dockapps/wmweather+/wmgeneral/xpm_trans.c
2014-10-05 19:18:49 +01:00

123 lines
3.4 KiB
C

#include "../config.h"
/*
Best viewed with vim5, using ts=4
An add-on to wmgeneral to copy XPM areas with transparency and opacity.
------------------------------------------------------------
Author: Brad Jorsch (anomie@users.sourceforge.net)
---
CHANGES:
---
16/08/2001 (Brad Jorsch, anomie@users.sourceforge.net)
* Wrote these routines.
*/
#include <X11/Xlib.h>
#include <X11/xpm.h>
#include "wmgeneral-x11.h"
extern int screen;
extern XpmIcon wmgen;
extern GC NormalGC;
static int get_shift(unsigned mask){
int i=0;
while(!mask&1){
mask>>=1;
i++;
}
return i;
}
void combineWithTrans(int sx, int sy, unsigned w, unsigned h, int dx, int dy){
XImage *pix, *mask;
unsigned int ww, hh, bar;
int foo;
Window baz;
unsigned x, y;
XGetGeometry(display, wmgen.pixmap, &baz, &foo, &foo, &ww, &hh, &bar, &bar);
pix=XGetImage(display, wmgen.pixmap, 0, 0, ww, hh, AllPlanes, ZPixmap);
XGetGeometry(display, wmgen.mask, &baz, &foo, &foo, &ww, &hh, &bar, &bar);
mask=XGetImage(display, wmgen.mask, 0, 0, ww, hh, AllPlanes, ZPixmap);
for(y=0; y<h; y++){
for(x=0; x<w; x++){
if(!XGetPixel(mask, sx+x, sy+y)) continue;
XPutPixel(pix, dx+x, dy+y, XGetPixel(pix, sx+x, sy+y));
}
}
XPutImage(display, wmgen.pixmap, NormalGC, pix, 0, 0, 0, 0, pix->width, pix->height);
XDestroyImage(pix);
XDestroyImage(mask);
}
void combineWithOpacity(int sx, int sy, unsigned w, unsigned h, int dx, int dy, int o){
XImage *pix, *mask;
unsigned int ww, hh, bar;
int foo;
Window baz;
int rmask, gmask, bmask;
int rshift, gshift, bshift;
unsigned long spixel, dpixel;
unsigned x, y;
int c_o;
if(o==0) return;
if(o==256){
combineWithTrans(sx, sy, w, h, dx, dy);
return;
}
XGetGeometry(display, wmgen.pixmap, &baz, &foo, &foo, &ww, &hh, &bar, &bar);
pix=XGetImage(display, wmgen.pixmap, 0, 0, ww, hh, AllPlanes, ZPixmap);
XGetGeometry(display, wmgen.mask, &baz, &foo, &foo, &ww, &hh, &bar, &bar);
mask=XGetImage(display, wmgen.mask, 0, 0, ww, hh, AllPlanes, ZPixmap);
if (pix->depth == DefaultDepth(display, screen)) {{
Visual *visual=DefaultVisual(display, screen);
rmask = visual->red_mask;
gmask = visual->green_mask;
bmask = visual->blue_mask;
}} else {
rmask = pix->red_mask;
gmask = pix->green_mask;
bmask = pix->blue_mask;
}
c_o=256-o;
rshift=get_shift(rmask);
gshift=get_shift(gmask);
bshift=get_shift(bmask);
/* NOTE: >>s then <<s to prevent overflow when multiplying opacity */
#define AVG(m, s) ((((((spixel&m)>>s)*o+((dpixel&m)>>s)*c_o)>>8)<<s)&m)
for(y=0; y<h; y++){
for(x=0; x<w; x++){
if(!XGetPixel(mask, sx+x, sy+y)) continue;
spixel=XGetPixel(pix, sx+x, sy+y);
if(!XGetPixel(mask, dx+x, dy+y)){
XPutPixel(pix, dx+x, dy+y, spixel);
} else {
dpixel=XGetPixel(pix, dx+x, dy+y);
XPutPixel(pix, dx+x, dy+y,
AVG(rmask, rshift) |
AVG(gmask, gshift) |
AVG(bmask, bshift));
}
}
}
#undef AVG
XPutImage(display, wmgen.pixmap, NormalGC, pix, 0, 0, 0, 0, pix->width, pix->height);
XDestroyImage(pix);
XDestroyImage(mask);
}