using MediaBrowser.Controller.Entities;
using MediaBrowser.Model.Entities;
using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
namespace MediaBrowser.Controller.Drawing
{
public static class ImageProcessor
{
///
/// Processes an image by resizing to target dimensions
///
/// The entity that owns the image
/// The image type
/// The image index (currently only used with backdrops)
/// The stream to save the new image to
/// Use if a fixed width is required. Aspect ratio will be preserved.
/// Use if a fixed height is required. Aspect ratio will be preserved.
/// Use if a max width is required. Aspect ratio will be preserved.
/// Use if a max height is required. Aspect ratio will be preserved.
/// Quality level, from 0-100. Currently only applies to JPG. The default value should suffice.
public static void ProcessImage(BaseEntity entity, ImageType imageType, int imageIndex, Stream toStream, int? width, int? height, int? maxWidth, int? maxHeight, int? quality)
{
Image originalImage = Image.FromFile(GetImagePath(entity, imageType, imageIndex));
// Determine the output size based on incoming parameters
Size newSize = DrawingUtils.Resize(originalImage.Size, width, height, maxWidth, maxHeight);
Bitmap thumbnail;
// Graphics.FromImage will throw an exception if the PixelFormat is Indexed, so we need to handle that here
if (originalImage.PixelFormat.HasFlag(PixelFormat.Indexed))
{
thumbnail = new Bitmap(originalImage, newSize.Width, newSize.Height);
}
else
{
thumbnail = new Bitmap(newSize.Width, newSize.Height, originalImage.PixelFormat);
}
thumbnail.MakeTransparent();
// Preserve the original resolution
thumbnail.SetResolution(originalImage.HorizontalResolution, originalImage.VerticalResolution);
Graphics thumbnailGraph = Graphics.FromImage(thumbnail);
thumbnailGraph.CompositingQuality = CompositingQuality.HighQuality;
thumbnailGraph.SmoothingMode = SmoothingMode.HighQuality;
thumbnailGraph.InterpolationMode = InterpolationMode.HighQualityBicubic;
thumbnailGraph.PixelOffsetMode = PixelOffsetMode.HighQuality;
thumbnailGraph.CompositingMode = CompositingMode.SourceOver;
thumbnailGraph.DrawImage(originalImage, 0, 0, newSize.Width, newSize.Height);
ImageFormat outputFormat = originalImage.RawFormat;
// Write to the output stream
SaveImage(outputFormat, thumbnail, toStream, quality);
thumbnailGraph.Dispose();
thumbnail.Dispose();
originalImage.Dispose();
}
public static string GetImagePath(BaseEntity entity, ImageType imageType, int imageIndex)
{
var item = entity as BaseItem;
if (item != null)
{
if (imageType == ImageType.Logo)
{
return item.LogoImagePath;
}
if (imageType == ImageType.Backdrop)
{
return item.BackdropImagePaths.ElementAt(imageIndex);
}
if (imageType == ImageType.Banner)
{
return item.BannerImagePath;
}
if (imageType == ImageType.Art)
{
return item.ArtImagePath;
}
if (imageType == ImageType.Thumbnail)
{
return item.ThumbnailImagePath;
}
}
return entity.PrimaryImagePath;
}
public static void SaveImage(ImageFormat outputFormat, Image newImage, 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))
{
SaveJpeg(newImage, toStream, quality);
}
else if (ImageFormat.Png.Equals(outputFormat))
{
newImage.Save(toStream, ImageFormat.Png);
}
else
{
newImage.Save(toStream, outputFormat);
}
}
public static void SaveJpeg(Image image, Stream target, int? quality)
{
if (!quality.HasValue)
{
quality = 90;
}
using (var encoderParameters = new EncoderParameters(1))
{
encoderParameters.Param[0] = new EncoderParameter(Encoder.Quality, quality.Value);
image.Save(target, GetImageCodecInfo("image/jpeg"), encoderParameters);
}
}
public static ImageCodecInfo GetImageCodecInfo(string mimeType)
{
ImageCodecInfo[] info = ImageCodecInfo.GetImageEncoders();
for (int i = 0; i < info.Length; i++)
{
ImageCodecInfo ici = info[i];
if (ici.MimeType.Equals(mimeType, StringComparison.OrdinalIgnoreCase))
{
return ici;
}
}
return info[1];
}
}
}