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34 lines
1.1 KiB
34 lines
1.1 KiB
diff --git a/third_party/agg23/agg_clip_liang_barsky.h b/third_party/agg23/agg_clip_liang_barsky.h
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index db6ca97..5b1261f 100644
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--- a/third_party/agg23/agg_clip_liang_barsky.h
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+++ b/third_party/agg23/agg_clip_liang_barsky.h
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@@ -20,6 +20,7 @@
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#ifndef AGG_CLIP_LIANG_BARSKY_INCLUDED
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#define AGG_CLIP_LIANG_BARSKY_INCLUDED
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#include "agg_basics.h"
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+#include "third_party/base/numerics/safe_math.h"
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namespace agg
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{
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template<class T>
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@@ -36,8 +37,18 @@ inline unsigned clip_liang_barsky(T x1, T y1, T x2, T y2,
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T* x, T* y)
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{
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const float nearzero = 1e-30f;
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- float deltax = (float)(x2 - x1);
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- float deltay = (float)(y2 - y1);
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+
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+ pdfium::base::CheckedNumeric<float> width = x2;
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+ width -= x1;
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+ if (!width.IsValid())
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+ return 0;
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+ pdfium::base::CheckedNumeric<float> height = y2;
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+ height -= y1;
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+ if (!height.IsValid())
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+ return 0;
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+
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+ float deltax = width.ValueOrDefault(0);
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+ float deltay = height.ValueOrDefault(0);
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unsigned np = 0;
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if(deltax == 0) {
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deltax = (x1 > clip_box.x1) ? -nearzero : nearzero;
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