| diff --git a/third_party/agg23/agg_vcgen_dash.cpp b/third_party/agg23/agg_vcgen_dash.cpp |
| index f690760b0..d44fca178 100644 |
| --- a/third_party/agg23/agg_vcgen_dash.cpp |
| +++ b/third_party/agg23/agg_vcgen_dash.cpp |
| @@ -18,8 +18,11 @@ |
| // |
| //---------------------------------------------------------------------------- |
| |
| +#include <cmath> |
| + |
| #include "agg_shorten_path.h" |
| #include "agg_vcgen_dash.h" |
| +#include "core/fxcrt/check_op.h" |
| |
| namespace pdfium |
| { |
| @@ -60,6 +63,8 @@ void vcgen_dash::dash_start(float ds) |
| } |
| void vcgen_dash::calc_dash_start(float ds) |
| { |
| + DCHECK_GT(m_total_dash_len, 0); |
| + ds -= floor(ds / m_total_dash_len) * m_total_dash_len; |
| m_curr_dash = 0; |
| m_curr_dash_start = 0; |
| while(ds > 0) { |
