| xj | 123f7cc | 2022-06-06 11:35:21 +0800 | [diff] [blame] | 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 | #include <errno.h> |
| 23 | #include <sys/types.h> |
| 24 | #include <sys/wait.h> |
| 25 | |
| 26 | #include "fdevent.h" |
| 27 | #include "adb.h" |
| 28 | |
| 29 | #include <linux/fb.h> |
| 30 | #include <sys/ioctl.h> |
| 31 | #include <sys/mman.h> |
| 32 | |
| 33 | #include <cutils/fs.h> |
| 34 | |
| 35 | /* TODO: |
| 36 | ** - sync with vsync to avoid tearing |
| 37 | */ |
| 38 | /* This version number defines the format of the fbinfo struct. |
| 39 | It must match versioning in ddms where this data is consumed. */ |
| 40 | #define DDMS_RAWIMAGE_VERSION 1 |
| 41 | struct fbinfo { |
| 42 | unsigned int version; |
| 43 | unsigned int bpp; |
| 44 | unsigned int size; |
| 45 | unsigned int width; |
| 46 | unsigned int height; |
| 47 | unsigned int red_offset; |
| 48 | unsigned int red_length; |
| 49 | unsigned int blue_offset; |
| 50 | unsigned int blue_length; |
| 51 | unsigned int green_offset; |
| 52 | unsigned int green_length; |
| 53 | unsigned int alpha_offset; |
| 54 | unsigned int alpha_length; |
| 55 | } __attribute__((packed)); |
| 56 | |
| 57 | void framebuffer_service(int fd, void *cookie) |
| 58 | { |
| 59 | struct fbinfo fbinfo; |
| 60 | unsigned int i, bsize; |
| 61 | char buf[640]; |
| 62 | int fd_screencap; |
| 63 | int w, h, f; |
| 64 | int fds[2]; |
| 65 | |
| 66 | if (pipe2(fds, O_CLOEXEC) < 0) goto pipefail; |
| 67 | |
| 68 | pid_t pid = fork(); |
| 69 | if (pid < 0) goto done; |
| 70 | |
| 71 | if (pid == 0) { |
| 72 | dup2(fds[1], STDOUT_FILENO); |
| 73 | close(fds[0]); |
| 74 | close(fds[1]); |
| 75 | const char* command = "screencap"; |
| 76 | const char *args[2] = {command, NULL}; |
| 77 | execvp(command, (char**)args); |
| 78 | exit(1); |
| 79 | } |
| 80 | |
| 81 | fd_screencap = fds[0]; |
| 82 | |
| 83 | /* read w, h & format */ |
| 84 | if(readx(fd_screencap, &w, 4)) goto done; |
| 85 | if(readx(fd_screencap, &h, 4)) goto done; |
| 86 | if(readx(fd_screencap, &f, 4)) goto done; |
| 87 | |
| 88 | fbinfo.version = DDMS_RAWIMAGE_VERSION; |
| 89 | /* see hardware/hardware.h */ |
| 90 | switch (f) { |
| 91 | case 1: /* RGBA_8888 */ |
| 92 | fbinfo.bpp = 32; |
| 93 | fbinfo.size = w * h * 4; |
| 94 | fbinfo.width = w; |
| 95 | fbinfo.height = h; |
| 96 | fbinfo.red_offset = 0; |
| 97 | fbinfo.red_length = 8; |
| 98 | fbinfo.green_offset = 8; |
| 99 | fbinfo.green_length = 8; |
| 100 | fbinfo.blue_offset = 16; |
| 101 | fbinfo.blue_length = 8; |
| 102 | fbinfo.alpha_offset = 24; |
| 103 | fbinfo.alpha_length = 8; |
| 104 | break; |
| 105 | case 2: /* RGBX_8888 */ |
| 106 | fbinfo.bpp = 32; |
| 107 | fbinfo.size = w * h * 4; |
| 108 | fbinfo.width = w; |
| 109 | fbinfo.height = h; |
| 110 | fbinfo.red_offset = 0; |
| 111 | fbinfo.red_length = 8; |
| 112 | fbinfo.green_offset = 8; |
| 113 | fbinfo.green_length = 8; |
| 114 | fbinfo.blue_offset = 16; |
| 115 | fbinfo.blue_length = 8; |
| 116 | fbinfo.alpha_offset = 24; |
| 117 | fbinfo.alpha_length = 0; |
| 118 | break; |
| 119 | case 3: /* RGB_888 */ |
| 120 | fbinfo.bpp = 24; |
| 121 | fbinfo.size = w * h * 3; |
| 122 | fbinfo.width = w; |
| 123 | fbinfo.height = h; |
| 124 | fbinfo.red_offset = 0; |
| 125 | fbinfo.red_length = 8; |
| 126 | fbinfo.green_offset = 8; |
| 127 | fbinfo.green_length = 8; |
| 128 | fbinfo.blue_offset = 16; |
| 129 | fbinfo.blue_length = 8; |
| 130 | fbinfo.alpha_offset = 24; |
| 131 | fbinfo.alpha_length = 0; |
| 132 | break; |
| 133 | case 4: /* RGB_565 */ |
| 134 | fbinfo.bpp = 16; |
| 135 | fbinfo.size = w * h * 2; |
| 136 | fbinfo.width = w; |
| 137 | fbinfo.height = h; |
| 138 | fbinfo.red_offset = 11; |
| 139 | fbinfo.red_length = 5; |
| 140 | fbinfo.green_offset = 5; |
| 141 | fbinfo.green_length = 6; |
| 142 | fbinfo.blue_offset = 0; |
| 143 | fbinfo.blue_length = 5; |
| 144 | fbinfo.alpha_offset = 0; |
| 145 | fbinfo.alpha_length = 0; |
| 146 | break; |
| 147 | case 5: /* BGRA_8888 */ |
| 148 | fbinfo.bpp = 32; |
| 149 | fbinfo.size = w * h * 4; |
| 150 | fbinfo.width = w; |
| 151 | fbinfo.height = h; |
| 152 | fbinfo.red_offset = 16; |
| 153 | fbinfo.red_length = 8; |
| 154 | fbinfo.green_offset = 8; |
| 155 | fbinfo.green_length = 8; |
| 156 | fbinfo.blue_offset = 0; |
| 157 | fbinfo.blue_length = 8; |
| 158 | fbinfo.alpha_offset = 24; |
| 159 | fbinfo.alpha_length = 8; |
| 160 | break; |
| 161 | default: |
| 162 | goto done; |
| 163 | } |
| 164 | |
| 165 | /* write header */ |
| 166 | if(writex(fd, &fbinfo, sizeof(fbinfo))) goto done; |
| 167 | |
| 168 | /* write data */ |
| 169 | for(i = 0; i < fbinfo.size; i += bsize) { |
| 170 | bsize = sizeof(buf); |
| 171 | if (i + bsize > fbinfo.size) |
| 172 | bsize = fbinfo.size - i; |
| 173 | if(readx(fd_screencap, buf, bsize)) goto done; |
| 174 | if(writex(fd, buf, bsize)) goto done; |
| 175 | } |
| 176 | |
| 177 | done: |
| 178 | TEMP_FAILURE_RETRY(waitpid(pid, NULL, 0)); |
| 179 | |
| 180 | close(fds[0]); |
| 181 | close(fds[1]); |
| 182 | pipefail: |
| 183 | close(fd); |
| 184 | } |