public Fctl(Ihdr ihdr, UInt32 frame, UInt32 x, UInt32 y, UInt32 width, UInt32 height, Rational delay, ApngDisposeOperation disposeOp, ApngBlendOperation blendOp)
: base(ChunkType.fcTL)
{
#region sanity
if(width == 0)
throw new ArgumentOutOfRangeException("width", "width must be > 0");
if(height == 0)
throw new ArgumentOutOfRangeException("height", "height must be > 0");
if(x + width > ihdr.Width)
throw new ArgumentException("x + width(" + (x + (UInt64)width) + ") must be smaller than canvas width: " + ihdr.Width);
if(y + height > ihdr.Height)
throw new ArgumentException("y + height(" + (y + (UInt64)height) + ") must be smaller than canvas height: " + ihdr.Height);
#endregion
_frame = frame;
_x = x;
_y = y;
_width = width;
_height = height;
_delay = delay;
_disposeOp = disposeOp;
_blendOp = blendOp;
_memStream.Write(NoHelper.GetBytes(_frame), 0, 4);
_memStream.Write(NoHelper.GetBytes(_width), 0, 4);
_memStream.Write(NoHelper.GetBytes(_height), 0, 4);
_memStream.Write(NoHelper.GetBytes(_x), 0, 4);
_memStream.Write(NoHelper.GetBytes(_y), 0, 4);
_memStream.Write(NoHelper.GetBytes(delay.Numerator), 0, 2);
_memStream.Write(NoHelper.GetBytes(delay.Denominator), 0, 2);
_memStream.WriteByte((Byte)disposeOp);
_memStream.WriteByte((Byte)blendOp);
}
//read http://stackoverflow.com/questions/6216094/implementing-the-apng-render-function
public Tuple<Fctl, Fdat> EncodeFrame(Ihdr ihdr, InternalImage img, uint sequenceNumber, InternalImage lastImage, Rational delay)
{
//Rectangle bb = CalculateDifferenceBoundingBox(img, lastImage);
//float approxns = ApproximateCompressionSize(img, lastImage, bb, ApngDisposeOperation.None, ApngBlendOperation.Source);
//float approxns = ApproximateCompressionSize(img, lastImage, bb, ApngDisposeOperation., ApngBlendOperation.Source);
return new Tuple<Fctl, Fdat>(new Fctl(ihdr, sequenceNumber, 0, 0, img.Ihdr.Width, img.Ihdr.Height, delay, ApngDisposeOperation.None, ApngBlendOperation.Source), new Fdat(sequenceNumber+1, Encode(img, lastImage), true));
}
public Tuple<Fctl, Fdat> EncodeFrame(Ihdr ihdr, InternalImage img, uint sequenceNumber, InternalImage lastImage, Rational delay)
{
return new Tuple<Fctl, Fdat>(new Fctl(ihdr, sequenceNumber, 0, 0, img.Ihdr.Width, img.Ihdr.Height, delay, ApngDisposeOperation.None, ApngBlendOperation.Source), new Fdat(sequenceNumber+1, Encode(img, lastImage), true));
}