public void LoadGifPicture(Image img, GIFQuality quality)
{
List <byte> dataList;
using (MemoryStream ms = new MemoryStream())
{
img.SaveGIF(ms, quality);
dataList = new List <byte>(ms.ToArray());
}
if (!AnalyzeGifSignature(dataList))
{
throw new Exception("File is not a gif!");
}
AnalyzeScreenDescriptor(dataList);
GIFBlockType blockType = GetTypeOfNextBlock(dataList);
while (blockType != GIFBlockType.Trailer)
{
switch (blockType)
{
case GIFBlockType.ImageDescriptor:
AnalyzeImageDescriptor(dataList);
break;
case GIFBlockType.Extension:
ThrowAwayExtensionBlock(dataList);
break;
}
blockType = GetTypeOfNextBlock(dataList);
}
}
public void LoadGifPicture(MemoryStream stream)
{
//TODO: Eliminate double copying
List <byte> dataList = new List <byte>(stream.ToArray()); //Copies the data *again* grr.
if (!AnalyzeGifSignature(dataList))
{
throw (new Exception("File is not a gif!"));
}
AnalyzeScreenDescriptor(dataList);
GIFBlockType blockType = GetTypeOfNextBlock(dataList);
while (blockType != GIFBlockType.Trailer)
{
switch (blockType)
{
case GIFBlockType.ImageDescriptor:
AnalyzeImageDescriptor(dataList);
break;
case GIFBlockType.Extension:
ThrowAwayExtensionBlock(dataList);
break;
default:
break;
}
blockType = GetTypeOfNextBlock(dataList);
}
}
public void LoadGifPicture(Bitmap gifPicture)
{
MemoryStream stream = new MemoryStream();
m_Image = gifPicture;
m_Image.Save(stream, ImageFormat.Gif);
List <byte> dataList = new List <byte>(stream.ToArray());
if (!AnalyzeGifSignature(dataList))
{
throw (new Exception("File is not a gif!"));
}
AnalyzeScreenDescriptor(dataList);
GIFBlockType blockType = GetTypeOfNextBlock(dataList);
while (blockType != GIFBlockType.Trailer)
{
switch (blockType)
{
case GIFBlockType.ImageDescriptor:
AnalyzeImageDescriptor(dataList);
break;
case GIFBlockType.Extension:
ThrowAwayExtensionBlock(dataList);
break;
default:
break;
}
blockType = GetTypeOfNextBlock(dataList);
}
}
private GIFBlockType GetTypeOfNextBlock(List <byte> gifData)
{
GIFBlockType blockType = (GIFBlockType)gifData[0];
return(blockType);
}
