Fixed bug in Write1BitPixelData that wrote too many bits to the byte

ff-gerard · ff-gerard · commit b29cd27c1031 · 2023-06-07T15:55:23.000+02:00
diff --git a/src/ImageSharp/Formats/Bmp/BmpEncoderCore.cs b/src/ImageSharp/Formats/Bmp/BmpEncoderCore.cs
@@ -668,7 +668,7 @@ private void Write1BitPixelData<TPixel>(Configuration configuration, Stream stre
 
             if (quantizedPixelRow.Length % 8 != 0)
             {
-                int startIdx = quantizedPixelRow.Length - 7;
+                int startIdx = quantizedPixelRow.Length - (quantizedPixelRow.Length % 8);
                 endIdx = quantizedPixelRow.Length;
                 Write1BitPalette(stream, startIdx, endIdx, quantizedPixelRow);
             }

Original file line number	Diff line number	Diff line change
`@@ -668,7 +668,7 @@ private void Write1BitPixelData<TPixel>(Configuration configuration, Stream stre`
`668`	`668`
`669`	`669`	`if (quantizedPixelRow.Length % 8 != 0)`
`670`	`670`	`{`
`671`		`- int startIdx = quantizedPixelRow.Length - 7;`
	`671`	`+ int startIdx = quantizedPixelRow.Length - (quantizedPixelRow.Length % 8);`
`672`	`672`	`endIdx = quantizedPixelRow.Length;`
`673`	`673`	`Write1BitPalette(stream, startIdx, endIdx, quantizedPixelRow);`
`674`	`674`	`}`