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/*
* buzzsaver.c
*
* Created 2019-01-16 by James Magahern <james@magahern.com>
*/
#include "render.h"
#include "x11_support.h"
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
static const size_t kMaxPasswordLength = 128;
static void accept_password(saver_state_t *state);
/*
* Event handling
*/
static 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);
}
static 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 (XK_Return == key) {
accept_password(state);
} 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);
}
}
}
static int poll_events(saver_state_t *state)
{
XEvent e;
const bool block_for_next_event = false;
// Temp: this should be handled by x11_support
Display *display = cairo_xlib_surface_get_display(state->surface);
for (;;) {
if (block_for_next_event || XPending(display)) {
// XNextEvent blocks the caller until an event arrives
XNextEvent(display, &e);
} else {
return 0;
}
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;
}
/*
* Actions
*/
static void accept_password(saver_state_t *state)
{
state->cursor_animating = false;
}
/*
* Main drawing/update routines
*/
static void update(saver_state_t *state)
{
if (state->cursor_animating) {
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;
}
}
} else {
state->cursor_opacity = 1.0;
}
poll_events(state);
}
static 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);
}
static 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;
state.cursor_animating = true;
// 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;
cairo_surface_t *surface = x11_helper_acquire_cairo_surface(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);
x11_helper_destroy_surface(surface);
return result;
}
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