Resize image to fit : Image « 2D Graphics « C# / C Sharp
Resize image to fit
//-----------------------------------------------------------------------
// <copyright file="ImageUtilities.cs" company="LAN Lordz, inc.">
// Copyright 2010 LAN Lordz, inc.
//
// This file is part of The LAN Lordz LAN Party System.
//
// The LAN Lordz LAN Party System is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The LAN Lordz LAN Party System is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with The LAN Lordz LAN Party System. If not, see [http://www.gnu.org/licenses/].
// </copyright>
// <author>John Gietzen</author>
//-----------------------------------------------------------------------
namespace LanLordz.SiteTools
{
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
public static class ImageUtilities
{
public static byte[] ResizeToFit(byte[] imageData, Size size, bool expand)
{
try
{
using (MemoryStream ms = new MemoryStream(imageData))
{
using (Image img = Image.FromStream(ms))
{
if (size.Width == img.Width &&
size.Height == img.Height)
{
return imageData;
}
var width = (float)size.Width;
var height = (float)size.Height;
var xRatio = width / img.Width;
var yRatio = height / img.Height;
var ratio = Math.Min(xRatio, yRatio);
// If we are not expanding the image to fit and the resulting ratio indicates expansion, do not transform the image.
if (!expand && ratio >= 1.0f)
{
return imageData;
}
var newSize = new Size(Math.Min(size.Width, (int)Math.Round(img.Width * ratio, MidpointRounding.AwayFromZero)), Math.Min(size.Height, (int)Math.Round(img.Height * ratio, MidpointRounding.AwayFromZero)));
// Invialidate internally stored thumbnails.
img.RotateFlip(System.Drawing.RotateFlipType.Rotate180FlipNone);
img.RotateFlip(System.Drawing.RotateFlipType.Rotate180FlipNone);
var newImage = new Bitmap(newSize.Width, newSize.Height);
using (var g = Graphics.FromImage(newImage))
{
g.SmoothingMode = SmoothingMode.HighQuality;
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.PixelOffsetMode = PixelOffsetMode.HighQuality;
g.DrawImage(img, new Rectangle(new Point(0, 0), newSize));
}
using (MemoryStream outStream = new MemoryStream(1024))
{
newImage.Save(outStream, ImageFormat.Jpeg);
return outStream.ToArray();
}
}
}
}
catch
{
return imageData;
}
}
public static string GetImageMimeType(byte[] imageData)
{
String mimeType = "image/unknown";
try
{
Guid id;
using (MemoryStream ms = new MemoryStream(imageData))
{
using (Image img = Image.FromStream(ms))
{
id = img.RawFormat.Guid;
}
}
if (id == ImageFormat.Png.Guid)
{
mimeType = "image/png";
}
else if (id == ImageFormat.Bmp.Guid)
{
mimeType = "image/bmp";
}
else if (id == ImageFormat.Emf.Guid)
{
mimeType = "image/x-emf";
}
else if (id == ImageFormat.Exif.Guid)
{
mimeType = "image/jpeg";
}
else if (id == ImageFormat.Gif.Guid)
{
mimeType = "image/gif";
}
else if (id == ImageFormat.Icon.Guid)
{
mimeType = "image/ico";
}
else if (id == ImageFormat.Jpeg.Guid)
{
mimeType = "image/jpeg";
}
else if (id == ImageFormat.MemoryBmp.Guid)
{
mimeType = "image/bmp";
}
else if (id == ImageFormat.Tiff.Guid)
{
mimeType = "image/tiff";
}
else if (id == ImageFormat.Wmf.Guid)
{
mimeType = "image/wmf";
}
}
catch
{
}
return mimeType;
}
}
}
