我有一个MFC应用程序,我需要在圆圈内绘制图像(或将图像裁剪成圆圈)。
我使用FreeImage加载图像,因此使用FreeImage或MFC功能的答案将起作用。
这是我加载图片的方式:
void DrawImage(CDC *pDC, RECT *pRect, const BYTE *pBuffer, int nBufferLength)
{
FIMEMORY *pfmem = FreeImage_OpenMemory((BYTE*)pBuffer, nBufferLength);
FREE_IMAGE_FORMAT fif = FreeImage_GetFileTypeFromMemory(pfmem);
FIBITMAP *pdib = FreeImage_LoadFromMemory(fif, pfmem);
sz.cx = FreeImage_GetWidth(pdib);
sz.cy = FreeImage_GetHeight(pdib);
CRect rc(pRect);
BITMAPINFO *pbmpi = FreeImage_GetInfo(pdib);
BYTE *pDibBits = FreeImage_GetBits(pdib);
::SetDIBitsToDevice(pDC->GetSafeHdc(),
rc.left,
rc.top,
rc.Width(),
rc.Height(),
0,
0,
0,
rc.Height(),
pDibBits,
pbmpi,
DIB_RGB_COLORS);
FreeImage_Unload(pdib);
FreeImage_CloseMemory(pfmem);
}
答案 0 :(得分:1)
发布我的答案以防有人遇到同样的问题,实际上只是做了@Karthik Krish所写的内容很简单:
// Get the rect of a circle in the center o the image.
CRect rectMask(pRect);
int cx = rectMask.Width();
int cy = rectMask.Heigth();
if (cx > cy)
{
rectMask.left += (cx - cy) / 2;
rectMask.right = rectMask.left + cy;
}
else
{
rectMask.top += (cy - cx) / 2;
rectMask.bottom = rectMask.top + cx;
}
HRGN hRegiaoClip = NULL;
// Create a region for the circle
hRegiaoClip = ::CreateEllipticRgnIndirect(&rectMask);
// Select circle in the Device context.
::SelectClipRgn(pDC->GetSafeHdc(), hRegiaoClip);
// Call function to draw the image (the one in the question).
DrawImage(pDC, pRect, pImgBytes, pSerial->GetImageBufferSize(), TRUE);
// Clean up
::SelectClipRgn(pDC->GetSafeHdc(), NULL);
::DeleteObject(hRegiaoClip);