protected virtual async Task <Stream> CreateImageWriterStreamAsync(ImageConfiguration configuration, Stream output, long totalBytes)
{
Imaging.ImageFormat imageFormat = ImageFormatFactory.GetFormat(configuration.Format);
ImageOptions imageOptions = GenerateImageOptions(configuration, imageFormat, CalculateImageDimensions(imageFormat, totalBytes));
Stream imageStream = imageFormat.CreateWriter(imageOptions).CreateOutputStream(output, true, EncodingConfiguration.BufferSize);
await WriteHeaderAsync(imageStream);
return(imageStream);
}
protected override async Task <Stream> CreateImageWriterStreamAsync(ImageConfiguration configuration, Stream output, long totalBytes)
{
Imaging.ImageFormat imageFormat = ImageFormatFactory.GetFormat(configuration.Format);
var pixelStorageSerializer = new PixelStorageOptionsSerializer();
totalBytes += pixelStorageSerializer.CalculateStorageLength(imageFormat);
ImageDimensions embeddedImageDimensions = null;
PixelStorageOptions pixelStorageOptions;
Stream embeddedImageStream = null;
if (configuration.HasEmbeddedImage)
{
embeddedImageDimensions = new ImageDimensions(configuration.EmbeddedImage.Image);
pixelStorageOptions = _pixelStorageCalculator.CalculatePixelStorageOptions(
imageFormat,
configuration.EmbeddedImage.EmbeddedPixelStorage,
embeddedImageDimensions,
totalBytes);
embeddedImageStream = imageFormat.LoadPixelDataStream(configuration.EmbeddedImage.Image);
}
else
{
pixelStorageOptions = imageFormat.PixelStorageWithBitsPerChannel(
8,
PixelStorageOptions.BitStorageMode.MostSignificantBits);
}
byte[] pixelStorageBytes = await pixelStorageSerializer.SerializeToBytesAsync(pixelStorageOptions);
int embeddedImageRepeats;
ImageOptions imageOptions = GenerateImageOptions(
configuration,
imageFormat,
CalculateImageDimensions(imageFormat, pixelStorageOptions, embeddedImageDimensions, totalBytes, out embeddedImageRepeats));
Stream imageStream = imageFormat.CreateWriter(imageOptions).CreateOutputStream(output, true, EncodingConfiguration.BufferSize);
await WriteHeaderAsync(imageStream);
await imageStream.WriteAsync(pixelStorageBytes, 0, pixelStorageBytes.Length);
if (configuration.HasEmbeddedImage)
{
var repeatingImageStream = new RepeatingStream(embeddedImageStream, embeddedImageRepeats);
return(new PixelStorageWriterStream(
imageStream,
new SubStream(
repeatingImageStream,
imageStream.Position,
repeatingImageStream.Length - repeatingImageStream.Position - imageStream.Position),
pixelStorageOptions,
leaveOpen: false,
bufferSize: EncodingConfiguration.BufferSize));
}
return(imageStream);
}
protected bool CanUseImageFormatCompression(ImageConfiguration configuration)
{
return(configuration.HasCompression &&
ImageFormatFactory.GetFormat(configuration.Format).CompressionType == configuration.Compression.Type);
}
