Sanity check the values of TRUE and FALSE.

core/src/fxge/dib/fx_dib_convert.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_dib.h"
 #include "../../../include/fxge/fx_ge.h"
 #include "../../../include/fxcodec/fx_codec.h"
 const FX_DWORD g_dwWinPalette[256] = {
@@ skipping 1078 matching lines @@
     }
     return pClone;
   }
   CFX_DIBitmap* pClone = new CFX_DIBitmap;
   if (!pClone->Create(m_Width, m_Height, dest_format)) {
     delete pClone;
     return NULL;
   }
   FX_BOOL ret = TRUE;
   CFX_DIBitmap* pSrcAlpha = NULL;
-  if (m_AlphaFlag & 2) {
+  if (HasAlpha()) {
     pSrcAlpha = (GetFormat() == FXDIB_Argb) ? GetAlphaMask() : m_pAlphaMask;
     if (pSrcAlpha == NULL) {
       delete pClone;
       return NULL;
     }
   }
   if (dest_format & 0x0200) {
     if (dest_format == FXDIB_Argb)
       ret = pSrcAlpha ? pClone->LoadChannel(FXDIB_Alpha, pSrcAlpha, FXDIB_Alpha)
                       : pClone->LoadChannel(FXDIB_Alpha, 0xff);
@@ skipping 107 matching lines @@
   if (!m_bExtBuf) {
     FX_Free(m_pBuffer);
   }
   m_bExtBuf = FALSE;
   m_pBuffer = dest_buf;
   m_bpp = (uint8_t)dest_format;
   m_AlphaFlag = (uint8_t)(dest_format >> 8);
   m_Pitch = dest_pitch;
   return TRUE;
 }