bmp图片合并算法

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我是靠谱客的博主粗暴大炮，最近开发中收集的这篇文章主要介绍bmp图片合并算法，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

用到的数据结构如下:

 //一个方框 
 structRectItem 
{
 unsignedintx;//方框在合并后的图片的x坐标 
 unsignedinty;//方框在合并后的图片的y坐标 
 unsignedintwidth;//方框的宽 
 unsignedintheight;//方框的高 
};
 //一张图片 
 structImageItem 
{
 unsignedintid;//图片item的ID 
 unsignedintx;//图片item在合并后的图片的x坐标 
 unsignedinty;//图片item在合并后的图片的y坐标 
 charfilename[256];//图片名字 
 BITMAPbmp;//BITMAP结构,只用于到高宽 
 HBITMAPhbmp;//图片handle,借用windowsAPI合并图片 
};
 //图片列表 
 classImageList 
{
 public: 
 voidInsert(CStringstrPath); 
ImageList();
~ImageList();
 intGetMaxHeight(); 
 intGetMaxWidth(); 
 BOOLmerge(CStringoutfile);//生成合并后的图片 
 voidInitFromStringArray(CString*pStr,intcount); 
 voidLoadFromIni(CStringstrPath); 
 voidSaveToIni(CStringstrPath); 
 intGetImageCount(); 
 ImageItemimages[128];//待合并的图片数组 
 private: 
 voidMyBitBlt(intindex);//计算出images[index]在合并后图片的坐标 
 voidDeleteRectItem(intindex); 
 voidInsertRectItem(RectItem*item); 
 voidclean(); 
 RectItemrects[256];//合并时产生的空隙(方框)数组 
 intmerge_image_width;//合并后图片的宽,实际上是等于要合并的图片中宽最大的图片的宽 
 intmerge_image_height;//合并后图片的高 
 intm_imageCount;//待合并的图片数 
 intm_rectCount;//空隙(方框)方框数 
};
 externImageListGlobalImageList; 

cpp文件如下:

ImageList::ImageList()
{
 memset(images,0,sizeof(images)); 
 memset(rects,0,sizeof(rects)); 
m_imageCount=0;
m_rectCount=0;
merge_image_width=0;
merge_image_height=0;
}
ImageList::~ImageList()
{
clean();
}
 intImageList::GetImageCount() 
{
 returnm_imageCount; 
}
 voidImageList::Insert(CStringstrPath) 
{
ImageItemitem;
 item.hbmp=(HBITMAP)LoadImage(AfxGetInstanceHandle(), 
 (LPCTSTR)strPath, 
IMAGE_BITMAP,
0,
0,
LR_LOADFROMFILE);
 if(item.hbmp==NULL) 
{
CStringstr;
 str.Format("无法打开指定的图片:%s",strPath); 
AfxMessageBox(str);
 }else 
{
 GetObject(item.hbmp,sizeof(BITMAP),&item.bmp); 
}
 //memset(images[m_imageCount].filename,0,sizeof(images[m_imageCount].filename); 
strcpy(item.filename,strPath.GetBuffer(strPath.GetLength()));
 //对images进行排序 
 for(inti=0;i<m_imageCount;i++) 
{
 if(item.bmp.bmWidth>images[i].bmp.bmWidth) 
 break; 
 if(item.bmp.bmWidth==images[i].bmp.bmWidth&&item.bmp.bmHeight>images[i].bmp.bmHeight) 
 break; 
}
 for(intj=m_imageCount;j>i;j--) 
{
 memcpy(&images[j],&images[j-1],sizeof(ImageItem)); 
}
 memcpy(&images[i],&item,sizeof(ImageItem)); 
m_imageCount++;
 //设置ID 
 for(i=0;i<m_imageCount;i++) 
{
images[i].id=i+1;
}
}
 BOOLImageList::merge(CStringoutfile) 
{
merge_image_width=GetMaxWidth();
 for(inti=0;i<m_imageCount;i++) 
{
MyBitBlt(i);
}
 unsignedintwidth=merge_image_width; 
 unsignedintheight=merge_image_height; 
 HDCimgDC=CreateCompatibleDC(NULL); 
 VOID*pbits32; 
 HBITMAPholdBmp,hbm32; 
BITMAPFILEHEADERhdr;
BITMAPINFOHEADERbmi;
 unsignedchar*buffer; 
 HANDLEhFile; 
 intLineDataBytes=width*4; 
 intZero=(4-((width*3)%4))%4; 
 intTotalDataBytes=(width*3+Zero)*height; 
 BOOLresult=FALSE; 
 if(width<=0||height<=0) 
 returnFALSE; 
 hdr.bfType=((WORD)('M'<<8)|'B');//"BM" 
hdr.bfReserved1=0;
hdr.bfReserved2=0;
 hdr.bfOffBits=(DWORD)(sizeof(hdr)+sizeof(bmi)); 
hdr.bfSize=(width*3+Zero)*height+hdr.bfOffBits;
 bmi.biSize=sizeof(BITMAPINFOHEADER); 
bmi.biWidth=width;
bmi.biHeight=height;
bmi.biPlanes=1;
bmi.biBitCount=24;
bmi.biCompression=BI_RGB;
bmi.biSizeImage=0;
bmi.biXPelsPerMeter=0;
bmi.biYPelsPerMeter=0;
bmi.biClrUsed=0;
bmi.biClrImportant=0;
hFile=CreateFile(outfile,GENERIC_WRITE,FILE_SHARE_WRITE,NULL,CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL);
 if(INVALID_HANDLE_VALUE!=hFile) 
{
 DWORDbw; 
 WriteFile(hFile,(LPSTR)&hdr,sizeof(hdr),&bw,NULL); 
 WriteFile(hFile,(LPSTR)&bmi,sizeof(bmi),&bw,NULL); 
bmi.biBitCount=32;
 if(hbm32=CreateDIBSection(imgDC,(BITMAPINFO*)&bmi,DIB_RGB_COLORS,&pbits32,NULL,0)) 
{
 BYTE*p32=(BYTE*)pbits32; 
 LONG*p; 
 unsignedinti,j,h=0; 
 buffer=(unsignedchar*)malloc(TotalDataBytes); 
 holdBmp=(HBITMAP)SelectObject(imgDC,hbm32); 
 //TODO:将这些数据都变成局部变量 
 for(i=0;i<m_imageCount;i++) 
{
 HDChdc=CreateCompatibleDC(NULL); 
 HBITMAPhOldBmp=(HBITMAP)SelectObject(hdc,images[i].hbmp); 
BitBlt(imgDC,images[i].x,images[i].y,images[i].bmp.bmWidth,images[i].bmp.bmHeight,hdc,0,0,SRCCOPY);
 //DeleteObject(SelectObject(hdc,hOldBmp)); 
DeleteDC(hdc);
}
 for(i=0;i<height;i++) 
{
 for(j=0;j<width;j++) 
{
 p=(LONG*)p32+j; 
buffer[h]=GetRValue(*p);
buffer[h+1]=GetGValue(*p);
buffer[h+2]=GetBValue(*p);
h+=3;
}
 if(Zero)h+=Zero; 
p32+=LineDataBytes;
}
 WriteFile(hFile,(LPSTR)buffer,TotalDataBytes,&bw,NULL); 
DeleteObject(SelectObject(imgDC,holdBmp));
free(buffer);
result=TRUE;
}
CloseHandle(hFile);
}
DeleteDC(imgDC);
 returnresult; 
}
 voidImageList::clean() 
{
 for(inti=0;i<m_imageCount;i++) 
{
DeleteObject(images[i].hbmp);
images[i].hbmp=NULL;
}
 memset(images,0,sizeof(images)); 
 memset(rects,0,sizeof(rects)); 
m_imageCount=0;
m_rectCount=0;
merge_image_width=0;
merge_image_height=0;
}
 intImageList::GetMaxHeight() 
{
 intheight=0; 
 for(inti=0;i<m_imageCount;i++) 
{
 if(height<images[i].bmp.bmHeight) 
{
height=images[i].bmp.bmHeight;
}
}
 returnheight; 
}
 intImageList::GetMaxWidth() 
{
 intwidth=0; 
 for(inti=0;i<m_imageCount;i++) 
{
 if(width<images[i].bmp.bmWidth) 
{
width=images[i].bmp.bmWidth;
}
}
 returnwidth; 
}
 voidImageList::SaveToIni(CStringstrPath) 
{
 CStringsessionName="Bitmap"; 
 charkey[64]; 
 charvalue[1024]; 
 memset(value,0,sizeof(value)); 
 sprintf(value,"%i",m_imageCount); 
 WritePrivateProfileString(sessionName,"count",value,strPath); 
 for(inti=0;i<m_imageCount;i++) 
{
 memset(key,0,sizeof(key)); 
 sprintf(key,"bmp%d",i); 
 memset(value,0,sizeof(value)); 
WritePrivateProfileString(sessionName,key,images[i].filename,strPath);
}
}
 voidImageList::LoadFromIni(CStringstrPath) 
{
 CStringsessionName="Bitmap"; 
 charkey[64]; 
 charvalue[1024]; 
CStringfilePath[100];
 intfileCount=0; 
 //读取bmp文件的个数 
 memset(value,0,sizeof(value)); 
 GetPrivateProfileString(sessionName,"count","",value,sizeof(value),strPath); 
 sscanf(value,"%i",&fileCount); 
 //将每个路径依次存到数据里 
 for(inti=0;i<fileCount;i++) 
{
 memset(key,0,sizeof(key)); 
 sprintf(key,"bmp%d",i); 
 memset(value,0,sizeof(value)); 
 GetPrivateProfileString(sessionName,key,"",value,sizeof(value),strPath); 
filePath[i].Format(value);
}
 //根据CString数组初始化imagelist 
InitFromStringArray(filePath,fileCount);
}
 voidImageList::InitFromStringArray(CString*pStr,intcount) 
{
clean();
 for(inti=0;i<count;i++,pStr++) 
{
Insert(*pStr);
}
}
 voidImageList::MyBitBlt(intimage_index) 
{
 inti; 
searchproper:
 for(i=0;i<m_rectCount;i++) 
{
 //rect和image一样大小,设置image的坐标,并将删除rects中的一项 
 if(images[image_index].bmp.bmWidth==rects[i].width&& 
images[image_index].bmp.bmHeight==rects[i].height)
{
images[image_index].x=rects[i].x;
images[image_index].y=rects[i].y;
DeleteRectItem(i);
 return; 
}
 //rect和image的宽一样大小,高rect更大 
 if(images[image_index].bmp.bmWidth==rects[i].width&& 
images[image_index].bmp.bmHeight<rects[i].height)
{
images[image_index].x=rects[i].x;
images[image_index].y=rects[i].y;
 //TODO:checkright 
RectItemtemp;
temp.height=rects[i].height-images[image_index].bmp.bmHeight;
temp.width=rects[i].width;
temp.x=rects[i].x;
temp.y=rects[i].y+images[image_index].bmp.bmHeight;
DeleteRectItem(i);
InsertRectItem(&temp);
 return; 
}
 //rect和image的高一样大小,宽rect更大 
 if(images[image_index].bmp.bmWidth<rects[i].width&& 
images[image_index].bmp.bmHeight==rects[i].height)
{
images[image_index].x=rects[i].x;
images[image_index].y=rects[i].y;
RectItemtemp;
temp.height=rects[i].height;
temp.width=rects[i].width-images[image_index].bmp.bmWidth;
temp.x=rects[i].x+images[image_index].bmp.bmWidth;
temp.y=rects[i].y;
DeleteRectItem(i);
InsertRectItem(&temp);
 return; 
}
 //rect比image高和宽都大 
 if(images[image_index].bmp.bmWidth<rects[i].width&& 
images[image_index].bmp.bmHeight<rects[i].height)
{
images[image_index].x=rects[i].x;
images[image_index].y=rects[i].y;
RectItemtemp1;
temp1.height=images[image_index].bmp.bmHeight;
temp1.width=rects[i].width-images[image_index].bmp.bmWidth;
temp1.x=rects[i].x+images[image_index].bmp.bmWidth;
temp1.y=rects[i].y;
RectItemtemp2;
temp2.height=rects[i].height-images[image_index].bmp.bmHeight;
temp2.width=rects[i].width;
temp2.x=rects[i].x;
temp2.y=rects[i].y+images[image_index].bmp.bmHeight;
DeleteRectItem(i);
InsertRectItem(&temp1);
InsertRectItem(&temp2);
 return; 
}
}
 //找不到合适的rect,就新建一项,并将其插入合适的地方 
RectItemnew_item;
new_item.height=images[image_index].bmp.bmHeight;
new_item.width=merge_image_width;
new_item.x=0;
new_item.y=merge_image_height;
merge_image_height+=new_item.height;
InsertRectItem(&new_item);
 gotosearchproper; 
}
 voidImageList::DeleteRectItem(intindex) 
{
 for(inti=index;i<m_rectCount;i++) 
{
 memcpy(&rects[i],&rects[i+1],sizeof(RectItem)); 
}
m_rectCount--;
}
 voidImageList::InsertRectItem(RectItem*item) 
{
 inti,j; 
 //找到该插入的位置,将其存到i 
 for(i=0;i<m_rectCount;i++) 
{
 if(item->width<rects[i].width) 
{
 break; 
}
 if(item->width==rects[i].width&& 
item->height<rects[i].height)
{
 break; 
}
}
 //插入 
 for(j=m_rectCount-1;j>=i;j--) 
{
 memcpy(&rects[j+1],&rects[j],sizeof(RectItem)); 
}
 memcpy(&rects[i],item,sizeof(RectItem)); 
m_rectCount++;
}

测试代码如下:

CFileDialogfileDlg(TRUE,
NULL,
NULL,
OFN_HIDEREADONLY|OFN_OVERWRITEPROMPT|OFN_ALLOWMULTISELECT,
 "bmp文件(*.bmp)|*.bmp||", 
NULL);
 fileDlg.m_ofn.lpstrFile=newTCHAR[MAX_PATH*100];//最多允许100个文件 
fileDlg.m_ofn.nMaxFile=100*MAX_PATH;
 ZeroMemory(fileDlg.m_ofn.lpstrFile,sizeof(TCHAR)*fileDlg.m_ofn.nMaxFile); 
 if(fileDlg.DoModal()!=IDOK)return; 
 //TODO:initbmpinidata 
CStringfilePath[100];
 //获取图片路径 
POSITIONpos=fileDlg.GetStartPosition();
 intfileCount; 
 for(fileCount=0;pos!=0;fileCount++) 
{
CStringfile=fileDlg.GetNextPathName(pos);
 if(file.Find(".bmp")==-1) 
{
 AfxMessageBox("非bmp文件，程序退出。"); 
exit(1);
}
filePath[fileCount]=file;
}
GlobalImageList.InitFromStringArray(filePath,fileCount);
 GlobalImageList.merge("merge.bmp"); 