/// <summary>
/// Read all image frames.
/// </summary>
/// <param name="data">The span of bytes to read the image data from.</param>
/// <param name="readSettings">The settings to use when reading the image.</param>
/// <exception cref="MagickException">Thrown when an error is raised by ImageMagick.</exception>
public void Read(ReadOnlySpan <byte> data, IMagickReadSettings <QuantumType>?readSettings)
{
Throw.IfEmpty(nameof(data), data);
Clear();
AddImages(data, readSettings, false);
}
/// <summary>
/// Read only metadata and not the pixel data from all image frames.
/// </summary>
/// <param name="data">The sequence of bytes to read the image data from.</param>
/// <param name="readSettings">The settings to use when reading the image.</param>
/// <exception cref="MagickException">Thrown when an error is raised by ImageMagick.</exception>
public void Ping(ReadOnlySequence <byte> data, IMagickReadSettings <QuantumType>?readSettings)
{
Throw.IfEmpty(nameof(data), data);
Clear();
AddImages(data, readSettings, true);
}
/// <summary>
/// Returns the format information. The header of the image in the span of bytes is used to
/// determine the format.
/// </summary>
/// <param name="data">The span of bytes to read the image header from.</param>
/// <returns>The format information.</returns>
public static MagickFormatInfo?Create(ReadOnlySpan <byte> data)
{
Throw.IfEmpty(nameof(data), data);
var instance = new NativeMagickFormatInfo();
instance.GetInfoWithBlob(data, data.Length);
return(Create(instance));
}
private void CheckValues <T>(int x, int y, int width, int height, ReadOnlySpan <T> values)
{
CheckIndex(x, y);
Throw.IfEmpty(nameof(values), values);
Throw.IfFalse(nameof(values), values.Length % Channels == 0, $"Values should have {Channels} channels.");
int length = values.Length;
int max = width * height * Channels;
Throw.IfTrue(nameof(values), length > max, "Too many values specified.");
length = (x * y * Channels) + length;
max = Image.Width * Image.Height * Channels;
Throw.IfTrue(nameof(values), length > max, "Too many values specified.");
}
/// <summary>
/// Read single image frame.
/// </summary>
/// <param name="data">The span of quantum to read the image data from.</param>
/// <param name="settings">The pixel settings to use when reading the image.</param>
/// <exception cref="MagickException">Thrown when an error is raised by ImageMagick.</exception>
public void ReadPixels(ReadOnlySpan <QuantumType> data, IPixelReadSettings <QuantumType>?settings)
{
Throw.IfEmpty(nameof(data), data);
Throw.IfNull(nameof(settings), settings);
Throw.IfTrue(nameof(settings), string.IsNullOrEmpty(settings.Mapping), "Pixel storage mapping should be defined.");
Throw.IfTrue(nameof(settings), settings.StorageType != StorageType.Quantum, $"Storage type should be {nameof(StorageType.Quantum)}.");
var newReadSettings = CreateReadSettings(settings.ReadSettings);
SetSettings(newReadSettings);
var count = data.Length;
var expectedLength = GetExpectedLength(settings);
Throw.IfTrue(nameof(data), count < expectedLength, "The count is " + count + " but should be at least " + expectedLength + ".");
_nativeInstance.ReadPixels(settings.ReadSettings.Width !.Value, settings.ReadSettings.Height !.Value, settings.Mapping, settings.StorageType, data, 0);
}
/// <summary>
/// Read single image frame.
/// </summary>
/// <param name="data">The sequence of bytes to read the image data from.</param>
/// <param name="readSettings">The settings to use when reading the image.</param>
/// <exception cref="MagickException">Thrown when an error is raised by ImageMagick.</exception>
public void Read(ReadOnlySequence <byte> data, IMagickReadSettings <QuantumType>?readSettings)
{
Throw.IfEmpty(nameof(data), data);
Read(data, readSettings, false);
}
/// <summary>
/// Reads only metadata and not the pixel data.
/// </summary>
/// <param name="data">The span of bytes to read the information from.</param>
/// <param name="readSettings">The settings to use when reading the image.</param>
/// <exception cref="MagickException">Thrown when an error is raised by ImageMagick.</exception>
public void Ping(ReadOnlySpan <byte> data, IMagickReadSettings <QuantumType>?readSettings)
{
Throw.IfEmpty(nameof(data), data);
Read(data, readSettings, true);
}
