Line data    Source code

       1             : /******************************************************************************
       2             :  *
       3             :  * Purpose:  Implementation of the CPixelInterleavedChannel class.
       4             :  *
       5             :  ******************************************************************************
       6             :  * Copyright (c) 2009
       7             :  * PCI Geomatics, 90 Allstate Parkway, Markham, Ontario, Canada.
       8             :  *
       9             :  * SPDX-License-Identifier: MIT
      10             :  ****************************************************************************/
      11             : 
      12             : #include "pcidsk_exception.h"
      13             : #include "core/pcidsk_utils.h"
      14             : #include "core/cpcidskfile.h"
      15             : #include "channel/cpixelinterleavedchannel.h"
      16             : #include <cassert>
      17             : #include <cstring>
      18             : 
      19             : using namespace PCIDSK;
      20             : 
      21             : /************************************************************************/
      22             : /*                      CPixelInterleavedChannel()                      */
      23             : /************************************************************************/
      24             : 
      25           0 : CPixelInterleavedChannel::CPixelInterleavedChannel( PCIDSKBuffer &image_headerIn,
      26             :                                                     uint64 ih_offsetIn,
      27             :                                                     CPL_UNUSED PCIDSKBuffer &file_headerIn,
      28             :                                                     int channelnumIn,
      29             :                                                     CPCIDSKFile *fileIn,
      30             :                                                     int image_offsetIn,
      31           0 :                                                     eChanType pixel_typeIn )
      32           0 :         : CPCIDSKChannel( image_headerIn, ih_offsetIn, fileIn, pixel_typeIn, channelnumIn)
      33             : 
      34             : {
      35           0 :     this->image_offset = image_offsetIn;
      36           0 : }
      37             : 
      38             : /************************************************************************/
      39             : /*                     ~CPixelInterleavedChannel()                      */
      40             : /************************************************************************/
      41             : 
      42           0 : CPixelInterleavedChannel::~CPixelInterleavedChannel()
      43             : 
      44             : {
      45           0 : }
      46             : 
      47             : /************************************************************************/
      48             : /*                             ReadBlock()                              */
      49             : /************************************************************************/
      50             : 
      51           0 : int CPixelInterleavedChannel::ReadBlock( int block_index, void *buffer,
      52             :                                          int win_xoff, int win_yoff,
      53             :                                          int win_xsize, int win_ysize )
      54             : 
      55             : {
      56             : /* -------------------------------------------------------------------- */
      57             : /*      Default window if needed.                                       */
      58             : /* -------------------------------------------------------------------- */
      59           0 :     if( win_xoff == -1 && win_yoff == -1 && win_xsize == -1 && win_ysize == -1 )
      60             :     {
      61           0 :         win_xoff = 0;
      62           0 :         win_yoff = 0;
      63           0 :         win_xsize = GetBlockWidth();
      64           0 :         win_ysize = GetBlockHeight();
      65             :     }
      66             : 
      67             : /* -------------------------------------------------------------------- */
      68             : /*      Validate Window                                                 */
      69             : /* -------------------------------------------------------------------- */
      70           0 :     if( win_xoff < 0 || win_xoff + win_xsize > GetBlockWidth()
      71           0 :         || win_yoff < 0 || win_yoff + win_ysize > GetBlockHeight() )
      72             :     {
      73           0 :         return ThrowPCIDSKException(0,
      74             :             "Invalid window in ReadBloc(): win_xoff=%d,win_yoff=%d,xsize=%d,ysize=%d",
      75           0 :             win_xoff, win_yoff, win_xsize, win_ysize );
      76             :     }
      77             : 
      78             : /* -------------------------------------------------------------------- */
      79             : /*      Work out sizes and offsets.                                     */
      80             : /* -------------------------------------------------------------------- */
      81           0 :     int pixel_group = file->GetPixelGroupSize();
      82           0 :     int pixel_size = DataTypeSize(GetType());
      83             : 
      84             : /* -------------------------------------------------------------------- */
      85             : /*      Read and lock the scanline.                                     */
      86             : /* -------------------------------------------------------------------- */
      87             :     uint8 *pixel_buffer = (uint8 *)
      88           0 :         file->ReadAndLockBlock( block_index, win_xoff, win_xsize);
      89             : 
      90             : /* -------------------------------------------------------------------- */
      91             : /*      Copy the data into our callers buffer.  Try to do this          */
      92             : /*      reasonably efficiently.  We might consider adding faster        */
      93             : /*      cases for 16/32bit data that is word aligned.                   */
      94             : /* -------------------------------------------------------------------- */
      95           0 :     if( pixel_size == pixel_group )
      96           0 :         memcpy( buffer, pixel_buffer, static_cast<size_t>(pixel_size) * win_xsize );
      97             :     else
      98             :     {
      99             :         int i;
     100           0 :         uint8  *src = ((uint8 *)pixel_buffer) + image_offset;
     101           0 :         uint8  *dst = (uint8 *) buffer;
     102             : 
     103           0 :         if( pixel_size == 1 )
     104             :         {
     105           0 :             for( i = win_xsize; i != 0; i-- )
     106             :             {
     107           0 :                 *dst = *src;
     108           0 :                 dst++;
     109           0 :                 src += pixel_group;
     110             :             }
     111             :         }
     112           0 :         else if( pixel_size == 2 )
     113             :         {
     114           0 :             for( i = win_xsize; i != 0; i-- )
     115             :             {
     116           0 :                 *(dst++) = *(src++);
     117           0 :                 *(dst++) = *(src++);
     118           0 :                 src += pixel_group-2;
     119             :             }
     120             :         }
     121           0 :         else if( pixel_size == 4 )
     122             :         {
     123           0 :             for( i = win_xsize; i != 0; i-- )
     124             :             {
     125           0 :                 *(dst++) = *(src++);
     126           0 :                 *(dst++) = *(src++);
     127           0 :                 *(dst++) = *(src++);
     128           0 :                 *(dst++) = *(src++);
     129           0 :                 src += pixel_group-4;
     130             :             }
     131             :         }
     132           0 :         else if( pixel_size == 8 )
     133             :         {
     134           0 :             for( i = win_xsize; i != 0; i-- )
     135             :             {
     136           0 :                 *(dst++) = *(src++);
     137           0 :                 *(dst++) = *(src++);
     138           0 :                 *(dst++) = *(src++);
     139           0 :                 *(dst++) = *(src++);
     140           0 :                 *(dst++) = *(src++);
     141           0 :                 *(dst++) = *(src++);
     142           0 :                 *(dst++) = *(src++);
     143           0 :                 *(dst++) = *(src++);
     144           0 :                 src += pixel_group-8;
     145             :             }
     146             :         }
     147             :         else
     148           0 :             return ThrowPCIDSKException(0, "Unsupported pixel type..." );
     149             :     }
     150             : 
     151           0 :     file->UnlockBlock( false );
     152             : 
     153             : /* -------------------------------------------------------------------- */
     154             : /*      Do byte swapping if needed.                                     */
     155             : /* -------------------------------------------------------------------- */
     156           0 :     if( needs_swap )
     157           0 :         SwapPixels( buffer, pixel_type, win_xsize );
     158             : 
     159           0 :     return 1;
     160             : }
     161             : 
     162             : /************************************************************************/
     163             : /*                             CopyPixels()                             */
     164             : /************************************************************************/
     165             : 
     166             : template <typename T>
     167             : void CopyPixels(const T* const src, T* const dst,
     168             :                 std::size_t offset, std::size_t count)
     169             : {
     170             :     for (std::size_t i = 0; i < count; i++)
     171             :     {
     172             :         dst[i] = src[(i + 1) * offset];
     173             :     }
     174             : }
     175             : 
     176             : /************************************************************************/
     177             : /*                             WriteBlock()                             */
     178             : /************************************************************************/
     179             : 
     180           0 : int CPixelInterleavedChannel::WriteBlock( int block_index, void *buffer )
     181             : 
     182             : {
     183           0 :     if( !file->GetUpdatable() )
     184           0 :         return ThrowPCIDSKException(0, "File not open for update in WriteBlock()" );
     185             : 
     186           0 :     InvalidateOverviews();
     187             : 
     188             : /* -------------------------------------------------------------------- */
     189             : /*      Work out sizes and offsets.                                     */
     190             : /* -------------------------------------------------------------------- */
     191           0 :     int pixel_group = file->GetPixelGroupSize();
     192           0 :     int pixel_size = DataTypeSize(GetType());
     193             : 
     194             : /* -------------------------------------------------------------------- */
     195             : /*      Read and lock the scanline.                                     */
     196             : /* -------------------------------------------------------------------- */
     197           0 :     uint8 *pixel_buffer = (uint8 *) file->ReadAndLockBlock( block_index );
     198             : 
     199             : /* -------------------------------------------------------------------- */
     200             : /*      Copy the data into our callers buffer.  Try to do this          */
     201             : /*      reasonably efficiently.  We might consider adding faster        */
     202             : /*      cases for 16/32bit data that is word aligned.                   */
     203             : /* -------------------------------------------------------------------- */
     204           0 :     if( pixel_size == pixel_group )
     205             :     {
     206           0 :         memcpy( pixel_buffer, buffer, static_cast<size_t>(pixel_size) * width );
     207             : 
     208           0 :         if( needs_swap )
     209             :         {
     210           0 :             bool complex = IsDataTypeComplex( GetType() );
     211             : 
     212           0 :             if( complex )
     213           0 :                 SwapData( pixel_buffer, pixel_size/2, width*2 );
     214             :             else
     215           0 :                 SwapData( pixel_buffer, pixel_size, width );
     216             :         }
     217             :     }
     218             :     else
     219             :     {
     220             :         int i;
     221           0 :         uint8  *dst = ((uint8 *)pixel_buffer) + image_offset;
     222           0 :         uint8  *src = (uint8 *) buffer;
     223             : 
     224           0 :         if( pixel_size == 1 )
     225             :         {
     226           0 :             for( i = width; i != 0; i-- )
     227             :             {
     228           0 :                 *dst = *src;
     229           0 :                 src++;
     230           0 :                 dst += pixel_group;
     231             :             }
     232             :         }
     233           0 :         else if( pixel_size == 2 )
     234             :         {
     235           0 :             for( i = width; i != 0; i-- )
     236             :             {
     237           0 :                 *(dst++) = *(src++);
     238           0 :                 *(dst++) = *(src++);
     239             : 
     240           0 :                 if( needs_swap )
     241           0 :                     SwapData( dst-2, 2, 1 );
     242             : 
     243           0 :                 dst += pixel_group-2;
     244             :             }
     245             :         }
     246           0 :         else if( pixel_size == 4 )
     247             :         {
     248           0 :             bool complex = IsDataTypeComplex( GetType() );
     249             : 
     250           0 :             for( i = width; i != 0; i-- )
     251             :             {
     252           0 :                 *(dst++) = *(src++);
     253           0 :                 *(dst++) = *(src++);
     254           0 :                 *(dst++) = *(src++);
     255           0 :                 *(dst++) = *(src++);
     256             : 
     257           0 :                 if( needs_swap )
     258             :                 {
     259           0 :                     if( complex )
     260           0 :                         SwapData( dst-4, 2, 2);
     261             :                     else
     262           0 :                         SwapData( dst-4, 4, 1);
     263             :                 }
     264             : 
     265           0 :                 dst += pixel_group-4;
     266             :             }
     267             :         }
     268           0 :         else if( pixel_size == 8 )
     269             :         {
     270           0 :             bool complex = IsDataTypeComplex( GetType() );
     271             : 
     272           0 :             for( i = width; i != 0; i-- )
     273             :             {
     274           0 :                 *(dst++) = *(src++);
     275           0 :                 *(dst++) = *(src++);
     276           0 :                 *(dst++) = *(src++);
     277           0 :                 *(dst++) = *(src++);
     278           0 :                 *(dst++) = *(src++);
     279           0 :                 *(dst++) = *(src++);
     280           0 :                 *(dst++) = *(src++);
     281           0 :                 *(dst++) = *(src++);
     282             : 
     283           0 :                 if( needs_swap )
     284             :                 {
     285           0 :                     if( complex )
     286           0 :                         SwapData( dst-8, 4, 2);
     287             :                     else
     288           0 :                         SwapData( dst-8, 8, 1);
     289             :                 }
     290             : 
     291           0 :                 dst += pixel_group-8;
     292             :             }
     293             :         }
     294             :         else
     295           0 :             return ThrowPCIDSKException(0, "Unsupported pixel type..." );
     296             :     }
     297             : 
     298           0 :     file->UnlockBlock( true );
     299             : 
     300           0 :     return 1;
     301             : }