162 lines
6.5 KiB
C#
162 lines
6.5 KiB
C#
/*
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*
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* (c) Copyright Ascensio System Limited 2010-2018
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*
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* This program is freeware. You can redistribute it and/or modify it under the terms of the GNU
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* General Public License (GPL) version 3 as published by the Free Software Foundation (https://www.gnu.org/copyleft/gpl.html).
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* In accordance with Section 7(a) of the GNU GPL its Section 15 shall be amended to the effect that
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* Ascensio System SIA expressly excludes the warranty of non-infringement of any third-party rights.
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*
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* THIS PROGRAM IS DISTRIBUTED WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY OR
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* FITNESS FOR A PARTICULAR PURPOSE. For more details, see GNU GPL at https://www.gnu.org/copyleft/gpl.html
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*
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* You can contact Ascensio System SIA by email at sales@onlyoffice.com
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*
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* The interactive user interfaces in modified source and object code versions of ONLYOFFICE must display
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* Appropriate Legal Notices, as required under Section 5 of the GNU GPL version 3.
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*
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* Pursuant to Section 7 § 3(b) of the GNU GPL you must retain the original ONLYOFFICE logo which contains
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* relevant author attributions when distributing the software. If the display of the logo in its graphic
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* form is not reasonably feasible for technical reasons, you must include the words "Powered by ONLYOFFICE"
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* in every copy of the program you distribute.
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* Pursuant to Section 7 § 3(e) we decline to grant you any rights under trademark law for use of our trademarks.
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*
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*/
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using System;
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using System.Drawing;
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using System.Drawing.Drawing2D;
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using System.Drawing.Imaging;
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using System.IO;
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using System.Linq;
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namespace ASC.Web.Core
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{
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public class CommonPhotoManager
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{
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public static Image DoThumbnail(Image image, Size size, bool crop, bool transparent, bool rectangle)
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{
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var width = size.Width;
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var height = size.Height;
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var realWidth = image.Width;
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var realHeight = image.Height;
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var thumbnail = new Bitmap(width, height);
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var maxSide = realWidth > realHeight ? realWidth : realHeight;
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var minSide = realWidth < realHeight ? realWidth : realHeight;
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var alignWidth = true;
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if (crop) alignWidth = (minSide == realWidth);
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else alignWidth = (maxSide == realWidth);
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double scaleFactor = (alignWidth) ? (realWidth / (1.0 * width)) : (realHeight / (1.0 * height));
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if (scaleFactor < 1) scaleFactor = 1;
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int locationX, locationY;
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int finalWidth, finalHeigth;
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finalWidth = (int)(realWidth / scaleFactor);
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finalHeigth = (int)(realHeight / scaleFactor);
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if (rectangle)
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{
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locationY = (int)((height / 2.0) - (finalHeigth / 2.0));
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locationX = (int)((width / 2.0) - (finalWidth / 2.0));
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var rect = new Rectangle(locationX, locationY, finalWidth, finalHeigth);
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using (var graphic = Graphics.FromImage(thumbnail))
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{
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if (!transparent)
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{
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graphic.Clear(Color.White);
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graphic.SmoothingMode = SmoothingMode.HighQuality;
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}
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graphic.InterpolationMode = InterpolationMode.HighQualityBicubic;
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graphic.PixelOffsetMode = PixelOffsetMode.HighQuality;
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using (ImageAttributes wrapMode = new ImageAttributes())
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{
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wrapMode.SetWrapMode(WrapMode.TileFlipXY);
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graphic.DrawImage(image, rect, 0, 0, image.Width, image.Height, GraphicsUnit.Pixel, wrapMode);
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}
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//graphic.DrawImage(image, rect);
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}
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}
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else
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{
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thumbnail = new Bitmap(finalWidth, finalHeigth);
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using (var graphic = Graphics.FromImage(thumbnail))
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{
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if (!transparent)
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{
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graphic.Clear(Color.White);
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graphic.SmoothingMode = SmoothingMode.HighQuality;
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}
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graphic.InterpolationMode = InterpolationMode.HighQualityBicubic;
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graphic.PixelOffsetMode = PixelOffsetMode.HighQuality;
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graphic.DrawImage(image, 0, 0, finalWidth, finalHeigth);
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}
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}
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return thumbnail;
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}
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public static byte[] SaveToBytes(Image img)
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{
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using (var memoryStream = new MemoryStream())
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{
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img.Save(memoryStream, ImageFormat.Png);
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return memoryStream.ToArray();
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}
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}
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public static byte[] SaveToBytes(Image img, String formatName)
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{
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byte[] data;
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using (var memoryStream = new MemoryStream())
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{
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var encParams = new EncoderParameters(1);
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encParams.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, (long)100);
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img.Save(memoryStream, GetCodecInfo(formatName), encParams);
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data = memoryStream.ToArray();
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}
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return data;
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}
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public static ImageCodecInfo GetCodecInfo(String formatName)
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{
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var mimeType = string.Format("image/{0}", formatName);
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if (mimeType == "image/jpg") mimeType = "image/jpeg";
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var encoders = ImageCodecInfo.GetImageEncoders();
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foreach (var e in
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encoders.Where(e => e.MimeType.Equals(mimeType, StringComparison.InvariantCultureIgnoreCase)))
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{
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return e;
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}
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return 0 < encoders.Length ? encoders[0] : null;
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}
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public static string GetImgFormatName(ImageFormat format)
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{
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if (format.Equals(ImageFormat.Bmp)) return "bmp";
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if (format.Equals(ImageFormat.Emf)) return "emf";
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if (format.Equals(ImageFormat.Exif)) return "exif";
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if (format.Equals(ImageFormat.Gif)) return "gif";
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if (format.Equals(ImageFormat.Icon)) return "icon";
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if (format.Equals(ImageFormat.Jpeg)) return "jpeg";
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if (format.Equals(ImageFormat.Png)) return "png";
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if (format.Equals(ImageFormat.Tiff)) return "tiff";
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if (format.Equals(ImageFormat.Wmf)) return "wmf";
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return "jpg";
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}
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}
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}
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