From 01339e817231c6c5945f214d029ce6c6035be280 Mon Sep 17 00:00:00 2001
From: UnknownShadow200 <unknownshadow200@gmail.com>
Date: Thu, 6 Oct 2016 12:35:02 +1100
Subject: [PATCH] Launcher: Add a basic bitmap widget.

---
 Launcher2/Gui/Screens/Screen.cs          |  3 ++
 Launcher2/Gui/Views/DirectConnectView.cs |  4 +-
 Launcher2/Gui/Widgets/BitmapWidget.cs    | 58 ++++++++++++++++++++++++
 Launcher2/Gui/Widgets/Makers.cs          | 16 ++++++-
 Launcher2/Launcher2.csproj               |  1 +
 5 files changed, 79 insertions(+), 3 deletions(-)
 create mode 100644 Launcher2/Gui/Widgets/BitmapWidget.cs

diff --git a/Launcher2/Gui/Screens/Screen.cs b/Launcher2/Gui/Screens/Screen.cs
index 814557959..870ada2fc 100644
--- a/Launcher2/Gui/Screens/Screen.cs
+++ b/Launcher2/Gui/Screens/Screen.cs
@@ -61,6 +61,9 @@ namespace Launcher.Gui.Screens {
 				game.ResetArea( label.X, label.Y, label.Width, label.Height );
 				RedrawWidget( label );
 			}
+			
+			BitmapWidget bitmap = widget as BitmapWidget;
+			if( bitmap != null ) RedrawWidget( bitmap );
 		}
 		
 		/// <summary>Redraws the given widget and marks the window as needing to be redrawn. </summary>
diff --git a/Launcher2/Gui/Views/DirectConnectView.cs b/Launcher2/Gui/Views/DirectConnectView.cs
index c389523bc..5c2933c92 100644
--- a/Launcher2/Gui/Views/DirectConnectView.cs
+++ b/Launcher2/Gui/Views/DirectConnectView.cs
@@ -4,7 +4,7 @@ using System.Drawing;
 using ClassicalSharp;
 using Launcher.Gui.Widgets;
 
-namespace Launcher.Gui.Views {	
+namespace Launcher.Gui.Views {
 	public sealed class DirectConnectView : IView {
 		
 		internal int connectIndex, backIndex, ccSkinsIndex, statusIndex;
@@ -45,7 +45,7 @@ namespace Launcher.Gui.Views {
 			
 			connectIndex = widgetIndex;
 			Makers.Button( this, "Connect", 110, 35, titleFont )
-				.SetLocation( Anchor.Centre, Anchor.Centre, -110, 50 );			
+				.SetLocation( Anchor.Centre, Anchor.Centre, -110, 50 );
 			backIndex = widgetIndex;
 			Makers.Button( this, "Back", 80, 35, titleFont )
 				.SetLocation( Anchor.Centre, Anchor.Centre, 125, 50 );
diff --git a/Launcher2/Gui/Widgets/BitmapWidget.cs b/Launcher2/Gui/Widgets/BitmapWidget.cs
new file mode 100644
index 000000000..6360d0d03
--- /dev/null
+++ b/Launcher2/Gui/Widgets/BitmapWidget.cs
@@ -0,0 +1,58 @@
+// ClassicalSharp copyright 2014-2016 UnknownShadow200 | Licensed under MIT
+using System;
+using ClassicalSharp;
+
+namespace Launcher.Gui.Widgets {
+	/// <summary> Represents an image that cannot be modified by the user. </summary>
+	/// <remarks> Uses 4 bit (16 colour) palette. </remarks>
+	public sealed class BitmapWidget : Widget {
+		
+		/// <summary> The raw indices within the palette that make up this image. </summary>
+		public byte[] Indices;
+		
+		/// <summary> The ARGB palette for this image. </summary>
+		public FastColour[] Palette;
+		
+		public BitmapWidget( LauncherWindow window, int size,
+		                    byte[] indices, FastColour[] palette ) : base( window ) {
+			Indices = indices;
+			Palette = palette;
+			Width = size; Height = size;
+		}
+		
+		public unsafe override void Redraw( IDrawer2D drawer ) {
+			if( Window.Minimised || !Visible ) return;
+			int* palette = stackalloc int[Palette.Length];
+			CalculatePalette( palette );
+			
+			using( FastBitmap bmp = Window.LockBits() ) {
+				int i = 0;
+				for( int yy = 0; yy < Height; yy++ ) {
+					if( (Y + yy) < 0 ) continue;
+					if( (Y + yy) >= bmp.Height ) break;
+					int* row = bmp.GetRowPtr( Y + yy );
+					
+					for( int xx = 0; xx < Width; xx++ ) {
+						int index = Indices[i >> 1]; // each byte has even and odd 4bits
+						int selector = 4 * ((i + 1) & 1);
+						index = (index >> selector) & 0xF;
+						i++;
+						
+						int col = palette[index];
+						if( col == 0 ) continue; // transparent pixel
+						if( (X + xx) < 0 || (X + xx) >= bmp.Width ) continue;
+						row[X + xx] = col;
+					}
+				}
+			}
+		}
+		
+		unsafe void CalculatePalette( int* palette ) {
+			for( int i = 0; i < Palette.Length; i++ ) {
+				FastColour col = Palette[i];
+				if( !Active ) col = FastColour.Scale( col, 0.7f );
+				palette[i] = col.ToArgb();
+			}
+		}
+	}
+}
diff --git a/Launcher2/Gui/Widgets/Makers.cs b/Launcher2/Gui/Widgets/Makers.cs
index 5b0966e2b..69387fede 100644
--- a/Launcher2/Gui/Widgets/Makers.cs
+++ b/Launcher2/Gui/Widgets/Makers.cs
@@ -3,7 +3,7 @@ using System.Drawing;
 using ClassicalSharp;
 using Launcher.Gui.Views;
 
-namespace Launcher.Gui.Widgets {	
+namespace Launcher.Gui.Widgets {
 	/// <summary> Helper methods to construct widgets. </summary>
 	public static class Makers {
 		
@@ -85,5 +85,19 @@ namespace Launcher.Gui.Widgets {
 			view.widgetIndex++;
 			return widget;
 		}
+		
+		public static Widget Bitmap( IView view, byte[] indices, 
+		                            FastColour[] palette, int size ) {
+			BitmapWidget widget;
+			if( view.widgets[view.widgetIndex] != null ) {
+				widget = (BitmapWidget)view.widgets[view.widgetIndex];
+			} else {
+				widget = new BitmapWidget( view.game, size, indices, palette );
+				view.widgets[view.widgetIndex] = widget;
+			}
+			
+			view.widgetIndex++;
+			return widget;
+		}
 	}
 }
diff --git a/Launcher2/Launcher2.csproj b/Launcher2/Launcher2.csproj
index 100e687ad..c134118fd 100644
--- a/Launcher2/Launcher2.csproj
+++ b/Launcher2/Launcher2.csproj
@@ -85,6 +85,7 @@
     <Compile Include="Gui\Views\ResourcesView.cs" />
     <Compile Include="Gui\Views\ServersView.cs" />
     <Compile Include="Gui\Views\UpdatesView.cs" />
+    <Compile Include="Gui\Widgets\BitmapWidget.cs" />
     <Compile Include="Gui\Widgets\CheckboxWidget.cs" />
     <Compile Include="Gui\Widgets\InputText.cs" />
     <Compile Include="Gui\Widgets\ButtonWidget.cs" />