70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <fcntl.h>
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#include "fdevent.h"
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#include "adb.h"
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#include <linux/fb.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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/* TODO:
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** - grab the current buffer, not the first buffer
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** - sync with vsync to avoid tearing
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*/
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void framebuffer_service(int fd, void *cookie)
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{
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struct fb_var_screeninfo vinfo;
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int fb;
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void *ptr = MAP_FAILED;
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char x;
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unsigned fbinfo[4];
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fb = open("/dev/graphics/fb0", O_RDONLY);
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if(fb < 0) goto done;
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if(ioctl(fb, FBIOGET_VSCREENINFO, &vinfo) < 0) goto done;
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fcntl(fb, F_SETFD, FD_CLOEXEC);
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fbinfo[0] = 16;
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fbinfo[1] = vinfo.xres * vinfo.yres * 2;
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fbinfo[2] = vinfo.xres;
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fbinfo[3] = vinfo.yres;
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ptr = mmap(0, fbinfo[1], PROT_READ, MAP_SHARED, fb, 0);
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if(ptr == MAP_FAILED) goto done;
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if(writex(fd, fbinfo, sizeof(unsigned) * 4)) goto done;
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for(;;) {
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if(readx(fd, &x, 1)) goto done;
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if(writex(fd, ptr, fbinfo[1])) goto done;
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}
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done:
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if(ptr != MAP_FAILED) munmap(ptr, fbinfo[1]);
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if(fb >= 0) close(fb);
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close(fd);
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}
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