diff --git a/core/fxge/dib/cfx_imagetransformer.cpp b/core/fxge/dib/cfx_imagetransformer.cpp
index a1bc817..d751ada 100644
--- a/core/fxge/dib/cfx_imagetransformer.cpp
+++ b/core/fxge/dib/cfx_imagetransformer.cpp
@@ -48,9 +48,9 @@
   return (r_pos_0 * (255 - res_y) + r_pos_1 * res_y) >> 8;
 }
 
-class CPDF_FixedMatrix {
+class CFX_BilinearMatrix {
  public:
-  explicit CPDF_FixedMatrix(const CFX_Matrix& src)
+  explicit CFX_BilinearMatrix(const CFX_Matrix& src)
       : a(FXSYS_roundf(src.a * kBase)),
         b(FXSYS_roundf(src.b * kBase)),
         c(FXSYS_roundf(src.c * kBase)),
@@ -58,16 +58,22 @@
         e(FXSYS_roundf(src.e * kBase)),
         f(FXSYS_roundf(src.f * kBase)) {}
 
-  void Transform(int x, int y, int* x1, int* y1) const {
-    std::pair<float, float> val = TransformInternal(x, y);
-    *x1 = pdfium::base::saturated_cast<int>(val.first / kBase);
-    *y1 = pdfium::base::saturated_cast<int>(val.second / kBase);
+  void Transform(int x, int y, int* x1, int* y1, int* res_x, int* res_y) const {
+    CFX_PointF val = TransformInternal(CFX_PointF(x, y));
+    *x1 = pdfium::base::saturated_cast<int>(val.x / kBase);
+    *y1 = pdfium::base::saturated_cast<int>(val.y / kBase);
+    *res_x = static_cast<int>(val.x) % kBase;
+    *res_y = static_cast<int>(val.y) % kBase;
+    if (*res_x < 0 && *res_x > -kBase)
+      *res_x = kBase + *res_x;
+    if (*res_y < 0 && *res_y > -kBase)
+      *res_y = kBase + *res_y;
   }
 
- protected:
-  std::pair<float, float> TransformInternal(float x, float y) const {
-    return std::make_pair(a * x + c * y + e + kBase / 2,
-                          b * x + d * y + f + kBase / 2);
+ private:
+  CFX_PointF TransformInternal(CFX_PointF pt) const {
+    return CFX_PointF(a * pt.x + c * pt.y + e + kBase / 2,
+                      b * pt.x + d * pt.y + f + kBase / 2);
   }
 
   const int a;
@@ -78,24 +84,6 @@
   const int f;
 };
 
-class CFX_BilinearMatrix final : public CPDF_FixedMatrix {
- public:
-  explicit CFX_BilinearMatrix(const CFX_Matrix& src) : CPDF_FixedMatrix(src) {}
-
-  void Transform(int x, int y, int* x1, int* y1, int* res_x, int* res_y) const {
-    std::pair<float, float> val = TransformInternal(x, y);
-    *x1 = pdfium::base::saturated_cast<int>(val.first / kBase);
-    *y1 = pdfium::base::saturated_cast<int>(val.second / kBase);
-
-    *res_x = static_cast<int>(val.first) % kBase;
-    *res_y = static_cast<int>(val.second) % kBase;
-    if (*res_x < 0 && *res_x > -kBase)
-      *res_x = kBase + *res_x;
-    if (*res_y < 0 && *res_y > -kBase)
-      *res_y = kBase + *res_y;
-  }
-};
-
 bool InStretchBounds(const FX_RECT& clip_rect, int col, int row) {
   return col >= 0 && col <= clip_rect.Width() && row >= 0 &&
          row <= clip_rect.Height();