Does it work in Plan9Port?
2012/12/19 erik quanstrom <quans...@quanstro.net>:
> i don't think there are any tricks. here's a pretty minimal program
> that displays colors. usage might be:
>
> color 0x448844FF 0x000055FF
>
> - erik
>
> ----
> #include <u.h>
> #include <libc.h>
> #include <thread.h>
> #include <draw.h>
> #include <mouse.h>
> #include <keyboard.h>
>
> static Mousectl *m;
> static long colors[1024];
> static Image *c[1024];
> static int ncolor;
>
> int rflag;
>
> void
> redraw(int)
> {
> int i, x, y;
> ulong chan;
>
> chan = rflag ? CHAN3(CGreen, 8, CBlue, 8, CRed, 8) : RGB24;
>
> if(c[0] == 0)
> for(i = 0; i < ncolor; i++){
> c[i] = allocimage(display, Rect(0, 0, 1, 1), chan, 1,
> colors[i]);
> if(c[i] == 0)
> sysfatal("allocimage: %r");
> }
>
> x = screen->r.min.x;
> y = screen->r.min.y;
>
> for(i = 0; i < ncolor; i++){
> draw(screen, Rect(x, y, x+48, y+48), c[i], nil, ZP);
> x += 50;
> if(x > screen->r.max.x-60){
> x = screen->r.min.x;
> y += 50;
> }
> }
> }
>
> void
> resizeproc(void *)
> {
> for(; recv(m->resizec, 0);){
> if(getwindow(display, Refnone) < 0){
> fprint(2, "test: can't reattach to window\n");
> threadexitsall("resize");
> }
> redraw(1);
> flushimage(display, 1);
> }
> }
>
> static void
> drawe(Display*, char *e)
> {
> fprint(2, "%s\n", e);
> threadexitsall("libdraw");
> }
>
> int
> init(void)
> {
> // newwindow("-dx 300 -dy 300");
> if(initdraw(drawe, 0, "test") < 0){
> fprint(2, "test: initdraw failed: %r");
> return -1;
> }
> m = initmouse(0, screen);
> return 0;
> }
>
> void
> kbdproc(void*)
> {
> Keyboardctl *k;
>
> k = initkeyboard(0);
> recv(k->c, 0);
> threadexitsall("");
> }
>
> void
> mouseproc(void*)
> {
> while(readmouse(m) >= 0)
> ;
> threadexitsall("readmouse");
> }
>
> void
> usage(void)
> {
> fprint(2, "usage: color [-r] color1 ...\n");
> threadexitsall("usage");
> }
>
> void
> threadmain(int argc, char *argv[])
> {
> ARGBEGIN{
> case 'r':
> rflag ^= rflag;
> break;
> default:
> usage();
> }ARGEND;
>
> if(argc == 0)
> usage();
>
> if(argc > nelem(colors))
> argc = nelem(colors);
>
> for(ncolor = 0; ncolor < argc; ncolor++)
> colors[ncolor] = strtoul(argv[ncolor], 0, 16);
>
> if(init() < 0)
> threadexitsall("initdraw");
>
> redraw(1);
> proccreate(kbdproc, 0, 1024);
> proccreate(mouseproc, 0, 8192);
> proccreate(resizeproc, 0, 8*8192);
> for(;;)
> sleep(10000);
> }
>
