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Fix more overflows

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This commit is contained in:
Erica Fischer
2024-03-18 10:17:18 -07:00
parent 1c97d476c5
commit cc6135dd02
4 changed files with 22 additions and 15 deletions
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clip.cpp
+6 -4
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@@ -184,19 +184,21 @@ int clip(long long *x0, long long *y0, long long *x1, long long *y1, long long x
// XXX truncating division
long long shift = 1LL << (GLOBAL_DETAIL - 32);
// Now find the intersection point;
// use formulas y = y0 + slope * (x - x0), x = x0 + (1 / slope) * (y - y0)
if (outcodeOut & TOP) { // point is above the clip rectangle
x = *x0 + (*x1 - *x0) * (ymax - *y0) / (*y1 - *y0);
x = *x0 + ((*x1 - *x0) / shift) * ((ymax - *y0) / shift) / (*y1 - *y0) * shift * shift;
y = ymax;
} else if (outcodeOut & BOTTOM) { // point is below the clip rectangle
x = *x0 + (*x1 - *x0) * (ymin - *y0) / (*y1 - *y0);
x = *x0 + ((*x1 - *x0) / shift) * ((ymin - *y0) / shift) / (*y1 - *y0) * shift * shift;
y = ymin;
} else if (outcodeOut & RIGHT) { // point is to the right of clip rectangle
y = *y0 + (*y1 - *y0) * (xmax - *x0) / (*x1 - *x0);
y = *y0 + ((*y1 - *y0) / shift) * ((xmax - *x0) / shift) / (*x1 - *x0) * shift * shift;
x = xmax;
} else if (outcodeOut & LEFT) { // point is to the left of clip rectangle
y = *y0 + (*y1 - *y0) * (xmin - *x0) / (*x1 - *x0);
y = *y0 + ((*y1 - *y0) / shift) * ((xmin - *x0) / shift) / (*x1 - *x0) * shift * shift;
x = xmin;
}