64k_test.c

C语言第三方BGI演示

/* Svga64k.bgi 测试文件 */

#include "graphics.h"
#include "Svga64k.h"
#include "stdio.h"
#include "fcntl.h"
#include "malloc.h"
#include "io.h"

int huge Return_SVGA64K(void)
{
 return(0); /* 返回各种分辨率的对应编号 0～6 宏定义参见 Svga64k.h */
}

typedef struct    /*16Mrgb像素类型*/
{unsigned char b;
 unsigned char g;
 unsigned char r;
}rgb16M;

void putpoint65536(int x,int y,rgb16M color)
{
 setrgbpalette(1026,color.r>>3,color.g>>2,color.b>>3);
 putpixel(x,y,0);
}

void main()
{int width,height,i=DETECT,j=0,x0,y0,fp;
 char fix;
 rgb16M *buffer;
 installuserdriver("Svga64K",Return_SVGA64K);/*对于svga64k必需执行该函数以安装BGI驱动*/
 initgraph(&i,&j,"");/* 执行TC默认的BGI初始化函数 */

 if((fp=open("xy_tc.bmp",O_RDONLY|O_BINARY))==-1)
 {puts("Can't find file ""xy_tc.bmp"".");
  exit(1);
 }
 lseek(fp,18,SEEK_SET);
 read(fp,&width,4);
 read(fp,&height,4);
 fix=width%4;
 x0=(320-width)/2;y0=(200-height)/2;
 lseek(fp,54,SEEK_SET);
 buffer=(rgb16M *)malloc(width*sizeof(rgb16M));

 for(j=height-1;j>=0;j--)
 {read(fp,buffer,width*sizeof(rgb16M));
  lseek(fp,fix,SEEK_CUR);
  for(i=0;i<width;i++)
   putpoint65536(x0+i,y0+j,buffer[i]);
 }
 free(buffer);
 close(fp);
 getch();
 closegraph();
}