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css: Avoid excessive shadow rendering

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The shadow rendering code had code to exit early if we determine
that the shadow is entirely clipped away. Unfortunately, the check
based on cairo clip extents fails for any clip regions that are
more complicated than axis-aligned rectangles, and we are using
a hollow rounded rectangle here. So, instead, do the check manually,
using the just-introduced API in GtkRoundedBox.
This commit is contained in:
Matthias Clasen 2014-12-02 08:29:24 -05:00
parent 73e6a05e38
commit cb3393f001
1 changed files with 6 additions and 7 deletions
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13
gtk/gtkcssshadowvalue.c
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@ -638,9 +638,15 @@ _gtk_css_shadow_value_paint_box (const GtkCssValue *shadow,
{
GtkRoundedBox box, clip_box;
double spread, radius, clip_radius, x, y, outside;
double x1, y1, x2, y2;
g_return_if_fail (shadow->class == &GTK_CSS_VALUE_SHADOW);
cairo_clip_extents (cr, &x1, &y1, &x2, &y2);
if ((shadow->inset && !_gtk_rounded_box_intersects_rectangle (padding_box, x1, y1, x2, y2)) ||
(!shadow->inset && _gtk_rounded_box_contains_rectangle (padding_box, x1, y1, x2, y2)))
return;
cairo_save (cr);
spread = _gtk_css_number_value_get (shadow->spread, 0);
@ -658,7 +664,6 @@ _gtk_css_shadow_value_paint_box (const GtkCssValue *shadow,
{
cairo_set_fill_rule (cr, CAIRO_FILL_RULE_EVEN_ODD);
_gtk_rounded_box_path (padding_box, cr);
outside = spread + clip_radius + MAX (fabs (x), fabs (y));
clip_box = *padding_box;
_gtk_rounded_box_grow (&clip_box, outside, outside, outside, outside);
@ -667,12 +672,6 @@ _gtk_css_shadow_value_paint_box (const GtkCssValue *shadow,
cairo_clip (cr);
}
if (has_empty_clip (cr))
{
cairo_restore (cr);
return;
}
box = *padding_box;
_gtk_rounded_box_move (&box, x, y);