Line data    Source code

       1             : /******************************************************************************
       2             :  *
       3             :  * Project:  GeoTIFF Driver
       4             :  * Purpose:  GDAL GeoTIFF support.
       5             :  * Author:   Frank Warmerdam, warmerdam@pobox.com
       6             :  *
       7             :  ******************************************************************************
       8             :  * Copyright (c) 1998, 2002, Frank Warmerdam <warmerdam@pobox.com>
       9             :  * Copyright (c) 2007-2015, Even Rouault <even dot rouault at spatialys dot com>
      10             :  *
      11             :  * Permission is hereby granted, free of charge, to any person obtaining a
      12             :  * copy of this software and associated documentation files (the "Software"),
      13             :  * to deal in the Software without restriction, including without limitation
      14             :  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      15             :  * and/or sell copies of the Software, and to permit persons to whom the
      16             :  * Software is furnished to do so, subject to the following conditions:
      17             :  *
      18             :  * The above copyright notice and this permission notice shall be included
      19             :  * in all copies or substantial portions of the Software.
      20             :  *
      21             :  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
      22             :  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
      23             :  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
      24             :  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
      25             :  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
      26             :  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
      27             :  * DEALINGS IN THE SOFTWARE.
      28             :  ****************************************************************************/
      29             : 
      30             : #include "gtiffsplitband.h"
      31             : 
      32             : #include "gtiffdataset.h"
      33             : 
      34             : /************************************************************************/
      35             : /*                           GTiffSplitBand()                           */
      36             : /************************************************************************/
      37             : 
      38      131118 : GTiffSplitBand::GTiffSplitBand(GTiffDataset *poDSIn, int nBandIn)
      39      131118 :     : GTiffRasterBand(poDSIn, nBandIn)
      40             : {
      41      131118 :     nBlockXSize = poDS->GetRasterXSize();
      42      131118 :     nBlockYSize = 1;
      43      131118 : }
      44             : 
      45             : /************************************************************************/
      46             : /*                       IGetDataCoverageStatus()                       */
      47             : /************************************************************************/
      48             : 
      49           0 : int GTiffSplitBand::IGetDataCoverageStatus(int, int, int, int, int, double *)
      50             : {
      51             :     return GDAL_DATA_COVERAGE_STATUS_UNIMPLEMENTED |
      52           0 :            GDAL_DATA_COVERAGE_STATUS_DATA;
      53             : }
      54             : 
      55             : /************************************************************************/
      56             : /*                             IReadBlock()                             */
      57             : /************************************************************************/
      58             : 
      59       78291 : CPLErr GTiffSplitBand::IReadBlock(int /* nBlockXOff */, int nBlockYOff,
      60             :                                   void *pImage)
      61             : 
      62             : {
      63       78291 :     m_poGDS->Crystalize();
      64             : 
      65             :     // Optimization when reading the same line in a contig multi-band TIFF.
      66       78291 :     if (m_poGDS->m_nPlanarConfig == PLANARCONFIG_CONTIG &&
      67       48291 :         m_poGDS->nBands > 1 && m_poGDS->m_nLoadedBlock == nBlockYOff)
      68             :     {
      69        4011 :         goto extract_band_data;
      70             :     }
      71             : 
      72       74280 :     if (m_poGDS->m_nPlanarConfig == PLANARCONFIG_CONTIG && m_poGDS->nBands > 1)
      73             :     {
      74       40276 :         if (m_poGDS->m_pabyBlockBuf == nullptr)
      75             :         {
      76          14 :             m_poGDS->m_pabyBlockBuf = static_cast<GByte *>(
      77           7 :                 VSI_MALLOC_VERBOSE(TIFFScanlineSize(m_poGDS->m_hTIFF)));
      78           7 :             if (m_poGDS->m_pabyBlockBuf == nullptr)
      79             :             {
      80           1 :                 return CE_Failure;
      81             :             }
      82             :         }
      83             :     }
      84             :     else
      85             :     {
      86       34004 :         CPLAssert(TIFFScanlineSize(m_poGDS->m_hTIFF) == nBlockXSize);
      87             :     }
      88             : 
      89             :     /* -------------------------------------------------------------------- */
      90             :     /*      Read through to target scanline.                                */
      91             :     /* -------------------------------------------------------------------- */
      92       74279 :     if (m_poGDS->m_nLoadedBlock >= nBlockYOff)
      93          33 :         m_poGDS->m_nLoadedBlock = -1;
      94             : 
      95       74279 :     if (m_poGDS->m_nPlanarConfig == PLANARCONFIG_SEPARATE &&
      96       30000 :         m_poGDS->nBands > 1)
      97             :     {
      98             :         // If we change of band, we must start reading the
      99             :         // new strip from its beginning.
     100       30000 :         if (m_poGDS->m_nLastBandRead != nBand)
     101          20 :             m_poGDS->m_nLoadedBlock = -1;
     102       30000 :         m_poGDS->m_nLastBandRead = nBand;
     103             :     }
     104             : 
     105      203674 :     while (m_poGDS->m_nLoadedBlock < nBlockYOff)
     106             :     {
     107      129397 :         ++m_poGDS->m_nLoadedBlock;
     108      194550 :         if (TIFFReadScanline(m_poGDS->m_hTIFF,
     109       61149 :                              m_poGDS->m_pabyBlockBuf ? m_poGDS->m_pabyBlockBuf
     110             :                                                      : pImage,
     111      129397 :                              m_poGDS->m_nLoadedBlock,
     112      129397 :                              (m_poGDS->m_nPlanarConfig == PLANARCONFIG_SEPARATE)
     113       64244 :                                  ? static_cast<uint16_t>(nBand - 1)
     114      129399 :                                  : 0) == -1 &&
     115           2 :             !m_poGDS->m_bIgnoreReadErrors)
     116             :         {
     117           2 :             ReportError(CE_Failure, CPLE_AppDefined,
     118             :                         "TIFFReadScanline() failed.");
     119           2 :             m_poGDS->m_nLoadedBlock = -1;
     120           2 :             return CE_Failure;
     121             :         }
     122             :     }
     123             : 
     124       74277 : extract_band_data:
     125             :     /* -------------------------------------------------------------------- */
     126             :     /*      Extract band data from contig buffer.                           */
     127             :     /* -------------------------------------------------------------------- */
     128       78288 :     if (m_poGDS->m_pabyBlockBuf != nullptr)
     129             :     {
     130       44286 :         for (int iPixel = 0, iSrcOffset = nBand - 1, iDstOffset = 0;
     131      180732 :              iPixel < nBlockXSize;
     132      136446 :              ++iPixel, iSrcOffset += m_poGDS->nBands, ++iDstOffset)
     133             :         {
     134      136446 :             static_cast<GByte *>(pImage)[iDstOffset] =
     135      136446 :                 m_poGDS->m_pabyBlockBuf[iSrcOffset];
     136             :         }
     137             :     }
     138             : 
     139       78288 :     return CE_None;
     140             : }
     141             : 
     142             : /************************************************************************/
     143             : /*                            IWriteBlock()                             */
     144             : /************************************************************************/
     145             : 
     146           0 : CPLErr GTiffSplitBand::IWriteBlock(int /* nBlockXOff */, int /* nBlockYOff */,
     147             :                                    void * /* pImage */)
     148             : 
     149             : {
     150           0 :     ReportError(CE_Failure, CPLE_AppDefined, "Split bands are read-only.");
     151           0 :     return CE_Failure;
     152             : }