Remove FXSYS_MulDiv(a, b, c).

core/src/fpdfapi/fpdf_render/fpdf_render_pattern.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "core/src/fpdfapi/fpdf_render/render_int.h"
 
 #include "core/include/fpdfapi/fpdf_pageobj.h"
 #include "core/include/fpdfapi/fpdf_render.h"
@@ skipping 301 matching lines @@
   }
   if (y1 < y2) {
     if (y < y1 || y > y2) {
       return FALSE;
     }
   } else {
     if (y < y2 || y > y1) {
       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,
                         int alpha,
                         CPDF_MeshVertex triangle[3]) {
   FX_FLOAT min_y = triangle[0].y, max_y = triangle[0].y;
   for (int i = 1; i < 3; i++) {
     if (min_y > triangle[i].y) {
       min_y = triangle[i].y;
     }
@@ skipping 15 matching lines @@
     int nIntersects = 0;
     FX_FLOAT inter_x[3], r[3], g[3], b[3];
     for (int i = 0; i < 3; i++) {
       CPDF_MeshVertex& vertex1 = triangle[i];
       CPDF_MeshVertex& vertex2 = triangle[(i + 1) % 3];
       FX_BOOL bIntersect = _GetScanlineIntersect(
           y, vertex1.x, vertex1.y, vertex2.x, vertex2.y, inter_x[nIntersects]);
       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) {
       continue;
     }
     int min_x, max_x, start_index, end_index;
     if (inter_x[0] < inter_x[1]) {
       min_x = (int)FXSYS_floor(inter_x[0]);
       max_x = (int)FXSYS_ceil(inter_x[1]);
       start_index = 0;
@@ skipping 829 matching lines @@
     }
   }
   if (bStroke) {
     CPDF_Color& StrokeColor = *pPathObj->m_ColorState.GetStrokeColor();
     if (StrokeColor.m_pCS && StrokeColor.m_pCS->GetFamily() == PDFCS_PATTERN) {
       DrawPathWithPattern(pPathObj, pObj2Device, &StrokeColor, TRUE);
       bStroke = FALSE;
     }
   }
 }