Configurable font edges ⚙

Adds top-edge and bottom-edge parameters to the font function. These define how
the box around a word is computed. The possible values are:
- ascender
- cap-height (default top edge)
- x-height
- baseline (default bottom edge)
- descender

The defaults are chosen so that it's easy to create good-looking designs with
vertical alignment. Since they are much tighter than what most other software
uses by default, the default leading had to be increased to 50% of the font size
and paragraph spacing to 100% of the font size.

The values cap-height and x-height fall back to ascender in case they are zero
because this value may occur in fonts that don't have glyphs with cap- or
x-height (like Twitter Color Emoji). Since cap-height is the default top edge,
doing no fallback would break things badly.

Removes softness in favor of a simple boolean for pages and a more finegread u8
for spacing. This is needed to make paragraph spacing consume line spacing
created by hard line breaks.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/export/pdf.rs b/src/export/pdf.rs
index f86f977c..43c58403 100644
--- a/src/export/pdf.rs
+++ b/src/export/pdf.rs
@@ -180,6 +180,7 @@ impl<'a> PdfExporter<'a> {
 
                 Element::Text(shaped) => {
                     let mut text = content.text();
+
                     // Check if we need to issue a font switching action.
                     if shaped.face != face || shaped.font_size != size {
                         face = shaped.face;