Add fontconfig support.
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Quik.Media.Defaults/Linux/FontConfig.cs
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230
Quik.Media.Defaults/Linux/FontConfig.cs
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using System;
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using System.Runtime.InteropServices;
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using System.Runtime.CompilerServices;
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using System.Text;
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using Quik;
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namespace Quik.Media.Defaults
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{
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public static unsafe class FontConfig
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{
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private const string fontconfig = "fontconfig";
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public static bool Exists { get; }
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public static IntPtr FAMILY { get; } = Marshal.StringToHGlobalAnsi("family");
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public static IntPtr STYLE { get; } = Marshal.StringToHGlobalAnsi("style");
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public static IntPtr FILE { get; } = Marshal.StringToHGlobalAnsi("file");
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public static IntPtr WEIGHT { get; } = Marshal.StringToHGlobalAnsi("weight");
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public static IntPtr SLANT { get; } = Marshal.StringToHGlobalAnsi("slant");
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static FontConfig()
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{
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try
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{
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if (FcInitLoadConfigAndFonts() == null)
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{
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Exists = false;
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}
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Exists = true;
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}
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catch
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{
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Exists = false;
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}
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}
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[DllImport(fontconfig, EntryPoint = "FcInitLoadConfigAndFonts")]
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public static extern FcConfig* FcInitLoadConfigAndFonts();
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[DllImport(fontconfig, EntryPoint = "FcConfigGetCurrent")]
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public static extern FcConfig ConfigGetCurrent();
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[DllImport(fontconfig, EntryPoint = "FcPatternCreate")]
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public static extern FcPattern PatternCreate();
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[DllImport(fontconfig, EntryPoint = "FcPatternCreate")]
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public static extern bool FcPatternAdd(FcPattern pattern, IntPtr what, FcValue value, bool append);
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[DllImport(fontconfig, EntryPoint = "FcObjectSetBuild", CallingConvention = CallingConvention.Cdecl)]
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public static extern FcObjectSet ObjectSetBuild(IntPtr i1, IntPtr i2, IntPtr i3, IntPtr i4, IntPtr i5, IntPtr i6);
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public static FcObjectSet ObjectSetBuild(IntPtr i1)
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{
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return ObjectSetBuild(i1, IntPtr.Zero);
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}
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public static FcObjectSet ObjectSetBuild(IntPtr i1, IntPtr i2)
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{
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return ObjectSetBuild(i1, i2, IntPtr.Zero);
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}
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public static FcObjectSet ObjectSetBuild(IntPtr i1, IntPtr i2, IntPtr i3)
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{
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return ObjectSetBuild(i1, i2, i3, IntPtr.Zero);
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}
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public static FcObjectSet ObjectSetBuild(IntPtr i1, IntPtr i2, IntPtr i3, IntPtr i4)
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{
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return ObjectSetBuild(i1, i2, i3, i4, IntPtr.Zero);
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}
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public static FcObjectSet ObjectSetBuild(IntPtr i1, IntPtr i2, IntPtr i3, IntPtr i4, IntPtr i5)
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{
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return ObjectSetBuild(i1, i2, i3, i4, i5, IntPtr.Zero);
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}
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[DllImport(fontconfig, EntryPoint = "FcFontList")]
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public static extern FcFontSet FontList(FcConfig config, FcPattern pattern, FcObjectSet objectSet);
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[DllImport(fontconfig, EntryPoint = "FcNameUnparse")]
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public static extern IntPtr NameUnparse(FcPattern pat);
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public static string NameUnparseStr(FcPattern pat) => Marshal.PtrToStringAnsi(NameUnparse(pat));
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[DllImport(fontconfig, EntryPoint = "FcPatternGetString")]
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public static extern FcResult PatternGetString(FcPattern p, IntPtr what, int n, out IntPtr val);
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public static FcResult PatternGetString(FcPattern p, IntPtr what, out string str)
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{
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FcResult i = PatternGetString(p, what, 0, out IntPtr ptr);
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if (i == FcResult.Match)
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{
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str = Marshal.PtrToStringAnsi(ptr);
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}
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else
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{
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str = null;
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}
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Marshal.FreeHGlobal(ptr);
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return i;
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}
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[DllImport(fontconfig, EntryPoint = "FcPatternGet")]
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public static extern FcResult PatternGet(FcPattern p, IntPtr what, int id, out FcValue value);
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[DllImport(fontconfig, EntryPoint = "FcFontSetDestroy")]
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public static extern void FontSetDestroy(FcFontSet fs);
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[DllImport(fontconfig, EntryPoint = "FcObjectSetDestroy")]
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public static extern void ObjectSetDestroy (FcObjectSet os);
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[DllImport(fontconfig, EntryPoint = "FcConfigDestroy")]
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public static extern void ConfigDestroy (FcConfig cfg);
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[DllImport(fontconfig, EntryPoint = "FcPatternDestroy")]
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public static extern void PatternDestroy (FcPattern os);
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#region Range
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[DllImport(fontconfig, EntryPoint = "FcRangeCreateDouble")]
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public static extern IntPtr RangeCreateDouble(double begin, double end);
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[DllImport(fontconfig, EntryPoint = "FcRangeCreateInteger")]
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public static extern IntPtr RangeCreateInteger (int begin, int end);
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[DllImport(fontconfig, EntryPoint = "FcRangeDestroy")]
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public static extern void RangeDestroy(IntPtr range);
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[DllImport(fontconfig, EntryPoint = "FcRangeCopy")]
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public static extern IntPtr RangeCopy (IntPtr range);
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[DllImport(fontconfig, EntryPoint = "FcRangeGetDouble")]
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public static extern bool RangeGetDouble(IntPtr range, out double start, out double end);
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#endregion
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}
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public enum FcResult
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{
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Match,
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NoMatch,
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TypeMismatch,
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NoId,
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OutOfMemory
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}
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public struct FcConfig
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{
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public readonly IntPtr Handle;
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}
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public struct FcPattern
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{
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public readonly IntPtr Handle;
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}
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public unsafe struct FcObjectSet
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{
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public readonly IntPtr Handle;
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private Accessor* AsPtr => (Accessor*)Handle;
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public int NObject => AsPtr->nobject;
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public int SObject => AsPtr->sobject;
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#pragma warning disable CS0649 // Will always have default value.
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private struct Accessor
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{
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public int nobject;
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public int sobject;
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public byte** objects;
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}
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#pragma warning restore CS0649
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}
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public unsafe struct FcFontSet
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{
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public readonly IntPtr Handle;
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private Accessor* AsPtr => (Accessor*)Handle;
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public int NFont => AsPtr->nfont;
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public int SFont => AsPtr->sfont;
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public FcPattern this[int i]
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{
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get
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{
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if (i < 0 || i >= NFont)
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throw new IndexOutOfRangeException();
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return AsPtr->fonts[i];
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}
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}
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#pragma warning disable CS0649 // Will always have default value.
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private struct Accessor
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{
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public int nfont;
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public int sfont;
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public FcPattern* fonts;
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}
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#pragma warning restore CS0649
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}
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public enum FcType
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{
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Unknown = -1,
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Void,
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Integer,
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Double,
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String,
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Bool,
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Matrix,
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CharSet,
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FTFace,
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LangSet,
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Range
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}
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[StructLayout(LayoutKind.Explicit)]
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public readonly struct FcValue
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{
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[FieldOffset(0)] public readonly FcType Type;
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[FieldOffset(sizeof(FcType))] public readonly IntPtr Pointer;
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[FieldOffset(sizeof(FcType))] public readonly int Int;
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[FieldOffset(sizeof(FcType))] public readonly double Double;
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}
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}
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143
Quik.Media.Defaults/Linux/FontConfigFontDatabase.cs
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143
Quik.Media.Defaults/Linux/FontConfigFontDatabase.cs
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Runtime.InteropServices;
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using Quik.Media.Font;
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using Quik.PAL;
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namespace Quik.Media.Defaults.Linux
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{
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/// <summary>
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/// Font database for Linux libfontconfig systems.
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/// </summary>
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public class FontConfigFontDatabase : IFontDataBase
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{
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private IReadOnlyDictionary<FontFace, FileInfo> FilesMap { get; }
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private IReadOnlyDictionary<string, IReadOnlyList<FontFace>> ByFamily { get; }
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public IEnumerable<FontFace> All { get; }
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public FontConfigFontDatabase()
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{
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if (!FontConfig.Exists)
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{
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throw new NotSupportedException("This host doesn't have fontconfig installed.");
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}
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List<FontFace> faces = new List<FontFace>();
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Dictionary<FontFace, FileInfo> files = new Dictionary<FontFace, FileInfo>();
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Dictionary<string, List<FontFace>> byFamily = new Dictionary<string, List<FontFace>>();
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FcConfig config = FontConfig.ConfigGetCurrent();
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FcPattern pattern = FontConfig.PatternCreate();
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FcObjectSet os = FontConfig.ObjectSetBuild(FontConfig.FAMILY, FontConfig.STYLE, FontConfig.FILE);
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FcFontSet fs = FontConfig.FontList(config, pattern, os);
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for (int i = 0; i < fs.NFont; i++)
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{
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FcPattern current = fs[i];
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if (
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FontConfig.PatternGetString(current, FontConfig.FAMILY, 0, out IntPtr pFamily) != FcResult.Match ||
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FontConfig.PatternGetString(current, FontConfig.STYLE, 0, out IntPtr pStyle) != FcResult.Match)
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{
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continue;
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}
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string family = Marshal.PtrToStringUTF8(pFamily);
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string style = Marshal.PtrToStringUTF8(pStyle);
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FontFace face = FontFace.Parse(family, style);
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faces.Add(face);
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if (!byFamily.TryGetValue(face.Family, out List<FontFace> siblings))
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{
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siblings = new List<FontFace>();
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byFamily.Add(face.Family, siblings);
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}
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siblings.Add(face);
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FontConfig.PatternGetString(current, FontConfig.FILE, 0, out IntPtr pFile);
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string file = Marshal.PtrToStringAnsi(pFile);
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files.TryAdd(face, new FileInfo(file));
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}
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FontConfig.FontSetDestroy(fs);
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FontConfig.ObjectSetDestroy(os);
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FontConfig.PatternDestroy(pattern);
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All = faces.ToArray();
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FilesMap = files;
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ByFamily = new Dictionary<string, IReadOnlyList<FontFace>>(
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byFamily.Select(x =>
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new KeyValuePair<string, IReadOnlyList<FontFace>>(x.Key, x.Value)
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)
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);
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}
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public IEnumerable<FontFace> Search(FontFace prototype, FontMatchCriteria criteria = FontMatchCriteria.All)
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{
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// A bit scuffed and LINQ heavy but it should work.
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IEnumerable<FontFace> candidates;
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if (criteria.HasFlag(FontMatchCriteria.Family))
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{
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IReadOnlyList<FontFace> siblings;
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if (!ByFamily.TryGetValue(prototype.Family, out siblings))
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{
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return Enumerable.Empty<FontFace>();
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}
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candidates = siblings;
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}
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else
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{
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candidates = All;
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}
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return
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candidates
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.Where(x =>
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implies(criteria.HasFlag(FontMatchCriteria.Slant), prototype.Slant == x.Slant) ||
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implies(criteria.HasFlag(FontMatchCriteria.Weight), prototype.Weight == x.Weight) ||
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implies(criteria.HasFlag(FontMatchCriteria.Stretch), prototype.Stretch == x.Stretch)
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)
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.OrderByDescending(x =>
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(prototype.Slant == x.Slant ? 1 : 0) +
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(prototype.Weight == x.Weight ? 1 : 0) +
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(prototype.Stretch == x.Stretch ? 1 : 0) +
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confidence(prototype.Family, x.Family) * 3
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);
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// a => b = a'+b
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static bool implies(bool a, bool b)
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{
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return !a || b;
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}
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static int confidence(string target, string testee)
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{
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int i;
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for (i = 0; i < target.Length && i < testee.Length && target[i] == testee[i]; i++);
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return i;
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}
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}
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public FileInfo FontFileInfo(FontFace face)
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{
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if (FilesMap.TryGetValue(face, out FileInfo info))
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return info;
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else
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return null;
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}
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public Stream Open(FontFace face)
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{
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return FontFileInfo(face)?.OpenRead() ?? throw new FileNotFoundException();
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}
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}
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}
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