forked from joejulian/gio
Egon Elbre
f114acdb02
iconvg seems to expect a linear premultiplied color. Fixes gio#132 Signed-off-by: Egon Elbre <egonelbre@gmail.com>
63 lines
1.4 KiB
Go
63 lines
1.4 KiB
Go
// SPDX-License-Identifier: Unlicense OR MIT
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package widget
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import (
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"image"
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"image/color"
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"image/draw"
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"golang.org/x/exp/shiny/iconvg"
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"gioui.org/internal/f32color"
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"gioui.org/layout"
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"gioui.org/op/paint"
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"gioui.org/unit"
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)
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type Icon struct {
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Color color.NRGBA
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src []byte
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// Cached values.
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op paint.ImageOp
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imgSize int
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imgColor color.NRGBA
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}
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// NewIcon returns a new Icon from IconVG data.
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func NewIcon(data []byte) (*Icon, error) {
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_, err := iconvg.DecodeMetadata(data)
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if err != nil {
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return nil, err
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}
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return &Icon{src: data, Color: color.NRGBA{A: 0xff}}, nil
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}
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func (ic *Icon) Layout(gtx layout.Context, sz unit.Value) layout.Dimensions {
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ico := ic.image(gtx.Px(sz))
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ico.Add(gtx.Ops)
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paint.PaintOp{}.Add(gtx.Ops)
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return layout.Dimensions{
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Size: ico.Size(),
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}
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}
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func (ic *Icon) image(sz int) paint.ImageOp {
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if sz == ic.imgSize && ic.Color == ic.imgColor {
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return ic.op
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}
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m, _ := iconvg.DecodeMetadata(ic.src)
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dx, dy := m.ViewBox.AspectRatio()
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img := image.NewRGBA(image.Rectangle{Max: image.Point{X: sz, Y: int(float32(sz) * dy / dx)}})
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var ico iconvg.Rasterizer
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ico.SetDstImage(img, img.Bounds(), draw.Src)
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m.Palette[0] = f32color.NRGBAToLinearRGBA(ic.Color)
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iconvg.Decode(&ico, ic.src, &iconvg.DecodeOptions{
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Palette: &m.Palette,
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})
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ic.op = paint.NewImageOp(img)
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ic.imgSize = sz
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ic.imgColor = ic.Color
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return ic.op
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}
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