public PNGChunk(PNGChunk c)
{
length = c.length;
signature = c.signature;
data = c.data;
crc = c.crc;
}
public static void Save(Image src, string dFile)
{
if ((src is Bitmap) && (src.RawFormat.Guid == ImageFormat.Png.Guid))
{
Bitmap srcB = (Bitmap)src;
// TODO should we premultiply by alpha???
if (srcB.PixelFormat == PixelFormat.Format32bppArgb || srcB.PixelFormat == PixelFormat.Format24bppRgb)
{
SwapRandB(srcB, srcB.PixelFormat == PixelFormat.Format32bppArgb);
}
MemoryStream ms = new MemoryStream();
srcB.Save(ms, ImageFormat.Png);
//srcB.Save("debug.png", ImageFormat.Png);
ms.Seek(0, SeekOrigin.Begin);
BinaryReader br = new BinaryReader(ms);
List <PNGChunk> chunks = ReadPNG(br);
br.Close();
ms.Close();
// add the iPhone chunk
PNGChunk iPhoneChunk = new PNGChunk("CgBI");
iPhoneChunk.Data = new byte[] { 0x30, 0x0, 0x20, 0x06 }; // guess?
iPhoneChunk.CRC = 0x179e8065;
chunks.Insert(0, iPhoneChunk);
// fix IDAT chunks
foreach (PNGChunk c in chunks)
{
if (c.Signature == "IDAT")
{
byte[] orig = c.Data;
byte[] newd = new byte[orig.Length - 6];
Array.Copy(orig, 2, newd, 0, orig.Length - 6); // drop zlib header/checksum
c.Data = newd;
}
}
FileStream fs = new FileStream(dFile, FileMode.Create, FileAccess.Write);
BinaryWriter bw = new BinaryWriter(fs);
WritePNG(chunks.ToArray(), bw);
bw.Close();
fs.Close();
}
else
{
src.Save(dFile);
}
}
void dIHDR(PNGChunk c) {
IHDRChunk ic = new IHDRChunk(c);
ind();
wo("Width: " + ic.Width);
wo("Height: " + ic.Height);
wo("BitDepth: " + ic.BitDepth);
wo("ColorType: " + ic.ColorType + " " + decodeColorType(ic));
oud();
}
public IHDRChunk(PNGChunk c)
: base(c)
{
MemoryStream ms = new MemoryStream(c.Data);
BinaryReader br = new BinaryReader(ms);
width = ReadUInt32BE(br);
height = ReadUInt32BE(br);
bitdepth = br.ReadByte();
colortype = br.ReadByte();
compressionmethod = br.ReadByte();
filtermethod = br.ReadByte();
interlacemethod = br.ReadByte();
}
public IHDRChunk(PNGChunk c)
: base(c)
{
MemoryStream ms = new MemoryStream(c.Data);
BinaryReader br = new BinaryReader(ms);
width = ReadUInt32BE(br);
height = ReadUInt32BE(br);
bitdepth = br.ReadByte();
colortype = br.ReadByte();
compressionmethod = br.ReadByte();
filtermethod = br.ReadByte();
interlacemethod = br.ReadByte();
}
public static List <PNGChunk> ReadPNG(BinaryReader br)
{
List <PNGChunk> chunks = new List <PNGChunk>();
foreach (byte b in PNGSignature)
{
byte testb = br.ReadByte();
if (b != testb)
{
throw new OutOfMemoryException();
}
}
// read all the chunks
PNGChunk c1;
do
{
c1 = new PNGChunk(br);
chunks.Add(c1);
} while (c1.Signature != "IEND");
return(chunks);
}
public PNGChunk(PNGChunk c)
{
length = c.length;
signature = c.signature;
data = c.data;
crc = c.crc;
}
public static void WritePNG(PNGChunk[] chunks, BinaryWriter bw)
{
bw.Write(PNGSignature);
foreach (PNGChunk c in chunks) {
c.Write(bw);
}
}
public static void Save(Image src, string dFile)
{
if ((src is Bitmap) && (src.RawFormat.Guid == ImageFormat.Png.Guid)) {
Bitmap srcB = (Bitmap)src;
// TODO should we premultiply by alpha???
if (srcB.PixelFormat == PixelFormat.Format32bppArgb || srcB.PixelFormat == PixelFormat.Format24bppRgb)
SwapRandB(srcB, srcB.PixelFormat == PixelFormat.Format32bppArgb);
MemoryStream ms = new MemoryStream();
srcB.Save(ms, ImageFormat.Png);
//srcB.Save("debug.png", ImageFormat.Png);
ms.Seek(0, SeekOrigin.Begin);
BinaryReader br = new BinaryReader(ms);
List<PNGChunk> chunks = ReadPNG(br);
br.Close();
ms.Close();
// add the iPhone chunk
PNGChunk iPhoneChunk = new PNGChunk("CgBI");
iPhoneChunk.Data = new byte[] { 0x30, 0x0, 0x20, 0x06 }; // guess?
iPhoneChunk.CRC = 0x179e8065;
chunks.Insert(0, iPhoneChunk);
// fix IDAT chunks
foreach (PNGChunk c in chunks) {
if (c.Signature == "IDAT") {
byte[] orig = c.Data;
byte[] newd = new byte[orig.Length - 6];
Array.Copy(orig, 2, newd, 0, orig.Length - 6); // drop zlib header/checksum
c.Data = newd;
}
}
FileStream fs = new FileStream(dFile, FileMode.Create, FileAccess.Write);
BinaryWriter bw = new BinaryWriter(fs);
WritePNG(chunks.ToArray(), bw);
bw.Close();
fs.Close();
}
else
src.Save(dFile);
}
public static List<PNGChunk> ReadPNG(BinaryReader br)
{
List<PNGChunk> chunks = new List<PNGChunk>();
foreach (byte b in PNGSignature) {
byte testb = br.ReadByte();
if (b != testb)
throw new OutOfMemoryException();
}
// read all the chunks
PNGChunk c1;
do {
c1 = new PNGChunk(br);
chunks.Add(c1);
} while (c1.Signature != "IEND");
return chunks;
}
