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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
namespace Tango.AnimatedGif.Decoding
{
// label 0x01
internal class GifPlainTextExtension : GifExtension
{
internal const int ExtensionLabel = 0x01;
public int BlockSize { get; private set; }
public int Left { get; private set; }
public int Top { get; private set; }
public int Width { get; private set; }
public int Height { get; private set; }
public int CellWidth { get; private set; }
public int CellHeight { get; private set; }
public int ForegroundColorIndex { get; private set; }
public int BackgroundColorIndex { get; private set; }
public string Text { get; private set; }
public IList<GifExtension> Extensions { get; private set; }
private GifPlainTextExtension()
{
}
internal override GifBlockKind Kind
{
get { return GifBlockKind.GraphicRendering; }
}
internal static GifPlainTextExtension ReadPlainText(Stream stream, IEnumerable<GifExtension> controlExtensions, bool metadataOnly)
{
var plainText = new GifPlainTextExtension();
plainText.Read(stream, controlExtensions, metadataOnly);
return plainText;
}
private void Read(Stream stream, IEnumerable<GifExtension> controlExtensions, bool metadataOnly)
{
// Note: at this point, the label (0x01) has already been read
byte[] bytes = new byte[13];
stream.ReadAll(bytes,0, bytes.Length);
BlockSize = bytes[0];
if (BlockSize != 12)
throw GifHelpers.InvalidBlockSizeException("Plain Text Extension", 12, BlockSize);
Left = BitConverter.ToUInt16(bytes, 1);
Top = BitConverter.ToUInt16(bytes, 3);
Width = BitConverter.ToUInt16(bytes, 5);
Height = BitConverter.ToUInt16(bytes, 7);
CellWidth = bytes[9];
CellHeight = bytes[10];
ForegroundColorIndex = bytes[11];
BackgroundColorIndex = bytes[12];
var dataBytes = GifHelpers.ReadDataBlocks(stream, metadataOnly);
Text = Encoding.ASCII.GetString(dataBytes);
Extensions = controlExtensions.ToList().AsReadOnly();
}
}
}
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