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/*
* Copyright (C) 2001-2002 Bart Massey and Jamey Sharp.
* All Rights Reserved. See the file COPYING in this directory
* for licensing information.
*/
#include <xcb/xcb.h>
#include <xcb/xcb_aux.h>
#include "reply_formats.h"
#include <math.h>
#include <stdlib.h> /* for free(3) */
#include <unistd.h> /* for usleep(3) */
#include <stdio.h>
#include <pthread.h>
#define LAG 0.3 /* lag angle for the follow line */
/* If I've done my math right, Linux maxes out at 100 fps on Intel (1000 fps
* on Alpha) due to the granularity of the kernel timer. */
#define FRAME_RATE 10.0 /* frames per second */
#define PI 3.14159265
static xcb_connection_t *c;
static xcb_screen_t *root;
static xcb_gcontext_t white, black;
static int depth;
#define WINS 8
static struct {
xcb_drawable_t w;
xcb_drawable_t p;
uint16_t width;
uint16_t height;
float angv;
} windows[WINS];
void *run(void *param);
void *event_thread(void *param);
static void get_depth()
{
xcb_drawable_t drawable = { root->root };
xcb_get_geometry_reply_t *geom;
geom = xcb_get_geometry_reply(c, xcb_get_geometry(c, drawable), 0);
if(!geom)
{
perror("GetGeometry(root) failed");
abort();
}
depth = geom->depth;
fprintf(stderr, "Root 0x%x: %dx%dx%d\n",
root->root, geom->width, geom->height, geom->depth);
free(geom);
}
int main()
{
pthread_t thr;
int i;
uint32_t mask = XCB_GC_FOREGROUND | XCB_GC_GRAPHICS_EXPOSURES;
uint32_t values[2];
xcb_drawable_t rootwin;
int screen_num;
c = xcb_connect(0, &screen_num);
root = xcb_aux_get_screen(c, screen_num);
get_depth();
rootwin = root->root;
white = xcb_generate_id(c);
black = xcb_generate_id(c);
pthread_create(&thr, 0, event_thread, 0);
values[1] = 0; /* no graphics exposures */
values[0] = root->white_pixel;
xcb_create_gc(c, white, rootwin, mask, values);
values[0] = root->black_pixel;
xcb_create_gc(c, black, rootwin, mask, values);
for(i = 1; i < WINS; ++i)
pthread_create(&thr, 0, run, (void*)i);
run((void*)0);
exit(0);
/*NOTREACHED*/
}
void *run(void *param)
{
int idx = (int)param;
int xo, yo;
double r, theta = 0;
xcb_point_t line[2];
windows[idx].w = xcb_generate_id(c);
windows[idx].p = xcb_generate_id(c);
windows[idx].width = 300;
line[0].x = xo = windows[idx].width / 2;
windows[idx].height = 300;
line[0].y = yo = windows[idx].height / 2;
windows[idx].angv = 0.05;
{
int ws = windows[idx].width * windows[idx].width;
int hs = windows[idx].height * windows[idx].height;
r = sqrt(ws + hs) + 1.0;
}
{
uint32_t mask = XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK | XCB_CW_DONT_PROPAGATE;
uint32_t values[3];
xcb_rectangle_t rect = { 0, 0, windows[idx].width, windows[idx].height };
values[0] = root->white_pixel;
values[1] = XCB_EVENT_MASK_BUTTON_RELEASE | XCB_EVENT_MASK_EXPOSURE;
values[2] = XCB_EVENT_MASK_BUTTON_PRESS;
xcb_create_window(c, depth, windows[idx].w, root->root,
/* x */ 0, /* y */ 0,
windows[idx].width, windows[idx].height,
/* border */ 0, XCB_WINDOW_CLASS_INPUT_OUTPUT,
/* visual */ root->root_visual,
mask, values);
xcb_map_window(c, windows[idx].w);
xcb_create_pixmap(c, depth,
windows[idx].p, windows[idx].w,
windows[idx].width, windows[idx].height);
xcb_poly_fill_rectangle(c, windows[idx].p, white, 1, &rect);
}
xcb_flush(c);
while(1)
{
line[1].x = xo + r * cos(theta);
line[1].y = yo + r * sin(theta);
xcb_poly_line(c, XCB_COORD_MODE_ORIGIN, windows[idx].p, black,
2, line);
line[1].x = xo + r * cos(theta + LAG);
line[1].y = yo + r * sin(theta + LAG);
xcb_poly_line(c, XCB_COORD_MODE_ORIGIN, windows[idx].p, white,
2, line);
xcb_copy_area(c, windows[idx].p, windows[idx].w, white, 0, 0, 0, 0,
windows[idx].width, windows[idx].height);
if(xcb_flush(c) <= 0)
break;
theta += windows[idx].angv;
while(theta > 2 * PI)
theta -= 2 * PI;
while(theta < 0)
theta += 2 * PI;
usleep(1000000 / FRAME_RATE);
}
return 0;
}
int lookup_window(xcb_window_t w)
{
int i;
for(i = 0; i < WINS; ++i)
if(windows[i].w == w)
return i;
return -1;
}
void *event_thread(void *param)
{
xcb_generic_event_t *e;
int idx;
while(1)
{
e = xcb_wait_for_event(c);
if(!formatEvent(e))
return 0;
if(e->response_type == XCB_EXPOSE)
{
xcb_expose_event_t *ee = (xcb_expose_event_t *) e;
idx = lookup_window(ee->window);
if(idx == -1)
fprintf(stderr, "Expose on unknown window!\n");
else
{
xcb_copy_area(c, windows[idx].p, windows[idx].w,
white, ee->x, ee->y, ee->x, ee->y,
ee->width, ee->height);
if(ee->count == 0)
xcb_flush(c);
}
}
else if(e->response_type == XCB_BUTTON_RELEASE)
{
xcb_button_release_event_t *bre = (xcb_button_release_event_t *) e;
idx = lookup_window(bre->event);
if(idx == -1)
fprintf(stderr, "ButtonRelease on unknown window!\n");
else
{
if(bre->detail == XCB_BUTTON_INDEX_1)
windows[idx].angv = -windows[idx].angv;
else if(bre->detail == XCB_BUTTON_INDEX_4)
windows[idx].angv += 0.001;
else if(bre->detail == XCB_BUTTON_INDEX_5)
windows[idx].angv -= 0.001;
}
}
free(e);
}
}
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