Keep the declaration of FPDF_HasXFAField consistent with other XFA APIs

fpdfsdk/include/fpdfformfill.h

 // 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 _FPDFORMFILL_H
 #define _FPDFORMFILL_H
 #include "fpdfview.h"
 
 typedef void* FPDF_FORMHANDLE;
 
+#define DOCTYPE_PDF          0 //Normal pdf Document
+#define DOCTYPE_DYNIMIC_XFA  1 //Dynimic xfa Document Type
+#define DOCTYPE_STATIC_XFA   2 //Static xfa Document Type
+
 // Exported Functions
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 typedef struct _IPDF_JsPlatform
 {
 /**
 * Version number of the interface. Currently must be 1.
         **/
@@ skipping 1063 matching lines @@
 *                       flags           -       0 for normal display, or combination of flags defined above. 
 * Return Value:
 *                       None.
 * Comments: 
 *                       This method is designed to only render annotations and FormFields on the page. 
 *                       Without FPDF_ANNOT specified for flags, Rendering functions such as FPDF_RenderPageBitmap or FPDF_RenderPageBitmap_Start will only render page contents(without annotations) to a bitmap.
 *                       In order to implement the FormFill functions,Implementation should call this method after rendering functions finish rendering the page contents.
 **/
 DLLEXPORT void STDCALL FPDF_FFLDraw(FPDF_FORMHANDLE hHandle,FPDF_BITMAP bitmap, FPDF_PAGE page, int start_x, int start_y, 
                                                 int size_x, int size_y, int rotate, int flags);
+/**
+ * Function: FPDF_HasXFAField
+ *                      This method is designed to check whether a pdf document has XFA fields.
+ * Parameters:
+ *                      document                -       Handle to document. Returned by FPDF_LoadDocument function.
+ *                      docType                 -       Document type defined as DOCTYPE_xxx.
+ * Return Value:
+ *                      TRUE indicates that the input document has XFA fields, otherwise FALSE.
+ **/
+DLLEXPORT FPDF_BOOL STDCALL FPDF_HasXFAField(FPDF_DOCUMENT document, int& docType);
 
 /**
  * Function: FPDF_LoadXFA
  *                      If the document consists of XFA fields, there should call this method to load XFA fields.
  * Parameters:
  *                      document                -       Handle to document. Returned by FPDF_LoadDocument function.
  * Return Value:
  *                      TRUE indicates success,otherwise FALSE.
  **/
 DLLEXPORT FPDF_BOOL STDCALL FPDF_LoadXFA(FPDF_DOCUMENT document);
@@ skipping 131 matching lines @@
  *                      TRUE indicates success, otherwise FALSE.
  **/
 DLLEXPORT FPDF_BOOL STDCALL FPDF_StringHandleAddString(FPDF_STRINGHANDLE stringHandle, FPDF_BYTESTRING bsText, FPDF_DWORD size);
 
 #ifdef __cplusplus
 };
 #endif
 
 #endif //_FPDFORMFILL_H