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sna: Micro-optimise line extents for zero line width 

Handling zero line widths is the common case, so avoid the extra work.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2012-01-18 00:56:07 +00:00
parent 3c01074507
commit ff2eb116ef
1 changed files with 14 additions and 13 deletions
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27
src/sna/sna_accel.c
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@ -5192,19 +5192,11 @@ sna_poly_line_extents(DrawablePtr drawable, GCPtr gc,
BoxPtr out)
{
BoxRec box;
int extra = gc->lineWidth >> 1;
bool clip, blt = true;
if (n == 0)
return 0;
if (n > 1) {
if (gc->joinStyle == JoinMiter)
extra = 6 * gc->lineWidth;
else if (gc->capStyle == CapProjecting)
extra = gc->lineWidth;
}
box.x2 = box.x1 = pt->x;
box.y2 = box.y1 = pt->y;
if (mode == CoordModePrevious) {
@ -5234,11 +5226,20 @@ sna_poly_line_extents(DrawablePtr drawable, GCPtr gc,
box.x2++;
box.y2++;
if (extra) {
box.x1 -= extra;
box.x2 += extra;
box.y1 -= extra;
box.y2 += extra;
if (gc->lineWidth) {
int extra = gc->lineWidth >> 1;
if (n > 1) {
if (gc->joinStyle == JoinMiter)
extra = 6 * gc->lineWidth;
else if (gc->capStyle == CapProjecting)
extra = gc->lineWidth;
}
if (extra) {
box.x1 -= extra;
box.x2 += extra;
box.y1 -= extra;
box.y2 += extra;
}
}
clip = trim_and_translate_box(&box, drawable, gc);