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+using SixLabors.ImageSharp;
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+using SixLabors.ImageSharp.ColorSpaces;
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+using SixLabors.ImageSharp.PixelFormats;
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+using SixLabors.ImageSharp.Processing;
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+using System;
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+using System.Collections.Concurrent;
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+using System.Collections.Generic;
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+using System.IO;
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+using Terminal.Gui;
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+using Attribute = Terminal.Gui.Attribute;
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+
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+namespace UICatalog.Scenarios {
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+ [ScenarioMetadata (Name: "Images", Description: "Demonstration of how to render an image with/without true color support.")]
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+ [ScenarioCategory ("Colors")]
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+ public class Images : Scenario
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+ {
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+ public override void Setup ()
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+ {
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+ base.Setup ();
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+
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+ var x = 0;
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+ var y = 0;
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+
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+ var canTrueColor = Application.Driver.SupportsTrueColorOutput;
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+
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+ var lblDriverName = new Label ($"Current driver is {Application.Driver.GetType ().Name}") {
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+ X = x,
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+ Y = y++
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+ };
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+ Win.Add (lblDriverName);
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+ y++;
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+
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+ var cbSupportsTrueColor = new CheckBox ("Driver supports true color ") {
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+ X = x,
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+ Y = y++,
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+ Checked = canTrueColor,
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+ CanFocus = false
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+ };
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+ Win.Add (cbSupportsTrueColor);
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+
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+ var cbUseTrueColor = new CheckBox ("Use true color") {
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+ X = x,
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+ Y = y++,
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+ Checked = Application.Driver.UseTrueColor,
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+ Enabled = canTrueColor,
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+ };
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+ cbUseTrueColor.Toggled += (_) => Application.Driver.UseTrueColor = cbUseTrueColor.Checked;
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+ Win.Add (cbUseTrueColor);
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+
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+ var btnOpenImage = new Button ("Open Image") {
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+ X = x,
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+ Y = y++
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+ };
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+ Win.Add (btnOpenImage);
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+
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+ var imageView = new ImageView () {
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+ X = x,
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+ Y = y++,
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+ Width = Dim.Fill(),
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+ Height = Dim.Fill(),
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+ };
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+ Win.Add (imageView);
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+
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+ btnOpenImage.Clicked += () => {
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+ var ofd = new OpenDialog ("Open Image", "Image");
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+ Application.Run (ofd);
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+
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+ var path = ofd.FilePath.ToString ();
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+
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+ if (string.IsNullOrWhiteSpace (path)) {
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+ return;
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+ }
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+
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+ if(!File.Exists(path)) {
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+ return;
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+ }
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+
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+ imageView.SetImage(Image.Load<Rgba32> (File.ReadAllBytes (path)));
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+ };
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+ }
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+
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+ class ImageView : View {
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+
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+ private Image<Rgba32> fullResImage;
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+ private Image<Rgba32> matchSize;
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+
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+ ConcurrentDictionary<Rgba32, Attribute> cache = new ConcurrentDictionary<Rgba32, Attribute>();
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+
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+ internal void SetImage (Image<Rgba32> image)
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+ {
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+ fullResImage = image;
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+ this.SetNeedsDisplay ();
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+ }
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+
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+ public override void Redraw (Rect bounds)
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+ {
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+ base.Redraw (bounds);
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+
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+ if (fullResImage == null) {
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+ return;
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+ }
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+
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+ // if we have not got a cached resized image of this size
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+ if(matchSize == null || bounds.Width != matchSize.Width || bounds.Height != matchSize.Height) {
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+
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+ // generate one
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+ matchSize = fullResImage.Clone (x => x.Resize (bounds.Width, bounds.Height));
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+ }
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+
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+ for (int y = 0; y < bounds.Height; y++) {
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+ for (int x = 0; x < bounds.Width; x++) {
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+ var rgb = matchSize [x, y];
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+
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+ var attr = cache.GetOrAdd (rgb, (rgb) => new Attribute (new TrueColor (), new TrueColor (rgb.R, rgb.G, rgb.B)));
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+
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+ Driver.SetAttribute(attr);
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+ AddRune (x, y, ' ');
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+ }
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+ }
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+ }
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+ }
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+ }
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+}
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tznind