在没有GDI +的情况下，如何在WPF下将大图像更改/调整为小图像? [英] How to change/resizing a large image to small image under WPF without GDI+?

问题描述

大家好，

图像很大并在运行时加载，实际上我想在没有GDI +的WPF设施下将相同大小的图像调整为小图像.
换句话说，我有一个ImageBrush并在运行时在其ImageSource中将图像设置为大，因此我想将其大小调整为小.

任何帮助请...

在此先谢谢您.

Hi everybody,

The image is large and loaded it in run-time, actually I want resize selfsame to a small image under WPF facilities without GDI+.
In other words, I have an ImageBrush and set an image large in its ImageSource in run-time, so I want resizing it to small.

Any help pls...

Thanks in advance.

推荐答案

图像仍然是图像-所以像
构建ASP. NET缩略图图像生成器 [ WPF内存图像显示 [ RenderTargetBitmap [

An image is still an image - so things like
Build an ASP.NET Thumbnail Image Generator[^] provides the code required to create the thumbnail.

And then do something like WPF In-Memory Image Display[^]

You can also use RenderTargetBitmap[^]

public static BitmapSource CreateBitmapSourceFromVisual(double width, double height, Visual visual)
{
    if (visual == null)
    {
        return null;
    }
    RenderTargetBitmap bmp = new RenderTargetBitmap((Int32)Math.Ceiling(width),(Int32)Math.Ceiling(height),300,300,PixelFormats.Pbgra32);
 
    bmp.Render(visual);
    return bmp;
}

最好的问候
Espen Harlinn

Best regards
Espen Harlinn

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