Merge to XFA: Introduce CPDFPageFromFPFDPage()

fpdfsdk/src/fpdfview.cpp

 // 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
 
 #include "../../core/include/fpdfapi/fpdf_module.h"
 #include "../../core/include/fxcodec/fx_codec.h"
 #include "../../core/include/fxcrt/fx_safe_types.h"
 #include "../../public/fpdf_ext.h"
 #include "../../public/fpdf_formfill.h"
 #include "../../public/fpdf_progressive.h"
 #include "../../public/fpdfview.h"
 #include "../../third_party/base/nonstd_unique_ptr.h"
 #include "../../third_party/base/numerics/safe_conversions_impl.h"
 #include "../include/fsdk_define.h"
 #include "../include/fsdk_mgr.h"
 #include "../include/fsdk_rendercontext.h"
 #include "../include/fpdfxfa/fpdfxfa_doc.h"
 #include "../include/fpdfxfa/fpdfxfa_app.h"
 #include "../include/fpdfxfa/fpdfxfa_page.h"
 #include "../include/fpdfxfa/fpdfxfa_util.h"
 #include "../include/javascript/IJavaScript.h"
 
 CPDF_Document* CPDFDocumentFromFPDFDocument(FPDF_DOCUMENT doc) {
   return doc ? static_cast<CPDFXFA_Document*>(doc)->GetPDFDoc() : nullptr;
 }
 
+CPDF_Page* CPDFPageFromFPDFPage(FPDF_PAGE page) {
+  return page ? static_cast<CPDFXFA_Page*>(page)->GetPDFPage() : nullptr;
+}
+
 CFPDF_FileStream::CFPDF_FileStream(FPDF_FILEHANDLER* pFS) {
   m_pFS = pFS;
   m_nCurPos = 0;
 }
 
 IFX_FileStream* CFPDF_FileStream::Retain() {
   return this;
 }
 
 void CFPDF_FileStream::Release() {
@@ skipping 390 matching lines @@
   if (page_index < 0 || page_index >= FPDF_GetPageCount(document))
     return nullptr;
 
   return pDoc->GetPage(page_index);
 }
 
 DLLEXPORT double STDCALL FPDF_GetPageWidth(FPDF_PAGE page) {
   if (!page)
     return 0.0;
   return ((CPDFXFA_Page*)page)->GetPageWidth();
-  //    return ((CPDF_Page*)page)->GetPageWidth();
 }
 
 DLLEXPORT double STDCALL FPDF_GetPageHeight(FPDF_PAGE page) {
   if (!page)
     return 0.0;
-  //    return ((CPDF_Page*)page)->GetPageHeight();
   return ((CPDFXFA_Page*)page)->GetPageHeight();
 }
 
 void DropContext(void* data) {
   delete (CRenderContext*)data;
 }
 
 #if defined(_DEBUG) || defined(DEBUG)
 #define DEBUG_TRACE
 #endif
 
 #if defined(_WIN32)
 DLLEXPORT void STDCALL FPDF_RenderPage(HDC dc,
                                        FPDF_PAGE page,
                                        int start_x,
                                        int start_y,
                                        int size_x,
                                        int size_y,
                                        int rotate,
                                        int flags) {
-  if (page == NULL)
-    return;
-  CPDF_Page* pPage = ((CPDFXFA_Page*)page)->GetPDFPage();
+  CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
   if (!pPage)
     return;
 
   CRenderContext* pContext = new CRenderContext;
   pPage->SetPrivateData((void*)1, pContext, DropContext);
 
 #ifndef _WIN32_WCE
   CFX_DIBitmap* pBitmap = NULL;
   FX_BOOL bBackgroundAlphaNeeded = FALSE;
   bBackgroundAlphaNeeded = pPage->BackgroundAlphaNeeded();
@@ skipping 139 matching lines @@
 #endif
 
 DLLEXPORT void STDCALL FPDF_RenderPageBitmap(FPDF_BITMAP bitmap,
                                              FPDF_PAGE page,
                                              int start_x,
                                              int start_y,
                                              int size_x,
                                              int size_y,
                                              int rotate,
                                              int flags) {
-  if (bitmap == NULL || page == NULL)
+  if (!bitmap)
     return;
-  CPDF_Page* pPage = ((CPDFXFA_Page*)page)->GetPDFPage();
+  CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
   if (!pPage)
     return;
-
   CRenderContext* pContext = new CRenderContext;
   pPage->SetPrivateData((void*)1, pContext, DropContext);
 #ifdef _SKIA_SUPPORT_
   pContext->m_pDevice = new CFX_SkiaDevice;
 
   if (flags & FPDF_REVERSE_BYTE_ORDER)
     ((CFX_SkiaDevice*)pContext->m_pDevice)
         ->Attach((CFX_DIBitmap*)bitmap, 0, TRUE);
   else
     ((CFX_SkiaDevice*)pContext->m_pDevice)->Attach((CFX_DIBitmap*)bitmap);
@@ skipping 51 matching lines @@
 DLLEXPORT void STDCALL FPDF_PageToDevice(FPDF_PAGE page,
                                          int start_x,
                                          int start_y,
                                          int size_x,
                                          int size_y,
                                          int rotate,
                                          double page_x,
                                          double page_y,
                                          int* device_x,
                                          int* device_y) {
-  if (page == NULL || device_x == NULL || device_y == NULL)
+  if (!device_x || !device_y)
     return;
   CPDFXFA_Page* pPage = (CPDFXFA_Page*)page;
+  if (!pPage)
+    return;
   pPage->PageToDevice(start_x, start_y, size_x, size_y, rotate, page_x, page_y,
                       device_x, device_y);
 }
 
 DLLEXPORT FPDF_BITMAP STDCALL FPDFBitmap_Create(int width,
                                                 int height,
                                                 int alpha) {
   nonstd::unique_ptr<CFX_DIBitmap> pBitmap(new CFX_DIBitmap);
   if (!pBitmap->Create(width, height, alpha ? FXDIB_Argb : FXDIB_Rgb32)) {
     return NULL;
@@ skipping 79 matching lines @@
 void FPDF_RenderPage_Retail(CRenderContext* pContext,
                             FPDF_PAGE page,
                             int start_x,
                             int start_y,
                             int size_x,
                             int size_y,
                             int rotate,
                             int flags,
                             FX_BOOL bNeedToRestore,
                             IFSDK_PAUSE_Adapter* pause) {
-  CPDF_Page* pPage = ((CPDFXFA_Page*)page)->GetPDFPage();
-  if (pPage == NULL)
+  CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
+  if (!pPage)
     return;
 
   if (!pContext->m_pOptions)
     pContext->m_pOptions = new CPDF_RenderOptions;
 
   if (flags & FPDF_LCD_TEXT)
     pContext->m_pOptions->m_Flags |= RENDER_CLEARTYPE;
   else
     pContext->m_pOptions->m_Flags &= ~RENDER_CLEARTYPE;
   if (flags & FPDF_NO_NATIVETEXT)
@@ skipping 245 matching lines @@
   if (!buffer) {
     *buflen = len;
   } else if (*buflen >= len) {
     memcpy(buffer, utf16Name.c_str(), len);
     *buflen = len;
   } else {
     *buflen = -1;
   }
   return (FPDF_DEST)pDestObj;
 }