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 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