C# 如何将遮罩应用于CompositionBrush
您可以使用以下解决方案,即使用两次相同的图像。 我使用一个用于模糊背景,一个用于剪裁前景 其思想是使用前景视觉的属性绘制全尺寸模糊背景,并在其上仅绘制所需的剪裁区域 页面/控件的XAML:C# 如何将遮罩应用于CompositionBrush,c#,uwp,win2d,xaml-composition,C#,Uwp,Win2d,Xaml Composition,您可以使用以下解决方案,即使用两次相同的图像。 我使用一个用于模糊背景,一个用于剪裁前景 其思想是使用前景视觉的属性绘制全尺寸模糊背景,并在其上仅绘制所需的剪裁区域 页面/控件的XAML: var graphicsEffect = new BlendEffect { Mode = BlendEffectMode.Multiply, Background = new ColorSourceEffect { Name = "Tint",
var graphicsEffect = new BlendEffect
{
Mode = BlendEffectMode.Multiply,
Background = new ColorSourceEffect
{
Name = "Tint",
Color = Windows.UI.Color.FromArgb(50,0,255,0),
},
Foreground = new GaussianBlurEffect()
{
Name = "Blur",
Source = new CompositionEffectSourceParameter("Backdrop"),
BlurAmount = (float)20,
BorderMode = EffectBorderMode.Hard,
}
};
var blurEffectFactory = _compositor.CreateEffectFactory(graphicsEffect,
new[] { "Blur.BlurAmount", "Tint.Color" });
var _brush = blurEffectFactory.CreateBrush();
_brush.SetSourceParameter("Backdrop", _compositor.CreateBackdropBrush());
var blurSprite = _compositor.CreateSpriteVisual();
blurSprite.Size = new Vector2((float)BackgroundImage.ActualWidth, (float)BackgroundImage.ActualHeight);
blurSprite.Brush = _brush;
ElementCompositionPreview.SetElementChildVisual(BackgroundImage, blurSprite);
在Creators update中,我可以创建从
XamlCompositionBrushBase
派生的类,并将其应用于xaml元素,因此它会进行模糊处理:
protected override void OnNavigatedTo(NavigationEventArgs e)
{
_compositor = ElementCompositionPreview.GetElementVisual(this).Compositor;
_backgroundImageVisual = ElementCompositionPreview.GetElementVisual(BackgroundImage);
var graphicEffect = new BlendEffect
{
Mode = BlendEffectMode.Multiply,
Background = new ColorSourceEffect
{
Color= Color.FromArgb(50, 0, 255, 0)
},
Foreground = new GaussianBlurEffect
{
Source = new CompositionEffectSourceParameter("Backdrop"),
BlurAmount = 20.0f,
BorderMode = EffectBorderMode.Hard
}
};
var backdropBrush = _compositor.CreateBackdropBrush();
var blurEffectFactory = _compositor.CreateEffectFactory(graphicEffect);
_brush = blurEffectFactory.CreateBrush();
_brush.SetSourceParameter("Backdrop", backdropBrush);
_blurSprite = _compositor.CreateSpriteVisual();
_blurSprite.Brush = _brush;
ElementCompositionPreview.SetElementChildVisual(BackgroundImage, _blurSprite);
_foregroundImageVisual = ElementCompositionPreview.GetElementVisual(ClippedImage);
_foregroundImageVisual.Clip = _compositor.CreateInsetClip(100, 100, 100, 100);
SizeChanged += MainPage_SizeChanged;
MainPage_SizeChanged(this, null);
}
private void MainPage_SizeChanged(object sender, SizeChangedEventArgs e)
{
_blurSprite.Size = new Vector2((float) BackgroundImage.ActualWidth, (float) BackgroundImage.ActualHeight);
// change the clip values here to change the non-blurred region
_foregroundImageVisual.Clip = _compositor.CreateInsetClip(100, 100, 100, 100);
}
你能提供预期结果的屏幕截图吗?除非有比我更了解WPF的人提出解决方案,你能让整个背景模糊,然后在上面叠加一段没有模糊的图像吗?做我吧-我需要GDI+工具和当前的位图修改pixels@Tatranskymedved:首先,GDI+不是UWP中的一种方式。其次,我知道使用CompositionAPI是可能的,我只是没有能够在适当的时间内让它工作,因为我是api新手。我可能会回去再试一次。@Liero:对不起,我还没有意识到这是UWP&老实说,我不知道GDI+不值得在那里使用。我们将从中吸取教训。谢谢=)
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<Image x:Name="BackgroundImage" Source="/Assets/Purple Tentacle.png" />
<Image x:Name="ClippedImage" Source="/Assets/Purple Tentacle.png" />
</Grid>
protected override void OnNavigatedTo(NavigationEventArgs e)
{
_compositor = ElementCompositionPreview.GetElementVisual(this).Compositor;
_backgroundImageVisual = ElementCompositionPreview.GetElementVisual(BackgroundImage);
var graphicEffect = new BlendEffect
{
Mode = BlendEffectMode.Multiply,
Background = new ColorSourceEffect
{
Color= Color.FromArgb(50, 0, 255, 0)
},
Foreground = new GaussianBlurEffect
{
Source = new CompositionEffectSourceParameter("Backdrop"),
BlurAmount = 20.0f,
BorderMode = EffectBorderMode.Hard
}
};
var backdropBrush = _compositor.CreateBackdropBrush();
var blurEffectFactory = _compositor.CreateEffectFactory(graphicEffect);
_brush = blurEffectFactory.CreateBrush();
_brush.SetSourceParameter("Backdrop", backdropBrush);
_blurSprite = _compositor.CreateSpriteVisual();
_blurSprite.Brush = _brush;
ElementCompositionPreview.SetElementChildVisual(BackgroundImage, _blurSprite);
_foregroundImageVisual = ElementCompositionPreview.GetElementVisual(ClippedImage);
_foregroundImageVisual.Clip = _compositor.CreateInsetClip(100, 100, 100, 100);
SizeChanged += MainPage_SizeChanged;
MainPage_SizeChanged(this, null);
}
private void MainPage_SizeChanged(object sender, SizeChangedEventArgs e)
{
_blurSprite.Size = new Vector2((float) BackgroundImage.ActualWidth, (float) BackgroundImage.ActualHeight);
// change the clip values here to change the non-blurred region
_foregroundImageVisual.Clip = _compositor.CreateInsetClip(100, 100, 100, 100);
}
<Grid>
<Image x:Name="BackgroundImage" Source="/Assets/background.png" />
<Path>
<Path.Fill>
<local:BlurTintBrush BlurRadius="5" TintColor="Black" TintOpacity="0.7" />
</Path.Fill>
<Path.Data>
<GeometryGroup>
<RectangleGeometry x:Name="ImageGeometry" Rect="0,0,1027,768" /
<RectangleGeometry x:Name="CropGeometry" Rect="50,50,25,25" />
</GeometryGroup>
</Path.Data>
</Path>
</Grid>