readerwritertiff.cpp

最新osg包

    uint32 row;
    int format;
    unsigned char *buffer;
    int width;
    int height;
    unsigned char *currPtr;

    TIFFSetErrorHandler(tiff_error);
    TIFFSetWarningHandler(tiff_warn);

    in = TIFFClientOpen("inputstream", "r", (thandle_t)&fin,
            libtiffStreamReadProc, //Custom read function
            libtiffStreamWriteProc, //Custom write function
            libtiffStreamSeekProc, //Custom seek function
            libtiffStreamCloseProc, //Custom close function
            libtiffStreamSizeProc, //Custom size function
            libtiffStreamMapProc, //Custom map function
            libtiffStreamUnmapProc); //Custom unmap function

    if (in == NULL)
    {
        tifferror = ERR_OPEN;
        return NULL;
    }
    if (TIFFGetField(in, TIFFTAG_PHOTOMETRIC, &photometric) == 1)
    {
        if (photometric != PHOTOMETRIC_RGB && photometric != PHOTOMETRIC_PALETTE &&
            photometric != PHOTOMETRIC_MINISWHITE &&
            photometric != PHOTOMETRIC_MINISBLACK)
        {
            osg::notify(osg::NOTICE) << "Photometric type "<<photometric<<" not handled; can only handle Grayscale, RGB and Palette images" << std::endl;
            TIFFClose(in);
            tifferror = ERR_UNSUPPORTED;
            return NULL;
        }
    }
    else
    {
        tifferror = ERR_READ;
        TIFFClose(in);
        return NULL;
    }

    if (TIFFGetField(in, TIFFTAG_SAMPLESPERPIXEL, &samplesperpixel) == 1)
    {
        if (samplesperpixel != 1 &&
            samplesperpixel != 2 &&
            samplesperpixel != 3 &&
            samplesperpixel != 4)
        {
            osg::notify(osg::DEBUG_INFO) << "Bad samples/pixel" << std::endl;
            tifferror = ERR_UNSUPPORTED;
            TIFFClose(in);
            return NULL;
        }
    }
    else
    {
        tifferror = ERR_READ;
        TIFFClose(in);
        return NULL;
    }

    if (TIFFGetField(in, TIFFTAG_BITSPERSAMPLE, &bitspersample) == 1)
    {
         if (bitspersample != 8 && bitspersample != 16 && bitspersample != 32)
        {
            osg::notify(osg::NOTICE) << "can only handle 8, 16 and 32 bit samples" << std::endl;
            TIFFClose(in);
            tifferror = ERR_UNSUPPORTED;
            return NULL;
        }
    }
    else
    {
        tifferror = ERR_READ;
        TIFFClose(in);
        return NULL;
    }
    
    if (TIFFGetField(in, TIFFTAG_IMAGEWIDTH, &w) != 1 ||
        TIFFGetField(in, TIFFTAG_IMAGELENGTH, &h) != 1 ||
        TIFFGetField(in, TIFFTAG_PLANARCONFIG, &config) != 1)
    {
        TIFFClose(in);
        tifferror = ERR_READ;
        return NULL;
    }

        
    TIFFGetField(in, TIFFTAG_DATATYPE, &dataType);
    osg::notify(osg::INFO)<<"TIFFTAG_DATATYPE="<<dataType<<std::endl;


    /*
    if (photometric == PHOTOMETRIC_MINISWHITE ||
        photometric == PHOTOMETRIC_MINISBLACK)
        format = 1;
    else
        format = 3;
    */
    // if it has a palette, data returned is 3 byte rgb
    // so set format to 3.
    if (photometric == PHOTOMETRIC_PALETTE)
        format = 3; 
    else
        format = samplesperpixel * bitspersample / 8;
    
    
    int bytespersample = bitspersample / 8;
    int bytesperpixel = bytespersample * samplesperpixel;
    
    osg::notify(osg::INFO)<<"format="<<format<<std::endl;
    osg::notify(osg::INFO)<<"bytespersample="<<bytespersample<<std::endl;
    osg::notify(osg::INFO)<<"bytesperpixel="<<bytesperpixel<<std::endl;
    
    buffer = new unsigned char [w*h*format];

    if (!buffer)
    {
        tifferror = ERR_MEM;
        TIFFClose(in);
        return NULL;
    }

    // initialize memory
    for(unsigned char* ptr=buffer;ptr<buffer+w*h*format;++ptr) *ptr = 0;

    width = w;
    height = h;

    currPtr = buffer + (h-1)*w*format;

    tifferror = ERR_NO_ERROR;

    switch (pack(photometric, config))
    {
        case pack(PHOTOMETRIC_MINISWHITE, PLANARCONFIG_CONTIG):
        case pack(PHOTOMETRIC_MINISBLACK, PLANARCONFIG_CONTIG):
        case pack(PHOTOMETRIC_MINISWHITE, PLANARCONFIG_SEPARATE):
        case pack(PHOTOMETRIC_MINISBLACK, PLANARCONFIG_SEPARATE):
            inbuf = new unsigned char [TIFFScanlineSize(in)];
            for (row = 0; row < h; row++)
            {
                if (TIFFReadScanline(in, inbuf, row, 0) < 0)
                {
                    tifferror = ERR_READ;
                    break;
                }
                invert_row(currPtr, inbuf, w, photometric == PHOTOMETRIC_MINISWHITE, bitspersample);
                currPtr -= format*w;
            }
            break;

        case pack(PHOTOMETRIC_PALETTE, PLANARCONFIG_CONTIG):
        case pack(PHOTOMETRIC_PALETTE, PLANARCONFIG_SEPARATE):
            if (TIFFGetField(in, TIFFTAG_COLORMAP, &red, &green, &blue) != 1)
                tifferror = ERR_READ;
            /* */
            /* Convert 16-bit colormap to 8-bit (unless it looks */
            /* like an old-style 8-bit colormap). */
            /* */
            if (!tifferror && checkcmap(1<<bitspersample, red, green, blue) == 16)
            {
                int i;
                for (i = (1<<bitspersample)-1; i >= 0; i--)
                {
                    red[i] = CVT(red[i]);
                    green[i] = CVT(green[i]);
                    blue[i] = CVT(blue[i]);
                }
            }

            inbuf = new unsigned char [TIFFScanlineSize(in)];
            for (row = 0; row < h; row++)
            {
                if (TIFFReadScanline(in, inbuf, row, 0) < 0)
                {
                    tifferror = ERR_READ;
                    break;
                }
                remap_row(currPtr, inbuf, w, red, green, blue);
                currPtr -= format*w;
            }
            break;

        case pack(PHOTOMETRIC_RGB, PLANARCONFIG_CONTIG):
            inbuf = new unsigned char [TIFFScanlineSize(in)];
            for (row = 0; row < h; row++)
            {
                if (TIFFReadScanline(in, inbuf, row, 0) < 0)
                {
                    tifferror = ERR_READ;
                    break;
                }
                memcpy(currPtr, inbuf, format*w);
                currPtr -= format*w;
            }
            break;

        case pack(PHOTOMETRIC_RGB, PLANARCONFIG_SEPARATE):
            rowsize = TIFFScanlineSize(in);
            inbuf = new unsigned char [format*rowsize];
            for (row = 0; !tifferror && row < h; row++)
            {
                int s;
                for (s = 0; s < format; s++)
                {
                    if (TIFFReadScanline(in, (tdata_t)(inbuf+s*rowsize), (uint32)row, (tsample_t)s) < 0)
                    {
                        tifferror = ERR_READ; break;
                    }
                }
                if (!tifferror)
                {
                    if (format==3) interleave_row(currPtr, inbuf, inbuf+rowsize, inbuf+2*rowsize, w, format, bitspersample);
                    else if (format==4) interleave_row(currPtr, inbuf, inbuf+rowsize, inbuf+2*rowsize, inbuf+3*rowsize, w, format, bitspersample);
                    currPtr -= format*w;
                }
            }
            break;
        default:
            tifferror = ERR_UNSUPPORTED;
            break;
    }

    if (inbuf) delete [] inbuf;
    TIFFClose(in);

    if (tifferror)
    {
        if (buffer) delete [] buffer;
        return NULL;
    }
    width_ret = width;
    height_ret = height;
    if (photometric == PHOTOMETRIC_PALETTE)
        numComponents_ret = format;
    else
        numComponents_ret = samplesperpixel;

    return buffer;
}


#undef CVT
#undef pack

class ReaderWriterTIFF : public osgDB::ReaderWriter
{
    public:
    
        ReaderWriterTIFF()
        {
            supportsExtension("tiff","Tiff image format");
            supportsExtension("tif","Tiff image format");
        }
        
        virtual const char* className() const { return "TIFF Image Reader"; }
        virtual bool acceptsExtension(const std::string& extension) const
        { 
            if( osgDB::equalCaseInsensitive(extension,"tiff")) return true;
            if( osgDB::equalCaseInsensitive(extension,"tif") ) return true;
            return false;
        }

        ReadResult readTIFStream(std::istream& fin) const
        {
            unsigned char *imageData = NULL;
            int width_ret = -1;
            int height_ret = -1;
            int numComponents_ret = -1;
            uint16 bitspersample_ret = 0;

            imageData = simage_tiff_load(fin, width_ret, height_ret, numComponents_ret, bitspersample_ret);

            if (imageData==NULL) 
            {
                char err_msg[256];
                simage_tiff_error( err_msg, sizeof(err_msg)); 
                osg::notify(osg::WARN) << err_msg << std::endl;
                return ReadResult::FILE_NOT_HANDLED;
            }

            int s = width_ret;
            int t = height_ret;
            int r = 1;

            int internalFormat = numComponents_ret;

            unsigned int pixelFormat =
                numComponents_ret == 1 ? GL_LUMINANCE :
                numComponents_ret == 2 ? GL_LUMINANCE_ALPHA :
                numComponents_ret == 3 ? GL_RGB :
                numComponents_ret == 4 ? GL_RGBA : (GLenum)-1;


            unsigned int dataType = 
                bitspersample_ret == 8 ? GL_UNSIGNED_BYTE : 
                bitspersample_ret == 16 ? GL_UNSIGNED_SHORT :
                bitspersample_ret == 32 ? GL_FLOAT : (GLenum)-1;

            osg::Image* pOsgImage = new osg::Image;
            pOsgImage->setImage(s,t,r,
                internalFormat,
                pixelFormat,
                dataType,
                imageData,
                osg::Image::USE_NEW_DELETE);

            return pOsgImage;
        }

        WriteResult::WriteStatus writeTIFStream(std::ostream& fout, const osg::Image& img) const
        {
            //Code is based from the following article on CodeProject.com
            //http://www.codeproject.com/bitmap/BitmapsToTiffs.asp

            TIFF *image;
            int samplesPerPixel;
            int bitsPerSample;
            uint16 photometric;

            image = TIFFClientOpen("outputstream", "w", (thandle_t)&fout,
                                    libtiffOStreamReadProc, //Custom read function
                                    libtiffOStreamWriteProc, //Custom write function
                                    libtiffOStreamSeekProc, //Custom seek function
                                    libtiffStreamCloseProc, //Custom close function
                                    libtiffOStreamSizeProc, //Custom size function
                                    libtiffStreamMapProc, //Custom map function
                                    libtiffStreamUnmapProc); //Custom unmap function
            
            if(image == NULL)
            {
                return WriteResult::ERROR_IN_WRITING_FILE;
            }

            switch(img.getPixelFormat()) {
                case GL_LUMINANCE:
                case GL_ALPHA:
                    photometric = PHOTOMETRIC_MINISBLACK;
                    samplesPerPixel = 1;
                    break;
                case GL_LUMINANCE_ALPHA:
                    photometric = PHOTOMETRIC_MINISBLACK;
                    samplesPerPixel = 2;
                    break;
                case GL_RGB:
                    photometric = PHOTOMETRIC_RGB;
                    samplesPerPixel = 3;
                    break;
                case GL_RGBA:
                    photometric = PHOTOMETRIC_RGB;
                    samplesPerPixel = 4;
                    break;
                default:
                    return WriteResult::ERROR_IN_WRITING_FILE;
                    break;
            }

            switch(img.getDataType()){
                case GL_FLOAT:
                    TIFFSetField(image, TIFFTAG_SAMPLEFORMAT, SAMPLEFORMAT_IEEEFP);
                    TIFFSetField(image, TIFFTAG_ROWSPERSTRIP, 1);
                    bitsPerSample = 32;
                    break;
                default:
                    bitsPerSample = 8;
                    break;
            }

            TIFFSetField(image, TIFFTAG_IMAGEWIDTH,img.s());
            TIFFSetField(image, TIFFTAG_IMAGELENGTH,img.t());
            TIFFSetField(image, TIFFTAG_BITSPERSAMPLE,bitsPerSample);
            TIFFSetField(image, TIFFTAG_SAMPLESPERPIXEL,samplesPerPixel);
            TIFFSetField(image, TIFFTAG_PHOTOMETRIC, photometric);
            TIFFSetField(image, TIFFTAG_COMPRESSION, COMPRESSION_PACKBITS); 
            TIFFSetField(image, TIFFTAG_FILLORDER, FILLORDER_MSB2LSB);
            TIFFSetField(image, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);

            //uint32 rowsperstrip = TIFFDefaultStripSize(image, -1); 
            //TIFFSetField(image, TIFFTAG_ROWSPERSTRIP, rowsperstrip);
            
            // Write the information to the file
            for(int i = 0; i < img.t(); ++i) {
                TIFFWriteScanline(image,(tdata_t)img.data(0,img.t()-i-1),i,0);
            }

            // Close the file
            TIFFClose(image);

            return WriteResult::FILE_SAVED;
        }

        virtual ReadResult readObject(std::istream& fin,const osgDB::ReaderWriter::Options* options =NULL) const
        {
            return readImage(fin, options);
        }

        virtual ReadResult readObject(const std::string& file, const osgDB::ReaderWriter::Options* options =NULL) const
        {
            return readImage(file, options);
        }

        virtual ReadResult readImage(std::istream& fin,const osgDB::ReaderWriter::Options* =NULL) const
        {
            return readTIFStream(fin);
        }

        virtual ReadResult readImage(const std::string& file, const osgDB::ReaderWriter::Options* options) const
        {
            std::string ext = osgDB::getLowerCaseFileExtension(file);
            if (!acceptsExtension(ext)) return ReadResult::FILE_NOT_HANDLED;

            std::string fileName = osgDB::findDataFile( file, options );
            if (fileName.empty()) return ReadResult::FILE_NOT_FOUND;

            std::ifstream istream(fileName.c_str(), std::ios::in | std::ios::binary);
            if(!istream) return ReadResult::FILE_NOT_HANDLED;
            ReadResult rr = readTIFStream(istream);
            if(rr.validImage()) rr.getImage()->setFileName(file);
            return rr;
        }

        virtual WriteResult writeImage(const osg::Image& img,std::ostream& fout,const osgDB::ReaderWriter::Options* /*options*/) const
        {
            WriteResult::WriteStatus ws = writeTIFStream(fout,img);
            return ws;
        }

        virtual WriteResult writeImage(const osg::Image &img,const std::string& fileName, const osgDB::ReaderWriter::Options *options) const
        {
            std::string ext = osgDB::getFileExtension(fileName);
            if (!acceptsExtension(ext)) return WriteResult::FILE_NOT_HANDLED;

            std::ofstream fout(fileName.c_str(), std::ios::out | std::ios::binary);
            if(!fout) return WriteResult::ERROR_IN_WRITING_FILE;

            return writeImage(img,fout,options);
        }
};

// now register with Registry to instantiate the above
// reader/writer.
REGISTER_OSGPLUGIN(tiff, ReaderWriterTIFF)