ref: 1018d7a7091fd5e0433f501a3474cdc3fec322cc
dir: /libdraw/window.c/
#include "lib9.h" #include "draw.h" #include "kernel.h" typedef struct Memimage Memimage; static int screenid; Screen* allocscreen(Image *image, Image *fill, int public) { uchar *a; Screen *s; int id, try; Display *d; d = image->display; if(d != fill->display){ kwerrstr("allocscreen: image and fill on different displays"); return 0; } s = malloc(sizeof(Screen)); if(s == 0) return 0; SET(id); for(try=0; try<25; try++){ /* loop until find a free id */ a = bufimage(d, 1+4+4+4+1); if(a == 0){ free(s); return 0; } id = ++screenid; a[0] = 'A'; BPLONG(a+1, id); BPLONG(a+5, image->id); BPLONG(a+9, fill->id); a[13] = public; if(flushimage(d, 0) != -1) break; } s->display = d; s->id = id; s->image = image; // assert(s->image && s->image->chan != 0); s->fill = fill; return s; } Screen* publicscreen(Display *d, int id, ulong chan) { uchar *a; Screen *s; s = malloc(sizeof(Screen)); if(s == 0) return 0; a = bufimage(d, 1+4+4); if(a == 0){ Error: free(s); return 0; } a[0] = 'S'; BPLONG(a+1, id); BPLONG(a+5, chan); if(flushimage(d, 0) < 0) goto Error; s->display = d; s->id = id; s->image = 0; s->fill = 0; return s; } int freescreen(Screen *s) { uchar *a; Display *d; if(s == 0) return 0; d = s->display; a = bufimage(d, 1+4); if(a == 0) return -1; a[0] = 'F'; BPLONG(a+1, s->id); /* * flush(1) because screen is likely holding last reference to * window, and want it to disappear visually. */ if(flushimage(d, 1) < 0) return -1; free(s); return 1; } Image* allocwindow(Screen *s, Rectangle r, int ref, ulong val) { return _allocwindow(nil, s, r, ref, val); } Image* _allocwindow(Image *i, Screen *s, Rectangle r, int ref, ulong val) { Display *d; d = s->display; i = _allocimage(i, d, r, s->image->chan, 0, val, s->id, ref); if(i == 0) return 0; i->screen = s; i->next = s->display->windows; s->display->windows = i; return i; } static void topbottom(Image **w, int n, int top) { int i; uchar *b; Display *d; if(n<0 || n>(Displaybufsize-100)/4){ _drawprint(2, "top/bottom: ridiculous number of windows\n"); return; } if(n==0) return; /* check that all images are on the same display; only it can check the screens */ d = w[0]->display; for(i=1; i<n; i++) if(w[i]->display != d){ _drawprint(2, "top/bottom: windows not on same display\n"); return; } b = bufimage(d, 1+1+2+4*n); if (b == 0) { _drawprint(2, "top/bottom: no bufimage\n"); return; } b[0] = 't'; b[1] = top; BPSHORT(b+2, n); for(i=0; i<n; i++) BPLONG(b+4+4*i, w[i]->id); } void bottomwindow(Image *w) { topbottom(&w, 1, 0); } void topwindow(Image *w) { topbottom(&w, 1, 1); } void bottomnwindows(Image **w, int n) { topbottom(w, n, 0); } void topnwindows(Image **w, int n) { topbottom(w, n, 1); } int originwindow(Image *w, Point log, Point scr) { uchar *b; Point delta; flushimage(w->display, 0); b = bufimage(w->display, 1+4+2*4+2*4); if(b == nil) return 0; b[0] = 'o'; BPLONG(b+1, w->id); BPLONG(b+5, log.x); BPLONG(b+9, log.y); BPLONG(b+13, scr.x); BPLONG(b+17, scr.y); if(flushimage(w->display, 1) < 0) return -1; delta = subpt(log, w->r.min); w->r = rectaddpt(w->r, delta); w->clipr = rectaddpt(w->clipr, delta); return 1; }