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text,font/opentype: make text layout and shaping safe for concurrent use

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Implementations of text.Face are reused across multiple windows for efficiency.
Make the opentype implementation safe for concurrent use and document it.

Updates gio#104

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2020-07-04 17:51:45 +02:00
parent e2278b64c1
commit 7bbe0da0c7
2 changed files with 10 additions and 6 deletions
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font/opentype/opentype.go
+8 -5
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@@ -19,10 +19,10 @@ import (
"golang.org/x/image/math/fixed"
)
// Font implements text.Face.
// Font implements text.Face. It's methods are safe to use
// concurrently.
type Font struct {
font *sfnt.Font
buf sfnt.Buffer
}
// Collection is a collection of one or more fonts.
@@ -90,16 +90,19 @@ func (f *Font) Layout(ppem fixed.Int26_6, maxWidth int, txt io.Reader) ([]text.L
if err != nil {
return nil, err
}
return layoutText(&f.buf, ppem, maxWidth, &opentype{Font: f.font, Hinting: font.HintingFull}, glyphs)
var buf sfnt.Buffer
return layoutText(&buf, ppem, maxWidth, &opentype{Font: f.font, Hinting: font.HintingFull}, glyphs)
}
func (f *Font) Shape(ppem fixed.Int26_6, str []text.Glyph) op.CallOp {
return textPath(&f.buf, ppem, &opentype{Font: f.font, Hinting: font.HintingFull}, str)
var buf sfnt.Buffer
return textPath(&buf, ppem, &opentype{Font: f.font, Hinting: font.HintingFull}, str)
}
func (f *Font) Metrics(ppem fixed.Int26_6) font.Metrics {
o := &opentype{Font: f.font, Hinting: font.HintingFull}
return o.Metrics(&f.buf, ppem)
var buf sfnt.Buffer
return o.Metrics(&buf, ppem)
}
func layoutText(sbuf *sfnt.Buffer, ppem fixed.Int26_6, maxWidth int, f *opentype, glyphs []text.Glyph) ([]text.Line, error) {