彩屏图像取模,BMP图像提取程序示例
由于屏幕的多种类性, 我始终没有使用市面上的那种取模软件, 我始终感觉数据可能不对.
因为我的屏幕的要求比例是R:G:B(5:6:5),16位色,一个像素2个字节保存,所以总觉得应该自己写
一个来做这种转换工作的软件.
今天写了个小程序,在彩屏上显示出来的效果很好. 程序是为我的屏幕的数据类型量身生成的,
写在这里只是保存一下,不然久了,我又不知道代码之前的版本, 或是又找不到了.
程序解析BMP图像数据到点阵字模(仅支持24位位深的BMP位图,现在大都是这种),生成是数据
是16位的无符号字符型数据数组.直接调用写进屏幕即可显示出来.
代码分两个文件:bmconv.h,bmconv.c
//bmconv.h #ifndef __BMCONV_H__ #define __BMCONV_H__ #pragma pack(push,1) //位图文件头数据 typedef struct _BITMAP_FILE_HEADER{ unsigned char signature[2]; //00~01:文件头签名字节,仅检测'BM'序 unsigned long file_size; //02~05:整个文件的大小 unsigned long _reserved1; //06~09:保留4字节,必须为0 unsigned long data_offset; //0A~0D:位图数据距文件开始的偏移 }BITMAP_FILE_HEADER; //图像信息头数据 typedef struct _BITMAP_INFO_HEADER{ unsigned long header_size; //0E~11:位图信息头的长度,根据文件判断 unsigned long width; //12~15:位图宽度,像素为单位 unsigned long height; //16~19:位图高度,像素为单位 unsigned short planes; //1A~1B:位图的面数,该值总是1 unsigned short bpp; //1C~1D:位深:1,4,8,16,24,32 unsigned long compress; //1E~21:压缩说明 unsigned long data_size; //22~25:数据大小 unsigned long hresolution; //26~29:水平分辨率 unsigned long vresolution; //2A~2D:垂直分辨率 unsigned long colors; //2E:31:使用的颜色数 unsigned long colors_important; //重要的颜色数 }BITMAP_INFO_HEADER; //颜色表 typedef struct _RGBQUAD{ unsigned char blue; unsigned char green; unsigned char red; unsigned char _reserved; }BITMAP_RGB_QUAD; //由图像信息头+颜色表组成的图像信息 typedef struct _BITMAP_INFO{ BITMAP_INFO_HEADER bmih; BITMAP_RGB_QUAD bmcolor; }BITMAP_INFO; #pragma pack(pop) #endif//!__BMCONV_H__
//bmconv.c #include <stdio.h> #include <stdlib.h> #include <string.h> #include "bmconv.h" /************************************************************************* 文件名称:bmconv.c/bmconv.h 文件功能:BMP提取到点阵RGB显示 创建时间:2013-04-20 文件作者:女孩不哭 文件版本:1.0 文件说明:专用 *************************************************************************/ __inline unsigned int myrgb(int a) { unsigned short b = (a&0xff)>>3; unsigned short g = ((a&0xff00)>>10); unsigned short r = ((a&0xff0000)>>19); unsigned int rgb = (b|(g<<5)|(r<<11)); return rgb; } int main(void) { char file[260]; char file_out[260]; char* pstr = NULL; unsigned char* buffer=NULL; char* outout_data = NULL; BITMAP_FILE_HEADER bmfh={0}; BITMAP_INFO_HEADER bmih={0}; FILE* fpin = NULL; FILE* fpout = NULL; size_t size = 0; size_t file_size; printf("输入BMP文件打开路径:"); fgets(file,sizeof(file),stdin); pstr = strrchr(file,'\n'); if(pstr) *pstr = 0; printf("输入BMP文件保存路径:"); fgets(file_out,sizeof(file_out),stdin); pstr = strrchr(file_out,'\n'); if(pstr) *pstr = 0; fpin = fopen(file,"rb"); if(fpin==NULL){ fprintf(stderr,"打开输入文件错误!\n"); return 1; } fpout = fopen(file_out,"wb"); if(fpout==NULL){ fprintf(stderr,"打开输出文件错误!\n"); fclose(fpin); return 1; } fseek(fpin,0,SEEK_END); file_size = ftell(fpin); fseek(fpin,0,SEEK_SET); size = fread(&bmfh,1,sizeof(bmfh),fpin); if(size != sizeof(bmfh)){ fclose(fpin); fprintf(stderr,"读取文件头时错误!\n"); return 1; } if(bmfh.signature[0]!='B' || bmfh.signature[1]!='M'){ fclose(fpin); fprintf(stderr,"不是BMP文件!\n"); return 1; } printf( "文件头结构体大小:%d\n" "文件头签名:\'BM\'\n" "文件大小:%u bytes\n" "保留4字节值:%u\n" "位图数据距文件开始的偏移:%u\n\n",(long)sizeof(bmfh), bmfh.file_size,bmfh._reserved1,bmfh.data_offset); size = fread(&bmih,1,sizeof(bmih),fpin); if(size != sizeof(bmih)){ fclose(fpin); fprintf(stderr,"读取图像信息头错误!\n"); return 1; } printf( "图像信息头结构体大小:%d\n" "图像信息头大小:%d bytes\n" "位图宽度: %u 像素\n" "位图高度: %u 像素\n" "位图面数: %d 面\n" "位深: %d bpp\n" "压缩说明: %d\n" "位图数据大小: %u bytes\n" "水平分辨率: %u 像素/米\n" "垂直分辨率: %u 像素/米\n" "使用的颜色数: %u\n" "重要的颜色数: %u\n\n",(long)sizeof(bmih), bmih.header_size,bmih.width,bmih.height,bmih.planes,bmih.bpp,bmih.compress, bmih.data_size,bmih.hresolution,bmih.vresolution,bmih.colors,bmih.colors_important); //检测文件数据大小是否符合文件头 size = bmih.width*3; size += size%4==0?0:4-size%4; size *= bmih.height; if(size != file_size-bmfh.data_offset){ fprintf(stderr,"位图的数据量与文件头所标识的数据量的长度不一致!\n"); fclose(fpin); return 1; } if(bmih.bpp != 24){ fprintf(stderr,"不是24位位深的BMP位图,不被支持!\n"); fclose(fpin); return 1; } buffer=(unsigned char*)malloc(size); //printf("buffer大小:%d\n",size); if(buffer==NULL){ fprintf(stderr,"分配文件缓冲区时出错!\n"); fclose(fpin); return 1; } if(size != fread(buffer,1,size,fpin)){ fprintf(stderr,"读取位图数据时读取的长度不一致!\n"); free(buffer); fclose(fpin); return 1; } fclose(fpin); //交换上下内存 for(;;){ int bytes_line = size/bmih.height; int rows = bmih.height/2; int it=0; unsigned char* tmp = (unsigned char*)malloc(bytes_line); while(it<rows){ memcpy(tmp,buffer+bytes_line*it,bytes_line); memcpy(buffer+bytes_line*it,buffer+(bmih.height-1-it)*bytes_line,bytes_line); memcpy(buffer+(bmih.height-1-it)*bytes_line,tmp,bytes_line); it++; } free(tmp); break; } //总像素点个数(一个像素3个字节),3个字节转换成2个字节,2个字节转成字符串需要7个字节空间(0x0000,) //每行后面1个换行符(每行16个"0x0000,",2个字节),字符串开始的结束的字符串("unsigned char image[] = {" + 换行 + "};" for(;;){ size_t pixels = bmih.width*bmih.height; size_t str_length = pixels*7; size_t crlf_count = pixels/16 + (pixels%16==0?0:1); size_t prefix_length = sizeof("unsigned short image[] = {\r\n")-1 + sizeof("};\r\n")-1; size_t total = str_length+crlf_count*2+prefix_length+1; outout_data = (char*)malloc(total); //printf("str:%d,crlf:%d,prefix:%d,total::%d\n",str_length,crlf_count*2,prefix_length,total); if(outout_data == NULL){ fprintf(stderr,"申请保存数据用的缓冲区失败!\n"); free(buffer); return 1; } printf("正在生成数据...\n"); for(;;){ char* ptr = outout_data; unsigned char* pbuf = buffer; int count = 0; unsigned long lines; int skip = (bmih.width*3%4)?(4-bmih.width*3%4):0; int len; len=sprintf(ptr,"unsigned short image[] = {\r\n"); ptr += len; for(lines=0;lines<bmih.height;){ len=sprintf(ptr,"0x%04X,",(unsigned short)myrgb(*(int*)pbuf)); ptr += len; count++; if(count == 16){ count = 0; len=sprintf(ptr,"\r\n"); ptr += len; } pbuf += 3; if((unsigned long)pbuf-(unsigned long)buffer-lines*skip == bmih.width*3*(lines+1)){ pbuf += skip; lines++; } } if(count==0){ ptr -= 3; len=sprintf(ptr,"\r\n"); ptr+=len; }else{ --ptr; len=sprintf(ptr,"\r\n"); ptr += len; } len=sprintf(ptr,"};\r\n"); ptr += len; printf("生成成功!\n"); //printf("结尾指针:pbuf-buffer=%d,ptr-outout_data=%d\n",pbuf-buffer,ptr-outout_data); len=fwrite(outout_data,1,(unsigned long)ptr-(unsigned long)outout_data,fpout); if(len != (unsigned long)ptr-(unsigned long)outout_data){ fprintf(stderr,"写入数据的长度不等于待写入的要求!\n"); }else{ printf("已全部保存到文件!\n"); } fclose(fpout); free(buffer); free(outout_data); break; } break; } return 0; }
软件运行过程:
最终生成的数据像这种:
unsigned short image[] = { 0xDF9F,0xC75F,0xA71F,0x7EBF,0x667F,0x4E3F,0x3E1F,0x35FF, 0x35FF,0x35FF,0x35FF,0x35FF,0x35FF,0x35FF,0x35FF,0x35FF, 0x463F,0x461F,0x3E1F,0x6E7F,0xA6FF,0xCF7F,0xDF9F,0xC75F, 0x35FF,0x35FF,0x35FF,0x35FF,0x35FF,0x35FF,0x35FF,0x35FF, 0x35FF,0x35FF,0x35FF,0x35FF,0x35FF,0x35FF,0x35FF,0x35FF, 0x35FF,0x35FF,0x35FF,0x35FF,0x35FF,0x35FF,0x35FF,0x35FF, 0x35FF,0x35FF,0x35FF,0x35FF,0x35FF,0x35FF,0x35FF,0x35FF, 0x35FF,0x35FF,0x35FF,0x35FF,0x35FF,0x35FF,0x35FF,0x35FF, 0x35FF,0x35FF,0x35FF,0x35FF,0x35FF,0x35FF,0x35FF,0x35FF };
源代码及程序: http://blog.twofei.com/files/512/bmconv.7z
哈哈,自己写的软件,用得放心.
女孩不哭 @ 2013-04-21 00:04:14 @ http://www.cnblogs.com/nbsofer
