#include "ReadBMP.h"
BitMap::BitMap ()
{
memset(&fileHeader,0,sizeof(BITMAPFILEHEADER));
fileHeader.bfSize =sizeof(BITMAPFILEHEADER);
memset(&infoHeader,0,sizeof(BITMAPINFOHEADER));
infoHeader.biSize =sizeof(BITMAPINFOHEADER);
pColortable=NULL;
buffer=NULL;
width=0;
height=0;
biBitCount=0;
bmpName=NULL;
}
BitMap::~BitMap ()
{
if(buffer!=NULL)
{
delete buffer;
buffer=NULL;
}
if(biBitCount==8)
delete []pColortable;
if(bmpName!=NULL)
{
delete bmpName;
bmpName=NULL;
}
}
bool BitMap::ReadBMP(const char *bmpname)
{
//二进制读方式打开指定的图像文件
FILE *fp=fopen(bmpname,"rb");
if(fp==0) return 0;
//跳过位图文件头结构BITMAPFILEHEADER
//fseek(fp, sizeof(BITMAPFILEHEADER),0);
fread(&fileHeader,sizeof(BITMAPFILEHEADER),1,fp);
//定义位图信息头结构变量，读取位图信息头进内存，存放在变量head中
fread(&infoHeader, sizeof(BITMAPINFOHEADER), 1,fp);
//获取图像宽、高、每像素所占位数等信息
width = infoHeader.biWidth;
height = infoHeader.biHeight;
biBitCount = infoHeader.biBitCount;
//灰度图像有颜色表，且颜色表表项为256
if(biBitCount==8){
//申请颜色表所需要的空间，读颜色表进内存
pColortable=new RGBQUAD[256];
fread(pColortable,sizeof(RGBQUAD),256,fp);
}
int lineByte=(width*biBitCount/8+3)/4*4;
//申请位图数据所需要的空间，读位图数据进内存
buffer=new unsigned char[lineByte*infoHeader.biHeight ];
fread(buffer,1,lineByte*infoHeader.biHeight ,fp);
//关闭文件
fclose(fp);
bmpName=new unsigned char[strlen(bmpname)+1];
strcpy((char*)bmpName,bmpname);
return 1;
}
bool BitMap::SaveBMP(const char* copyName)
{
if(!buffer)
return 0;
int colortablesize=0;
if(biBitCount==8)
colortablesize=1024;
int lineByte=(width*biBitCount/8+3)/4*4;
FILE *fp=fopen(copyName,"wb");
if(fopen==NULL) return 0;
//位图文件头
fileHeader.bfType=0x4D42;
fileHeader.bfSize=sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+colortablesize+height*lineByte;
fileHeader.bfReserved1=0;
fileHeader.bfReserved2=0;
fileHeader.bfOffBits=54+colortablesize;
fwrite(&fileHeader,sizeof(BITMAPFILEHEADER),1,fp);
//位图信息头
infoHeader.biSize=40;
infoHeader.biWidth=width;
infoHeader.biHeight=height;
infoHeader.biPlanes=1;
infoHeader.biBitCount=biBitCount;
infoHeader.biCompression=0;
infoHeader.biSizeImage=height*lineByte;
infoHeader.biXPelsPerMeter=0;
infoHeader.biYPelsPerMeter=0;
infoHeader.biClrUsed=0;
infoHeader.biClrImportant=0;
fwrite(&infoHeader,sizeof(BITMAPINFOHEADER),1,fp);
//颜色表
if(biBitCount==8)
fwrite(pColortable,sizeof(RGBQUAD),256,fp);
//位图数据
fwrite(buffer,height*lineByte,1,fp);
fclose(fp);
return 1;
}
int BitMap::GetBiBitCount()
{
return biBitCount;
}
int BitMap::GetHeight()
{
return height;
}
unsigned char* BitMap::GetName()
{
return bmpName;
}
int BitMap::GetWidth()
{
return width;
}
int BitMap::GetLineByte()
{
return (width*biBitCount/8+3)/4*4;
}
unsigned char* BitMap::GetBuffer()
{
return buffer;
}
