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annotate lcdemu/ximage.c @ 10:ad0d9f7c06e9 default tip

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README: update for the present situation
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 29 Dec 2019 23:01:26 +0000
parents e7f1035f10d4
children
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e7f1035f10d4 lcdemu: initial import from freecalypso-tools
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1 /*
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2 * LCDemu based on HECterm by the same author
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3 * XImage conversion muck
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4 */
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5
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6 #include <stdio.h>
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7 #include <stdint.h>
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8 #include <stdlib.h>
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9 #include <string.h>
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10 #include <strings.h>
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11 #include <X11/Xlib.h>
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12 #include <X11/Xresource.h>
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13 #include <X11/Xutil.h>
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14 #include "globals.h"
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15
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16 XImage *
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17 convert_image_depth24(input, npix)
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18 uint16_t *input;
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19 int npix;
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20 {
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21 uint32_t *imgbuf;
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22 int i, in, r, g, b;
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23 XImage *img;
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24
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25 imgbuf = malloc(npix * 4);
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26 if (!imgbuf) {
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27 perror("malloc");
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28 exit(1);
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29 }
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30 for (i = 0; i < npix; i++) {
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31 in = input[i];
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32 r = (in & 0xF800) << 8;
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33 g = (in & 0x07E0) << 5;
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34 b = (in & 0x001F) << 3;
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35 imgbuf[i] = r | g | b;
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36 }
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37 img = XCreateImage(mydisplay, CopyFromParent, display_depth, ZPixmap,
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38 0, (char *) imgbuf, npix, 1, 32, 0);
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39 if (!img) {
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40 perror("XCreateImage");
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41 exit(1);
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42 }
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43 return(img);
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44 }
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45
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46 init_image_conversion()
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47 {
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48 display_depth = DefaultDepth(mydisplay, DefaultScreen(mydisplay));
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49 switch (display_depth) {
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50 case 24:
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51 convert_function = convert_image_depth24;
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52 break;
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53 default:
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54 fprintf(stderr,
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55 "error: fc-lcdemu has not been adapted for X11 depth != 24, yours is %d\n",
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56 display_depth);
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57 exit(1);
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58 }
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59 }