/
s4548.go
136 lines (117 loc) · 2.89 KB
/
s4548.go
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package s4548
import (
"image"
"image/color"
"os"
"syscall"
"unsafe"
"fmt"
)
var pBITMASKS = []byte{ 0x80, 0x40, 0x20, 0x10, 0x8, 0x4, 0x2, 0x1 }
const default_screen = "/dev/s4548-0"
const WIDTH = 101
const HEIGHT = 40
type S4548 struct {
*image.Paletted
damage image.Rectangle
fb []uint8
fp *os.File
path string
}
func (s *S4548) Scanout() {
s.damage = image.Rect(0, 0, WIDTH, HEIGHT)
s.Repair()
}
func (s *S4548) Repair() {
r := s.Bounds().Intersect(s.damage)
//image.Rect(0, 0, WIDTH, HEIGHT)
fmt.Println("Screen Damage:", r)
for y := r.Min.Y; y < r.Max.Y; y++ {
row_offset := ((y / 8) * s.Bounds().Max.X)
for x := r.Min.X; x < r.Max.X; x++ {
if s.ColorIndexAt(x, y) > 0 {
s.fb[row_offset + x] |= pBITMASKS[y % 8]
} else {
s.fb[row_offset + x] &= ^pBITMASKS[y % 8]
}
}
}
s.damage = image.ZR
msync(s.fb, syscall.MS_ASYNC)
/*
n, err := s.fp.WriteAt(s.fb, 0)
if (err != nil) || (n != len(s.fb)) {
panic(err)
}
*/
}
func (s *S4548) GetPath() string {
return s.path
}
func NewS4548(path string) *S4548 {
screen := new(S4548)
screen.path = path
var err error
screen.fp = new(os.File)
screen.fp, err = os.OpenFile(path, os.O_RDWR, os.ModeDevice | os.ModeCharDevice)
if err != nil {
panic(err)
}
//screen.fb = make([]uint8, WIDTH*(HEIGHT / 8))
screen.fb, err = syscall.Mmap(int(screen.fp.Fd()), 0, WIDTH*(HEIGHT / 8),
syscall.PROT_READ | syscall.PROT_WRITE, syscall.MAP_SHARED);
if (err != nil) {
panic(err)
}
p := color.Palette{color.White, color.Black}
r := image.Rect(0, 0, WIDTH, HEIGHT)
screen.Paletted = image.NewPaletted(r, p)
return screen
}
func GetS4548EnvPath() string {
env := os.Getenv("S4548");
if (env != "") {
return env;
} else {
return default_screen;
}
}
func (s *S4548) Close() error {
return s.fp.Close()
}
func (s *S4548) Width() int {
return WIDTH
}
func (s *S4548) Height() int {
return HEIGHT
}
func (s *S4548) Damage(r image.Rectangle) {
if (r != image.ZR) {
if (s.damage == image.ZR) {
s.damage = r
} else {
s.damage = s.damage.Union(r)
}
}
}
/*
func (s *S4548) Draw(dst draw.Image, r image.Rectangle, src image.Image,
sp image.Point, op draw.Op) {
s.damage = s.damage.Union(r)
draw.Draw(s.Paletted, r, src, sp, op)
}
*/
func msync(b []byte, flag int) (err error) {
var _p0 unsafe.Pointer
if len(b) > 0 {
_p0 = unsafe.Pointer(&b[0])
} else {
_p0 = unsafe.Pointer(&b[0])
}
_, _, e1 := syscall.Syscall(syscall.SYS_MSYNC,
uintptr(_p0), uintptr(len(b)), uintptr(flag))
if e1 != 0 {
err = e1
}
return
}