Aero:如何在玻璃上绘制纯色(不透明)颜色？

Question

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:


如何在玻璃上绘制纯色？

您还会注意到，完全不透明的颜色会根据它的颜色进行不同的处理:

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

谁能指出我在桌面合成器上解释如何处理不同颜色的文档？

更新 3

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

FillEllipse with an opaque color 绘制不透明颜色

FillRectangle使用不透明颜色绘制部分(或完全)透明

请解释无意义的行为。

更新 4

Alwayslearning建议我更改合成模式。来自 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.

来自 CompositingModeSourceCopy 的描述，听起来这不是我想要的选项。从它施加的限制来看，这听起来像是我想要的选择。使用合成或透明度禁用它 不是 我想要的选项，因为它执行 SourceCopy ，而不是 SourceBlend :



幸运的是，这不是我必须考虑的邪恶，因为它不能解决我的实际问题。构建我的 graphics 之后对象，我尝试更改合成模式:

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

结果对输出没有影响:



笔记

Win32原生

不是 .NET(即 native )

不是 Winforms(即 native )

GDI+(即原生)

也可以看看

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?

Answer 1

对我来说似乎工作正常。由于缺乏完整的代码示例，我假设您的合成模式错误。

public void RenderGdiPlus()
{
    List<string> colors = new List<string>(new string[] { "000000", "ff0000", "00ff00", "0000ff", "ffffff" });
    List<string> alphas = new List<string>(new string[] { "00", "01", "40", "80", "c0", "fe", "ff" });
    Bitmap bmp = new Bitmap(200, 300, System.Drawing.Imaging.PixelFormat.Format32bppArgb);

    Graphics graphics = Graphics.FromImage(bmp);
    graphics.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
    graphics.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.None;
    graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.None;

    graphics.CompositingMode = System.Drawing.Drawing2D.CompositingMode.SourceCopy;
    graphics.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
    SolidBrush backBrush = new SolidBrush(Color.FromArgb(254, 131, 208, 129));
    graphics.FillRectangle(backBrush, 0, 0, 300, 300);

    graphics.CompositingMode = System.Drawing.Drawing2D.CompositingMode.SourceOver;
    Pen pen = new Pen(Color.Gray);
    for (int row = 0; row < alphas.Count; row++)
    {
        string alpha = alphas[row];
        for (int column=0; column<colors.Count; column++)
        {
            string color = "#" + alpha + colors[column];
            SolidBrush brush = new SolidBrush(ColorTranslator.FromHtml(color));
            graphics.DrawRectangle(pen, 40*column, 40*row, 32, 32);
            graphics.FillRectangle(brush, 1+40*column, 1+40*row, 31, 31);
        }
    }

    Graphics gr2 = Graphics.FromHwnd(this.Handle);
    gr2.CompositingMode = System.Drawing.Drawing2D.CompositingMode.SourceCopy;
    gr2.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
    gr2.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.None;
    gr2.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.None;
    gr2.DrawImage(bmp, 0, 0);
}