private void DecodeColorImage(uint itemId, DecodeInfo decodeInfo, CICPColorData?colorConversionInfo, Surface fullSurface)
{
using (AvifItemData color = ReadColorImage(itemId))
{
AvifNative.DecompressColor(color, colorConversionInfo, decodeInfo, fullSurface);
}
}
private void DecodeAlphaImage(uint itemId, DecodeInfo decodeInfo, Surface fullSurface)
{
using (AvifItemData alpha = ReadAlphaImage(itemId))
{
AvifNative.DecompressAlpha(alpha, decodeInfo, fullSurface);
}
}
public static void DecompressAlpha(AvifItemData alphaImage,
DecodeInfo decodeInfo,
Surface fullSurface)
{
if (alphaImage is null)
{
ExceptionUtil.ThrowArgumentNullException(nameof(alphaImage));
}
if (decodeInfo is null)
{
ExceptionUtil.ThrowArgumentNullException(nameof(decodeInfo));
}
if (fullSurface is null)
{
ExceptionUtil.ThrowArgumentNullException(nameof(fullSurface));
}
DecoderStatus status = DecoderStatus.Ok;
unsafe
{
alphaImage.UseBufferPointer((ptr, length) =>
{
BitmapData bitmapData = new BitmapData
{
scan0 = fullSurface.Scan0.Pointer,
width = (uint)fullSurface.Width,
height = (uint)fullSurface.Height,
stride = (uint)fullSurface.Stride
};
UIntPtr alphaImageSize = new UIntPtr(length);
if (IntPtr.Size == 8)
{
status = AvifNative_64.DecompressAlphaImage(ptr,
alphaImageSize,
decodeInfo,
ref bitmapData);
}
else
{
status = AvifNative_86.DecompressAlphaImage(ptr,
alphaImageSize,
decodeInfo,
ref bitmapData);
}
});
}
if (status != DecoderStatus.Ok)
{
HandleError(status);
}
}
public byte[] GetExifData()
{
VerifyNotDisposed();
ItemLocationEntry entry = this.parser.TryGetExifLocation(this.primaryItemId);
if (entry != null)
{
ulong length = entry.TotalItemSize;
// Ignore any EXIF blocks that are larger than 2GB.
if (length < int.MaxValue)
{
using (AvifItemData itemData = this.parser.ReadItemData(entry))
using (Stream stream = itemData.GetStream())
{
// The EXIF data block has a header that indicates the number of bytes
// that come before the start of the TIFF header.
// See ISO/IEC 23008-12:2017 section A.2.1.
long tiffStartOffset = stream.TryReadUInt32BigEndian();
if (tiffStartOffset != -1)
{
long dataLength = (long)length - tiffStartOffset - sizeof(uint);
if (dataLength > 0)
{
if (tiffStartOffset != 0)
{
stream.Position += tiffStartOffset;
}
byte[] bytes = new byte[dataLength];
stream.ProperRead(bytes, 0, bytes.Length);
return(bytes);
}
}
}
}
}
return(null);
}
private ImageGridDescriptor TryGetImageGridDescriptor(uint itemId)
{
IItemInfoEntry entry = TryGetItemInfoEntry(itemId);
if (entry != null && entry.ItemType == ItemInfoEntryTypes.ImageGrid)
{
ItemLocationEntry locationEntry = TryGetItemLocation(itemId);
if (locationEntry != null)
{
if (locationEntry.TotalItemSize < ImageGridDescriptor.SmallDescriptorLength)
{
ExceptionUtil.ThrowFormatException("Invalid image grid descriptor length.");
}
using (AvifItemData itemData = ReadItemData(locationEntry))
{
Stream stream = null;
try
{
stream = itemData.GetStream();
using (EndianBinaryReader imageGridReader = new EndianBinaryReader(stream, this.reader.Endianess, this.arrayPool))
{
stream = null;
return(new ImageGridDescriptor(imageGridReader, itemData.Length));
}
}
finally
{
stream?.Dispose();
}
}
}
}
return(null);
}
public byte[] GetXmpData()
{
VerifyNotDisposed();
ItemLocationEntry entry = this.parser.TryGetXmpLocation(this.primaryItemId);
if (entry != null)
{
ulong length = entry.TotalItemSize;
// Ignore any XMP packets that are larger than 2GB.
if (length < int.MaxValue)
{
using (AvifItemData itemData = this.parser.ReadItemData(entry))
{
return(itemData.ToArray());
}
}
}
return(null);
}
public static void DecompressColor(AvifItemData colorImage,
CICPColorData?colorConversionInfo,
DecodeInfo decodeInfo,
Surface fullSurface)
{
if (colorImage is null)
{
ExceptionUtil.ThrowArgumentNullException(nameof(colorImage));
}
if (decodeInfo is null)
{
ExceptionUtil.ThrowArgumentNullException(nameof(decodeInfo));
}
if (fullSurface is null)
{
ExceptionUtil.ThrowArgumentNullException(nameof(fullSurface));
}
DecoderStatus status = DecoderStatus.Ok;
unsafe
{
colorImage.UseBufferPointer((ptr, length) =>
{
BitmapData bitmapData = new BitmapData
{
scan0 = fullSurface.Scan0.Pointer,
width = (uint)fullSurface.Width,
height = (uint)fullSurface.Height,
stride = (uint)fullSurface.Stride
};
UIntPtr colorImageSize = new UIntPtr(length);
if (colorConversionInfo.HasValue)
{
CICPColorData colorData = colorConversionInfo.Value;
if (IntPtr.Size == 8)
{
status = AvifNative_64.DecompressColorImage(ptr,
colorImageSize,
ref colorData,
decodeInfo,
ref bitmapData);
}
else
{
status = AvifNative_86.DecompressColorImage(ptr,
colorImageSize,
ref colorData,
decodeInfo,
ref bitmapData);
}
}
else
{
if (IntPtr.Size == 8)
{
status = AvifNative_64.DecompressColorImage(ptr,
colorImageSize,
IntPtr.Zero,
decodeInfo,
ref bitmapData);
}
else
{
status = AvifNative_86.DecompressColorImage(ptr,
colorImageSize,
IntPtr.Zero,
decodeInfo,
ref bitmapData);
}
}
});
}
if (status != DecoderStatus.Ok)
{
HandleError(status);
}
}
