XAML-Map-Control/MapImages/UWP/GroundOverlayPanel.UWP.cs

// XAML Map Control - https://github.com/ClemensFischer/XAML-Map-Control
// © 2018 Clemens Fischer
// Licensed under the Microsoft Public License (Ms-PL)

using System;
using System.Collections.Generic;
using System.IO;
using System.IO.Compression;
using System.Linq;
using System.Threading.Tasks;
using System.Xml;
using Windows.Storage;

namespace MapControl.Images
{
    public partial class GroundOverlayPanel
    {
        private async Task<List<ImageOverlay>> ReadGroundOverlaysFromFile(string docFile)
        {
            if (!Path.IsPathRooted(docFile))
            {
                docFile = Path.Combine(Directory.GetCurrentDirectory(), docFile);
            }

            var docUri = new Uri(docFile);

            var imageOverlays = await Task.Run(async () =>
            {
                var file = await StorageFile.GetFileFromPathAsync(docFile);
                var kmlDocument = new XmlDocument();

                using (var stream = await file.OpenReadAsync())
                {
                    kmlDocument.Load(stream.AsStreamForRead());
                }

                return ReadGroundOverlays(kmlDocument).ToList();
            });

            foreach (var imageOverlay in imageOverlays)
            {
                imageOverlay.ImageSource = await ImageLoader.LoadImageAsync(new Uri(docUri, imageOverlay.ImagePath));
            }

            return imageOverlays;
        }

        private async Task<List<ImageOverlay>> ReadGroundOverlaysFromArchive(string archiveFile)
        {
            using (var archive = ZipFile.OpenRead(archiveFile))
            {
                var docEntry = archive.GetEntry("doc.kml")
                    ?? archive.Entries.FirstOrDefault(e => e.Name.EndsWith(".kml"));

                if (docEntry == null)
                {
                    throw new ArgumentException("No KML entry found in " + archiveFile);
                }

                var imageOverlays = await Task.Run(() =>
                {
                    var kmlDocument = new XmlDocument();

                    using (var docStream = docEntry.Open())
                    {
                        kmlDocument.Load(docStream);
                    }

                    return ReadGroundOverlays(kmlDocument).ToList();
                });

                foreach (var imageOverlay in imageOverlays)
                {
                    var imageEntry = archive.GetEntry(imageOverlay.ImagePath);

                    if (imageEntry != null)
                    {
                        using (var zipStream = imageEntry.Open())
                        using (var memoryStream = new MemoryStream())
                        {
                            await zipStream.CopyToAsync(memoryStream);
                            memoryStream.Position = 0;
                            imageOverlay.ImageSource = await ImageLoader.LoadImageAsync(memoryStream.AsRandomAccessStream());
                        }
                    }
                }

                return imageOverlays;
            }
        }
    }
}