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joko |
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/* Betriebssystem & Middleware |
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* |
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* Betriebssystemarchitektur SS 2006 |
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* |
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* Uebung 4.4 |
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*/ |
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#include <stdio.h> |
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#include <errno.h> |
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#define XSIZE 500 |
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#define YSIZE 500 |
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#include "algorithm.h" |
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/* BMP Header |
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unsigned char header[54]={0x42,0x4d, // signature BM |
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0xe6,0x71,0x0b,0x0, // filesize 750054 |
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0x0,0x0,0x0,0x0, // reserved |
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0x36,0x0,0x0,0x0, // image offset 54 |
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0x28,0x0,0x0,0x0, // size of header follows 40 |
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0xf4,0x1,0x0,0x0, // with of image 500 |
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0xf4,0x1,0x0,0x0, // height of image 500 |
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0x1,0x0, // number of planes 1 |
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0x18,0x0, // number of pixel 24 |
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0x0,0x0,0x0,0x0, // compression |
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0xb0,0x71,0x0b,0x0, // size of image 750000 |
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0x0,0x0,0x0,0x0, // xres |
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0x0,0x0,0x0,0x0, // yres |
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0x0,0x0,0x0,0x0, // number of colortables |
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0x0,0x0,0x0,0x0 // number of important colors |
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}; |
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*/ |
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int main(int argc, char *argv[]) |
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{ |
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FILE *fd; |
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int len,x,y; |
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char bgr[3]; |
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short svalue; |
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int lvalue; |
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unsigned char header[54],*ptr=&header[0]; |
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fd=fopen("test.bmp","wb+"); |
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if(NULL==fd) |
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{ |
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perror("open"); exit(1); |
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} |
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/* Der folgende Abschnitt dient nur zur information und kann durch |
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schreiben der auskommentierten Variable header ersetzt werden */ |
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svalue=0x4d42; |
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memcpy(ptr,&svalue,2);//signatur |
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ptr+=2; |
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lvalue=XSIZE*YSIZE*3+54; |
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memcpy(ptr,&lvalue,4); //filesize |
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ptr+=4; |
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lvalue=0; |
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memcpy(ptr,&lvalue,4);//reserved |
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ptr+=4; |
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lvalue=54; |
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memcpy(ptr,&lvalue,4);//image offset |
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ptr+=4; |
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lvalue=40; |
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memcpy(ptr,&lvalue,4);//size of header follows |
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ptr+=4; |
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lvalue=XSIZE; |
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memcpy(ptr,&lvalue,4);//with of image |
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ptr+=4; |
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lvalue=YSIZE; |
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memcpy(ptr,&lvalue,4); //height of image |
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ptr+=4; |
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svalue=1; |
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memcpy(ptr,&svalue,2); //number of planes |
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ptr+=2; |
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svalue=24; |
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memcpy(ptr,&svalue,2); //number of pixel |
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ptr+=2; |
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lvalue=0; //compression |
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memcpy(ptr,&lvalue,4); //compression |
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ptr+=4; |
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lvalue=XSIZE*YSIZE*3; |
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memcpy(ptr,&lvalue,4); //size of image |
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ptr+=4; |
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lvalue=0; |
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memcpy(ptr,&lvalue,4); //xres |
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ptr+=4; |
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lvalue=0; |
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memcpy(ptr,&lvalue,4); //yres |
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ptr+=4; |
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lvalue=0; |
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memcpy(ptr,&lvalue,4); //number of colortables |
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ptr+=4; |
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lvalue=0; |
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memcpy(ptr,&lvalue,4); //number of important colors |
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ptr+=4; |
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/* Ende Information */ |
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len=fwrite(header,1,sizeof(header),fd); //write header |
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if(-1==len || len!=sizeof(header)) |
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{ |
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perror("write"); |
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exit(2); |
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} |
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for(y=YSIZE-1;y>=0;y--) |
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{ |
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for(x=0;x<XSIZE;x++) |
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{ |
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getColorValuesAt(x * (2.0 / XSIZE) - 1.5, y * (2.0 / YSIZE) - 1.0,&bgr[2],&bgr[1],&bgr[0]); |
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len=fwrite(bgr,1,3,fd); |
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if(-1==len || len!=3) |
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{ |
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perror("write"); |
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exit(4); |
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} |
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} |
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/*no padding required because 1500%4 =0*/ |
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} |
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fclose(fd); |
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} |
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