[FOP-3135] [PATCH] SVG tspan content is displayed out of place

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: main
• Component/s: image/svg
• Assignee: Simon Steiner
• Reporter: Julien Lacour
• Created: 19/Jun/23 10:54
• Updated: 15/Jul/24 12:13
• Resolved: 15/Jul/24 12:13

Description

We have found an issue in FOP when transforming PDFs with SVGs containing <tspan> with multiple @x and/or @y attributes values.
The problem is located in org.apache.fop.svg.PDFTextPainter.writeGlyphs(FOPGVTGlyphVector, GeneralPath), the positions given by x and y are never used when set.
A possible fix for this issue is the following:

    for (int i = 0, n = gv.getNumGlyphs(); i < n; i++) {
        int     gc              = gv.getGlyphCode(i);
        int[]   pa              = ((i > dp.length) || (dp[i] == null)) ? paZero : dp[i];
        if (gv.getGlyphPosition(i) != null) {
            Point2D gp              = gv.getGlyphPosition(i);
            double x                = gp.getX() - initialPos.getX();
            double y                = -(gp.getY() - initialPos.getY());
            double xd               = x - xoLast;
            double yd               = y - yoLast;

            textUtil.writeTd(xd, yd);
            textUtil.writeTj((char) gc, true, false);
            xc = x + pa[2];
            yc = y + pa[3];
            xoLast = x;
            yoLast = y;
        } else {
            double  xo              = xc + pa[0];
            double  yo              = yc + pa[1];
            double  xa              = f.getWidth(gc);
            double  ya              = 0;
            double  xd              = (xo - xoLast) / 1000f;
            double  yd              = (yo - yoLast) / 1000f;
           
            textUtil.writeTd(xd, yd);
            textUtil.writeTj((char) gc, true, false);
            xc += xa + pa[2];
            yc += ya + pa[3];
            xoLast = xo;
            yoLast = yo;
        }
    }

I also attached an example for testing, it can be opened in Batik for comparison.

Issue Links

• is related to: FOP-3180 SVG Glyph positions ignored when using a custom font