/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ #include <u.h>#include <libc.h>#include <draw.h>#include <thread.h>#include <cursor.h>#include <mouse.h> #define	W	Borderwidth static Image *tmp[4];static Image *red; static Cursor sweep={	{-7, -7},	{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xE0, 0x07,	 0xE0, 0x07, 0xE0, 0x07, 0xE3, 0xF7, 0xE3, 0xF7,	 0xE3, 0xE7, 0xE3, 0xF7, 0xE3, 0xFF, 0xE3, 0x7F,	 0xE0, 0x3F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,},	{0x00, 0x00, 0x7F, 0xFE, 0x40, 0x02, 0x40, 0x02,	 0x40, 0x02, 0x40, 0x02, 0x40, 0x02, 0x41, 0xE2,	 0x41, 0xC2, 0x41, 0xE2, 0x41, 0x72, 0x40, 0x38,	 0x40, 0x1C, 0x40, 0x0E, 0x7F, 0xE6, 0x00, 0x00,}}; staticvoidbrects(Rectangle r, Rectangle rp[4]){	if(Dx(r) < 2*W)		r.max.x = r.min.x+2*W;	if(Dy(r) < 2*W)		r.max.y = r.min.y+2*W;	rp[0] = Rect(r.min.x, r.min.y, r.max.x, r.min.y+W);	rp[1] = Rect(r.min.x, r.max.y-W, r.max.x, r.max.y);	rp[2] = Rect(r.min.x, r.min.y+W, r.min.x+W, r.max.y-W);	rp[3] = Rect(r.max.x-W, r.min.y+W, r.max.x, r.max.y-W);} Rectanglegetrect(int but, Mousectl *mc){	Rectangle r, rc; 	but = 1<<(but-1);	setcursor(mc, &sweep);	while(mc->buttons)		readmouse(mc);	while(!(mc->buttons & but)){		readmouse(mc);		if(mc->buttons & (7^but))			goto Return;	}	r.min = mc->xy;	r.max = mc->xy;	do{		rc = canonrect(r);		drawgetrect(rc, 1);		readmouse(mc);		drawgetrect(rc, 0);		r.max = mc->xy;	}while(mc->buttons == but);     Return:	setcursor(mc, nil);	if(mc->buttons & (7^but)){		rc.min.x = rc.max.x = 0;		rc.min.y = rc.max.y = 0;		while(mc->buttons)			readmouse(mc);	}	return rc;} staticvoidfreetmp(void){	freeimage(tmp[0]);	freeimage(tmp[1]);	freeimage(tmp[2]);	freeimage(tmp[3]);	freeimage(red);	tmp[0] = tmp[1] = tmp[2] = tmp[3] = red = nil;} staticintmax(int a, int b){	if(a > b)		return a;	return b;} voiddrawgetrect(Rectangle rc, int up){	int i;	Rectangle r, rects[4]; 	/*	 * BUG: if for some reason we have two of these going on at once	 * when we must grow the tmp buffers, we lose data.  Also if tmp	 * is unallocated and we ask to restore the screen, it would be nice	 * to complain, but we silently make a mess.	 */	if(up && tmp[0]!=nil)		if(Dx(tmp[0]->r)<Dx(rc) || Dy(tmp[2]->r)<Dy(rc))			freetmp();	if(tmp[0] == 0){		r = Rect(0, 0, max(Dx(display->screenimage->r), Dx(rc)), W);		tmp[0] = allocimage(display, r, screen->chan, 0, -1);		tmp[1] = allocimage(display, r, screen->chan, 0, -1);		r = Rect(0, 0, W, max(Dy(display->screenimage->r), Dy(rc)));		tmp[2] = allocimage(display, r, screen->chan, 0, -1);		tmp[3] = allocimage(display, r, screen->chan, 0, -1);		red = allocimage(display, Rect(0,0,1,1), screen->chan, 1, DRed);		if(tmp[0]==0 || tmp[1]==0 || tmp[2]==0 || tmp[3]==0 || red==0){			freetmp();			drawerror(display, "getrect: allocimage failed");		}	}	brects(rc, rects);	if(!up){		for(i=0; i<4; i++)			draw(screen, rects[i], tmp[i], nil, ZP);		return;	}	for(i=0; i<4; i++){		draw(tmp[i], Rect(0, 0, Dx(rects[i]), Dy(rects[i])), screen, nil, rects[i].min);		draw(screen, rects[i], red, nil, ZP);	}}