[Fontconfig-bugs] [Bug 96609] Assertion failed: (dx > 0 && dy >= 0 && x1 <= x && x <= x2), function lerp, file fcweight.c, line 48.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96609

Tony <tc01 at 1000linesofcode.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |RESOLVED
         Resolution|---                         |WORKSFORME

--- Comment #14 from Tony <tc01 at 1000linesofcode.com> ---
Thanks Akira for your help,

What you mentioned is correct, except it is values over 1000 instead of 999
that will trigger the assertion.

When I adjust the code and restored one line of code from a previous version it
fixes the issue. Patch below:

Revert a 2.12 change in fcweight.c that introduced the bug
--- src/fcweight.c.orig 2016-07-01 14:58:33.000000000 -0400
+++ src/fcweight.c      2016-07-01 14:58:56.000000000 -0400
@@ -56,7 +56,7 @@

        /* Loosely based on WPF Font Selection Model's advice. */

-       if (ot_weight < 0)
+       if (ot_weight < 0 || ot_weight >1000)
            return -1;
        else if (1 <= ot_weight && ot_weight <= 9)
        {

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