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use tryget rather than lambdas for union type

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avoid the allocations caused by lambda expressions for performance reasons.
This commit is contained in:
Eliot Jones
2020-02-28 16:02:20 +00:00
parent 4d911fb9d1
commit 4442a69a97
9 changed files with 141 additions and 55 deletions
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38
src/UglyToad.PdfPig.Core/Union.cs
View File

@@ -19,6 +19,16 @@ namespace UglyToad.PdfPig.Core
/// </summary>
public abstract TResult Match<TResult>(Func<A, TResult> first, Func<B, TResult> second);
/// <summary>
/// Get the item if it is of the specific type.
/// </summary>
public abstract bool TryGetFirst(out A a);
/// <summary>
/// Get the item if it is of the specific type.
/// </summary>
public abstract bool TryGetSecond(out B b);
private Union() { }
/// <summary>
@@ -69,6 +79,20 @@ namespace UglyToad.PdfPig.Core
return first(Item);
}
/// <inheritdoc />
public override bool TryGetFirst(out A a)
{
a = Item;
return true;
}
/// <inheritdoc />
public override bool TryGetSecond(out B b)
{
b = default(B);
return false;
}
/// <inheritdoc />
public override string ToString()
{
@@ -108,6 +132,20 @@ namespace UglyToad.PdfPig.Core
return second(Item);
}
/// <inheritdoc />
public override bool TryGetFirst(out A a)
{
a = default(A);
return false;
}
/// <inheritdoc />
public override bool TryGetSecond(out B b)
{
b = Item;
return true;
}
/// <inheritdoc />
public override string ToString()
{

15
src/UglyToad.PdfPig.Fonts/CompactFontFormat/CompactFontFormatFont.cs
View File

@@ -48,10 +48,17 @@
var defaultWidthX = GetDefaultWidthX(characterName);
var nominalWidthX = GetNominalWidthX(characterName);
var result = CharStrings.Match(x => throw new NotImplementedException("Type 1 CharStrings in a CFF font are currently unsupported."),
x =>
if (CharStrings.TryGetFirst(out var _))
{
var glyph = x.Generate(characterName, (double)defaultWidthX, (double)nominalWidthX);
throw new NotImplementedException("Type 1 CharStrings in a CFF font are currently unsupported.");
}
if (!CharStrings.TryGetSecond(out var type2CharStrings))
{
return null;
}
var glyph = type2CharStrings.Generate(characterName, (double)defaultWidthX, (double)nominalWidthX);
var rectangle = glyph.Path.GetBoundingRectangle();
if (rectangle.HasValue)
{
@@ -60,9 +67,7 @@
var defaultBoundingBox = TopDictionary.FontBoundingBox;
return new PdfRectangle(0, 0, glyph.Width.GetValueOrDefault(), defaultBoundingBox.Height);
});
return result;
}
/// <summary>

15
src/UglyToad.PdfPig.Fonts/CompactFontFormat/CompactFontFormatFontCollection.cs
View File

@@ -2,7 +2,6 @@
{
using System;
using System.Collections.Generic;
using System.Linq;
using Core;
/// <summary>
@@ -21,6 +20,11 @@
/// </summary>
public IReadOnlyDictionary<string, CompactFontFormatFont> Fonts { get; }
/// <summary>
/// The first font contained in the collection.
/// </summary>
public CompactFontFormatFont FirstFont { get; }
/// <summary>
/// Create a new <see cref="CompactFontFormatFontCollection"/>.
/// </summary>
@@ -30,6 +34,11 @@
{
Header = header;
Fonts = fontSet ?? throw new ArgumentNullException(nameof(fontSet));
foreach (var pair in fontSet)
{
FirstFont = pair.Value;
break;
}
}
/// <summary>
@@ -50,7 +59,7 @@
/// </summary>
public PdfRectangle? GetCharacterBoundingBox(string characterName)
{
return Fonts.First().Value.GetCharacterBoundingBox(characterName);
return FirstFont.GetCharacterBoundingBox(characterName);
}
/// <summary>
@@ -58,7 +67,7 @@
/// </summary>
public string GetCharacterName(int characterCode)
{
var font = Fonts.First().Value;
var font = FirstFont;
if (font.Encoding != null)
{

10
src/UglyToad.PdfPig.Fonts/Type1/CharStrings/Commands/Arithmetic/CallSubrCommand.cs
View File

@@ -23,8 +23,14 @@
foreach (var command in subroutine.Commands)
{
command.Match(x => context.Stack.Push(x),
x => x.Run(context));
if (command.TryGetFirst(out var num))
{
context.Stack.Push(num);
}
else if (command.TryGetSecond(out var lazyCommand))
{
lazyCommand.Run(context);
}
}
}
}

10
src/UglyToad.PdfPig.Fonts/Type1/CharStrings/Type1CharStrings.cs
View File

@@ -92,8 +92,14 @@
foreach (var command in sequence.Commands)
{
command.Match(x => context.Stack.Push(x),
x => x.Run(context));
if (command.TryGetFirst(out var num))
{
context.Stack.Push(num);
}
else if (command.TryGetSecond(out var lazyCommand))
{
lazyCommand.Run(context);
}
}
return context.Path;

12
src/UglyToad.PdfPig/Content/PageContent.cs
View File

@@ -54,10 +54,14 @@
{
foreach (var image in images)
{
var result = image.Match<IPdfImage>(x => XObjectFactory.ReadImage(x, pdfScanner, filterProvider, resourceStore),
x => x);
yield return result;
if (image.TryGetFirst(out var xObjectContentRecord))
{
yield return XObjectFactory.ReadImage(xObjectContentRecord, pdfScanner, filterProvider, resourceStore);
}
else if (image.TryGetSecond(out var inlineImage))
{
yield return inlineImage;
}
}
}

2
src/UglyToad.PdfPig/PdfFonts/CidFonts/PdfCidCompactFontFormatFont.cs
View File

@@ -71,7 +71,7 @@
throw new NotSupportedException("Multiple fonts in a CFF");
}
#endif
return fontCollection.Fonts.First().Value;
return fontCollection.FirstFont;
}
}
}

23
src/UglyToad.PdfPig/PdfFonts/Parser/Handlers/Type1FontHandler.cs
View File

@@ -1,6 +1,5 @@
namespace UglyToad.PdfPig.PdfFonts.Parser.Handlers
{
using System.Linq;
using Cmap;
using Core;
using Filters;
@@ -101,21 +100,25 @@
}
}
Encoding fromFont = font?.Match(x => x.Encoding != null ? new BuiltInEncoding(x.Encoding) : default(Encoding), x =>
var fromFont = default(Encoding);
if (font != null)
{
if (x.Fonts != null && x.Fonts.Count > 0)
if (font.TryGetFirst(out var t1Font))
{
return x.Fonts.First().Value.Encoding;
fromFont = t1Font.Encoding != null ? new BuiltInEncoding(t1Font.Encoding) : default(Encoding);
}
else if (font.TryGetSecond(out var cffFont))
{
fromFont = cffFont.FirstFont?.Encoding;
}
}
return default(Encoding);
});
var encoding = encodingReader.Read(dictionary, descriptor, fromFont);
Encoding encoding = encodingReader.Read(dictionary, descriptor, fromFont);
if (encoding == null)
if (encoding == null && font != null && font.TryGetFirst(out var t1FontReplacment))
{
font?.Match(x => encoding = new BuiltInEncoding(x.Encoding), _ => { });
encoding = new BuiltInEncoding(t1FontReplacment.Encoding);
}
return new Type1FontSimple(name, firstCharacter, lastCharacter, widths, descriptor, encoding, toUnicodeCMap, font);

45
src/UglyToad.PdfPig/PdfFonts/Simple/Type1FontSimple.cs
View File

@@ -1,7 +1,6 @@
namespace UglyToad.PdfPig.PdfFonts.Simple
{
using System.Collections.Generic;
using System.Linq;
using Cmap;
using Composite;
using Core;
@@ -17,6 +16,8 @@
/// </summary>
internal class Type1FontSimple : IFont
{
private static readonly TransformationMatrix DefaultTransformationMatrix = TransformationMatrix.FromValues(0.001, 0, 0, 0.001, 0, 0);
private readonly Dictionary<int, CharacterBoundingBox> cachedBoundingBoxes = new Dictionary<int, CharacterBoundingBox>();
private readonly int firstChar;
@@ -52,8 +53,19 @@
this.fontProgram = fontProgram;
this.toUnicodeCMap = new ToUnicodeCMap(toUnicodeCMap);
var matrix = TransformationMatrix.FromValues(0.001, 0, 0, 0.001, 0, 0);
fontProgram?.Match(x => matrix = x.FontMatrix, x => { matrix = x.GetFirstTransformationMatrix(); });
var matrix = DefaultTransformationMatrix;
if (fontProgram != null)
{
if (fontProgram.TryGetFirst(out var t1Font))
{
matrix = t1Font.FontMatrix;
}
else if (fontProgram.TryGetSecond(out var cffFont))
{
matrix = cffFont.GetFirstTransformationMatrix();
}
}
fontMatrix = matrix;
@@ -90,10 +102,11 @@
}
var containsEncoding = false;
var capturedValue = default(string);
fontProgram.Match(x => { containsEncoding = x.Encoding.TryGetValue(characterCode, out capturedValue); },
_ => {});
value = capturedValue;
if (fontProgram.TryGetFirst(out var t1Font))
{
containsEncoding = t1Font.Encoding.TryGetValue(characterCode, out value);
}
return containsEncoding;
}
}
@@ -163,14 +176,15 @@
return new PdfRectangle(0, 0, widths[characterCode - firstChar], 0);
}
var rect = fontProgram.Match(x =>
PdfRectangle? rect = null;
if (fontProgram.TryGetFirst(out var t1Font))
{
var name = encoding.GetName(characterCode);
return x.GetCharacterBoundingBox(name);
},
x =>
rect = t1Font.GetCharacterBoundingBox(name);
}
else if (fontProgram.TryGetSecond(out var cffFont))
{
var first = x.Fonts.First().Value;
var first = cffFont.FirstFont;
string characterName;
if (encoding != null)
{
@@ -178,11 +192,12 @@
}
else
{
characterName = x.GetCharacterName(characterCode);
characterName = cffFont.GetCharacterName(characterCode);
}
rect = first.GetCharacterBoundingBox(characterName);
}
return first.GetCharacterBoundingBox(characterName);
});
if (!rect.HasValue)
{