/// <summary>
/// Converts the stream of image camera views to a different pixel format.
/// </summary>
/// <param name="source">The source stream of image camera views.</param>
/// <param name="scaleX">Scale factor for X.</param>
/// <param name="scaleY">Scale factor for Y.</param>
/// <param name="samplingMode">Method for sampling pixels when rescaling.</param>
/// <param name="deliveryPolicy">An optional delivery policy.</param>
/// <param name="sharedImageAllocator">Optional image allocator for creating new shared images.</param>
/// <param name="name">An optional name for the stream operator.</param>
/// <returns>The resulting stream.</returns>
public static IProducer <ImageCameraView> Scale(
this IProducer <ImageCameraView> source,
float scaleX,
float scaleY,
SamplingMode samplingMode = SamplingMode.Bilinear,
DeliveryPolicy <ImageCameraView> deliveryPolicy = null,
Func <int, int, PixelFormat, Shared <Image> > sharedImageAllocator = null,
string name = nameof(Scale))
{
sharedImageAllocator ??= (width, height, pixelFormat) => ImagePool.GetOrCreate(width, height, pixelFormat);
return(source.Process <ImageCameraView, ImageCameraView>(
(imageCameraView, envelope, emitter) =>
{
// if the image is null, post null
if (imageCameraView == null)
{
emitter.Post(null, envelope.OriginatingTime);
}
else
{
int finalWidth = (int)(imageCameraView.ViewedObject.Resource.Width * scaleX);
int finalHeight = (int)(imageCameraView.ViewedObject.Resource.Height * scaleY);
using var scaledSharedImage = sharedImageAllocator(finalWidth, finalHeight, imageCameraView.ViewedObject.Resource.PixelFormat);
imageCameraView.ViewedObject.Resource.Scale(scaledSharedImage.Resource, scaleX, scaleY, samplingMode);
using var outputImageCameraView = new ImageCameraView(scaledSharedImage, imageCameraView.CameraIntrinsics, imageCameraView.CameraPose);
emitter.Post(outputImageCameraView, envelope.OriginatingTime);
}
},
deliveryPolicy,
name));
}
/// <summary>
/// Converts the stream of image camera views to a different pixel format.
/// </summary>
/// <param name="source">The source stream of image camera views.</param>
/// <param name="pixelFormat">The pixel format to convert to.</param>
/// <param name="deliveryPolicy">An optional delivery policy.</param>
/// <param name="sharedImageAllocator">Optional image allocator for creating new shared images.</param>
/// <param name="name">An optional name for the stream operator.</param>
/// <returns>The resulting stream.</returns>
public static IProducer <ImageCameraView> Convert(
this IProducer <ImageCameraView> source,
PixelFormat pixelFormat,
DeliveryPolicy <ImageCameraView> deliveryPolicy = null,
Func <int, int, PixelFormat, Shared <Image> > sharedImageAllocator = null,
string name = nameof(Convert))
{
sharedImageAllocator ??= (width, height, pixelFormat) => ImagePool.GetOrCreate(width, height, pixelFormat);
return(source.Process <ImageCameraView, ImageCameraView>(
(imageCameraView, envelope, emitter) =>
{
// if the image is null, post null
if (imageCameraView == null)
{
emitter.Post(null, envelope.OriginatingTime);
}
else if (pixelFormat == imageCameraView.ViewedObject.Resource.PixelFormat)
{
// o/w if image is already in the requested format, shortcut the conversion
emitter.Post(imageCameraView, envelope.OriginatingTime);
}
else
{
using var image = sharedImageAllocator(imageCameraView.ViewedObject.Resource.Width, imageCameraView.ViewedObject.Resource.Height, pixelFormat);
imageCameraView.ViewedObject.Resource.CopyTo(image.Resource);
using var outputImageCameraView = new ImageCameraView(image, imageCameraView.CameraIntrinsics, imageCameraView.CameraPose);
emitter.Post(outputImageCameraView, envelope.OriginatingTime);
}
},
deliveryPolicy,
name));
}
/// <summary>
/// Decodes an encoded image camera view using a specified image decoder.
/// </summary>
/// <param name="source">The source stream of encoded image camera views.</param>
/// <param name="decoder">The image decoder to use.</param>
/// <param name="deliveryPolicy">An optional delivery policy.</param>
/// <param name="name">An optional name for the stream operator.</param>
/// <returns>A stream of decoded image camera views.</returns>
public static IProducer <ImageCameraView> Decode(
this IProducer <EncodedImageCameraView> source,
IImageFromStreamDecoder decoder,
DeliveryPolicy <EncodedImageCameraView> deliveryPolicy = null,
string name = nameof(Decode))
{
return(source.Process <EncodedImageCameraView, ImageCameraView>(
(encodedImageCameraView, envelope, emitter) =>
{
var encodedImage = encodedImageCameraView.ViewedObject.Resource;
using var image = ImagePool.GetOrCreate(encodedImage.Width, encodedImage.Height, encodedImage.PixelFormat);
image.Resource.DecodeFrom(encodedImage, decoder);
using var imageCameraView = new ImageCameraView(image, encodedImageCameraView.CameraIntrinsics, encodedImageCameraView.CameraPose);
emitter.Post(imageCameraView, envelope.OriginatingTime);
},
deliveryPolicy,
name));
}
