diff --git a/core/include/fxcrt/fx_system.h b/core/include/fxcrt/fx_system.h
index 920c821..8471610 100644
--- a/core/include/fxcrt/fx_system.h
+++ b/core/include/fxcrt/fx_system.h
@@ -269,7 +269,6 @@
 int64_t FXSYS_wtoi64(const FX_WCHAR* str);
 const FX_CHAR* FXSYS_i64toa(int64_t value, FX_CHAR* str, int radix);
 int FXSYS_round(FX_FLOAT f);
-#define FXSYS_MulDiv(a, b, c) ((a) * (b) / (c))
 #define FXSYS_sqrt2(a, b) (FX_FLOAT) FXSYS_sqrt((a) * (a) + (b) * (b))
 #ifdef __cplusplus
 };
diff --git a/core/src/fpdfapi/fpdf_render/fpdf_render_pattern.cpp b/core/src/fpdfapi/fpdf_render/fpdf_render_pattern.cpp
index 43ce995..4ad6f81 100644
--- a/core/src/fpdfapi/fpdf_render/fpdf_render_pattern.cpp
+++ b/core/src/fpdfapi/fpdf_render/fpdf_render_pattern.cpp
@@ -319,7 +319,7 @@
       return FALSE;
     }
   }
-  x = x1 + FXSYS_MulDiv(x2 - x1, y - y1, y2 - y1);
+  x = x1 + ((x2 - x1) * (y - y1) / (y2 - y1));
   return TRUE;
 }
 static void DrawGouraud(CFX_DIBitmap* pBitmap,
@@ -355,15 +355,11 @@
       if (!bIntersect) {
         continue;
       }
-      r[nIntersects] =
-          vertex1.r + FXSYS_MulDiv(vertex2.r - vertex1.r, y - vertex1.y,
-                                   vertex2.y - vertex1.y);
-      g[nIntersects] =
-          vertex1.g + FXSYS_MulDiv(vertex2.g - vertex1.g, y - vertex1.y,
-                                   vertex2.y - vertex1.y);
-      b[nIntersects] =
-          vertex1.b + FXSYS_MulDiv(vertex2.b - vertex1.b, y - vertex1.y,
-                                   vertex2.y - vertex1.y);
+
+      FX_FLOAT y_dist = (y - vertex1.y) / (vertex2.y - vertex1.y);
+      r[nIntersects] = vertex1.r + ((vertex2.r - vertex1.r) * y_dist);
+      g[nIntersects] = vertex1.g + ((vertex2.g - vertex1.g) * y_dist);
+      b[nIntersects] = vertex1.b + ((vertex2.b - vertex1.b) * y_dist);
       nIntersects++;
     }
     if (nIntersects != 2) {
diff --git a/core/src/fxge/ge/fx_ge_path.cpp b/core/src/fxge/ge/fx_ge_path.cpp
index 0c24c0f..0b52cdf 100644
--- a/core/src/fxge/ge/fx_ge_path.cpp
+++ b/core/src/fxge/ge/fx_ge_path.cpp
@@ -266,15 +266,14 @@
     start_k = (middle_y - start_y) / (middle_x - start_x);
     start_c = middle_y - (start_k * middle_x);
     start_len = FXSYS_sqrt2(start_x - middle_x, start_y - middle_y);
-    start_dc = (FX_FLOAT)FXSYS_fabs(
-        FXSYS_MulDiv(half_width, start_len, start_x - middle_x));
+    start_dc =
+        (FX_FLOAT)FXSYS_fabs(half_width * start_len / (start_x - middle_x));
   }
   if (!bEndVert) {
     end_k = (end_y - middle_y) / (end_x - middle_x);
     end_c = middle_y - (end_k * middle_x);
     end_len = FXSYS_sqrt2(end_x - middle_x, end_y - middle_y);
-    end_dc = (FX_FLOAT)FXSYS_fabs(
-        FXSYS_MulDiv(half_width, end_len, end_x - middle_x));
+    end_dc = (FX_FLOAT)FXSYS_fabs(half_width * end_len / (end_x - middle_x));
   }
   if (bStartVert) {
     FX_FLOAT outside_x = start_x;
diff --git a/third_party/agg23/agg_math.h b/third_party/agg23/agg_math.h
index c0d9570..e003297 100644
--- a/third_party/agg23/agg_math.h
+++ b/third_party/agg23/agg_math.h
@@ -44,7 +44,7 @@
     if(d < intersection_epsilon) {
         return calc_distance(x1, y1, x, y);
     }
-    return FXSYS_MulDiv(x - x2, dy, d) - FXSYS_MulDiv(y - y2, dx, d);
+    return ((x - x2) * dy / d) - ((y - y2) * dx / d);
 }
 AGG_INLINE bool calc_intersection(FX_FLOAT ax, FX_FLOAT ay, FX_FLOAT bx, FX_FLOAT by,
                                   FX_FLOAT cx, FX_FLOAT cy, FX_FLOAT dx, FX_FLOAT dy,
@@ -55,8 +55,8 @@
     if (FXSYS_fabs(den) < intersection_epsilon) {
         return false;
     }
-    *x = ax + FXSYS_MulDiv(bx - ax, num, den);
-    *y = ay + FXSYS_MulDiv(by - ay, num, den);
+    *x = ax + ((bx - ax) * num / den);
+    *y = ay + ((by - ay) * num / den);
     return true;
 }
 }
diff --git a/third_party/agg23/agg_math_stroke.h b/third_party/agg23/agg_math_stroke.h
index 402028b..6d7ba8a 100644
--- a/third_party/agg23/agg_math_stroke.h
+++ b/third_party/agg23/agg_math_stroke.h
@@ -198,10 +198,10 @@
 {
     typedef typename VertexConsumer::value_type coord_type;
     FX_FLOAT dx1, dy1, dx2, dy2;
-    dx1 = FXSYS_MulDiv(width, v1.y - v0.y, len1);
-    dy1 = FXSYS_MulDiv(width, v1.x - v0.x, len1);
-    dx2 = FXSYS_MulDiv(width, v2.y - v1.y, len2);
-    dy2 = FXSYS_MulDiv(width, v2.x - v1.x, len2);
+    dx1 = width * (v1.y - v0.y) / len1;
+    dy1 = width * (v1.x - v0.x) / len1;
+    dx2 = width * (v2.y - v1.y) / len2;
+    dy2 = width * (v2.x - v1.x) / len2;
     out_vertices.remove_all();
     if(calc_point_location(v0.x, v0.y, v1.x, v1.y, v2.x, v2.y) > 0) {
         switch(inner_join) {
diff --git a/third_party/agg23/agg_vcgen_stroke.cpp b/third_party/agg23/agg_vcgen_stroke.cpp
index ef8bc27..afc4ee6 100644
--- a/third_party/agg23/agg_vcgen_stroke.cpp
+++ b/third_party/agg23/agg_vcgen_stroke.cpp
@@ -68,14 +68,13 @@
                                  const vertex_dist& v0,
                                  const vertex_dist& v1,
                                  FX_FLOAT len,
-                                 FX_FLOAT width)
-{
-    FX_FLOAT dx = FXSYS_MulDiv(v1.y - v0.y, width, len);
-    FX_FLOAT dy = FXSYS_MulDiv(v1.x - v0.x, width, len);
-    cap[0] = v0.x - dx;
-    cap[1] = v0.y + dy;
-    cap[2] = v0.x + dx;
-    cap[3] = v0.y - dy;
+                                 FX_FLOAT width) {
+  FX_FLOAT dx = (v1.y - v0.y) * width / len;
+  FX_FLOAT dy = (v1.x - v0.x) * width / len;
+  cap[0] = v0.x - dx;
+  cap[1] = v0.y + dy;
+  cap[2] = v0.x + dx;
+  cap[3] = v0.y - dy;
 }
 void vcgen_stroke::rewind(unsigned)
 {