FillRegionProcessor.OnFrameApply IndexOutOfRangeException when calling DrawLines with specific parameters

[woutware]

Description

Bug

Steps to Reproduce

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Numerics;
using System.Text;
using SixLabors.Fonts;
using SixLabors.ImageSharp;
using SixLabors.ImageSharp.PixelFormats;
using SixLabors.ImageSharp.Processing;
using SixLabors.ImageSharp.Processing.Drawing;
using SixLabors.ImageSharp.Processing.Overlays;
using SixLabors.ImageSharp.Processing.Text;
using SixLabors.Primitives;
using SixLabors.Shapes;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            DrawLinesBug(@"D:\support\ImageSharp\DrawLinesBug.png", new RectangleF(0, 0, 2000, 2000));
            
            Console.WriteLine("Hello World!");
            Console.ReadLine();
        }

        public static void DrawLinesBug(string savePath, RectangleF rectText) {
            using (Image<Rgba32> img = new Image<Rgba32>((int)rectText.Width, (int)rectText.Height)) {
                img.Mutate(x => x.Fill(Rgba32.Transparent));

                img.Mutate(ctx => {
                    ctx.DrawLines(
                        Rgba32.Red,
                        0.984252f,
                        new PointF(104.762581f, 1074.99365f),
                        new PointF(104.758667f, 1075.01721f),
                        new PointF(104.757675f, 1075.04114f),
                        new PointF(104.759628f, 1075.065f),
                        new PointF(104.764488f, 1075.08838f),
                        new PointF(104.772186f, 1075.111f),
                        new PointF(104.782608f, 1075.13245f),
                        new PointF(104.782608f, 1075.13245f)
                        );
                    }
                );

                SixLabors.ImageSharp.Formats.Png.PngEncoder pngEncoder = new SixLabors.ImageSharp.Formats.Png.PngEncoder();
                pngEncoder.CompressionLevel = 0;

                FileStream fileStream = new FileStream(savePath, FileMode.OpenOrCreate);
                img.SaveAsPng(fileStream, pngEncoder);
            }
        }
    }
}

System Configuration

Win 10, .NET Core 2.0

• ImageSharp version: 1.0.0-beta0006
• Other ImageSharp packages and versions:
• Environment (Operating system, version and so on):
• .NET Framework version:
• Additional information:

[JimBobSquarePants]

Hi @woutware Thanks for supplying all the info.

Is the issue still present in the latest development builds from MyGet?

[woutware]

My git skills are rusty, I did a Pull in GitHub desktop on the ImageSharp repository, that should get me the latest sources isn't it?

[woutware]

Still using https://github.com/woutware/ImageSharp.git that I used last year to build locally.

[woutware]

Oh shit that's my own fork. How do I synch it again?

[woutware]

Ok, it was git pull upstream master. My local build is totally broken though with all the changes, I'll need to look at it closer in the weekend, but my guess is the bug is still there, it's pretty circumstantial.

[101100]

@woutware This was fixed in #964. I was able to test it in my project using the nightly build 1.0.0-dev002846 on MyGet.