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diff --git a/third_party/agg23/agg_rasterizer_scanline_aa.h b/third_party/agg23/agg_rasterizer_scanline_aa.h
index c747ee379..da166bb14 100644
--- a/third_party/agg23/agg_rasterizer_scanline_aa.h
+++ b/third_party/agg23/agg_rasterizer_scanline_aa.h
@@ -349,14 +349,14 @@ public:
cover += cur_cell->cover;
}
if(area) {
- alpha = calculate_alpha((cover << (poly_base_shift + 1)) - area, no_smooth);
+ alpha = calculate_alpha(calculate_area(cover, poly_base_shift + 1) - area, no_smooth);
if(alpha) {
sl.add_cell(x, alpha);
}
x++;
}
if(num_cells && cur_cell->x > x) {
- alpha = calculate_alpha(cover << (poly_base_shift + 1), no_smooth);
+ alpha = calculate_alpha(calculate_area(cover, poly_base_shift + 1), no_smooth);
if(alpha) {
sl.add_span(x, cur_cell->x - x, alpha);
}
@@ -458,6 +458,11 @@ private:
m_prev_x = x;
m_prev_y = y;
}
+ static int calculate_area(int cover, int shift) {
+ unsigned int result = cover;
+ result <<= shift;
+ return result;
+ }
private:
outline_aa m_outline;
filling_rule_e m_filling_rule;
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