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Diffstat (limited to 'tiff/contrib/addtiffo/tif_overview.c')
| -rw-r--r-- | tiff/contrib/addtiffo/tif_overview.c | 896 |
1 files changed, 896 insertions, 0 deletions
diff --git a/tiff/contrib/addtiffo/tif_overview.c b/tiff/contrib/addtiffo/tif_overview.c new file mode 100644 index 0000000..994451c --- /dev/null +++ b/tiff/contrib/addtiffo/tif_overview.c @@ -0,0 +1,896 @@ +/****************************************************************************** + * tif_overview.c,v 1.9 2005/05/25 09:03:16 dron Exp + * + * Project: TIFF Overview Builder + * Purpose: Library function for building overviews in a TIFF file. + * Author: Frank Warmerdam, warmerdam@pobox.com + * + * Notes: + * o Currently only images with bits_per_sample of a multiple of eight + * will work. + * + * o The downsampler currently just takes the top left pixel from the + * source rectangle. Eventually sampling options of averaging, mode, and + * ``center pixel'' should be offered. + * + * o The code will attempt to use the same kind of compression, + * photometric interpretation, and organization as the source image, but + * it doesn't copy geotiff tags to the reduced resolution images. + * + * o Reduced resolution overviews for multi-sample files will currently + * always be generated as PLANARCONFIG_SEPARATE. This could be fixed + * reasonable easily if needed to improve compatibility with other + * packages. Many don't properly support PLANARCONFIG_SEPARATE. + * + ****************************************************************************** + * Copyright (c) 1999, Frank Warmerdam + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included + * in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + ****************************************************************************** + */ + +/* TODO: update notes in header above */ + +#include <stdio.h> +#include <assert.h> +#include <stdlib.h> +#include <string.h> + +#include "tiffio.h" +#include "tif_ovrcache.h" + +#ifndef FALSE +# define FALSE 0 +# define TRUE 1 +#endif + +#ifndef MAX +# define MIN(a,b) ((a<b) ? a : b) +# define MAX(a,b) ((a>b) ? a : b) +#endif + +void TIFFBuildOverviews( TIFF *, int, int *, int, const char *, + int (*)(double,void*), void * ); + +/************************************************************************/ +/* TIFF_WriteOverview() */ +/* */ +/* Create a new directory, without any image data for an overview. */ +/* Returns offset of newly created overview directory, but the */ +/* current directory is reset to be the one in used when this */ +/* function is called. */ +/************************************************************************/ + +uint32 TIFF_WriteOverview( TIFF *hTIFF, int nXSize, int nYSize, + int nBitsPerPixel, int nPlanarConfig, int nSamples, + int nBlockXSize, int nBlockYSize, + int bTiled, int nCompressFlag, int nPhotometric, + int nSampleFormat, + unsigned short *panRed, + unsigned short *panGreen, + unsigned short *panBlue, + int bUseSubIFDs, + int nHorSubsampling, int nVerSubsampling ) + +{ + uint32 nBaseDirOffset; + uint32 nOffset; + + nBaseDirOffset = TIFFCurrentDirOffset( hTIFF ); + + TIFFCreateDirectory( hTIFF ); + +/* -------------------------------------------------------------------- */ +/* Setup TIFF fields. */ +/* -------------------------------------------------------------------- */ + TIFFSetField( hTIFF, TIFFTAG_IMAGEWIDTH, nXSize ); + TIFFSetField( hTIFF, TIFFTAG_IMAGELENGTH, nYSize ); + if( nSamples == 1 ) + TIFFSetField( hTIFF, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG ); + else + TIFFSetField( hTIFF, TIFFTAG_PLANARCONFIG, nPlanarConfig ); + + TIFFSetField( hTIFF, TIFFTAG_BITSPERSAMPLE, nBitsPerPixel ); + TIFFSetField( hTIFF, TIFFTAG_SAMPLESPERPIXEL, nSamples ); + TIFFSetField( hTIFF, TIFFTAG_COMPRESSION, nCompressFlag ); + TIFFSetField( hTIFF, TIFFTAG_PHOTOMETRIC, nPhotometric ); + TIFFSetField( hTIFF, TIFFTAG_SAMPLEFORMAT, nSampleFormat ); + + if( bTiled ) + { + TIFFSetField( hTIFF, TIFFTAG_TILEWIDTH, nBlockXSize ); + TIFFSetField( hTIFF, TIFFTAG_TILELENGTH, nBlockYSize ); + } + else + TIFFSetField( hTIFF, TIFFTAG_ROWSPERSTRIP, nBlockYSize ); + + TIFFSetField( hTIFF, TIFFTAG_SUBFILETYPE, FILETYPE_REDUCEDIMAGE ); + + if( nPhotometric == PHOTOMETRIC_YCBCR || nPhotometric == PHOTOMETRIC_ITULAB ) + { + TIFFSetField( hTIFF, TIFFTAG_YCBCRSUBSAMPLING, nHorSubsampling, nVerSubsampling); + /* TODO: also write YCbCrPositioning and YCbCrCoefficients tag identical to source IFD */ + } + /* TODO: add command-line parameter for selecting jpeg compression quality + * that gets ignored when compression isn't jpeg */ + +/* -------------------------------------------------------------------- */ +/* Write color table if one is present. */ +/* -------------------------------------------------------------------- */ + if( panRed != NULL ) + { + TIFFSetField( hTIFF, TIFFTAG_COLORMAP, panRed, panGreen, panBlue ); + } + +/* -------------------------------------------------------------------- */ +/* Write directory, and return byte offset. */ +/* -------------------------------------------------------------------- */ + if( TIFFWriteCheck( hTIFF, bTiled, "TIFFBuildOverviews" ) == 0 ) + return 0; + + TIFFWriteDirectory( hTIFF ); + TIFFSetDirectory( hTIFF, (tdir_t) (TIFFNumberOfDirectories(hTIFF)-1) ); + + nOffset = TIFFCurrentDirOffset( hTIFF ); + + TIFFSetSubDirectory( hTIFF, nBaseDirOffset ); + + return nOffset; +} + +/************************************************************************/ +/* TIFF_GetSourceSamples() */ +/************************************************************************/ + +static void +TIFF_GetSourceSamples( double * padfSamples, unsigned char *pabySrc, + int nPixelBytes, int nSampleFormat, + int nXSize, int nYSize, + int nPixelOffset, int nLineOffset ) +{ + int iXOff, iYOff, iSample; + + iSample = 0; + + for( iYOff = 0; iYOff < nYSize; iYOff++ ) + { + for( iXOff = 0; iXOff < nXSize; iXOff++ ) + { + unsigned char *pabyData; + + pabyData = pabySrc + iYOff * nLineOffset + iXOff * nPixelOffset; + + if( nSampleFormat == SAMPLEFORMAT_UINT && nPixelBytes == 1 ) + { + padfSamples[iSample++] = *pabyData; + } + else if( nSampleFormat == SAMPLEFORMAT_UINT && nPixelBytes == 2 ) + { + padfSamples[iSample++] = ((uint16 *) pabyData)[0]; + } + else if( nSampleFormat == SAMPLEFORMAT_UINT && nPixelBytes == 4 ) + { + padfSamples[iSample++] = ((uint32 *) pabyData)[0]; + } + else if( nSampleFormat == SAMPLEFORMAT_INT && nPixelBytes == 2 ) + { + padfSamples[iSample++] = ((int16 *) pabyData)[0]; + } + else if( nSampleFormat == SAMPLEFORMAT_INT && nPixelBytes == 32 ) + { + padfSamples[iSample++] = ((int32 *) pabyData)[0]; + } + else if( nSampleFormat == SAMPLEFORMAT_IEEEFP && nPixelBytes == 4 ) + { + padfSamples[iSample++] = ((float *) pabyData)[0]; + } + else if( nSampleFormat == SAMPLEFORMAT_IEEEFP && nPixelBytes == 8 ) + { + padfSamples[iSample++] = ((double *) pabyData)[0]; + } + } + } +} + +/************************************************************************/ +/* TIFF_SetSample() */ +/************************************************************************/ + +static void +TIFF_SetSample( unsigned char * pabyData, int nPixelBytes, int nSampleFormat, + double dfValue ) + +{ + if( nSampleFormat == SAMPLEFORMAT_UINT && nPixelBytes == 1 ) + { + *pabyData = (unsigned char) MAX(0,MIN(255,dfValue)); + } + else if( nSampleFormat == SAMPLEFORMAT_UINT && nPixelBytes == 2 ) + { + *((uint16 *)pabyData) = (uint16) MAX(0,MIN(65535,dfValue)); + } + else if( nSampleFormat == SAMPLEFORMAT_UINT && nPixelBytes == 4 ) + { + *((uint32 *)pabyData) = (uint32) dfValue; + } + else if( nSampleFormat == SAMPLEFORMAT_INT && nPixelBytes == 2 ) + { + *((int16 *)pabyData) = (int16) MAX(-32768,MIN(32767,dfValue)); + } + else if( nSampleFormat == SAMPLEFORMAT_INT && nPixelBytes == 32 ) + { + *((int32 *)pabyData) = (int32) dfValue; + } + else if( nSampleFormat == SAMPLEFORMAT_IEEEFP && nPixelBytes == 4 ) + { + *((float *)pabyData) = (float) dfValue; + } + else if( nSampleFormat == SAMPLEFORMAT_IEEEFP && nPixelBytes == 8 ) + { + *((double *)pabyData) = dfValue; + } +} + +/************************************************************************/ +/* TIFF_DownSample() */ +/* */ +/* Down sample a tile of full res data into a window of a tile */ +/* of downsampled data. */ +/************************************************************************/ + +static +void TIFF_DownSample( unsigned char *pabySrcTile, + int nBlockXSize, int nBlockYSize, + int nPixelSkewBits, int nBitsPerPixel, + unsigned char * pabyOTile, + int nOBlockXSize, int nOBlockYSize, + int nTXOff, int nTYOff, int nOMult, + int nSampleFormat, const char * pszResampling ) + +{ + int i, j, k, nPixelBytes = (nBitsPerPixel) / 8; + int nPixelGroupBytes = (nBitsPerPixel+nPixelSkewBits)/8; + unsigned char *pabySrc, *pabyDst; + double *padfSamples; + + assert( nBitsPerPixel >= 8 ); + + padfSamples = (double *) malloc(sizeof(double) * nOMult * nOMult); + +/* ==================================================================== */ +/* Loop over scanline chunks to process, establishing where the */ +/* data is going. */ +/* ==================================================================== */ + for( j = 0; j*nOMult < nBlockYSize; j++ ) + { + if( j + nTYOff >= nOBlockYSize ) + break; + + pabyDst = pabyOTile + ((j+nTYOff)*nOBlockXSize + nTXOff) + * nPixelBytes * nPixelGroupBytes; + +/* -------------------------------------------------------------------- */ +/* Handler nearest resampling ... we don't even care about the */ +/* data type, we just do a bytewise copy. */ +/* -------------------------------------------------------------------- */ + if( strncmp(pszResampling,"nearest",4) == 0 + || strncmp(pszResampling,"NEAR",4) == 0 ) + { + pabySrc = pabySrcTile + j*nOMult*nBlockXSize * nPixelGroupBytes; + + for( i = 0; i*nOMult < nBlockXSize; i++ ) + { + if( i + nTXOff >= nOBlockXSize ) + break; + + /* + * For now use simple subsampling, from the top left corner + * of the source block of pixels. + */ + + for( k = 0; k < nPixelBytes; k++ ) + pabyDst[k] = pabySrc[k]; + + pabyDst += nPixelBytes * nPixelGroupBytes; + pabySrc += nOMult * nPixelGroupBytes; + } + } + +/* -------------------------------------------------------------------- */ +/* Handle the case of averaging. For this we also have to */ +/* handle each sample format we are concerned with. */ +/* -------------------------------------------------------------------- */ + else if( strncmp(pszResampling,"averag",6) == 0 + || strncmp(pszResampling,"AVERAG",6) == 0 ) + { + pabySrc = pabySrcTile + j*nOMult*nBlockXSize * nPixelGroupBytes; + + for( i = 0; i*nOMult < nBlockXSize; i++ ) + { + double dfTotal; + int iSample; + int nXSize, nYSize; + + if( i + nTXOff >= nOBlockXSize ) + break; + + nXSize = MIN(nOMult,nBlockXSize-i); + nYSize = MIN(nOMult,nBlockYSize-j); + + TIFF_GetSourceSamples( padfSamples, pabySrc, + nPixelBytes, nSampleFormat, + nXSize, nYSize, + nPixelGroupBytes, + nPixelGroupBytes * nBlockXSize ); + + dfTotal = 0; + for( iSample = 0; iSample < nXSize*nYSize; iSample++ ) + { + dfTotal += padfSamples[iSample]; + } + + TIFF_SetSample( pabyDst, nPixelBytes, nSampleFormat, + dfTotal / (nXSize*nYSize) ); + + pabySrc += nOMult * nPixelGroupBytes; + pabyDst += nPixelBytes; + } + } + } + + free( padfSamples ); +} + +/************************************************************************/ +/* TIFF_DownSample_Subsampled() */ +/************************************************************************/ +static +void TIFF_DownSample_Subsampled( unsigned char *pabySrcTile, int nSample, + int nBlockXSize, int nBlockYSize, + unsigned char * pabyOTile, + int nOBlockXSize, int nOBlockYSize, + int nTXOff, int nTYOff, int nOMult, + const char * pszResampling, + int nHorSubsampling, int nVerSubsampling ) +{ + /* TODO: test with variety of subsampling values, and incovinient tile/strip sizes */ + int nSampleBlockSize; + int nSourceSampleRowSize; + int nDestSampleRowSize; + int nSourceX, nSourceY; + int nSourceXSec, nSourceYSec; + int nSourceXSecEnd, nSourceYSecEnd; + int nDestX, nDestY; + int nSampleOffsetInSampleBlock; + unsigned char * pSourceBase; + unsigned char * pDestBase; + int nSourceBaseInc; + unsigned char * pSourceBaseEnd; + unsigned int nCummulator; + unsigned int nCummulatorCount; + + nSampleBlockSize = nHorSubsampling * nVerSubsampling + 2; + nSourceSampleRowSize = + ( ( nBlockXSize + nHorSubsampling - 1 ) / nHorSubsampling ) * nSampleBlockSize; + nDestSampleRowSize = + ( ( nOBlockXSize + nHorSubsampling - 1 ) / nHorSubsampling ) * nSampleBlockSize; + + if( strncmp(pszResampling,"nearest",4) == 0 + || strncmp(pszResampling,"NEAR",4) == 0 ) + { + if( nSample == 0 ) + { + for( nSourceY = 0, nDestY = nTYOff; + nSourceY < nBlockYSize; + nSourceY += nOMult, nDestY ++) + { + if( nDestY >= nOBlockYSize ) + break; + + for( nSourceX = 0, nDestX = nTXOff; + nSourceX < nBlockXSize; + nSourceX += nOMult, nDestX ++) + { + if( nDestX >= nOBlockXSize ) + break; + + * ( pabyOTile + ( nDestY / nVerSubsampling ) * nDestSampleRowSize + + ( nDestY % nVerSubsampling ) * nHorSubsampling + + ( nDestX / nHorSubsampling ) * nSampleBlockSize + + ( nDestX % nHorSubsampling ) ) = + * ( pabySrcTile + ( nSourceY / nVerSubsampling ) * nSourceSampleRowSize + + ( nSourceY % nVerSubsampling ) * nHorSubsampling + + ( nSourceX / nHorSubsampling ) * nSampleBlockSize + + ( nSourceX % nHorSubsampling ) ); + } + } + } + else + { + nSampleOffsetInSampleBlock = nHorSubsampling * nVerSubsampling + nSample - 1; + for( nSourceY = 0, nDestY = ( nTYOff / nVerSubsampling ); + nSourceY < ( nBlockYSize / nVerSubsampling ); + nSourceY += nOMult, nDestY ++) + { + if( nDestY*nVerSubsampling >= nOBlockYSize ) + break; + + for( nSourceX = 0, nDestX = ( nTXOff / nHorSubsampling ); + nSourceX < ( nBlockXSize / nHorSubsampling ); + nSourceX += nOMult, nDestX ++) + { + if( nDestX*nHorSubsampling >= nOBlockXSize ) + break; + + * ( pabyOTile + nDestY * nDestSampleRowSize + + nDestX * nSampleBlockSize + + nSampleOffsetInSampleBlock ) = + * ( pabySrcTile + nSourceY * nSourceSampleRowSize + + nSourceX * nSampleBlockSize + + nSampleOffsetInSampleBlock ); + } + } + } + } + else if( strncmp(pszResampling,"averag",6) == 0 + || strncmp(pszResampling,"AVERAG",6) == 0 ) + { + if( nSample == 0 ) + { + for( nSourceY = 0, nDestY = nTYOff; nSourceY < nBlockYSize; nSourceY += nOMult, nDestY ++) + { + if( nDestY >= nOBlockYSize ) + break; + + for( nSourceX = 0, nDestX = nTXOff; nSourceX < nBlockXSize; nSourceX += nOMult, nDestX ++) + { + if( nDestX >= nOBlockXSize ) + break; + + nSourceXSecEnd = nSourceX + nOMult; + if( nSourceXSecEnd > nBlockXSize ) + nSourceXSecEnd = nBlockXSize; + nSourceYSecEnd = nSourceY + nOMult; + if( nSourceYSecEnd > nBlockYSize ) + nSourceYSecEnd = nBlockYSize; + nCummulator = 0; + for( nSourceYSec = nSourceY; nSourceYSec < nSourceYSecEnd; nSourceYSec ++) + { + for( nSourceXSec = nSourceX; nSourceXSec < nSourceXSecEnd; nSourceXSec ++) + { + nCummulator += * ( pabySrcTile + ( nSourceYSec / nVerSubsampling ) * nSourceSampleRowSize + + ( nSourceYSec % nVerSubsampling ) * nHorSubsampling + + ( nSourceXSec / nHorSubsampling ) * nSampleBlockSize + + ( nSourceXSec % nHorSubsampling ) ); + } + } + nCummulatorCount = ( nSourceXSecEnd - nSourceX ) * ( nSourceYSecEnd - nSourceY ); + * ( pabyOTile + ( nDestY / nVerSubsampling ) * nDestSampleRowSize + + ( nDestY % nVerSubsampling ) * nHorSubsampling + + ( nDestX / nHorSubsampling ) * nSampleBlockSize + + ( nDestX % nHorSubsampling ) ) = + ( ( nCummulator + ( nCummulatorCount >> 1 ) ) / nCummulatorCount ); + } + } + } + else + { + nSampleOffsetInSampleBlock = nHorSubsampling * nVerSubsampling + nSample - 1; + for( nSourceY = 0, nDestY = ( nTYOff / nVerSubsampling ); nSourceY < ( nBlockYSize / nVerSubsampling ); + nSourceY += nOMult, nDestY ++) + { + if( nDestY*nVerSubsampling >= nOBlockYSize ) + break; + + for( nSourceX = 0, nDestX = ( nTXOff / nHorSubsampling ); nSourceX < ( nBlockXSize / nHorSubsampling ); + nSourceX += nOMult, nDestX ++) + { + if( nDestX*nHorSubsampling >= nOBlockXSize ) + break; + + nSourceXSecEnd = nSourceX + nOMult; + if( nSourceXSecEnd > ( nBlockXSize / nHorSubsampling ) ) + nSourceXSecEnd = ( nBlockXSize / nHorSubsampling ); + nSourceYSecEnd = nSourceY + nOMult; + if( nSourceYSecEnd > ( nBlockYSize / nVerSubsampling ) ) + nSourceYSecEnd = ( nBlockYSize / nVerSubsampling ); + nCummulator = 0; + for( nSourceYSec = nSourceY; nSourceYSec < nSourceYSecEnd; nSourceYSec ++) + { + for( nSourceXSec = nSourceX; nSourceXSec < nSourceXSecEnd; nSourceXSec ++) + { + nCummulator += * ( pabySrcTile + nSourceYSec * nSourceSampleRowSize + + nSourceXSec * nSampleBlockSize + + nSampleOffsetInSampleBlock ); + } + } + nCummulatorCount = ( nSourceXSecEnd - nSourceX ) * ( nSourceYSecEnd - nSourceY ); + * ( pabyOTile + nDestY * nDestSampleRowSize + + nDestX * nSampleBlockSize + + nSampleOffsetInSampleBlock ) = + ( ( nCummulator + ( nCummulatorCount >> 1 ) ) / nCummulatorCount ); + } + } + } + } +} + +/************************************************************************/ +/* TIFF_ProcessFullResBlock() */ +/* */ +/* Process one block of full res data, downsampling into each */ +/* of the overviews. */ +/************************************************************************/ + +void TIFF_ProcessFullResBlock( TIFF *hTIFF, int nPlanarConfig, + int bSubsampled, int nHorSubsampling, int nVerSubsampling, + int nOverviews, int * panOvList, + int nBitsPerPixel, + int nSamples, TIFFOvrCache ** papoRawBIs, + int nSXOff, int nSYOff, + unsigned char *pabySrcTile, + int nBlockXSize, int nBlockYSize, + int nSampleFormat, const char * pszResampling ) + +{ + int iOverview, iSample; + + for( iSample = 0; iSample < nSamples; iSample++ ) + { + /* + * We have to read a tile/strip for each sample for + * PLANARCONFIG_SEPARATE. Otherwise, we just read all the samples + * at once when handling the first sample. + */ + if( nPlanarConfig == PLANARCONFIG_SEPARATE || iSample == 0 ) + { + if( TIFFIsTiled(hTIFF) ) + { + TIFFReadEncodedTile( hTIFF, + TIFFComputeTile(hTIFF, nSXOff, nSYOff, + 0, (tsample_t)iSample ), + pabySrcTile, + TIFFTileSize(hTIFF)); + } + else + { + TIFFReadEncodedStrip( hTIFF, + TIFFComputeStrip(hTIFF, nSYOff, + (tsample_t) iSample), + pabySrcTile, + TIFFStripSize(hTIFF) ); + } + } + + /* + * Loop over destination overview layers + */ + for( iOverview = 0; iOverview < nOverviews; iOverview++ ) + { + TIFFOvrCache *poRBI = papoRawBIs[iOverview]; + unsigned char *pabyOTile; + int nTXOff, nTYOff, nOXOff, nOYOff, nOMult; + int nOBlockXSize = poRBI->nBlockXSize; + int nOBlockYSize = poRBI->nBlockYSize; + int nSkewBits, nSampleByteOffset; + + /* + * Fetch the destination overview tile + */ + nOMult = panOvList[iOverview]; + nOXOff = (nSXOff/nOMult) / nOBlockXSize; + nOYOff = (nSYOff/nOMult) / nOBlockYSize; + + if( bSubsampled ) + { + pabyOTile = TIFFGetOvrBlock_Subsampled( poRBI, nOXOff, nOYOff ); + + /* + * Establish the offset into this tile at which we should + * start placing data. + */ + nTXOff = (nSXOff - nOXOff*nOMult*nOBlockXSize) / nOMult; + nTYOff = (nSYOff - nOYOff*nOMult*nOBlockYSize) / nOMult; + + +#ifdef DBMALLOC + malloc_chain_check( 1 ); +#endif + TIFF_DownSample_Subsampled( pabySrcTile, iSample, + nBlockXSize, nBlockYSize, + pabyOTile, + poRBI->nBlockXSize, poRBI->nBlockYSize, + nTXOff, nTYOff, + nOMult, pszResampling, + nHorSubsampling, nVerSubsampling ); +#ifdef DBMALLOC + malloc_chain_check( 1 ); +#endif + + } + else + { + + pabyOTile = TIFFGetOvrBlock( poRBI, nOXOff, nOYOff, iSample ); + + /* + * Establish the offset into this tile at which we should + * start placing data. + */ + nTXOff = (nSXOff - nOXOff*nOMult*nOBlockXSize) / nOMult; + nTYOff = (nSYOff - nOYOff*nOMult*nOBlockYSize) / nOMult; + + /* + * Figure out the skew (extra space between ``our samples'') and + * the byte offset to the first sample. + */ + assert( (nBitsPerPixel % 8) == 0 ); + if( nPlanarConfig == PLANARCONFIG_SEPARATE ) + { + nSkewBits = 0; + nSampleByteOffset = 0; + } + else + { + nSkewBits = nBitsPerPixel * (nSamples-1); + nSampleByteOffset = (nBitsPerPixel/8) * iSample; + } + + /* + * Perform the downsampling. + */ +#ifdef DBMALLOC + malloc_chain_check( 1 ); +#endif + TIFF_DownSample( pabySrcTile + nSampleByteOffset, + nBlockXSize, nBlockYSize, + nSkewBits, nBitsPerPixel, pabyOTile, + poRBI->nBlockXSize, poRBI->nBlockYSize, + nTXOff, nTYOff, + nOMult, nSampleFormat, pszResampling ); +#ifdef DBMALLOC + malloc_chain_check( 1 ); +#endif + } + } + } +} + +/************************************************************************/ +/* TIFF_BuildOverviews() */ +/* */ +/* Build the requested list of overviews. Overviews are */ +/* maintained in a bunch of temporary files and then these are */ +/* written back to the TIFF file. Only one pass through the */ +/* source TIFF file is made for any number of output */ +/* overviews. */ +/************************************************************************/ + +void TIFFBuildOverviews( TIFF *hTIFF, int nOverviews, int * panOvList, + int bUseSubIFDs, const char *pszResampleMethod, + int (*pfnProgress)( double, void * ), + void * pProgressData ) + +{ + TIFFOvrCache **papoRawBIs; + uint32 nXSize, nYSize, nBlockXSize, nBlockYSize; + uint16 nBitsPerPixel, nPhotometric, nCompressFlag, nSamples, + nPlanarConfig, nSampleFormat; + int bSubsampled; + uint16 nHorSubsampling, nVerSubsampling; + int bTiled, nSXOff, nSYOff, i; + unsigned char *pabySrcTile; + uint16 *panRedMap, *panGreenMap, *panBlueMap; + TIFFErrorHandler pfnWarning; + +/* -------------------------------------------------------------------- */ +/* Get the base raster size. */ +/* -------------------------------------------------------------------- */ + TIFFGetField( hTIFF, TIFFTAG_IMAGEWIDTH, &nXSize ); + TIFFGetField( hTIFF, TIFFTAG_IMAGELENGTH, &nYSize ); + + TIFFGetField( hTIFF, TIFFTAG_BITSPERSAMPLE, &nBitsPerPixel ); + /* TODO: nBitsPerPixel seems misnomer and may need renaming to nBitsPerSample */ + TIFFGetField( hTIFF, TIFFTAG_SAMPLESPERPIXEL, &nSamples ); + TIFFGetFieldDefaulted( hTIFF, TIFFTAG_PLANARCONFIG, &nPlanarConfig ); + + TIFFGetFieldDefaulted( hTIFF, TIFFTAG_PHOTOMETRIC, &nPhotometric ); + TIFFGetFieldDefaulted( hTIFF, TIFFTAG_COMPRESSION, &nCompressFlag ); + TIFFGetFieldDefaulted( hTIFF, TIFFTAG_SAMPLEFORMAT, &nSampleFormat ); + + if( nPhotometric == PHOTOMETRIC_YCBCR || nPhotometric == PHOTOMETRIC_ITULAB ) + { + if( nBitsPerPixel != 8 || nSamples != 3 || nPlanarConfig != PLANARCONFIG_CONTIG || + nSampleFormat != SAMPLEFORMAT_UINT) + { + /* TODO: use of TIFFError is inconsistent with use of fprintf in addtiffo.c, sort out */ + TIFFErrorExt( TIFFClientdata(hTIFF), "TIFFBuildOverviews", + "File `%s' has an unsupported subsampling configuration.\n", + TIFFFileName(hTIFF) ); + /* If you need support for this particular flavor, please contact either + * Frank Warmerdam warmerdam@pobox.com + * Joris Van Damme info@awaresystems.be + */ + return; + } + bSubsampled = 1; + TIFFGetField( hTIFF, TIFFTAG_YCBCRSUBSAMPLING, &nHorSubsampling, &nVerSubsampling ); + /* TODO: find out if maybe TIFFGetFieldDefaulted is better choice for YCbCrSubsampling tag */ + } + else + { + if( nBitsPerPixel < 8 ) + { + /* TODO: use of TIFFError is inconsistent with use of fprintf in addtiffo.c, sort out */ + TIFFErrorExt( TIFFClientdata(hTIFF), "TIFFBuildOverviews", + "File `%s' has samples of %d bits per sample. Sample\n" + "sizes of less than 8 bits per sample are not supported.\n", + TIFFFileName(hTIFF), nBitsPerPixel ); + return; + } + bSubsampled = 0; + nHorSubsampling = 1; + nVerSubsampling = 1; + } + +/* -------------------------------------------------------------------- */ +/* Turn off warnings to avoid alot of repeated warnings while */ +/* rereading directories. */ +/* -------------------------------------------------------------------- */ + pfnWarning = TIFFSetWarningHandler( NULL ); + +/* -------------------------------------------------------------------- */ +/* Get the base raster block size. */ +/* -------------------------------------------------------------------- */ + if( TIFFGetField( hTIFF, TIFFTAG_ROWSPERSTRIP, &(nBlockYSize) ) ) + { + nBlockXSize = nXSize; + bTiled = FALSE; + } + else + { + TIFFGetField( hTIFF, TIFFTAG_TILEWIDTH, &nBlockXSize ); + TIFFGetField( hTIFF, TIFFTAG_TILELENGTH, &nBlockYSize ); + bTiled = TRUE; + } + +/* -------------------------------------------------------------------- */ +/* Capture the pallette if there is one. */ +/* -------------------------------------------------------------------- */ + if( TIFFGetField( hTIFF, TIFFTAG_COLORMAP, + &panRedMap, &panGreenMap, &panBlueMap ) ) + { + uint16 *panRed2, *panGreen2, *panBlue2; + int nColorCount = 1 << nBitsPerPixel; + + panRed2 = (uint16 *) _TIFFmalloc(2*nColorCount); + panGreen2 = (uint16 *) _TIFFmalloc(2*nColorCount); + panBlue2 = (uint16 *) _TIFFmalloc(2*nColorCount); + + memcpy( panRed2, panRedMap, 2 * nColorCount ); + memcpy( panGreen2, panGreenMap, 2 * nColorCount ); + memcpy( panBlue2, panBlueMap, 2 * nColorCount ); + + panRedMap = panRed2; + panGreenMap = panGreen2; + panBlueMap = panBlue2; + } + else + { + panRedMap = panGreenMap = panBlueMap = NULL; + } + +/* -------------------------------------------------------------------- */ +/* Initialize overviews. */ +/* -------------------------------------------------------------------- */ + papoRawBIs = (TIFFOvrCache **) _TIFFmalloc(nOverviews*sizeof(void*)); + + for( i = 0; i < nOverviews; i++ ) + { + int nOXSize, nOYSize, nOBlockXSize, nOBlockYSize; + uint32 nDirOffset; + + nOXSize = (nXSize + panOvList[i] - 1) / panOvList[i]; + nOYSize = (nYSize + panOvList[i] - 1) / panOvList[i]; + + nOBlockXSize = MIN((int)nBlockXSize,nOXSize); + nOBlockYSize = MIN((int)nBlockYSize,nOYSize); + + if( bTiled ) + { + if( (nOBlockXSize % 16) != 0 ) + nOBlockXSize = nOBlockXSize + 16 - (nOBlockXSize % 16); + + if( (nOBlockYSize % 16) != 0 ) + nOBlockYSize = nOBlockYSize + 16 - (nOBlockYSize % 16); + } + + nDirOffset = TIFF_WriteOverview( hTIFF, nOXSize, nOYSize, + nBitsPerPixel, nPlanarConfig, + nSamples, nOBlockXSize, nOBlockYSize, + bTiled, nCompressFlag, nPhotometric, + nSampleFormat, + panRedMap, panGreenMap, panBlueMap, + bUseSubIFDs, + nHorSubsampling, nVerSubsampling ); + + papoRawBIs[i] = TIFFCreateOvrCache( hTIFF, nDirOffset ); + } + + if( panRedMap != NULL ) + { + _TIFFfree( panRedMap ); + _TIFFfree( panGreenMap ); + _TIFFfree( panBlueMap ); + } + +/* -------------------------------------------------------------------- */ +/* Allocate a buffer to hold a source block. */ +/* -------------------------------------------------------------------- */ + if( bTiled ) + pabySrcTile = (unsigned char *) _TIFFmalloc(TIFFTileSize(hTIFF)); + else + pabySrcTile = (unsigned char *) _TIFFmalloc(TIFFStripSize(hTIFF)); + +/* -------------------------------------------------------------------- */ +/* Loop over the source raster, applying data to the */ +/* destination raster. */ +/* -------------------------------------------------------------------- */ + for( nSYOff = 0; nSYOff < (int) nYSize; nSYOff += nBlockYSize ) + { + for( nSXOff = 0; nSXOff < (int) nXSize; nSXOff += nBlockXSize ) + { + /* + * Read and resample into the various overview images. + */ + + TIFF_ProcessFullResBlock( hTIFF, nPlanarConfig, + bSubsampled,nHorSubsampling,nVerSubsampling, + nOverviews, panOvList, + nBitsPerPixel, nSamples, papoRawBIs, + nSXOff, nSYOff, pabySrcTile, + nBlockXSize, nBlockYSize, + nSampleFormat, pszResampleMethod ); + } + } + + _TIFFfree( pabySrcTile ); + +/* -------------------------------------------------------------------- */ +/* Cleanup the rawblockedimage files. */ +/* -------------------------------------------------------------------- */ + for( i = 0; i < nOverviews; i++ ) + { + TIFFDestroyOvrCache( papoRawBIs[i] ); + } + + if( papoRawBIs != NULL ) + _TIFFfree( papoRawBIs ); + + TIFFSetWarningHandler( pfnWarning ); +} + + +/* + * Local Variables: + * mode: c + * c-basic-offset: 8 + * fill-column: 78 + * End: + */ |