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Merge pull request #598 from telerik/dess-sixlabors-image-sharp
Update create-custom-image-properties-resolver-net-standard.md
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‎knowledge-base/create-custom-image-properties-resolver-net-standard.md

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<td>RadPdfProcessing</td>
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<td><a href="https://www.telerik.com/blogs/author/yoan-karamanov">Yoan Karamanov</a></td>
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</tr>
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<tr>
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<td>2.0.0*</td>
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<td>SixLabors.ImageSharp</td>
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<td>-</td>
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</tr>
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</tbody>
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</table>
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@@ -34,158 +39,161 @@ res_type: kb
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## Solution
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The following code snippets demonstrates how to create a custom implementation of the ImagePropertiesResolver abstract class using the [SixLabors.ImageSharp](https://github.com/SixLabors/ImageSharp) library and set it to the ImagePropertiesResolver property of the FixedExtensibilityManager.
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The following code snippets demonstrate how to create a custom implementation of the ImagePropertiesResolver abstract class using the [SixLabors.ImageSharp](https://github.com/SixLabors/ImageSharp) (2.0.0) library and set it to the **ImagePropertiesResolver** property of the **FixedExtensibilityManager**.
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#### __[C#] Create a custom implementation inheriting the ImagePropertiesResolverBase abstract class__
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{{region kb-create-custom-image-properties-resolver1}}
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```csharp
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public class ImagePropertiesResolver : ImagePropertiesResolverBase
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public class ImagePropertiesResolver : ImagePropertiesResolverBase
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{
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public override Telerik.Documents.Primitives.Size GetImageSize(byte[] imageData)
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{
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public override Telerik.Documents.Primitives.Size GetImageSize(byte[] imageData)
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var size = Telerik.Documents.Primitives.Size.Empty;
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try
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{
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var size = Telerik.Documents.Primitives.Size.Empty;
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try
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using (SixLabors.ImageSharp.Image image = SixLabors.ImageSharp.Image.Load(imageData))
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{
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using (ImageSharp image = ImageSharp.Load(imageData))
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{
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size = new Telerik.Documents.Primitives.Size(image.Width, image.Height);
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}
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size = new Telerik.Documents.Primitives.Size(image.Width, image.Height);
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}
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catch (UnknownImageFormatException ex)
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{
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// Image format not recognized.
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throw new NotSupportedException("Unsupported image format.", ex);
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}
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return size;
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}
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public override bool TryGetRawImageData(byte[] imageData, out byte[] rawRgbData, out byte[] rawAlpha, out Telerik.Documents.Primitives.Size size)
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catch (SixLabors.ImageSharp.UnknownImageFormatException ex)
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{
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try
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{
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IImageFormat imageFormat;
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using (ImageSharp image = ImageSharp.Load(imageData, out imageFormat))
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{
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size = new Telerik.Documents.Primitives.Size(image.Width, image.Height);
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IImageDecoder decoder = null;
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Dictionary<Type, Action> decoderSwitch = new Dictionary<Type, Action>
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{
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{ typeof(PngFormat), () => decoder = new PngDecoder() },
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{ typeof(BmpFormat), () => decoder = new BmpDecoder() },
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{ typeof(GifFormat), () => decoder = new GifDecoder() },
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{ typeof(JpegFormat), () => decoder = new JpegDecoder() },
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{ typeof(PbmFormat), () => decoder = new PbmDecoder() },
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{ typeof(TgaFormat), () => decoder = new TgaDecoder() },
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{ typeof(TiffFormat), () => decoder = new TiffDecoder() },
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{ typeof(WebpFormat), () => decoder = new WebpDecoder() },
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};
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if (decoderSwitch.ContainsKey(imageFormat.GetType()))
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{
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decoderSwitch[imageFormat.GetType()]();
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}
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else
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{
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rawRgbData = null;
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rawAlpha = null;
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return false;
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}
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// Image format not recognized.
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throw new NotSupportedException("Unsupported image format.", ex);
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}
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Configuration configuration = new Configuration();
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ImageSharp decodedImage = decoder.Decode(configuration, new MemoryStream(imageData));
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return size;
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}
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ImageFrame frame = decodedImage.Frames[0];
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public override bool TryGetRawImageData(byte[] imageData, out byte[] rawRgbData, out byte[] rawAlpha, out Telerik.Documents.Primitives.Size size)
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{
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try
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{
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IImageFormat imageFormat;
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using (SixLabors.ImageSharp.Image image = SixLabors.ImageSharp.Image.Load(imageData, out imageFormat))
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{
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size = new Telerik.Documents.Primitives.Size(image.Width, image.Height);
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ImageFrame<Rgb24> frameRgb24 = frame as ImageFrame<Rgb24>;
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if (frameRgb24 != null)
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IImageDecoder decoder = null;
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Dictionary<Type, Action> decoderSwitch = new Dictionary<Type, Action>
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{
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GetRawDataFromRgbSource(frameRgb24, out rawRgbData);
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rawAlpha = null;
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{ typeof(PngFormat), () => decoder = new PngDecoder() },
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{ typeof(BmpFormat), () => decoder = new BmpDecoder() },
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{ typeof(GifFormat), () => decoder = new GifDecoder() },
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{ typeof(JpegFormat), () => decoder = new JpegDecoder() },
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{ typeof(PbmFormat), () => decoder = new PbmDecoder() },
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{ typeof(TgaFormat), () => decoder = new TgaDecoder() },
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{ typeof(TiffFormat), () => decoder = new TiffDecoder() },
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{ typeof(WebpFormat), () => decoder = new WebpDecoder() },
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};
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if (decoderSwitch.ContainsKey(imageFormat.GetType()))
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{
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decoderSwitch[imageFormat.GetType()]();
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}
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else
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{
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rawRgbData = null;
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rawAlpha = null;
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return true;
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}
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return false;
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}
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ImageFrame<Rgba32> frameRgba32 = frame as ImageFrame<Rgba32>;
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if (frameRgba32 != null)
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{
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GetRawDataFromRgbaSource(frameRgba32, out rawRgbData, out rawAlpha);
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SixLabors.ImageSharp.Configuration configuration = new SixLabors.ImageSharp.Configuration();
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SixLabors.ImageSharp.Image decodedImage = decoder.Decode(configuration, new MemoryStream(imageData));
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return true;
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}
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SixLabors.ImageSharp.ImageFrame frame = decodedImage.Frames[0];
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throw new NotSupportedException("Not supported image pixel format.");
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}
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}
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catch (Exception ex)
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{
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if (ex is UnknownImageFormatException || ex is ImageProcessingException)
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SixLabors.ImageSharp.ImageFrame<Rgb24> frameRgb24 = frame as SixLabors.ImageSharp.ImageFrame<Rgb24>;
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if (frameRgb24 != null)
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{
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rawRgbData = null;
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GetRawDataFromRgbSource(frameRgb24, out rawRgbData);
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rawAlpha = null;
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size = new Telerik.Documents.Primitives.Size();
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return false;
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return true;
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}
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else
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SixLabors.ImageSharp.ImageFrame<Rgba32> frameRgba32 = frame as SixLabors.ImageSharp.ImageFrame<Rgba32>;
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if (frameRgba32 != null)
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{
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throw ex;
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GetRawDataFromRgbaSource(frameRgba32, out rawRgbData, out rawAlpha);
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return true;
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}
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throw new NotSupportedException("Not supported image pixel format.");
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}
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}
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private static void GetRawDataFromRgbSource(ImageFrame<Rgb24> source, out byte[] data)
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catch (Exception ex)
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{
142-
byte[] pixels = new byte[source.PixelBuffer.Width * source.PixelBuffer.Height * 3];
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Span<byte> span = new Span<byte>(pixels);
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source.CopyPixelDataTo(span);
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data = span.ToArray();
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if (ex is SixLabors.ImageSharp.UnknownImageFormatException || ex is SixLabors.ImageSharp.ImageProcessingException)
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{
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rawRgbData = null;
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rawAlpha = null;
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size = new Telerik.Documents.Primitives.Size();
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return false;
137+
}
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else
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{
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throw ex;
141+
}
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}
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}
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148-
private static void GetRawDataFromRgbaSource(ImageFrame<Rgba32> source, out byte[] data, out byte[] alpha)
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{
150-
byte[] pixels = new byte[source.PixelBuffer.Width * source.PixelBuffer.Height * 4];
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Span<byte> span = new Span<byte>(pixels);
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source.CopyPixelDataTo(span);
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private static void GetRawDataFromRgbSource(SixLabors.ImageSharp.ImageFrame<Rgb24> source, out byte[] data)
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{
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byte[] pixels = new byte[source.PixelBuffer.Width * source.PixelBuffer.Height * 3];
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Span<byte> span = new Span<byte>(pixels);
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source.CopyPixelDataTo(span);
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data = span.ToArray();
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}
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data = new byte[source.PixelBuffer.Width * source.PixelBuffer.Height * 3];
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alpha = new byte[source.PixelBuffer.Width * source.PixelBuffer.Height];
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bool shouldExportAlpha = false;
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private static void GetRawDataFromRgbaSource(SixLabors.ImageSharp.ImageFrame<Rgba32> source, out byte[] data, out byte[] alpha)
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{
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byte[] pixels = new byte[source.PixelBuffer.Width * source.PixelBuffer.Height * 4];
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Span<byte> span = new Span<byte>(pixels);
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source.CopyPixelDataTo(span);
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for (int i = 0; i < pixels.Length; i += 4)
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{
160-
byte r = pixels[i];
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byte g = pixels[i + 1];
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byte b = pixels[i + 2];
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byte a = pixels[i + 3];
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data = new byte[source.PixelBuffer.Width * source.PixelBuffer.Height * 3];
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alpha = new byte[source.PixelBuffer.Width * source.PixelBuffer.Height];
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bool shouldExportAlpha = false;
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data[3 * i / 4] = r;
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data[3 * i / 4 + 1] = g;
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data[3 * i / 4 + 2] = b;
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alpha[i / 4] = a;
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for (int i = 0; i < pixels.Length; i += 4)
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{
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byte r = pixels[i];
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byte g = pixels[i + 1];
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byte b = pixels[i + 2];
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byte a = pixels[i + 3];
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170-
if (a != 255)
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{
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shouldExportAlpha = true;
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}
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}
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data[3 * i / 4] = r;
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data[3 * i / 4 + 1] = g;
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data[3 * i / 4 + 2] = b;
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alpha[i / 4] = a;
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176-
if (!shouldExportAlpha)
175+
if (a != 255)
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{
178-
alpha = null;
177+
shouldExportAlpha = true;
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}
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}
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if (!shouldExportAlpha)
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{
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alpha = null;
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}
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}
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183-
{{endregion}}
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```
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#### __[C#] Set the custom implementation to the ImagePropertiesResolver property of the FixedExtensibilityManager__
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{{region kb-create-custom-image-properties-resolver2}}
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```csharp
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ImagePropertiesResolver customImagePropertiesResolver = new ImagePropertiesResolver();
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FixedExtensibilityManager.ImagePropertiesResolver = customImagePropertiesResolver;
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{{endregion}}
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```
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## See Also
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- [Cross-Platform Images Support in PdfProcessing]({%slug radpdfprocessing-cross-platform-images%})

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