wmweather+-2.12/wmgeneral/xpm_trans.c

   1 #include "../config.h"
   2
   3 /*
   4         Best viewed with vim5, using ts=4
   5
   6         An add-on to wmgeneral to copy XPM areas with transparency and opacity.
   7
   8         ------------------------------------------------------------
   9
  10         Author: Brad Jorsch (anomie@users.sourceforge.net)
  11
  12         ---
  13         CHANGES:
  14     ---
  15     16/08/2001 (Brad Jorsch, anomie@users.sourceforge.net)
  16         * Wrote these routines.
  17
  18 */
  19
  20 #include <X11/Xlib.h>
  21 #include <X11/xpm.h>
  22
  23 #include "wmgeneral-x11.h"
  24
  25 extern int screen;
  26 extern XpmIcon wmgen;
  27 extern GC NormalGC;
  28
  29 static int get_shift(unsigned mask){
  30     int i=0;
  31
  32     while(!mask&1){
  33         mask>>=1;
  34         i++;
  35     }
  36     return i;
  37 }
  38
  39 void combineWithTrans(int sx, int sy, unsigned w, unsigned h, int dx, int dy){
  40     XImage *pix, *mask;
  41     unsigned int ww, hh, bar;
  42     int foo;
  43     Window baz;
  44     unsigned x, y;
  45
  46     XGetGeometry(display, wmgen.pixmap, &baz, &foo, &foo, &ww, &hh, &bar, &bar);
  47     pix=XGetImage(display, wmgen.pixmap, 0, 0, ww, hh, AllPlanes, ZPixmap);
  48     XGetGeometry(display, wmgen.mask, &baz, &foo, &foo, &ww, &hh, &bar, &bar);
  49     mask=XGetImage(display, wmgen.mask, 0, 0, ww, hh, AllPlanes, ZPixmap);
  50
  51     for(y=0; y<h; y++){
  52         for(x=0; x<w; x++){
  53             if(!XGetPixel(mask, sx+x, sy+y)) continue;
  54             XPutPixel(pix, dx+x, dy+y, XGetPixel(pix, sx+x, sy+y));
  55         }
  56     }
  57     XPutImage(display, wmgen.pixmap, NormalGC, pix, 0, 0, 0, 0, pix->width, pix->height);
  58
  59     XDestroyImage(pix);
  60     XDestroyImage(mask);
  61 }
  62
  63 void combineWithOpacity(int sx, int sy, unsigned w, unsigned h, int dx, int dy, int o){
  64     XImage *pix, *mask;
  65     unsigned int ww, hh, bar;
  66     int foo;
  67     Window baz;
  68     int rmask, gmask, bmask;
  69     int rshift, gshift, bshift;
  70     unsigned long spixel, dpixel;
  71     unsigned x, y;
  72     int c_o;
  73
  74     if(o==0) return;
  75     if(o==256){
  76         combineWithTrans(sx, sy, w, h, dx, dy);
  77         return;
  78     }
  79
  80     XGetGeometry(display, wmgen.pixmap, &baz, &foo, &foo, &ww, &hh, &bar, &bar);
  81     pix=XGetImage(display, wmgen.pixmap, 0, 0, ww, hh, AllPlanes, ZPixmap);
  82     XGetGeometry(display, wmgen.mask, &baz, &foo, &foo, &ww, &hh, &bar, &bar);
  83     mask=XGetImage(display, wmgen.mask, 0, 0, ww, hh, AllPlanes, ZPixmap);
  84
  85     if (pix->depth == DefaultDepth(display, screen)) {{
  86         Visual *visual=DefaultVisual(display, screen);
  87         rmask = visual->red_mask;
  88         gmask = visual->green_mask;
  89         bmask = visual->blue_mask;
  90     }} else {
  91         rmask = pix->red_mask;
  92         gmask = pix->green_mask;
  93         bmask = pix->blue_mask;
  94     }
  95
  96     c_o=256-o;
  97     rshift=get_shift(rmask);
  98     gshift=get_shift(gmask);
  99     bshift=get_shift(bmask);
 100 /* NOTE: >>s then <<s to prevent overflow when multiplying opacity */
 101 #define AVG(m, s) ((((((spixel&m)>>s)*o+((dpixel&m)>>s)*c_o)>>8)<<s)&m)
 102     for(y=0; y<h; y++){
 103         for(x=0; x<w; x++){
 104             if(!XGetPixel(mask, sx+x, sy+y)) continue;
 105             spixel=XGetPixel(pix, sx+x, sy+y);
 106             if(!XGetPixel(mask, dx+x, dy+y)){
 107                 XPutPixel(pix, dx+x, dy+y, spixel);
 108             } else {
 109                 dpixel=XGetPixel(pix, dx+x, dy+y);
 110                 XPutPixel(pix, dx+x, dy+y,
 111                           AVG(rmask, rshift) |
 112                           AVG(gmask, gshift) |
 113                           AVG(bmask, bshift));
 114             }
 115         }
 116     }
 117 #undef AVG
 118     XPutImage(display, wmgen.pixmap, NormalGC, pix, 0, 0, 0, 0, pix->width, pix->height);
 119
 120     XDestroyImage(pix);
 121     XDestroyImage(mask);
 122 }