Sander Schobers
432281f08d
Refactored Icon related methods & added alpha support for icon/image generation.
86 lines
1.8 KiB
Go
86 lines
1.8 KiB
Go
package ui
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import (
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"image"
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"image/color"
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"opslag.de/schobers/geom"
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)
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type ImagePixelTestFn func(geom.PointF32) bool
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type ImageAlphaPixelTestFn func(geom.PointF32) uint8
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func createImage(ctx Context, image image.Image) Image {
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im, err := ctx.Renderer().CreateImage(image)
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if err != nil {
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return nil
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}
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return im
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}
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func CreateIcon(ctx Context, test ImagePixelTestFn) Image {
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icon := DrawIcon(test)
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return createImage(ctx, icon)
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}
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func CreateImage(ctx Context, size geom.Point, test ImagePixelTestFn) Image {
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image := DrawImage(size, test)
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return createImage(ctx, image)
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}
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func CreateImageAlpha(ctx Context, size geom.Point, test ImageAlphaPixelTestFn) Image {
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image := DrawImageAlpha(size, test)
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return createImage(ctx, image)
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}
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func DrawIcon(test ImagePixelTestFn) image.Image {
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size := IconSize()
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return DrawImage(size, test)
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}
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func DrawImage(size geom.Point, test ImagePixelTestFn) image.Image {
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r := image.Rect(0, 0, size.X, size.Y)
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icon := image.NewRGBA(r)
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for y := 0; y < size.Y; y++ {
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for x := 0; x < size.X; x++ {
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pt := geom.PtF32(float32(x), float32(y))
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if test(pt) {
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icon.Set(x, y, color.White)
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}
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}
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}
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return icon
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}
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func DrawImageAlpha(size geom.Point, test ImageAlphaPixelTestFn) image.Image {
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r := image.Rect(0, 0, size.X, size.Y)
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icon := image.NewAlpha(r)
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for y := 0; y < size.Y; y++ {
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for x := 0; x < size.X; x++ {
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pt := geom.PtF32(float32(x), float32(y))
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if a := test(pt); a > 0 {
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icon.Set(x, y, color.Alpha{A: a})
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}
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}
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}
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return icon
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}
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func GetOrCreateIcon(ctx Context, name string, testFactory func() ImagePixelTestFn) Image {
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im := ctx.Images().Image(name)
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if im != nil {
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return im
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}
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test := testFactory()
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im = CreateIcon(ctx, test)
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if im == nil {
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return nil
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}
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ctx.Images().AddImage(name, im)
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return im
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}
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func IconSize() geom.Point {
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return geom.Pt(448, 512)
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}
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