internal static InputDescriptor FromFile(string fileName)
{
var result = new InputDescriptor {
FailOnError = true,
File = fileName,
};
return(result);
}
internal static InputDescriptor FromBuffer(byte[] buffer)
{
var result = new InputDescriptor {
Buffer = buffer,
FailOnError = true
};
return(result);
}
internal static InputDescriptor FromCreate(int width, int height, int channels, int red, int green, int blue, int alpha)
{
if (width < 0)
{
throw new ArgumentOutOfRangeException(nameof(width), "Width must be greater than zero.");
}
if (height < 0)
{
throw new ArgumentOutOfRangeException(nameof(height), "Height must be greater than zero.");
}
if (channels != 3 || channels != 4)
{
throw new ArgumentOutOfRangeException(nameof(channels), "Channels must be 3 or 4.");
}
if (red < 0 || red > 255)
{
throw new ArgumentOutOfRangeException(nameof(red), "Red must be 0 to 255.");
}
if (green < 0 || green > 255)
{
throw new ArgumentOutOfRangeException(nameof(green), "Green must be 0 to 255.");
}
if (blue < 0 || blue > 255)
{
throw new ArgumentOutOfRangeException(nameof(blue), "Blue must be 0 to 255.");
}
if (alpha < 0 || alpha > 255)
{
throw new ArgumentOutOfRangeException(nameof(alpha), "Alpha must be 0 to 255.");
}
var result = new InputDescriptor {
CreateWidth = width,
CreateHeight = height,
CreateChannels = channels,
FailOnError = true,
CreateBackground = new List <double> {
red, green, blue, alpha
}
};
return(result);
}
internal static InputDescriptor FromRaw(int width, int height, int channels)
{
if (width < 0)
{
throw new ArgumentOutOfRangeException(nameof(width), "Width must be greater than zero.");
}
if (height < 0)
{
throw new ArgumentOutOfRangeException(nameof(height), "Height must be greater than zero.");
}
if (channels < 1 || channels > 4)
{
throw new ArgumentOutOfRangeException(nameof(channels), "Channels must be 1 to 4.");
}
var result = new InputDescriptor {
Buffer = Array.Empty <byte>(),
FailOnError = true,
RawWidth = width,
RawHeight = height,
RawChannels = channels,
};
return(result);
}
public static (Image Image, ImageType ImageType) OpenInput(InputDescriptor descriptor, string accessMethod)
{
descriptor = Guard.NotNull(descriptor, nameof(descriptor));
Image image;
ImageType imageType;
if (descriptor.Buffer != null)
{
if (descriptor.RawChannels > 0)
{
// raw, uncompressed pixel data
image = Image.NewFromMemory(descriptor.Buffer, descriptor.RawWidth, descriptor.RawHeight, descriptor.RawChannels, Enums.BandFormat.Uchar);
image.Set("interpretation", descriptor.RawChannels < 3 ? Enums.Interpretation.Bw : Enums.Interpretation.Srgb);
imageType = ImageType.Raw;
}
else
{
// Compressed data
imageType = ImageType.FromBuffer(descriptor.Buffer);
if (imageType == ImageType.Unknown)
{
throw new VipsException("Input buffer contains unsupported image format.");
}
try {
var option = new VOption {
{ "access", accessMethod },
{ "fail", descriptor.FailOnError }
};
if (imageType == ImageType.Svg || imageType == ImageType.Pdf)
{
option.Add("dpi", descriptor.Density);
}
if (imageType == ImageType.Magick)
{
option.Add("density", descriptor.Density);
}
if (imageType.SupportsPages)
{
option.Add("n", descriptor.Pages);
option.Add("page", descriptor.Page);
}
image = Image.NewFromBuffer(descriptor.Buffer, null, null, null, option);
if (imageType == ImageType.Svg || imageType == ImageType.Pdf || imageType == ImageType.Magick)
{
image.SetDensity(descriptor.Density);
}
}
catch (Exception ex) {
throw new VipsException($"Input buffer has corrupt header: {ex.Message}", ex);
}
}
}
else
{
if (descriptor.CreateChannels > 0)
{
// create new image
var background = new List <double> {
descriptor.CreateBackground[0],
descriptor.CreateBackground[1],
descriptor.CreateBackground[2]
};
if (descriptor.CreateChannels == 4)
{
background.Add(descriptor.CreateBackground[3]);
}
image = Image.NewFromArray(background.ToArray()); // TODO: suspect
image.Set("interpretation", Enums.Interpretation.Srgb);
imageType = ImageType.Raw;
}
else
{
imageType = ImageType.FromFile(descriptor.File !);
if (imageType == ImageType.Missing)
{
throw new VipsException($"Input file {descriptor.File} is missing.");
}
if (imageType == ImageType.Unknown)
{
throw new VipsException("Input file contains unsupported image format.");
}
try {
var option = new VOption {
{ "access", accessMethod },
{ "fail", descriptor.FailOnError }
};
if (imageType == ImageType.Svg || imageType == ImageType.Pdf)
{
option.Add("dpi", descriptor.Density);
}
if (imageType == ImageType.Magick)
{
option.Add("density", descriptor.Density);
}
if (imageType.SupportsPages)
{
option.Add("n", descriptor.Pages);
option.Add("page", descriptor.Page);
}
image = Image.NewFromFile(descriptor.File, null, null, null, option);
if (imageType == ImageType.Svg || imageType == ImageType.Pdf || imageType == ImageType.Magick)
{
image.SetDensity(descriptor.Density);
}
}
catch (Exception ex) {
throw new VipsException($"Input file has corrupt header: {ex.Message}", ex);
}
}
}
return(image, imageType);
}