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diff --git a/core/fxge/dib/cfx_bitmapcomposer.h b/core/fxge/dib/cfx_bitmapcomposer.h
new file mode 100644
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+++ b/core/fxge/dib/cfx_bitmapcomposer.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_CFX_BITMAPCOMPOSER_H_
+#define CORE_FXGE_DIB_CFX_BITMAPCOMPOSER_H_
+
+#include "core/fxcrt/cfx_retain_ptr.h"
+#include "core/fxcrt/fx_coordinates.h"
+#include "core/fxge/dib/cfx_scanlinecompositor.h"
+#include "core/fxge/fx_dib.h"
+
+class CFX_ClipRgn;
+class CFX_DIBitmap;
+
+class CFX_BitmapComposer : public IFX_ScanlineComposer {
+ public:
+  CFX_BitmapComposer();
+  ~CFX_BitmapComposer() override;
+
+  void Compose(const CFX_RetainPtr<CFX_DIBitmap>& pDest,
+               const CFX_ClipRgn* pClipRgn,
+               int bitmap_alpha,
+               uint32_t mask_color,
+               FX_RECT& dest_rect,
+               bool bVertical,
+               bool bFlipX,
+               bool bFlipY,
+               bool bRgbByteOrder = false,
+               int alpha_flag = 0,
+               void* pIccTransform = nullptr,
+               int blend_type = FXDIB_BLEND_NORMAL);
+
+  // IFX_ScanlineComposer
+  bool SetInfo(int width,
+               int height,
+               FXDIB_Format src_format,
+               uint32_t* pSrcPalette) override;
+
+  void ComposeScanline(int line,
+                       const uint8_t* scanline,
+                       const uint8_t* scan_extra_alpha) override;
+
+ private:
+  void DoCompose(uint8_t* dest_scan,
+                 const uint8_t* src_scan,
+                 int dest_width,
+                 const uint8_t* clip_scan,
+                 const uint8_t* src_extra_alpha = nullptr,
+                 uint8_t* dst_extra_alpha = nullptr);
+  void ComposeScanlineV(int line,
+                        const uint8_t* scanline,
+                        const uint8_t* scan_extra_alpha = nullptr);
+
+  CFX_RetainPtr<CFX_DIBitmap> m_pBitmap;
+  const CFX_ClipRgn* m_pClipRgn;
+  FXDIB_Format m_SrcFormat;
+  int m_DestLeft;
+  int m_DestTop;
+  int m_DestWidth;
+  int m_DestHeight;
+  int m_BitmapAlpha;
+  uint32_t m_MaskColor;
+  CFX_RetainPtr<CFX_DIBitmap> m_pClipMask;
+  CFX_ScanlineCompositor m_Compositor;
+  bool m_bVertical;
+  bool m_bFlipX;
+  bool m_bFlipY;
+  int m_AlphaFlag;
+  void* m_pIccTransform;
+  bool m_bRgbByteOrder;
+  int m_BlendType;
+  uint8_t* m_pScanlineV;
+  uint8_t* m_pClipScanV;
+  uint8_t* m_pAddClipScan;
+  uint8_t* m_pScanlineAlphaV;
+};
+
+#endif  // CORE_FXGE_DIB_CFX_BITMAPCOMPOSER_H_