public void ShouldReadIEND()
{
string filePath = @"../../../Data/przekladnia.png";
IEND iend = new IEND(PNGFile.Read(filePath).Last());
Assert.AreEqual("IEND", iend.Type);
}
// Info from:
// https://wiki.mozilla.org/APNG_Specification
// http://www.w3.org/TR/PNG/
/// <summary>
/// Save an animation in a APNG file (Firefox supported)
/// </summary>
/// <param name="pngs">All frames (path of files or bitmaps)</param>
/// <param name="apng">The path of the output file</param>
/// <param name="delay">The delay between frames (delay/1000)</param>
/// <param name="loops">The number of loops (if 0 = infinite)</param>
public static void Create(string[] pngs, string apng, int delay, int loops)
{
byte[] pngSignature = new byte[] { 137, 80, 78, 71, 13, 10, 26, 10 };
IHDR ihdr = Read_IHDR(pngs[0]);
#region Section acTL
acTL actl = new acTL();
actl.length = BitConverter.GetBytes(8).Reverse().ToArray();
actl.id = Encoding.ASCII.GetBytes(new char[] { 'a', 'c', 'T', 'L' });
actl.num_frames = BitConverter.GetBytes(pngs.Length).Reverse().ToArray();
actl.num_plays = BitConverter.GetBytes(loops).Reverse().ToArray(); // Loop
List <byte> stream = new List <byte>();
stream.AddRange(actl.id);
stream.AddRange(actl.num_frames);
stream.AddRange(actl.num_plays);
actl.crc = Helper.CRC32.Calculate(stream.ToArray());
stream.Clear();
#endregion
List <fcTL> fctl = new List <fcTL>();
List <fdAT> fdat = new List <fdAT>();
int i = 0;
fctl.Add(Read_fcTL(pngs[0], i, delay));
i++;
byte[] IDAT = Read_IDAT(pngs[0]);
foreach (string png in pngs)
{
if (png == pngs[0])
{
continue;
}
fctl.Add(Read_fcTL(png, i, delay));
i++;
fdat.Add(Read_fdAT(png, i));
i++;
}
IEND iend = new IEND();
iend.id = Encoding.ASCII.GetBytes(new char[] { 'I', 'E', 'N', 'D' });
iend.length = BitConverter.GetBytes(0);
iend.crc = Helper.CRC32.Calculate(iend.id);
Write(apng, pngSignature, ihdr, actl, IDAT, fctl.ToArray(), fdat.ToArray(), iend);
}
// Info from:
// https://wiki.mozilla.org/APNG_Specification
// http://www.w3.org/TR/PNG/
/// <summary>
/// Save an animation in a APNG file (Firefox supported)
/// </summary>
/// <param name="pngs">All frames (path of files or bitmaps)</param>
/// <param name="apng">The path of the output file</param>
/// <param name="delay">The delay between frames (delay/1000)</param>
/// <param name="loops">The number of loops (if 0 = infinite)</param>
public static void Create(string[] pngs, string apng, int delay, int loops)
{
byte[] pngSignature = new byte[] { 137, 80, 78, 71, 13, 10, 26, 10 };
IHDR ihdr = Read_IHDR(pngs[0]);
#region Section acTL
acTL actl = new acTL();
actl.length = BitConverter.GetBytes(8).Reverse().ToArray();
actl.id = Encoding.ASCII.GetBytes(new char[] { 'a', 'c', 'T', 'L' });
actl.num_frames = BitConverter.GetBytes(pngs.Length).Reverse().ToArray();
actl.num_plays = BitConverter.GetBytes(loops).Reverse().ToArray(); // Loop
List<byte> stream = new List<byte>();
stream.AddRange(actl.id);
stream.AddRange(actl.num_frames);
stream.AddRange(actl.num_plays);
actl.crc = Helper.CRC32.Calculate(stream.ToArray());
stream.Clear();
#endregion
List<fcTL> fctl = new List<fcTL>();
List<fdAT> fdat = new List<fdAT>();
int i = 0;
fctl.Add(Read_fcTL(pngs[0], i, delay));
i++;
byte[] IDAT = Read_IDAT(pngs[0]);
foreach (string png in pngs)
{
if (png == pngs[0])
continue;
fctl.Add(Read_fcTL(png, i, delay));
i++;
fdat.Add(Read_fdAT(png, i));
i++;
}
IEND iend = new IEND();
iend.id = Encoding.ASCII.GetBytes(new char[] { 'I', 'E', 'N', 'D' });
iend.length = BitConverter.GetBytes(0);
iend.crc = Helper.CRC32.Calculate(iend.id);
Write(apng, pngSignature, ihdr, actl, IDAT, fctl.ToArray(), fdat.ToArray(), iend);
}
private static void Write(string apng, byte[] signature, IHDR ihdr, acTL actl, byte[] idat,
fcTL[] fctl, fdAT[] fdat, IEND iend)
{
BinaryWriter bw = new BinaryWriter(new FileStream(apng, FileMode.Create));
bw.Write(signature);
bw.Write(ihdr.length);
bw.Write(ihdr.id);
bw.Write(ihdr.width);
bw.Write(ihdr.height);
bw.Write(ihdr.depth);
bw.Write(ihdr.colour_type);
bw.Write(ihdr.compression);
bw.Write(ihdr.filter);
bw.Write(ihdr.interlace);
bw.Write(ihdr.crc);
bw.Write(actl.length);
bw.Write(actl.id);
bw.Write(actl.num_frames);
bw.Write(actl.num_plays);
bw.Write(actl.crc);
bw.Write(fctl[0].length);
bw.Write(fctl[0].id);
bw.Write(fctl[0].sequence_numer);
bw.Write(fctl[0].width);
bw.Write(fctl[0].height);
bw.Write(fctl[0].x_offset);
bw.Write(fctl[0].y_offset);
bw.Write(fctl[0].delay_num);
bw.Write(fctl[0].delay_den);
bw.Write(fctl[0].dispose_op);
bw.Write(fctl[0].blend_op);
bw.Write(fctl[0].crc);
bw.Write(idat);
for (int i = 0; i < fdat.Length; i++)
{
bw.Write(fctl[i + 1].length);
bw.Write(fctl[i + 1].id);
bw.Write(fctl[i + 1].sequence_numer);
bw.Write(fctl[i + 1].width);
bw.Write(fctl[i + 1].height);
bw.Write(fctl[i + 1].x_offset);
bw.Write(fctl[i + 1].y_offset);
bw.Write(fctl[i + 1].delay_num);
bw.Write(fctl[i + 1].delay_den);
bw.Write(fctl[i + 1].dispose_op);
bw.Write(fctl[i + 1].blend_op);
bw.Write(fctl[i + 1].crc);
bw.Write(fdat[i].length);
bw.Write(fdat[i].id);
bw.Write(fdat[i].sequence_number);
bw.Write(fdat[i].data);
bw.Write(fdat[i].crc);
}
bw.Write(iend.length);
bw.Write(iend.id);
bw.Write(iend.crc);
bw.Flush();
bw.Close();
}
private static void Write(string apng, byte[] signature, IHDR ihdr, acTL actl, byte[] idat,
fcTL[] fctl, fdAT[] fdat, IEND iend)
{
BinaryWriter bw = new BinaryWriter(new FileStream(apng, FileMode.Create));
bw.Write(signature);
bw.Write(ihdr.length);
bw.Write(ihdr.id);
bw.Write(ihdr.width);
bw.Write(ihdr.height);
bw.Write(ihdr.depth);
bw.Write(ihdr.colour_type);
bw.Write(ihdr.compression);
bw.Write(ihdr.filter);
bw.Write(ihdr.interlace);
bw.Write(ihdr.crc);
bw.Write(actl.length);
bw.Write(actl.id);
bw.Write(actl.num_frames);
bw.Write(actl.num_plays);
bw.Write(actl.crc);
bw.Write(fctl[0].length);
bw.Write(fctl[0].id);
bw.Write(fctl[0].sequence_numer);
bw.Write(fctl[0].width);
bw.Write(fctl[0].height);
bw.Write(fctl[0].x_offset);
bw.Write(fctl[0].y_offset);
bw.Write(fctl[0].delay_num);
bw.Write(fctl[0].delay_den);
bw.Write(fctl[0].dispose_op);
bw.Write(fctl[0].blend_op);
bw.Write(fctl[0].crc);
bw.Write(idat);
for (int i = 0; i < fdat.Length; i++)
{
bw.Write(fctl[i + 1].length);
bw.Write(fctl[i + 1].id);
bw.Write(fctl[i + 1].sequence_numer);
bw.Write(fctl[i + 1].width);
bw.Write(fctl[i + 1].height);
bw.Write(fctl[i + 1].x_offset);
bw.Write(fctl[i + 1].y_offset);
bw.Write(fctl[i + 1].delay_num);
bw.Write(fctl[i + 1].delay_den);
bw.Write(fctl[i + 1].dispose_op);
bw.Write(fctl[i + 1].blend_op);
bw.Write(fctl[i + 1].crc);
bw.Write(fdat[i].length);
bw.Write(fdat[i].id);
bw.Write(fdat[i].sequence_number);
bw.Write(fdat[i].data);
bw.Write(fdat[i].crc);
}
bw.Write(iend.length);
bw.Write(iend.id);
bw.Write(iend.crc);
bw.Flush();
bw.Close();
}
