Right to Left languages add a space at the beginning of a line

Not sure if I'm doing right to left correctly but when I render a multi line text, any line that isn't the end of the paragraph has an extra space at the beginning of the line. Here are a few examples:

In this example you can see the first 4 lines there is a slight space at the beginning but the last line is more right.

In this example the first line of the second paragraph has a slight space but the second line is flush with the other lines.

Here's the code I'm using to create the string:

public void DrawText(
    SKCanvas canvas,
    string text,
    SkiaTextLayoutOptions layoutOptions
)
{
    if (string.IsNullOrWhiteSpace(text))
    {
        return;
    }

    var richString = new RichString
    {
        MaxWidth = layoutOptions.MaxWidthPixels,
        MaxHeight = layoutOptions.MaxHeightPixels,
    };

    var margin = layoutOptions.MarginPixels;
    richString.MarginTop(margin).MarginBottom(margin).MarginLeft(margin).MarginRight(margin);

    richString.Add(text, layoutOptions.FontFamily, fontSize: DefaultFontSize);
    richString.Alignment(TextAlignment.Right);

    var options = new TextPaintOptions
    {
        Edging = SKFontEdging.Antialias,
    };

    var startingPoint = new SKPoint(layoutOptions.StartingX, layoutOptions.StartingY);
    richString.Paint(canvas, startingPoint, options);
}

Here's a super simple implementation that shows the problem:

const int docSize = 576;
const string outputPath = @"C:\Users\gbcha\Downloads\hebrew.png";
var richString = new RichString
{
	MaxWidth = docSize
};

richString.Add("אמא ואבא,\n\nהיה לנו כיף! עזרתם לנו נורא ואנחנו מודים לכם מקרב לבאני וולריו נהנו כלכך ממתנת הלילה במלון ואנחנו אסירי תודה. מחכים הבא!\nניתאי, עלמה, ולריו, וטליה");
richString.Alignment(TextAlignment.Right);

using var bitmap = new SKBitmap(docSize, docSize);
using var bitmapCanvas = new SKCanvas(bitmap);
bitmapCanvas.Clear(SKColors.White);
richString.Paint(bitmapCanvas, new SKPoint(0, 0));

using var image = SKImage.FromBitmap(bitmap);
using var data = image.Encode(SKEncodedImageFormat.Png, 100);

using var output = File.OpenWrite(outputPath);
data.SaveTo(output);

Output:

If I remove the end of the line to make it so it doesn't wrap it removes the extra space:

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Right to Left languages add a space at the beginning of a line #96

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Right to Left languages add a space at the beginning of a line #96

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gbreen12 commented on May 2, 2025

gbreen12 commented on May 2, 2025

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