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//
// 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;
}
}
}
}
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