1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
|
/*
* buzzsaver.c
*
* Created 2019-01-16 by James Magahern <james@magahern.com>
*/
#include <cairo/cairo.h>
#include <cairo-xlib.h>
#include <librsvg/rsvg.h>
#include <pango/pangocairo.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 size_t kMaxPasswordLength = 128;
static const double kLogoBackgroundWidth = 500.0;
typedef struct {
cairo_t *ctx;
cairo_surface_t *surface;
PangoLayout *pango_layout;
PangoFontDescription *status_font;
RsvgHandle *logo_svg_handle;
RsvgHandle *asterisk_svg_handle;
double cursor_opacity;
double cursor_fade_direction;
char *password_buffer;
size_t password_buffer_len;
} saver_state_t;
void window_changed_size(saver_state_t *state, XConfigureEvent *event)
{
__width = event->width;
__height = event->height;
cairo_xlib_surface_set_size(state->surface, __width, __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;
}
/*
* Scene specific stuff
*/
void draw_logo(saver_state_t *state)
{
if (state->logo_svg_handle == NULL) {
GError *error = NULL;
state->logo_svg_handle = rsvg_handle_new_from_file("logo.svg", &error);
if (error != NULL) {
fprintf(stderr, "Error loading logo SVG\n");
return;
}
}
cairo_t *cr = state->ctx;
cairo_save(cr);
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);
cairo_set_source_rgb(cr, 0.0, 0.0, 0.0);
// Scale and draw logo
RsvgDimensionData dimensions;
rsvg_handle_get_dimensions(state->logo_svg_handle, &dimensions);
const double padding = 100.0;
double scale_factor = ((kLogoBackgroundWidth - (padding * 2.0)) / dimensions.width);
double scaled_height = (dimensions.height * scale_factor);
double y_position = (__height - scaled_height) / 2.0;
cairo_translate(cr, padding, y_position);
cairo_scale(cr, scale_factor, scale_factor);
rsvg_handle_render_cairo(state->logo_svg_handle, cr);
cairo_restore(cr);
}
void draw_password_field(saver_state_t *state)
{
const double cursor_height = 40.0;
const double cursor_width = 30.0;
const double field_x = kLogoBackgroundWidth + 50.0;
const double field_y = (__height - cursor_height) / 2.0;
const double field_padding = 10.0;
cairo_t *cr = state->ctx;
// Draw status text
cairo_set_source_rgba(cr, 1.0, 1.0, 1.0, 1.0);
pango_layout_set_font_description(state->pango_layout, state->status_font);
pango_layout_set_text(state->pango_layout, "Password: ", -1);
int t_width, t_height;
pango_layout_get_size(state->pango_layout, &t_width, &t_height);
double line_height = t_height / PANGO_SCALE;
cairo_move_to(cr, field_x, field_y - line_height - field_padding);
pango_cairo_show_layout(cr, state->pango_layout);
// Draw password asterisks
if (state->asterisk_svg_handle == NULL) {
GError *error = NULL;
state->asterisk_svg_handle = rsvg_handle_new_from_file("asterisk.svg", &error);
if (error != NULL) {
fprintf(stderr, "Error loading asterisk SVG\n");
return;
}
}
const double cursor_padding_x = 10.0;
double cursor_offset_x = 0.0;
RsvgDimensionData dimensions;
rsvg_handle_get_dimensions(state->asterisk_svg_handle, &dimensions);
double asterisk_height = cursor_height - 20.0;
double scale_factor = (asterisk_height / dimensions.height);
double scaled_width = (dimensions.width * scale_factor);
for (unsigned i = 0; i < strlen(state->password_buffer); i++) {
cairo_save(cr);
cairo_translate(cr, field_x + cursor_offset_x, field_y + ((cursor_height - asterisk_height) / 2.0));
cairo_scale(cr, scale_factor, scale_factor);
rsvg_handle_render_cairo(state->asterisk_svg_handle, cr);
cairo_restore(cr);
cursor_offset_x += scaled_width + cursor_padding_x;
}
// Draw cursor
cairo_set_source_rgba(cr, 1.0, 1.0, 1.0, state->cursor_opacity);
cairo_rectangle(cr, field_x + cursor_offset_x, field_y, 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(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)
{
__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;
}
|