C语言pcx文件显示不出来

angelcm51 2008-04-27 04:07:25

#include<io.h>

#include<stdio.h>

#include<dos.h>

#include<string.h>

#include<math.h>

#include<stdio.h>

#include<bios.h>

#include<mem.h>

#include<fcntl.h>

#include<stdlib.h>

#include<conio.h>



#define SCREEN_HEIGHT 200

#define SCREEN_WIDTH 320

#define PALETTE_MASK 0x3c6

#define PALETTE_REGISTER_RD 0x3c7

#define PALETTE_REGISTER_WR 0x3c8

#define PALETTE_DATA 0x3c9



#define VGA256 0x13

#define TEXT_MODE 0x03

unsigned char far *video_buffer=(char far *)0xA0000000L;

typedef struct pcx_header_typ

	{

	char manufacturer;

	char version;

	char encoding;

	char bits_per_pixel;

	int x,y;

	int width,height;

	int horz_res;

	int vert_res;

	char ega_palette[48];

	char reserved;

	char num_color_planes;

	int bytes_per_line;

	int palette_type;

	char padding[58];



	} pcx_header, *pcx_header_ptr;



typedef struct RGB_color_typ

{

unsigned char red;

unsigned char green;

unsigned char blue;

}RGB_color,*RGB_color_ptr;







typedef struct pcx_picture_typ

	{

	pcx_header header;

	RGB_color palette[256];

	char far *buffer;



	} pcx_picture, *pcx_picture_ptr;





void Set_Palette_Register(int index,RGB_color_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 PCX_Load_Screen(char *filename,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;

RGB_color palette[256];

// open the file





fp = fopen("tu.pcx","rb");





fseek(fp,128L,SEEK_SET);

// load the data and decompress into buffer

count=0;





while(count<=(unsigned int)SCREEN_WIDTH * SCREEN_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

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

    {

    // get the red component



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



    // get the green component



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



    // get the blue component



    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)&palette[index]);



       } // end for index



   } // end if change palette



} // end PCX_Load



void Set_Video_Mode(int mode)

{

	union REGS inregs,outregs;

	inregs.h.ah=0;

	inregs.h.al=(unsigned char)mode;

	int86(0x10,&inregs,&outregs);

}







void main(void)

{

char *pcx="poem.pcx";

Set_Video_Mode(VGA256);

PCX_Load_Screen(pcx,1);

getch();

Set_Video_Mode(TEXT_MODE);



}