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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>
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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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text/text.go
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@@ -45,7 +45,8 @@ type Font struct {
Weight Weight
}
// Face implements text layout and shaping for a particular font.
// Face implements text layout and shaping for a particular font. All
// methods must be safe for concurrent use.
type Face interface {
Layout(ppem fixed.Int26_6, maxWidth int, txt io.Reader) ([]Line, error)
Shape(ppem fixed.Int26_6, str []Glyph) op.CallOp