110 lines
2.8 KiB
Go
110 lines
2.8 KiB
Go
package screen
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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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rgb160Width = 4 * 160
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)
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func snapshotDoubleHiRes(vs VideoSource, isSecondPage bool, getNTSCMask bool, light color.Color) (*image.RGBA, *image.Alpha) {
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dataMain := vs.GetVideoMemory(isSecondPage, false)
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dataAux := vs.GetVideoMemory(isSecondPage, true)
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return renderDoubleHiRes(dataMain, dataAux, getNTSCMask, light)
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}
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func renderDoubleHiRes(dataMain []uint8, dataAux []uint8, getNTSCMask bool, light color.Color) (*image.RGBA, *image.Alpha) {
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// As described in "Inside the Apple IIe"
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size := image.Rect(0, 0, doubleHiResWidth, hiResHeight)
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img := image.NewRGBA(size)
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// To support RGB-mode 14 we will have a mask to mark where we should not have the NTSC filter applied
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// See: https://apple2online.com/web_documents/Video-7%20Manual%20KB.pdf
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var ntscMask *image.Alpha
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if getNTSCMask {
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ntscMask = image.NewAlpha(size)
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}
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for y := 0; y < hiResHeight; y++ {
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offset := getHiResLineOffset(y)
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lineParts := [][]uint8{
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dataAux[offset : offset+hiResLineBytes],
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dataMain[offset : offset+hiResLineBytes],
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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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if getNTSCMask {
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ntscMask.Set(x, y, color.Opaque)
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}
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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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mask := color.Transparent // Apply the NTSC filter
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if getNTSCMask && b&0x80 == 0 {
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mask = color.Opaque // Do not apply the NTSC filter
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}
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for j := uint(0); j < 7; j++ {
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// Set color
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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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// Set mask if requested
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if getNTSCMask {
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ntscMask.Set(x, y, mask)
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}
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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, ntscMask
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}
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func snapshotDoubleHiRes160(vs VideoSource, isSecondPage bool, light color.Color) *image.RGBA {
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dataMain := vs.GetVideoMemory(isSecondPage, false)
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dataAux := vs.GetVideoMemory(isSecondPage, true)
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return renderDoubleHiRes160(dataMain, dataAux, light)
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}
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func renderDoubleHiRes160(dataMain []uint8, dataAux []uint8, light color.Color) *image.RGBA {
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size := image.Rect(0, 0, rgb160Width, hiResHeight)
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img := image.NewRGBA(size)
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for y := 0; y < hiResHeight; y++ {
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offset := getHiResLineOffset(y)
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lineParts := [][]uint8{
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dataAux[offset : offset+hiResLineBytes],
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dataMain[offset : offset+hiResLineBytes],
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}
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x := 0
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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 < 8; j++ {
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// Set color
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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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