Question

我正在使用SharpDX编写C＃Direct2D应用程序，但是我可以理解C ++中提供的答案/示例。

我想渲染文字并将某些字符的宽度更改为图片：

字母B扩大到200％，字母D减少到50％

在下面的代码中，我绘制了字形的几何形状因此可以改变几何的宽度但这不是一个好的解决方案，因为几何图形在图片中看起来很模糊。

总之，有两个问题：

我如何更改字符的宽度？

如何在不模糊的情况下绘制字母的几何形状。（可以用ClearType渲染几何体吗？）

private void RenderGlyphRun1(FontFace1 fontFace)
{
    var Offsets = new List<GlyphOffset>();
    var fontEmSize_ = 12;
    GlyphRun glyphRun = new GlyphRun();
    glyphRun.FontFace = fontFace;
    glyphRun.FontSize = fontEmSize_;
    glyphRun.BidiLevel = 1;
    var left = 650f;
    var top = 50f;

    var baseLine = (float)(fontFace.Metrics.LineGap + fontFace.Metrics.Ascent) /
        fontFace.Metrics.DesignUnitsPerEm * glyphRun.FontSize;

    string textToDraw = "ABCDE";
    foreach (char letter in textToDraw)
    {
        Offsets.Add(new GlyphOffset());
    }

    var charArr = textToDraw.Select(x => (int)x).ToArray();
    glyphRun.Indices = fontFace.GetGlyphIndices(charArr);

    var metrics = fontFace.GetDesignGlyphMetrics(glyphRun.Indices, false);
    glyphRun.Advances = metrics.Select(x => (float)x.AdvanceWidth /
             fontFace.Metrics.DesignUnitsPerEm * glyphRun.FontSize).ToArray();

    glyphRun.Offsets = Offsets.ToArray();

    RenderTarget2D.BeginDraw();
    RenderTarget2D.Clear(SharpDX.Color.White);

    RenderTarget2D.DrawGlyphRun(new Vector2(left, top),
        glyphRun, new SharpDX.Direct2D1.SolidColorBrush(RenderTarget2D, SharpDX.Color.Black),
        MeasuringMode.Natural);

    top += baseLine;

    var pathGeometry = new PathGeometry(Factory2D);
    var geometrySink = pathGeometry.Open();

    fontFace.GetGlyphRunOutline(glyphRun.FontSize, glyphRun.Indices,
        glyphRun.Advances, glyphRun.Offsets, glyphRun.IsSideways,
        glyphRun.BidiLevel % 2 != 0, geometrySink);

    geometrySink.Close();
    geometrySink.Dispose();
    fontFace.Dispose();

    var matrix = new Matrix3x2()
    {
        M11 = 1,
        M12 = 0,
        M21 = 0,
        M22 = 1,
        M31 = left,
        M32 = top
    };

    var transformedGeometry = new TransformedGeometry(Factory2D, pathGeometry, matrix);
    var brushColor = (Color4)SharpDX.Color.Black;
    var brush = new SolidColorBrush(RenderTarget2D, brushColor);
    RenderTarget2D.FillGeometry(transformedGeometry, brush);

    pathGeometry.Dispose();
    transformedGeometry.Dispose();
    brush.Dispose();

    RenderTarget2D.EndDraw();
}

Answer 1

由于有些字母应该窄一些，有些是正常的，有些则有些宽，因此您不能使用一个GlyphRun，而必须创建3个不同的GlyphRun。

要使任何GlyphRun的所有字母变宽或变窄：

将Transform配置为RenderTarget
绘制GlyphRun
退回原始Transform

宽范围转换：RenderTarget2D.Transform = new SharpDX.Mathematics.Interop.RawMatrix3x2(1.5f, 0, 0, 1, 0, 0);

窄变换：RenderTarget2D.Transform = new SharpDX.Mathematics.Interop.RawMatrix3x2(0.5f, 0, 0, 1, 0, 0);

使用此解决方案后，您无需将GlyphRun转换为geometry并与模糊字母混在一起。

Answer 2

Direct2D文本呈现功能分为两个部分：

1）DrawText和DrawTextLayout方法，使调用者可以传递字符串和格式参数或DWrite文本布局对象以获取多种格式。这应该适合大多数呼叫者。

2）第二种方法是呈现为DrawGlyphRun方法的文本呈现方式，为已经知道要呈现的字形位置的客户提供光栅化功能。以下两个通用规则可以帮助提高在Direct2D中进行绘制时的文本性能。

我现在看到您正在使用第二种方法，但是在第一种方法中，您可以将渲染设置为ClearType：

RenderTarget2D.TextAntialiasMode = TextAntialiasMode.Cleartype;

我不确定如何在您的示例中包括它，但是Sharp DX示例看起来像这样：

using System;
using SharpDX;
using SharpDX.Direct2D1;
using SharpDX.DirectWrite;
using SharpDX.Samples;
using TextAntialiasMode = SharpDX.Direct2D1.TextAntialiasMode;

namespace TextRenderingApp
{
  public class Program : Direct2D1DemoApp
  {        
    public TextFormat TextFormat { get; private set; }
    public TextLayout TextLayout { get; private set; }

    protected override void Initialize(DemoConfiguration demoConfiguration)
    {
        base.Initialize(demoConfiguration);

        // Initialize a TextFormat
        TextFormat = new TextFormat(FactoryDWrite, "Calibri", 128) {TextAlignment = TextAlignment.Center, ParagraphAlignment = ParagraphAlignment.Center};

        RenderTarget2D.TextAntialiasMode = TextAntialiasMode.Cleartype;

        // Initialize a TextLayout
        TextLayout = new TextLayout(FactoryDWrite, "SharpDX D2D1 - DWrite", TextFormat, demoConfiguration.Width, demoConfiguration.Height);
    }


    protected override void Draw(DemoTime time)
    {
        base.Draw(time);

        // Draw the TextLayout
        RenderTarget2D.DrawTextLayout(new Vector2(0,0), TextLayout, SceneColorBrush, DrawTextOptions.None );
    }


    [STAThread]
    static void Main(string[] args)
    {
        Program program = new Program();
        program.Run(new DemoConfiguration("SharpDX DirectWrite Text Rendering Demo"));
    }
  }
}

样本取自：https://github.com/sharpdx/SharpDX-Samples/blob/master/Desktop/Direct2D1/TextRenderingApp

SharpDx：设置字符宽度

2 个答案: