public PngWriter(Stream outputStream, ImageInfo imgInfo, string filename)
{
this.filename = ((filename == null) ? "" : filename);
this.outputStream = outputStream;
ImgInfo = imgInfo;
CompLevel = 6;
ShouldCloseStream = true;
IdatMaxSize = 0;
CompressionStrategy = EDeflateCompressStrategy.Filtered;
rowb = new byte[imgInfo.BytesPerRow + 1];
rowbprev = new byte[rowb.Length];
rowbfilter = new byte[rowb.Length];
chunksList = new ChunksListForWrite(ImgInfo);
metadata = new PngMetadata(chunksList);
filterStrat = new FilterWriteStrategy(ImgInfo, FilterType.FILTER_DEFAULT);
unpackedMode = false;
needsPack = (unpackedMode && imgInfo.Packed);
}
public PngWriter( Stream outputStream, ImageInfo imgInfo,
String filename )
{
this.filename = ( filename == null ) ? "" : filename;
this.outputStream = outputStream;
this.ImgInfo = imgInfo;
this.CompLevel = 6;
this.ShouldCloseStream = true;
this.IdatMaxSize = 0;
this.CompressionStrategy = EDeflateCompressStrategy.Filtered;
rowb = new byte [ imgInfo.BytesPerRow + 1 ];
rowbprev = new byte [ rowb.Length ];
rowbfilter = new byte [ rowb.Length ];
chunksList = new ChunksListForWrite ( ImgInfo );
metadata = new PngMetadata ( chunksList );
filterStrat = new FilterWriteStrategy ( ImgInfo, FilterType.FILTER_DEFAULT );
unpackedMode = false;
needsPack = unpackedMode && imgInfo.Packed;
}
/// <summary>
/// Constructs a PngWriter from a outputStream, with optional filename or description
/// </summary>
/// <remarks>
/// After construction nothing is writen yet. You still can set some
/// parameters (compression, filters) and queue chunks before start writing the pixels.
///
/// See also <c>FileHelper.createPngWriter()</c>
/// </remarks>
/// <param name="outputStream">Opened stream for binary writing</param>
/// <param name="imgInfo">Basic image parameters</param>
/// <param name="filename">Optional, can be the filename or a description.</param>
public PngWriter(Stream outputStream, ImageInfo imgInfo,
String filename) {
this.filename = filename == null ? "" : filename;
this.outputStream = outputStream;
ImgInfo = imgInfo;
// defaults settings
CompLevel = 6;
ShouldCloseStream = true;
IdatMaxSize = 0; // use default
CompressionStrategy = EDeflateCompressStrategy.Filtered;
// prealloc
//scanline = new int[imgInfo.SamplesPerRowPacked];
rowb = new byte[imgInfo.BytesPerRow + 1];
rowbprev = new byte[rowb.Length];
rowbfilter = new byte[rowb.Length];
chunksList = new ChunksListForWrite(ImgInfo);
metadata = new PngMetadata(chunksList);
filterStrat = new FilterWriteStrategy(ImgInfo, FilterType.FILTER_DEFAULT);
unpackedMode = false;
needsPack = unpackedMode && imgInfo.Packed;
}
public void SetFilterType( FilterType filterType )
{
filterStrat = new FilterWriteStrategy ( ImgInfo, filterType );
}
/// <summary>
/// Sets internal prediction filter type, or strategy to choose it.
/// </summary>
/// <remarks>
/// This must be called just after constructor, before starting writing.
///
/// Recommended values: DEFAULT (default) or AGGRESIVE
/// </remarks>
/// <param name="filterType">One of the five prediction types or strategy to choose it</param>
public void SetFilterType(FilterType filterType)
{
filterStrat = new FilterWriteStrategy(ImgInfo, filterType);
}