lsm/PdfPig
1
0
Fork 0
mirror of https://github.com/UglyToad/PdfPig.git synced 2025-08-20 09:00:07 +08:00
Code Issues Actions 1 Packages Projects Releases Wiki Activity

#710 set colorspace based on jpeg info

Browse Source
This commit is contained in:
Eliot Jones 2024-01-13 16:21:36 +00:00
parent 83519b27b1
commit c061603ad2
3 changed files with 61 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
src/UglyToad.PdfPig/Images/JpegHandler.cs
View File

@ -29,7 +29,6 @@
switch (marker)
{
case JpegMarker.StartOfImage:
case JpegMarker.EndOfImage:
case JpegMarker.Restart0:
case JpegMarker.Restart1:
case JpegMarker.Restart2:
@ -49,8 +48,9 @@
var bpp = stream.ReadByte();
var height = ReadShort(stream, shortBuffer);
var width = ReadShort(stream, shortBuffer);
var numberOfComponents = stream.ReadByte();
return new JpegInformation(width, height, bpp);
return new JpegInformation(width, height, bpp, numberOfComponents);
}
case JpegMarker.ApplicationSpecific0:
case JpegMarker.ApplicationSpecific1:

8
src/UglyToad.PdfPig/Images/JpegInformation.cs
View File

@ -20,14 +20,20 @@
/// </summary>
public int BitsPerComponent { get; }
/// <summary>
/// 1 grayscale, 3 RGB, 4 CMYK.
/// </summary>
public int NumberOfComponents { get; }
/// <summary>
/// Create a new <see cref="JpegInformation"/>.
/// </summary>
public JpegInformation(int width, int height, int bitsPerComponent)
public JpegInformation(int width, int height, int bitsPerComponent, int numberOfComponents)
{
Width = width;
Height = height;
BitsPerComponent = bitsPerComponent;
NumberOfComponents = numberOfComponents;
}
}
}

37
src/UglyToad.PdfPig/Writer/PdfPageBuilder.cs
View File

@ -21,13 +21,13 @@
using Tokens;
using Graphics.Operations.PathPainting;
using Images.Png;
using UglyToad.PdfPig.Actions;
using Actions;
internal class NameConflictSolver
{
private string prefix;
private readonly string prefix;
private int key = 0;
private HashSet<string> xobjectNamesUsed = new HashSet<string>();
private readonly HashSet<string> xobjectNamesUsed = new HashSet<string>();
public NameConflictSolver(string prefix)
{
@ -53,11 +53,14 @@
var newPrefix = ExtractPrefix(orginalName);
var name = $"{newPrefix}{key}";
while (xobjectNamesUsed.Contains(name))
{
name = $"{newPrefix}{++key}";
}
xobjectNamesUsed.Add(name);
return name;
}
@ -67,12 +70,10 @@
{
return NewName(name);
}
else
{
xobjectNamesUsed.Add(name);
return name;
}
}
}
@ -587,7 +588,13 @@
var info = JpegHandler.GetInformation(fileStream);
if (placementRectangle.Equals(default(PdfRectangle)))
placementRectangle = new PdfRectangle(0, 0, info.Width, info.Height);
{
placementRectangle = new PdfRectangle(
0,
0,
info.Width,
info.Height);
}
byte[] data;
using (var memory = new MemoryStream())
@ -597,6 +604,20 @@
data = memory.ToArray();
}
NameToken colorSpace;
if (info.NumberOfComponents == 1)
{
colorSpace = NameToken.Devicegray;
}
else if (info.NumberOfComponents == 4)
{
colorSpace = NameToken.Devicecmyk;
}
else
{
colorSpace = NameToken.Devicergb;
}
var imgDictionary = new Dictionary<NameToken, IToken>
{
{NameToken.Type, NameToken.Xobject },
@ -604,7 +625,7 @@
{NameToken.Width, new NumericToken(info.Width) },
{NameToken.Height, new NumericToken(info.Height) },
{NameToken.BitsPerComponent, new NumericToken(info.BitsPerComponent)},
{NameToken.ColorSpace, NameToken.Devicergb},
{NameToken.ColorSpace, colorSpace},
{NameToken.Filter, NameToken.DctDecode},
{NameToken.Length, new NumericToken(data.Length)}
};