/* * Copyright (C) 2007 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include #include #include #include #include #include #include #include #include "fdevent.h" #include "adb.h" #include #include #include /* * TEMP_FAILURE_RETRY is defined by some, but not all, versions of * . (Alas, it is not as standard as we'd hoped!) So, if it's * not already defined, then define it here. */ #ifndef TEMP_FAILURE_RETRY /* Used to retry syscalls that can return EINTR. */ #define TEMP_FAILURE_RETRY(exp) ({ \ typeof (exp) _rc; \ do { \ _rc = (exp); \ } while (_rc == -1 && errno == EINTR); \ _rc; }) #endif /* TODO: ** - sync with vsync to avoid tearing */ /* This version number defines the format of the fbinfo struct. It must match versioning in ddms where this data is consumed. */ #define DDMS_RAWIMAGE_VERSION 1 struct fbinfo { unsigned int version; unsigned int bpp; unsigned int size; unsigned int width; unsigned int height; unsigned int red_offset; unsigned int red_length; unsigned int blue_offset; unsigned int blue_length; unsigned int green_offset; unsigned int green_length; unsigned int alpha_offset; unsigned int alpha_length; } __attribute__((packed)); void framebuffer_service(int fd, void *cookie) { struct fbinfo fbinfo; unsigned int i; char buf[1024]; int fd_screencap; int w, h, f; int fds[2]; if (pipe(fds) < 0) goto done; pid_t pid = fork(); if (pid < 0) goto done; if (pid == 0) { dup2(fds[1], STDOUT_FILENO); close(fds[0]); close(fds[1]); const char* command = "screencap"; const char *args[2] = {command, NULL}; execvp(command, (char**)args); exit(1); } fd_screencap = fds[0]; /* read w, h & format */ if(readx(fd_screencap, &w, 4)) goto done; if(readx(fd_screencap, &h, 4)) goto done; if(readx(fd_screencap, &f, 4)) goto done; fbinfo.version = DDMS_RAWIMAGE_VERSION; /* see hardware/hardware.h */ switch (f) { case 1: /* RGBA_8888 */ fbinfo.bpp = 32; fbinfo.size = w * h * 4; fbinfo.width = w; fbinfo.height = h; fbinfo.red_offset = 0; fbinfo.red_length = 8; fbinfo.green_offset = 8; fbinfo.green_length = 8; fbinfo.blue_offset = 16; fbinfo.blue_length = 8; fbinfo.alpha_offset = 24; fbinfo.alpha_length = 8; break; case 2: /* RGBX_8888 */ fbinfo.bpp = 32; fbinfo.size = w * h * 4; fbinfo.width = w; fbinfo.height = h; fbinfo.red_offset = 0; fbinfo.red_length = 8; fbinfo.green_offset = 8; fbinfo.green_length = 8; fbinfo.blue_offset = 16; fbinfo.blue_length = 8; fbinfo.alpha_offset = 24; fbinfo.alpha_length = 0; break; case 3: /* RGB_888 */ fbinfo.bpp = 24; fbinfo.size = w * h * 3; fbinfo.width = w; fbinfo.height = h; fbinfo.red_offset = 0; fbinfo.red_length = 8; fbinfo.green_offset = 8; fbinfo.green_length = 8; fbinfo.blue_offset = 16; fbinfo.blue_length = 8; fbinfo.alpha_offset = 24; fbinfo.alpha_length = 0; break; case 4: /* RGB_565 */ fbinfo.bpp = 16; fbinfo.size = w * h * 2; fbinfo.width = w; fbinfo.height = h; fbinfo.red_offset = 11; fbinfo.red_length = 5; fbinfo.green_offset = 5; fbinfo.green_length = 6; fbinfo.blue_offset = 0; fbinfo.blue_length = 5; fbinfo.alpha_offset = 0; fbinfo.alpha_length = 0; break; case 5: /* BGRA_8888 */ fbinfo.bpp = 32; fbinfo.size = w * h * 4; fbinfo.width = w; fbinfo.height = h; fbinfo.red_offset = 16; fbinfo.red_length = 8; fbinfo.green_offset = 8; fbinfo.green_length = 8; fbinfo.blue_offset = 0; fbinfo.blue_length = 8; fbinfo.alpha_offset = 24; fbinfo.alpha_length = 8; break; default: goto done; } /* write header */ if(writex(fd, &fbinfo, sizeof(fbinfo))) goto done; /* write data */ for(i = 0; i < fbinfo.size; i += sizeof(buf)) { if(readx(fd_screencap, buf, sizeof(buf))) goto done; if(writex(fd, buf, sizeof(buf))) goto done; } if(readx(fd_screencap, buf, fbinfo.size % sizeof(buf))) goto done; if(writex(fd, buf, fbinfo.size % sizeof(buf))) goto done; done: TEMP_FAILURE_RETRY(waitpid(pid, NULL, 0)); close(fds[0]); close(fds[1]); close(fd); }