Add a ColorMixer widget for selecting sat/lum.

OpenRA.Mods.RA/OpenRA.Mods.RA.csproj

@@ -432,6 +432,7 @@
     <Compile Include="ServerTraits\PlayerPinger.cs" />
     <Compile Include="Widgets\Logic\SpawnSelectorTooltipLogic.cs" />
     <Compile Include="Widgets\Logic\ClientTooltipLogic.cs" />
+    <Compile Include="Widgets\ColorMixerWidget.cs" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\OpenRA.FileFormats\OpenRA.FileFormats.csproj">

OpenRA.Mods.RA/Widgets/ColorMixerWidget.cs

@@ -0,0 +1,228 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2011 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation. For more information,
+ * see COPYING.
+ */
+#endregion
+
+using System;
+using System.Drawing;
+using System.Drawing.Imaging;
+using System.Linq;
+using System.Threading;
+using OpenRA.FileFormats;
+using OpenRA.Graphics;
+using OpenRA.Widgets;
+
+namespace OpenRA.Mods.RA.Widgets
+{
+	public class ColorMixerWidget : Widget
+	{
+		public float[] SRange = {0.2f, 1.0f};
+		public float[] VRange = {0.2f, 1.0f};
+		public event Action OnChange = () => {};
+
+		float H, S, V;
+		Bitmap frontBitmap, swapBitmap, backBitmap;
+		Sprite mixerSprite;
+		bool isMoving;
+
+		bool updateFront, updateBack;
+		object syncWorker = new object();
+		Thread workerThread;
+		bool workerAlive;
+
+		public ColorMixerWidget() : base() {}
+		public ColorMixerWidget(ColorMixerWidget other)
+			: base(other)
+		{
+			OnChange = other.OnChange;
+			H = other.H;
+			S = other.S;
+			V = other.V;
+		}
+
+		public override void Initialize(WidgetArgs args)
+		{
+			base.Initialize(args);
+
+			// Bitmap data is generated in a background thread and then flipped
+			frontBitmap = new Bitmap(256, 256);
+			swapBitmap = new Bitmap(256, 256);
+			backBitmap = new Bitmap(256, 256);
+
+			var rect = new Rectangle((int)(255*SRange[0]), (int)(255*(1 - VRange[1])), (int)(255*(SRange[1] - SRange[0]))+1, (int)(255*(VRange[1] - VRange[0])) + 1);
+			mixerSprite = new Sprite(new Sheet(new Size(256, 256)), rect, TextureChannel.Alpha);
+			mixerSprite.sheet.Texture.SetData(frontBitmap);
+		}
+
+		void GenerateBitmap()
+		{
+			// Generating the selection bitmap is slow,
+			// so we do it in a background thread
+			lock (syncWorker)
+			{
+				updateBack = true;
+
+				if (workerThread == null || !workerAlive)
+				{
+					workerThread = new Thread(GenerateBitmapWorker);
+					workerThread.Start();
+				}
+			}
+		}
+
+		void GenerateBitmapWorker()
+		{
+			lock (syncWorker)
+				workerAlive = true;
+
+			for (;;)
+			{
+				float hue;
+				lock (syncWorker)
+				{
+					if (!updateBack)
+					{
+						workerAlive = false;
+						break;
+					}
+					updateBack = false;
+
+					// Take a local copy of the hue to generate to avoid tearing
+					hue = H;
+				}
+
+				var bitmapData = backBitmap.LockBits(backBitmap.Bounds(),
+					ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);
+
+				unsafe
+				{
+					int* c = (int*)bitmapData.Scan0;
+
+					// Generate palette in HSV
+					for (var v = 0; v < 256; v++)
+						for (var s = 0; s < 256; s++)
+							*(c + (v * bitmapData.Stride >> 2) + s) = HSLColor.FromHSV(hue, s / 255f, (255 - v) / 255f).ToColor().ToArgb();
+				}
+
+				backBitmap.UnlockBits(bitmapData);
+				lock (syncWorker)
+				{
+					var swap = swapBitmap;
+					swapBitmap = backBitmap;
+					backBitmap = swap;
+					updateFront = true;
+				}
+			}
+		}
+
+		public override void Draw()
+		{
+			lock (syncWorker)
+			{
+				if (updateFront)
+				{
+					var swap = swapBitmap;
+					swapBitmap = frontBitmap;
+					frontBitmap = swap;
+
+					mixerSprite.sheet.Texture.SetData(frontBitmap);
+					updateFront = false;
+				}
+			}
+
+			Game.Renderer.RgbaSpriteRenderer.DrawSprite(mixerSprite, RenderOrigin, new float2(RenderBounds.Size));
+
+			var sprite = ChromeProvider.GetImage("lobby-bits", "colorpicker");
+			var pos = RenderOrigin + PxFromValue() - new int2(sprite.bounds.Width/2, sprite.bounds.Height/2);
+			WidgetUtils.FillRectWithColor(new Rectangle(pos.X + 3, pos.Y + 3, 10, 10), Color.ToColor());
+			Game.Renderer.RgbaSpriteRenderer.DrawSprite(sprite, pos);
+		}
+
+		void SetValueFromPx(int2 xy)
+		{
+			var rb = RenderBounds;
+			var s = SRange[0] + xy.X*(SRange[1] - SRange[0])/rb.Width;
+			var v = SRange[1] - xy.Y*(VRange[1] - VRange[0])/rb.Height;
+			S = s.Clamp(SRange[0], SRange[1]);
+			V = v.Clamp(VRange[0], VRange[1]);
+		}
+
+		int2 PxFromValue()
+		{
+			var rb = RenderBounds;
+			var x = RenderBounds.Width*(S - SRange[0])/(SRange[1] - SRange[0]);
+			var y = RenderBounds.Height*(1 - (V - VRange[0])/(VRange[1] - VRange[0]));
+			return new int2((int)x.Clamp(0, rb.Width), (int)y.Clamp(0, rb.Height));
+		}
+
+		public override bool HandleMouseInput(MouseInput mi)
+		{
+			if (mi.Button != MouseButton.Left)
+				return false;
+			if (mi.Event == MouseInputEvent.Down && !TakeFocus(mi))
+				return false;
+			if (!Focused)
+				return false;
+
+			switch (mi.Event)
+			{
+			case MouseInputEvent.Up:
+				isMoving = false;
+				LoseFocus(mi);
+				break;
+
+			case MouseInputEvent.Down:
+				isMoving = true;
+				SetValueFromPx(mi.Location - RenderOrigin);
+				OnChange();
+				break;
+
+			case MouseInputEvent.Move:
+				if (isMoving)
+				{
+					SetValueFromPx(mi.Location - RenderOrigin);
+					OnChange();
+				}
+				break;
+			}
+
+			return true;
+		}
+
+		public HSLColor Color { get { return HSLColor.FromHSV(H, S, V); } }
+
+		public void Set(float hue)
+		{
+			if (H != hue)
+			{
+				H = hue;
+				GenerateBitmap();
+				OnChange();
+			}
+		}
+
+		public void Set(HSLColor color)
+		{
+			float h,s,v;
+			color.ToHSV(out h, out s, out v);
+
+			if (H != h || S != s || V != v)
+			{
+				if (H != h)
+				{
+					H = h;
+					GenerateBitmap();
+				}
+
+				S = s.Clamp(SRange[0], SRange[1]);
+				V = v.Clamp(VRange[0], VRange[1]);
+				OnChange();
+			}
+		}
+	}
+}