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fix one clear case of unsigned overflow in comp_op_rgba_minus - refs #1679

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This commit is contained in:
Dane Springmeyer 2013-10-01 22:03:15 -07:00
parent a25826fb13
commit 9d8be8ea21
1 changed files with 3 additions and 3 deletions
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6
deps/agg/include/agg_pixfmt_rgba.h vendored
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@ -686,9 +686,9 @@ namespace agg
}
if(sa)
{
calc_type dr = p[Order::R] - sr;
calc_type dg = p[Order::G] - sg;
calc_type db = p[Order::B] - sb;
calc_type dr = (sr > p[Order::R]) ? 0 : p[Order::R] - sr;
calc_type dg = (sg > p[Order::G]) ? 0 : p[Order::G] - sg;
calc_type db = (sb > p[Order::B]) ? 0 : p[Order::B] - sb;
p[Order::R] = (dr > base_mask) ? 0 : dr;
p[Order::G] = (dg > base_mask) ? 0 : dg;
p[Order::B] = (db > base_mask) ? 0 : db;