kscreensaver/xsavers/xlock.cpp

   1 //----------------------------------------------------------------------------
   2 // This module contains code to interface original xlock savers to
   3 // kscreensave
   4 //
   5
   6 #include <time.h>
   7 #include <qapplication.h>
   8 #include <QX11Info>
   9 #include "xlock.h"
  10
  11
  12 int screen;
  13 Display *dsp;
  14 perscreen Scr[MAXSCREENS];
  15 int batchcount = 100;
  16 int cycles = 100;
  17 Bool mono = 0;
  18 //Bool allowroot = 0;
  19 char *ProgramName;
  20 /*
  21 Dr. Park's algorithm published in the Oct. '88 ACM
  22 "Random Number Generators: Good Ones Are Hard To Find"
  23 His version available at ftp://cs.wm.edu/pub/rngs.tar
  24 Present form by many authors.
  25 */
  26
  27 static int Seed = 1;       /* This is required to be 32 bits long */
  28
  29 /*
  30  *      Given an integer, this routine initializes the RNG seed.
  31  */
  32 void SetRNG(long s)
  33 {
  34         Seed = (int) s;
  35 }
  36
  37 /*
  38  *      Returns an integer between 0 and 2147483647, inclusive.
  39  */
  40 long LongRNG()
  41 {
  42         if ((Seed = Seed % 44488 * 48271 - Seed / 44488 * 3399) < 0)
  43                 Seed += 2147483647;
  44         return (long) (Seed - 1);
  45 }
  46
  47 unsigned long
  48 allocpixel(Colormap cmap, const char *name, const char *def)
  49 {
  50         XColor      col;
  51         XColor      tmp;
  52         XParseColor(dsp, cmap, name, &col);
  53         if (!XAllocColor(dsp, cmap, &col))
  54         {
  55                 fprintf(stderr, "couldn't allocate: %s, using %s instead\n", name, def);
  56                 XAllocNamedColor(dsp, cmap, def, &col, &tmp);
  57         }
  58
  59         return col.pixel;
  60 }
  61
  62 void initXLock( GC gc )
  63 {
  64         SetRNG( time(NULL) );
  65
  66         dsp = QX11Info::display();
  67         screen = qt_xscreen();
  68
  69         Screen *scr = ScreenOfDisplay(dsp, screen);
  70
  71         Scr[0].gc = gc;
  72         Scr[0].npixels = NUMCOLORS;
  73         Scr[0].cmap = None;
  74
  75         Colormap    cmap = DefaultColormapOfScreen(scr);
  76         Scr[0].bgcol = allocpixel(cmap, "background", "White");
  77         Scr[0].bgcol = allocpixel(cmap, "foreground", "Black");
  78
  79         QColor color;
  80
  81         for ( int i = 0; i < NUMCOLORS; i++ )
  82         {
  83                 color.setHsv( i * 360 / NUMCOLORS, 255, 255 );
  84                 Scr[0].pixels[i] = color.alloc();
  85         }
  86 }
  87