create_bmp.c

将截获的FrameBuffer的显示内容,转换为BMP图像文件的程序.

#include<stdio.h>

struct STBMPInfo
{
    unsigned char m_FileType[2];
    unsigned long m_FileSize;
    unsigned int  m_Reserved1;
    unsigned int  m_Reserved2;
    unsigned long m_DataOffset;
    unsigned long m_HeaderSize;
    unsigned long m_Width;
    unsigned long m_Height;
    unsigned int  m_Planes;
    unsigned int  m_ColorBits;
    unsigned long m_Compression;
    unsigned long m_DataSize;
    unsigned long m_HResolution;
    unsigned long m_VResolution;
    unsigned long m_Colors;
    unsigned long m_ImportantColors;
};

/*------------------------------------------------------------------
 * Function name: displayBMPFile()
 * Description  : display bmp in gaven position
 * Input args   : int x, y : start coord, bmp_file : file name
 * Return       : NONE
 * Author       :
 * Time         : 2005/11/18
 * History      : new
 *-----------------------------------------------------------------*/
void createBMPFile( const char *base_file, const char *image_file )
{
    struct STBMPInfo bmp_info;
    FILE *bmpfp, *srcfp;
    unsigned char info_buf[54];
    unsigned char buf_line[1600];
    int line_size = 1600, data_offset, start_line;

    if(( bmpfp = fopen( base_file, "rb+" )) == NULL )
    {
        printf( "[displayBMPFile]Failed to open bmp file %s ...\n", bmp_file );
        return;
    }
    if(( srcfp = fopen( image_file, "rb" )) == NULL )
    {
    	printf( "[displayBMPFile]Failed to open bmp file %s ...\n", bmp_file );
    	return;
    }

    if( fread( info_buf, 1, 54, bmpfp ) < 54 )
    {
        fprintf( debug_err, "%s-%d[displayBMPFile]Invalid bmp file %s ...\n", _FL_, bmp_file );
        fclose( bmpfp );
        return;
    }
    bmp_info.m_FileType[0] = info_buf[0];
    bmp_info.m_FileType[1] = info_buf[1];
    bmp_info.m_FileSize    = info_buf[2]  | info_buf[3]  << 8 | info_buf[4]  << 16 | info_buf[5] << 24;
    bmp_info.m_DataOffset  = info_buf[10] | info_buf[11] << 8 | info_buf[12] << 16 | info_buf[13] << 24;
    bmp_info.m_HeaderSize  = info_buf[14] | info_buf[15] << 8 | info_buf[16] << 16 | info_buf[17] << 24;
    bmp_info.m_Width       = info_buf[18] | info_buf[19] << 8 | info_buf[20] << 16 | info_buf[21] << 24;
    bmp_info.m_Height      = info_buf[22] | info_buf[23] << 8 | info_buf[24] << 16 | info_buf[25] << 24;
    bmp_info.m_Planes      = info_buf[26] | info_buf[27] << 8;
    bmp_info.m_ColorBits   = info_buf[28] | info_buf[29] << 8;
    bmp_info.m_Compression = info_buf[30] | info_buf[31] << 8 | info_buf[32] << 16 | info_buf[33] << 24;
    bmp_info.m_DataSize    = info_buf[34] | info_buf[35] << 8 | info_buf[36] << 16 | info_buf[37] << 24;
    bmp_info.m_HResolution = info_buf[38] | info_buf[39] << 8 | info_buf[40] << 16 | info_buf[41] << 24;
    bmp_info.m_VResolution = info_buf[42] | info_buf[43] << 8 | info_buf[44] << 16 | info_buf[45] << 24;
    bmp_info.m_Colors      = info_buf[46] | info_buf[47] << 8 | info_buf[48] << 16 | info_buf[49] << 24;
    bmp_info.m_ImportantColors = info_buf[50] | info_buf[51] << 8 | info_buf[52] << 16 | info_buf[53] << 24;
    start_line = 599;
    data_offset = bmp_info.m_DataOffset + 1600 * start_line;

    buf_size = bmp_info.m_Width * bmp_info.m_Height;
    while( 1 )
    {
    	memset( buf_line, 0x00, sizeof( buf_line ));
    	fread( buf_line, 1, line_size, srcfp );
    	if( fseek( bmpfp, data_offset, 0 ) == -1 )
    	{
    		break;
    	}
    	write( bmpfp, buf_line, sizeof( buf_line ));
    	if( feof( srcfp ))
    	{
    		break;
    	}
    	data_offset -= sizeof( buf_line );
    }
    fclose( bmpfp );
    fclose( srcfp );
}