init: 自 zomaintain/backend/rdplib 平移独立成库; module path 从上游 github.com/nakagami/grdp 改为 git.zeroonesoft.cn/golib/rdplib

2026-09-19 18:55:43 +08:00
commit 1096fbce9d
94 changed files with 36790 additions and 0 deletions
@@ -0,0 +1,34 @@
+//go:build amd64
+
+package pdu
+
+import "unsafe"
+
+// ycoCgToBGRANoSub converts Y, Co, Cg planes to BGRA using SSE2.
+// count = total pixel count. shift = colorLossLevel - 1.
+// Alpha is always 0xFF (caller handles non-0xFF alpha separately).
+func ycoCgToBGRANoSub(pixels []byte, yPlane, coPlane, cgPlane []byte, count int, shift uint8) {
+	count8 := count &^ 7
+	if count8 > 0 {
+		ycoCgToBGRASSE2(
+			unsafe.Pointer(&pixels[0]),
+			unsafe.Pointer(&yPlane[0]),
+			unsafe.Pointer(&coPlane[0]),
+			unsafe.Pointer(&cgPlane[0]),
+			count8, int(shift),
+		)
+	}
+	for i := count8; i < count; i++ {
+		yVal := int16(yPlane[i])
+		coVal := int16(int8(byte(int16(coPlane[i]) << shift)))
+		cgVal := int16(int8(byte(int16(cgPlane[i]) << shift)))
+		off := i * 4
+		pixels[off] = clampByte(yVal - coVal - cgVal)
+		pixels[off+1] = clampByte(yVal + cgVal)
+		pixels[off+2] = clampByte(yVal + coVal - cgVal)
+		pixels[off+3] = 0xFF
+	}
+}
+
+//go:noescape
+func ycoCgToBGRASSE2(pixels, yPlane, coPlane, cgPlane unsafe.Pointer, count, shift int)