48 lines
1020 B
Go
48 lines
1020 B
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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const (
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doubleHiResWidth = 2 * hiResWidth
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)
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func snapshotDoubleHiResModeMono(a *Apple2, isSecondPage bool, mixedMode bool, light color.Color) *image.RGBA {
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// As described in "Inside the Apple IIe"
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height := hiResHeight
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if mixedMode {
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height = hiResHeightMixed
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}
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size := image.Rect(0, 0, doubleHiResWidth, height)
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img := image.NewRGBA(size)
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for y := 0; y < height; y++ {
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lineParts := [][]uint8{
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getHiResLine(a, y, isSecondPage, true),
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getHiResLine(a, y, isSecondPage, false),
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}
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x := 0
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// For the NTSC filter to work we have to insert an initial black pixel and skip the last one
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img.Set(x, y, color.Black)
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x++
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for iByte := 0; iByte < hiResLineBytes; iByte++ {
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for iPart := 0; iPart < 2; iPart++ {
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b := lineParts[iPart][iByte]
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for j := uint(0); j < 7; j++ {
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bit := (b >> j) & 1
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colour := light
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if bit == 0 {
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colour = color.Black
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}
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img.Set(x, y, colour)
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x++
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}
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}
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}
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}
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return img
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}
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