Merge pull request #331 from SixLabors/issue330-offset-outline

Align font outline and fill while calling DrawText

.github/workflows/build-and-test.yml

@@ -23,7 +23,7 @@ jobs:
             sdk-preview: true
             runtime: -x64
             codecov: false
-          - os: macos-latest
+          - os: macos-13 # macos-latest runs on arm64 runners where libgdiplus is unavailable
             framework: net7.0
             sdk: 7.0.x
             sdk-preview: true
@@ -46,7 +46,7 @@ jobs:
             sdk: 6.0.x
             runtime: -x64
             codecov: false
-          - os: macos-latest
+          - os: macos-13 # macos-latest runs on arm64 runners where libgdiplus is unavailable
             framework: net6.0
             sdk: 6.0.x
             runtime: -x64

src/ImageSharp.Drawing/Processing/Processors/Text/RichTextGlyphRenderer.cs

@@ -367,9 +367,10 @@ protected override void EndGlyph()
 
         if (renderData.OutlineMap != null)
         {
+            int offset = (int)((this.currentPen?.StrokeWidth ?? 0) / 2);
             this.DrawingOperations.Add(new DrawingOperation
             {
-                RenderLocation = renderLocation,
+                RenderLocation = renderLocation - new Size(offset, offset),
                 Map = renderData.OutlineMap,
                 Brush = this.currentPen?.StrokeFill ?? this.currentBrush!,
                 RenderPass = RenderOrderOutline

tests/ImageSharp.Drawing.Tests/Issues/Issue_330.cs

@@ -0,0 +1,68 @@
+// Copyright (c) Six Labors.
+// Licensed under the Six Labors Split License.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using SixLabors.Fonts;
+using SixLabors.ImageSharp.Drawing.Processing;
+using SixLabors.ImageSharp.PixelFormats;
+
+namespace SixLabors.ImageSharp.Drawing.Tests.Issues;
+public class Issue_330
+{
+    [Theory]
+    [WithSolidFilledImages(2084, 2084, "BlueViolet", PixelTypes.Rgba32)]
+    public void OffsetTextOutlines<TPixel>(TestImageProvider<TPixel> provider)
+        where TPixel : unmanaged, IPixel<TPixel>
+    {
+        FontFamily fontFamily = TestFontUtilities.GetFontFamily(TestFonts.OpenSans);
+
+        Font bibfont = fontFamily.CreateFont(600, FontStyle.Bold);
+        Font namefont = fontFamily.CreateFont(140, FontStyle.Bold);
+
+        provider.RunValidatingProcessorTest(p =>
+        {
+            p.DrawText(
+                new RichTextOptions(bibfont)
+                {
+                    VerticalAlignment = VerticalAlignment.Center,
+                    HorizontalAlignment = HorizontalAlignment.Center,
+                    TextAlignment = TextAlignment.Center,
+                    TextDirection = TextDirection.LeftToRight,
+                    Origin = new Point(1156, 1024),
+                },
+                "9999",
+                Brushes.Solid(Color.White),
+                Pens.Solid(Color.Black, 20));
+
+            p.DrawText(
+                new RichTextOptions(namefont)
+                {
+                    VerticalAlignment = VerticalAlignment.Center,
+                    HorizontalAlignment = HorizontalAlignment.Center,
+                    TextAlignment = TextAlignment.Center,
+                    TextDirection = TextDirection.LeftToRight,
+                    Origin = new Point(1156, 713),
+                },
+                "JOHAN",
+                Brushes.Solid(Color.White),
+                Pens.Solid(Color.Black, 5));
+
+            p.DrawText(
+                new RichTextOptions(namefont)
+                {
+                    VerticalAlignment = VerticalAlignment.Center,
+                    HorizontalAlignment = HorizontalAlignment.Center,
+                    TextAlignment = TextAlignment.Center,
+                    TextDirection = TextDirection.LeftToRight,
+                    Origin = new Point(1156, 1381),
+                },
+                "TIGERTECH",
+                Brushes.Solid(Color.White),
+                Pens.Solid(Color.Black, 5));
+        });
+    }
+}

tests/ImageSharp.Drawing.Tests/TestFontUtilities.cs

@@ -1,6 +1,7 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 
+using System.Globalization;
 using System.Reflection;
 using SixLabors.Fonts;
 using IOPath = System.IO.Path;
@@ -19,7 +20,15 @@ public static class TestFontUtilities
     /// <param name="size">The font size.</param>
     /// <returns>The <see cref="Font"/></returns>
     public static Font GetFont(string name, float size)
-        => GetFont(new FontCollection(), name, size);
+        => GetFontFamily(name).CreateFont(size);
+
+    /// <summary>
+    /// Gets a font family with the given name.
+    /// </summary>
+    /// <param name="name">The name of the font.</param>
+    /// <returns>The <see cref="Font"/></returns>
+    public static FontFamily GetFontFamily(string name)
+        => GetFontFamily(new FontCollection(), name);
 
     /// <summary>
     /// Gets a font with the given name and size.
@@ -29,7 +38,16 @@ public static Font GetFont(string name, float size)
     /// <param name="size">The font size.</param>
     /// <returns>The <see cref="Font"/></returns>
     public static Font GetFont(FontCollection collection, string name, float size)
-        => collection.Add(GetPath(name)).CreateFont(size);
+        => GetFontFamily(collection, name).CreateFont(size);
+
+    /// <summary>
+    /// Gets a font family with the given name
+    /// </summary>
+    /// <param name="collection">The collection to add the font to</param>
+    /// <param name="name">The name of the font.</param>
+    /// <returns>The <see cref="Font"/></returns>
+    public static FontFamily GetFontFamily(FontCollection collection, string name)
+        => collection.Add(GetPath(name), CultureInfo.InvariantCulture);
 
     /// <summary>
     /// The formats directory.