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/*
* 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 <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include "fdevent.h"
#include "adb.h"
#include <linux/fb.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
/* TODO:
** - sync with vsync to avoid tearing
*/
void framebuffer_service(int fd, void *cookie)
{
struct fb_var_screeninfo vinfo;
int fb, offset;
char x[256];
unsigned fbinfo[4];
unsigned i, bytespp;
fb = open("/dev/graphics/fb0", O_RDONLY);
if(fb < 0) goto done;
if(ioctl(fb, FBIOGET_VSCREENINFO, &vinfo) < 0) goto done;
fcntl(fb, F_SETFD, FD_CLOEXEC);
bytespp = vinfo.bits_per_pixel / 8;
fbinfo[0] = vinfo.bits_per_pixel;
fbinfo[1] = vinfo.xres * vinfo.yres * bytespp;
fbinfo[2] = vinfo.xres;
fbinfo[3] = vinfo.yres;
/* HACK: for several of our 3d cores a specific alignment
* is required so the start of the fb may not be an integer number of lines
* from the base. As a result we are storing the additional offset in
* xoffset. This is not the correct usage for xoffset, it should be added
* to each line, not just once at the beginning */
offset = vinfo.xoffset * bytespp;
offset += vinfo.xres * vinfo.yoffset * bytespp;
if(writex(fd, fbinfo, sizeof(fbinfo))) goto done;
lseek(fb, offset, SEEK_SET);
for(i = 0; i < fbinfo[1]; i += 256) {
if(readx(fb, &x, 256)) goto done;
if(writex(fd, &x, 256)) goto done;
}
if(readx(fb, &x, fbinfo[1] % 256)) goto done;
if(writex(fd, &x, fbinfo[1] % 256)) goto done;
done:
if(fb >= 0) close(fb);
close(fd);
}
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