add new tv scanlines graphics scaler from Gregory Montoir, use -g tv2x to try it

svn-id: r6462

1 files changed, 25 insertions, 0 deletions

diff --git a/common/scaler.cpp b/common/scaler.cpp
index c0a2e30ef4..c0e9f85719 100644
--- a/common/scaler.cpp
+++ b/common/scaler.cpp
@@ -810,3 +810,28 @@ void Normal3x(uint8 *srcPtr, uint32 srcPitch, uint8 *null, uint8 *dstPtr, uint32
 		dstPtr += dstPitch3;
 	}
 }
+
+void TV2x(uint8 *srcPtr, uint32 srcPitch, uint8 *null, uint8 *dstPtr, uint32 dstPitch, 
+            int width, int height)
+{
+	unsigned int nextlineSrc = srcPitch / sizeof(short);
+	short *p = (short *)srcPtr;
+
+	unsigned int nextlineDst = dstPitch / sizeof(short);
+	short *q = (short *)dstPtr;
+
+	while(height--) {
+		for (int i = 0, j = 0; i < width; ++i, j += 2) {
+			unsigned short p1 = *(p + i);
+			unsigned short p2 = *(p + i + nextlineSrc);
+			unsigned short pi = (unsigned short)((INTERPOLATE(p1, p2) & colorMask) >> 1);
+
+			*(q + j) = p1;
+			*(q + j + 1) = p1;
+			*(q + j + nextlineDst) = pi;
+			*(q + j + nextlineDst + 1) = pi;
+		}
+		p += nextlineSrc;
+		q += nextlineDst << 1;
+	}
+}