update portable projects

Emby.Drawing.Net/ImageExtensions.cs

@@ -0,0 +1,217 @@
+using System;
+using System.Drawing;
+using System.Drawing.Drawing2D;
+using System.Drawing.Imaging;
+using System.IO;
+
+namespace Emby.Drawing.Net
+{
+    public static class ImageExtensions
+    {
+        /// <summary>
+        /// Saves the image.
+        /// </summary>
+        /// <param name="outputFormat">The output format.</param>
+        /// <param name="image">The image.</param>
+        /// <param name="toStream">To stream.</param>
+        /// <param name="quality">The quality.</param>
+        public static void Save(this Image image, ImageFormat outputFormat, Stream toStream, int quality)
+        {
+            // Use special save methods for jpeg and png that will result in a much higher quality image
+            // All other formats use the generic Image.Save
+            if (ImageFormat.Jpeg.Equals(outputFormat))
+            {
+                SaveAsJpeg(image, toStream, quality);
+            }
+            else if (ImageFormat.Png.Equals(outputFormat))
+            {
+                image.Save(toStream, ImageFormat.Png);
+            }
+            else
+            {
+                image.Save(toStream, outputFormat);
+            }
+        }
+
+        /// <summary>
+        /// Saves the JPEG.
+        /// </summary>
+        /// <param name="image">The image.</param>
+        /// <param name="target">The target.</param>
+        /// <param name="quality">The quality.</param>
+        public static void SaveAsJpeg(this Image image, Stream target, int quality)
+        {
+            using (var encoderParameters = new EncoderParameters(1))
+            {
+                encoderParameters.Param[0] = new EncoderParameter(Encoder.Quality, quality);
+                image.Save(target, GetImageCodecInfo("image/jpeg"), encoderParameters);
+            }
+        }
+
+        private static readonly ImageCodecInfo[] Encoders = ImageCodecInfo.GetImageEncoders();
+
+        /// <summary>
+        /// Gets the image codec info.
+        /// </summary>
+        /// <param name="mimeType">Type of the MIME.</param>
+        /// <returns>ImageCodecInfo.</returns>
+        private static ImageCodecInfo GetImageCodecInfo(string mimeType)
+        {
+            foreach (var encoder in Encoders)
+            {
+                if (string.Equals(encoder.MimeType, mimeType, StringComparison.OrdinalIgnoreCase))
+                {
+                    return encoder;
+                }
+            }
+
+            return Encoders.Length == 0 ? null : Encoders[0];
+        }
+
+        /// <summary>
+        /// Crops an image by removing whitespace and transparency from the edges
+        /// </summary>
+        /// <param name="bmp">The BMP.</param>
+        /// <returns>Bitmap.</returns>
+        /// <exception cref="System.Exception"></exception>
+        public static Bitmap CropWhitespace(this Bitmap bmp)
+        {
+            var width = bmp.Width;
+            var height = bmp.Height;
+
+            var topmost = 0;
+            for (int row = 0; row < height; ++row)
+            {
+                if (IsAllWhiteRow(bmp, row, width))
+                    topmost = row;
+                else break;
+            }
+
+            int bottommost = 0;
+            for (int row = height - 1; row >= 0; --row)
+            {
+                if (IsAllWhiteRow(bmp, row, width))
+                    bottommost = row;
+                else break;
+            }
+
+            int leftmost = 0, rightmost = 0;
+            for (int col = 0; col < width; ++col)
+            {
+                if (IsAllWhiteColumn(bmp, col, height))
+                    leftmost = col;
+                else
+                    break;
+            }
+
+            for (int col = width - 1; col >= 0; --col)
+            {
+                if (IsAllWhiteColumn(bmp, col, height))
+                    rightmost = col;
+                else
+                    break;
+            }
+
+            if (rightmost == 0) rightmost = width; // As reached left
+            if (bottommost == 0) bottommost = height; // As reached top.
+
+            var croppedWidth = rightmost - leftmost;
+            var croppedHeight = bottommost - topmost;
+
+            if (croppedWidth == 0) // No border on left or right
+            {
+                leftmost = 0;
+                croppedWidth = width;
+            }
+
+            if (croppedHeight == 0) // No border on top or bottom
+            {
+                topmost = 0;
+                croppedHeight = height;
+            }
+
+            // Graphics.FromImage will throw an exception if the PixelFormat is Indexed, so we need to handle that here
+            var thumbnail = new Bitmap(croppedWidth, croppedHeight, PixelFormat.Format32bppPArgb);
+
+            // Preserve the original resolution
+            TrySetResolution(thumbnail, bmp.HorizontalResolution, bmp.VerticalResolution);
+
+            using (var thumbnailGraph = Graphics.FromImage(thumbnail))
+            {
+                thumbnailGraph.CompositingQuality = CompositingQuality.HighQuality;
+                thumbnailGraph.SmoothingMode = SmoothingMode.HighQuality;
+                thumbnailGraph.InterpolationMode = InterpolationMode.HighQualityBicubic;
+                thumbnailGraph.PixelOffsetMode = PixelOffsetMode.HighQuality;
+                thumbnailGraph.CompositingMode = CompositingMode.SourceCopy;
+
+                thumbnailGraph.DrawImage(bmp,
+                  new RectangleF(0, 0, croppedWidth, croppedHeight),
+                  new RectangleF(leftmost, topmost, croppedWidth, croppedHeight),
+                  GraphicsUnit.Pixel);
+            }
+            return thumbnail;
+        }
+
+        /// <summary>
+        /// Tries the set resolution.
+        /// </summary>
+        /// <param name="bmp">The BMP.</param>
+        /// <param name="x">The x.</param>
+        /// <param name="y">The y.</param>
+        private static void TrySetResolution(Bitmap bmp, float x, float y)
+        {
+            if (x > 0 && y > 0)
+            {
+                bmp.SetResolution(x, y);
+            }
+        }
+
+        /// <summary>
+        /// Determines whether or not a row of pixels is all whitespace
+        /// </summary>
+        /// <param name="bmp">The BMP.</param>
+        /// <param name="row">The row.</param>
+        /// <param name="width">The width.</param>
+        /// <returns><c>true</c> if [is all white row] [the specified BMP]; otherwise, <c>false</c>.</returns>
+        private static bool IsAllWhiteRow(Bitmap bmp, int row, int width)
+        {
+            for (var i = 0; i < width; ++i)
+            {
+                if (!IsWhiteSpace(bmp.GetPixel(i, row)))
+                {
+                    return false;
+                }
+            }
+            return true;
+        }
+
+        /// <summary>
+        /// Determines whether or not a column of pixels is all whitespace
+        /// </summary>
+        /// <param name="bmp">The BMP.</param>
+        /// <param name="col">The col.</param>
+        /// <param name="height">The height.</param>
+        /// <returns><c>true</c> if [is all white column] [the specified BMP]; otherwise, <c>false</c>.</returns>
+        private static bool IsAllWhiteColumn(Bitmap bmp, int col, int height)
+        {
+            for (var i = 0; i < height; ++i)
+            {
+                if (!IsWhiteSpace(bmp.GetPixel(col, i)))
+                {
+                    return false;
+                }
+            }
+            return true;
+        }
+
+        /// <summary>
+        /// Determines if a color is whitespace
+        /// </summary>
+        /// <param name="color">The color.</param>
+        /// <returns><c>true</c> if [is white space] [the specified color]; otherwise, <c>false</c>.</returns>
+        private static bool IsWhiteSpace(Color color)
+        {
+            return (color.R == 255 && color.G == 255 && color.B == 255) || color.A == 0;
+        }
+    }
+}