internal static void FromVector4 <TPixel>(
Configuration configuration,
PixelOperations <TPixel> pixelOperations,
ReadOnlySpan <Vector4> sourceVectors,
Span <TPixel> destPixels,
bool scaled)
where TPixel : struct, IPixel <TPixel>
{
Guard.NotNull(configuration, nameof(configuration));
Guard.DestinationShouldNotBeTooShort(sourceVectors, destPixels, nameof(destPixels));
int count = sourceVectors.Length;
// Not worth for small buffers:
if (count < Vector4ConversionThreshold)
{
FromVector4Fallback(sourceVectors, destPixels, scaled);
return;
}
// For the opposite direction it's not easy to implement the trick used in RunRgba32CompatibleToVector4Conversion,
// so let's allocate a temporary buffer as usually:
using (IMemoryOwner <Rgba32> tempBuffer = configuration.MemoryAllocator.Allocate <Rgba32>(count))
{
Span <Rgba32> tempSpan = tempBuffer.Memory.Span;
SimdUtils.BulkConvertNormalizedFloatToByteClampOverflows(
MemoryMarshal.Cast <Vector4, float>(sourceVectors),
MemoryMarshal.Cast <Rgba32, byte>(tempSpan));
pixelOperations.FromRgba32(configuration, tempSpan, destPixels);
}
}
internal static void FromVector4 <TPixel>(
Configuration configuration,
PixelOperations <TPixel> pixelOperations,
Span <Vector4> sourceVectors,
Span <TPixel> destPixels,
PixelConversionModifiers modifiers)
where TPixel : unmanaged, IPixel <TPixel>
{
Guard.NotNull(configuration, nameof(configuration));
Guard.DestinationShouldNotBeTooShort(sourceVectors, destPixels, nameof(destPixels));
int count = sourceVectors.Length;
// Not worth for small buffers:
if (count < Vector4ConversionThreshold)
{
Default.UnsafeFromVector4(sourceVectors, destPixels, modifiers);
return;
}
// TODO: Investigate optimized 1-pass approach!
ApplyBackwardConversionModifiers(sourceVectors, modifiers);
// For the opposite direction it's not easy to implement the trick used in RunRgba32CompatibleToVector4Conversion,
// so let's allocate a temporary buffer as usually:
using (IMemoryOwner <Rgba32> tempBuffer = configuration.MemoryAllocator.Allocate <Rgba32>(count))
{
Span <Rgba32> tempSpan = tempBuffer.Memory.Span;
SimdUtils.NormalizedFloatToByteSaturate(
MemoryMarshal.Cast <Vector4, float>(sourceVectors),
MemoryMarshal.Cast <Rgba32, byte>(tempSpan));
pixelOperations.FromRgba32(configuration, tempSpan, destPixels);
}
}