convert pdf text to svg using mupdf

Question

I’m new for pdf and mupdf. some code in svg-device.c here:

static void
svg_dev_text_span(fz_context *ctx, svg_device *sdev, fz_matrix ctm, const fz_text_span *span)
{
    ...
    fz_matrix tm, inv_tm, final_tm;
    ...

    tm = span->trm;
    font_size = fz_matrix_expansion(tm);
    final_tm.a = tm.a / font_size;
    final_tm.b = tm.b / font_size;
    final_tm.c = -tm.c / font_size;
    final_tm.d = -tm.d / font_size;
    final_tm.e = 0;
    final_tm.f = 0;
    inv_tm = fz_invert_matrix(final_tm);
    final_tm = fz_concat(final_tm, ctm);

    tm.e = span->items[0].x;
    tm.f = span->items[0].y;

    ...
    fz_write_printf(ctx, out, " transform="matrix(%M)"", &final_tm);

Why use final_tm as the final transform?

question from:https://stackoverflow.com/questions/65881096/convert-pdf-text-to-svg-using-mupdf

Answer 1

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