87376e14a9
Make sure we don't save the same image twice This can happen if there are two requests very close together and the response has not be received before the second request.
280 lines
No EOL
8.2 KiB
C#
280 lines
No EOL
8.2 KiB
C#
/*
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Copyright (c) 2014, Lars Brubaker
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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The views and conclusions contained in the software and documentation are those
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of the authors and should not be interpreted as representing official policies,
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either expressed or implied, of the FreeBSD Project.
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*/
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Net;
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using System.Net.Http;
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using System.Threading.Tasks;
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using MatterHackers.Agg;
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using MatterHackers.Agg.Image;
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using MatterHackers.Agg.Platform;
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using MatterHackers.Agg.UI;
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namespace MatterHackers.MatterControl
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{
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public static class WebCache
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{
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private static string _cachePath = ".";
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public static string CachePath
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{
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get => _cachePath;
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set
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{
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_cachePath = value;
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// make sure it exists
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Directory.CreateDirectory(value);
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}
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}
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private static HashSet<string> savedImages = new HashSet<string>();
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/// <summary>
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/// Download an image from the web into the specified ImageBuffer
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/// </summary>
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/// <param name="uri"></param>
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public static void RetrieveImageAsync(ImageBuffer imageToLoadInto, string uriToLoad, bool scaleToImageX, IRecieveBlenderByte scalingBlender = null)
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{
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var longHash = uriToLoad.GetLongHashCode();
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string imageFileName = Path.Combine(CachePath, longHash.ToString() + ".png");
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if (File.Exists(imageFileName))
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{
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try
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{
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LoadImageInto(imageToLoadInto, scaleToImageX, scalingBlender, new StreamReader(imageFileName).BaseStream);
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return;
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}
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catch
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{
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}
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}
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WebClient client = new WebClient();
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client.DownloadDataCompleted += (sender, e) =>
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{
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try // if we get a bad result we can get a target invocation exception. In that case just don't show anything
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{
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Stream stream = new MemoryStream(e.Result);
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LoadImageInto(imageToLoadInto, scaleToImageX, scalingBlender, stream);
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if (imageToLoadInto.Width > 0
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&& imageToLoadInto.Height > 0
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&& !savedImages.Contains(imageFileName))
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{
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savedImages.Add(imageFileName);
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AggContext.ImageIO.SaveImageData(imageFileName, imageToLoadInto);
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}
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}
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catch
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{
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}
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};
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try
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{
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client.DownloadDataAsync(new Uri(uriToLoad));
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}
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catch
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{
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}
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}
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/// <summary>
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/// Download an image from the web into the specified ImageSequence
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/// </summary>
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/// <param name="uri"></param>
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public static void RetrieveImageSquenceAsync(ImageSequence imageSequenceToLoadInto, string uriToLoad)
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{
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var asyncImageSequence = new ImageSequence();
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var longHash = uriToLoad.GetLongHashCode();
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string pngFileName = Path.Combine(CachePath, longHash.ToString() + ".png");
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string gifFileName = Path.Combine(CachePath, longHash.ToString() + ".gif");
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if (File.Exists(pngFileName))
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{
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try
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{
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Task.Run(() =>
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{
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AggContext.StaticData.LoadImageSequenceData(new StreamReader(pngFileName).BaseStream, asyncImageSequence);
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UiThread.RunOnIdle(() =>
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{
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imageSequenceToLoadInto.Copy(asyncImageSequence);
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imageSequenceToLoadInto.Invalidate();
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});
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});
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return;
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}
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catch
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{
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}
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}
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else if (File.Exists(gifFileName))
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{
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try
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{
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Task.Run(() =>
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{
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AggContext.StaticData.LoadImageSequenceData(new StreamReader(gifFileName).BaseStream, asyncImageSequence);
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UiThread.RunOnIdle(() =>
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{
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imageSequenceToLoadInto.Copy(asyncImageSequence);
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imageSequenceToLoadInto.Invalidate();
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});
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});
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return;
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}
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catch
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{
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}
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}
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WebClient client = new WebClient();
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client.DownloadDataCompleted += (object sender, DownloadDataCompletedEventArgs e) =>
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{
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try // if we get a bad result we can get a target invocation exception. In that case just don't show anything
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{
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Task.Run(() =>
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{
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// scale the loaded image to the size of the target image
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byte[] raw = e.Result;
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Stream stream = new MemoryStream(raw);
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AggContext.StaticData.LoadImageSequenceData(stream, asyncImageSequence);
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if (asyncImageSequence.Frames.Count == 1)
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{
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// save the as png
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AggContext.ImageIO.SaveImageData(pngFileName, asyncImageSequence.Frames[0]);
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}
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else // save original stream as gif
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{
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using (var writter = new FileStream(gifFileName, FileMode.Create))
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{
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stream.Position = 0;
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stream.CopyTo(writter);
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}
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}
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UiThread.RunOnIdle(() =>
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{
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imageSequenceToLoadInto.Copy(asyncImageSequence);
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imageSequenceToLoadInto.Invalidate();
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});
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});
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}
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catch
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{
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}
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};
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try
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{
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client.DownloadDataAsync(new Uri(uriToLoad));
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}
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catch
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{
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}
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}
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public static void RetrieveText(string uriToLoad, Action<string> updateResult)
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{
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var longHash = uriToLoad.GetLongHashCode();
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string textFileName = Path.Combine(CachePath, longHash.ToString() + ".txt");
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string fileText = null;
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if (File.Exists(textFileName))
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{
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try
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{
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fileText = File.ReadAllText(textFileName);
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updateResult?.Invoke(fileText);
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}
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catch
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{
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}
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}
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Task.Run(async () =>
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{
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var client = new HttpClient();
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var text = await client.GetStringAsync(uriToLoad);
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if (text != fileText)
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{
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File.WriteAllText(textFileName, text);
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updateResult?.Invoke(text);
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}
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});
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}
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private static void LoadImageInto(ImageBuffer imageToLoadInto, bool scaleToImageX, IRecieveBlenderByte scalingBlender, Stream stream)
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{
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if (scalingBlender == null)
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{
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scalingBlender = new BlenderBGRA();
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}
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ImageBuffer unScaledImage = new ImageBuffer(10, 10);
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if (scaleToImageX)
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{
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// scale the loaded image to the size of the target image
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AggContext.StaticData.LoadImageData(stream, unScaledImage);
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// If the source image (the one we downloaded) is more than twice as big as our dest image.
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while (unScaledImage.Width > imageToLoadInto.Width * 2)
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{
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// The image sampler we use is a 2x2 filter so we need to scale by a max of 1/2 if we want to get good results.
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// So we scale as many times as we need to get the Image to be the right size.
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// If this were going to be a non-uniform scale we could do the x and y separately to get better results.
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ImageBuffer halfImage = new ImageBuffer(unScaledImage.Width / 2, unScaledImage.Height / 2, 32, scalingBlender);
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halfImage.NewGraphics2D().Render(unScaledImage, 0, 0, 0, halfImage.Width / (double)unScaledImage.Width, halfImage.Height / (double)unScaledImage.Height);
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unScaledImage = halfImage;
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}
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double finalScale = imageToLoadInto.Width / (double)unScaledImage.Width;
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imageToLoadInto.Allocate(imageToLoadInto.Width, (int)(unScaledImage.Height * finalScale), imageToLoadInto.Width * (imageToLoadInto.BitDepth / 8), imageToLoadInto.BitDepth);
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imageToLoadInto.NewGraphics2D().Render(unScaledImage, 0, 0, 0, finalScale, finalScale);
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imageToLoadInto.MarkImageChanged();
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}
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else
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{
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AggContext.StaticData.LoadImageData(stream, imageToLoadInto);
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imageToLoadInto.MarkImageChanged();
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}
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}
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}
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} |