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Signal Zlib encode failure and fall back to Raw

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This commit is contained in:
Viktor Liu
2026-05-22 12:06:52 +02:00
parent 0f03c612d1
commit 030c57150f
2 changed files with 18 additions and 9 deletions
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19
client/vnc/server/session_encode.go
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@@ -450,11 +450,18 @@ func (s *session) sendFullUpdate(img *image.RGBA) error {
rectBuf = encodeTightRect(img, pf, 0, 0, w, h, tight)
case useZlib && zlib != nil:
// encodeZlibRect bakes in its own FBU header; reuse it for the
// single-rect path when there is no cursor to prepend.
if cursorRect == nil {
return s.writeFramed(encodeZlibRect(img, pf, 0, 0, w, h, zlib))
// single-rect path when there is no cursor to prepend. Fall back
// to Raw if the compressor errors out.
if zb, ok := encodeZlibRect(img, pf, 0, 0, w, h, zlib); ok {
if cursorRect == nil {
return s.writeFramed(zb)
}
rectBuf = zb[4:]
} else if cursorRect == nil {
return s.writeFramed(encodeRawRect(img, pf, 0, 0, w, h))
} else {
rectBuf = encodeRawRect(img, pf, 0, 0, w, h)[4:]
}
rectBuf = encodeZlibRect(img, pf, 0, 0, w, h, zlib)[4:]
default:
if cursorRect == nil {
return s.writeFramed(encodeRawRect(img, pf, 0, 0, w, h))
@@ -558,7 +565,9 @@ func (s *session) encodeTile(img *image.RGBA, x, y, w, h int) []byte {
return encodeTightRect(img, pf, x, y, w, h, tight)
}
if useZlib && zlib != nil {
return encodeZlibRect(img, pf, x, y, w, h, zlib)[4:]
if zb, ok := encodeZlibRect(img, pf, x, y, w, h, zlib); ok {
return zb[4:]
}
}
return encodeRawRect(img, pf, x, y, w, h)[4:]
}