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Only apply RemoveStridePadding() when bytes per pixel is one and fix #1183 #1187

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Merged
BobLd merged 1 commit into from
Oct 15, 2025
Merged

Only apply RemoveStridePadding() when bytes per pixel is one and fix #1183 #1187

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1 change: 1 addition & 0 deletions .gitignore
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Original file line number Diff line number Diff line change
Expand Up @@ -249,3 +249,4 @@ _Pvt_Extensions

/docs/doxygen
/tools/UglyToad.PdfPig.ConsoleRunner/Properties/launchSettings.json
/src/UglyToad.PdfPig.Tests/Images/Files/Pdf/indexed-png-with-mask.png
Binary file removed src/UglyToad.PdfPig.Tests/Images/Files/Pdf/indexed-png-with-mask.png
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67 changes: 67 additions & 0 deletions src/UglyToad.PdfPig.Tests/Integration/GithubIssuesTests.cs
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Expand Up @@ -4,9 +4,76 @@
using DocumentLayoutAnalysis.PageSegmenter;
using DocumentLayoutAnalysis.WordExtractor;
using PdfPig.Core;
using SkiaSharp;

public class GithubIssuesTests
{
[Fact]
public void Issue1183()
{
var path = IntegrationHelpers.GetDocumentPath("test_a.pdf");

byte[] expected =
[
82, 85, 134, 255, 87, 90, 139, 255, 81, 84, 133, 255, 87, 89, 139, 255, 89, 91, 141, 255, 81, 83, 133,
255, 84, 86, 136, 255, 84, 86, 136, 255, 70, 59, 113, 255, 69, 62, 116, 255, 75, 73, 126, 255, 45, 48,
100, 255, 42, 48, 99, 255, 50, 55, 107, 255, 56, 59, 111, 255, 64, 66, 118, 255, 68, 63, 118, 255, 61,
56, 111, 255, 70, 64, 120, 255, 67, 62, 117, 255, 61, 56, 111, 255, 68, 63, 118, 255, 68, 62, 118, 255,
59, 54, 109, 255, 61, 60, 117, 255, 69, 65, 122, 255, 67, 59, 116, 255, 71, 62, 118, 255, 66, 60, 115,
255, 47, 49, 102, 255, 40, 51, 102, 255, 35, 51, 100, 255, 70, 58, 114, 255, 68, 56, 112, 255, 76, 65,
121, 255, 68, 58, 114, 255, 66, 58, 114, 255, 71, 64, 119, 255, 62, 56, 111, 255, 67, 62, 117, 255, 77,
61, 118, 255, 71, 56, 113, 255, 76, 63, 119, 255, 74, 63, 118, 255, 63, 55, 108, 255, 71, 64, 116, 255,
73, 68, 119, 255, 52, 49, 99, 255, 38, 51, 99, 255, 49, 62, 110, 255, 39, 51, 100, 255, 46, 55, 106,
255, 50, 55, 107, 255, 63, 62, 116, 255, 67, 60, 116, 255, 71, 60, 116, 255, 67, 58, 112, 255, 68, 61,
114, 255, 70, 67, 119, 255, 50, 50, 101, 255, 42, 47, 96, 255, 49, 59, 106, 255, 40, 54, 100, 255, 42,
57, 103, 255, 51, 51, 102, 255, 67, 60, 112, 255, 73, 62, 114, 255, 71, 65, 117, 255, 48, 53, 103, 255,
45, 55, 104, 255, 49, 55, 105, 255, 63, 63, 114, 255, 68, 59, 115, 255, 71, 59, 115, 255, 73, 59, 115,
255, 74, 61, 118, 255, 66, 58, 114, 255, 50, 51, 105, 255, 39, 51, 104, 255, 34, 52, 103, 255, 64, 60,
116, 255, 67, 64, 119, 255, 66, 66, 120, 255, 46, 49, 102, 255, 45, 51, 102, 255, 52, 61, 111, 255, 39,
51, 99, 255, 41, 54, 102, 255, 42, 54, 100, 255, 43, 53, 99, 255, 47, 55, 103, 255, 51, 56, 104, 255,
56, 57, 108, 255, 67, 65, 117, 255, 67, 63, 116, 255, 52, 47, 100, 255, 44, 55, 106, 255, 44, 56, 106,
255, 42, 54, 103, 255, 42, 54, 102, 255, 40, 52, 100, 255, 41, 52, 99, 255, 45, 57, 103, 255, 42, 53,
99, 255, 38, 54, 95, 255, 39, 55, 97, 255, 47, 64, 105, 255, 37, 53, 95, 255, 37, 53, 95, 255, 46, 63,
104, 255, 39, 55, 96, 255, 42, 58, 99, 255, 41, 55, 105, 255, 45, 55, 106, 255, 46, 51, 103, 255, 51,
51, 103, 255, 63, 61, 114, 255, 70, 68, 121, 255, 60, 60, 113, 255, 46, 48, 100, 255, 49, 51, 101, 255,
51, 52, 103, 255, 58, 58, 109, 255, 69, 66, 119, 255, 64, 60, 113, 255, 61, 55, 109, 255, 70, 62, 118,
255, 67, 58, 114, 255, 72, 59, 115, 255, 70, 58, 115, 255, 72, 62, 118, 255, 61, 55, 110, 255, 64, 62,
116, 255, 65, 65, 119, 255, 47, 50, 104, 255, 52, 56, 109, 255, 39, 53, 106, 255, 41, 54, 107, 255, 40,
50, 102, 255, 45, 51, 103, 255, 64, 66, 117, 255, 62, 61, 112, 255, 67, 63, 114, 255, 53, 47, 98, 255,
49, 54, 101, 255, 51, 56, 104, 255, 43, 48, 95, 255, 50, 55, 102, 255, 49, 54, 102, 255, 42, 47, 94,
255, 51, 56, 103, 255, 47, 52, 100, 255, 72, 62, 114, 255, 71, 62, 114, 255, 72, 67, 119, 255, 52, 52,
103, 255, 44, 48, 99, 255, 48, 57, 106, 255, 39, 52, 100, 255, 43, 58, 106, 255, 43, 51, 98, 255, 44,
52, 99, 255, 48, 57, 104, 255, 46, 55, 102, 255, 41, 50, 97, 255, 45, 55, 101, 255, 49, 59, 105, 255,
43, 53, 100, 255, 51, 57, 106, 255, 41, 49, 98, 255, 40, 52, 100, 255, 45, 60, 107, 255, 38, 53, 101,
255, 36, 48, 96, 255, 46, 54, 102, 255, 49, 55, 104, 255, 44, 55, 104, 255, 46, 56, 105, 255, 48, 58,
107, 255, 41, 49, 99, 255, 43, 50, 100, 255, 52, 59, 108, 255, 50, 55, 105, 255, 50, 55, 105, 255, 43,
54, 105, 255, 42, 51, 102, 255, 45, 53, 104, 255, 45, 49, 101, 255, 63, 63, 116, 255, 66, 63, 116, 255,
68, 63, 117, 255, 62, 55, 109, 255, 74, 60, 120, 255, 73, 59, 119, 255, 72, 58, 119, 255, 76, 62, 122,
255, 74, 60, 120, 255, 71, 57, 118, 255, 75, 61, 121, 255, 76, 62, 123, 255
];

using (var document = PdfDocument.Open(path, new ParsingOptions() { UseLenientParsing = true }))
{
var page = document.GetPage(16);
var images = page.GetImages().ToArray();

Assert.Single(images);

var image = images[0];

Assert.True(image.TryGetPng(out var bytes));

File.WriteAllBytes("test_a_16.png", bytes);

using (SKBitmap actual = SKBitmap.Decode(bytes, new SKImageInfo(431, 690, SKColorType.Bgra8888)))
{
var pixels = actual.GetPixelSpan();
Assert.Equal(1189560, pixels.Length);
Assert.Equal(expected, pixels.Slice(0, 4 * 200).ToArray());
}
}
}

[Fact]
public void Issue1156()
{
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11 changes: 10 additions & 1 deletion src/UglyToad.PdfPig/Images/ColorSpaceDetailsByteConverter.cs
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Expand Up @@ -39,7 +39,16 @@ public static Span<byte> Convert(ColorSpaceDetails details, Span<byte> decoded,
var strideWidth = decoded.Length / imageHeight / bytesPerPixel;
if (strideWidth != imageWidth)
{
decoded = RemoveStridePadding(decoded, strideWidth, imageWidth, imageHeight, bytesPerPixel);
if (bytesPerPixel > 1)
{
// Fixed thanks to / see discussion at https://github.com/UglyToad/PdfPig/issues/1183
// Unclear what should be done here, we assume we can just remove the trailing bytes
decoded = decoded.Slice(0, imageWidth * imageHeight * bytesPerPixel);
}
else
{
decoded = RemoveStridePadding(decoded, strideWidth, imageWidth, imageHeight, bytesPerPixel);
}
}

return details.Transform(decoded);
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