,
GdkPixmap *pixmap = gdk_offscreen_window_get_pixmap (child->window);
cairo_t *cr = gdk_cairo_create (gtk_widget_get_window (widget));
gdk_cairo_region (cr, event->region);
cairo_clip (cr);
cairo_transform (cr, &child->matrix);
gdk_cairo_set_source_pixmap (cr, pixmap, 0, 0);
cairo_paint_with_alpha (cr, child->opacity);
@ -373,12 +376,23 @@ gimp_overlay_child_damage (GimpOverlayBox *box,
if (event->window == child->window)
{
GdkRectangle bounds;
GdkRectangle *rects;
gint n_rects;
gint i;
gimp_overlay_child_transform_bounds (child, &event->area, &bounds);
gdk_region_get_rectangles (event->region, &rects, &n_rects);
gdk_window_invalidate_rect (gtk_widget_get_window (widget),
&bounds, FALSE);
for (i = 0; i < n_rects; i++)
{
GdkRectangle bounds;
gimp_overlay_child_transform_bounds (child, &rects[i], &bounds);
gdk_window_invalidate_rect (gtk_widget_get_window (widget),
&bounds, FALSE);
}
g_free (rects);
return TRUE;
}