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C++ GDALColorTable::GetColorEntryAsRGB方法代码示例

本文整理汇总了C++中GDALColorTable::GetColorEntryAsRGB方法的典型用法代码示例。如果您正苦于以下问题:C++ GDALColorTable::GetColorEntryAsRGB方法的具体用法?C++ GDALColorTable::GetColorEntryAsRGB怎么用?C++ GDALColorTable::GetColorEntryAsRGB使用的例子?那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在GDALColorTable的用法示例。


在下文中一共展示了GDALColorTable::GetColorEntryAsRGB方法的9个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的C++代码示例。

示例1: CSLFetchBoolean


//.........这里部分代码省略.........
        return NULL;
    }

/* -------------------------------------------------------------------- */
/*      Prepare colortable.                                             */
/* -------------------------------------------------------------------- */
    GDALRasterBand	*poBand = poSrcDS->GetRasterBand(1);
    ColorMapObject	*psGifCT;
    int			iColor;

    if( poBand->GetColorTable() == NULL )
    {
        psGifCT = GifMakeMapObject( 256, NULL );
        for( iColor = 0; iColor < 256; iColor++ )
        {
            psGifCT->Colors[iColor].Red = (GifByteType) iColor;
            psGifCT->Colors[iColor].Green = (GifByteType) iColor;
            psGifCT->Colors[iColor].Blue = (GifByteType) iColor;
        }
    }
    else
    {
        GDALColorTable	*poCT = poBand->GetColorTable();
        int nFullCount = 1;

        while( nFullCount < poCT->GetColorEntryCount() )
            nFullCount = nFullCount * 2;

        psGifCT = GifMakeMapObject( nFullCount, NULL );
        for( iColor = 0; iColor < poCT->GetColorEntryCount(); iColor++ )
        {
            GDALColorEntry	sEntry;

            poCT->GetColorEntryAsRGB( iColor, &sEntry );
            psGifCT->Colors[iColor].Red = (GifByteType) sEntry.c1;
            psGifCT->Colors[iColor].Green = (GifByteType) sEntry.c2;
            psGifCT->Colors[iColor].Blue = (GifByteType) sEntry.c3;
        }
        for( ; iColor < nFullCount; iColor++ )
        {
            psGifCT->Colors[iColor].Red = 0;
            psGifCT->Colors[iColor].Green = 0;
            psGifCT->Colors[iColor].Blue = 0;
        }
    }

/* -------------------------------------------------------------------- */
/*      Setup parameters.                                               */
/* -------------------------------------------------------------------- */
    if (EGifPutScreenDesc(hGifFile, nXSize, nYSize, 
                          psGifCT->ColorCount, 255, psGifCT) == GIF_ERROR)
    {
        GifFreeMapObject(psGifCT);
        GDALPrintGifError(hGifFile, "Error writing gif file.");
        GIFAbstractDataset::myEGifCloseFile(hGifFile);
        VSIFCloseL( fp );
        return NULL;
    }
    
    GifFreeMapObject(psGifCT);
    psGifCT = NULL;

    /* Support for transparency */
    int bNoDataValue;
    double noDataValue = poBand->GetNoDataValue(&bNoDataValue);
    if (bNoDataValue && noDataValue >= 0 && noDataValue <= 255)
开发者ID:GeospatialDaryl,项目名称:VS2013__00_GDAL_111_x64,代码行数:67,代码来源:gifdataset.cpp

示例2: if


//.........这里部分代码省略.........
                          pszFilename );
            if( fpL != NULL )
                VSIFCloseL(fpL);
            return CE_Failure;
        }
    }

/* -------------------------------------------------------------------- */
/*      Do we have a palette?  If so, create a TIFF compatible version. */
/* -------------------------------------------------------------------- */
    unsigned short      *panRed=NULL, *panGreen=NULL, *panBlue=NULL;

    if( nPhotometric == PHOTOMETRIC_PALETTE )
    {
        GDALColorTable *poCT = papoBandList[0]->GetColorTable();
        int nColorCount;

        if( nBitsPerPixel <= 8 )
            nColorCount = 256;
        else
            nColorCount = 65536;

        panRed   = (unsigned short *) 
            CPLCalloc(nColorCount,sizeof(unsigned short));
        panGreen = (unsigned short *) 
            CPLCalloc(nColorCount,sizeof(unsigned short));
        panBlue  = (unsigned short *) 
            CPLCalloc(nColorCount,sizeof(unsigned short));

        for( int iColor = 0; iColor < nColorCount; iColor++ )
        {
            GDALColorEntry  sRGB;

            if( poCT->GetColorEntryAsRGB( iColor, &sRGB ) )
            {
                panRed[iColor] = (unsigned short) (257 * sRGB.c1);
                panGreen[iColor] = (unsigned short) (257 * sRGB.c2);
                panBlue[iColor] = (unsigned short) (257 * sRGB.c3);
            }
        }
    }

/* -------------------------------------------------------------------- */
/*      Do we need some metadata for the overviews?                     */
/* -------------------------------------------------------------------- */
    CPLString osMetadata;
    GDALDataset *poBaseDS = papoBandList[0]->GetDataset();

    GTIFFBuildOverviewMetadata( pszResampling, poBaseDS, osMetadata );

/* -------------------------------------------------------------------- */
/*      Loop, creating overviews.                                       */
/* -------------------------------------------------------------------- */
    int nOvrBlockXSize, nOvrBlockYSize;
    GTIFFGetOverviewBlockSize(&nOvrBlockXSize, &nOvrBlockYSize);
    for( iOverview = 0; iOverview < nOverviews; iOverview++ )
    {
        int    nOXSize, nOYSize;

        nOXSize = (nXSize + panOverviewList[iOverview] - 1) 
            / panOverviewList[iOverview];
        nOYSize = (nYSize + panOverviewList[iOverview] - 1) 
            / panOverviewList[iOverview];

        GTIFFWriteDirectory(hOTIFF, FILETYPE_REDUCEDIMAGE,
                            nOXSize, nOYSize, nBitsPerPixel, 
开发者ID:AbdelghaniDr,项目名称:mirror,代码行数:67,代码来源:gt_overview.cpp

示例3: loadFile


//.........这里部分代码省略.........
						{
							ccLog::Warning(QString("Failed to instantiate memory for storing color band '%1'!").arg(GDALGetColorInterpretationName(colorInterp)));
						}
						else
						{
							assert(bandType <= GDT_Int32);

							int* colIndexes = (int*) CPLMalloc(sizeof(int)*nXSize);
							//double* scanline = new double[nXSize];
							memset(colIndexes,0,sizeof(int)*nXSize);

							for (int j=0; j<nYSize; ++j)
							{
								if (poBand->RasterIO( GF_Read, /*xOffset=*/0, /*yOffset=*/j, /*xSize=*/nXSize, /*ySize=*/1, /*buffer=*/colIndexes, /*bufferSizeX=*/nXSize, /*bufferSizeY=*/1, /*bufferType=*/GDT_Int32, /*x_offset=*/0, /*y_offset=*/0 ) != CE_None)
								{
									CPLFree(colIndexes);
									delete pc;
									return CC_FERR_READING;
								}

								for (int k=0; k<nXSize; ++k)
								{
									unsigned pointIndex = static_cast<unsigned>(k + j * rasterX);
									if (pointIndex <= pc->size())
									{
										colorType* C = const_cast<colorType*>(pc->getPointColor(pointIndex));

										switch(colorInterp)
										{
										case GCI_PaletteIndex:
											assert(colTable);
											{
												GDALColorEntry col;
												colTable->GetColorEntryAsRGB(colIndexes[k],&col);
												C[0] = static_cast<colorType>(col.c1 & MAX_COLOR_COMP);
												C[1] = static_cast<colorType>(col.c2 & MAX_COLOR_COMP);
												C[2] = static_cast<colorType>(col.c3 & MAX_COLOR_COMP);
											}
											break;

										case GCI_RedBand:
											C[0] = static_cast<colorType>(colIndexes[k] & MAX_COLOR_COMP);
											break;
										case GCI_GreenBand:
											C[1] = static_cast<colorType>(colIndexes[k] & MAX_COLOR_COMP);
											break;
										case GCI_BlueBand:
											C[2] = static_cast<colorType>(colIndexes[k] & MAX_COLOR_COMP);
											break;

										default:
											assert(false);
											break;
										}
									}
								}
							}

							if (colIndexes)
								CPLFree(colIndexes);
							colIndexes = 0;

							pc->showColors(true);
						}
					}
				}
开发者ID:abp250,项目名称:trunk,代码行数:67,代码来源:RasterGridFilter.cpp

示例4: if

static GDALDataset *
BSBCreateCopy( const char * pszFilename, GDALDataset *poSrcDS, 
               int bStrict, char ** papszOptions, 
               GDALProgressFunc pfnProgress, void * pProgressData )

{
    int  nBands = poSrcDS->GetRasterCount();
    int  nXSize = poSrcDS->GetRasterXSize();
    int  nYSize = poSrcDS->GetRasterYSize();

/* -------------------------------------------------------------------- */
/*      Some some rudimentary checks                                    */
/* -------------------------------------------------------------------- */
    if( nBands != 1 )
    {
        CPLError( CE_Failure, CPLE_NotSupported, 
                  "BSB driver only supports one band images.\n" );

        return NULL;
    }

    if( poSrcDS->GetRasterBand(1)->GetRasterDataType() != GDT_Byte 
        && bStrict )
    {
        CPLError( CE_Failure, CPLE_NotSupported, 
                  "BSB driver doesn't support data type %s. "
                  "Only eight bit bands supported.\n", 
                  GDALGetDataTypeName( 
                      poSrcDS->GetRasterBand(1)->GetRasterDataType()) );

        return NULL;
    }

/* -------------------------------------------------------------------- */
/*      Open the output file.                                           */
/* -------------------------------------------------------------------- */
    BSBInfo *psBSB;

    psBSB = BSBCreate( pszFilename, 0, 200, nXSize, nYSize );
    if( psBSB == NULL )
        return NULL;

/* -------------------------------------------------------------------- */
/*      Prepare initial color table.colortable.                         */
/* -------------------------------------------------------------------- */
    GDALRasterBand	*poBand = poSrcDS->GetRasterBand(1);
    int			iColor;
    unsigned char       abyPCT[771];
    int                 nPCTSize;
    int                 anRemap[256];

    abyPCT[0] = 0;
    abyPCT[1] = 0;
    abyPCT[2] = 0;

    if( poBand->GetColorTable() == NULL )
    {
        /* map greyscale down to 63 grey levels. */
        for( iColor = 0; iColor < 256; iColor++ )
        {
            int nOutValue = (int) (iColor / 4.1) + 1;

            anRemap[iColor] = nOutValue;
            abyPCT[nOutValue*3 + 0] = (unsigned char) iColor;
            abyPCT[nOutValue*3 + 1] = (unsigned char) iColor;
            abyPCT[nOutValue*3 + 2] = (unsigned char) iColor;
        }
        nPCTSize = 64;
    }
    else
    {
        GDALColorTable	*poCT = poBand->GetColorTable();
        int nColorTableSize = poCT->GetColorEntryCount();
        if (nColorTableSize > 255)
            nColorTableSize = 255;

        for( iColor = 0; iColor < nColorTableSize; iColor++ )
        {
            GDALColorEntry	sEntry;

            poCT->GetColorEntryAsRGB( iColor, &sEntry );

            anRemap[iColor] = iColor + 1;
            abyPCT[(iColor+1)*3 + 0] = (unsigned char) sEntry.c1;
            abyPCT[(iColor+1)*3 + 1] = (unsigned char) sEntry.c2;
            abyPCT[(iColor+1)*3 + 2] = (unsigned char) sEntry.c3;
        }

        nPCTSize = nColorTableSize + 1;

        // Add entries for pixel values which apparently will not occur.
        for( iColor = nPCTSize; iColor < 256; iColor++ )
            anRemap[iColor] = 1;
    }

/* -------------------------------------------------------------------- */
/*      Boil out all duplicate entries.                                 */
/* -------------------------------------------------------------------- */
    int  i;

//.........这里部分代码省略.........
开发者ID:samalone,项目名称:gdal-ios,代码行数:101,代码来源:bsbdataset.cpp

示例5: ReadBlockFromFile

CPLErr GDALWMSRasterBand::ReadBlockFromFile(int x, int y, const char *file_name, int to_buffer_band, void *buffer, int advise_read) {
    CPLErr ret = CE_None;
    GDALDataset *ds = 0;
    GByte *color_table = NULL;
    int i;

    //CPLDebug("WMS", "ReadBlockFromFile: to_buffer_band=%d, (x,y)=(%d, %d)", to_buffer_band, x, y);

    /* expected size */
    const int esx = MIN(MAX(0, (x + 1) * nBlockXSize), nRasterXSize) - MIN(MAX(0, x * nBlockXSize), nRasterXSize);
    const int esy = MIN(MAX(0, (y + 1) * nBlockYSize), nRasterYSize) - MIN(MAX(0, y * nBlockYSize), nRasterYSize);
    ds = reinterpret_cast<GDALDataset*>(GDALOpen(file_name, GA_ReadOnly));
    if (ds != NULL) {
        int sx = ds->GetRasterXSize();
        int sy = ds->GetRasterYSize();
        bool accepted_as_no_alpha = false;  // if the request is for 4 bands but the wms returns 3  
        /* Allow bigger than expected so pre-tiled constant size images work on corners */
        if ((sx > nBlockXSize) || (sy > nBlockYSize) || (sx < esx) || (sy < esy)) {
            CPLError(CE_Failure, CPLE_AppDefined, "GDALWMS: Incorrect size %d x %d of downloaded block, expected %d x %d, max %d x %d.",
                sx, sy, esx, esy, nBlockXSize, nBlockYSize);
            ret = CE_Failure;
        }
        if (ret == CE_None) {
            int nDSRasterCount = ds->GetRasterCount();
            if (nDSRasterCount != m_parent_dataset->nBands) {
                /* Maybe its an image with color table */
                bool accepted_as_ct = false;
                if ((eDataType == GDT_Byte) && (ds->GetRasterCount() == 1)) {
                    GDALRasterBand *rb = ds->GetRasterBand(1);
                    if (rb->GetRasterDataType() == GDT_Byte) {
                        GDALColorTable *ct = rb->GetColorTable();
                        if (ct != NULL) {
                            accepted_as_ct = true;
                            if (!advise_read) {
                                color_table = new GByte[256 * 4];
                                const int count = MIN(256, ct->GetColorEntryCount());
                                for (i = 0; i < count; ++i) {
                                    GDALColorEntry ce;
                                    ct->GetColorEntryAsRGB(i, &ce);
                                    color_table[i] = static_cast<GByte>(ce.c1);
                                    color_table[i + 256] = static_cast<GByte>(ce.c2);
                                    color_table[i + 512] = static_cast<GByte>(ce.c3);
                                    color_table[i + 768] = static_cast<GByte>(ce.c4);
                                }
                                for (i = count; i < 256; ++i) {
                                    color_table[i] = 0;
                                    color_table[i + 256] = 0;
                                    color_table[i + 512] = 0;
                                    color_table[i + 768] = 0;
                                }
                            }
                        }
                    }
                }

                if (nDSRasterCount == 4 && m_parent_dataset->nBands == 3)
                {
                    /* metacarta TMS service sometimes return a 4 band PNG instead of the expected 3 band... */
                }
                else if (!accepted_as_ct) {
                   if (ds->GetRasterCount()==3 && m_parent_dataset->nBands == 4 && (eDataType == GDT_Byte))
                   { // WMS returned a file with no alpha so we will fill the alpha band with "opaque" 
                      accepted_as_no_alpha = true;
                   }
                   else
                   {
                      CPLError(CE_Failure, CPLE_AppDefined, "GDALWMS: Incorrect bands count %d in downloaded block, expected %d.",
                         nDSRasterCount, m_parent_dataset->nBands);
                      ret = CE_Failure;
                   }
                }
            }
        }
        if (!advise_read) {
            for (int ib = 1; ib <= m_parent_dataset->nBands; ++ib) {
                if (ret == CE_None) {
                    void *p = NULL;
                    GDALRasterBlock *b = NULL;
                    if ((buffer != NULL) && (ib == to_buffer_band)) {
                        p = buffer;
                    } else {
                        GDALWMSRasterBand *band = static_cast<GDALWMSRasterBand *>(m_parent_dataset->GetRasterBand(ib));
                        if (m_overview >= 0) band = static_cast<GDALWMSRasterBand *>(band->GetOverview(m_overview));
                        if (!band->IsBlockInCache(x, y)) {
                            b = band->GetLockedBlockRef(x, y, true);
                            if (b != NULL) {
                                p = b->GetDataRef();
                                if (p == NULL) {
                                  CPLError(CE_Failure, CPLE_AppDefined, "GDALWMS: GetDataRef returned NULL.");
                                  ret = CE_Failure;
                                }
                            }
                        }
                        else
                        {
                            //CPLDebug("WMS", "Band %d, block (x,y)=(%d, %d) already in cache", band->GetBand(), x, y);
                        }
                    }
                    if (p != NULL) {
                        int pixel_space = GDALGetDataTypeSize(eDataType) / 8;
//.........这里部分代码省略.........
开发者ID:469447793,项目名称:World-Wind-Java,代码行数:101,代码来源:rasterband.cpp

示例6: if


//.........这里部分代码省略.........
                          "failed in XTIFFOpen().\n",
                          pszFilename );

            return CE_Failure;
        }
    }

/* -------------------------------------------------------------------- */
/*      Do we have a palette?  If so, create a TIFF compatible version. */
/* -------------------------------------------------------------------- */
    unsigned short      *panRed=NULL, *panGreen=NULL, *panBlue=NULL;

    if( nPhotometric == PHOTOMETRIC_PALETTE )
    {
        GDALColorTable *poCT = papoBandList[0]->GetColorTable();
        int nColorCount;

        if( nBitsPerPixel <= 8 )
            nColorCount = 256;
        else
            nColorCount = 65536;

        panRed   = (unsigned short *) 
            CPLCalloc(nColorCount,sizeof(unsigned short));
        panGreen = (unsigned short *) 
            CPLCalloc(nColorCount,sizeof(unsigned short));
        panBlue  = (unsigned short *) 
            CPLCalloc(nColorCount,sizeof(unsigned short));

        for( int iColor = 0; iColor < nColorCount; iColor++ )
        {
            GDALColorEntry  sRGB;

            if( poCT->GetColorEntryAsRGB( iColor, &sRGB ) )
            {
                panRed[iColor] = (unsigned short) (257 * sRGB.c1);
                panGreen[iColor] = (unsigned short) (257 * sRGB.c2);
                panBlue[iColor] = (unsigned short) (257 * sRGB.c3);
            }
        }
    }

/* -------------------------------------------------------------------- */
/*      Do we need some metadata for the overviews?                     */
/* -------------------------------------------------------------------- */
    CPLString osMetadata;
    GDALDataset *poBaseDS = papoBandList[0]->GetDataset();

    GTIFFBuildOverviewMetadata( pszResampling, poBaseDS, osMetadata );

/* -------------------------------------------------------------------- */
/*      Loop, creating overviews.                                       */
/* -------------------------------------------------------------------- */
    for( iOverview = 0; iOverview < nOverviews; iOverview++ )
    {
        int    nOXSize, nOYSize;
        uint32 nDirOffset;

        nOXSize = (nXSize + panOverviewList[iOverview] - 1) 
            / panOverviewList[iOverview];
        nOYSize = (nYSize + panOverviewList[iOverview] - 1) 
            / panOverviewList[iOverview];

        nDirOffset = 
            GTIFFWriteDirectory(hOTIFF, FILETYPE_REDUCEDIMAGE,
                                nOXSize, nOYSize, nBitsPerPixel, 
开发者ID:AbdelghaniDr,项目名称:mirror,代码行数:67,代码来源:gt_overview.cpp

示例7: if

static GDALDataset *
XPMCreateCopy( const char * pszFilename, GDALDataset *poSrcDS, 
               int bStrict, char ** papszOptions, 
               GDALProgressFunc pfnProgress, void * pProgressData )

{
    int  nBands = poSrcDS->GetRasterCount();
    int  nXSize = poSrcDS->GetRasterXSize();
    int  nYSize = poSrcDS->GetRasterYSize();
    GDALColorTable *poCT;

/* -------------------------------------------------------------------- */
/*      Some some rudimentary checks                                    */
/* -------------------------------------------------------------------- */
    if( nBands != 1 )
    {
        CPLError( CE_Failure, CPLE_NotSupported, 
                  "XPM driver only supports one band images.\n" );

        return NULL;
    }

    if( poSrcDS->GetRasterBand(1)->GetRasterDataType() != GDT_Byte 
        && bStrict )
    {
        CPLError( CE_Failure, CPLE_NotSupported, 
                  "XPM driver doesn't support data type %s. "
                  "Only eight bit bands supported.\n", 
                  GDALGetDataTypeName( 
                      poSrcDS->GetRasterBand(1)->GetRasterDataType()) );

        return NULL;
    }

/* -------------------------------------------------------------------- */
/*      If there is no colortable on the source image, create a         */
/*      greyscale one with 64 levels of grey.                           */
/* -------------------------------------------------------------------- */
    GDALRasterBand	*poBand = poSrcDS->GetRasterBand(1);
    int                 i;
    GDALColorTable      oGreyTable;

    poCT = poBand->GetColorTable();
    if( poCT == NULL )
    {
        poCT = &oGreyTable;

        for( i = 0; i < 256; i++ )
        {
            GDALColorEntry sColor;

            sColor.c1 = (short) i;
            sColor.c2 = (short) i;
            sColor.c3 = (short) i;
            sColor.c4 = 255;

            poCT->SetColorEntry( i, &sColor );
        }
    }

/* -------------------------------------------------------------------- */
/*      Build list of active colors, and the mapping from pixels to     */
/*      our active colormap.                                            */
/* -------------------------------------------------------------------- */
    const char *pszColorCodes = " [email protected]#$%^&*()-+=[]|:;,.<>?/";

    int  anPixelMapping[256];
    GDALColorEntry asPixelColor[256];
    int  nActiveColors = MIN(poCT->GetColorEntryCount(),256);

    // Setup initial colortable and pixel value mapping. 
    memset( anPixelMapping+0, 0, sizeof(int) * 256 );
    for( i = 0; i < nActiveColors; i++ )
    {
        poCT->GetColorEntryAsRGB( i, asPixelColor + i );
        anPixelMapping[i] = i;
    }

/* ==================================================================== */
/*      Iterate merging colors until we are under our limit (about 85). */
/* ==================================================================== */
    while( nActiveColors > (int) strlen(pszColorCodes) )
    {
        int nClosestDistance = 768;
        int iClose1 = -1, iClose2 = -1;
        int iColor1, iColor2;

        // Find the closest pair of colors. 
        for( iColor1 = 0; iColor1 < nActiveColors; iColor1++ )
        {
            for( iColor2 = iColor1+1; iColor2 < nActiveColors; iColor2++ )
            {
                int	nDistance;

                if( asPixelColor[iColor1].c4 < 128 
                    && asPixelColor[iColor2].c4 < 128 )
                    nDistance = 0;
                else
                    nDistance = 
                        ABS(asPixelColor[iColor1].c1-asPixelColor[iColor2].c1)
//.........这里部分代码省略.........
开发者ID:469447793,项目名称:World-Wind-Java,代码行数:101,代码来源:xpmdataset.cpp

示例8: if


//.........这里部分代码省略.........
                          pszFilename );
            if( fpL != nullptr )
                CPL_IGNORE_RET_VAL(VSIFCloseL(fpL));
            return CE_Failure;
        }
    }

/* -------------------------------------------------------------------- */
/*      Do we have a palette?  If so, create a TIFF compatible version. */
/* -------------------------------------------------------------------- */
    unsigned short *panRed = nullptr;
    unsigned short *panGreen = nullptr;
    unsigned short *panBlue = nullptr;

    if( nPhotometric == PHOTOMETRIC_PALETTE )
    {
        GDALColorTable *poCT = papoBandList[0]->GetColorTable();
        int nColorCount = 65536;

        if( nBitsPerPixel <= 8 )
            nColorCount = 256;

        panRed = static_cast<unsigned short *>(
            CPLCalloc(nColorCount, sizeof(unsigned short)) );
        panGreen = static_cast<unsigned short *>(
            CPLCalloc(nColorCount, sizeof(unsigned short)) );
        panBlue = static_cast<unsigned short *>(
            CPLCalloc(nColorCount, sizeof(unsigned short)) );

        for( int iColor = 0; iColor < nColorCount; iColor++ )
        {
          GDALColorEntry sRGB = { 0, 0, 0, 0 };

            if( poCT->GetColorEntryAsRGB( iColor, &sRGB ) )
            {
                // TODO(schwehr): Check for underflow.
                // Going from signed short to unsigned short.
                panRed[iColor] = static_cast<unsigned short>(257 * sRGB.c1);
                panGreen[iColor] = static_cast<unsigned short>(257 * sRGB.c2);
                panBlue[iColor] = static_cast<unsigned short>(257 * sRGB.c3);
            }
        }
    }

/* -------------------------------------------------------------------- */
/*      Do we need some metadata for the overviews?                     */
/* -------------------------------------------------------------------- */
    CPLString osMetadata;
    GDALDataset *poBaseDS = papoBandList[0]->GetDataset();

    GTIFFBuildOverviewMetadata( pszResampling, poBaseDS, osMetadata );

/* -------------------------------------------------------------------- */
/*      Loop, creating overviews.                                       */
/* -------------------------------------------------------------------- */
    int nOvrBlockXSize = 0;
    int nOvrBlockYSize = 0;
    GTIFFGetOverviewBlockSize(&nOvrBlockXSize, &nOvrBlockYSize);

    CPLString osNoData; // don't move this in inner scope
    const char* pszNoData = nullptr;
    int bNoDataSet = FALSE;
    const double dfNoDataValue = papoBandList[0]->GetNoDataValue(&bNoDataSet);
    if( bNoDataSet )
    {
        osNoData = GTiffFormatGDALNoDataTagValue(dfNoDataValue);
开发者ID:AsgerPetersen,项目名称:gdal,代码行数:67,代码来源:gt_overview.cpp

示例9: ReadTIF


//.........这里部分代码省略.........
		{
			GDALColorEntry Ent;
			for (iyBlock = 0; iyBlock < nyBlocks; iyBlock++)
			{
				if (progress_callback != NULL)
					progress_callback(iyBlock * 100 / nyBlocks);

				y = iyBlock * yBlockSize;
				for (ixBlock = 0; ixBlock < nxBlocks; ixBlock++)
				{
					x = ixBlock * xBlockSize;
					Err = pBand->ReadBlock(ixBlock, iyBlock, pScanline);
					if (Err != CE_None)
						throw "Problem reading the image data.";

					// Compute the portion of the block that is valid
					// for partial edge blocks.
					if ((ixBlock+1) * xBlockSize > iXSize)
						nxValid = iXSize - ixBlock * xBlockSize;
					else
						nxValid = xBlockSize;

					if( (iyBlock+1) * yBlockSize > iYSize)
						nyValid = iYSize - iyBlock * yBlockSize;
					else
						nyValid = yBlockSize;

					for( iY = 0; iY < nyValid; iY++ )
					{
						for( iX = 0; iX < nxValid; iX++ )
						{
							if (bColorPalette)
							{
								pTable->GetColorEntryAsRGB(pScanline[iY * xBlockSize + iX], &Ent);
								rgb.r = (uchar) Ent.c1;
								rgb.g = (uchar) Ent.c2;
								rgb.b = (uchar) Ent.c3;
								SetPixel24(x + iX, y + iY, rgb);
							}
							else
								SetPixel8(x + iX, y + iY, pScanline[iY * xBlockSize + iX]);
						}
					}
				}
			}
		}
		if (iRasterCount >= 3)
		{
			for (iyBlock = 0; iyBlock < nyBlocks; iyBlock++)
			{
				if (progress_callback != NULL)
					progress_callback(iyBlock * 100 / nyBlocks);

				y = iyBlock * yBlockSize;
				for (ixBlock = 0; ixBlock < nxBlocks; ixBlock++)
				{
					x = ixBlock * xBlockSize;
					Err = pRed->ReadBlock(ixBlock, iyBlock, pRedline);
					if (Err != CE_None)
						throw "Cannot read data.";
					Err = pGreen->ReadBlock(ixBlock, iyBlock, pGreenline);
					if (Err != CE_None)
						throw "Cannot read data.";
					Err = pBlue->ReadBlock(ixBlock, iyBlock, pBlueline);
					if (Err != CE_None)
						throw "Cannot read data.";
开发者ID:kalwalt,项目名称:ofxVTerrain,代码行数:67,代码来源:ImageOSG.cpp


注:本文中的GDALColorTable::GetColorEntryAsRGB方法示例由纯净天空整理自Github/MSDocs等开源代码及文档管理平台,相关代码片段筛选自各路编程大神贡献的开源项目,源码版权归原作者所有,传播和使用请参考对应项目的License;未经允许,请勿转载。