测试了一下S3C6410 LCD控制器提供的Overlay功能，写了一个简单的test，主要用于实现FB0和FB1之间的Overlay操作。
内核选项的Windows至少要为2。
具体支持如下操作：
1 使能OSD
2 关闭OSD
3 增加OSD的Alpha值
4 减少OSD的Alpha值
5 手动设置Alpha值（0-15）
6 上移OSD层
7 下移OSD层
8 左移OSD层
9 右移OSD层
10 设置OSD层
其中设置OSD层最重要，可以重新设置窗口的大小和起始位置，主要设置完后需要重新填充窗口数据，旧的数据将错乱。
///////////////////////////////////////////////////////////////
s3cfb.h
///////////////////////////////////////////////////////////////
#include <stdint.h>
#include <sys/types.h>
typedef struct {
int bpp;
int left_x;
int top_y;
int width;
int height;
} s3c_win_info_t;
typedef struct{
__u32 phy_start_addr;
__u32 xres;
__u32 yres;
__u32 xres_virtual;
__u32 yres_virtual;
__u32 xoffset;
__u32 yoffset;
__u32 lcd_offset_x;
__u32 lcd_offset_y;
} s3c_fb_next_info_t;
#define FBIO_WAITFORVSYNC _IOW ('F', 32, unsigned int)
#define S3C_FB_OSD_START _IO ('F', 201)
#define S3C_FB_OSD_STOP _IO('F', 202)
#define S3C_FB_OSD_SET_INFO _IOW ('F', 209, s3c_win_info_t)
#define S3C_FB_CHANGE_REQ _IOW ('F', 308, int)
#define S3C_FB_GET_CURR_FB_INFO _IOR ('F', 321, s3c_fb_next_info_t)
#define S3C_FB_OSD_ALPHA_UP _IO ('F', 203)
#define S3C_FB_OSD_ALPHA_DOWN _IO ('F', 204)
#define S3C_FB_OSD_MOVE_LEFT _IO ('F', 205)
#define S3C_FB_OSD_MOVE_RIGHT _IO ('F', 206)
#define S3C_FB_OSD_MOVE_UP _IO ('F', 207)
#define S3C_FB_OSD_MOVE_DOWN _IO ('F', 208)
#define S3C_FB_OSD_ALPHA_SET _IOW ('F', 210, unsigned int)
#define S3C_FB_OSD_ALPHA0_SET _IOW ('F', 211, unsigned int)
#define S3C_FB_OSD_ALPHA_MODE _IOW ('F', 212, unsigned int)
////////////////////////////////////////////////////////////////
osd.c
////////////////////////////////////////////////////////////////
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include "fb.h"
#include "s3cfb.h"
#define DEV_FB0 "/dev/fb0"
#define DEV_FB1 "/dev/fb1"
#define FILE1 "/overlay/1.bin"
#define FILE2 "/overlay/2.bin"
int stat,err;
int fb0,fb1;
s3c_win_info_t osd_info;
void set_osd_info(){
int input;
osd_info.bpp = 16;
printf("please input left x coordinate
");
scanf("%d",&input);
osd_info.left_x = input;
printf("please input top y coordinate
");
scanf("%d",&input);
osd_info.top_y = input;
printf("please input ods width
");
scanf("%d",&input);
osd_info.width = input;
printf("please input osd height
");
scanf("%d",&input);
osd_info.height = input;
}
int main(int argc, char *argv[])
{
printf("Begin the OSD test!
");
if(argc < 2){
printf("Usage: ./osd 1
"); //reserved
return -1;
}
fb0 = open("/dev/fb0",O_RDWR);
if(fb0 < 0) {
printf("open err! fb0 is %d
",fb0);
return -1;
}
fb1 = open("/dev/fb1",O_RDWR);
if(fb1 < 0) {
printf("open err! fb1 is %d
",fb1);
return -1;
}
stat = atoi(argv[1]);
printf("stat is %d
",stat);
switch(stat){
case 1:
sleep(1);
ioctl(fb1,S3C_FB_OSD_START);
break;
default:
printf("err argv!
");
}
while(1){
printf("Please choose one option:
");
printf("1. enable the OSD
");
printf("2. disable the OSD
");
printf("3. + OSD alpha
");
printf("4. - OSD alpha
");
printf("5. set OSD alpha
");
printf("6. move up OSD
");
printf("7. move down OSD
");
printf("8. move left OSD
");
printf("9. move right OSD
");
printf("10. SET OSD INFO
");
printf("0. exit
");
scanf("%d",&stat);
switch(stat){
case 1:
err = ioctl(fb1,S3C_FB_OSD_START);
if(err < 0) printf("ioctl err =%d",err);
break;
case 2:
err = ioctl(fb1,S3C_FB_OSD_STOP);
if(err < 0) printf("ioctl err =%d",err);
break;
case 3:
err = ioctl(fb1,S3C_FB_OSD_ALPHA_UP);
if(err < 0) printf("ioctl err =%d",err);
break;
case 4:
err = ioctl(fb1,S3C_FB_OSD_ALPHA_DOWN);
if(err < 0) printf("ioctl err =%d",err);
break;
case 5:
printf("please input your alpha level[0~15]
");
scanf("%d",&stat);
err = ioctl(fb1,S3C_FB_OSD_ALPHA_SET,stat);
if(err < 0) printf("ioctl err =%d",err);
break;
case 6:
err = ioctl(fb1,S3C_FB_OSD_MOVE_UP);
if(err < 0) printf("ioctl err =%d",err);
break;
case 7:
err = ioctl(fb1,S3C_FB_OSD_MOVE_DOWN);
if(err < 0) printf("ioctl err =%d",err);
break;
case 8:
ioctl(fb1,S3C_FB_OSD_MOVE_LEFT);
break;
case 9:
err = ioctl(fb1,S3C_FB_OSD_MOVE_RIGHT);
if(err < 0) printf("ioctl err =%d",err);
break;
case 10:
set_osd_info();
err = ioctl(fb1,S3C_FB_OSD_SET_INFO,&osd_info);
if(err < 0) printf("ioctl err =%d",err);
break;
case 0:
goto exit;
default:
printf("please input number 0~10
");
}
} //end of while(1)
exit:
sleep(1);
err = ioctl(fb1,S3C_FB_OSD_STOP);
if(err < 0) printf("ioctl err =%d",err);
return 0;
}
///////////////////////////////////////////////////////////////////////
//偷懒直接用脚本cat的图片数据test.sh
///////////////////////////////////////////////////////////////////////
#!/bin/sh
cat ./1.bin > /dev/fb0
cat ./22.bin > /dev/fb1
#cat ./3.bin > /dev/fb2
#cat ./4.bin > /dev/fb3
#cat ./5.bin > /dev/fb4
./osd 1
