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   1 /*
   2  * Copyright © 2023 Keith Packard <keithp@keithp.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  17  */
  18
  19 #define IMAGE_SCALE     8
  20 #define WIDTH   128
  21 #define HEIGHT  64
  22
  23 #define IMAGE_WIDTH     (WIDTH * IMAGE_SCALE)
  24 #define IMAGE_HEIGHT    (HEIGHT * IMAGE_SCALE)
  25 #define IMAGE_STRIDE    ((IMAGE_WIDTH + 31) / 32)
  26
  27 #define DEFAULT_WIDTH   IMAGE_WIDTH
  28 #define DEFAULT_HEIGHT  IMAGE_HEIGHT
  29
  30 #define PASS_SETUP
  31
  32 #include "frame.c"
  33 #include <ao_draw.h>
  34
  35 #include <sys/ipc.h>
  36 #include <sys/shm.h>
  37 #include <X11/extensions/XShm.h>
  38
  39 #define STRIDE  ((WIDTH + 31) / 32)
  40
  41 static uint32_t bits[STRIDE * HEIGHT];
  42
  43 static struct ao_bitmap fb = {
  44         .base = bits,
  45         .stride = STRIDE,
  46         .width = WIDTH,
  47         .height = HEIGHT
  48 };
  49
  50 static XImage *shm_image;
  51 static XImage *nonshm_image;
  52 static XShmSegmentInfo shm_info;
  53
  54 void
  55 Setup(Display *dpy, Window win)
  56 {
  57         (void) win;
  58         if (XShmQueryExtension(dpy)) {
  59                 shm_image = XShmCreateImage(dpy, visual, (unsigned) depth, ZPixmap, NULL, &shm_info, IMAGE_WIDTH, IMAGE_HEIGHT);
  60                 shm_info.shmid = shmget(IPC_PRIVATE, (size_t) (shm_image->bytes_per_line * shm_image->height), IPC_CREAT|0777);
  61                 shm_info.shmaddr = shm_image->data = shmat(shm_info.shmid, 0, 0);
  62                 shm_info.readOnly = True;
  63                 XShmAttach(dpy, &shm_info);
  64         } else {
  65                 nonshm_image = XCreateImage(dpy, visual, (unsigned) depth, ZPixmap, 0, NULL,
  66                                      IMAGE_WIDTH, IMAGE_HEIGHT, 32, IMAGE_STRIDE * 4);
  67                 nonshm_image->data = calloc((size_t) nonshm_image->bytes_per_line, (size_t) nonshm_image->height);
  68         }
  69 }
  70
  71 static void
  72 DoDisplay(Display *dpy, Window win, GC gc)
  73 {
  74         int             ix, iy, ib;
  75         int             dx, dy;
  76         XImage          *image;
  77         uint32_t        *w, *scan, d;
  78         unsigned long   white = WhitePixel(dpy, screen);
  79         unsigned long   black = BlackPixel(dpy, screen);
  80
  81         if (shm_image)
  82                 image = shm_image;
  83         else
  84                 image = nonshm_image;
  85
  86         scan = bits;
  87         for (iy = 0; iy < HEIGHT; iy++) {
  88                 w = scan;
  89                 scan += STRIDE;
  90                 for (ix = 0; ix < WIDTH; ix += 32) {
  91                         d = *w++;
  92                         for (ib = 0; ib < 32 && ix + ib < WIDTH; ib++) {
  93                                 unsigned long p = d & 1 ? white : black;
  94                                 d >>= 1;
  95                                 for (dy = 0; dy < IMAGE_SCALE; dy++) {
  96
  97                                         for (dx = 0; dx < IMAGE_SCALE; dx++) {
  98                                                 XPutPixel(image, (ix + ib) * IMAGE_SCALE + dx, iy * IMAGE_SCALE + dy, p);
  99                                         }
 100                                 }
 101                         }
 102                 }
 103         }
 104         if (shm_image)
 105                 XShmPutImage(dpy, win, gc, image, 0, 0, 0, 0, IMAGE_WIDTH, IMAGE_HEIGHT, False);
 106         else
 107                 XPutImage(dpy, win, gc, image, 0, 0, 0, 0, IMAGE_WIDTH, IMAGE_HEIGHT);
 108 }