1 files changed, 81 insertions, 0 deletions
diff --git a/core/fxge/dib/cstretchengine.h b/core/fxge/dib/cstretchengine.h
new file mode 100644
index 0000000000..0d9457fb9d
--- /dev/null
+++ b/core/fxge/dib/cstretchengine.h
@@ -0,0 +1,81 @@
+// Copyright 2017 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
+
+#ifndef CORE_FXGE_DIB_CSTRETCHENGINE_H_
+#define CORE_FXGE_DIB_CSTRETCHENGINE_H_
+
+#include "core/fxcrt/fx_coordinates.h"
+#include "core/fxge/fx_dib.h"
+
+class IFX_ScanlineComposer;
+
+class CStretchEngine {
+ public:
+  CStretchEngine(IFX_ScanlineComposer* pDestBitmap,
+                 FXDIB_Format dest_format,
+                 int dest_width,
+                 int dest_height,
+                 const FX_RECT& clip_rect,
+                 const CFX_RetainPtr<CFX_DIBSource>& pSrcBitmap,
+                 int flags);
+  ~CStretchEngine();
+
+  bool Continue(IFX_Pause* pPause);
+
+  bool StartStretchHorz();
+  bool ContinueStretchHorz(IFX_Pause* pPause);
+  void StretchVert();
+
+  class CWeightTable {
+   public:
+    CWeightTable();
+    ~CWeightTable();
+
+    bool Calc(int dest_len,
+              int dest_min,
+              int dest_max,
+              int src_len,
+              int src_min,
+              int src_max,
+              int flags);
+    PixelWeight* GetPixelWeight(int pixel) const;
+    int* GetValueFromPixelWeight(PixelWeight* pWeight, int index) const;
+    size_t GetPixelWeightSize() const;
+
+   private:
+    int m_DestMin;
+    int m_ItemSize;
+    uint8_t* m_pWeightTables;
+    size_t m_dwWeightTablesSize;
+  };
+
+  FXDIB_Format m_DestFormat;
+  int m_DestBpp;
+  int m_SrcBpp;
+  int m_bHasAlpha;
+  IFX_ScanlineComposer* m_pDestBitmap;
+  int m_DestWidth, m_DestHeight;
+  FX_RECT m_DestClip;
+  uint8_t* m_pDestScanline;
+  uint8_t* m_pDestMaskScanline;
+  FX_RECT m_SrcClip;
+  CFX_RetainPtr<CFX_DIBSource> m_pSource;
+  uint32_t* m_pSrcPalette;
+  int m_SrcWidth;
+  int m_SrcHeight;
+  int m_SrcPitch;
+  int m_InterPitch;
+  int m_ExtraMaskPitch;
+  uint8_t* m_pInterBuf;
+  uint8_t* m_pExtraAlphaBuf;
+  int m_TransMethod;
+  int m_Flags;
+  CWeightTable m_WeightTable;
+  int m_CurRow;
+  int m_State;
+};
+
+#endif  // CORE_FXGE_DIB_CSTRETCHENGINE_H_