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iPF progressive mode decoder

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minjaesong
2025-12-19 21:41:51 +09:00
parent 1680137b7d
commit 96d697e158
4 changed files with 206 additions and 6 deletions
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16
assets/disk0/tvdos/TVDOS.SYS
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@@ -870,11 +870,21 @@ Object.freeze(_TVDOS.DRV.FS.DEVPT)
_TVDOS.DRV.FS.DEVFBIPF = {}
_TVDOS.DRV.FS.DEVFBIPF.pwrite = (fd, infilePtr, count, _2) => {
let decodefun = ([graphics.decodeIpf1, graphics.decodeIpf2])[sys.peek(infilePtr + 13)]
let flags = sys.peek(infilePtr+12)
let ipfType = sys.peek(infilePtr+13)
let isProgressive = (flags & 0x80) != 0
let hasAlpha = (flags & 0x01) != 0
// Select decode function based on type and progressive flag
let decodefun
if (isProgressive) {
decodefun = ([graphics.decodeIpf1Progressive, graphics.decodeIpf2Progressive])[ipfType]
} else {
decodefun = ([graphics.decodeIpf1, graphics.decodeIpf2])[ipfType]
}
let width = sys.peek(infilePtr+8) | (sys.peek(infilePtr+9) << 8)
let height = sys.peek(infilePtr+10) | (sys.peek(infilePtr+11) << 8)
let hasAlpha = (sys.peek(infilePtr+12) != 0)
let ipfType = sys.peek(infilePtr+13)
let imgLen = sys.peek(infilePtr+24) | (sys.peek(infilePtr+25) << 8) | (sys.peek(infilePtr+26) << 16) | (sys.peek(infilePtr+27) << 24)
let ipfbuf = sys.malloc(imgLen)