RGB565转BMP格式 C语言程序

只看该作者 · 2018-9-15 10:04

以前做过一个项目，就是从屏幕上抓图片下来。我先把RGB图片转BMP的程序分享给大家，这个程序可以在LINUX 系统下执行。压缩包中有750K的RGB 文件，也有1126K的已转化文件。大家可以自己试试。tu0 tu1 tu3 zzz.txt都是原始图片  .bmp的是经过a.out 转化过后的输出文件。我是从某火的429开发板的配套屏幕上截取的图，用的是某火配套的摄像头模块。

单片机源程序如下:

#include<string.h>

#include<stdlib.h>

#include<stdio.h>

#include&quot;rgb2bmp.h&quot;

int RGB2BMP(char *,int ,int ,FILE *);

int main(int argc,char *argv[]){

      double  num_tmp = 0;

      FILE *p;

/***************  input data  ***********

filename    :RGB数据文件名称

nWidth       :所生成文件的水平像素

nHeight    :所生成文件的垂直像素

newFile    :最终生成文件的名称

**********************************************/

      size_t read_size;

      size_t write_size;

      printf(&quot;argv[1]= %s\n&quot;,argv[1]);

      printf(&quot;argv[2]= %s\n&quot;,argv[2]);

      char * filename = &quot;rgb565_800_480_woman&quot;;

      int nWidth = 800;

      int nHeight = 480;

      char *newFile = &quot;rgb565_800_480_woman_0x7f.bmp&quot;;

      if(argc!=3){

            printf(&quot;Usage:./a.out <picturename> <newpicturename.bmp>\n&quot;);

            return -1;

      }

      filename = argv[1];

      newFile = argv[2];

      p = fopen(filename,&quot;rb&quot;);

      if( p == NULL){

            printf(&quot;open file %s error \n&quot;,filename);

            return 0;

      }

      printf(&quot;open file %s success\n&quot;,filename);

/*************** read Image Data **********/

      long nData = nWidth *nHeight;

      unsigned short * rgb_buffer = malloc(nData * sizeof(short));

      //read_size = fread(rgb_buffer,2,nData,p);

      //printf(&quot;rgb_buffer[384000] = %d\n&quot;,*(rgb_buffer+383980));

      read_size = fread(rgb_buffer,2,384000,p);

      //printf(&quot;rgb_buffer[384000] = %d\n&quot;,*(rgb_buffer+383980));

      printf(&quot;fread 读取到的字节数是　%ld\n&quot;,read_size);

      unsigned long total = nWidth*nHeight*3;

      unsigned char *pVisit = malloc(total*sizeof(char));

      unsigned char *tmp = pVisit;

      long i = 0;

      unsigned char R,G,B;

      unsigned short *free1= rgb_buffer;

      unsigned char *free2= pVisit;

      while(i<nData){

            R = *rgb_buffer&0x1f;

            G = (*rgb_buffer>>5)&0x3f;

            B = (*rgb_buffer>>11)&0x1f;

            /*

            B<<3;

            G<<2;

            R<<3;

            */

            num_tmp = R;

            num_tmp/= 31;

            R = num_tmp * 255;

            num_tmp = G;

            num_tmp/= 63;

            G = num_tmp * 255;

            num_tmp = B;

            num_tmp/= 31;

            B = num_tmp * 255;

            *pVisit = R;pVisit++;

            *pVisit = G;pVisit++;

            *pVisit = B;pVisit++;

            rgb_buffer++;

            i++;

      }

      //free(free1);

      printf(&quot;read file over. nData = %ld\n&quot;,nData);

      fclose(p);

      p = NULL;

      /*************************************/

      /**************** write file *********/

      FILE *result = fopen(newFile,&quot;wb&quot;);

      if(result == NULL){

            printf(&quot;open new file failed&quot;);

            return -1;

      }

      RGB2BMP(tmp,nWidth,nHeight,result);

      printf(&quot;total = %ld\n&quot;,total);

      /*

      write_size =  fwrite(((char *)pVisit),1,total/3,result);

      printf(&quot;write_size = %ld \n&quot;,write_size);

      write_size =  fwrite(((char *)pVisit)+total/3,1,total/3,result);

      printf(&quot;write_size = %ld \n&quot;,write_size);

      write_size =  fwrite(((char *)pVisit)+total/3*2,1,total/3,result);

      */

      write_size =  fwrite(free2,1,1152000,result);

      printf(&quot;write_size = %ld \n&quot;,write_size);

      /*

      write_size =  fwrite(pVisit+752000,1,500000,result);

      printf(&quot;write_size = %ld \n&quot;,write_size);

      */

      fclose(result);

      result = NULL;

      free(free2);

      return 0;

}

int RGB2BMP(char *rgb_buffer,int nWidth,int nHeight,FILE *fp1){

      BmpHead m_BMPHeader;

      char bfType[2] = {'B','M'};

      m_BMPHeader.imageSize = 3*nWidth*nHeight + 54;

      m_BMPHeader.blank=0;

      m_BMPHeader.startPosition=54;

      //m_BMPHeader.startPosition=1078;

      fwrite(bfType,sizeof(bfType),1,fp1);

      fwrite(&m_BMPHeader.imageSize,sizeof(m_BMPHeader.imageSize),1,fp1);

      fwrite(&m_BMPHeader.blank,sizeof(m_BMPHeader.blank),1,fp1);

      fwrite(&m_BMPHeader.startPosition,sizeof(m_BMPHeader.startPosition),1,fp1);

      InfoHead m_BMPInfoHeader;

      m_BMPInfoHeader.Length=40;

      m_BMPInfoHeader.width = nWidth;

      m_BMPInfoHeader.height = nHeight;

      m_BMPInfoHeader.colorPlane = 1;

      m_BMPInfoHeader.bitColor = 24;

      m_BMPInfoHeader.zipFormat = 0;

      m_BMPInfoHeader.realSize = 3*nHeight*nWidth;

      m_BMPInfoHeader.xPels=2835;

      m_BMPInfoHeader.yPels=2835;

      m_BMPInfoHeader.colorUse=0;

      m_BMPInfoHeader.colorImportant=0;

      fwrite(&m_BMPInfoHeader.Length,sizeof(m_BMPInfoHeader.Length),1,fp1);

      fwrite(&m_BMPInfoHeader.width,sizeof(m_BMPInfoHeader.width),1,fp1);

      fwrite(&m_BMPInfoHeader.height,sizeof(m_BMPInfoHeader.height),1,fp1);

      fwrite(&m_BMPInfoHeader.colorPlane,sizeof(m_BMPInfoHeader.colorPlane),1,fp1);

      fwrite(&m_BMPInfoHeader.bitColor,sizeof(m_BMPInfoHeader.bitColor),1,fp1);

      fwrite(&m_BMPInfoHeader.zipFormat,sizeof(m_BMPInfoHeader.zipFormat),1,fp1);

      fwrite(&m_BMPInfoHeader.realSize,sizeof(m_BMPInfoHeader.realSize),1,fp1);

      fwrite(&m_BMPInfoHeader.xPels,sizeof(m_BMPInfoHeader.xPels),1,fp1);

      fwrite(&m_BMPInfoHeader.yPels,sizeof(m_BMPInfoHeader.yPels),1,fp1);

      fwrite(&m_BMPInfoHeader.colorUse,sizeof(m_BMPInfoHeader.colorUse),1,fp1);

      fwrite(&m_BMPInfoHeader.colorImportant,sizeof(m_BMPInfoHeader.colorImportant),1,fp1);

      return 0;

}

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RGB2.zip

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