Image.Load<Rgba32> does not respect PreferContiguousImageBuffers

[roeyskoe]

Prerequisites

• I have written a descriptive issue title
• I have verified that I am running the latest version of ImageSharp
• I have verified if the problem exist in both DEBUG and RELEASE mode
• I have searched open and closed issues to ensure it has not already been reported

Description

Following this sample: https://docs.sixlabors.com/articles/imagesharp/memorymanagement.html#enforcing-contiguous-buffers
but instead loading an image file

using (Image<Rgba32> image = Image.Load<Rgba32>(customConfig, "big.png"))

will result in discontigous memory being used.

This is probably caused by https://github.com/SixLabors/ImageSharp/blob/master/src/ImageSharp/Image.Decode.cs#L41
not passing configuration.PreferContiguousImageBuffers to Allocate2D. Adding this extra parameter fixes the issue on my use case.

I did not open a PR for that, since I am not familiar with ImageSharps internal workings and am not sure if this issue also exists elsewhere.

Steps to Reproduce

https://github.com/roeyskoe/ImageSharpContiguous

System Configuration

• ImageSharp version: 2.0.0 (also when using latest source)
• Other ImageSharp packages and versions: -
• Environment (Operating system, version and so on): Windows 10 x64 10.0.19044
• .NET Framework version: .NET 6
• Additional information: