Added: Font fallback structure for the default fonts. (#217)

* Added: Font fallback structure for the default fonts. * Improved: DejaVu Sans Mono as first mono type Improved: Courier New is more often available than Courier * Added: Roboto font to Dockerfile
BinaryKits · Apr 23, 2024 · cb12101 · cb12101
1 parent 2150dac
commit cb12101
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Showing 2 changed files with 88 additions and 3 deletions.
diff --git a/src/BinaryKits.Zpl.Viewer/ElementDrawers/DrawerOptions.cs b/src/BinaryKits.Zpl.Viewer/ElementDrawers/DrawerOptions.cs
@@ -1,6 +1,7 @@
 using SkiaSharp;
 using System;
 using System.Diagnostics;
+using System.Linq;
 
 namespace BinaryKits.Zpl.Viewer.ElementDrawers
 {
@@ -21,14 +22,97 @@ public class DrawerOptions
 
         public static Func<string, SKTypeface> DefaultFontLoader = fontName => {
             var typeface = SKTypeface.Default;
+            var skFontManager = SKFontManager.Default;
+            var fontFamilies = skFontManager.FontFamilies;
+            
             if (fontName == "0")
             {
-                //typeface = SKTypeface.FromFile(@"swiss-721-black-bt.ttf");
-                typeface = SKTypeface.FromFamilyName("Helvetica", SKFontStyleWeight.Bold, SKFontStyleWidth.SemiCondensed, SKFontStyleSlant.Upright);
+                if (fontFamilies.Contains("Helvetica"))
+                {
+                    typeface = SKTypeface.FromFamilyName(
+                        "Helvetica",
+                        SKFontStyleWeight.Bold,
+                        SKFontStyleWidth.SemiCondensed,
+                        SKFontStyleSlant.Upright
+                    );
+                }
+                else if (fontFamilies.Contains("Roboto Condensed"))
+                {
+                    typeface = SKTypeface.FromFamilyName(
+                        "Roboto Condensed",
+                        SKFontStyleWeight.Bold,
+                        SKFontStyleWidth.Normal,
+                        SKFontStyleSlant.Upright
+                    );
+                }
+                else if (fontFamilies.Contains("Swis721 BT"))
+                {
+                    //Note: Zebra Swis721 BT (tt0003m_.ttf) is not as bold and condensed as Labelary
+                    //Note: swiss-721-bt-bold.ttf is not as condensed as Labelary
+                    //typeface = SKTypeface.FromFile(@"swiss-721-black-bt.ttf");
+                    typeface = SKTypeface.FromFamilyName(
+                        "Swis721 BT"
+                    );
+                }
+                else if (fontFamilies.Contains("Arial"))
+                {
+                    typeface = SKTypeface.FromFamilyName(
+                        "Arial",
+                        SKFontStyleWeight.Bold,
+                        SKFontStyleWidth.Condensed,
+                        SKFontStyleSlant.Upright
+                    );
+                }
+                else
+                {
+                    //let the system provide a fallback for Helvetica
+                    typeface = SKTypeface.FromFamilyName(
+                        "Helvetica",
+                        SKFontStyleWeight.Bold,
+                        SKFontStyleWidth.SemiCondensed,
+                        SKFontStyleSlant.Upright
+                    );
+                }
             }
             else
             {
-                typeface = SKTypeface.FromFamilyName("DejaVu Sans Mono", SKFontStyleWeight.Normal, SKFontStyleWidth.Normal, SKFontStyleSlant.Upright);
+                if (fontFamilies.Contains("DejaVu Sans Mono"))
+                {
+                    typeface = SKTypeface.FromFamilyName(
+                        "DejaVu Sans Mono",
+                        SKFontStyleWeight.Normal,
+                        SKFontStyleWidth.Normal,
+                        SKFontStyleSlant.Upright
+                    );
+                }
+                else if (fontFamilies.Contains("Courier New"))
+                {
+                    typeface = SKTypeface.FromFamilyName(
+                        "Courier New",
+                        SKFontStyleWeight.Medium,
+                        SKFontStyleWidth.Normal,
+                        SKFontStyleSlant.Upright
+                    );
+                }
+                else if (fontFamilies.Contains("Courier"))
+                {
+                    typeface = SKTypeface.FromFamilyName(
+                        "Courier",
+                        SKFontStyleWeight.Medium,
+                        SKFontStyleWidth.Normal,
+                        SKFontStyleSlant.Upright
+                    );
+                }
+                else
+                {
+                    //let the system provide a fallback for DejaVu
+                    typeface = SKTypeface.FromFamilyName(
+                        "DejaVu Sans Mono",
+                        SKFontStyleWeight.Normal,
+                        SKFontStyleWidth.Normal,
+                        SKFontStyleSlant.Upright
+                    );
+                }
             }
 
             return typeface;

diff --git a/src/Dockerfile b/src/Dockerfile
@@ -8,6 +8,7 @@ RUN apt-get update \
     libc6-dev \
     libgdiplus \
     libx11-dev \
+    fonts-roboto \
  && rm -rf /var/lib/apt/lists/*
 
 WORKDIR /app