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/*
* buzzsaver.c
*
* Created 2019-01-16 by James Magahern <james@magahern.com>
*/
#include <cairo/cairo.h>
#include <cairo-xlib.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
int __width, __height;
static Window __window = { 0 };
static Display *__display = NULL;
static const double kLogoBackgroundWidth = 300.0;
typedef struct {
cairo_t *ctx;
double cursor_opacity;
double cursor_fade_direction;
} saver_state_t;
int poll_events(Display *display, Window window)
{
const bool block_for_next_event = false;
char keybuf[8];
KeySym key;
XEvent e;
for (;;) {
if (block_for_next_event || XPending(display)) {
// XNextEvent blocks the caller until an event arrives
XNextEvent(display, &e);
} else {
return 0;
}
// TODO: listen for window resize events and resize cairo surface
switch (e.type) {
case ButtonPress:
return -e.xbutton.button;
case KeyPress:
XLookupString(&e.xkey, keybuf, sizeof(keybuf), &key, NULL);
return key;
default:
fprintf(stderr, "Dropping unhandled XEevent.type = %d.\n", e.type);
}
}
}
/*
* Scene specific stuff
*/
void draw_logo(saver_state_t *state)
{
cairo_t *cr = state->ctx;
cairo_set_source_rgb(cr, (208.0 / 255.0), (69.0 / 255.0), (255.0 / 255.0));
cairo_rectangle(cr, 0, 0, kLogoBackgroundWidth, __height);
cairo_fill(cr);
}
void draw_password_field(saver_state_t *state)
{
cairo_t *cr = state->ctx;
cairo_set_source_rgba(cr, 1.0, 1.0, 1.0, state->cursor_opacity);
const double cursor_height = 50.0;
const double cursor_width = 30.0;
cairo_rectangle(cr, kLogoBackgroundWidth + 50.0, (__height - cursor_height) / 2.0, cursor_width, cursor_height);
cairo_fill(cr);
}
/*
* Main drawing/update routines
*/
void update(saver_state_t *state)
{
const double cursor_fade_speed = 0.007;
if (state->cursor_fade_direction > 0) {
state->cursor_opacity += cursor_fade_speed;
if (state->cursor_opacity > 1.0) {
state->cursor_fade_direction *= -1;
}
} else {
state->cursor_opacity -= cursor_fade_speed;
if (state->cursor_opacity <= 0.0) {
state->cursor_fade_direction *= -1;
}
}
poll_events(__display, __window);
}
void draw(saver_state_t *state)
{
// Draw background
cairo_t *cr = state->ctx;
cairo_set_source_rgba(cr, 0.0, 0.0, 0.0, 1.0);
cairo_paint(cr);
draw_logo(state);
draw_password_field(state);
}
int runloop(cairo_surface_t *surface)
{
cairo_t *cr = cairo_create(surface);
saver_state_t state = { 0 };
state.ctx = cr;
state.cursor_opacity = 1.0;
state.cursor_fade_direction = -1.0;
// Main run loop
struct timespec sleep_time = { 0, 5000000 };
for (;;) {
update(&state);
cairo_push_group(cr);
draw(&state);
cairo_pop_group_to_source(cr);
cairo_paint(cr);
cairo_surface_flush(surface);
nanosleep(&sleep_time, NULL);
}
// Cleanup
cairo_destroy(cr);
return EXIT_SUCCESS;
}
int main(int argc, char **argv)
{
__width = 800;
__height = 600;
__display = XOpenDisplay(NULL);
if (__display == NULL) {
fprintf(stderr, "Error opening display\n");
exit(1);
}
Window root_window = DefaultRootWindow(__display);
__window = XCreateSimpleWindow(
__display, // display
root_window, // parent window
0, 0, // x, y
__width, // width
__height, // height
0, // border_width
0, // border
0 // background
);
// Enable key events
XSelectInput(__display, __window, ButtonPressMask | KeyPressMask | StructureNotifyMask);
// Map window to display
XMapWindow(__display, __window);
// Create cairo surface
int screen = DefaultScreen(__display);
Visual *visual = DefaultVisual(__display, screen);
cairo_surface_t *surface = cairo_xlib_surface_create(
__display,
__window,
visual,
__width,
__height
);
if (surface == NULL) {
fprintf(stderr, "Error creating cairo surface\n");
exit(1);
}
// Docs say this must be called whenever the size of the window changes
cairo_xlib_surface_set_size(surface, __width, __height);
int result = runloop(surface);
cairo_surface_destroy(surface);
XCloseDisplay(__display);
return result;
}
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