Update palette, fix cell drawing

src/ConsoleBuffer/Buffer.cs

@@ -494,6 +494,33 @@ private Character.ColorInfo GetColorInfoFromBasicColor(Commands.SetGraphicsRendi
             }
         }
 
+        /// <summary>
+        /// Updates the colors of all cells in the buffer from the current palette if they have basic (16 color) values.
+        /// </summary>
+        public void UpdateBasicColorsFromPalette()
+        {
+            lock (this.renderLock)
+            {
+                for (var y = 0; y < this.BufferSize; ++y)
+                {
+                    var line = this.lines[y];
+                    for (var x = 0; x < line.Length; ++x)
+                    {
+                        var ch = line[x];
+                        if (ch.HasBasicBackgroundColor)
+                        {
+                            ch.Background = this.GetColorInfoFromBasicColor(ch.BasicBackgroundColor, ch.BackgroundBright);
+                        }
+                        if (ch.HasBasicForegroundColor)
+                        {
+                            ch.Foreground = this.GetColorInfoFromBasicColor(ch.BasicForegroundColor, ch.ForegroundBright);
+                        }
+                        line[x] = ch;
+                    }
+                }
+            }
+        }
+
         /// <summary>
         /// Render the currently "on-screen" area character-by-character onto the specified target.
         /// </summary>

src/ConsoleBuffer/Character.cs

@@ -16,6 +16,20 @@ public struct ColorInfo : IEquatable<ColorInfo>
             public byte G;
             public byte B;
 
+            public ColorInfo(string rgbValue)
+            {
+                this.R = this.G = this.B = 0;
+                if (rgbValue.Length != 7 || rgbValue[0] != '#')
+                {
+                    throw new ArgumentException(nameof(rgbValue));
+                }
+                for (var i = 1; i < 7; ++i)
+                {
+                    if (rgbValue[i] < '0' || rgbValue[i] > '9')
+                        throw new ArgumentException(nameof(rgbValue));
+                }
+            }
+
             public bool Equals(ColorInfo other)
             {
                 return (this.R == other.R && this.G == other.G && this.B == other.B);
@@ -65,6 +79,8 @@ public override string ToString()
         internal const short ForegroundExtendedFlag = 0x0040 << 6;
         internal const short BackgroundExtendedFlag = 0x0080 << 6;
 
+        internal const short DefaultOptions = (0x7 | ForegroundBasicColorFlag | BackgroundBasicColorFlag);
+
         internal short Options;
 
         internal static short GetColorFlags(Commands.SetGraphicsRendition.Colors color, bool background)

src/ConsoleBuffer/Line.cs

@@ -10,10 +10,14 @@ public sealed class Line : IEnumerable<Character>
 
         public int Length => this.chars.Count;
 
+        // XXX: should probably remove users of Get/Set and just have them call this for clarity.
+        public Character this[int pos] { get => this.Get(pos); set => this.Set(pos, value); }
+
         public Line()
         {
             var hintSize = 80;
             this.chars = new List<Character>(hintSize);
+            this[0] = new Character { Glyph = 0x20, Options = Character.DefaultOptions };
         }
 
         /// <summary>
@@ -39,7 +43,10 @@ public Character Get(int pos)
                 return this.chars[pos];
             }
 
-            return new Character { Glyph = 0x20 };
+            // for short lines we can lazily keep the attributes (specifically background) from whatever our last character was, assuming we had one.
+            var ch = this.chars.Count > 0 ? this.chars[this.chars.Count - 1] : new Character { Options = Character.DefaultOptions };
+            ch.Glyph = 0x20;
+            return ch;
         }
 
         /// <summary>

src/ConsoleBuffer/XtermPalette.cs

@@ -288,6 +288,10 @@ public Character.ColorInfo this[int id]
             {
                 return this.colorPalette[id];
             }
+            set
+            {
+                this.colorPalette[id] = value;
+            }
         }
 
         public Character.ColorInfo this[string name]

src/condo/MainWindow.xaml

@@ -6,7 +6,7 @@
         xmlns:local="clr-namespace:condo"
         mc:Ignorable="d"
         Title="MainWindow" SizeToContent="WidthAndHeight">
-    <Grid Background="Black">
+    <Grid>
         <ScrollViewer Name="scrollViewer" CanContentScroll="true" IsDeferredScrollingEnabled="true" Focusable="False">
             <local:Screen x:Name="screen" />
         </ScrollViewer>

src/condo/MainWindow.xaml.cs

@@ -12,6 +12,7 @@ namespace condo
     public partial class MainWindow : Window
     {
         private const int MinimumWindowsVersion = 17763;
+        private readonly XtermPalette mellowPalette;
         private ConsoleWrapper console;
         private KeyHandler keyHandler;
 
@@ -36,6 +37,27 @@ public MainWindow()
         {
             this.InitializeComponent();
             this.Loaded += this.OnLoaded;
+
+            // XXX: lazy dark but not painfully bright palette
+            this.mellowPalette = new XtermPalette();
+            this.mellowPalette[0] = new Character.ColorInfo { R = 0x1d, G = 0x1f, B = 0x21 };
+            this.mellowPalette[1] = new Character.ColorInfo { R = 0xa5, G = 0x42, B = 0x42 };
+            this.mellowPalette[2] = new Character.ColorInfo { R = 0x8c, G = 0x94, B = 0x40 };
+            this.mellowPalette[3] = new Character.ColorInfo { R = 0xde, G = 0x93, B = 0x5f };
+            this.mellowPalette[4] = new Character.ColorInfo { R = 0x5f, G = 0x81, B = 0x9d };
+            this.mellowPalette[5] = new Character.ColorInfo { R = 0x85, G = 0x67, B = 0x8f };
+            this.mellowPalette[6] = new Character.ColorInfo { R = 0x5e, G = 0x8d, B = 0x87 };
+            this.mellowPalette[7] = new Character.ColorInfo { R = 0x70, G = 0x78, B = 0x80 };
+            this.mellowPalette[8] = new Character.ColorInfo { R = 0x37, G = 0x3b, B = 0x41 };
+            this.mellowPalette[9] = new Character.ColorInfo { R = 0xcc, G = 0x66, B = 0x66 };
+            this.mellowPalette[10] = new Character.ColorInfo { R = 0xb5, G = 0xbd, B = 0x68 };
+            this.mellowPalette[11] = new Character.ColorInfo { R = 0xf0, G = 0xc6, B = 0x74 };
+            this.mellowPalette[12] = new Character.ColorInfo { R = 0x81, G = 0xa2, B = 0xbe };
+            this.mellowPalette[13] = new Character.ColorInfo { R = 0xb2, G = 0x94, B = 0xbb };
+            this.mellowPalette[14] = new Character.ColorInfo { R = 0x8a, G = 0xbe, B = 0xb7 };
+            this.mellowPalette[15] = new Character.ColorInfo { R = 0xc5, G = 0xc8, B = 0xc6 };
+
+            this.screen.Palette = this.mellowPalette;
         }
 
         private void OnLoaded(object sender, RoutedEventArgs e)

src/condo/Screen.cs

@@ -36,7 +36,20 @@ public ConsoleBuffer.Buffer Buffer
             }
         }
 
-        private readonly XtermPalette palette = XtermPalette.Default;
+        private XtermPalette palette = XtermPalette.Default;
+        public XtermPalette Palette
+        {
+            get
+            {
+                return this.palette;
+            }
+            set
+            {
+                this.palette = value;
+                this.buffer.Palette = this.palette;
+                this.buffer.UpdateBasicColorsFromPalette();
+            }
+        }
 
         private VisualCollection cells;
         private DpiScale dpiInfo;
@@ -45,6 +58,7 @@ public ConsoleBuffer.Buffer Buffer
         private readonly double cellWidth, cellHeight;
         private readonly Point baselineOrigin;
         private readonly Rect cellRectangle;
+        private readonly GuidelineSet cellGuidelines;
         private int horizontalCells, verticalCells;
         private DrawCharacter[,] characters;
         bool cursorInverted;
@@ -71,6 +85,7 @@ public Screen() : this(new ConsoleBuffer.Buffer(80, 25))
 
         public Screen(ConsoleBuffer.Buffer buffer)
         {
+            this.UseLayoutRounding = true;
             this.dpiInfo = VisualTreeHelper.GetDpi(this);
             this.cells = new VisualCollection(this);
             if (!new Typeface("Consolas").TryGetGlyphTypeface(out this.typeface))
@@ -81,6 +96,8 @@ public Screen(ConsoleBuffer.Buffer buffer)
             this.cellHeight = this.typeface.Height * this.fontSize;
             this.baselineOrigin = new Point(0, this.typeface.Baseline * this.fontSize);
             this.cellRectangle = new Rect(new Size(this.cellWidth, this.cellHeight));
+            this.cellGuidelines = new GuidelineSet(new[] { this.cellRectangle.Left, this.cellRectangle.Right }, new[] { this.cellRectangle.Top, this.cellRectangle.Bottom });
+            this.cellGuidelines.Freeze();
 
             this.Buffer = buffer;
             this.cursorBlinkWatch.Start();
@@ -198,9 +215,12 @@ public void SetCellCharacter(int x, int y, bool invert = false)
 
             using (var dc = this.GetCell(x, y).RenderOpen())
             {
+                var backgroundRectangle = new Rect(0, 0, this.cellWidth, this.cellHeight);
+                var gs = new GuidelineSet();
+                dc.PushGuidelineSet(this.cellGuidelines);
                 var backgroundBrush = this.brushCache.GetBrush(ch.Background.R, ch.Background.G, ch.Background.B);
                 var foregroundBrush = this.brushCache.GetBrush(ch.Foreground.R, ch.Foreground.G, ch.Foreground.B);
-                dc.DrawRectangle(!invert ? backgroundBrush : foregroundBrush, null, new Rect(new Point(0, 0), new Point(this.cellWidth, this.cellHeight)));
+                dc.DrawRectangle(!invert ? backgroundBrush : foregroundBrush, null, this.cellRectangle);
 
                 if (ch.Foreground == ch.Background) return; // no need to draw same color glyph.