2005.10.24 20:16 "Re: [Tiff] How can I insert IFD at custom index?", by Andrey Kiselev

On Tue, Oct 25, 2005 at 12:02:32AM +0400, Andrey Kiselev wrote:

You can write IFD either at the end of file (using usual method) or at the any position using the TIFFCheckpointDirectory() function. The IFD structure will be dumped out immediately whenever the TIFFCheckpointDirectory() will be called. See the attached sample code,

Forgot to attach the sample.

--
Andrey V. Kiselev

Home phone: +7 812 5970603 ICQ# 26871517

#include <stdio.h>
#include "tiffio.h"

#define XSIZE 256
#define YSIZE 256

int main (int argc, char **argv)
{
    uint32 image_width, image_height, checkpoint;
    float xres, yres;
    uint16 spp, bpp, photo, res_unit;
    TIFF *out;
    int i, j;

unsigned char array[XSIZE * YSIZE];

for (j = 0; j < YSIZE; j++)
        for(i = 0; i < XSIZE; i++)
                array[j * XSIZE + i] = (unsigned char)(i * j);

out = TIFFOpen("out.tif", "w");
if (!out)
{
        fprintf (stderr, "Can't open %s for writing\n", argv[1]);
        return 1;
}
image_width = XSIZE;
image_height = YSIZE;
spp = 1; /* Samples per pixel */
bpp = 8; /* Bits per sample */
photo = PHOTOMETRIC_MINISBLACK;

TIFFSetField(out, TIFFTAG_IMAGEWIDTH, image_width / spp);

TIFFSetField(out, TIFFTAG_IMAGELENGTH, image_height);

TIFFSetField(out, TIFFTAG_BITSPERSAMPLE, bpp);

TIFFSetField(out, TIFFTAG_SAMPLESPERPIXEL, spp);

TIFFSetField(out, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);

TIFFSetField(out, TIFFTAG_PHOTOMETRIC, photo);

TIFFSetField(out, TIFFTAG_ORIENTATION, ORIENTATION_BOTLEFT);

TIFFSetField(out,TIFFTAG_ROWSPERSTRIP, TIFFDefaultStripSize(out, 0)); xres = yres = 100;

res_unit = RESUNIT_INCH;
TIFFSetField(out, TIFFTAG_XRESOLUTION, xres);
TIFFSetField(out, TIFFTAG_YRESOLUTION, yres);

TIFFSetField(out, TIFFTAG_RESOLUTIONUNIT, res_unit);

    /*
     * We will set the DateTime tag to easy locate the IFD position
     * in the written file.
     */
    TIFFSetField(out, TIFFTAG_DATETIME, "THIS IS DATETIME   ");

    /* 
     * Write out the image data until the checkpoints lines will be written.
     * Afterwards dump out IFD structure and continue writing the rest of
     * scanlines.
     */

checkpoint = image_height / 2;
for (j = 0; j < checkpoint; j++)
    TIFFWriteScanline(out, &array[j * image_width], j, 0);
TIFFCheckpointDirectory(out);
for (j = checkpoint; j < image_height; j++)
    TIFFWriteScanline(out, &array[j * image_width], j, 0);

TIFFClose(out);

    return 0;
}