Refactor CFX_ImageTransformer down sample calculations.

Change-Id: Ib3aa0b6ce2fa7b2a643068cb9ffcaca9fe18d3de
Reviewed-on: https://pdfium-review.googlesource.com/20258
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: dsinclair <dsinclair@chromium.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/core/fxge/dib/cfx_imagetransformer.h b/core/fxge/dib/cfx_imagetransformer.h
index 6df50d7801..2a54ae1841 100644
--- a/core/fxge/dib/cfx_imagetransformer.h
+++ b/core/fxge/dib/cfx_imagetransformer.h
@@ -55,6 +55,11 @@ class CFX_ImageTransformer {
     int v_w[4];
   };
 
+  struct DownSampleData {
+    int src_col;
+    int src_row;
+  };
+
   struct CalcData {
     const CFX_DIBitmap* bitmap;
     const CFX_Matrix& matrix;
@@ -90,6 +95,10 @@ class CFX_ImageTransformer {
   void DoBicubicLoop(const CalcData& cdata,
                      int increment,
                      std::function<void(const BicubicData&, uint8_t*)> func);
+  void DoDownSampleLoop(
+      const CalcData& cdata,
+      int increment,
+      std::function<void(const DownSampleData&, uint8_t*)> func);
 
   const RetainPtr<CFX_DIBSource> m_pSrc;
   UnownedPtr<const CFX_Matrix> const m_pMatrix;