graybmp.c

可采集MBF指纹传感器图像

//#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>
#include "graybmp.h"
#include <assert.h>
#define GRAYBMP_HEADSIZE 1078

;
const unsigned char BitmapFlag[2]={'B','M'};
typedef struct tagBMPH{
	unsigned long  bfSize;
	unsigned short bfReserved1;
	unsigned short bfReserved2;
	unsigned long  bfOffBits;
}BMPH;

typedef struct tagBMPI{
	unsigned long  biSize;
	unsigned long  biWidth;
	unsigned long  biHeight;
	unsigned short biPlanes;
	unsigned short biBitCount;
	unsigned long  biCompression;
	unsigned long  biSizeImage;
	unsigned long  biXPelsPerMeter;
	unsigned long  biYPelsPerMeter;
	unsigned long  biClrUsed;
	unsigned long  biClrImportant;
}BMPI;

typedef struct tagPALETTE{
	unsigned char rgbRed;
	unsigned char rgbGreen;
	unsigned char rgbBlue;
	unsigned char rgbReserved;
}PALETTE;


int WriteGrayBMPFile(char *filename,unsigned char *tempdata, unsigned int width,unsigned int height)
{
	int i,j;

	FILE *fp;	
	BMPH bitMFH;
	BMPI bitMIH;
	PALETTE RgbQuad;
	if((fp=fopen(filename,"wb"))==NULL)
		return(-1);
	
	fwrite(BitmapFlag,2,1,fp);
	bitMFH.bfSize = width*height +GRAYBMP_HEADSIZE;
	bitMFH.bfReserved1 = 0;
	bitMFH.bfReserved2 = 0;
	bitMFH.bfOffBits = GRAYBMP_HEADSIZE; 
	fwrite(&bitMFH,sizeof(bitMFH),1,fp);

	bitMIH.biSize = 40;
	bitMIH.biWidth = width;
	bitMIH.biHeight = height;
	bitMIH.biPlanes = 1;
	bitMIH.biBitCount = 8;
	bitMIH.biCompression = 0;
	bitMIH.biSizeImage = width*height;
	bitMIH.biXPelsPerMeter = 0;
	bitMIH.biYPelsPerMeter = 0;
	bitMIH.biClrUsed = 0;
	bitMIH.biClrImportant = 0;
	fwrite(&bitMIH,sizeof(bitMIH),1,fp);

	for(i = 0;i<256;i++){
		RgbQuad.rgbRed = i;
		RgbQuad.rgbGreen = i;
		RgbQuad.rgbBlue = i;
		RgbQuad.rgbReserved = i;
		fwrite(&RgbQuad,4,1,fp);
	}
	
	//write the data
	for(i=height-1;i>=0;i--)
		for(j=0;j<width;j++)
			fwrite(tempdata+width*i+j,sizeof(unsigned char),1,fp);
		   
	fclose(fp);
	return 0;
}

void* ReadGrayBMPFile(char *FileName, unsigned int * nwidth, unsigned int *nheight)
{
	FILE *fp;
	int i, j;
	unsigned char temp;
	unsigned char *pImageData;
	int offset, depth, width;

	if((fp=fopen(FileName, "rb"))==NULL)
		return 0;
	fseek(fp, 10, SEEK_SET);
	fread(&offset, sizeof(long), 1, fp);
	fseek(fp, 18, SEEK_SET);
	fread(&width, sizeof(long), 1, fp);
	fread(&depth, sizeof(long), 1, fp);
	if((pImageData=(unsigned char *)malloc(sizeof(unsigned char)*width*depth))==0){
		fclose(fp);
		return 0;
	}
	fseek(fp,offset,SEEK_SET);
	for(i=depth-1; i>=0; i--)
		for(j=0; j<width; j++)	{
			temp=fgetc(fp);
			*(pImageData+i*width+j)=temp;
		}
	
	fclose(fp);
	*nwidth=width;
	*nheight=depth;
	return(pImageData);
}
int SliceGrayBMP(unsigned char * olddata,int oldwidth,int oldheight,unsigned char *newdata,int left,int top,int width,int height)
{
	int i;
	assert(oldwidth>=width+left&&left<=width);
	assert(oldheight>=height+top&&top<=height);

	for(i=0;i<height;i++)
		memcpy(newdata+i*width,olddata+(i+top)*oldwidth+left,width*sizeof(unsigned char));
	return(0);
}