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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
*/
/* This version number defines the format of the fbinfo struct.
It must match versioning in ddms where this data is consumed. */
#define DDMS_RAWIMAGE_VERSION 1
struct fbinfo {
unsigned int version;
unsigned int bpp;
unsigned int size;
unsigned int width;
unsigned int height;
unsigned int red_offset;
unsigned int red_length;
unsigned int blue_offset;
unsigned int blue_length;
unsigned int green_offset;
unsigned int green_length;
unsigned int alpha_offset;
unsigned int alpha_length;
} __attribute__((packed));
void framebuffer_service(int fd, void *cookie)
{
struct fbinfo fbinfo;
unsigned int i;
char buf[640];
int fd_screencap;
int w, h, f;
int fds[2];
if (pipe(fds) < 0) goto done;
pid_t pid = fork();
if (pid < 0) goto done;
if (pid == 0) {
dup2(fds[1], STDOUT_FILENO);
close(fds[0]);
close(fds[1]);
const char* command = "screencap";
const char *args[2] = {command, NULL};
execvp(command, (char**)args);
exit(1);
}
fd_screencap = fds[0];
/* read w, h & format */
if(readx(fd_screencap, &w, 4)) goto done;
if(readx(fd_screencap, &h, 4)) goto done;
if(readx(fd_screencap, &f, 4)) goto done;
/* for now always assume RGBX_8888 format */
fbinfo.version = DDMS_RAWIMAGE_VERSION;
fbinfo.bpp = 32;
fbinfo.size = w * h * 4;
fbinfo.width = w;
fbinfo.height = h;
fbinfo.red_offset = 0;
fbinfo.red_length = 8;
fbinfo.green_offset = 8;
fbinfo.green_length = 8;
fbinfo.blue_offset = 16;
fbinfo.blue_length = 8;
fbinfo.alpha_offset = 24;
fbinfo.alpha_length = 8;
/* write header */
if(writex(fd, &fbinfo, sizeof(fbinfo))) goto done;
/* write data */
for(i = 0; i < fbinfo.size; i += sizeof(buf)) {
if(readx(fd_screencap, buf, sizeof(buf))) goto done;
if(writex(fd, buf, sizeof(buf))) goto done;
}
if(readx(fd_screencap, buf, fbinfo.size % sizeof(buf))) goto done;
if(writex(fd, buf, fbinfo.size % sizeof(buf))) goto done;
done:
close(fds[0]);
close(fds[1]);
close(fd);
}
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