如何在.NET中创建子集字体?

本地API CreateFontPackage 可能是你想要的。您可以传递TTF和要保留的字符列表。如果你通过 TTFCFP_SUBSET 对于 usSubsetFormat 然后,您将得到一个只包含这些字符的有效TTF。

Here's a thread 使用一个工作示例的代码(不幸的是,在C中)。

在字体的WPF中有静态和动态链接。所有这些都可以在混合中定义。对于字体的静态链接,只编译和嵌入所需的字符。通过动态链接,嵌入所有字体集。因此,请尝试为所选字体设置静态链接,并尝试是否有效。

UPD

尝试向您添加以下代码 .csproj 文件。这里我们包括了Tahoma字体。autofill属性设置为true表示我们将嵌入控件的仅用于程序集的字符。一组字符 <Charachters/> 标记填充点以将这些字符包含到程序集中。所有其他标签都设置为假,因为我们不需要它们。

<ItemGroup>
    <BlendEmbeddedFont Include="Fonts\tahoma.ttf">
      <IsSystemFont>True</IsSystemFont>
      <All>False</All>
      <AutoFill>True</AutoFill>
      <Characters>dasf</Characters>
      <Uppercase>False</Uppercase>
      <Lowercase>False</Lowercase>
      <Numbers>False</Numbers>
      <Punctuation>False</Punctuation>
    </BlendEmbeddedFont>
    <BlendEmbeddedFont Include="Fonts\tahomabd.ttf">
      <IsSystemFont>True</IsSystemFont>
      <All>False</All>
      <AutoFill>True</AutoFill>
      <Characters>dasf</Characters>
      <Uppercase>False</Uppercase>
      <Lowercase>False</Lowercase>
      <Numbers>False</Numbers>
      <Punctuation>False</Punctuation>
    </BlendEmbeddedFont>
  </ItemGroup>
  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />

  <Import Project="$(MSBuildExtensionsPath)\Microsoft\Expression\Blend\3.0\WPF\Microsoft.Expression.Blend.WPF.targets" />

更改此问题的已接受答案,因为它是纯.NET,没有外部引用。使用.NET 4:

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

我知道这是个老问题,但我发现很难使用 CreateFontPackage 来自C(如@josh3736的答案所述)的API,所以我想共享我的代码。

我将API与glyphIndexs一起使用,您可以通过删除 TTFCFP_FLAGS_GLYPHLIST 旗帜。

这是我的代码:

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
);

我只在TTF文件中使用代码,对于TTC(字体集合),您必须更改一些内容,但是它仍然可以工作。

FontForge http://fontforge.sourceforge.net/ )是一个允许自动格式转换的开源字体编辑器。看起来它只是Python,但可能值得一看。