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Bug 792903. Prevent num_stops from being set to zero. r=bas

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This commit is contained in:
Robert O'Callahan 2012-09-26 12:19:32 +12:00
parent 467680df9f
commit 8d196dd5fa
1 changed files with 4 additions and 1 deletions
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5
gfx/cairo/cairo/src/cairo-d2d-surface.cpp
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@ -1646,7 +1646,10 @@ _cairo_d2d_create_linear_gradient_brush(cairo_d2d_surface_t *d2dsurf,
min_dist = MAX(-min_dist, 0);
// Repeats after gradient start.
int after_repeat = (int)ceil(max_dist / gradient_length);
// It's possible for max_dist and min_dist to both be zero, in which case
// we'll set num_stops to 0 and crash D2D. Let's just ensure after_repeat
// is at least 1.
int after_repeat = MAX((int)ceil(max_dist / gradient_length), 1);
int before_repeat = (int)ceil(min_dist / gradient_length);
num_stops *= (after_repeat + before_repeat);