怎么把两个bmp合成一个bmp？
admin 发表于 2010-10-06 | 来源：互联网 | 阅读：
背景bmp是back.bmp，在指定（30，,20）添加高为50宽为40的new.bmp。这个怎么实现？用MFC，而不是GDI
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背景bmp是back.bmp，在指定（30，,20）添加高为50宽为40的new.bmp。这个怎么实现？用MFC，而不是GDI
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MFC是什么?楼主搞搞清楚，框架。如果没有写这种方法，楼主就不能用啊乖乖的用GDI，写2个CDC合成一下把。
怎么用CDC合成呀？我没做过图片处理，麻烦给代码或关键代码
TransparentBlt
要是实在没有代码就给个可行的编辑步骤，最好包括每部的关键函数
创建一个大的bmp先贴一个，在贴另一个
不懂。我的代码如下：C/C++ code
// 导入背景图片
FILE *fp=fopen("back.bmp", "rb");
if(fp == 0)
return 1;
fseek(fp, sizeof(BITMAPFILEHEADER), 0);
BITMAPINFOHEADER head;
fread(&head, sizeof(BITMAPINFOHEADER), 1, fp);
int bmpHeight = head.biHeight;
int bmpWidth = head.biWidth;
int biBitCount = head.biBitCount;
int lineByte = (bmpWidth*biBitCount/8+3)/4*4;
RGBQUAD *pColorTable;
if(biBitCount ==
{
pColorTable = new RGBQUAD[256];
fread(pColorTable, sizeof(RGBQUAD), 256, fp);
}
unsigned char *pBmpBuf = new unsigned char[lineByte*bmpHeight];
fread(pBmpBuf, 1, lineByte*bmpHeight, fp);
CDC *m_pMemDC;
m_pMemDC = new CDC();
CDC *pDC;
pDC = new CDC();
pDC->Attach(GetDC(0));
m_pMemDC->CreateCompatibleDC(pDC);
CBitmap *m_pOldBmp = NULL;
CBitmap *m_pMemBmp = new CBitmap(); //根据图片的大小创建一个兼容位图
m_pMemBmp->CreateCompatibleBitmap(pDC, bmpWidth, bmpHeight);
m_pOldBmp = m_pMemDC->SelectObject(m_pMemBmp);
// 把图像的数据绘制到兼容位图上
SetDIBits(m_pMemDC->GetSafeHdc(), (HBITMAP)m_pMemBmp->m_hObject,
0, bmpHeight, (LPVOID)pBmpBuf, (BITMAPINFO*)&head, DIB_RGB_COLORS);
// 导入新图片
FILE *lfp=fopen("new.bmp", "rb");
if(lfp == 0)
return 1;
fseek(lfp, sizeof(BITMAPFILEHEADER), 0);
BITMAPINFOHEADER lhead;
fread(&lhead, sizeof(BITMAPINFOHEADER), 1, lfp);
bmpHeight = lhead.biHeight;
bmpWidth = lhead.biWidth;
biBitCount = lhead.biBitCount;
lineByte = (bmpWidth*biBitCount/8+3)/4*4;
RGBQUAD *ColorTable;
if(biBitCount ==
{
ColorTable = new RGBQUAD[256];
fread(ColorTable, sizeof(RGBQUAD), 256, lfp);
}
unsigned char *BmpBuf = new unsigned char[lineByte*bmpHeight];
fread(BmpBuf, 1, lineByte*bmpHeight, lfp);
CDC *pMemDC;
pMemDC = new CDC();
CDC *DC;
DC = new CDC();
DC->Attach(GetDC(0));
pMemDC->CreateCompatibleDC(DC);
CBitmap *m_MemBmp = new CBitmap(); //根据图片的大小创建一个兼容位图
m_MemBmp->CreateCompatibleBitmap(DC, bmpWidth, bmpHeight);
SetDIBits(pMemDC->GetSafeHdc(), (HBITMAP)m_MemBmp->m_hObject,
0, bmpHeight, (LPVOID)BmpBuf, (BITMAPINFO*)&lhead, DIB_RGB_COLORS);
// 将新图片添加到背景图片？？？？？？？？？？
pMemDC->BitBlt(0, 0, bmpWidth, bmpHeight, m_pMemDC, 0, 0, SRCCOPY);
知道怎么读写BMP文件吗（我说的是根据BMP格式，来解释文件的数据）？如果知道的话很容易做呀。C/C++ code
#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <time.h>
BYTE *Read8BitBmpFile2Img(const char * filename,int *width,int *height)
{
FILE *BinFile;
BITMAPFILEHEADER FileHeader;
BITMAPINFOHEADER BmpHeader;
BYTE *pImg;
unsigned int size;
int Suc=1,w,h;
// Open File
*width=*height=0;
if((BinFile=fopen(filename,"rb"))==NULL) return NULL;
// Read Struct Info
if (fread((void *)&FileHeader,1,sizeof(FileHeader),BinFile)!=sizeof(FileHeader)) Suc=-1;
if (fread((void *)&BmpHeader,1,sizeof(BmpHeader),BinFile)!=sizeof(BmpHeader)) Suc=-1;
if ( (Suc==-1) ||
(FileHeader.bfOffBits<sizeof(FileHeader)+sizeof(BmpHeader) )
)
{
fclose(BinFile);
return NULL;
}
// Read Image Data
*width=w=BmpHeader.biWidth;
*height=h=BmpHeader.biHeight;
size=w*h;
fseek(BinFile,FileHeader.bfOffBits,SEEK_SET);
if ( (pImg=new BYTE[size])!=NULL)
{
for(int i=0;i<h;i++)
{
if (fread(pImg+(h-1-i)*w,sizeof(BYTE),w,BinFile)!=w)
{
fclose(BinFile);
delete pImg;
pImg=NULL;
return NULL;
}
fseek(BinFile,(w+3)/4*4-w,SEEK_CUR);
}
}
fclose(BinFile);
return pImg;
}
bool Write8BitImg2BmpFile(BYTE *pImg,int width,int height,const char * filename)
// 当宽度不是4的倍数时自动添加成4的倍数
{ FILE * BinFile;
BITMAPFILEHEADER FileHeader;
BITMAPINFOHEADER BmpHeader;
int i,extend;
bool Suc=true;
BYTE p[4],*pCur;
// Open File
| ‘B’);
if((BinFile=fopen(filename,"w+b"))==NULL) { return false; }
// Fill the FileHeader
FileHeader.bfType= ((WORD) (‘M’ <<
FileHeader.bfOffBits=sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+256*4L;
FileHeader.bfSize=FileHeader.bfOffBits+width*height ;
FileHeader.bfReserved1=0;
FileHeader.bfReserved2=0;
if (fwrite((void *)&FileHeader,1,sizeof(FileHeader),BinFile)!=sizeof(FileHeader)) Suc=false;
// Fill the ImgHeader
BmpHeader.biSize = 40;
BmpHeader.biWidth = width;
BmpHeader.biHeight = height;
BmpHeader.biPlanes = 1 ;
BmpHeader.biBitCount = 8 ;
BmpHeader.biCompression = 0 ;
BmpHeader.biSizeImage = 0 ;
BmpHeader.biXPelsPerMeter = 0;
BmpHeader.biYPelsPerMeter = 0;
BmpHeader.biClrUsed = 0;
BmpHeader.biClrImportant = 0;
if (fwrite((void *)&BmpHeader,1,sizeof(BmpHeader),BinFile)!=sizeof(BmpHeader)) Suc=false;
// write Pallete
for (i=0,p[3]=0;i<256;i++)
{
p[3]=0;
p[0]=p[1]=p[2]=i; // blue,green,red;
if (fwrite((void *)p,1,4,BinFile)!=4) { Suc=false; break; }
}
// write image data
extend=(width+3)/4*4-width;
if (extend==0)
{
for(pCur=pImg+(height-1)*width;pCur>=pImg;pCur-=width)
{
if (fwrite((void *)pCur,1,width,BinFile)!=(unsigned int)width) Suc=false; // 真实的数据
}
}
else
{
for(pCur=pImg+(height-1)*width;pCur>=pImg;pCur-=width)
{
if (fwrite((void *)pCur,1,width,BinFile)!=(unsigned int)width) Suc=false; // 真实的数据
for(i=0;i<extend;i++) // 扩充的数据
if (fwrite((void *)(pCur+width-1),1,1,BinFile)!=1) Suc=false;
}
}
// return;
fclose(BinFile);
return Suc;
}
BYTE *Read24BitBmpFile2Img(const char * filename,int *width,int *height)
{ FILE * BinFile;
BITMAPFILEHEADER FileHeader;
BITMAPINFOHEADER BmpHeader;
BYTE *img;
unsigned int size;
int Suc=1,w,h;
// Open File
*width=*height=0;
if((BinFile=fopen(filename,"rb"))==NULL) return NULL;
// Read Struct Info
if (fread((void *)&FileHeader,1,sizeof(FileHeader),BinFile)!=sizeof(FileHeader)) Suc=-1;
if (fread((void *)&BmpHeader,1,sizeof(BmpHeader),BinFile)!=sizeof(BmpHeader)) Suc=-1;
if ( (Suc==-1) ||
(FileHeader.bfOffBits<sizeof(FileHeader)+sizeof(BmpHeader) )
)
{
fclose(BinFile);
return NULL;
}
// Read Image Data
*width=w=BmpHeader.biWidth;
*height=h=BmpHeader.biHeight;
size=(*width)*(*height)*3;
fseek(BinFile,FileHeader.bfOffBits,SEEK_SET);
if ( (img=new BYTE[size])!=NULL)
{
for(int i=0;i<h;i++)
{
if(fread(img+(h-1-i)*w*3,sizeof(BYTE),w*3,BinFile)!=w*3)
{
fclose(BinFile);
delete img;
img=NULL;
return NULL;
}
fseek(BinFile,(3*w+3)/4*4-3*w,SEEK_CUR);
}
}
fclose(BinFile);
return img;
}
bool Write24BitImg2BmpFile(BYTE *pImg,int width,int height,const char * filename)
// 当宽度不是4的倍数时自动添加成4的倍数
{ FILE *BinFile;
BITMAPFILEHEADER FileHeader;
BITMAPINFOHEADER BmpHeader;
bool Suc=true;
int i,extend;
BYTE *pCur;
// Open File
| ‘B’);
if((BinFile=fopen(filename,"w+b"))==NULL) { return false; }
// Fill the FileHeader
FileHeader.bfType= ((WORD) (‘M’ <<
FileHeader.bfOffBits=sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER);
FileHeader.bfSize=FileHeader.bfOffBits+width*height*3L ;
FileHeader.bfReserved1=0;
FileHeader.bfReserved2=0;
if (fwrite((void *)&FileHeader,1,sizeof(BITMAPFILEHEADER),BinFile)!=sizeof(BITMAPFILEHEADER)) Suc=false;
// Fill the ImgHeader
BmpHeader.biSize = 40;
BmpHeader.biWidth = width;
BmpHeader.biHeight = height;
BmpHeader.biPlanes = 1 ;
BmpHeader.biBitCount = 24 ;
BmpHeader.biCompression = 0 ;
BmpHeader.biSizeImage = 0 ;
BmpHeader.biXPelsPerMeter = 0;
BmpHeader.biYPelsPerMeter = 0;
BmpHeader.biClrUsed = 0;
BmpHeader.biClrImportant = 0;
if (fwrite((void *)&BmpHeader,1,sizeof(BITMAPINFOHEADER),BinFile)!=sizeof(BITMAPINFOHEADER)) Suc=false;
// write image data
extend=(3*width+3)/4*4-3*width;
if (extend==0)
{
for(pCur=pImg+(height-1)*3*width;pCur>=pImg;pCur-=3*width)
{
if (fwrite((void *)pCur,1,width*3,BinFile)!=(unsigned int)(3*width)) Suc=false; // 真实的数据
}
}
else
{
for(pCur=pImg+(height-1)*3*width;pCur>=pImg;pCur-=3*width)
{
if (fwrite((void *)pCur,1,width*3,BinFile)!=(unsigned int)(3*width)) Suc=false; // 真实的数据
if (fwrite((void *)(pCur+3*(width-1)+0),1,extend,BinFile)!=1) Suc=false;// 扩充的数据
}
}
// return;
fclose(BinFile);
return Suc;
}
上面几个函数修改一下，调用一下就可以了。
还是使用GDI+ 吧，很简单的 Graphics g(hdc);Image *pFile= Image::FromFile(L"test1.bmp");g.DrawImage(pFile,0,0);delete pFile;Image *pImage2= Image::FromFile(L"test2.bmp");g.DrawImage(pImage2,0,0);delete pImage2;