Simplified Chinese text wrapping does not take effect

[StandOutstar]

Prerequisites

• I have written a descriptive issue title
• I have verified that I am running the latest version of ImageSharp
• I have verified if the problem exist in both DEBUG and RELEASE mode
• I have searched open and closed issues to ensure it has not already been reported

Description

Steps to Reproduce

1. create a .net 5 console app
2. install SixLabors.ImageSharp.Drawing version 1.0.0-beta11
3. load a image, then write simplified chinese text

image.Mutate(x => x.
    DrawText(
        new TextGraphicsOptions()
        {
            TextOptions = new TextOptions
            {
                WrapTextWidth = 800,
            }
        }, 
        "这是一段长度超出设定的换行宽度的文本，但是没有在设定的宽度处换行。这段文本用于演示问题。希望可以修复。如果有需要可以联系我。",
        textFont,
        Color.Black,
        new PointF(300, 200)
    ));

System Configuration

• ImageSharp version: 1.0.0-beta11
• Other ImageSharp packages and versions:
• Environment (Operating system, version and so on): macOS 10.15.7
• .NET Framework version: 5.0.0
• Additional information:

[JimBobSquarePants]

Confirmed using the following code with ImageSharp.Drawing 1.0.0-beta11.2 on Windows.

using SixLabors.Fonts;
using SixLabors.ImageSharp;
using SixLabors.ImageSharp.Drawing.Processing;
using SixLabors.ImageSharp.PixelFormats;
using SixLabors.ImageSharp.Processing;
using System.IO;

namespace ISD_115
{
    class Program
    {
        static void Main(string[] args)
        {
            var fonts = new string[] { "SimSun", "NSimSun" };

            for (int i = 0; i < fonts.Length; i++)
            {
                using (var image = new Image<Rgba32>(1100, 200, Color.White))
                {
                    image.Mutate(x => x.DrawText(
                        new TextGraphicsOptions()
                        {
                            TextOptions = new TextOptions
                            {
                                WrapTextWidth = 400,
                            }
                        },
                        "这是一段长度超出设定的换行宽度的文本，但是没有在设定的宽度处换行。这段文本用于演示问题。希望可以修复。如果有需要可以联系我。",
                        SystemFonts.Find(fonts[i]).CreateFont(16),
                        Color.Black,
                        Point.Empty));

                    image.Save(Path.GetFullPath(Path.Combine(Directory.GetCurrentDirectory(), $"../../../output/{fonts[i].ToLower()}.png")));
                }
            }

        }
    }
}

NSimSun

SimSun

[tocsoft]

This is due to the face we only have rules for whitespace based wrapping and Chinese generally doesn't use whitespace for wrapping it has some other system.

We would need/want to look at implementing the real full unicode line breaking algorithm. to support this correctly.

[JimBobSquarePants]

Just found an implementation with MIT license we could potentially use to help us implement. https://github.com/foliojs/linebreak

C# Port. Apache 2.0
https://github.com/toptensoftware/RichTextKit/tree/a2733e43ba8484032adfb1defbdde41c09986e7f/Topten.RichTextKit/Unicode