ref: 2d221e61e3820a007ff2204adb73ad3ab27010c6
dir: /sys/src/cmd/vnc/screen.c/
#include <u.h>
#include <libc.h>
#include "compat.h"
#include "kbd.h"
#include "error.h"
#define Image IMAGE
#include <draw.h>
#include <memdraw.h>
#include <cursor.h>
#include "screen.h"
enum
{
CURSORDIM = 16
};
Memimage *gscreen;
Point ZP;
int cursorver;
Point cursorpos;
static Memimage *back;
static Memimage *conscol;
static Memimage *curscol;
static Point curpos;
static Memsubfont *memdefont;
static Rectangle flushr;
static Rectangle window;
static int h;
static int w;
static Rectangle cursorr;
static Point offscreen;
static uchar cursset[CURSORDIM*CURSORDIM/8];
static uchar cursclr[CURSORDIM*CURSORDIM/8];
static int cursdrawvers = -1;
static Memimage *cursorset;
static Memimage *cursorclear;
static Cursor screencursor;
void
screeninit(int x, int y, char *chanstr)
{
char buf[128];
Rectangle r;
int chan;
cursorver = 0;
memimageinit();
chan = strtochan(chanstr);
if(chan == 0)
error("bad screen channel string");
r = Rect(0, 0, x, y);
gscreen = allocmemimage(r, chan);
if(gscreen == nil){
snprint(buf, sizeof buf, "can't allocate screen image: %r");
error(buf);
}
offscreen = Pt(x + 100, y + 100);
cursorr = Rect(0, 0, CURSORDIM, CURSORDIM);
cursorset = allocmemimage(cursorr, GREY8);
cursorclear = allocmemimage(cursorr, GREY1);
if(cursorset == nil || cursorclear == nil){
freememimage(gscreen);
freememimage(cursorset);
freememimage(cursorclear);
gscreen = nil;
cursorset = nil;
cursorclear = nil;
snprint(buf, sizeof buf, "can't allocate cursor images: %r");
error(buf);
}
/* a lot of work to get a grey color */
curscol = allocmemimage(Rect(0,0,1,1), RGBA32);
curscol->flags |= Frepl;
curscol->clipr = gscreen->r;
memfillcolor(curscol, 0xff0000ff);
screenwin();
setcursor(&arrow);
}
void
screenwin(void)
{
Point p;
char *greet;
Memimage *grey;
qlock(&drawlock);
back = memwhite;
conscol = memblack;
memfillcolor(gscreen, 0x888844FF);
memdefont = getmemdefont();
h = memdefont->height;
window = insetrect(gscreen->clipr, 20);
memimagedraw(gscreen, window, memblack, ZP, memopaque, ZP, S);
window = insetrect(window, 4);
memimagedraw(gscreen, window, memwhite, ZP, memopaque, ZP, S);
/* a lot of work to get a grey color */
grey = allocmemimage(Rect(0,0,1,1), CMAP8);
grey->flags |= Frepl;
grey->clipr = gscreen->r;
memfillcolor(grey, 0xAAAAAAFF);
memimagedraw(gscreen, Rect(window.min.x, window.min.y,
window.max.x, window.min.y+h+5+6), grey, ZP, nil, ZP, S);
freememimage(grey);
window = insetrect(window, 5);
greet = " Plan 9 Console ";
p = addpt(window.min, Pt(10, 0));
memimagestring(gscreen, p, conscol, ZP, memdefont, greet);
window.min.y += h+6;
curpos = window.min;
window.max.y = window.min.y+((window.max.y-window.min.y)/h)*h;
flushmemscreen(gscreen->r);
qunlock(&drawlock);
}
uchar*
attachscreen(Rectangle* r, ulong* chan, int* d, int* width, int *softscreen)
{
*r = gscreen->clipr;
*d = gscreen->depth;
*chan = gscreen->chan;
*width = gscreen->width;
*softscreen = 1;
return gscreen->data->bdata;
}
void
getcolor(ulong , ulong* pr, ulong* pg, ulong* pb)
{
*pr = 0;
*pg = 0;
*pb = 0;
}
int
setcolor(ulong , ulong , ulong , ulong )
{
return 0;
}
/*
* called with cursor unlocked, drawlock locked
*/
void
cursordraw(Memimage *dst, Rectangle r)
{
static uchar set[CURSORDIM*CURSORDIM], clr[CURSORDIM*CURSORDIM/8];
static int ver = -1;
int i, j, n;
lock(&cursor);
if(ver != cursorver){
n = 0;
for(i = 0; i < CURSORDIM*CURSORDIM/8; i += CURSORDIM/8){
for(j = 0; j < CURSORDIM; j++){
if(cursset[i + (j >> 3)] & (1 << (7 - (j & 7))))
set[n] = 0xaa;
else
set[n] = 0;
n++;
}
}
memmove(clr, cursclr, CURSORDIM*CURSORDIM/8);
ver = cursorver;
unlock(&cursor);
loadmemimage(cursorset, cursorr, set, CURSORDIM*CURSORDIM);
loadmemimage(cursorclear, cursorr, clr, CURSORDIM*CURSORDIM/8);
}else
unlock(&cursor);
memimagedraw(dst, r, memwhite, ZP, cursorclear, ZP, SoverD);
memimagedraw(dst, r, curscol, ZP, cursorset, ZP, SoverD);
}
/*
* called with cursor locked, drawlock possibly unlocked
*/
Rectangle
cursorrect(void)
{
Rectangle r;
r.min.x = cursorpos.x + cursor.offset.x;
r.min.y = cursorpos.y + cursor.offset.y;
r.max.x = r.min.x + CURSORDIM;
r.max.y = r.min.y + CURSORDIM;
return r;
}
/*
* called with cursor locked, drawlock possibly unlocked
*/
void
setcursor(Cursor* curs)
{
cursorver++;
memmove(cursset, curs->set, CURSORDIM*CURSORDIM/8);
memmove(cursclr, curs->clr, CURSORDIM*CURSORDIM/8);
}
void
cursoron(void)
{
cursorpos = mousexy();
}
void
cursoroff(void)
{
cursorpos = offscreen;
}
void
blankscreen(int blank)
{
USED(blank);
}
static void
screenflush(void)
{
flushmemscreen(flushr);
flushr = Rect(10000, 10000, -10000, -10000);
}
static void
addflush(Rectangle r)
{
if(flushr.min.x >= flushr.max.x)
flushr = r;
else
combinerect(&flushr, r);
}
static void
scroll(void)
{
int o;
Point p;
Rectangle r;
o = 8*h;
r = Rpt(window.min, Pt(window.max.x, window.max.y-o));
p = Pt(window.min.x, window.min.y+o);
memimagedraw(gscreen, r, gscreen, p, nil, p, S);
r = Rpt(Pt(window.min.x, window.max.y-o), window.max);
memimagedraw(gscreen, r, back, ZP, nil, ZP, S);
flushmemscreen(gscreen->clipr);
curpos.y -= o;
}
static void
screenputc(char *buf)
{
Point p;
int w, pos;
Rectangle r;
static int *xp;
static int xbuf[256];
if(xp < xbuf || xp >= &xbuf[sizeof(xbuf)])
xp = xbuf;
switch(buf[0]){
case '\n':
if(curpos.y+h >= window.max.y)
scroll();
curpos.y += h;
screenputc("\r");
break;
case '\r':
xp = xbuf;
curpos.x = window.min.x;
break;
case '\t':
p = memsubfontwidth(memdefont, " ");
w = p.x;
*xp++ = curpos.x;
pos = (curpos.x-window.min.x)/w;
pos = 8-(pos%8);
r = Rect(curpos.x, curpos.y, curpos.x+pos*w, curpos.y + h);
memimagedraw(gscreen, r, back, back->r.min, memopaque, ZP, S);
addflush(r);
curpos.x += pos*w;
break;
case '\b':
if(xp <= xbuf)
break;
xp--;
r = Rect(*xp, curpos.y, curpos.x, curpos.y + h);
memimagedraw(gscreen, r, back, back->r.min, memopaque, ZP, S);
addflush(r);
curpos.x = *xp;
break;
case '\0':
break;
default:
p = memsubfontwidth(memdefont, buf);
w = p.x;
if(curpos.x >= window.max.x-w)
screenputc("\n");
*xp++ = curpos.x;
r = Rect(curpos.x, curpos.y, curpos.x+w, curpos.y + h);
memimagedraw(gscreen, r, back, back->r.min, memopaque, ZP, S);
memimagestring(gscreen, curpos, conscol, ZP, memdefont, buf);
addflush(r);
curpos.x += w;
}
}
void
screenputs(char *s, int n)
{
static char rb[UTFmax+1];
static int nrb;
char *e;
qlock(&drawlock);
e = s + n;
while(s < e){
rb[nrb++] = *s++;
if(nrb >= UTFmax || fullrune(rb, nrb)){
rb[nrb] = 0;
screenputc(rb);
nrb = 0;
}
}
screenflush();
qunlock(&drawlock);
}