private static IcnsImage LoadWithFreeImage(IcnsImageParser.IcnsElement element, IcnsType imageType)
{
using (MemoryStream ms = new MemoryStream(element.data))
{
FREE_IMAGE_FORMAT format = FREE_IMAGE_FORMAT.FIF_JP2;
FIBITMAP fib = FreeImage.LoadFromStream(ms, ref format);
Bitmap bmp = FreeImage.GetBitmap(fib);
FreeImage.Unload(fib);
return(new IcnsImage(bmp, imageType));
}
}
private static IcnsImage TryDecodingPng(IcnsImageParser.IcnsElement element, IcnsType imageType)
{
if (element.data.Length < PNG_SIGNATURE.Length)
{
return(null); // definitely not a valid png
}
for (int i = 0; i < PNG_SIGNATURE.Length; i++)
{
if (element.data[i] != PNG_SIGNATURE[i])
{
return(null); // not a png
}
}
using (MemoryStream ms = new MemoryStream(element.data))
return(new IcnsImage((Bitmap)Image.FromStream(ms), imageType)); // cast is valid, for PNG it will be Bitmap
}
private static IcnsImage DecodeImage(IcnsImageParser.IcnsElement imageElement, IcnsImageParser.IcnsElement[] icnsElements)
{
IcnsType imageType = IcnsType.FindType(imageElement.type, IcnsType.TypeDetails.Mask);
if (imageType == null)
{
return(null);
}
IcnsType maskType = null;
IcnsImageParser.IcnsElement maskElement = null;
if (imageType.Details == IcnsType.TypeDetails.HasMask)
{
maskType = imageType;
maskElement = imageElement;
}
else if (imageType.Details == IcnsType.TypeDetails.None)
{
maskType = IcnsType.FindType(imageType.Width, imageType.Height, 8, IcnsType.TypeDetails.Mask);
if (maskType != null)
{
maskElement = FindElement(icnsElements, maskType.Type);
}
if (maskElement == null)
{
maskType = IcnsType.FindType(imageType.Width, imageType.Height, 1, IcnsType.TypeDetails.Mask);
if (maskType != null)
{
maskElement = FindElement(icnsElements, maskType.Type);
}
}
}
if (imageType.Details == IcnsType.TypeDetails.Compressed ||
imageType.Details == IcnsType.TypeDetails.Retina)
{
IcnsImage result = TryDecodingPng(imageElement, imageType);
if (result != null)
{
return(result); // png
}
if (LoadJ2kImage == null)
{
return(null); // couldn't be loaded
}
return(LoadJ2kImage(imageElement, imageType));
}
int expectedSize = (imageType.Width * imageType.Height * imageType.BitsPerPixel + 7) / 8;
byte[] imageData;
if (imageElement.data.Length < expectedSize)
{
if (imageType.BitsPerPixel == 32)
{
imageData = Rle24Compression.Decompress(imageType.Width, imageType.Height, imageElement.data);
}
else
{
throw new Exception("Short image data but not a 32 bit compressed type");
}
}
else
{
imageData = imageElement.data;
}
Bitmap image = new Bitmap(imageType.Width, imageType.Height, PixelFormat.Format32bppArgb);
BitmapData bitmapData = image.LockBits(new Rectangle(0, 0, image.Width, image.Height), ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);
switch (imageType.BitsPerPixel)
{
case 1:
Decode1BPPImage(imageType, imageData, bitmapData);
break;
case 4:
Decode4BPPImage(imageType, imageData, bitmapData);
break;
case 8:
Decode8BPPImage(imageType, imageData, bitmapData);
break;
case 32:
if (imageType.Details == IcnsType.TypeDetails.ARGB)
{
Decode32BPPImageARGB(imageType, imageData, bitmapData);
}
else
{
Decode32BPPImage(imageType, imageData, bitmapData);
}
break;
default:
image.UnlockBits(bitmapData);
image.Dispose();
throw new NotSupportedException("Unsupported bit depth " + imageType.BitsPerPixel);
}
if (maskElement != null)
{
switch (maskType.BitsPerPixel)
{
case 1:
Apply1BPPMask(maskElement.data, bitmapData);
break;
case 8:
Apply8BPPMask(maskElement.data, bitmapData);
break;
default:
image.UnlockBits(bitmapData);
image.Dispose();
throw new NotSupportedException("Unsupport mask bit depth " + maskType.BitsPerPixel);
}
}
image.UnlockBits(bitmapData);
return(new IcnsImage(image, imageType));
}
