Skip the channel if there is no data.

core/fxcodec/codec/fx_codec_jpx_opj.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 <algorithm>
 #include <limits>
 #include <vector>
 
@@ skipping 817 matching lines @@
   }
   int width = image->comps[0].w;
   int height = image->comps[0].h;
   for (uint32_t channel = 0; channel < image->numcomps; ++channel) {
     uint8_t* pChannel = channel_bufs[channel];
     if (adjust_comps[channel] < 0) {
       for (int row = 0; row < height; ++row) {
         uint8_t* pScanline = pChannel + row * pitch;
         for (int col = 0; col < width; ++col) {
           uint8_t* pPixel = pScanline + col * image->numcomps;
+          if (!image->comps[channel].data)
+            continue;
+
           int src = image->comps[channel].data[row * width + col];
           src += image->comps[channel].sgnd
                      ? 1 << (image->comps[channel].prec - 1)
                      : 0;
           if (adjust_comps[channel] > 0) {
             *pPixel = 0;
           } else {
             *pPixel = (uint8_t)(src << -adjust_comps[channel]);
           }
         }
       }
     } else {
       for (int row = 0; row < height; ++row) {
         uint8_t* pScanline = pChannel + row * pitch;
         for (int col = 0; col < width; ++col) {
           uint8_t* pPixel = pScanline + col * image->numcomps;
-          if (!image->comps[channel].data) {
+          if (!image->comps[channel].data)
             continue;
-          }
+
           int src = image->comps[channel].data[row * width + col];
           src += image->comps[channel].sgnd
                      ? 1 << (image->comps[channel].prec - 1)
                      : 0;
           if (adjust_comps[channel] - 1 < 0) {
             *pPixel = (uint8_t)((src >> adjust_comps[channel]));
           } else {
             int tmpPixel = (src >> adjust_comps[channel]) +
                            ((src >> (adjust_comps[channel] - 1)) % 2);
             if (tmpPixel > 255) {
@@ skipping 30 matching lines @@
 bool CCodec_JpxModule::Decode(CJPX_Decoder* pDecoder,
                               uint8_t* dest_data,
                               int pitch,
                               const std::vector<uint8_t>& offsets) {
   return pDecoder->Decode(dest_data, pitch, offsets);
 }
 
 void CCodec_JpxModule::DestroyDecoder(CJPX_Decoder* pDecoder) {
   delete pDecoder;
 }