Fix FPDF_RenderPage 2x zoom in when bBackgroundAlphaNeeded is true

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 "../include/fsdk_define.h"
 #include "../include/fpdfview.h"
 #include "../include/fsdk_rendercontext.h"
 #include "../include/fpdf_progressive.h"
@@ skipping 440 matching lines @@
                 pBitmap->Clear(0x00ffffff);
 #ifdef _SKIA_SUPPORT_
                 pContext->m_pDevice = FX_NEW CFX_SkiaDevice;
                 ((CFX_SkiaDevice*)pContext->m_pDevice)->Attach((CFX_DIBitmap*)pBitmap);
 #else
                 pContext->m_pDevice = FX_NEW CFX_FxgeDevice;
                 ((CFX_FxgeDevice*)pContext->m_pDevice)->Attach((CFX_DIBitmap*)pBitmap);
 #endif
         }
         else
-        pContext->m_pDevice = FX_NEW CFX_WindowsDevice(dc);
+            pContext->m_pDevice = FX_NEW CFX_WindowsDevice(dc);
         if (flags & FPDF_NO_CATCH)
                 Func_RenderPage(pContext, page, start_x, start_y, size_x, size_y, rotate, flags,TRUE,NULL);
         else {
                 try {
                         Func_RenderPage(pContext, page, start_x, start_y, size_x, size_y, rotate, flags,TRUE,NULL);
                 } catch (...) {
                 }
         }
         if (bBackgroundAlphaNeeded) 
         {
                 if (pBitmap)
                 {
                         CFX_WindowsDevice WinDC(dc);
                         
                         if (WinDC.GetDeviceCaps(FXDC_DEVICE_CLASS) == FXDC_PRINTER)
                         {
                                 CFX_DIBitmap* pDst = FX_NEW CFX_DIBitmap;
                                 pDst->Create(pBitmap->GetWidth(), pBitmap->GetHeight(),FXDIB_Rgb32);
                                 FXSYS_memcpy(pDst->GetBuffer(), pBitmap->GetBuffer(), pBitmap->GetPitch()*pBitmap->GetHeight());
 //                              WinDC.SetDIBits(pDst,0,0);
-                                WinDC.StretchDIBits(pDst,0,0,size_x*2,size_y*2);
+                                WinDC.StretchDIBits(pDst,0,0,size_x,size_y);
                                 delete pDst;
                         }
                         else
                                 WinDC.SetDIBits(pBitmap,0,0);
 
                 }
         }
 #else
         // get clip region
         RECT rect, cliprect;
@@ skipping 401 matching lines @@
 {
         if (document == NULL)
                 return NULL;
         if (name == NULL || name[0] == 0) 
                 return NULL;
 
         CPDF_Document* pDoc = (CPDF_Document*)document;
         CPDF_NameTree name_tree(pDoc, FX_BSTRC("Dests"));
         return name_tree.LookupNamedDest(pDoc, name);
 }