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();
}
string decodeColorType(IHDRChunk ic) {
List<string> ans = new List<string>();
if (ic.HasPalette)
ans.Add("palette");
if (ic.HasColor)
ans.Add("color");
if (ic.HasAlpha)
ans.Add("alpha");
return String.Join(",", ans.ToArray());
}
public static Image ImageFromFile(string fileName)
{
bool IsPNG = true;
List <PNGChunk> chunks = null;
try {
chunks = ReadPNG(fileName);
}
catch { // not a PNG file - let .Net handle it
IsPNG = false;
}
if (!IsPNG || chunks[0].Signature != "CgBI") // assume regular PNG
{
Image ti = Image.FromFile(fileName);
Image ans = CopyImage(ti);
ti.Dispose(); // make sure we don't lock the file
return(ans);
}
else // build a new PNG image
{
IHDRChunk hdrChunk = null;
// fix IDAT chunks
foreach (PNGChunk c in chunks)
{
if (c.Signature == "IDAT")
{
byte[] orig = c.Data;
byte[] newd = new byte[orig.Length + 6];
newd[0] = 0x78; // 0x38;
newd[1] = 0x9c; // 0x8d;
orig.CopyTo(newd, 2);
c.Data = newd;
}
else if (c.Signature == "IHDR")
{
hdrChunk = new IHDRChunk(c);
}
}
MemoryStream stdPNG = new MemoryStream();
BinaryWriter bw = new BinaryWriter(stdPNG);
// delete chunk 0 - it was the Apple specific chunk
chunks.RemoveAt(0);
WritePNG(chunks.ToArray(), bw);
stdPNG.Seek(0, SeekOrigin.Begin);
Bitmap newi = new Bitmap(stdPNG);
bw.Close();
stdPNG.Close();
// Swap the red & blue if color & 8 bpp
if (hdrChunk.HasColor && hdrChunk.BitDepth == 8)
{
SwapRandB(newi, hdrChunk.HasAlpha);
}
return(newi);
}
}
public static Image ImageFromFile(string fileName)
{
bool IsPNG = true;
List<PNGChunk> chunks = null;
try {
chunks = ReadPNG(fileName);
}
catch { // not a PNG file - let .Net handle it
IsPNG = false;
}
if (!IsPNG || chunks[0].Signature != "CgBI") { // assume regular PNG
Image ti = Image.FromFile(fileName);
Image ans = CopyImage(ti);
ti.Dispose(); // make sure we don't lock the file
return ans;
}
else { // build a new PNG image
IHDRChunk hdrChunk = null;
// fix IDAT chunks
foreach (PNGChunk c in chunks) {
if (c.Signature == "IDAT") {
byte[] orig = c.Data;
byte[] newd = new byte[orig.Length + 6];
newd[0] = 0x78; // 0x38;
newd[1] = 0x9c; // 0x8d;
orig.CopyTo(newd, 2);
c.Data = newd;
}
else if (c.Signature == "IHDR") {
hdrChunk = new IHDRChunk(c);
}
}
MemoryStream stdPNG = new MemoryStream();
BinaryWriter bw = new BinaryWriter(stdPNG);
// delete chunk 0 - it was the Apple specific chunk
chunks.RemoveAt(0);
WritePNG(chunks.ToArray(), bw);
stdPNG.Seek(0, SeekOrigin.Begin);
Bitmap newi = new Bitmap(stdPNG);
bw.Close();
stdPNG.Close();
// Swap the red & blue if color & 8 bpp
if (hdrChunk.HasColor && hdrChunk.BitDepth == 8) {
SwapRandB(newi, hdrChunk.HasAlpha);
}
return newi;
}
}
