// // FilterPng.cs // // Copyright (C) 2004 Novell, Inc. // // // Permission is hereby granted, free of charge, to any person obtaining a // copy of this software and associated documentation files (the "Software"), // to deal in the Software without restriction, including without limitation // the rights to use, copy, modify, merge, publish, distribute, sublicense, // and/or sell copies of the Software, and to permit persons to whom the // Software is furnished to do so, subject to the following conditions: // // The above copyright notice and this permission notice shall be included in // all copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER // DEALINGS IN THE SOFTWARE. // using System; using System.IO; using Beagle.Util; using Beagle.Daemon; using SemWeb; namespace Beagle.Filters { public class FilterPng : FilterImage { public FilterPng () : base () { AddSupportedFlavor (FilterFlavor.NewFromMimeType ("image/png")); } protected override void PullImageProperties () { PngHeader png = new PngHeader (Stream); foreach (PngHeader.Chunk chunk in png.Chunks){ if (chunk is PngHeader.IhdrChunk) { PngHeader.IhdrChunk ihdr = (PngHeader.IhdrChunk)chunk; Width = (int)ihdr.Width; Height = (int)ihdr.Height; Depth = ihdr.Depth; bool hasAlpha = false; string colorType = null; switch (ihdr.Color) { case PngHeader.ColorType.Gray: colorType = "Greyscale"; hasAlpha = false; break; case PngHeader.ColorType.Rgb: colorType = "Truecolor"; hasAlpha = false; break; case PngHeader.ColorType.Indexed: colorType = "Indexed"; hasAlpha = false; break; case PngHeader.ColorType.GrayAlpha: colorType = "Greyscale"; hasAlpha = true; break; case PngHeader.ColorType.RgbAlpha: colorType = "Truecolor"; hasAlpha = true; break; } AddProperty (Beagle.Property.NewUnsearched ("fixme:colortype", colorType)); AddProperty (Beagle.Property.NewBool ("fixme:hasalpha", hasAlpha)); } else if (chunk is PngHeader.TextChunk) { ExtractTextProperty ((PngHeader.TextChunk) chunk); } } Finished (); } private void ExtractTextProperty (PngHeader.TextChunk tchunk) { switch (tchunk.Keyword) { case "Title": AddProperty (Beagle.Property.New ("dc:title", tchunk.Text)); break; case "Author": AddProperty (Beagle.Property.New ("dc:creator", tchunk.Text)); break; case "Copyright": AddProperty (Beagle.Property.New ("dc:rights", tchunk.Text)); break; case "Description": AddProperty (Beagle.Property.New ("png:description", tchunk.Text)); break; case "Comment": AddProperty (Beagle.Property.New ("png:comment", tchunk.Text)); break; case "XMP": case "XML:com.adobe.xmp": XmpFile xmp = new XmpFile (new MemoryStream (tchunk.TextData)); AddXmpProperties (xmp); break; case "Disclaimer": case "Warning": case "Source": case "Creation Time": case "Software": break; } } } }