我如何在代码中知道RadialGradientBrush是否未正确显示? [英] How do I know, in code, if RadialGradientBrush is not being shown correctly?

问题描述

我将RadialGradientBrush用作Button的背景. 在一台计算机上，它运行良好. 另一方面，背景是透明的.

I'm using RadialGradientBrush as background for a Button. On one computer, it works well. On the other, the background is transparent.

NewComputer:Intel i7-8700、16Gb ram，64位操作系统，图形-Nvidia GeForce GTx1050Ti

NewComputer: Intel i7-8700, 16Gb ram, 64-bit OS, graphics - Nvidia GeForce GTx1050Ti

OldComputer:Intel 6300、2Gb ram，32位操作系统，图形-Intel G965 Express芯片组家族

OldComputer: Intel 6300, 2Gb ram, 32-bit OS, graphics - Intel G965 Express Chipset Family

两台计算机都运行Windows 10 Home，1809(17763.503)，1920x1080显示器.

Both computers are running Windows 10 Home, 1809 (17763.503), 1920x1080 monitor.

在每台计算机上运行相同的程序(如下所示)，我没有让RadialGradientBrush显示在OldComputer上. RadialGradientBrush处于活动状态-我可以从GradientStop 1 中获取颜色，并将其用作用于背景的SolidColorBrush.

Running the same program on each computer (shown below), I do not get the RadialGradientBrush to show up on the OldComputer. The RadialGradientBrush is active - I can get the color from GradientStop1, and use that as a SolidColorBrush for the background.

LinearGradientBrush将正确显示在OldComputer上.

A LinearGradientBrush will show up correctly on the OldComputer.

G965的驱动程序从2012年开始，是最新的驱动程序.我猜是问题出在旧的G965图形上，尽管我对此并不满意.

The driver for the G965 is from 2012, which is as up-to-date as is available. I am guessing that the problem is this old G965 graphics, though I am not positive of this.

这是程序中唯一的代码.除了默认的代码外，没有其他任何代码.

This is the only code in the program. There is no additional code behind, other than that which comes as default.

<Page
    x:Class="RadialGradientBrush_Test.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:RadialGradientBrush_Test"
    xmlns:media="using:Microsoft.Toolkit.Uwp.UI.Media"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">

    <Page.Resources>
        <!-- Radial Brush -->
        <media:RadialGradientBrush x:Key="MyRadialBrush"
            GradientOrigin="0.5,0.5" Center="0.5,0.5"
            RadiusX="0.5" RadiusY="0.5" FallbackColor="Red">
            <GradientStop Color="#FFF0F8FF" Offset="0" />
            <GradientStop Color="#FF1E90FF" Offset="1" />
        </media:RadialGradientBrush>

    </Page.Resources>

    <Grid>
        <Button Content="Test" Background="{StaticResource MyRadialBrush}"
            HorizontalAlignment="Center" BorderBrush="Black"
            BorderThickness="1"/>
    </Grid>
</Page>

NewComputer:

NewComputer:

OldComputer:

OldComputer:

我有一种解决方法，该方法是在按钮后面放置一个边框，该边框与按钮的形状相同，并用后备纯色填充.

I have a workaround, which is putting a border behind the button, with the same shape as the button, filled with the fallback solid color.

我宁愿在代码中找到一种方法来知道是否要显示RadialGradientBrush，然后将按钮背景更改为SolidColorBrush，也许是看图形系统的功能?
从概念上讲，类似于Graphics.Capabilities.RadialGradientBrush.
有什么想法要怎么做?

I would rather find a way in code to know if the RadialGradientBrush is going to be shown, and then change the button background to a SolidColorBrush, maybe looking at the capabilities of the graphics system?
Conceptually, something like Graphics.Capabilities.RadialGradientBrush.
Any ideas how to do this?

在OldComputer中使用图形卡-现在可以显示RadialGradientBrush.似乎是G965图形. 我使用WindowsCommunityToolkit在此问题上提出了问题.

Edit 1: Using a graphics card in the OldComputer - can now display RadialGradientBrush. Appears to be the G965 graphics. I opened an issue on this with WindowsCommunityToolkit.

推荐答案

我宁愿在代码中找到一种方法来知道是否要显示RadialGradientBrush，然后将按钮背景更改为SolidColorBrush，也许是看图形系统的功能?

I would rather find a way in code to know if the RadialGradientBrush is going to be shown, and then change the button background to a SolidColorBrush, maybe looking at the capabilities of the graphics system?

RadialGradientBrush 类具有属性.在无法渲染CompositionBrush时用于渲染的颜色.符合您的要求.

The RadialGradientBrush class has a FallbackColor property. The color to use for rendering in case the CompositionBrush can't be rendered. It meets your requirement.

<media:RadialGradientBrush x:Key="MyRadialBrush"
        GradientOrigin="0.5,0.5" Center="0.5,0.5"
        RadiusX="0.5" RadiusY="0.5" FallbackColor="White">
        <GradientStop Color="#FFF0F8FF" Offset="0" />
        <GradientStop Color="#FF1E90FF" Offset="1" />
</media:RadialGradientBrush>

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