/// <summary>
/// Creates an Animated PNG from a Image.
/// </summary>
/// <returns>The file.</returns>
/// <param name="image">Image.</param>
public static APNG FromImage(Image image)
{
APNG apng = new APNG();
apng.Load(APNG.ImageToStream(image));
return(apng);
}
/// <summary>
/// Creates an Animated PNG from a file.
/// </summary>
/// <returns>The file.</returns>
/// <param name="filename">Filename.</param>
public static APNG FromFile(string filename)
{
APNG apng = new APNG();
apng.Load(filename);
return(apng);
}
/// <summary>
/// Creates an Animated PNG from a stream.
/// </summary>
/// <returns>The file.</returns>
/// <param name="stream">The stream.</param>
public static APNG FromStream(MemoryStream stream)
{
APNG apng = new APNG();
apng.Load(stream);
return(apng);
}
/// <summary>
/// Adds an image as the next frame.
/// </summary>
/// <param name="image">Png frame.</param>
public void AddFrame(Image image)
{
//TODO: Handle different sizes
//Temporarily reject improper sizes.
if (IHDRChunk != null && (image.Width > IHDRChunk.Width || image.Height > IHDRChunk.Height))
{
throw new InvalidDataException("Frame must be less than or equal to the size of the other frames.");
}
APNG apng = APNG.FromImage(image);
if (IHDRChunk == null)
{
IHDRChunk = apng.IHDRChunk;
}
//Create acTL Chunk.
if (acTLChunk == null)
{
acTLChunk = new acTLChunk();
acTLChunk.PlayCount = 0;
}
uint sequenceNumber = (frames.Count == 0) ? 0 : (uint)(frames[frames.Count - 1].fcTLChunk.SequenceNumber + frames[frames.Count - 1].IDATChunks.Count);
//Create fcTL Chunk
fcTLChunk fctl = new fcTLChunk
{
SequenceNumber = sequenceNumber,
Width = (uint)image.Width,
Height = (uint)image.Height,
XOffset = 0,
YOffset = 0,
DelayNumerator = 100,
DelayDenominator = 1000,
DisposeOp = DisposeOps.APNGDisposeOpNone,
BlendOp = BlendOps.APNGBlendOpSource
};
//Set the default image if needed.
if (defaultImage.IDATChunks.Count == 0)
{
defaultImage = apng.DefaultImage;
defaultImage.fcTLChunk = fctl;
DefaultImageIsAnimated = true;
}
//Add all the frames from the png.
if (apng.IsSimplePNG)
{
Frame frame = apng.DefaultImage;
frame.fcTLChunk = fctl;
foreach (OtherChunk chunk in frame.OtherChunks)
{
if (!defaultImage.OtherChunks.Contains(chunk))
{
defaultImage.OtherChunks.Add(chunk);
}
}
frame.OtherChunks.Clear();
frames.Add(frame);
}
else
{
for (int i = 0; i < apng.FrameCount; ++i)
{
Frame frame = apng.Frames[i];
frame.fcTLChunk.SequenceNumber = sequenceNumber;
foreach (OtherChunk chunk in frame.OtherChunks)
{
if (!defaultImage.OtherChunks.Contains(chunk))
{
defaultImage.OtherChunks.Add(chunk);
}
}
frame.OtherChunks.Clear();
frames.Add(frame);
}
}
List <OtherChunk> otherChunks = defaultImage.OtherChunks;
// Now we should apply every chunk in otherChunks to every frame.
if (defaultImage != frames[0])
{
frames.ForEach(f => otherChunks.ForEach(f.AddOtherChunk));
}
else
{
for (int i = 1; i < frames.Count; ++i)
{
otherChunks.ForEach(frames[i].AddOtherChunk);
}
}
acTLChunk.FrameCount = (uint)frames.Count;
}