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Optimize clip-to-window with clipmask case when fully visible or obscured

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This avoids creating alot of bitmaps in common trivial cases.
This commit is contained in:
Alexander Larsson 2009-07-07 15:14:16 +02:00
parent 2678a454e5
commit 52e3d2cf0e
1 changed files with 40 additions and 15 deletions
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55
gdk/gdkgc.c
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@ -646,24 +646,49 @@ _gdk_gc_add_drawable_clip (GdkGC *gc,
GdkPixmap *new_mask;
GdkGC *tmp_gc;
GdkColor black = {0, 0, 0, 0};
GdkRectangle r;
GdkOverlapType overlap;
priv->old_clip_mask = g_object_ref (priv->clip_mask);
gdk_drawable_get_size (priv->old_clip_mask, &w, &h);
gdk_drawable_get_size (priv->clip_mask, &w, &h);
new_mask = gdk_pixmap_new (priv->old_clip_mask, w, h, -1);
tmp_gc = _gdk_drawable_get_scratch_gc ((GdkDrawable *)new_mask, FALSE);
r.x = 0;
r.y = 0;
r.width = w;
r.height = h;
gdk_gc_set_foreground (tmp_gc, &black);
gdk_draw_rectangle (new_mask, tmp_gc, TRUE, 0, 0, -1, -1);
_gdk_gc_set_clip_region_internal (tmp_gc, region, TRUE); /* Takes ownership of region */
gdk_draw_drawable (new_mask,
tmp_gc,
priv->old_clip_mask,
0, 0,
0, 0,
-1, -1);
gdk_gc_set_clip_region (tmp_gc, NULL);
gdk_gc_set_clip_mask (gc, new_mask);
/* Its quite common to expose areas that are completely in or outside
* the region, so we try to avoid allocating bitmaps that are just fully
* set or completely unset.
*/
overlap = gdk_region_rect_in (region, &r);
if (overlap == GDK_OVERLAP_RECTANGLE_PART)
{
/* The region and the mask intersect, create a new clip mask that
includes both areas */
priv->old_clip_mask = g_object_ref (priv->clip_mask);
new_mask = gdk_pixmap_new (priv->old_clip_mask, w, h, -1);
tmp_gc = _gdk_drawable_get_scratch_gc ((GdkDrawable *)new_mask, FALSE);
gdk_gc_set_foreground (tmp_gc, &black);
gdk_draw_rectangle (new_mask, tmp_gc, TRUE, 0, 0, -1, -1);
_gdk_gc_set_clip_region_internal (tmp_gc, region, TRUE); /* Takes ownership of region */
gdk_draw_drawable (new_mask,
tmp_gc,
priv->old_clip_mask,
0, 0,
0, 0,
-1, -1);
gdk_gc_set_clip_region (tmp_gc, NULL);
gdk_gc_set_clip_mask (gc, new_mask);
}
else if (overlap == GDK_OVERLAP_RECTANGLE_OUT)
{
GdkRegion *empty = gdk_region_new ();
priv->old_clip_mask = g_object_ref (priv->clip_mask);
_gdk_windowing_gc_set_clip_region (gc, empty, FALSE);
gdk_region_destroy (empty);
}
}
else
{