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cssmatcher: Speed up common matching

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first-child and last-child are the most common usages of the nth-child
machinery, so special-casing them makes sense.
This commit is contained in:
Benjamin Otte 2015-05-28 17:40:55 +02:00
parent 59a7739fce
commit 03312371da
1 changed files with 12 additions and 3 deletions
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15
gtk/gtkcssmatcher.c
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@ -358,6 +358,18 @@ gtk_css_matcher_node_nth_child (GtkCssNode *node,
{
int pos, x;
/* special-case the common "first-child" and "last-child" */
if (a == 0)
{
while (b > 0 && node != NULL)
{
b--;
node = prev_node_func (node);
}
return b == 0 && node == NULL;
}
/* count nodes */
for (pos = 0; node != NULL; pos++)
node = prev_node_func (node);
@ -366,9 +378,6 @@ gtk_css_matcher_node_nth_child (GtkCssNode *node,
* and return TRUE if X is integer >= 0 */
x = pos - b;
if (a == 0)
return x == 0;
if (x % a)
return FALSE;