InteropTypes

This repository contains an heterogeneous collection of loosely coupled libraries designed to interoperate with third party libraries.

InteropTypes.Graphics.Bitmaps

An experimental, proof of concept, low level library to exchange bitmaps between imaging libraries.

There's already a good number of great imaging libraries around, some of them are general purpose, while others solve specific problems, but certainly, there's no imaging library that fits all needs, so in many cases, developers are forced to use multiple imaging libraries concurrently.

This is specially true when dealing with image acquisition devices, GPU textures, or client bitmaps like GDI or WIC, that typically use unmanaged memory to store bitmaps, and forces developers to write cumbersome and sometimes dangerous code.

Exchanging bitmaps between libraries is a challenge, and InteropTypes.Graphics.Bitmaps is an attempt to solve this issue by providing a number of low level bitmap types that can be instantiated over existing memory:

Memory type	Bitmap type
IntPtr	PointerBitmap
Span<Byte>	SpanBitmap, SpanBitmap<TPixel>
Memory<Byte>	MemoryBitmap, MemoryBitmap<TPixel>

These types simply wrap previously existing memory, and provide mechanisms to access bitmap data in a safer way.

InteropTypes.Graphics.Drawing

Provides a set of common interfaces for drawing basic vector shapes, both in 2D and 3D

The purpose of this library is to allow writing once, code that draws vector shapes but can draw to canvas of different APIs and SDKs

InteropTypes.Graphics.Backends

In order to interoperate with commonly used libraries, a number of backend extensions are provided.

Notice that using these backends is entirely optional.

Target Library	Package
System.Drawing.Common	InteropBitmaps.Backends.GDI
System.Windows.Media	InteropBitmaps.Backends.WPF
SixLabors.ImageSharp	InteropBitmaps.Backends.ImageSharp
SkiaSharp	InteropBitmaps.Backends.SkiaSharp
StbImageLib	InteropBitmaps.Backends.STB

Additionally, I'm experimenting with other image based libraries:

Target Library	Package
OpenCVSharp4	InteropBitmaps.Backends.OpenCVSharp4

Other libraries I am considering are: ImageMagick, SharpDX, and some sensor libraries like Kinectv2, Orbbec and Nuitrack.

InteropTypes.Tensors

A highly experimental library to deal with in memory dense tensors.

Similar to InteropBitmaps, it wraps a raw memory pointer and exposes it as a multidimensional dense tensor array.

Example

Here's an example of using different backends:

// Use SkiaSharp to load a WEBP image:
var bmp = MemoryBitmap.Load("shannon.webp", Codecs.SkiaCodec.Default);

// Use OpenCV to resize the image:
bmp = bmp
    .WithOpenCv()
    .ToResizedMemoryBitmap(55, 55, OpenCvSharp.InterpolationFlags.Lanczos4)

// Use GDI to draw a triangle:
var a = new System.Drawing.Point(5, 5);
var b = new System.Drawing.Point(50, 50);
var c = new System.Drawing.Point(5, 50);        
bmp
    .WithGDI()
    .Draw(dc => dc.DrawPolygon(System.Drawing.Pens.Red, new[] { a, b, c }));

// Use Imagesharp to save to PNG
bmp.Save("shannon.png", Codecs.ImageSharpCodec.Default);