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https://git.sr.ht/~eliasnaur/gio
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Elias Naur
1d3360699e
Text shaping is a common name for what package measure does. Rename it to "shape" and move it below the text package. Signed-off-by: Elias Naur <mail@eliasnaur.com>
64 lines
1.3 KiB
Go
64 lines
1.3 KiB
Go
// SPDX-License-Identifier: Unlicense OR MIT
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package shape
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import (
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"golang.org/x/image/font"
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"golang.org/x/image/font/sfnt"
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"golang.org/x/image/math/fixed"
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)
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type opentype struct {
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Font *sfnt.Font
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Hinting font.Hinting
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buf sfnt.Buffer
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}
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func (f *opentype) GlyphAdvance(ppem fixed.Int26_6, r rune) (advance fixed.Int26_6, ok bool) {
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g, err := f.Font.GlyphIndex(&f.buf, r)
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if err != nil {
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return 0, false
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}
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adv, err := f.Font.GlyphAdvance(&f.buf, g, ppem, f.Hinting)
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return adv, err == nil
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}
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func (f *opentype) Kern(ppem fixed.Int26_6, r0, r1 rune) fixed.Int26_6 {
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g0, err := f.Font.GlyphIndex(&f.buf, r0)
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if err != nil {
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return 0
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}
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g1, err := f.Font.GlyphIndex(&f.buf, r1)
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if err != nil {
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return 0
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}
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adv, err := f.Font.Kern(&f.buf, g0, g1, ppem, f.Hinting)
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if err != nil {
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return 0
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}
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return adv
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}
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func (f *opentype) Metrics(ppem fixed.Int26_6) font.Metrics {
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m, _ := f.Font.Metrics(&f.buf, ppem, f.Hinting)
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return m
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}
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func (f *opentype) Bounds(ppem fixed.Int26_6) fixed.Rectangle26_6 {
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r, _ := f.Font.Bounds(&f.buf, ppem, f.Hinting)
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return r
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}
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func (f *opentype) LoadGlyph(ppem fixed.Int26_6, r rune) ([]sfnt.Segment, bool) {
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g, err := f.Font.GlyphIndex(&f.buf, r)
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if err != nil {
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return nil, false
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}
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segs, err := f.Font.LoadGlyph(&f.buf, g, ppem, nil)
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if err != nil {
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return nil, false
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}
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return segs, true
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}
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