UWP Composition Api是否支持颜色替换? [英] Does UWP Composition Api support color replacement?
问题描述
我一直在寻找与颜色替换有关的示例,这是一个使用Photoshop的示例,该示例可以采用例如蓝色阴影并将其替换为红色阴影:
I've been trying to look for an examples which related to Color Replacement, here's an example using the Photoshop which can take, for example, a Blue shade and replace it with a Red shade:
之前:
之后:
使用最新版本的Composition Api中的Composition Effects是否可能?
Is this possible using the Composition Effects in the latest version of Composition Api?
我看过与色相旋转,温度和色调有关的示例:
I've seen examples related to Hue Rotations and Temperature and Tint:
https://xamlbrewer.wordpress.com/2016/04/08/uwp-composition-effects-hue-rotation/
https://xamlbrewer.wordpress .com/2016/04/19/uwp-composition-effects-temperature-and-tint/
但是我想知道api是否能够使用效果来切换图像的颜色范围?
But I'm wondering if the api is capable of using Effects to switch a color range in an image ??
推荐答案
我有一个您可能喜欢的解决方案.该示例如下所示:
I have a solution you may like. The sample looks like this:
为此,我在链中使用了3种效果:来自 Win2d API的PixelShaderEffect
,GaussianBlurEffect
和BlendEffect
.
To achieve this I used 3 effects in a chain: PixelShaderEffect
, GaussianBlurEffect
and BlendEffect
from Win2d API.
XAML具有CanvasAnimatedControl
来绘制结果以及一些辅助工具(例如源(我们要替换的颜色)),并替换颜色选择器和阈值滑块.
XAML has CanvasAnimatedControl
to draw the result plus some helpers like source (the color we want to replace) and replace color pickers and threshold slider.
<Grid>
<xaml:CanvasAnimatedControl x:Name="AnimatedControl"
CreateResources="AnimatedControl_OnCreateResources"
Draw="AnimatedControl_OnDraw"/>
<StackPanel HorizontalAlignment="Left" VerticalAlignment="Bottom">
<TextBlock Text="Source Color" FontSize="32" Foreground="White" TextAlignment="Center"/>
<ColorSpectrum Width="256" Height="256" ColorChanged="ColorSpectrum_OnColorChanged"/>
</StackPanel>
<StackPanel HorizontalAlignment="Right" VerticalAlignment="Bottom">
<TextBlock Text="Replace Color" FontSize="32" Foreground="White" TextAlignment="Center"/>
<ColorSpectrum Width="256" Height="256" ColorChanged="ColorSpectrum_OnColorChanged1"/>
</StackPanel>
<Slider Width="512" ValueChanged="RangeBase_OnValueChanged" VerticalAlignment="Center"/>
</Grid>
后面的代码:
private PixelShaderEffect _textureShader;
private GaussianBlurEffect _blur;
private BlendEffect _blend;
private void AnimatedControl_OnCreateResources(CanvasAnimatedControl sender, CanvasCreateResourcesEventArgs args)
{
args.TrackAsyncAction(CreateResourcesAsync(sender).AsAsyncAction());
}
private async Task CreateResourcesAsync(CanvasAnimatedControl sender)
{
var file = await StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///Assets/Shaders/TextureTest.bin"));
var buffer = await FileIO.ReadBufferAsync(file);
var sourceImage = await CanvasBitmap.LoadAsync(sender, new Uri("ms-appx:///Assets/image.jpg"));
_textureShader = new PixelShaderEffect(buffer.ToArray())
{
Source1 = sourceImage
};
_blur = new GaussianBlurEffect
{
BlurAmount = 4,
Source = _textureShader
};
_blend = new BlendEffect
{
Foreground = _blur,
Background = sourceImage,
Mode = BlendEffectMode.Color
};
}
private void AnimatedControl_OnDraw(ICanvasAnimatedControl sender, CanvasAnimatedDrawEventArgs args)
{
args.DrawingSession.DrawImage(_blend);
}
private void RangeBase_OnValueChanged(object sender, RangeBaseValueChangedEventArgs e)
{
_textureShader.Properties["threshold"] = (float)e.NewValue / 100;
}
private void ColorSpectrum_OnColorChanged(ColorSpectrum sender, ColorChangedEventArgs args)
{
_textureShader.Properties["sourceColor"] = new Vector3((float)args.NewColor.R / 255, (float)args.NewColor.G / 255, (float)args.NewColor.B / 255);
}
private void ColorSpectrum_OnColorChanged1(ColorSpectrum sender, ColorChangedEventArgs args)
{
_textureShader.Properties["replaceColor"] = new Vector3((float)args.NewColor.R / 255, (float)args.NewColor.G / 255, (float)args.NewColor.B / 255);
}
最令人兴奋的是像素着色器:
And the most exciting thing is a pixel shader:
#define D2D_INPUT_COUNT 1
#define D2D_INPUT0_SIMPLE
#include "d2d1effecthelpers.hlsli"
float3 sourceColor;
float3 replaceColor;
float threshold;
D2D_PS_ENTRY(main)
{
float3 color = D2DGetInput(0).rgb;
if (abs(color.r - sourceColor.r) < threshold && abs(color.g - sourceColor.g) < threshold && abs(color.b - sourceColor.b) < threshold)
{
float3 newColor = color - sourceColor + replaceColor;
return float4(newColor.r, newColor.g, newColor.b, 1);
}
else
{
return float4(0, 0, 0, 0);
}
}
要编译它,您应该在这里浏览: https ://github.com/Microsoft/Win2D-Samples/tree/master/ExampleGallery/Shared/Shaders
To compile it you should take a tour here: https://github.com/Microsoft/Win2D-Samples/tree/master/ExampleGallery/Shared/Shaders
有一个cmd文件可以编译您的hlsl着色器.如果您需要帮助-对其进行评论.玩得开心!
There's cmd file that compiles your hlsl shaders. If you need some help - comment it. Have fun!
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