1 /*
2 * Copyright (C) 2007 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "framebuffer_service.h"
18
19 #include <errno.h>
20 #include <fcntl.h>
21 #include <linux/fb.h>
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <string.h>
25 #include <sys/ioctl.h>
26 #include <sys/mman.h>
27 #include <sys/types.h>
28 #include <sys/wait.h>
29 #include <unistd.h>
30
31 #include "sysdeps.h"
32
33 #include "adb.h"
34 #include "adb_io.h"
35 #include "adb_utils.h"
36
37 /* TODO:
38 ** - sync with vsync to avoid tearing
39 */
40 /* This version number defines the format of the fbinfo struct.
41 It must match versioning in ddms where this data is consumed. */
42 #define DDMS_RAWIMAGE_VERSION 2
43 struct fbinfo {
44 unsigned int version;
45 unsigned int bpp;
46 unsigned int colorSpace;
47 unsigned int size;
48 unsigned int width;
49 unsigned int height;
50 unsigned int red_offset;
51 unsigned int red_length;
52 unsigned int blue_offset;
53 unsigned int blue_length;
54 unsigned int green_offset;
55 unsigned int green_length;
56 unsigned int alpha_offset;
57 unsigned int alpha_length;
58 } __attribute__((packed));
59
framebuffer_service(unique_fd fd)60 void framebuffer_service(unique_fd fd) {
61 struct fbinfo fbinfo;
62 unsigned int i, bsize;
63 char buf[640];
64 int fd_screencap;
65 int w, h, f, c;
66 int fds[2];
67 pid_t pid;
68
69 if (pipe2(fds, O_CLOEXEC) < 0) return;
70
71 pid = fork();
72 if (pid < 0) goto done;
73
74 if (pid == 0) {
75 dup2(fds[1], STDOUT_FILENO);
76 adb_close(fds[0]);
77 adb_close(fds[1]);
78 const char* command = "screencap";
79 const char *args[2] = {command, nullptr};
80 execvp(command, (char**)args);
81 perror_exit("exec screencap failed");
82 }
83
84 adb_close(fds[1]);
85 fd_screencap = fds[0];
86
87 /* read w, h, format & color space */
88 if(!ReadFdExactly(fd_screencap, &w, 4)) goto done;
89 if(!ReadFdExactly(fd_screencap, &h, 4)) goto done;
90 if(!ReadFdExactly(fd_screencap, &f, 4)) goto done;
91 if(!ReadFdExactly(fd_screencap, &c, 4)) goto done;
92
93 fbinfo.version = DDMS_RAWIMAGE_VERSION;
94 fbinfo.colorSpace = c;
95 /* see hardware/hardware.h */
96 switch (f) {
97 case 1: /* RGBA_8888 */
98 fbinfo.bpp = 32;
99 fbinfo.size = w * h * 4;
100 fbinfo.width = w;
101 fbinfo.height = h;
102 fbinfo.red_offset = 0;
103 fbinfo.red_length = 8;
104 fbinfo.green_offset = 8;
105 fbinfo.green_length = 8;
106 fbinfo.blue_offset = 16;
107 fbinfo.blue_length = 8;
108 fbinfo.alpha_offset = 24;
109 fbinfo.alpha_length = 8;
110 break;
111 case 2: /* RGBX_8888 */
112 fbinfo.bpp = 32;
113 fbinfo.size = w * h * 4;
114 fbinfo.width = w;
115 fbinfo.height = h;
116 fbinfo.red_offset = 0;
117 fbinfo.red_length = 8;
118 fbinfo.green_offset = 8;
119 fbinfo.green_length = 8;
120 fbinfo.blue_offset = 16;
121 fbinfo.blue_length = 8;
122 fbinfo.alpha_offset = 24;
123 fbinfo.alpha_length = 0;
124 break;
125 case 3: /* RGB_888 */
126 fbinfo.bpp = 24;
127 fbinfo.size = w * h * 3;
128 fbinfo.width = w;
129 fbinfo.height = h;
130 fbinfo.red_offset = 0;
131 fbinfo.red_length = 8;
132 fbinfo.green_offset = 8;
133 fbinfo.green_length = 8;
134 fbinfo.blue_offset = 16;
135 fbinfo.blue_length = 8;
136 fbinfo.alpha_offset = 24;
137 fbinfo.alpha_length = 0;
138 break;
139 case 4: /* RGB_565 */
140 fbinfo.bpp = 16;
141 fbinfo.size = w * h * 2;
142 fbinfo.width = w;
143 fbinfo.height = h;
144 fbinfo.red_offset = 11;
145 fbinfo.red_length = 5;
146 fbinfo.green_offset = 5;
147 fbinfo.green_length = 6;
148 fbinfo.blue_offset = 0;
149 fbinfo.blue_length = 5;
150 fbinfo.alpha_offset = 0;
151 fbinfo.alpha_length = 0;
152 break;
153 case 5: /* BGRA_8888 */
154 fbinfo.bpp = 32;
155 fbinfo.size = w * h * 4;
156 fbinfo.width = w;
157 fbinfo.height = h;
158 fbinfo.red_offset = 16;
159 fbinfo.red_length = 8;
160 fbinfo.green_offset = 8;
161 fbinfo.green_length = 8;
162 fbinfo.blue_offset = 0;
163 fbinfo.blue_length = 8;
164 fbinfo.alpha_offset = 24;
165 fbinfo.alpha_length = 8;
166 break;
167 default:
168 goto done;
169 }
170
171 /* write header */
172 if (!WriteFdExactly(fd.get(), &fbinfo, sizeof(fbinfo))) goto done;
173
174 /* write data */
175 for(i = 0; i < fbinfo.size; i += bsize) {
176 bsize = sizeof(buf);
177 if (i + bsize > fbinfo.size)
178 bsize = fbinfo.size - i;
179 if(!ReadFdExactly(fd_screencap, buf, bsize)) goto done;
180 if (!WriteFdExactly(fd.get(), buf, bsize)) goto done;
181 }
182
183 done:
184 adb_close(fds[0]);
185
186 TEMP_FAILURE_RETRY(waitpid(pid, nullptr, 0));
187 }
188