CImage缩放图片、截图图片

最新推荐文章于 2025-05-29 15:47:03 发布

原创最新推荐文章于 2025-05-29 15:47:03 发布 · 638 阅读

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#c++

文章介绍了如何使用CImage类进行图片的加载、按比例缩放、裁剪以及透明度调整的操作，展示了在C++编程中处理图像的基本步骤。

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CImage oldimg;
//加载图片
oldimg.Load(GetExePath() + "img\\" + "test.bmp");
if (oldimg.IsNull())
{
	continue;
}

int oldWidth = oldimg.GetWidth();
int oldHeight = oldimg.GetHeight();

int newWidth = oldWidth+10;
int newHeight = oldHeight+10;
CImage newimg;
if (!newimg.CreateEx(newWidth, newHeight, 24, BI_RGB))
{
	oldimg.Destroy();
	continue;
}

//按比例放大或缩小图片
int nPreMode = ::SetStretchBltMode(newimg.GetDC(), HALFTONE);
newimg.ReleaseDC();
oldimg.Draw(newimg.GetDC(), 0, 0, newWidth, newHeight, 0, 0, oldWidth, oldHeight);
newimg.ReleaseDC();

::SetBrushOrgEx(newimg.GetDC(), 0, 0, NULL);
newimg.ReleaseDC();
::SetStretchBltMode(newimg.GetDC(), nPreMode);
newimg.ReleaseDC();


//裁剪图片
int cutWidth = oldWidth/2;
int cutHeight = oldHeight/2;
CImage  timg;
timg.Create(cutWidth, cutHeight, oldimg.GetBPP());
oldimg.BitBlt(timg.GetDC(), 0, 0, cutWidth, cutHeight, 0, 0, SRCCOPY);
timg.TransparentBlt(pDC->GetSafeHdc(), 0, 0, cutWidth, cutHeight, RGB(255, 255, 255));
timg.ReleaseDC();
timg.Destroy();

newimg.Destroy();
oldimg.Destroy();