stb_truetype: stbtt__fill_active_edges_new() dy=nan #1721
Description
I won't pretend to know what's going on in this function, but it's creating an ARM FPU fault.
I can trace through the code, and have found the following results in a div by 0.
// check if final y_crossing is blown up; no test case for this
if (y_final > y_bottom) {
y_final = y_bottom;
dy = (y_final - y_crossing ) / (x2 - (x1+1)); // if denom=0, y_final = y_crossing, so y_final <= y_bottom
}
In this case, y_final=-14 y_crossing=-14 x2=21 and x1=20.
The ARM FPU fault then occurs on:
step = sign * dy * 1; // dy is dy/dx, change in y for every 1 change in x,
If it matters, the font is: https://www.fontrepo.com/font/4274/painting-with-chocolate
Thanks!