Comment créer des polices de sous-ensemble dans .NET?

Fontforge ( http://fontforge.sourceforge.net/ ) est un éditeur de polices open source qui Permet des conversions de format automatisées. On dirait que c'est seulement python mais cela peut valoir la peine de vérifier.

Modification de la réponse acceptée à celle-ci, car elle est pure .Net sans références externes. Utilise .NET 4.0:

Imports System.Windows.Media
Imports System.Text.Encoding
Imports System.Collections

Public Sub CreateSubSet(sourceText As String, fontURI As Uri)
    Dim gt As FontEmbeddingManager = New FontEmbeddingManager

    Dim glyphTypeface As GlyphTypeface = New GlyphTypeface(fontURI)
    Dim Index As Generic.ICollection(Of UShort)
    Index = New Generic.List(Of UShort)
    Dim sourceTextBytes As Byte() = Unicode.GetBytes(sourceText)
    Dim sourceTextChars As Char() = Unicode.GetChars(sourceTextBytes)
    Dim sourceTextCharVal As Integer
    Dim glyphIndex As Integer
    For sourceTextCharPos = 0 To UBound(sourceTextChars)
        sourceTextCharVal = AscW(sourceTextChars(sourceTextCharPos))
        glyphIndex = glyphTypeface.CharacterToGlyphMap(sourceTextCharVal)
        Index.Add(glyphIndex)
    Next
    Dim filebytes() As Byte = glyphTypeface.ComputeSubset(Index)
    Using fileStream As New System.IO.FileStream("C:\Users\Me\new-subset.ttf", System.IO.FileMode.Create)
        fileStream.Write(filebytes, 0, filebytes.Length)
    End Using
End Sub

Je sais que c'est une vieille question, mais j'ai trouvé très difficile d'utiliser le Createefontpackage Code> API de C # (comme indiqué par la réponse de @ Josh3736), donc je pensais partager mon code.

Je suis Utilisation de l'API avec les glyphindices, vous pouvez l'utiliser directement avec les caractères en supprimant le drapeau ttfcfp_flags_glyphlist code>. p>

Ceci est mon code: P>

public byte[] CreateSubset(byte[] inputData, IEnumerable<ushort> glyphIndices)
{
    AllocProc allocProc = Marshal.AllocHGlobal;
    ReallocProc reallocProc = (p, c) =>
        p == IntPtr.Zero
            ? Marshal.AllocHGlobal(c)
            : Marshal.ReAllocHGlobal(p, c);
    FreeProc freeProc = Marshal.FreeHGlobal;

    var resultCode = CreateFontPackage(
        inputData, (uint) inputData.Length,
        out var bufferPtr,
        out _,
        out var bytesWritten,
        TTFCFP_FLAGS_SUBSET | TTFCFP_FLAGS_GLYPHLIST,
        0,
        TTFMFP_SUBSET,
        0,
        TTFCFP_MS_PLATFORMID,
        TTFCFP_UNICODE_CHAR_SET,
        glyphIndices,
        (ushort)glyphIndices.Length,
        allocProc, reallocProc, freeProc, (IntPtr)0);

    if (resultCode != 0 || bufferPtr == IntPtr.Zero)
    {
        return null;
    }

    try
    {
        var buffer = new byte[bytesWritten];
        Marshal.Copy(bufferPtr, buffer, 0, buffer.Length);
        return buffer;
    }
    finally
    {
        freeProc(bufferPtr);
    }
}

internal const ushort TTFCFP_FLAGS_SUBSET = 0x0001;
internal const ushort TTFCFP_FLAGS_COMPRESS = 0x0002;
internal const ushort TTFCFP_FLAGS_TTC = 0x0004;
internal const ushort TTFCFP_FLAGS_GLYPHLIST = 0x0008;

internal const ushort TTFMFP_SUBSET = 0x0000;

internal const ushort TTFCFP_UNICODE_PLATFORMID = 0x0000;
internal const ushort TTFCFP_MS_PLATFORMID = 0x0003;

internal const ushort TTFCFP_UNICODE_CHAR_SET = 0x0001;

[UnmanagedFunctionPointer(CallingConvention.Cdecl, CharSet = CharSet.Unicode)]
private delegate IntPtr AllocProc(Int32 size);

[UnmanagedFunctionPointer(CallingConvention.Cdecl, CharSet = CharSet.Unicode)]
private delegate IntPtr ReallocProc(IntPtr memBlock, IntPtr size);

[UnmanagedFunctionPointer(CallingConvention.Cdecl, CharSet = CharSet.Unicode)]
private delegate void FreeProc(IntPtr memBlock);

[DllImport("FontSub.dll", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi, ExactSpelling = true)]
private static extern uint CreateFontPackage(
    [In, MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 1)]
    byte[] puchSrcBuffer,
    uint ulSrcBufferSize,
    out IntPtr puchFontPackageBufferPtr,
    out uint pulFontPackageBufferSize,
    out uint pulBytesWritten,
    ushort usFlags,
    ushort usTtcIndex,
    ushort usSubsetFormat,
    ushort usSubsetLanguage,
    ushort usSubsetPlatform,
    ushort usSubsetEncoding,
    [In, MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 12)]
    ushort[] pusSubsetKeepList,
    ushort usSubsetKeepListCount,
    AllocProc lpfnAllocate,
    ReallocProc lpfnReAllocate,
    FreeProc lpfnFree,
    IntPtr lpvReserved
);