forked from joejulian/gio
Elias Naur
74407a50d5
With public ImageOp fields there was no way to mark an image.Image as modified. Replace them with NewImageOp that always make a copy, and use the opportunity to ensure the copy is ready to upload to a GPU texture. Signed-off-by: Elias Naur <mail@eliasnaur.com>
51 lines
1.1 KiB
Go
51 lines
1.1 KiB
Go
// SPDX-License-Identifier: Unlicense OR MIT
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package material
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import (
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"image"
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"gioui.org/f32"
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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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// Image is a widget that displays an image.
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type Image struct {
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// Src is the image to display.
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Src image.Image
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// Scale is the ratio of image pixels to
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// dps.
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Scale float32
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}
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func (t *Theme) Image(img image.Image) Image {
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return Image{
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Src: img,
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Scale: 160 / 72, // About 72 DPI.
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}
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}
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func (im Image) Layout(gtx *layout.Context) {
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size := im.Src.Bounds()
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wf, hf := float32(size.Dx()), float32(size.Dy())
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w, h := gtx.Px(unit.Dp(wf*im.Scale)), gtx.Px(unit.Dp(hf*im.Scale))
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cs := gtx.Constraints
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d := image.Point{X: cs.Width.Constrain(w), Y: cs.Height.Constrain(h)}
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aspect := float32(w) / float32(h)
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dw, dh := float32(d.X), float32(d.Y)
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dAspect := dw / dh
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if aspect < dAspect {
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d.X = int(dh*aspect + 0.5)
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} else {
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d.Y = int(dw/aspect + 0.5)
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}
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dr := f32.Rectangle{
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Max: f32.Point{X: float32(d.X), Y: float32(d.Y)},
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}
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paint.NewImageOp(im.Src).Add(gtx.Ops)
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paint.PaintOp{Rect: dr}.Add(gtx.Ops)
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gtx.Dimensions = layout.Dimensions{Size: d, Baseline: d.Y}
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}
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