Fix integer overflow when stretching bitmap for printing

core/src/fxge/win32/fx_win32_device.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/fxge/fx_ge.h"
 #if _FX_OS_ == _FX_WIN32_DESKTOP_ || _FX_OS_ == _FX_WIN64_
 #include "../../../include/fxge/fx_ge_win32.h"
 #include <crtdbg.h>
@@ skipping 505 matching lines @@
 {
     CFX_DIBitmap* pBitmap = (CFX_DIBitmap*)pBitmap1;
     if (pBitmap == NULL) {
         return FALSE;
     }
     if ((pBitmap->IsCmykImage() || pIccTransform) &&
             !pBitmap->ConvertFormat(FXDIB_Rgb, pIccTransform)) {
         return FALSE;
     }
     CFX_ByteString info = CFX_WindowsDIB::GetBitmapInfo(pBitmap);
-    if (abs(dest_width) * abs(dest_height) < pBitmap1->GetWidth() * pBitmap1->GetHeight() * 4 ||
+    if ((FX_INT64)abs(dest_width) * abs(dest_height) < (FX_INT64)pBitmap1->GetWidth() * pBitmap1->GetHeight() * 4 ||
             (flags & FXDIB_INTERPOL) || (flags & FXDIB_BICUBIC_INTERPOL)) {
         SetStretchBltMode(m_hDC, HALFTONE);
     } else {
         SetStretchBltMode(m_hDC, COLORONCOLOR);
     }
     CFX_DIBitmap* pToStrechBitmap = pBitmap;
     bool del = false;
-    if (m_DeviceClass == FXDC_PRINTER && (pBitmap->GetWidth() * pBitmap->GetHeight() > abs(dest_width) * abs(dest_height))) {
+    if (m_DeviceClass == FXDC_PRINTER && ((FX_INT64)pBitmap->GetWidth() * pBitmap->GetHeight() > (FX_INT64)abs(dest_width) * abs(dest_height))) {
         pToStrechBitmap = pBitmap->StretchTo(dest_width, dest_height);
         del = true;
     }
     CFX_ByteString toStrechBitmapInfo = CFX_WindowsDIB::GetBitmapInfo(pToStrechBitmap);
     ::StretchDIBits(m_hDC, dest_left, dest_top, dest_width, dest_height,
                     0, 0, pToStrechBitmap->GetWidth(), pToStrechBitmap->GetHeight(), pToStrechBitmap->GetBuffer(),
                     (BITMAPINFO*)(FX_LPCSTR)toStrechBitmapInfo, DIB_RGB_COLORS, SRCCOPY);
     if (del) {
         delete pToStrechBitmap;
     }
@@ skipping 646 matching lines @@
     if (m_hDC) {
         SelectObject(m_hDC, m_hOldBitmap);
         DeleteDC(m_hDC);
     }
     if (m_hBitmap) {
         DeleteObject(m_hBitmap);
     }
     delete GetBitmap();
 }
 #endif