9，图像转置

即宽高的大小互换，像素的x坐标和y坐标也互换

void CDib::transpose()
{
//指向原图像指针
LPBYTE p_data = GetData();
//图像的宽和高
LONG width = GetWidth();
LONG height = GetHeight();
//图像每行字节数
LONG iLineBytes = (width * 8 + 31) / 32 * 4;
//新图像每行字节数
LONG lNewLineBytes = (height * 8 + 31) / 32 * 4;
//指向原像素的指针
LPBYTE lpSrc;
//指向转置图像对应像素的指针
LPBYTE lpDst;
//分配内存
LPBYTE temp = new BYTE[width * lNewLineBytes];
//针对图像每行进行操作
for (int j = 0; j < height; j++)
{
//针对图像该行的每列进行操作
for (int i = 0; i < width; i++)
{
//指向原DIB第j行i列的像素的指针
lpSrc = (LPBYTE)p_data + iLineBytes * j + i;
//指向转置DIB第i行j列像素的指针
lpDst = (LPBYTE)temp + lNewLineBytes * i + j;
//复制像素
*lpDst = *lpSrc;
}
}
m_pBitmapInfoHeader->biWidth = height;
m_pBitmapInfoHeader->biHeight = width;
//复制图像
memcpy(p_data, temp, width * height);
}
加载文件后调用

CMy1_showbitmapView::CMy1_showbitmapView()
{
_cdib.LoadFile (“D:/Test/DataProcess/result.bmp”);
_cdib.transpose();
}