Fix EMF to PNG conversion issue #362

- Add EMF-specific handling in ImageMagick converter to avoid LibreOffice delegate issues
- Disable EMF delegate and set proper conversion parameters (density: 300, background: white, alpha: remove)
- Prioritize Inkscape over ImageMagick for EMF files as it handles them natively
- Resolves LibreOffice delegate command failures when converting EMF files

Fixes #362

src/converters/imagemagick.ts

@@ -460,6 +460,13 @@ export function convert(
     }
   }
 
+  // Handle EMF files specifically to avoid LibreOffice delegate issues
+  if (fileType === "emf") {
+    // Use direct conversion without delegates for EMF files
+    inputArgs = ["-define", "emf:delegate=false", "-density", "300"];
+    outputArgs = ["-background", "white", "-alpha", "remove"];
+  }
+
   return new Promise((resolve, reject) => {
     execFile(
       "magick",

src/converters/main.ts

@@ -47,6 +47,11 @@ const properties: Record<
     ) => unknown;
   }
 > = {
+  // Prioritize Inkscape for EMF files as it handles them better than ImageMagick
+  inkscape: {
+    properties: propertiesInkscape,
+    converter: convertInkscape,
+  },
   libjxl: {
     properties: propertiesLibjxl,
     converter: convertLibjxl,
@@ -87,10 +92,6 @@ const properties: Record<
     properties: propertiesGraphicsmagick,
     converter: convertGraphicsmagick,
   },
-  inkscape: {
-    properties: propertiesInkscape,
-    converter: convertInkscape,
-  },
   assimp: {
     properties: propertiesassimp,
     converter: convertassimp,