[Okular-devel] [okular] [Bug 344287] Open floating point tiffs

[Mikhail Kandel]

https://bugs.kde.org/show_bug.cgi?id=344287

--- Comment #4 from Mikhail Kandel <kandel3 at illinois.edu> ---
I read them where T=float:

static
        TIFFImage<T> readBuffer(const char* fname)//deallocate with 
    {
        TIFF* tif = TIFFOpen(fname, "r");//tiff open catch error?
        assert(tif);
        int imgH, imgW;
        TIFFGetField(tif, TIFFTAG_IMAGELENGTH, &imgH);
        TIFFGetField(tif, TIFFTAG_IMAGEWIDTH, &imgW);
        int rowsize = imgW*sizeof(T);
        auto mydata = (unsigned char*)malloc(rowsize*imgH);
        for (int row = 0; row < imgH; row++)
        {
            auto toMe = (void*)&mydata[rowsize*row];
            TIFFReadScanline(tif, toMe, row);
        }
        TIFFClose(tif);
        TIFFImage<T> s;
        s.c = imgW;
        s.r = imgH;
        s.img = (T*)mydata;
        return s;
    }


write them like

    static void writeTiffFast(const char* name, const void* buffer, unsigned
int w, unsigned int h, bool isfloat, bool fast=false, const TiffExtraMetaData*
meta = nullptr)
    {
        assert((w>0) && (h > 0));
        TIFF* tif = TIFFOpen(name, "w");//quality error correcting code
        TIFFSetField(tif, TIFFTAG_IMAGEWIDTH, w);  // set the width of the
image
        TIFFSetField(tif, TIFFTAG_IMAGELENGTH, h);    // set the height of the
image
        TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 1);   // set number of
channels per pixel
        TIFFSetField(tif, TIFFTAG_COMPRESSION, COMPRESSION_NONE);
        TIFFSetField(tif, TIFFTAG_SOFTWARE, "QLI SLIM5");
        TIFFSetField(tif, TIFFTAG_MAKE, "Mikhail Kandel");
        if (meta!=nullptr)
        {
            TIFFSetField(tif, TIFFTAG_DATETIME, meta->datetime);
        }
        else
        {
            //get default meta data;
            TiffExtraMetaData defaulto;
            TIFFSetField(tif, TIFFTAG_DATETIME, defaulto.datetime);
        }
        TIFFSetField(tif, TIFFTAG_MODEL, __DATE__);
        int rowsize = 0;
        if (isfloat)
        {
            //todo write a LUT
            //TIFFSetField(tif, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_MINISWHITE);
            TIFFSetField(tif, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_MINISBLACK);
            TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, 8 * sizeof(float));    //
set the size of the channels
            TIFFSetField(tif, TIFFTAG_SAMPLEFORMAT, SAMPLEFORMAT_IEEEFP);   //
set number of channels per pixel
            rowsize = w*sizeof(float);
        }
        else
        {
            TIFFSetField(tif, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_MINISBLACK);
            TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, 8 * sizeof(unsigned
short));    // set the size of the channels
            TIFFSetField(tif, TIFFTAG_SAMPLEFORMAT, SAMPLEFORMAT_UINT);   //
set number of channels per pixel
            rowsize = w*sizeof(unsigned short);
        }
        if (fast)
            //if (0) //todo make this work ?
        {
            TIFFSetField(tif, TIFFTAG_ROWSPERSTRIP, h);
            int bytesize = rowsize*h;
            TIFFWriteRawStrip(tif, 1, (void*)buffer, bytesize);
        }
        else
        {
            TIFFSetField(tif, TIFFTAG_ROWSPERSTRIP, 1);
            for (unsigned int r = 0; r < h; r++)//'r' for row
            {
                auto aschar = (unsigned char*)buffer;
                auto data = &aschar[rowsize*r];
                TIFFWriteScanline(tif, data, r);
            }
        }
        TIFFClose(tif);
    }

-- 
You are receiving this mail because:
You are the assignee for the bug.