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text: render SVG font as black-white outline

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Previously, using SVG fonts will cause Gio to render invisible
"characters".

Now, some fonts (like Noto Sans Emoji) will be rendered
based on "Outline". Gio don't support SVG fonts, but now
it will show the outline ("black-and-white") alternative.

Signed-off-by: Lucas Rodrigues <inkeliz@inkeliz.com>
This commit is contained in:
Lucas Rodrigues
2026-03-09 23:54:00 +00:00
committed by Chris Waldon
parent c3a6e85f5c
commit 65d86895b8
1 changed files with 51 additions and 44 deletions
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text/gotext.go
+51 -44
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@@ -656,53 +656,60 @@ func (s *shaperImpl) Shape(pathOps *op.Ops, gs []Glyph) clip.PathSpec {
}
scaleFactor := fixedToFloat(ppem) / float32(face.Upem())
glyphData := face.GlyphData(gid)
var outline font.GlyphOutline
switch glyphData := glyphData.(type) {
case font.GlyphOutline:
outline := glyphData
// Move to glyph position.
pos := f32.Point{
X: fixedToFloat((g.X - x) + g.Offset.X),
Y: -fixedToFloat(g.Offset.Y),
}
builder.Move(pos.Sub(lastPos))
lastPos = pos
var lastArg f32.Point
// Convert fonts.Segments to relative segments.
for _, fseg := range outline.Segments {
nargs := 1
switch fseg.Op {
case gotextot.SegmentOpQuadTo:
nargs = 2
case gotextot.SegmentOpCubeTo:
nargs = 3
}
var args [3]f32.Point
for i := range nargs {
a := f32.Point{
X: fseg.Args[i].X * scaleFactor,
Y: -fseg.Args[i].Y * scaleFactor,
}
args[i] = a.Sub(lastArg)
if i == nargs-1 {
lastArg = a
}
}
switch fseg.Op {
case gotextot.SegmentOpMoveTo:
builder.Move(args[0])
case gotextot.SegmentOpLineTo:
builder.Line(args[0])
case gotextot.SegmentOpQuadTo:
builder.Quad(args[0], args[1])
case gotextot.SegmentOpCubeTo:
builder.Cube(args[0], args[1], args[2])
default:
panic("unsupported segment op")
}
}
lastPos = lastPos.Add(lastArg)
outline = glyphData
case font.GlyphSVG:
outline = glyphData.Outline
default:
continue
}
// Move to glyph position.
pos := f32.Point{
X: fixedToFloat((g.X - x) - g.Offset.X),
Y: -fixedToFloat(g.Offset.Y),
}
builder.Move(pos.Sub(lastPos))
lastPos = pos
var lastArg f32.Point
// Convert fonts.Segments to relative segments.
for _, fseg := range outline.Segments {
nargs := 1
switch fseg.Op {
case gotextot.SegmentOpQuadTo:
nargs = 2
case gotextot.SegmentOpCubeTo:
nargs = 3
}
var args [3]f32.Point
for i := range nargs {
a := f32.Point{
X: fseg.Args[i].X * scaleFactor,
Y: -fseg.Args[i].Y * scaleFactor,
}
args[i] = a.Sub(lastArg)
if i == nargs-1 {
lastArg = a
}
}
switch fseg.Op {
case gotextot.SegmentOpMoveTo:
builder.Move(args[0])
case gotextot.SegmentOpLineTo:
builder.Line(args[0])
case gotextot.SegmentOpQuadTo:
builder.Quad(args[0], args[1])
case gotextot.SegmentOpCubeTo:
builder.Cube(args[0], args[1], args[2])
default:
panic("unsupported segment op")
}
}
lastPos = lastPos.Add(lastArg)
}
return builder.End()
}