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Fix offset to match Gio paintGlyph exactly: (x + first.X, y + first.Y) with no subtraction

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Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>
This commit is contained in:
Greg Pomerantz 2026-05-09 13:15:29 -04:00
parent eb9754fde0
commit ddd44baefd
1 changed files with 7 additions and 5 deletions
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12
internal/ui/render.go
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@ -259,17 +259,19 @@ func (r *Renderer) drawLineText(gtx layout.Context, shp *text.Shaper, x, y unit.
}
// drawLine draws a line of glyphs using shaper.Shape() and shaper.Bitmaps().
// Matches Gio's paintGlyph exactly: offset by (x + first.X, y + first.Y).
func (r *Renderer) drawLine(gtx layout.Context, shp *text.Shaper, line []text.Glyph, x, y unit.Dp, col color.NRGBA) {
if len(line) == 0 {
return
}
first := line[0]
// shaper.Shape(line) returns a path where glyph positions are relative to
// the first glyph (first.X == 0 in the returned path). So we offset by
// (x, y) and let the shaper handle the rest.
// first.Y is the baseline; we subtract it so the top of the text is at y.
offX := float32(gtx.Dp(x))
offY := float32(gtx.Dp(y)) - float32(first.Y)
// the first glyph. Offset by (x + first.X, y + first.Y) to place the line
// at the desired document position. Matches Gio's paintGlyph:
// lineOff = (glyph.X, glyph.Y) - viewport.Min
// op.Affine(f32.Affine2D{}.Offset(lineOff))
offX := float32(gtx.Dp(x)) + float32(first.X)/64.0
offY := float32(gtx.Dp(y)) + float32(first.Y)
t := op.Affine(f32.Affine2D{}.Offset(f32.Pt(offX, offY))).Push(gtx.Ops)
// Draw vector glyphs