linux下bmp图像显示

#include <stdio.h> #include <stdlib.h> #include <string.h> #include <malloc.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <unistd.h> #include <assert.h> #include "fbv.h" #include "draw_picture.h" unsigned char * rotate(unsigned char *i, int ox, int oy, int *rot) { unsigned char * n, * p; int x, y; assert(n = (unsigned char*) malloc(ox * oy * 3)); switch(*rot) { case 1: /* 90 deg right */ p = n + (oy - 1) * 3; for(y = 0; y<oy; y++, p -= 3) { unsigned char * r = p; for(x = 0; x<ox; x++, r += oy * 3) { r[0] = *(i++); r[1] = *(i++); r[2] = *(i++); } } break; case 2: /* 180 deg */ i += ox * oy * 3; p = n; for(y = ox * oy; y > 0; y--) { i -= 3; p[0] = i[0]; p[1] = i[1]; p[2] = i[2]; p += 3; } break; case 3: /* 90 deg left */ p = n; for(y = 0; y<oy; y++, p += 3) { unsigned char * r = p + ((ox * 3) * oy); for(x = 0; x<ox; x++) { r -= oy * 3; r[0] = *(i++); r[1] = *(i++); r[2] = *(i++); } } break; } return(n); } static inline void do_rotate(struct image *i, int *rot) { if(*rot) { unsigned char *image, *alpha = NULL; int t; image = rotate(i->rgb, i->width, i->height, rot); if(i->do_free) { free(i->alpha); free(i->rgb); } i->rgb = image; i->alpha = alpha; i->do_free = 1; if(*rot & 1) { t = i->width; i->width = i->height; i->height = t; } } } void help(char *name) { printf("Usage: %s image x_offs y_offs rotate...\n\n" "Available options:\n" " --help | -h : Show this help\n" " 1 : Rotate the image 90 degrees right\n" " 2 : Rotate the image 90 degrees left\n" " 3 : Rotate the image 180 degrees\n" "Copyright (C) 2012,fzxy.\n", name); } int bmp_show(char*filename,int*x_offs,int*y_offs,int *rot) { int x,y,bpp; unsigned char *alpha = NULL; unsigned char *buff = NULL; struct image i; fh_bmp_getsize(filename,&x,&y); buff = (unsigned char*)malloc(x*y*3); fh_bmp_load(filename,buff,&alpha,x,y,&bpp); i.width = x; i.height = y; i.rgb = buff; i.alpha = alpha; i.do_free = 0; if(rot!=0)do_rotate(&i,rot); bmp_display(i.rgb,i.width,i.height,x_offs,y_offs,bpp); free(alpha); free(buff); return 0; } int jpeg_show(char*filename,int*x_offs,int*y_offs,int *rot) { /* int x,y; unsigned char *alpha = NULL; unsigned char *buff = NULL; struct image i; fh_jpeg_getsize(filename,&x,&y); buff = (unsigned char*)malloc(x*y*3); fh_jpeg_load(filename,buff,&alpha,x,y); i.width = x; i.height = y; i.rgb = buff; i.alpha = alpha; i.do_free = 0; if(rot!=0)do_rotate(&i,rot); jpeg_display(i.rgb, i.alpha, i.width, i.height, x_offs,y_offs); free(alpha); free(buff); */ return 0; } int gif_show(char*filename,int*x_offs,int*y_offs,int *rot) {/* int x,y; unsigned char *alpha = NULL; unsigned char *buff = NULL; struct image i; fh_gif_getsize(filename,&x,&y); buff = (unsigned char*)malloc(x*y*3); fh_gif_load(filename,buff,&alpha,x,y); i.width = x; i.height = y; i.rgb = buff; i.alpha = alpha; i.do_free = 0; if(rot!=0)do_rotate(&i,rot); gif_display(i.rgb, i.alpha, i.width, i.height, x_offs,y_offs); free(alpha); free(buff); */ return 0; } int png_show(char*filename,int*offs,int*y_offs,int *rot) { /*int x,y; unsigned char *alpha = NULL; unsigned char *buff = NULL; struct image i; fh_png_getsize(filename,&x,&y); buff = (unsigned char*)malloc(x*y*3); fh_png_load(filename,buff,&alpha,x,y); i.width = x; i.height = y; i.rgb = buff; i.alpha = alpha; i.do_free = 0; if(rot!=0)do_rotate(&i,rot); png_display(i.rgb, i.alpha, i.width, i.height,x_offs,y_offs); free(alpha); free(buff);*/ return 0; } int read_header(char*filename) { int fd; unsigned char bmp_id[2],gif_id[4],png_id[4],jpeg_id[10]; fd=open(filename,O_RDONLY); if(fd==-1) return(0); read(fd,bmp_id,2); lseek(fd,0,SEEK_SET); read(fd,gif_id,4); lseek(fd,0,SEEK_SET); read(fd,png_id,4); lseek(fd,0,SEEK_SET); read(fd,jpeg_id,10); close(fd); if ( bmp_id[0]=='B' && bmp_id[1]=='M' ){ printf("I'm BMP picture!\n");return 1;} else if(gif_id[0]=='G' && gif_id[1]=='I' && gif_id[2]=='F'){ printf("I'm GIF picture!\n");return 2;} else if(png_id[1]=='P' && png_id[2]=='N' && png_id[3]=='G'){ printf("I'm PNG picture!\n");return 3;} else { if(jpeg_id[6]=='J' && jpeg_id[7]=='F' && jpeg_id[8]=='I' && jpeg_id[9]=='F'){ printf("I'm JPEG picture!\n");return 4;} else if(jpeg_id[0]==0xff && jpeg_id[1]==0xd8 && jpeg_id[2]==0xff){ printf("I'm JPEG picture!\n");return 4;} } return 0; } int show_pic(char*filename,int*x_offs,int*y_offs,int *rot ) { int type = read_header(filename); switch(type) { case 1:bmp_show(filename,x_offs,y_offs,rot);break; case 2:gif_show(filename,x_offs,y_offs,rot);break; case 3:png_show(filename,x_offs,y_offs,rot);break; case 4:jpeg_show(filename,x_offs,y_offs,rot);break; default: printf("Cannot identify the type of the picture!\nPlease check your pictures����\n"); break; } return 0; }