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 +1,55 @@
+//go:build !amd64 && !arm64
+
+package pdu
+
+// ycoCgToBGRANoSub converts count pixels from YCoCg planes to interleaved BGRA,
+// assuming no chroma subsampling and no alpha plane override.
+// pixels must have capacity >= count*4.
+func ycoCgToBGRANoSub(pixels, yPlane, coPlane, cgPlane []byte, count int, shift uint8) {
+	i := 0
+	for ; i+4 <= count; i += 4 {
+		off := i * 4
+
+		yVal := int16(yPlane[i])
+		coVal := int16(int8(byte(int16(coPlane[i]) << shift)))
+		cgVal := int16(int8(byte(int16(cgPlane[i]) << shift)))
+		pixels[off] = clampByte(yVal - coVal - cgVal)
+		pixels[off+1] = clampByte(yVal + cgVal)
+		pixels[off+2] = clampByte(yVal + coVal - cgVal)
+		pixels[off+3] = 0xFF
+
+		yVal = int16(yPlane[i+1])
+		coVal = int16(int8(byte(int16(coPlane[i+1]) << shift)))
+		cgVal = int16(int8(byte(int16(cgPlane[i+1]) << shift)))
+		pixels[off+4] = clampByte(yVal - coVal - cgVal)
+		pixels[off+5] = clampByte(yVal + cgVal)
+		pixels[off+6] = clampByte(yVal + coVal - cgVal)
+		pixels[off+7] = 0xFF
+
+		yVal = int16(yPlane[i+2])
+		coVal = int16(int8(byte(int16(coPlane[i+2]) << shift)))
+		cgVal = int16(int8(byte(int16(cgPlane[i+2]) << shift)))
+		pixels[off+8] = clampByte(yVal - coVal - cgVal)
+		pixels[off+9] = clampByte(yVal + cgVal)
+		pixels[off+10] = clampByte(yVal + coVal - cgVal)
+		pixels[off+11] = 0xFF
+
+		yVal = int16(yPlane[i+3])
+		coVal = int16(int8(byte(int16(coPlane[i+3]) << shift)))
+		cgVal = int16(int8(byte(int16(cgPlane[i+3]) << shift)))
+		pixels[off+12] = clampByte(yVal - coVal - cgVal)
+		pixels[off+13] = clampByte(yVal + cgVal)
+		pixels[off+14] = clampByte(yVal + coVal - cgVal)
+		pixels[off+15] = 0xFF
+	}
+	for ; 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
+	}
+}