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Be more careful with floating point divisions

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The assumption that MIN() takes care of all infinities here
turns out to be wrong. We were getting inf and -nan for some
combinations of 0 width/height and corners, leading to invalid
matrices and cairo errors.

https://bugzilla.gnome.org/show_bug.cgi?id=759668
This commit is contained in:
Matthias Clasen 2016-01-08 13:17:58 -05:00
parent 709cc08603
commit 3f56c530b3
1 changed files with 16 additions and 9 deletions
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25
gtk/gtkroundedbox.c
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@ -56,16 +56,23 @@ static void
gtk_rounded_box_clamp_border_radius (GtkRoundedBox *box)
{
gdouble factor = 1.0;
gdouble corners;
/* note: division by zero leads to +INF, which is > factor, so will be ignored */
factor = MIN (factor, box->box.width / (box->corner[GTK_CSS_TOP_LEFT].horizontal +
box->corner[GTK_CSS_TOP_RIGHT].horizontal));
factor = MIN (factor, box->box.height / (box->corner[GTK_CSS_TOP_RIGHT].vertical +
box->corner[GTK_CSS_BOTTOM_RIGHT].vertical));
factor = MIN (factor, box->box.width / (box->corner[GTK_CSS_BOTTOM_RIGHT].horizontal +
box->corner[GTK_CSS_BOTTOM_LEFT].horizontal));
factor = MIN (factor, box->box.height / (box->corner[GTK_CSS_TOP_LEFT].vertical +
box->corner[GTK_CSS_BOTTOM_LEFT].vertical));
corners = box->corner[GTK_CSS_TOP_LEFT].horizontal + box->corner[GTK_CSS_TOP_RIGHT].horizontal;
if (corners != 0)
factor = MIN (factor, box->box.width / corners);
corners = box->corner[GTK_CSS_TOP_RIGHT].vertical + box->corner[GTK_CSS_BOTTOM_RIGHT].vertical;
if (corners != 0)
factor = MIN (factor, box->box.height / corners);
corners = box->corner[GTK_CSS_BOTTOM_RIGHT].horizontal + box->corner[GTK_CSS_BOTTOM_LEFT].horizontal;
if (corners != 0)
factor = MIN (factor, box->box.width / corners);
corners = box->corner[GTK_CSS_TOP_LEFT].vertical + box->corner[GTK_CSS_BOTTOM_LEFT].vertical;
if (corners != 0)
factor = MIN (factor, box->box.height / corners);
box->corner[GTK_CSS_TOP_LEFT].horizontal *= factor;
box->corner[GTK_CSS_TOP_LEFT].vertical *= factor;