public PNGImage(System.IO.Stream inputStream)
{
validatePNG(inputStream);
List <Chunk> chunks = new List <Chunk>();
processPNG(chunks, inputStream);
for (int i = 0; i < chunks.Count; i++)
{
Chunk chunk = chunks[i];
if (chunk.type[0] == 'I' &&
chunk.type[1] == 'H' &&
chunk.type[2] == 'D' &&
chunk.type[3] == 'R')
{
this.w = toIntValue(chunk.GetData(), 0); // Width
this.h = toIntValue(chunk.GetData(), 4); // Height
this.bitDepth = chunk.GetData()[8]; // Bit Depth
this.colorType = chunk.GetData()[9]; // Color Type
// Console.WriteLine(
// "Bit Depth == " + chunk.GetData()[ 8 ] );
// Console.WriteLine(
// "Color Type == " + chunk.GetData()[ 9 ] );
// Console.WriteLine( chunk.GetData()[ 10 ] );
// Console.WriteLine( chunk.GetData()[ 11 ] );
// Console.WriteLine( chunk.GetData()[ 12 ] );
}
else if (chunk.type[0] == 'I' &&
chunk.type[1] == 'D' &&
chunk.type[2] == 'A' &&
chunk.type[3] == 'T')
{
data = appendIdatChunk(data, chunk.GetData());
}
else if (chunk.type[0] == 'P' &&
chunk.type[1] == 'L' &&
chunk.type[2] == 'T' &&
chunk.type[3] == 'E')
{
rgb = chunk.GetData();
if (rgb.Length % 3 != 0)
{
throw new Exception("Incorrect palette length.");
}
}
}
inflated = getDecompressedData();
if (colorType == 0)
{
// Grayscale Image
if (bitDepth == 16)
{
image = getImageColorType0BitDepth16();
}
else if (bitDepth == 8)
{
image = getImageColorType0BitDepth8();
}
else if (bitDepth == 4)
{
image = getImageColorType0BitDepth4();
}
else if (bitDepth == 2)
{
image = getImageColorType0BitDepth2();
}
else if (bitDepth == 1)
{
image = getImageColorType0BitDepth1();
}
else
{
throw new Exception("Image with unsupported bit depth == " + bitDepth);
}
}
else if (colorType == 6)
{
image = getImageColorType6BitDepth8();
}
else
{
// Color Image
if (rgb == null)
{
// Trucolor Image
if (bitDepth == 16)
{
image = getImageColorType2BitDepth16();
}
else
{
image = getImageColorType2BitDepth8();
}
}
else
{
// Indexed Image
if (bitDepth == 8)
{
image = getImageColorType3BitDepth8();
}
else if (bitDepth == 4)
{
image = getImageColorType3BitDepth4();
}
else if (bitDepth == 2)
{
image = getImageColorType3BitDepth2();
}
else if (bitDepth == 1)
{
image = getImageColorType3BitDepth1();
}
else
{
throw new Exception("Image with unsupported bit depth == " + bitDepth);
}
}
}
deflated = deflateReconstructedData();
}
