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/*
* buzzsaver.c
*
* Created 2019-01-16 by James Magahern <james@magahern.com>
*/
#include "render.h"
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
static Window __window = { 0 };
static Display *__display = NULL;
static const size_t kMaxPasswordLength = 128;
void window_changed_size(saver_state_t *state, XConfigureEvent *event)
{
state->canvas_width = event->width;
state->canvas_height = event->height;
cairo_xlib_surface_set_size(state->surface, event->width, event->height);
}
void handle_key_event(saver_state_t *state, XKeyEvent *event)
{
KeySym key;
char keybuf[8];
XLookupString(event, keybuf, sizeof(keybuf), &key, NULL);
char *password_buf = state->password_buffer;
size_t length = strlen(password_buf);
if (XK_BackSpace == key) {
// delete char
if (length > 0) {
password_buf[length - 1] = '\0';
}
} else if (strlen(keybuf) > 0) {
size_t add_len = strlen(keybuf);
if ( (length + add_len) < state->password_buffer_len - 1 ) {
strncpy(password_buf + length, keybuf, add_len);
}
}
}
int poll_events(saver_state_t *state)
{
const bool block_for_next_event = false;
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 ConfigureNotify:
window_changed_size(state, (XConfigureEvent *)&e);
return 1;
case ButtonPress:
return -e.xbutton.button;
case KeyPress:
handle_key_event(state, (XKeyEvent *)&e);
return 1;
default:
fprintf(stderr, "Dropping unhandled XEevent.type = %d.\n", e.type);
}
}
return 0;
}
/*
* 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(state);
}
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);
// Initialize pango context
PangoLayout *pango_layout = pango_cairo_create_layout(cr);
PangoFontDescription *status_font = pango_font_description_from_string("Input Mono 22");
saver_state_t state = { 0 };
state.ctx = cr;
state.surface = surface;
state.cursor_opacity = 1.0;
state.cursor_fade_direction = -1.0;
state.pango_layout = pango_layout;
state.status_font = status_font;
state.password_buffer = calloc(1, kMaxPasswordLength);
state.password_buffer_len = kMaxPasswordLength;
// 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)
{
int default_width = 800;
int default_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
default_width, // width
default_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,
default_width,
default_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, default_width, default_height);
int result = runloop(surface);
cairo_surface_destroy(surface);
XCloseDisplay(__display);
return result;
}
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