Apple-2-Tools
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izapple2
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Support for inverse and flash in text mode

This commit is contained in:
Ivan Izaguirre 2019-05-01 17:59:46 +02:00
parent 9fcd499241
commit 90250cdf3e
1 changed files with 9 additions and 2 deletions
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11
apple2/screen.go
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@ -6,6 +6,7 @@ import (
"image/color" "image/color"
"image/png" "image/png"
"os" "os"
"time"
) )
// Snapshot the currently visible screen // Snapshot the currently visible screen
@ -101,12 +102,13 @@ func getTextChar(a *Apple2, col int, line int, page int) uint8 {
} }
func snapshotTextMode(a *Apple2, page int) *image.RGBA { func snapshotTextMode(a *Apple2, page int) *image.RGBA {
// TODO: Missing inverse and flash modes
// Color for typical Apple ][ period green phosphor monitors // Color for typical Apple ][ period green phosphor monitors
// See: https://superuser.com/questions/361297/what-colour-is-the-dark-green-on-old-fashioned-green-screen-computer-displays // See: https://superuser.com/questions/361297/what-colour-is-the-dark-green-on-old-fashioned-green-screen-computer-displays
p1GreenPhosphorColor := color.RGBA{65, 255, 0, 255} p1GreenPhosphorColor := color.RGBA{65, 255, 0, 255}
// Flash mode is 2Hz
isFlashedFrame := time.Now().Nanosecond() > (1 * 1000 * 1000 * 1000 / 2)
width := textColumns * charWidth width := textColumns * charWidth
height := textLines * charHeight height := textLines * charHeight
size := image.Rect(0, 0, width, height) size := image.Rect(0, 0, width, height)
@ -119,7 +121,12 @@ func snapshotTextMode(a *Apple2, page int) *image.RGBA {
rowInChar := y % charHeight rowInChar := y % charHeight
colInChar := x % charWidth colInChar := x % charWidth
char := getTextChar(a, col, line, page) char := getTextChar(a, col, line, page)
topBits := char >> 6
isInverse := topBits == 0
isFlash := topBits == 1
pixel := a.cg.getPixel(char, rowInChar, colInChar) pixel := a.cg.getPixel(char, rowInChar, colInChar)
pixel = pixel != (isInverse || (isFlash && isFlashedFrame))
var colour color.Color var colour color.Color
if pixel { if pixel {
colour = p1GreenPhosphorColor colour = p1GreenPhosphorColor