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