/// <summary>
/// Gets a list of the thumbnail image ids.
/// </summary>
/// <returns>A list of the thumbnail image ids.</returns>
/// <exception cref="HeifException">Could not get all of the thumbnail image ids.</exception>
/// <exception cref="ObjectDisposedException">The object has been disposed.</exception>
public IReadOnlyList <HeifItemId> GetThumbnailImageIds()
{
VerifyNotDisposed();
int count = LibHeifNative.heif_image_handle_get_number_of_thumbnails(this.imageHandle);
if (count == 0)
{
return(Array.Empty <HeifItemId>());
}
var ids = new HeifItemId[count];
unsafe
{
fixed(HeifItemId *ptr = ids)
{
int filledCount = LibHeifNative.heif_image_handle_get_list_of_thumbnail_IDs(this.imageHandle,
ptr,
count);
if (filledCount != count)
{
ExceptionUtil.ThrowHeifException(Resources.CannotGetAllThumbnailIds);
}
}
}
return(ids);
}
/// <summary>
/// Gets the meta-data bytes.
/// </summary>
/// <param name="id">The identifier.</param>
/// <returns>The meta-data bytes.</returns>
/// <exception cref="HeifException">
/// A LibHeif error occurred.
///
/// -or-
///
/// The meta-data block is larger than 2 GB.
/// </exception>
/// <exception cref="ObjectDisposedException">The object has been disposed.</exception>
public byte[] GetMetadata(HeifItemId id)
{
VerifyNotDisposed();
ulong size = LibHeifNative.heif_image_handle_get_metadata_size(this.imageHandle, id).ToUInt64();
if (size == 0)
{
return(null);
}
if (size > int.MaxValue)
{
ExceptionUtil.ThrowHeifException(Resources.MetadataBlockLargerThan2Gb);
}
byte[] metadata = new byte[size];
unsafe
{
fixed(byte *ptr = metadata)
{
var error = LibHeifNative.heif_image_handle_get_metadata(this.imageHandle, id, ptr);
error.ThrowIfError();
}
}
return(metadata);
}
/// <summary>
/// Gets the depth representation information.
/// </summary>
/// <param name="id">The depth image id.</param>
/// <returns>The depth representation information.</returns>
/// <exception cref="HeifException">A LibHeif error occurred.</exception>
/// <exception cref="ObjectDisposedException">The object has been disposed.</exception>
public HeifDepthRepresentationInfo GetDepthRepresentationInfo(HeifItemId id)
{
VerifyNotDisposed();
HeifDepthRepresentationInfo depthRepresentationInfo = null;
SafeDepthRepresentationInfo safeDepthRepresentationInfo = null;
try
{
if (LibHeifNative.heif_image_handle_get_depth_image_representation_info(this.imageHandle,
id,
out safeDepthRepresentationInfo))
{
unsafe
{
var info = (heif_depth_representation_info *)safeDepthRepresentationInfo.DangerousGetHandle();
depthRepresentationInfo = new HeifDepthRepresentationInfo(info);
}
}
}
finally
{
safeDepthRepresentationInfo?.Dispose();
}
return(depthRepresentationInfo);
}
/// <summary>
/// Gets the auxiliary image handle.
/// </summary>
/// <param name="id">The auxiliary image id.</param>
/// <returns>The auxiliary image handle.</returns>
/// <exception cref="HeifException">A LibHeif error occurred.</exception>
/// <exception cref="ObjectDisposedException">The object has been disposed.</exception>
/// <seealso cref="GetAuxiliaryImageIds"/>
public HeifImageHandle GetAuxiliaryImage(HeifItemId id)
{
VerifyNotDisposed();
if (LibHeifVersion.Is1Point11OrLater)
{
HeifImageHandle aux = null;
SafeHeifImageHandle auxSafeHandle = null;
try
{
var error = LibHeifNative.heif_image_handle_get_auxiliary_image_handle(this.imageHandle, id, out auxSafeHandle);
error.ThrowIfError();
aux = new HeifImageHandle(auxSafeHandle, this.decodeErrorHandler, AuxiliaryImageType.VendorSpecific);
auxSafeHandle = null;
}
finally
{
auxSafeHandle?.Dispose();
}
return(aux);
}
else
{
throw new HeifException(Resources.AuxiliaryImageAPINotSupported);
}
}
/// <summary>
/// Gets a list of the meta-data block ids.
/// </summary>
/// <param name="type">The meta-data block type.</param>
/// <param name="contentType">The meta-data block content type.</param>
/// <returns>A list of the meta-data block ids.</returns>
/// <exception cref="HeifException">Could not get all of the meta-data block ids.</exception>
/// <exception cref="ObjectDisposedException">The object has been disposed.</exception>
public IReadOnlyList <HeifItemId> GetMetadataBlockIds(string type = null, string contentType = null)
{
VerifyNotDisposed();
int count = LibHeifNative.heif_image_handle_get_number_of_metadata_blocks(this.imageHandle, type);
if (count == 0)
{
return(Array.Empty <HeifItemId>());
}
var ids = new HeifItemId[count];
unsafe
{
fixed(HeifItemId *ptr = ids)
{
int filledCount = LibHeifNative.heif_image_handle_get_list_of_metadata_block_IDs(this.imageHandle,
type,
ptr,
count);
if (filledCount != count)
{
ExceptionUtil.ThrowHeifException(Resources.CannotGetAllMetadataBlockIds);
}
}
}
// The type must be defined in order to filter by content type.
if (type != null && contentType != null)
{
var matchingItems = new List <HeifItemId>();
for (int i = 0; i < ids.Length; i++)
{
var id = ids[i];
var metadataContentType = LibHeifNative.heif_image_handle_get_metadata_content_type(this.imageHandle, id);
if (contentType.Equals(metadataContentType.GetStringValue(), StringComparison.Ordinal))
{
matchingItems.Add(id);
}
}
return(matchingItems);
}
else
{
return(ids);
}
}
/// <summary>
/// Gets a list of the auxiliary image ids.
/// </summary>
/// <returns>A list of the auxiliary image ids.</returns>
/// <exception cref="HeifException">A LibHeif error occurred.</exception>
/// <exception cref="ObjectDisposedException">The object has been disposed.</exception>
/// <remarks>
/// <para>The alpha and/or depth images are omitted from this list.</para>
/// <para>
/// LibHeif will include the alpha image (if present) when you call <see cref="Decode(HeifColorspace, HeifChroma, HeifDecodingOptions)"/>
/// with the <see cref="HeifChroma"/> parameter set to one of the <c>InterleavedRgba</c> values.
/// </para>
/// <para>
/// To read the depth images use <see cref="GetDepthImageIds"/> to get a list of the depth image item ids and
/// <see cref="GetDepthImage(HeifItemId)"/> to convert the item id to a <see cref="HeifImageHandle"/>.
/// </para>
/// </remarks>
/// <seealso cref="GetAuxiliaryImage(HeifItemId)"/>
/// <seealso cref="GetAuxiliaryType"/>
public IReadOnlyList <HeifItemId> GetAuxiliaryImageIds()
{
VerifyNotDisposed();
if (LibHeifVersion.Is1Point11OrLater)
{
const heif_auxiliary_image_filter filter = heif_auxiliary_image_filter.OmitAlpha | heif_auxiliary_image_filter.OmitDepth;
int count = LibHeifNative.heif_image_handle_get_number_of_auxiliary_images(this.imageHandle, filter);
if (count == 0)
{
return(Array.Empty <HeifItemId>());
}
var ids = new HeifItemId[count];
unsafe
{
fixed(HeifItemId *ptr = ids)
{
int filledCount = LibHeifNative.heif_image_handle_get_list_of_auxiliary_image_IDs(this.imageHandle,
filter,
ptr,
count);
if (filledCount != count)
{
ExceptionUtil.ThrowHeifException(Resources.CannotGetAllAuxillaryImages);
}
}
}
return(ids);
}
else
{
return(Array.Empty <HeifItemId>());
}
}
/// <summary>
/// Gets the thumbnail image handle.
/// </summary>
/// <param name="id">The thumbnail image id.</param>
/// <returns>The thumbnail image handle.</returns>
/// <exception cref="HeifException">A LibHeif error occurred.</exception>
/// <exception cref="ObjectDisposedException">The object has been disposed.</exception>
public HeifImageHandle GetThumbnailImage(HeifItemId id)
{
VerifyNotDisposed();
HeifImageHandle thumbnail = null;
SafeHeifImageHandle thumbnailSafeHandle = null;
try
{
var error = LibHeifNative.heif_image_handle_get_thumbnail(this.imageHandle, id, out thumbnailSafeHandle);
error.ThrowIfError();
thumbnail = new HeifImageHandle(thumbnailSafeHandle, this.decodeErrorHandler);
thumbnailSafeHandle = null;
}
finally
{
thumbnailSafeHandle?.Dispose();
}
return(thumbnail);
}
/// <summary>
/// Gets the depth images.
/// </summary>
/// <param name="id">The depth image id.</param>
/// <returns>The meta-data bytes.</returns>
/// <exception cref="HeifException">A LibHeif error occurred.</exception>
/// <exception cref="ObjectDisposedException">The object has been disposed.</exception>
public HeifImageHandle GetDepthImage(HeifItemId id)
{
VerifyNotDisposed();
HeifImageHandle depth = null;
SafeHeifImageHandle depthSafeHandle = null;
try
{
var error = LibHeifNative.heif_image_handle_get_depth_image_handle(this.imageHandle, id, out depthSafeHandle);
error.ThrowIfError();
depth = new HeifImageHandle(depthSafeHandle, this.decodeErrorHandler);
depthSafeHandle = null;
}
finally
{
depthSafeHandle?.Dispose();
}
return(depth);
}