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diff --git a/fpdfsdk/include/fpdf_progressive.h b/fpdfsdk/include/fpdf_progressive.h
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+++ b/fpdfsdk/include/fpdf_progressive.h
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+// Copyright 2014 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 _FPDF_PROGRESSIVE_H_
+#define _FPDF_PROGRESSIVE_H_
+
+#include "fpdfview.h"
+
+//Flags for progressive process status.
+#define FPDF_RENDER_READER			0
+#define FPDF_RENDER_TOBECOUNTINUED	1
+#define FPDF_RENDER_DONE			2
+#define FPDF_RENDER_FAILED			3
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+//IFPDF_RENDERINFO interface.
+typedef struct _IFSDK_PAUSE
+{
+	/**
+	* Version number of the interface. Currently must be 1.
+	**/
+	int version;
+
+	/*
+	* Method: NeedToPauseNow
+	*			Check if we need to pause a progressive process now.
+	* Interface Version:
+	*			1
+	* Implementation Required:
+	*			yes
+	* Parameters:
+	*			pThis		-	Pointer to the interface structure itself
+	* Return Value:
+	*			 Non-zero for pause now, 0 for continue.
+	*
+	*/
+	FPDF_BOOL (*NeedToPauseNow) (struct _IFSDK_PAUSE* pThis);
+	
+	//A user defined data pointer, used by user's application. Can be NULL.
+	void*		user;
+} IFSDK_PAUSE;
+
+// Function: FPDF_RenderPageBitmap_Start
+//			Start to render page contents to a device independent bitmap progressively.
+// Parameters: 
+//			bitmap		-	Handle to the device independent bitmap (as the output buffer).
+//							Bitmap handle can be created by FPDFBitmap_Create function.
+//			page		-	Handle to the page. Returned by FPDF_LoadPage function.
+//			start_x		-	Left pixel position of the display area in the bitmap coordinate.
+//			start_y		-	Top pixel position of the display area in the bitmap coordinate.
+//			size_x		-	Horizontal size (in pixels) for displaying the page.
+//			size_y		-	Vertical size (in pixels) for displaying the page.
+//			rotate		-	Page orientation: 0 (normal), 1 (rotated 90 degrees clockwise),
+//								2 (rotated 180 degrees), 3 (rotated 90 degrees counter-clockwise).
+//			flags		-	0 for normal display, or combination of flags defined above.
+//			pause		-	The IFSDK_PAUSE interface.A callback mechanism allowing the page rendering process
+// Return value:
+//			Rendering Status. See flags for progressive process status for the details.
+//
+DLLEXPORT int STDCALL FPDF_RenderPageBitmap_Start(FPDF_BITMAP bitmap, FPDF_PAGE page, int start_x, int start_y, int size_x,
+												   int size_y, int rotate, int flags,IFSDK_PAUSE * pause);
+
+// Function: FPDF_RenderPage_Continue
+//			Continue rendering a PDF page.
+// Parameters: 
+//			page		-	Handle to the page. Returned by FPDF_LoadPage function.
+//			pause		-	The IFSDK_PAUSE interface.A callback mechanism allowing the page rendering process
+//							to be paused before it's finished. This can be NULL if you don't want to pause.
+// Return value:
+//			The rendering status. See flags for progressive process status for the details.
+DLLEXPORT int STDCALL FPDF_RenderPage_Continue(FPDF_PAGE page,IFSDK_PAUSE * pause);
+
+// Function: FPDF_RenderPage_Close
+//			Release the resource allocate during page rendering. Need to be called after finishing rendering or
+//			cancel the rendering.
+// Parameters: 
+//			page		-	Handle to the page. Returned by FPDF_LoadPage function.
+// Return value:
+//			NULL
+DLLEXPORT void STDCALL FPDF_RenderPage_Close(FPDF_PAGE page);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif	//_FPDF_PROGRESSIVE_H_