framebuffer_service.c revision dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0
1dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project/* 2dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * Copyright (C) 2007 The Android Open Source Project 3dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * 4dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 5dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * you may not use this file except in compliance with the License. 6dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * You may obtain a copy of the License at 7dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * 8dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 9dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * 10dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 11dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 12dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * See the License for the specific language governing permissions and 14dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * limitations under the License. 15dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project */ 16dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 17dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <stdlib.h> 18dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <stdio.h> 19dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <unistd.h> 20dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <string.h> 21dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <fcntl.h> 22dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 23dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <cutils/fdevent.h> 24dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include "adb.h" 25dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 26dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <linux/fb.h> 27dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <sys/ioctl.h> 28dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <sys/mman.h> 29dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 30dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project/* TODO: 31dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** - grab the current buffer, not the first buffer 32dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** - sync with vsync to avoid tearing 33dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project*/ 34dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 35dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectvoid framebuffer_service(int fd, void *cookie) 36dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project{ 37dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project struct fb_var_screeninfo vinfo; 38dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project int fb; 39dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project void *ptr = MAP_FAILED; 40dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project char x; 41dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 42dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project unsigned fbinfo[4]; 43dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 44dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project fb = open("/dev/graphics/fb0", O_RDONLY); 45dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if(fb < 0) goto done; 46dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 47dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if(ioctl(fb, FBIOGET_VSCREENINFO, &vinfo) < 0) goto done; 48dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project fcntl(fb, F_SETFD, FD_CLOEXEC); 49dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 50dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project fbinfo[0] = 16; 51dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project fbinfo[1] = vinfo.xres * vinfo.yres * 2; 52dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project fbinfo[2] = vinfo.xres; 53dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project fbinfo[3] = vinfo.yres; 54dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 55dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project ptr = mmap(0, fbinfo[1], PROT_READ, MAP_SHARED, fb, 0); 56dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if(ptr == MAP_FAILED) goto done; 57dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 58dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if(writex(fd, fbinfo, sizeof(unsigned) * 4)) goto done; 59dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 60dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project for(;;) { 61dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if(readx(fd, &x, 1)) goto done; 62dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if(writex(fd, ptr, fbinfo[1])) goto done; 63dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 64dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 65dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectdone: 66dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if(ptr != MAP_FAILED) munmap(ptr, fbinfo[1]); 67dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if(fb >= 0) close(fb); 68dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project close(fd); 69dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 70dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 71