Support 16-bit images in downsampler.

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 "render_int.h"
 
 #include <algorithm>
 #include <memory>
@@ skipping 1455 matching lines @@
     } else {
       CFX_FixedBufGrow<uint8_t, 128> extracted_components(m_nComponents);
       if (m_bpc % 8 != 0) {
         uint64_t src_bit_pos = bit_offset;
         for (FX_DWORD j = 0; j < m_nComponents; ++j) {
           extracted_components[j] = static_cast<uint8_t>(
               GetBits8(pSrcPixel, src_bit_pos, m_bpc) * unit_To8Bpc);
           src_bit_pos += m_bpc;
         }
         pSrcPixel = extracted_components;
+      } else if (m_bpc == 16) {
+        for (FX_DWORD j = 0; j < m_nComponents; ++j) {
+          extracted_components[j] = pSrcPixel[j * 2];
+        }
+        pSrcPixel = extracted_components;
       }
 
       if (m_pColorSpace) {
         uint8_t color[4];
         const FX_BOOL bTransMask = TransMask();
         if (m_bDefaultDecode) {
           m_pColorSpace->TranslateImageLine(color, pSrcPixel, 1, 0, 0,
                                             bTransMask);
         } else {
           for (FX_DWORD j = 0; j < m_nComponents; ++j) {
@@ skipping 155 matching lines @@
                                    IFX_Pause* pPause) {
   return LoadHandle->Continue(pPause);
 }
 
 CPDF_ImageLoader::~CPDF_ImageLoader() {
   if (!m_bCached) {
     delete m_pBitmap;
     delete m_pMask;
   }
 }