forked from gioui/gio
/
icon.go
72 lines (62 loc) · 1.64 KB
/
icon.go
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// SPDX-License-Identifier: Unlicense OR MIT
package widget
import (
"image"
"image/color"
"image/draw"
"gioui.org/layout"
"gioui.org/op/clip"
"gioui.org/op/paint"
"gioui.org/unit"
"github.com/MTGArenaChat/gio/internal/f32color"
"golang.org/x/exp/shiny/iconvg"
)
type Icon struct {
src []byte
// Cached values.
op paint.ImageOp
imgSize int
imgColor color.NRGBA
}
const defaultIconSize = unit.Dp(24)
// NewIcon returns a new Icon from IconVG data.
func NewIcon(data []byte) (*Icon, error) {
_, err := iconvg.DecodeMetadata(data)
if err != nil {
return nil, err
}
return &Icon{src: data}, nil
}
// Layout displays the icon with its size set to the X minimum constraint.
func (ic *Icon) Layout(gtx layout.Context, color color.NRGBA) layout.Dimensions {
sz := gtx.Constraints.Min.X
if sz == 0 {
sz = gtx.Dp(defaultIconSize)
}
size := gtx.Constraints.Constrain(image.Pt(sz, sz))
defer clip.Rect{Max: size}.Push(gtx.Ops).Pop()
ico := ic.image(size.X, color)
ico.Add(gtx.Ops)
paint.PaintOp{}.Add(gtx.Ops)
return layout.Dimensions{
Size: ico.Size(),
}
}
func (ic *Icon) image(sz int, color color.NRGBA) paint.ImageOp {
if sz == ic.imgSize && color == ic.imgColor {
return ic.op
}
m, _ := iconvg.DecodeMetadata(ic.src)
dx, dy := m.ViewBox.AspectRatio()
img := image.NewRGBA(image.Rectangle{Max: image.Point{X: sz, Y: int(float32(sz) * dy / dx)}})
var ico iconvg.Rasterizer
ico.SetDstImage(img, img.Bounds(), draw.Src)
m.Palette[0] = f32color.NRGBAToLinearRGBA(color)
iconvg.Decode(&ico, ic.src, &iconvg.DecodeOptions{
Palette: &m.Palette,
})
ic.op = paint.NewImageOp(img)
ic.imgSize = sz
ic.imgColor = color
return ic.op
}