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);
}
}
private long CalculateExtentOffset(ulong baseOffset, ConstructionMethod constructionMethod, ItemLocationExtent extent)
{
if (extent is null)
{
ExceptionUtil.ThrowArgumentNullException(nameof(extent));
}
ulong offset;
try
{
if (constructionMethod == ConstructionMethod.FileOffset)
{
checked
{
offset = baseOffset + extent.Offset;
if ((offset + extent.Length) > this.fileLength)
{
throw new FormatException("The item has an invalid file offset.");
}
}
}
else if (constructionMethod == ConstructionMethod.IDatBoxOffset)
{
ItemDataBox dataBox = this.metaBox.ItemData;
if (dataBox is null)
{
throw new FormatException("The file does not have an item data box.");
}
checked
{
if ((extent.Offset + extent.Length) > (ulong)dataBox.Length)
{
throw new FormatException("The item has an invalid data box offset.");
}
offset = (ulong)dataBox.Offset + extent.Offset;
if ((offset + extent.Length) > this.fileLength)
{
throw new FormatException("The item has an invalid file offset.");
}
}
}
else
{
throw new FormatException($"ItemLocationEntry construction method { constructionMethod } is not supported.");
}
}
catch (OverflowException ex)
{
throw new FormatException("Overflow when attempting to calculate the item file offset.", ex);
}
if (offset > long.MaxValue)
{
throw new FormatException($"The item file offset exceeds {long.MaxValue:F0} bytes.");
}
return((long)offset);
}