Re-enable MSVC warning 4800 for compiling with chromium_code

core/src/fpdfapi/fpdf_render/fpdf_render_loadimage.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/src/fpdfapi/fpdf_render/render_int.h"
 
 #include <algorithm>
 #include <memory>
@@ skipping 610 matching lines @@
   const CPDF_Dictionary* pParams = m_pStreamAcc->GetImageParam();
   if (decoder == "CCITTFaxDecode") {
     m_pDecoder.reset(FPDFAPI_CreateFaxDecoder(src_data, src_size, m_Width,
                                               m_Height, pParams));
   } else if (decoder == "DCTDecode") {
     m_pDecoder.reset(CPDF_ModuleMgr::Get()->GetJpegModule()->CreateDecoder(
         src_data, src_size, m_Width, m_Height, m_nComponents,
         pParams ? pParams->GetIntegerBy("ColorTransform", 1) : 1));
     if (!m_pDecoder) {
       FX_BOOL bTransform = FALSE;
-      int comps, bpc;
+      int comps;
+      int bpc;
       ICodec_JpegModule* pJpegModule = CPDF_ModuleMgr::Get()->GetJpegModule();
       if (pJpegModule->LoadInfo(src_data, src_size, m_Width, m_Height, comps,
                                 bpc, bTransform)) {
-        if (m_nComponents != comps) {
+        if (m_nComponents != static_cast<FX_DWORD>(comps)) {
           FX_Free(m_pCompData);
-          m_nComponents = comps;
+          m_nComponents = static_cast<FX_DWORD>(comps);
           if (m_Family == PDFCS_LAB && m_nComponents != 3) {
             m_pCompData = nullptr;
             return 0;
           }
           m_pCompData = GetDecodeAndMaskArray(m_bDefaultDecode, m_bColorKey);
           if (!m_pCompData) {
             return 0;
           }
         }
         m_bpc = bpc;
@@ skipping 785 matching lines @@
 
 void CPDF_DIBSource::DownSampleScanline32Bit(int orig_Bpp,
                                              int dest_Bpp,
                                              FX_DWORD src_width,
                                              const uint8_t* pSrcLine,
                                              uint8_t* dest_scan,
                                              int dest_width,
                                              FX_BOOL bFlipX,
                                              int clip_left,
                                              int clip_width) const {
-  int last_src_x = -1;
+  // last_src_x used to store the last seen src_x position which should be
+  // in [0, src_width). Set the initial value to be an invalid src_x value.
+  FX_DWORD last_src_x = src_width;
   FX_ARGB last_argb = FXARGB_MAKE(0xFF, 0xFF, 0xFF, 0xFF);
   FX_FLOAT unit_To8Bpc = 255.0f / ((1 << m_bpc) - 1);
   for (int i = 0; i < clip_width; i++) {
     int dest_x = clip_left + i;
     FX_DWORD src_x = (bFlipX ? (dest_width - dest_x - 1) : dest_x) *
                      (int64_t)src_width / dest_width;
     src_x %= src_width;
 
     uint8_t* pDestPixel = dest_scan + i * dest_Bpp;
     FX_ARGB argb;
@@ skipping 190 matching lines @@
                                    IFX_Pause* pPause) {
   return LoadHandle->Continue(pPause);
 }
 
 CPDF_ImageLoader::~CPDF_ImageLoader() {
   if (!m_bCached) {
     delete m_pBitmap;
     delete m_pMask;
   }
 }