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Use a 8xN rather than a 1xN strip for a vertical gradient. This is much more tolerant of slow compositing code, and is worth some extra expense computing the gradient. (#4263, found in test case from Richard Stellingwerff)

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Owen Taylor 2005-08-30 10:42:17 +00:00
parent 2120864edf
commit a4418a63d7
2 changed files with 17 additions and 2 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
2005-08-27 Owen Taylor <otaylor@redhat.com>
* src/cairo-pattern.c (_cairo_pattern_acquire_surface_for_gradient):
Use a 8xN rather than a 1xN strip for a vertical gradient. This
is much more tolerant of slow compositing code, and is worth some
extra expense computing the gradient. (#4263, found in test case
from Richard Stellingwerff)
2005-08-27 Owen Taylor <otaylor@redhat.com>
reviewed by: cworth

11
src/cairo-pattern.c
View file

@ -1230,8 +1230,15 @@ _cairo_pattern_acquire_surface_for_gradient (cairo_gradient_pattern_t *pattern,
height = 1;
repeat = TRUE;
}
if (is_vertical) {
width = 1;
/* width-1 repeating patterns are quite slow with scan-line based
* compositing code, so we use a wider strip and spend some extra
* expense in computing the gradient. It's possible that for narrow
* gradients we'd be better off using a 2 or 4 pixel strip; the
* wider the gradient, the more it's worth spending extra time
* computing a sample.
*/
if (is_vertical && width > 8) {
width = 8;
repeat = TRUE;
}
}