151.动态显示位图
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#include "stdio.h"
#include "dir.h"
#include "dos.h"
#include "graphics.h"
char *malloc();/*malloc转换*/
char bmp_to_dat(char *bmp,char *dat)
/*将16色BMP文件转换为可以用putimage输出的格式,bmp为原BMP文件,dat为转化文件*/
unsigned char c[8],scan_times,scan_pixs;
unsigned char workpos;int i,j,k,n,nowpos,iw,ih;
static int color[16]=0,4,2,6,1,5,3,7,8,12,10,14,9,13,11,15;
unsigned char workline[640],scanline[640];
FILE *fp,*targetfp;
union
unsigned char value;
struct
unsigned cl:4;
unsigned ch:4;
color;
mycolor;
if((fp=fopen(bmp,"rb"))==NULL)return(0);
targetfp=fopen(dat,"wb");
fseek(fp,18,SEEK_SET);
iw=0;ih=0;
fread(&iw,4,1,fp); /*读图像宽度*/
fread(&ih,4,1,fp); /*读图像高度*/
if(iw==0&&ih==0&&iw>640&&ih>480)
fclose(fp);fclose(targetfp);return(0);
iw--;ih--; /*∵putimage中的长宽比实际数值少1*/
scan_times=iw/8+1; /*行处理单位数*/
scan_pixs=scan_times*4; /*行像素字节数∵1单位=4字节*/
fputc(iw%256,targetfp); /*填充信息头:长、宽部分*/
fputc(iw/256,targetfp);
fputc(ih%256,targetfp);
fputc(ih/256,targetfp);
fseek(fp,-scan_pixs,SEEK_END);
for(j=0;j<=ih;j++)
nowpos=0;
fread(scanline,scan_pixs,1,fp);
fseek(fp,-scan_pixs*2,SEEK_CUR);
for(n=3;n>=0;n--) /*解码4个位面*/
for(i=0;i<scan_times;i++) /*解码各编码单位*/
workpos=0;
for(k=0;k<4;k++) /*分离出8个像素*/
mycolor.value=scanline[i*4+k];
c[k*2]=color[mycolor.color.ch];
c[k*2+1]=color[mycolor.color.cl];
for(k=0;k<8;k++)workpos+=(c[k]>>n&1)<<(7-k);
workline[nowpos]=workpos;nowpos++;
fwrite(workline,scan_pixs,1,targetfp);
fclose(fp);fclose(targetfp);
return(1);
main()
int gd=VGA,gm=VGAHI,n;
char *buffer,bmpfile[13],_16file[13]=0;
FILE *fp;
struct ffblk *ff;
/*registerbgidriver(EGAVGA_driver);*/
initgraph(&gd,&gm,"C:\\\\tc");
printf("Now start to display 16 color bmp.\\n\\n");
puts("Please choice: ");
printf("0. Quit \\n1. BMP file name\\n");
while(1)
n=getch();
switch(n)
case 0 :continue;
case '0':exit(0);
case '1':
printf("Please input BMP file name(*.bmp):");
gets(bmpfile);
goto OUT;
OUT:
strncpy(_16file,bmpfile,strlen(bmpfile)-3);
strcat(_16file,"dat");
if(!bmp_to_dat(bmpfile,_16file))
puts("Can't open file!");
closegraph();
exit(0);
fp=fopen(_16file,"rb");
findfirst(_16file,ff,FA_ARCH);
if((buffer=malloc(ff->ff_fsize))==NULL)exit(0);
n=0;
while(!feof(fp))
buffer[n]=fgetc(fp);
n++;
for(n=0;n<100;n++)
putimage(350-n,n/2,buffer,COPY_PUT);
getch();
closegraph();
free(buffer);
fclose(fp);
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