398 lines
No EOL
12 KiB
C#
398 lines
No EOL
12 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;
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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 HashSet<string> savedImages = new HashSet<string>();
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private static object locker = new object();
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// Download an image from the web into the specified ImageBuffer
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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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if (scaleToImageX)
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{
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longHash = imageToLoadInto.Width.GetLongHashCode(longHash);
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}
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var imageFileName = ApplicationController.CacheablePath("Images", 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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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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// Download an image from the web into the specified ImageSequence
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public static void RetrieveImageSquenceAsync(ImageSequence imageSequenceToLoadInto,
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string uriToLoad,
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Action doneLoading = null)
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{
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var asyncImageSequence = new ImageSequence();
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var longHash = uriToLoad.GetLongHashCode();
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var pngFileName = ApplicationController.CacheablePath("Images", longHash.ToString() + ".png");
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var gifFileName = ApplicationController.CacheablePath("Images", 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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lock (locker)
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{
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StaticData.Instance.LoadImageSequenceData(new StreamReader(pngFileName).BaseStream, asyncImageSequence);
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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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doneLoading?.Invoke();
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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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Task.Run(() =>
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{
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try
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{
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lock (locker)
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{
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StaticData.Instance.LoadImageSequenceData(new StreamReader(gifFileName).BaseStream, asyncImageSequence);
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}
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if (asyncImageSequence.NumFrames > 0)
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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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doneLoading?.Invoke();
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});
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}
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else
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{
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DownloadImageAsync(imageSequenceToLoadInto, uriToLoad, doneLoading, asyncImageSequence, pngFileName, gifFileName);
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}
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}
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catch
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{
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DownloadImageAsync(imageSequenceToLoadInto, uriToLoad, doneLoading, asyncImageSequence, pngFileName, gifFileName);
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}
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});
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return;
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}
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DownloadImageAsync(imageSequenceToLoadInto, uriToLoad, doneLoading, asyncImageSequence, pngFileName, gifFileName);
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}
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private static void DownloadImageAsync(ImageSequence imageSequenceToLoadInto, string uriToLoad, Action doneLoading, ImageSequence asyncImageSequence, string pngFileName, string gifFileName)
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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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lock (locker)
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{
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StaticData.Instance.LoadImageSequenceData(stream, asyncImageSequence);
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}
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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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lock (locker)
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{
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if (!File.Exists(pngFileName))
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{
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ImageIO.SaveImageData(pngFileName, asyncImageSequence.Frames[0]);
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}
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}
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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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doneLoading?.Invoke();
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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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/// <summary>
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/// Return the first result that can be found (usually the cache). Wait up to 5 seconds to populate the cache
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/// if it does not exist.
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/// </summary>
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/// <param name="uriToLoad"></param>
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/// <param name="addToAppCache"></param>
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/// <param name="addHeaders"></param>
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/// <returns></returns>
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public static string GetCachedText(string uriToLoad,
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bool addToAppCache = true,
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Action<HttpRequestMessage> addHeaders = null)
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{
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string results = null;
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WebCache.RetrieveText(uriToLoad,
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(content) =>
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{
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results = content;
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},
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false,
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addHeaders);
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var startTime = UiThread.CurrentTimerMs;
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// wait up to 5 seconds for a response
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while (results == null
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&& UiThread.CurrentTimerMs < startTime + 5000)
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{
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Thread.Sleep(10);
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}
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return results;
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}
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/// <summary>
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/// Retrieve text from a url async, but first return any existing cache of the text synchronously
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/// </summary>
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/// <param name="uriToLoad">The web path to find the text, will also be used as the cache key</param>
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/// <param name="updateResult">A function to call when the text is received if it is different than the cache.</param>
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/// <param name="addToAppCache">Add the results to a directory that can be copied into the main distribution,
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/// or add them to a directory that is only for the local machine.</param>
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public static void RetrieveText(string uriToLoad,
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Action<string> updateResult,
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bool addToAppCache = true,
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Action<HttpRequestMessage> addHeaders = null)
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{
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if (addToAppCache)
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{
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RetrieveText(uriToLoad, "TextWebCache", updateResult, addHeaders);
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}
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else
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{
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RetrieveText(uriToLoad, "Text", updateResult, addHeaders);
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}
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}
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private static void RetrieveText(string uriToLoad,
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string cacheFolder,
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Action<string> updateResult,
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Action<HttpRequestMessage> addHeaders = null)
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{
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var longHash = uriToLoad.GetLongHashCode();
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var appDataFileName = ApplicationController.CacheablePath(cacheFolder, longHash.ToString() + ".txt");
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string fileText = null;
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// first try the cache in the users applications folder
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if (File.Exists(appDataFileName))
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{
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try
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{
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lock (locker)
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{
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fileText = File.ReadAllText(appDataFileName);
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}
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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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else // We could not find it in the application cache. Check if it is in static data.
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{
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var staticDataPath = Path.Combine(cacheFolder, longHash.ToString() + ".txt");
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if (StaticData.Instance.FileExists(staticDataPath))
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{
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try
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{
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lock (locker)
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{
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fileText = StaticData.Instance.ReadAllText(staticDataPath);
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}
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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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}
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// whether we find it or not check the web for the latest version
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Task.Run(async () =>
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{
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var requestMessage = new HttpRequestMessage(HttpMethod.Get, uriToLoad);
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addHeaders?.Invoke(requestMessage);
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using (var client = new HttpClient())
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{
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using (HttpResponseMessage response = await client.SendAsync(requestMessage))
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{
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var text = await response.Content.ReadAsStringAsync();
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if (!string.IsNullOrEmpty(text)
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&& text != fileText)
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{
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File.WriteAllText(appDataFileName, text);
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updateResult?.Invoke(text);
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}
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}
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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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lock (locker)
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{
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// scale the loaded image to the size of the target image
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StaticData.Instance.LoadImageData(stream, unScaledImage);
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}
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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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}
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else
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{
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StaticData.Instance.LoadImageData(stream, imageToLoadInto);
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}
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imageToLoadInto.MarkImageChanged();
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}
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}
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} |