postscript_utils.h

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/* Copyright (C) 2013-2016, The Regents of The University of Michigan.
All rights reserved.

This software was developed in the APRIL Robotics Lab under the
direction of Edwin Olson, ebolson@umich.edu. This software may be
available under alternative licensing terms; contact the address above.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this
   list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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*/

#ifndef _POSTSCRIPT_UTILS_H
#define _POSTSCRIPT_UTILS_H

// write commands in postscript language to render an image in the current
// graphics environment. The image will be rendered in one pixel per unit
// with Y up coordinate axis (e.g. upside down).
static void postscript_image(FILE *f, image_u8_t *im)
{
//    fprintf(f, "/readstring {\n  currentfile exch readhexstring pop\n} bind def\n");
    fprintf(f, "/picstr %d string def\n", im->width);

    fprintf(f, "%d %d 8 [1 0 0 1 0 0]\n",
            im->width, im->height);

    fprintf(f, "{currentfile picstr readhexstring pop}\nimage\n");

    for (int y = 0; y < im->height; y++) {
        for (int x = 0; x < im->width; x++) {
            uint8_t v = im->buf[y*im->stride + x];
            fprintf(f, "%02x", v);
            if ((x % 32)==31)
                fprintf(f, "\n");
        }
    }

    fprintf(f, "\n");
}

#endif