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 52 void framebuffer_service(int fd, void *cookie) 53 { 54 struct fb_var_screeninfo vinfo; 55 int fb, offset; 56 char x[256]; 57 58 struct fbinfo fbinfo; 59 unsigned i, bytespp; 60 61 fb = open("/dev/graphics/fb0", O_RDONLY); 62 if(fb < 0) goto done; 63 64 if(ioctl(fb, FBIOGET_VSCREENINFO, &vinfo) < 0) goto done; 65 fcntl(fb, F_SETFD, FD_CLOEXEC); 66 67 bytespp = vinfo.bits_per_pixel / 8; 68 69 fbinfo.version = DDMS_RAWIMAGE_VERSION; 70 fbinfo.bpp = vinfo.bits_per_pixel; 71 fbinfo.size = vinfo.xres * vinfo.yres * bytespp; 72 fbinfo.width = vinfo.xres; 73 fbinfo.height = vinfo.yres; 74 fbinfo.red_offset = vinfo.red.offset; 75 fbinfo.red_length = vinfo.red.length; 76 fbinfo.green_offset = vinfo.green.offset; 77 fbinfo.green_length = vinfo.green.length; 78 fbinfo.blue_offset = vinfo.blue.offset; 79 fbinfo.blue_length = vinfo.blue.length; 80 fbinfo.alpha_offset = vinfo.transp.offset; 81 fbinfo.alpha_length = vinfo.transp.length; 82 83 /* HACK: for several of our 3d cores a specific alignment 84 * is required so the start of the fb may not be an integer number of lines 85 * from the base. As a result we are storing the additional offset in 86 * xoffset. This is not the correct usage for xoffset, it should be added 87 * to each line, not just once at the beginning */ 88 offset = vinfo.xoffset * bytespp; 89 90 offset += vinfo.xres * vinfo.yoffset * bytespp; 91 92 if(writex(fd, &fbinfo, sizeof(fbinfo))) goto done; 93 94 lseek(fb, offset, SEEK_SET); 95 for(i = 0; i < fbinfo.size; i += 256) { 96 if(readx(fb, &x, 256)) goto done; 97 if(writex(fd, &x, 256)) goto done; 98 } 99 100 if(readx(fb, &x, fbinfo.size % 256)) goto done; 101 if(writex(fd, &x, fbinfo.size % 256)) goto done; 102 103 done: 104 if(fb >= 0) close(fb); 105 close(fd); 106 } 107
