pwm: Add gray8 -> colored gray6 conversion.

Author: freezy

LibDmd/Frame/DmdFrame.cs

@@ -387,6 +387,19 @@ public DmdFrame ConvertRgb565ToRgb24()
 			}
 		}
 
+		public ColoredFrame ConvertGray8ToColoredGray6(Color[] palette)
+		{
+			using (Profiler.Start("DmdFrame.ConvertGray8ToColoredGray")) {
+
+#if DEBUG
+				if (BitLength != 8) {
+					throw new ArgumentException("Cannot convert non-Gray8 frame to Colored Gray 6.");
+				}
+#endif
+				return new ColoredFrame(Dimensions, FrameUtil.ConvertGray8ToGray(Data, 6), palette);
+			}
+		}
+
 		public DmdFrame ConvertRgb24ToRgb565()
 		{
 			using (Profiler.Start("DmdFrame.ConvertRgb24ToRgb565")) {

LibDmd/RenderGraph.cs

@@ -124,9 +124,11 @@ public void AddDestination(IDestination dest)
 
 		private Color[] _gray2Colors; 
 		private Color[] _gray4Colors;
+		private Color[] _gray6Colors;
 		private Color[] _gray8Colors;
 		private Color[] _gray2Palette;
 		private Color[] _gray4Palette;
+		private Color[] _gray6Palette;
 		private Color[] _gray8Palette;
 
 		private IDisposable _idleRenderer;
@@ -197,6 +199,7 @@ public void SetColor(Color color)
 		{
 			_gray2Colors = ColorUtil.GetPalette(new []{Colors.Black, color}, 4);
 			_gray4Colors = ColorUtil.GetPalette(new []{Colors.Black, color}, 16);
+			_gray6Colors = ColorUtil.GetPalette(new []{Colors.Black, color}, 64);
 			_gray8Colors = ColorUtil.GetPalette(new []{Colors.Black, color}, 256);
 
 			Logger.Info($"[RenderGraph] SetColor(0%: {_gray2Colors[0]}, 33%:{_gray2Colors[1]}, 66%:{_gray2Colors[2]}, 100%:{_gray2Colors[3]})");
@@ -210,6 +213,7 @@ public void SetPalette(Color[] colors)
 		{
 			_gray2Palette = ColorUtil.GetPalette(colors, 4);
 			_gray4Palette = ColorUtil.GetPalette(colors, 16);
+			_gray6Palette = ColorUtil.GetPalette(colors, 64);
 			_gray8Palette = ColorUtil.GetPalette(colors, 256);
 		}
 
@@ -220,6 +224,7 @@ public void ClearPalette()
 		{
 			_gray2Palette = null;
 			_gray4Palette = null;
+			_gray6Palette = null;
 			_gray8Palette = null;
 		}
 
@@ -655,6 +660,11 @@ public IDisposable StartRendering(Action onCompleted, Action<Exception> onError
 						Connect(Source, dest, FrameFormat.Gray4, FrameFormat.Gray2);
 						continue;
 					}
+					// gray8 -> colored gray6
+					if (sourceGray8 != null && destColoredGray6 != null) {
+						Connect(Source, dest, FrameFormat.Gray8, FrameFormat.ColoredGray6);
+						continue;
+					}
 					// gray8 -> gray4
 					if (sourceGray8 != null && destGray4 != null) {
 						Connect(Source, dest, FrameFormat.Gray8, FrameFormat.Gray4);
@@ -1010,6 +1020,19 @@ private void Connect(ISource source, IDestination dest, FrameFormat from, FrameF
 								destGray8.RenderGray8);
 							break;
 
+						// gray8 -> colored gray6
+						case FrameFormat.ColoredGray6:
+							AssertCompatibility(source, sourceGray8, dest, destColoredGray6, from, to);
+							Subscribe(
+								sourceGray8.GetGray8Frames(!dest.NeedsDuplicateFrames),
+								frame => frame
+									.TransformHdScaling(destFixedSize, ScalerMode)
+									.ConvertGray8ToColoredGray6(_gray6Colors ?? _gray6Colors)
+									.Transform(this, destFixedSize, destMultiSize),
+								destColoredGray6.RenderColoredGray6
+							);
+							break;
+
 						// gray8 -> rgb565
 						case FrameFormat.Rgb565:
 							AssertCompatibility(source, sourceGray8, dest, destRgb565, from, to);