http://yaos.blog.sohu.com/20240931.html

今天看别人的代码，知道可以使控制台进入图形模式，这样SHELL程序的显示就不会影响BMP图像的显示了。于是，COPY过来，放入自己先前的那个程序，再整个800x600的BMP图，试试全屏显示的效果！爽^0^爽

/*

showbmp.c

allenyao 2006/11/10

*/

#include #include #include #include #include #include #include /*新添加的，用于进行图形模式时ioctl使用*/

#include #include #include

typedef struct

{

char cfType[2];         /* 文件类型, 必须为 "BM" (0x4D42) */

char cfSize[4];         /* 文件的大小(字节) */

char cfReserved[4];     /* 保留, 必须为 0 */

char cfoffBits[4];      /* 位图阵列相对于文件头的偏移量(字节) */

} BITMAPFILEHEADER;       /* 文件头结构 */

typedef struct

{

char ciSize[4];         /* size of BITMAPINFOHEADER */

char ciWidth[4];        /* 位图宽度(像素) */

char ciHeight[4];       /* 位图高度(像素) */

char ciPlanes[2];       /* 目标设备的位平面数, 必须置为1 */

char ciBitCount[2];     /* 每个像素的位数, 1,4,8或24 */

char ciCompress[4];     /* 位图阵列的压缩方法,0=不压缩 */

char ciSizeImage[4];    /* 图像大小(字节) */

char ciXPelsPerMeter[4];/* 目标设备水平每米像素个数 */

char ciYPelsPerMeter[4];/* 目标设备垂直每米像素个数 */

char ciClrUsed[4];      /* 位图实际使用的颜色表的颜色数 */

char ciClrImportant[4]; /* 重要颜色索引的个数 */

} BITMAPINFOHEADER;       /* 位图信息头结构 */

typedef struct

{

char rgbBlue;

char rgbGreen;

char rgbRed;

char rgbReserved;

} RGBQUAD;

BITMAPFILEHEADER FileHead;

BITMAPINFOHEADER InfoHead;

RGBQUAD rgbquad;

char *fbp = 0;

int xres = 0;

int yres = 0;

int bits_per_pixel = 0;

int tty;

int tty_mode_was;

int set_tty_graphics( void );

int set_tty_text( void );

int  show_bmp  ( char *bmpfile );

long chartolong( char * string, int length );

/******************************************************************************

*

******************************************************************************/

int main( int argc, char *argv[] )

{

int fbfd = 0;

struct fb_var_screeninfo vinfo;

struct fb_fix_screeninfo finfo;

long int screensize = 0;

// Open the file for reading and writing

fbfd = open("/dev/fb0", O_RDWR);

if (!fbfd)

{

printf("Error: cannot open framebuffer device.\n");

exit(1);

}

// Get fixed screen information

if (ioctl(fbfd, FBIOGET_FSCREENINFO, &finfo))

{

printf("Error reading fixed information.\n");

exit(2);

}

// Get variable screen information

if (ioctl(fbfd, FBIOGET_VSCREENINFO, &vinfo))

{

printf("Error reading variable information.\n");

exit(3);

}

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;

// Figure out the size of the screen in bytes

screensize = vinfo.xres * vinfo.yres * vinfo.bits_per_pixel / 8;

// Map the device to memory

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);

}

if (set_tty_graphics())

{

show_bmp( argv[1] );

}

sleep( 10 );

set_tty_text();

munmap(fbp, screensize);

close(fbfd);

return 0;

}

/******************************************************************************

*

******************************************************************************/

int show_bmp( char *bmpfile )

{

FILE *fp;

int rc;

int ciBitCount, ciWidth, ciHeight;

int line_x, line_y;

long int location = 0, BytesPerLine = 0;

char tmp[1024*10];

/* 打开位图文件 */

fp = fopen( bmpfile, "rb" );

if (fp == NULL)

{

return( -1 );

}

/* 读取位图文件头 */

rc = fread( &FileHead, 1, sizeof(BITMAPFILEHEADER), fp );

if ( rc != sizeof( BITMAPFILEHEADER ) )

{

fclose( fp );

return( -2 );

}

/* 判断位图的类型 */

if (memcmp(FileHead.cfType, "BM", 2) != 0)

{

fclose( fp );

return( -3 );

}

/* 读取位图信息头 */

rc = fread( (char *)&InfoHead, 1, sizeof(BITMAPINFOHEADER), fp );

if ( rc != sizeof(BITMAPINFOHEADER) )

{

fclose( fp );

return( -4 );

}

ciWidth    = (int) chartolong( InfoHead.ciWidth,    4 );

ciHeight   = (int) chartolong( InfoHead.ciHeight,   4 );

ciBitCount = (int) chartolong( InfoHead.ciBitCount, 4 );

line_x = line_y = 0;

/*

while( !feof( fp ) )

{

rc = fread( (char *)&rgbquad, 1, sizeof(RGBQUAD), fp );

if ( rc != sizeof(RGBQUAD) )

{

break;

}

location = line_x * bits_per_pixel / 8 + (ciHeight - line_y - 1) * xres * bits_per_pixel / 8;

*(fbp + location) = rgbquad.rgbBlue;

*(fbp + location + 1) = rgbquad.rgbGreen;

*(fbp + location + 2) = rgbquad.rgbRed;

*(fbp + location + 3) = rgbquad.rgbReserved;

line_x++;

if ( line_x == ( ciWidth - 1 ) )

{

line_x = 0;

line_y++;

}

}

*/

BytesPerLine = (ciWidth * ciBitCount + 31) / 32 * 4;

while( !feof( fp ) )

{

rc = fread( tmp, 1, BytesPerLine, fp );

if ( rc != BytesPerLine )

{

break;

}

location = (ciHeight - line_y - 1) * xres * bits_per_pixel / 8;

memcpy( (fbp + location) , tmp, BytesPerLine );

line_y++;

}

fclose( fp );

return( 0 );

}

/******************************************************************************

*

******************************************************************************/

long chartolong( char * string, int length )

{

long number;

if (length <= 4)

{

memset( &number, 0x00, sizeof(long) );

memcpy( &number, string, length );

}

return( number );

}

/******************************************************************************

*

******************************************************************************/

int set_tty_graphics( void )

{

int ret = 1;

if(0 > (tty = open("/dev/tty0", O_RDWR)))

{

printf( "ERROR: /dev/tty0 open failed\n" );

ret = 0;

}

else if(0 > ioctl(tty, KDGETMODE, &tty_mode_was))

{

printf( "ERROR: /dev/tty0 get mode failed\n");

close(tty);

ret = 0;

}

else if((KD_GRAPHICS != tty_mode_was)

&& (0 > ioctl(tty, KDSETMODE, KD_GRAPHICS)))

{

printf( "ERROR: /dev/tty0 set graphics failed\n");

close(tty);

ret = 0;

}

else

{

printf("tty mode was ");

switch(tty_mode_was)

{

case KD_TEXT     :  printf("KD_TEXT"     ); break;

case KD_GRAPHICS :  printf("KD_GRAPHICS" ); break;

default          :  printf("IMPOSSIBLE!" ); break;

}

printf("\n");

printf("tty mode set to KD_GRAPHICS\n");

fflush(stdout);

close(tty);

}

return( ret );

}

/******************************************************************************

*

******************************************************************************/

int set_tty_text( void )

{

int ret = 1;

if(0 > (tty = open("/dev/tty0", O_RDWR)))

{

printf( "ERROR: /dev/tty0 open failed\n" );

ret = 0;

}

else if(0 > ioctl(tty, KDSETMODE, tty_mode_was))

{

printf( "ERROR: /dev/tty0 reset mode failed\n");

close(tty);

ret = 0;

}

else

{

printf("tty mode set to ");

switch(tty_mode_was)

{

case KD_TEXT     :  printf("KD_TEXT"     ); break;

case KD_GRAPHICS :  printf("KD_GRAPHICS" ); break;

default          :  printf("IMPOSSIBLE!" ); break;

}

printf("\n");

fflush(stdout);

close(tty);

}

return( ret );

}

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