Refactor CFX_ImageTransformer bilinear calculations.

Change-Id: Ia38329bf5622c0ae6f5c4173332d2140de08c567
Reviewed-on: https://pdfium-review.googlesource.com/20256
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: dsinclair <dsinclair@chromium.org>

1 files changed, 15 insertions, 0 deletions

diff --git a/core/fxge/dib/cfx_imagetransformer.h b/core/fxge/dib/cfx_imagetransformer.h
index a0f9c6a816..2d22ebcf95 100644
--- a/core/fxge/dib/cfx_imagetransformer.h
+++ b/core/fxge/dib/cfx_imagetransformer.h
@@ -32,6 +32,17 @@ class CFX_ImageTransformer {
   RetainPtr<CFX_DIBitmap> DetachBitmap();
 
  private:
+  struct BilinearData {
+    int res_x;
+    int res_y;
+    int src_col_l;
+    int src_row_l;
+    int src_col_r;
+    int src_row_r;
+    int row_offset_l;
+    int row_offset_r;
+  };
+
   struct CalcData {
     const CFX_DIBitmap* bitmap;
     const CFX_Matrix& matrix;
@@ -61,6 +72,10 @@ class CFX_ImageTransformer {
 
   void AdjustCoords(int* col, int* row) const;
 
+  void DoBilinearLoop(const CalcData& cdata,
+                      int increment,
+                      std::function<void(const BilinearData&, uint8_t*)> func);
+
   const RetainPtr<CFX_DIBSource> m_pSrc;
   UnownedPtr<const CFX_Matrix> const m_pMatrix;
   const FX_RECT* const m_pClip;