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xlib.c

/* 
 *     XaoS, a fast portable realtime fractal zoomer 
 *                  Copyright (C) 1996,1997 by
 *
 *      Jan Hubicka          (hubicka@paru.cas.cz)
 *      Thomas Marsh         (tmarsh@austin.ibm.com)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
#include "aconfig.h"
#ifdef X11_DRIVER
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <config.h>
#ifndef NO_MALLOC_H
#include <malloc.h>
#endif
#include "xlib.h"
#ifdef AMIGA
#define XFlush(x) while(0)
#endif

#define chkalloc(n) if (!n) fprintf(stderr, "out of memory\n"), exit(-1)

extern int prog_argc;
extern char **prog_argv;
Atom wmDeleteWindow;

int
xupdate_size (xdisplay * d)
{
  int tmp;
  Window wtmp;
  unsigned int width = d->width, height = d->height;
  XSync (d->display, False);
  XGetGeometry (d->display, d->window, &wtmp, &tmp, &tmp, &d->width,
            &d->height, (unsigned int *) &tmp, (unsigned int *) &tmp);
  if (d->width != width || d->height != height)
    return 1;
  return 0;
}

void
xflip_buffers (xdisplay * d)
{
  d->back = d->vbuffs[d->current];
  d->current ^= 1;
  d->vbuff = d->vbuffs[d->current];
}


void
draw_screen (xdisplay * d)
{
#ifdef MITSHM
  if (d->SharedMemFlag)
    {
      XShmPutImage (d->display, d->window, d->gc, d->image[d->current], 0, 0,
                0, 0, d->bwidth, d->bheight, True);
    }
  else
#endif
    XPutImage (d->display, d->window, d->gc, d->image[d->current], 0, 0, 0, 0,
             d->bwidth, d->bheight);
/*XFlush(d->display); *//*gives small rest to X but degrades perofrmance
   too much */
  d->screen_changed = 0;
}

#ifdef MITSHM
int
alloc_shm_image (xdisplay * new)
{
  register char *ptr;
  int temp, size = 0, i;
  ptr = DisplayString (new->display);
  if (!ptr || (*ptr == ':') || !strncmp (ptr, "localhost:", 10) ||
      !strncmp (ptr, "unix:", 5) || !strncmp (ptr, "local:", 6))
    {
      new->SharedMemOption =
      XQueryExtension (new->display, "MIT-SHM", &temp, &temp, &temp);
    }
  else
    {
      new->SharedMemOption = False;
      return 0;
    }
  new->SharedMemFlag = False;

  if (new->SharedMemFlag)
    {
      XShmDetach (new->display, &new->xshminfo[0]);
      XShmDetach (new->display, &new->xshminfo[1]);
      new->image[0]->data = (char *) NULL;
      new->image[1]->data = (char *) NULL;
      shmdt (new->xshminfo[0].shmaddr);
      shmdt (new->xshminfo[1].shmaddr);
    }
  for (i = 0; i < 2; i++)
    {
      if (new->SharedMemOption)
      {
        new->SharedMemFlag = False;
        new->image[i] =
          XShmCreateImage (new->display, new->visual, new->depth,
                       new->depth == 1 ? XYBitmap : ZPixmap, NULL,
                       &new->xshminfo[i], new->width, new->height);
        if (new->image[i])
          {
            temp =
            new->image[i]->bytes_per_line * (new->image[i]->height + 150);
            new->linewidth = new->image[i]->bytes_per_line;
            if (temp > size)
            size = temp;
            new->xshminfo[i].shmid =
            shmget (IPC_PRIVATE, size, IPC_CREAT | 0777);
            if (new->xshminfo[i].shmid != -1)
            {
              errno = 0;
              new->xshminfo[i].shmaddr =
                (char *) shmat (new->xshminfo[i].shmid, 0, 0);
              if (!errno)
                {
                  new->image[i]->data = new->xshminfo[i].shmaddr;
                  new->data[i] = new->vbuffs[i] =
                  (char *) new->image[i]->data;
                  new->xshminfo[i].readOnly = True;

                  new->SharedMemFlag =
                  XShmAttach (new->display, &new->xshminfo[i]);
                  XSync (new->display, False);
                  if (!new->SharedMemFlag)
                  {
                    XDestroyImage (new->image[i]);
                    new->image[i] = (XImage *) NULL;
                    new->SharedMemFlag = 0;
                    return 0;
                  }
                }
              /* Always Destroy Shared Memory Ident */
              shmctl (new->xshminfo[i].shmid, IPC_RMID, 0);
            }
            if (!new->SharedMemFlag)
            {
              XDestroyImage (new->image[i]);
              new->image[i] = (XImage *) NULL;
              new->SharedMemFlag = 0;
              return 0;
            }
          }
        else
          {
            new->SharedMemFlag = 0;
            return 0;
          }
      }
      else
      {
        new->SharedMemFlag = 0;
        return 0;
      }
    }
  new->current = 0;
  xflip_buffers (new);
  return 1;
}

void
free_shm_image (xdisplay * d)
{
  if (d->SharedMemFlag)
    {
      XDestroyImage (d->image[0]);
      XDestroyImage (d->image[1]);
      XShmDetach (d->display, &d->xshminfo[0]);
      XShmDetach (d->display, &d->xshminfo[1]);
      shmdt (d->xshminfo[0].shmaddr);
      shmdt (d->xshminfo[1].shmaddr);
    }
}

#endif

int
alloc_image (xdisplay * d)
{
  int i;
  d->bwidth = d->width;
  d->bheight = d->height;
#ifdef MITSHM
  if (!d->params->nomitshm && d->depth != 1 && alloc_shm_image (d))
    {
      return 1;
    }
#endif
  for (i = 0; i < 2; i++)
    {

      d->image[i] =
      XCreateImage (d->display, d->visual, d->depth,
                  d->depth == 1 ? XYBitmap : ZPixmap, 0, NULL, d->width,
                  d->height, 32, 0);
      if (d->image[i] == NULL)
      {
        printf ("Out of memory for image..exiting\n");
        exit (-1);
      }
      d->image[i]->data = malloc (d->image[i]->bytes_per_line * d->height);
      if (d->image[i]->data == NULL)
      {
        printf ("Out of memory for image buffers..exiting\n");
        exit (-1);
      }
      {
      unsigned char c[4];
      int byteexact = 0;
      *(unsigned short *) c = 0xff;
      if ((!(d->image[i]->red_mask & ~0xffU)
           || !(d->image[i]->red_mask & ~0xff00U)
           || !(d->image[i]->red_mask & ~0xff0000U)
           || !(d->image[i]->red_mask & ~0xff000000U))
          && (!(d->image[i]->green_mask & ~0xffU)
            || !(d->image[i]->green_mask & ~0xff00U)
            || !(d->image[i]->green_mask & ~0xff0000U)
            || !(d->image[i]->green_mask & ~0xff000000U))
          && (!(d->image[i]->blue_mask & ~0xffU)
            || !(d->image[i]->blue_mask & ~0xff00U)
            || !(d->image[i]->blue_mask & ~0xff0000U)
            || !(d->image[i]->blue_mask & ~0xff000000U)))
        byteexact = 1;
      if (!byteexact)
        {
          /*Make endianity correct */
          if (c[0] == (unsigned char) 0xff)
            {
            if (d->image[i]->byte_order != LSBFirst)
              {
                d->image[i]->byte_order = LSBFirst;
                /*XInitImage(d->image[i]); */
              }
            }
          else
            {
            if (d->image[i]->byte_order != MSBFirst)
              {
                d->image[i]->byte_order = MSBFirst;
                /*XInitImage(d->image[i]); */
              }
            }
        }
      }
      d->data[i] = d->vbuffs[i] = (char *) d->image[i]->data;
      d->linewidth = d->image[i]->bytes_per_line;
    }
  xflip_buffers (d);
  return 1;
}

void
free_image (xdisplay * d)
{
#ifdef MITSHM
  if (d->SharedMemFlag)
    {
      free_shm_image (d);
      return;
    }
#endif
  XDestroyImage (d->image[0]);
  XDestroyImage (d->image[1]);
}

#define MAX(x,y) ((x)>(y)?(x):(y))


xdisplay *
xalloc_display (CONST char *s, int x, int y, xlibparam * params)
{
  xdisplay *new;
  Visual *defaultvisual;
  XVisualInfo vis;
  int found;
  int i;

  XClassHint classHint;
  XWMHints *hints;
  char **faked_argv;

  new = (xdisplay *) calloc (sizeof (xdisplay), 1);
  chkalloc (new);
  new->display = XOpenDisplay (params->display);
  if (!new->display)
    {
      free ((void *) new);
      return NULL;
    }
  new->screen = DefaultScreen (new->display);

  new->attributes =
    (XSetWindowAttributes *) malloc (sizeof (XSetWindowAttributes));
  chkalloc (new->attributes);
  new->attributes->background_pixel = BlackPixel (new->display, new->screen);
  new->attributes->border_pixel = BlackPixel (new->display, new->screen);
  new->attributes->event_mask = ButtonPressMask | StructureNotifyMask |
    ButtonReleaseMask | PointerMotionMask | KeyPressMask |
    ExposureMask | KeyReleaseMask;


  new->attr_mask = CWBackPixel | CWEventMask;
  if (params->fullscreen || params->rootwindow)
    {
      new->attributes->override_redirect = True;
      new->attr_mask |= CWOverrideRedirect;
    }
  else
    new->attr_mask |= CWBorderPixel;
  new->class = InputOutput;
  new->xcolor.n = 0;
  new->parent_window = RootWindow (new->display, new->screen);
  defaultvisual = DefaultVisual (new->display, new->screen);
  new->params = params;
  new->visual = defaultvisual;
  vis.depth = new->depth = DefaultDepth (new->display, new->screen);
  found = 0;
  for (i = 32; i > 13 && !found; i--)
    if (XMatchVisualInfo (new->display, new->screen, i, TrueColor, &vis))
      {
      found = 1;
      }
  if (defaultvisual->class != StaticGray && defaultvisual->class != GrayScale)
    {
      for (i = 8; i && !found; i--)
      if (XMatchVisualInfo
          (new->display, new->screen, i, PseudoColor, &vis))
        {
          found = 1;
        }
      for (i = 8; i && !found; i--)
      if (XMatchVisualInfo
          (new->display, new->screen, i, StaticColor, &vis))
        {
          found = 1;
        }
      for (i = 8; i && !found; i--)
      if (XMatchVisualInfo (new->display, new->screen, i, TrueColor, &vis))
        {
          found = 1;
        }
    }
  if (!found
      && XMatchVisualInfo (new->display, new->screen, 8, StaticGray, &vis))
    {
      found = 1;
    }
  for (i = 8; i && !found; i--)
    if (XMatchVisualInfo (new->display, new->screen, i, GrayScale, &vis))
      {
      found = 1;
      }
  if (!found
      && XMatchVisualInfo (new->display, new->screen, 1, StaticGray, &vis))
    {
      found = 8;
    }
  if (!found)
    {
      new->visual = defaultvisual;
      vis.depth = new->depth = DefaultDepth (new->display, new->screen);
    }
  else
    {
      new->visual = vis.visual;
      new->depth = vis.depth;
    }

  switch (new->visual->class)
    {
    case StaticColor:
    case StaticGray:
    smallcolor:
      new->truecolor = 0;
      new->fixedcolormap = 1;
      break;
    case PseudoColor:
    case GrayScale:
      if (new->depth <= 8)
      {
        new->truecolor = 0;
        new->fixedcolormap = 0;
      }
      else
      {
        goto visuals;
      }
      break;
    case TrueColor:
      new->truecolor = 1;
      new->fixedcolormap = 1;
      if (new->depth <= 8)
      goto smallcolor;
      if (new->depth > 32)
      {
        goto visuals;
      }
      break;
    default:
    visuals:
      printf
      ("Unusuported visual. Please contact authors. Maybe it will be supported in next release:)\n");
      return (NULL);
    }
  new->privatecolormap = params->privatecolormap;
  new->attributes->colormap = new->defaultcolormap =
    DefaultColormap (new->display, new->screen);
  if (new->visual->visualid != defaultvisual->visualid)
    {
      new->privatecolormap = 1;
    }
  if ( /*!new->fixedcolormap && */ new->privatecolormap)
    {
      unsigned long pixels[256];
      int i;
      new->attributes->colormap =
      XCreateColormap (new->display, RootWindow (new->display, new->screen),
                   new->visual, AllocNone);
      if (new->visual->visualid == defaultvisual->visualid
        && new->visual->class == PseudoColor)
      {
        XAllocColorCells (new->display, new->attributes->colormap, 1, 0, 0,
                      pixels, MAX (new->visual->map_entries, 256));
        for (i = 0; i < 16; i++)
          {
            new->xcolor.c[i].pixel = pixels[i];
          }
        XQueryColors (new->display, new->defaultcolormap, new->xcolor.c,
                  16);
        XStoreColors (new->display, new->attributes->colormap,
                  new->xcolor.c, 16);
      }
    }
  new->colormap = new->attributes->colormap;
  new->attr_mask |= CWColormap;

  new->window_name = (char *) s;
  new->height = y;
  new->width = x;
  new->border_width = 2;
  new->lastx = 0;
  new->lasty = 0;
  new->font_struct = (XFontStruct *) NULL;

  if (params->fullscreen || params->rootwindow)
    {
      Window wtmp;
      int tmp;
      /* Get size of the root window */
      XGetGeometry (new->display, RootWindow (new->display, new->screen), &wtmp, &tmp, &tmp, &new->width, &new->height, (unsigned int *) &tmp,  /* border width */
                (unsigned int *) &tmp);   /* depth */
      new->border_width = 0;
    }

  if (params->windowid != -1)
    {
      Window wtmp;
      int tmp;

      new->parent_window = params->windowid;
      XGetGeometry (new->display, new->parent_window, &wtmp, &tmp, &tmp, &new->width, &new->height, (unsigned int *) &tmp,    /* border width */
                (unsigned int *) &tmp);   /* depth */
      XSelectInput (new->display, new->parent_window, ResizeRedirectMask);
    }
  if (params->rootwindow)
    new->window = RootWindow (new->display, new->screen);
  else
    new->window = XCreateWindow (new->display, new->parent_window, 0, 0,
                         new->width, new->height, new->border_width,
                         new->depth, new->class, new->visual,
                         new->attr_mask, new->attributes);

  classHint.res_name = (char *) "xaos";
  classHint.res_class = (char *) "XaoS";
  hints = XAllocWMHints ();
  hints->initial_state = NormalState;
  hints->window_group = new->window;
  hints->flags = (WindowGroupHint | StateHint);

  {
    int fake = 0;

    if (prog_argc < 2)
      fake = 1;

    if (fake == 0)
      if (strcmp (prog_argv[prog_argc - 2], "-driver") &&
        strcmp (prog_argv[prog_argc - 1], "x11"))
      fake = 1;

    if (fake)
      {
      int i;
      faked_argv = (char **) malloc ((prog_argc + 2) * sizeof (char *));
      for (i = 0; i < prog_argc; i++)
        faked_argv[i] = prog_argv[i];
      faked_argv[prog_argc] = (char *) "-driver";
      faked_argv[prog_argc + 1] = (char *) "x11";

      XSetWMProperties (new->display, new->window, NULL, NULL, faked_argv,
                    prog_argc + 2, NULL, hints, &classHint);

      free (faked_argv);
      }
    else
      XSetWMProperties (new->display, new->window, NULL, NULL, prog_argv,
                  prog_argc, NULL, hints, &classHint);
  }
  XSetIconName (new->display, new->window, "xaos");

  wmDeleteWindow = XInternAtom (new->display, "WM_DELETE_WINDOW", False);
  XSetWMProtocols (new->display, new->window, &wmDeleteWindow, 1);

  new->gc = XCreateGC (new->display, new->window, 0L, &(new->xgcvalues));
  XSetBackground (new->display, new->gc,
              BlackPixel (new->display, new->screen));
  XSetForeground (new->display, new->gc,
              WhitePixel (new->display, new->screen));
  XStoreName (new->display, new->window, new->window_name);
  XMapWindow (new->display, new->window);
  if (params->fullscreen || params->rootwindow)
    XSetInputFocus (new->display, new->window, RevertToNone, CurrentTime);

  return (new);
}

void
xsetcolor (xdisplay * d, int col)
{
  switch (col)
    {
    case 0:
      XSetForeground (d->display, d->gc, BlackPixel (d->display, d->screen));
      break;
    case 1:
      XSetForeground (d->display, d->gc, WhitePixel (d->display, d->screen));
      break;
    default:
      if ((col - 2) > d->xcolor.n)
      {
        fprintf (stderr, "color error\n");
        exit (-1);
      }
      XSetForeground (d->display, d->gc, d->xcolor.c[col - 2].pixel);
      break;
    }
}
void
xsetpaletterange (xdisplay * d, ui_palette c, int start, int end)
{
  int i;
  if (d->visual->class == StaticColor || d->visual->class == TrueColor)
    {
      for (i = start; i < end; i++)
      d->xcolor.c[i].pixel = i;
      XQueryColors (d->display, d->colormap, d->xcolor.c + start,
                end - start);
      for (i = start; i < end; i++)
      {
        c[i - start][0] = d->xcolor.c[i].red / 256;
        c[i - start][1] = d->xcolor.c[i].green / 256;
        c[i - start][2] = d->xcolor.c[i].blue / 256;
      }

    }
  else
    {
      for (i = start; i < end; i++)
      {
        d->xcolor.c[i].pixel = i;
        d->xcolor.c[i].flags = DoRed | DoGreen | DoBlue;
        d->xcolor.c[i].red = c[i - start][0] * 256;
        d->xcolor.c[i].green = c[i - start][1] * 256;
        d->xcolor.c[i].blue = c[i - start][2] * 256;
      }
      XStoreColors (d->display, d->colormap, d->xcolor.c + start,
                end - start);
    }
}
int
xalloc_color (xdisplay * d, int r, int g, int b, int readwrite)
{
  d->xcolor.n++;
  d->xcolor.c[d->xcolor.n - 1].flags = DoRed | DoGreen | DoBlue;
  d->xcolor.c[d->xcolor.n - 1].red = r;
  d->xcolor.c[d->xcolor.n - 1].green = g;
  d->xcolor.c[d->xcolor.n - 1].blue = b;
  d->xcolor.c[d->xcolor.n - 1].pixel = d->xcolor.n - 1;
  if ((readwrite && !d->fixedcolormap) || d->privatecolormap)
    {
      unsigned long cell;
      if (d->privatecolormap)
      {
        cell = d->xcolor.c[d->xcolor.n - 1].pixel += 16;
        if ((int) d->xcolor.c[d->xcolor.n - 1].pixel >=
            d->visual->map_entries)
          {
            d->xcolor.n--;
            return (-1);
          }
      }
      else
      {
        if (!XAllocColorCells (d->display, d->colormap, 0, 0, 0, &cell, 1))
          {
            d->xcolor.n--;
            if (d->xcolor.n <= 32)
            printf
              ("Colormap is too full! close some colorfull applications or use -private\n");
            return (-1);
          }
        d->xcolor.c[d->xcolor.n - 1].pixel = cell;
      }
      XStoreColor (d->display, d->colormap, &(d->xcolor.c[d->xcolor.n - 1]));
      return ((int) cell);
    }
  if (!XAllocColor (d->display, d->colormap, &(d->xcolor.c[d->xcolor.n - 1])))
    {
      d->xcolor.n--;
      if (d->xcolor.n <= 32)
      printf
        ("Colormap is too full! close some colorfull aplications or use -private\n");
      return (-1);
    }
  d->pixels[d->xcolor.n - 1] = d->xcolor.c[d->xcolor.n - 1].pixel;
  return (d->depth !=
        8 ? d->xcolor.n - 1 : (int) d->xcolor.c[d->xcolor.n - 1].pixel);
}

void
xfree_colors (xdisplay * d)
{
  unsigned long pixels[256];
  int i;
  for (i = 0; i < d->xcolor.n; i++)
    pixels[i] = d->xcolor.c[i].pixel;
  if (!d->privatecolormap)
    XFreeColors (d->display, d->colormap, pixels, d->xcolor.n, 0);
  d->xcolor.n = 0;
}

void
xfree_display (xdisplay * d)
{
  XSync (d->display, 0);
  if (d->font_struct != (XFontStruct *) NULL)
    {
      XFreeFont (d->display, d->font_struct);
    }
  XUnmapWindow (d->display, d->window);
  XDestroyWindow (d->display, d->window);
  XCloseDisplay (d->display);
  free ((void *) d->attributes);
  free ((void *) d);
}

void
xclear_screen (xdisplay * d)
{
  XClearWindow (d->display, d->window);
  d->screen_changed = 1;
}

void
xmoveto (xdisplay * d, int x, int y)
{
  d->lastx = x, d->lasty = y;
}

int
xsetfont (xdisplay * d, CONST char *font_name)
{

  if (d->font_struct != (XFontStruct *) NULL)
    {
      XFreeFont (d->display, d->font_struct);
    }
  d->font_struct = XLoadQueryFont (d->display, font_name);
  XSetFont (d->display, d->gc, d->font_struct->fid);
  if (!d->font_struct)
    {
      fprintf (stderr, "could not load font: %s\n", font_name);
      exit (-1);
    }
  return (d->font_struct->max_bounds.ascent +
        d->font_struct->max_bounds.descent);
}

void
xouttext (xdisplay * d, CONST char *string)
{
  int sz;

  sz = (int) strlen (string);
  XDrawImageString (d->display, d->window, d->gc, d->lastx, d->lasty,
                string, sz);
}

void
xresize (xdisplay * d, XEvent * ev)
{
  XSync (d->display, False);
  d->width = ev->xconfigure.width;
  d->height = ev->xconfigure.height;
}

#endif

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