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Clean up antialiasing fixes

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Simplify the code by noting that when we have square end-caps, the
results of generic line path give the right pixel-aligned rectangle
for horizontal/vertical lines.

Add comments and remove some extra braces.

https://bugzilla.gnome.org/show_bug.cgi?id=630426
This commit is contained in:
Owen W. Taylor 2010-10-06 12:47:57 -04:00
parent 6ed34976c9
commit 4b214b4710
1 changed files with 11 additions and 24 deletions
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35
src/ui/theme.c
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@ -3505,44 +3505,31 @@ meta_draw_op_draw_with_env (const MetaDrawOp *op,
y2 = y1; y2 = y1;
/* This is one of the cases where we are matching the exact /* This is one of the cases where we are matching the exact
* pixel aligned rectangle produced by X. * pixel aligned rectangle produced by X; for zero-width lines
* the generic algorithm produces the right result so we don't
* need to handle them here.
*/ */
if (y1 == y2 || x1 == x2) if ((y1 == y2 || x1 == x2) && op->data.line.width != 0)
{ {
double offset = (op->data.line.width == 0 || double offset = op->data.line.width % 2 ? .5 : 0;
op->data.line.width % 2) ? .5 : 0;
/* X includes end points for lines of width 0 */
double line_extend = op->data.line.width == 0 ? 1. : 0.;
if (y1 == y2) if (y1 == y2)
{ {
if (x2 < x1)
{
x1 ^= x2;
x2 ^= x1;
x1 ^= x2;
}
cairo_move_to (cr, x1, y1 + offset); cairo_move_to (cr, x1, y1 + offset);
cairo_line_to (cr, x2 + line_extend, y2 + offset); cairo_line_to (cr, x2, y2 + offset);
} }
else else
{ {
if (y2 < y1)
{
y1 ^= y2;
y2 ^= y1;
y1 ^= y2;
}
cairo_move_to (cr, x1 + offset, y1); cairo_move_to (cr, x1 + offset, y1);
cairo_line_to (cr, x2 + offset, y2 + line_extend); cairo_line_to (cr, x2 + offset, y2);
} }
} }
else else
{ {
if (op->data.line.width <= 0) /* zero-width lines include both end-points in X, unlike wide lines */
{ if (op->data.line.width == 0)
cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE); cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
}
cairo_move_to (cr, x1 + .5, y1 + .5); cairo_move_to (cr, x1 + .5, y1 + .5);
cairo_line_to (cr, x2 + .5, y2 + .5); cairo_line_to (cr, x2 + .5, y2 + .5);
} }