bmp.h

c游戏编程从入门到精通_全部源代码和文档

typedef struct BMP_file
{
	unsigned int bfType;
	unsigned long bfSize;
	unsigned int Reserved1;
	unsigned int reserved2;
	unsigned long bfOffset;
}
bitmapfile;

typedef struct BMP_info
{
	unsigned long biSize;
	unsigned long biWidth;
	unsigned long biHeight;
	unsigned int biPlanes;
	unsigned int biBitCount;
	unsigned long biCompression;
	unsigned long biSizeImage;
	unsigned long biXpolsPerMeter;
	unsigned long biYpelsPerMeter;
	unsigned long biClrUsed;
	unsigned long biClrImportant;
}
bitmapinfo;


typedef struct RGB_BMP_typ
{
unsigned char blue;
unsigned char green;
unsigned char red;
unsigned char reserved;
}RGB_BMP,*RGB_BMP_ptr;

typedef struct bmp_picture_typ
	{
	bitmapfile file;
	bitmapinfo info;
	RGB_BMP palette[256];
	char far *buffer;

	} bmp_picture, *bmp_picture_ptr;

void Set_BMP_Palette_Register(int index,RGB_BMP_ptr color)
{
outp(PALETTE_MASK,0xff);
outp(PALETTE_REGISTER_WR,index);
outp(PALETTE_DATA,color->red);
outp(PALETTE_DATA,color->green);
outp(PALETTE_DATA,color->blue);
}

void Check_Bmp(bmp_picture_ptr bmp_ptr)
{
if(bmp_ptr->file.bfType!=0x4d42)
{
	printf("Not a BMP file!\n");
exit(1);
}
if(bmp_ptr->info.biCompression!=0)
{
printf("Can not display a compressed BMP file!\n");
exit(1);
}
if(bmp_ptr->info.biBitCount!=8)
{
printf("Not a index 16color BMP file!\n");

exit(1);
}
}


void BMP_Load_Screen(char *bmp)
{
 int i,fp;
 bmp_picture bmp256;
 char *file_name;
 if ((fp=open(bmp,O_RDONLY))==1)
	 return;

 read(fp,&bmp256.file,sizeof(bitmapfile));
 read(fp,&bmp256.info,sizeof(bitmapinfo));

 Check_Bmp((bmp_picture_ptr)&bmp256);//u can ingore it
// lseek(fp,54,0);

 for (i=0;i<256;i++)
 {
  read(fp,&bmp256.palette[i].blue,1);
  read(fp,&bmp256.palette[i].green,1);
  read(fp,&bmp256.palette[i].red,1);
  read(fp,&bmp256.palette[i].reserved,1);
  bmp256.palette[i].blue=bmp256.palette[i].blue>>2;
  bmp256.palette[i].green=bmp256.palette[i].green>>2;
  bmp256.palette[i].red=bmp256.palette[i].red>>2;
 }
 for (i=0;i<256;i++)
   Set_BMP_Palette_Register(i,(RGB_BMP_ptr)&bmp256.palette[i]);

 for(i=SCREEN_HEIGHT-1;i>=0;i--)
 {
	lseek(fp,1078+(long)(SCREEN_HEIGHT-i-1)*SCREEN_WIDTH,0);
	read(fp,&video_buffer[i*SCREEN_WIDTH],SCREEN_WIDTH);
 }
 close(fp);

}


void BMP_Init(bmp_picture_ptr image)
//申请图像大小的内存空间
{
unsigned int a=(unsigned int)(SCREEN_WIDTH * SCREEN_HEIGHT + 1);
if((image->buffer = (char far *)malloc(a))==NULL)
{
   printf("\ncouldn't allocate screen buffer");
 exit(1);
 }
}

void BMP_Delete(bmp_picture_ptr image)
{
free(image->buffer);
}



void BMP_Load(char *bmp, bmp_picture_ptr bmp256)
{
 int i,fp;
 char *file_name;
 if ((fp=open(bmp,O_RDONLY))==1)
	 return;

 read(fp,&bmp256->file,sizeof(bitmapfile));
 read(fp,&bmp256->info,sizeof(bitmapinfo));

 Check_Bmp(bmp256);//u can ingore it
// lseek(fp,54,0);

 for (i=0;i<256;i++)
 {
  read(fp,&bmp256->palette[i].blue,1);
  read(fp,&bmp256->palette[i].green,1);
  read(fp,&bmp256->palette[i].red,1);
  read(fp,&bmp256->palette[i].reserved,1);
  bmp256->palette[i].blue=bmp256->palette[i].blue>>2;
  bmp256->palette[i].green=bmp256->palette[i].green>>2;
  bmp256->palette[i].red=bmp256->palette[i].red>>2;
 }

 for (i=0;i<256;i++)
   Set_BMP_Palette_Register(i,(RGB_BMP_ptr)&bmp256->palette[i]);

 for(i=SCREEN_HEIGHT1-1;i>=0;i--)
 {
	lseek(fp,1078+(long)(SCREEN_HEIGHT1-i-1)*SCREEN_WIDTH,0);
	read(fp,&bmp256->buffer[i*SCREEN_WIDTH],SCREEN_WIDTH);
 }

 close(fp);

}

void BMP_Show_Buffer(bmp_picture_ptr image)
//将内存中的图像显示
{

char far *data;
data=image->buffer;


asm	push ds;
asm	les di,video_buffer;
asm	lds si,data;
asm 	mov cx,SCREEN_HEIGHT*SCREEN_WIDTH/2;
asm 	cld;
asm	rep movsw;
asm	pop ds;

}