97 lines
2.7 KiB
Go
97 lines
2.7 KiB
Go
package apple2
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import (
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"image"
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"image/color"
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)
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func getNTSCColorMap() []color.Color {
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// RGB values from https://mrob.com/pub/xapple2/colors.html
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black := color.RGBA{0, 0, 0, 255} /*COLOR=0 */ /* 0 0 0*/
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dkBlue := color.RGBA{96, 78, 189, 255} /*COLOR=2 */ /* 0 60 25*/
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red := color.RGBA{227, 30, 96, 255} /*COLOR=1 */ /* 90 60 25*/
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brown := color.RGBA{96, 114, 3, 255} /*COLOR=8 */ /*180 60 25*/
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dkGreen := color.RGBA{0, 163, 96, 255} /*COLOR=4 */ /*270 60 25*/
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grey := color.RGBA{156, 156, 156, 255} /*COLOR=10*/ /* 0 0 50*/
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purple := color.RGBA{255, 68, 253, 255} /*HCOLOR=2*/ /* 45 100 50*/
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orange := color.RGBA{255, 106, 60, 255} /*HCOLOR=5*/ /*135 100 50*/
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green := color.RGBA{20, 245, 60, 255} /*HCOLOR=1*/ /*225 100 50*/
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blue := color.RGBA{20, 207, 253, 255} /*HCOLOR=6*/ /*315 100 50*/
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//purple := color.RGBA{255, 68, 253, 255} /*COLOR=3 */ /* 45 100 50*/
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//orange := color.RGBA{255, 106, 60, 255} /*COLOR=9 */ /*135 100 50*/
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//green := color.RGBA{20, 245, 60, 255} /*COLOR=12*/ /*225 100 50*/
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//blue := color.RGBA{20, 207, 253, 255} /*COLOR=6 */ /*315 100 50*/
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ltBlue := color.RGBA{208, 195, 255, 255} /*COLOR=7 */ /* 0 60 75*/
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pink := color.RGBA{255, 160, 208, 255} /*COLOR=11*/ /* 90 60 75*/
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yellow := color.RGBA{208, 221, 141, 255} /*COLOR=13*/ /*180 60 75*/
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aqua := color.RGBA{114, 255, 208, 255} /*COLOR=14*/ /*270 60 75*/
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white := color.RGBA{255, 255, 255, 255} /*COLOR=15*/ /* 0 0 100*/
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colorMap := []color.Color{
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/* 0000 */ black,
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/* 0001 */ brown,
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/* 0010 */ dkGreen,
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/* 0011 */ green,
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/* 0100 */ dkBlue,
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/* 0101 */ grey,
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/* 0110 */ blue,
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/* 0111 */ aqua,
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/* 1000 */ red,
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/* 1001 */ orange,
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/* 1010 */ grey,
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/* 1011 */ yellow,
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/* 1100 */ purple,
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/* 1101 */ pink,
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/* 1110 */ ltBlue,
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/* 1111 */ white,
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}
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return colorMap
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}
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func filterNTSCColor(blacker bool, in *image.RGBA) *image.RGBA {
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colorMap := getNTSCColorMap()
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b := in.Bounds()
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size := image.Rect(0, 0, b.Dx()+3, b.Dy())
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out := image.NewRGBA(size)
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for y := b.Min.Y; y < b.Max.Y; y++ {
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// We store the last four bits. We start with 0000
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v := 0
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for x := b.Min.X; x < b.Dx(); x++ {
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cIn := in.At(x, y)
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r, _, _, _ := cIn.RGBA()
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pos := 1 << (3 - uint(x%4))
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var cOut color.Color
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if r != 0 {
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v |= pos
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cOut = colorMap[v]
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} else {
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v &^= pos
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if blacker {
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// If there is no luminance, let's have black anyway
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cOut = colorMap[0]
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} else {
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cOut = colorMap[v]
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}
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}
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out.Set(x, y, cOut)
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}
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// We fade for the last three positions
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for x := b.Dx(); x < b.Max.X; x++ {
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v = (v << 1) & 0xF
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cOut := colorMap[v]
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out.Set(x, y, cOut)
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}
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}
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return out
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}
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