Merge pull request #5 from WinampDesktop/community

Merge to main

1 files changed, 86 insertions, 0 deletions

diff --git a/Src/Plugins/Visualization/vis_nsfs/linedraw.cpp b/Src/Plugins/Visualization/vis_nsfs/linedraw.cpp
new file mode 100644
index 00000000..a240cf65
--- /dev/null
+++ b/Src/Plugins/Visualization/vis_nsfs/linedraw.cpp
@@ -0,0 +1,86 @@
+#include <windows.h>
+
+static void __inline DrawPixel(int color, unsigned char *fb)
+{
+  int a=*fb;
+  a+=color;
+  if (a>255)a=255;
+  *fb=(unsigned char)a;
+}
+
+// based on abrash's wu antialiasing routine
+void line(unsigned char *fb, int X0, int Y0, int X1, int Y1, int w, int h)
+{
+	unsigned int ErrorAdj=0, ErrorAcc;
+	int DeltaX, DeltaY, XDir=1;
+
+	if (Y0 > Y1) 
+	{
+		int t = Y0; Y0 = Y1; Y1 = t;
+		t = X0; X0 = X1; X1 = t;
+	}
+
+	DeltaY = Y1 - Y0;
+	DeltaX = X1 - X0;
+	if (DeltaX < 0) 
+	{
+		XDir = -1;
+		DeltaX = -DeltaX;
+	}
+
+	if (DeltaY > DeltaX) {
+
+		ErrorAcc = (X0&0xffff);
+		Y0>>=16;
+		X0>>=16;
+		DeltaY += 65535;   
+		DeltaY >>= 16;
+		if (DeltaY) ErrorAdj = DeltaX/DeltaY;
+		fb+=Y0*w+X0;
+		while (DeltaY-- >= 0) {
+			if (X0 > 0 && Y0 >= 0 && X0 < w-1 && Y0 < h)
+			{
+				int Weighting = ErrorAcc >> 10;
+				DrawPixel(Weighting^63,fb);
+				DrawPixel(Weighting,fb+XDir);
+			}
+	        
+			ErrorAcc += ErrorAdj;
+			if (ErrorAcc >= 65536) {
+				X0 += XDir;
+				fb += XDir;
+				ErrorAcc -= 65536;
+			}
+			fb+=w;
+			Y0++;
+		}
+	}
+	else
+	{
+		ErrorAcc = (Y0&0xffff);
+		X0>>=16;
+		Y0>>=16;
+		DeltaX += 65535;   
+		DeltaX >>= 16;
+		if (DeltaX) ErrorAdj = DeltaY/DeltaX;
+
+		fb+=Y0*w+X0;
+		while (DeltaX-- >= 0) {
+			if (Y0 >= 0 && Y0 < h-1 && X0 >= 0 && X0 < w)
+			{
+				int Weighting = ErrorAcc >> 10;
+				DrawPixel(Weighting^63,fb);
+				DrawPixel(Weighting,fb+w);
+			}
+
+			ErrorAcc += ErrorAdj;
+			if (ErrorAcc >= 65536) {
+				Y0++;
+				fb+=w;
+				ErrorAcc-=65536;
+			}
+			fb+=XDir;
+			X0+=XDir;
+		}
+	}
+}
\ No newline at end of file