When b is 0, avoid the division by zero and just return transparent
black.
When the solution t would have an invalid radius (negative or outside
[0,1] for none-extended gradients), return transparent black.
---
pixman/pixman-radial-gradient.c | 20 ++++++++++++++++++--
1 files changed, 18 insertions(+), 2 deletions(-)
diff --git a/pixman/pixman-radial-gradient.c b/pixman/pixman-radial-gradient.c
index b595ba7..7b92307 100644
--- a/pixman/pixman-radial-gradient.c
+++ b/pixman/pixman-radial-gradient.c
@@ -96,8 +96,24 @@ radial_compute_color (double a,
if (a == 0)
{
- return _pixman_gradient_walker_pixel (walker,
- pixman_fixed_1 / 2 * c / b);
+ double t;
+
+ if (b == 0)
+ return 0;
+
+ t = pixman_fixed_1 / 2 * c / b;
+ if (repeat == PIXMAN_REPEAT_NONE)
+ {
+ if (0 <= t && t <= pixman_fixed_1)
+ return _pixman_gradient_walker_pixel (walker, t);
+ }
+ else
+ {
+ if (t * dr > mindr)
+ return _pixman_gradient_walker_pixel (walker, t);
+ }
+
+ return 0;
}
det = fdot (b, a, 0, b, -c, 0);
--
1.7.1
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