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 <stdlib.h>
18 #include <stdio.h>
19 #include <unistd.h>
20 #include <string.h>
21 #include <fcntl.h>
22
23 #include "fdevent.h"
24 #include "adb.h"
25
26 #include <linux/fb.h>
27 #include <sys/ioctl.h>
28 #include <sys/mman.h>
29
30 /* TODO:
31 ** - sync with vsync to avoid tearing
32 */
33 /* This version number defines the format of the fbinfo struct.
34 It must match versioning in ddms where this data is consumed. */
35 #define DDMS_RAWIMAGE_VERSION 1
36 struct fbinfo {
37 unsigned int version;
38 unsigned int bpp;
39 unsigned int size;
40 unsigned int width;
41 unsigned int height;
42 unsigned int red_offset;
43 unsigned int red_length;
44 unsigned int blue_offset;
45 unsigned int blue_length;
46 unsigned int green_offset;
47 unsigned int green_length;
48 unsigned int alpha_offset;
49 unsigned int alpha_length;
50 } __attribute__((packed));
51
framebuffer_service(int fd,void * cookie)52 void framebuffer_service(int fd, void *cookie)
53 {
54 struct fbinfo fbinfo;
55 unsigned int i;
56 char buf[640];
57 int fd_screencap;
58 int w, h, f;
59 int fds[2];
60
61 if (pipe(fds) < 0) goto done;
62
63 pid_t pid = fork();
64 if (pid < 0) goto done;
65
66 if (pid == 0) {
67 dup2(fds[1], STDOUT_FILENO);
68 close(fds[0]);
69 close(fds[1]);
70 const char* command = "screencap";
71 const char *args[2] = {command, NULL};
72 execvp(command, (char**)args);
73 exit(1);
74 }
75
76 fd_screencap = fds[0];
77
78 /* read w, h & format */
79 if(readx(fd_screencap, &w, 4)) goto done;
80 if(readx(fd_screencap, &h, 4)) goto done;
81 if(readx(fd_screencap, &f, 4)) goto done;
82
83 fbinfo.version = DDMS_RAWIMAGE_VERSION;
84 /* see hardware/hardware.h */
85 switch (f) {
86 case 1: /* RGBA_8888 */
87 fbinfo.bpp = 32;
88 fbinfo.size = w * h * 4;
89 fbinfo.width = w;
90 fbinfo.height = h;
91 fbinfo.red_offset = 0;
92 fbinfo.red_length = 8;
93 fbinfo.green_offset = 8;
94 fbinfo.green_length = 8;
95 fbinfo.blue_offset = 16;
96 fbinfo.blue_length = 8;
97 fbinfo.alpha_offset = 24;
98 fbinfo.alpha_length = 8;
99 break;
100 case 2: /* RGBX_8888 */
101 fbinfo.bpp = 32;
102 fbinfo.size = w * h * 4;
103 fbinfo.width = w;
104 fbinfo.height = h;
105 fbinfo.red_offset = 0;
106 fbinfo.red_length = 8;
107 fbinfo.green_offset = 8;
108 fbinfo.green_length = 8;
109 fbinfo.blue_offset = 16;
110 fbinfo.blue_length = 8;
111 fbinfo.alpha_offset = 24;
112 fbinfo.alpha_length = 0;
113 break;
114 case 3: /* RGB_888 */
115 fbinfo.bpp = 24;
116 fbinfo.size = w * h * 3;
117 fbinfo.width = w;
118 fbinfo.height = h;
119 fbinfo.red_offset = 0;
120 fbinfo.red_length = 8;
121 fbinfo.green_offset = 8;
122 fbinfo.green_length = 8;
123 fbinfo.blue_offset = 16;
124 fbinfo.blue_length = 8;
125 fbinfo.alpha_offset = 24;
126 fbinfo.alpha_length = 0;
127 break;
128 case 4: /* RGB_565 */
129 fbinfo.bpp = 16;
130 fbinfo.size = w * h * 2;
131 fbinfo.width = w;
132 fbinfo.height = h;
133 fbinfo.red_offset = 11;
134 fbinfo.red_length = 5;
135 fbinfo.green_offset = 5;
136 fbinfo.green_length = 6;
137 fbinfo.blue_offset = 0;
138 fbinfo.blue_length = 5;
139 fbinfo.alpha_offset = 0;
140 fbinfo.alpha_length = 0;
141 break;
142 case 5: /* BGRA_8888 */
143 fbinfo.bpp = 32;
144 fbinfo.size = w * h * 4;
145 fbinfo.width = w;
146 fbinfo.height = h;
147 fbinfo.red_offset = 16;
148 fbinfo.red_length = 8;
149 fbinfo.green_offset = 8;
150 fbinfo.green_length = 8;
151 fbinfo.blue_offset = 0;
152 fbinfo.blue_length = 8;
153 fbinfo.alpha_offset = 24;
154 fbinfo.alpha_length = 8;
155 break;
156 default:
157 goto done;
158 }
159
160 /* write header */
161 if(writex(fd, &fbinfo, sizeof(fbinfo))) goto done;
162
163 /* write data */
164 for(i = 0; i < fbinfo.size; i += sizeof(buf)) {
165 if(readx(fd_screencap, buf, sizeof(buf))) goto done;
166 if(writex(fd, buf, sizeof(buf))) goto done;
167 }
168 if(readx(fd_screencap, buf, fbinfo.size % sizeof(buf))) goto done;
169 if(writex(fd, buf, fbinfo.size % sizeof(buf))) goto done;
170
171 done:
172 close(fds[0]);
173 close(fds[1]);
174 close(fd);
175 }
176