move.h

c游戏编程从入门到精通_全部源代码和文档

#define SCROLL_WIDTH (unsigned int)640
#define SCROLL_HEIGHT (unsigned int)50

void PCX_Init_Scroll(pcx_picture_ptr image)
{
unsigned int a=(unsigned int)SCROLL_WIDTH * SCROLL_HEIGHT + 1;
// this function allocates the buffer region needed to load a pcx file
if((image->buffer = (char far *)malloc(a))==NULL)
	{
   printf("\ncouldn't allocate screen buffer");
exit(1);
}
} // end PCX_Init

void PCX_Load_Scroll(char *filename, pcx_picture_ptr image,int enable_palette)
{
// this function loads a pcx file into a picture structure, the actual image
// data for the pcx file is decompressed and expanded into a secondary buffer
// within the picture structure, the separate images can be grabbed from this
// buffer later.  also the header and palette are loaded

FILE *fp;
int num_bytes,index;
unsigned int count;
unsigned char data;
char far *temp_buffer;

// open the file

fp = fopen(filename,"rb");

// load the header

temp_buffer = (char far *)image;

for (index=0; index<128; index++)
    {
    temp_buffer[index] = getc(fp);
    } // end for index

// load the data and decompress into buffer
count=0;


while(count<=(unsigned int)SCROLL_WIDTH * SCROLL_HEIGHT)
	 {
	 // get the first piece of data

	 data = getc(fp);

	 // is this a rle?

     if (data>=192 && data<=255)
	{
	// how many bytes in run?

	num_bytes = data-192;

	// get the actual data for the run

	data  = getc(fp);

		// replicate data in buffer num_bytes times

	while(num_bytes-->0)
	     {
	    image->buffer[count++] = data;
//  video_buffer[count++]=data;
	     } // end while

	} // end if rle
     else
	{
	// actual data, just copy it into buffer at next location

	image->buffer[count++] = data;
	  //video_buffer[count++]=data;
	} // end else not rle

     } // end while

// move to end of file then back up 768 bytes i.e. to begining of palette

fseek(fp,-768L,SEEK_END);

// load the pallete into the palette

for (index=0; index<256; index++)
    {
    // get the red component

    image->palette[index].red   = (getc(fp) >> 2);

    // get the green component

    image->palette[index].green = (getc(fp) >> 2);

    // get the blue component

    image->palette[index].blue  = (getc(fp) >> 2);

    } // end for index

fclose(fp);

// change the palette to newly loaded palette if commanded to do so

if (enable_palette)
   {

   for (index=0; index<256; index++)
       {

       Set_Palette_Register(index,(RGB_color_ptr)&image->palette[index]);

       } // end for index

   } // end if change palette

} // end PCX_Load

//////////////////////////////////////////////////////////////////////////////
void Show_View_Port_Pcx(pcx_picture_ptr background_pcx,int pos)
{
unsigned int y,scroll_off,screen_off,flag=0;
if((pos+320)>=SCROLL_WIDTH)
flag=1;
for(y=0;y<SCROLL_HEIGHT;y++)
{
scroll_off=((y<<9)+(y<<7)+pos);

screen_off=(((y+150)<<8)+((y+150)<<6));

if(flag==0)
_fmemmove((void far *)&video_buffer[screen_off],
(void far *)&background_pcx->buffer[scroll_off],320);
else
{
_fmemmove((void far *)&video_buffer[screen_off],
(void far *)&background_pcx->buffer[scroll_off],640-pos);
_fmemmove((void far *)&video_buffer[screen_off+640-pos],
(void far *)&background_pcx->buffer[scroll_off-pos],pos-320);
}
}
}

void Show_View_Port_Pcx_Left(pcx_picture_ptr background_pcx,int pos)
{
unsigned int y,scroll_off_left,screen_off_left,flag=0;
for(y=0;y<SCROLL_HEIGHT;y++)
{
scroll_off_left=((y<<9)+(y<<7)+pos);

screen_off_left=(((y+150)<<8)+((y+150)<<6)+319);

video_buffer[screen_off_left]=background_pcx->buffer[scroll_off_left];
}
}

void Move_Screen_Left(int step)
{
unsigned int first=320*150,x,y;
for(y=0;y<50*320;y=y+320)
	for(x=0;x<319;x++)
		video_buffer[first+y+x]=video_buffer[first+1+y+x];
}