void MStarguider::WritePNG ( const char *  name, const byte *  gbuf, const byte *  cbuf  )

private

Definition at line 976 of file MStarguider.cc.

References fScreenshotColor.

Referenced by ProcessFrame().

{
    string fname(name);
    if (fname.size()<4 || fname.compare(fname.size()-4,4, ".png")==0)
        fname += ".png";

    cout << "Writing PNG '" << fname << "'" << endl;

#ifdef HAVE_PNG
    //
    // open file
    //
    FILE *fd = fopen(fname.c_str(), "w");
    if (!fd)
    {
        cout << "Warning: Cannot open file for writing." << endl;
        return;
    }

    //
    // allocate memory
    //
    png_structp fPng = png_create_write_struct(PNG_LIBPNG_VER_STRING,
                                               NULL, NULL, NULL);

    if (!fPng)
    {
        cout << "Warning: Unable to create PNG structure" << endl;
        fclose(fd);
        return;
    }


    png_infop fInfo = png_create_info_struct(fPng);

    if (!fInfo)
    {
        cout << "Warning: Unable to create PNG info structure" << endl;
        png_destroy_write_struct (&fPng, NULL);
        fclose(fd);
        return;
    }

    fInfo->width      = 768;
    fInfo->height     = 576;
    fInfo->bit_depth  = 8;
    fInfo->color_type = PNG_COLOR_TYPE_RGB;
//    fInfo->color_type = PNG_COLOR_TYPE_GRAY;

    //
    // set jump-back point in case of errors
    //
    if (setjmp(fPng->jmpbuf))
    {
        cout << "longjmp Warning: PNG encounterd an error!" << endl;
        png_destroy_write_struct (&fPng, &fInfo);
        fclose(fd);
        return;
    }

    //
    // connect file to PNG-Structure
    //
    png_init_io(fPng, fd);

    // png_set_compression_level (fPng, Z_BEST_COMPRESSION);

    //
    // Write header
    //
    png_write_info(fPng, fInfo);

    png_byte buf[768*576*3];

    png_byte *d = buf;
    const byte *g = gbuf;
    const byte *c = cbuf;

    // d=destination, s1=source1, s2=source2, e=end
    while (d<buf+768*576*3)
    {
        if (fScreenshotColor && *c)
        {
            *d++ = ((*c>>4)&0x3)*85;
            *d++ = ((*c>>2)&0x3)*85;
            *d++ = ((*c++ )&0x3)*85;
            g++;
        }
        else
        {
            *d++ = *g;
            *d++ = *g;
            *d++ = *g++;
            c++;
        }
    }

    //
    // Write bitmap data
    //
    for (unsigned int y=0; y<768*576*3; y+=768*3)
        png_write_row (fPng, buf+y);

    //
    // Write footer
    //
    png_write_end (fPng, fInfo);

    //
    // free memory
    //
    png_destroy_write_struct (&fPng, &fInfo);

    fclose(fd);
#else
    cout << "Sorry, no png support compiled into tpoint." << endl;
#endif
}

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