55 lines
1.6 KiB
Go
55 lines
1.6 KiB
Go
package render
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import (
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"bytes"
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"image"
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"image/draw"
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"io"
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"github.com/go-text/typesetting/opentype/api"
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"github.com/go-text/typesetting/shaping"
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"github.com/srwiley/oksvg"
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"github.com/srwiley/rasterx"
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)
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func (r *Renderer) drawSVG(g shaping.Glyph, svg api.GlyphSVG, img draw.Image, x, y float32) error {
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pixWidth := int(fixed266ToFloat(g.Width) * r.PixScale)
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pixHeight := int(fixed266ToFloat(-g.Height) * r.PixScale)
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pix, err := renderSVGStream(bytes.NewReader(svg.Source), pixWidth, pixHeight)
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if err != nil {
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return err
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}
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rect := image.Rect(int(fixed266ToFloat(g.XBearing)*r.PixScale), int(fixed266ToFloat(-g.YBearing)*r.PixScale),
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pixWidth, pixHeight)
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draw.Draw(img, rect.Add(image.Point{X: int(x), Y: int(y)}), pix, image.Point{}, draw.Over)
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// ignore the svg.Outline shapes, as they are a fallback which we won't use
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return nil
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}
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func renderSVGStream(stream io.Reader, width, height int) (*image.NRGBA, error) {
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icon, err := oksvg.ReadIconStream(stream)
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if err != nil {
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return nil, err
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}
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iconAspect := float32(icon.ViewBox.W / icon.ViewBox.H)
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viewAspect := float32(width) / float32(height)
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imgW, imgH := width, height
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if viewAspect > iconAspect {
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imgW = int(float32(height) * iconAspect)
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} else if viewAspect < iconAspect {
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imgH = int(float32(width) / iconAspect)
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}
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icon.SetTarget(icon.ViewBox.X, icon.ViewBox.Y, float64(imgW), float64(imgH))
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out := image.NewNRGBA(image.Rect(0, 0, imgW, imgH))
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scanner := rasterx.NewScannerGV(int(icon.ViewBox.W), int(icon.ViewBox.H), out, out.Bounds())
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raster := rasterx.NewDasher(width, height, scanner)
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icon.Draw(raster, 1)
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return out, nil
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}
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