开发学院操作系统 Linux/Unix linux下的framebuffer显示图片阅读

linux下的framebuffer显示图片

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核心提示： void showbmp2(){int x,y;unsigned char *p;int index=0; struct fb_var_screeninfo vinfo; struct fb_fix_screeninfo finfo; struct fb_bitfield red; struct fb_bitf

void showbmp2()
{
int x,y;
unsigned char *p;
int index=0;
struct fb_var_screeninfo vinfo;
struct fb_fix_screeninfo finfo;
struct fb_bitfield red;
struct fb_bitfield green;
struct fb_bitfield blue;
//open the showdeviece
fbfd = open("/dev/fb0", O_RDWR);
if (!fbfd)
{
printf("Error: cannot open framebuffer device.\n");
exit(1);
}

if (ioctl(fbfd, FBIOGET_FSCREENINFO, &finfo))
{
printf("Error£ºreading fixed information.\n");
exit(2);
}

if (ioctl(fbfd, FBIOGET_VSCREENINFO, &vinfo))
{
printf("Error: reading variable information.\n");
exit(3);
}

printf("R:%d,G:%d,B:%d \n", vinfo.red, vinfo.green, vinfo.blue );

printf("%dx%d, %dbpp\n", vinfo.xres, vinfo.yres, vinfo.bits_per_pixel );
xres = vinfo.xres;
yres = vinfo.yres;
bits_per_pixel = vinfo.bits_per_pixel;

//ŒÆËãÆÁÄ»µÄ×ÜŽóÐ¡£š×ÖœÚ£©
screensize = vinfo.xres * vinfo.yres * vinfo.bits_per_pixel / 8;
printf("screensize=%d byte\n",screensize);

//¶ÔÏóÓ³Éä
fbp = (char *)mmap(0, screensize, PROT_READ | PROT_WRITE, MAP_SHARED, fbfd, 0);
if ((int)fbp == -1)
{
printf("Error: failed to map framebuffer device to memory.\n");
exit(4);
}

printf("sizeof file header=%d\n", sizeof(BITMAPFILEHEADER));

printf("into show_bmp function\n");
FILE *fp[3];
fp[0] = fopen("./333.bmp","rb+");
fp[1] = fopen("./444.bmp","rb+");
fp[2] = fopen("./555.bmp","rb+");
fread(data,54,1,fp[0]);
fread(data,WIDTH*HEIGHT*3,1,fp[0]);
for(y=0;y<HEIGHT;y++)
{
for(x=0;x<WIDTH;x++)
{
//if(x<640)
{
buf[1][(((HEIGHT-1)-y)*WIDTH+x)*4 + 0] = data[((y*WIDTH) + x)*3 + 0];
buf[1][(((HEIGHT-1)-y)*WIDTH+x)*4 + 1] = data[((y*WIDTH) + x)*3 + 1];
buf[1][(((HEIGHT-1)-y)*WIDTH+x)*4 + 2] = data[((y*WIDTH) + x)*3 + 2];
//buf[1][(479-y)*WIDTH+x)*4 + 3] = data[((y*640) + x)*3 + 0];
}
}
}
//
fread(data,54,1,fp[1]);
fread(data,WIDTH*HEIGHT*3,1,fp[1]);
for(y=0;y<HEIGHT;y++)
{
for(x=0;x<WIDTH;x++)
{
//if(x<640)
{
buf[2][(((HEIGHT-1)-y)*WIDTH+x)*4 + 0] = data[((y*WIDTH) + x)*3 + 0];
buf[2][(((HEIGHT-1)-y)*WIDTH+x)*4 + 1] = data[((y*WIDTH) + x)*3 + 1];
buf[2][(((HEIGHT-1)-y)*WIDTH+x)*4 + 2] = data[((y*WIDTH) + x)*3 + 2];
//buf[1][(479-y)*WIDTH+x)*4 + 3] = data[((y*640) + x)*3 + 0];
}
}
}
//
fread(data,54,1,fp[2]);
fread(data,WIDTH*HEIGHT*3,1,fp[2]);
for(y=0;y<HEIGHT;y++)