cursor.c revision baaff307 
1/*
2 * DRM based mode setting test program
3 * Copyright (C) 2013 Red Hat
4 * Author: Rob Clark <robdclark@gmail.com>
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
22 * IN THE SOFTWARE.
23 */
24
25#ifdef HAVE_CONFIG_H
26#include "config.h"
27#endif
28
29#include <assert.h>
30#include <errno.h>
31#include <stdio.h>
32#include <stdlib.h>
33#include <stdint.h>
34#include <string.h>
35#include <signal.h>
36#include <sys/time.h>
37
38#include "xf86drm.h"
39#include "xf86drmMode.h"
40
41#include "buffers.h"
42#include "cursor.h"
43
44#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
45
46struct cursor {
47	int fd;
48	uint32_t bo_handle;
49	uint32_t crtc_id;
50	uint32_t crtc_w, crtc_h;
51	uint32_t w, h;
52
53	/* current state */
54	uint32_t enabled, x, y;
55	int32_t dx, dy;
56};
57
58#define MAX_CURSORS 8
59static struct cursor cursors[MAX_CURSORS];
60static int ncursors;
61
62/*
63 * Timer driven program loops through these steps to move/enable/disable
64 * the cursor
65 */
66
67struct cursor_step {
68	void (*run)(struct cursor *cursor, struct cursor_step *step);
69	uint32_t msec;
70	uint32_t repeat;
71	int arg;
72};
73
74static uint32_t indx, count;
75
76static void set_cursor(struct cursor *cursor, struct cursor_step *step)
77{
78	int enabled = (step->arg ^ count) & 0x1;
79	uint32_t handle = 0;
80
81	if (enabled)
82		handle = cursor->bo_handle;
83
84	cursor->enabled = enabled;
85
86	drmModeSetCursor(cursor->fd, cursor->crtc_id, handle, cursor->w, cursor->h);
87}
88
89static void move_cursor(struct cursor *cursor, struct cursor_step *step)
90{
91	int x = cursor->x;
92	int y = cursor->y;
93
94	if (!cursor->enabled)
95		drmModeSetCursor(cursor->fd, cursor->crtc_id,
96				cursor->bo_handle, cursor->w, cursor->h);
97
98	/* calculate new cursor position: */
99	x += cursor->dx * step->arg;
100	y += cursor->dy * step->arg;
101
102	if (x < 0) {
103		x = 0;
104		cursor->dx = 1;
105	} else if (x > (int)cursor->crtc_w) {
106		x = cursor->crtc_w - 1;
107		cursor->dx = -1;
108	}
109
110	if (y < 0) {
111		y = 0;
112		cursor->dy = 1;
113	} else if (y > (int)cursor->crtc_h) {
114		y = cursor->crtc_h - 1;
115		cursor->dy = -1;
116	}
117
118	cursor->x = x;
119	cursor->y = y;
120
121	drmModeMoveCursor(cursor->fd, cursor->crtc_id, x, y);
122}
123
124static struct cursor_step steps[] = {
125		{  set_cursor, 10,   0,  1 },  /* enable */
126		{ move_cursor,  1, 100,  1 },
127		{ move_cursor,  1,  10, 10 },
128		{  set_cursor,  1, 100,  0 },  /* disable/enable loop */
129		{ move_cursor,  1,  10, 10 },
130		{ move_cursor,  9, 100,  1 },
131		{ move_cursor, 11, 100,  5 },
132		{  set_cursor, 17,  10,  0 },  /* disable/enable loop */
133		{ move_cursor,  9, 100,  1 },
134		{  set_cursor, 13,  10,  0 },  /* disable/enable loop */
135		{ move_cursor,  9, 100,  1 },
136		{  set_cursor, 13,  10,  0 },  /* disable/enable loop */
137		{  set_cursor, 10,   0,  0 },  /* disable */
138};
139
140/*
141 * Cursor API:
142 */
143
144static void run_step(int sig)
145{
146	struct cursor_step *step = &steps[indx % ARRAY_SIZE(steps)];
147	struct itimerval itimer = {
148			.it_value.tv_usec = 1000 * step->msec,
149	};
150	int i;
151
152	for (i = 0; i < ncursors; i++) {
153		struct cursor *cursor = &cursors[i];
154		step->run(cursor, step);
155	}
156
157	/* iterate to next count/step: */
158	if (count < step->repeat) {
159		count++;
160	} else {
161		count = 0;
162		indx++;
163	}
164
165	/* and lastly, setup timer for next step */
166	setitimer(ITIMER_REAL, &itimer, NULL);
167}
168
169int cursor_init(int fd, uint32_t bo_handle, uint32_t crtc_id,
170		uint32_t crtc_w, uint32_t crtc_h, uint32_t w, uint32_t h)
171{
172	struct cursor *cursor = &cursors[ncursors];
173
174	assert(ncursors < MAX_CURSORS);
175
176	cursor->fd = fd;
177	cursor->bo_handle = bo_handle;
178	cursor->crtc_id = crtc_id;
179	cursor->crtc_w = crtc_w;
180	cursor->crtc_h = crtc_h;
181	cursor->w = w;
182	cursor->h = h;
183
184	cursor->enabled = 0;
185	cursor->x = w/2;
186	cursor->y = h/2;
187	cursor->dx = 1;
188	cursor->dy = 1;
189
190	ncursors++;
191
192	return 0;
193}
194
195int cursor_start(void)
196{
197	/* setup signal handler to update cursor: */
198	signal(SIGALRM, run_step);
199	printf("starting cursor\n");
200	run_step(SIGALRM);
201	return 0;
202}
203
204int cursor_stop(void)
205{
206	signal(SIGALRM, NULL);
207	printf("cursor stopped\n");
208	return 0;
209}
210