航空：如何在玻璃上绘制纯色（不透明）？ [英] Aero: How to draw solid (opaque) colors on glass?

问题描述

使用GDI +绘制各种颜色：

  brush = new SolidBrush（color）; 
 graphics.FillRectangle（brush，x，y，width，height）; 
  

您会注意到玻璃上没有正确显示不透明的颜色：

我如何在玻璃上绘制纯色？

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您还会注意到，完全不透明的颜色根据其颜色的不同而有所不同：

• 不透明黑色：完全透明


• 不透明颜色：部分透明


• 不透明白色：完全不透明

有人可以指出我在桌面合成器上的文档，该文档解释了如何处理不同的颜色吗？

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更新3

您还会注意到 FillRectangle 的行为不同于 FillEllipse ：

• FillEllipse 绘制不透明颜色


• FillRectangle 具有不透明的颜色部分（或完全）绘制透明

对非理性行为的解释

更新4

Windows Aero：要绘画什么颜色使玻璃出现？

Vista / 7：如何获得玻璃色？

解决方案

再过一天

• 将要显示在玻璃上的所有内容绘制到位图中。


• 然后，用黑色清除表单背景。


• 此后，立即在表单上绘制位图。

$ b但是，$ b

（与其他任何不使用DrawThemeTextEx的解决方案一样）：
文本渲染将无法正常工作，因为它始终将表单的底色用作抗锯齿/清除类型提示。请改用DrawThemeTextEx，它还支持后面带有发光效果的文本。

Using GDI+ to draw various colors:

brush = new SolidBrush(color);
graphics.FillRectangle(brush, x, y, width, height);

You'll notice that no opaque color shows properly on glass:

How do i draw solid colors on glass?

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You'll also notice that a fully opaque color is handled differently depending on what color it is:

• opaque black: fully transparent
• opaque color: partially transparent
• opaque white: fully opaque

Can anyone point me to the documentation on the desktop compositor that explains how different colors are handled?

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Update 3

You'll also notice that FillRectangle behaves differently than FillEllipse:

• FillEllipse with an opaque color draws an opaque color
• FillRectangle with an opaque color draws partially (or fully) transparent

Explanation for non-sensical behavior please.

Update 4

Alwayslearning suggested i change the compositing mode. From MSDN:

CompositingMode Enumeration

The CompositingMode enumeration specifies how rendered colors are combined with background colors. This enumeration is used by the Graphics::GetCompositingMode and 'Graphics::SetCompositingMode' methods of the Graphics class.

CompositingModeSourceOver

Specifies that when a color is rendered, it is blended with the background color. The blend is determined by the alpha component of the color being rendered.

CompositingModeSourceCopy

Specifies that when a color is rendered, it overwrites the background color. This mode cannot be used along with TextRenderingHintClearTypeGridFit.

From the description of CompositingModeSourceCopy, it sounds like it's not the option i want. From the limitations it imposes, it sounds like the option i want. And with composition, or transparency disabled it isn't the option i want, since it performs a SourceCopy, rather than SourceBlend:

Fortunately it's not an evil i have to contemplate because it doesn't solve my actual issue. After constructing my graphics object, i tried changed the compositing mode:

graphics = new Graphics(hDC);
graphics.SetCompositingMode(CompositingModeSourceCopy); //CompositingModeSourceCopy = 1

The result has no effect on the output:

Notes

• Win32 native
• not .NET (i.e. native)
• not Winforms (i.e. native)
• GDI+ (i.e. native)

See also

• Aero: How to draw ClearType text on glass?
• Windows Aero: What color to paint to make "glass" appear?
• Vista/7: How to get glass color?

解决方案

Another day, another solution by me.

• Draw everything you want to appear on glass into a bitmap.
• Then, clear the form background with black color.
• Immediately after this, draw the bitmap on your form.

However (as with any other solution not using DrawThemeTextEx): Text rendering will not work correctly, because it always takes the back color of your form as an antialias/cleartype hint. Use DrawThemeTextEx instead, which also supports text with a glow effect behind.

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