Load image from EmbeddedResource

[drum445]

Before submitting a new issue, please verify and check:

• [x] The issue is specific to Raylib-cs and not raylib
• [x] I checked there is no similar issue already reported
• [x] My code has no errors or misuse of Raylib-cs

Issue description

I would like to be able to load an image file using embedded resources and convert this to a Raylib_cs.Image/Texture

Environment

Code example

My current code:

var myStream = Program.game.GetType().Assembly.GetManifestResourceStream(path);
var image = System.Drawing.Image.FromStream(myStream);

return Raylib.LoadTextureFromImage(image);

Throws the error:

error CS1503: Argument 1: cannot convert from 'System.Drawing.Image' to 'Raylib_cs.Image'

There may already be a way to do this, but I couldn't find one in the examples or looking at the lib's code. The Go raylib library provides a NewImageFromImage function that converts a native go Image into a Raylib one, so something like that would probably do

Thanks

[9ParsonsB]

would #113 fix your issue, or would you require the use of embedded resources?

[drum445]

That does look interesting thanks, but I ideally want to be able to embed all my resources into a single stand-alone executable and deploy that way

[9ParsonsB]

You could always combine the files after building (e.g. copy /b Game.exe + Resources.rres GameWithResources.exe) and then split them up again at runtime by looking for the rres Magic Bytes (HEX: 72 72 65 73).

I am currently developing an rres parser for use with Raylib-cs, so I will take this use-case under consideration

[rgebee]

It might be possible to convert it to a raylib Image by creating it directly. You need to check the pixel format matches and make sure the data is unmanaged. Not sure how to get the raw data from a System.Drawing.Image though.

[drum445]

@ChrisDill the System.Drawing.Image wasn't for any particular reason, it was just the way I'm currently loading an image from disk. Any way where I can go from an embedded file to a raylib image would be top cheers

[JupiterRider]

@drum445 Yes, there is a way:

using System;
using Raylib_cs;
using System.Reflection;
using System.Runtime.InteropServices;

static class Program
{
    static void Main(string[] args)
    {
        Raylib.SetConfigFlags(ConfigFlags.FLAG_VSYNC_HINT);
        Raylib.InitWindow(1280, 720, "Demo Game");

        Texture2D texture;

        using (var stream = Assembly.GetExecutingAssembly().GetManifestResourceStream("DemoGame.icon.png")!)
        {
            using (var memoryStream = new MemoryStream())
            {
                stream.CopyTo(memoryStream);

                var image = LoadImageFromMemory(".png", memoryStream.ToArray(), (int)memoryStream.Length);
                texture = Raylib.LoadTextureFromImage(image);
                Raylib.UnloadImage(image);
            }
        }

        while (!Raylib.WindowShouldClose())
        {
            Raylib.BeginDrawing();
            Raylib.ClearBackground(Color.BEIGE);
            Raylib.DrawTexture(texture, 0, 0, Color.WHITE);
            Raylib.EndDrawing();
        }

        Raylib.UnloadTexture(texture);
        Raylib.CloseWindow();
    }

    [DllImport("raylib", CallingConvention = CallingConvention.Cdecl)]
    static extern Image LoadImageFromMemory(string fileType, byte[] fileData, int dataSize);
}

Once you have added your Image as embedded resource in your csproj ...

  <ItemGroup>
    <EmbeddedResource Include="icon.png" />
  </ItemGroup>

... you can load it like above. The "original" LoadImageFromMemory takes a pointer. If you don't want to mess with them, you can write your own method:

    [DllImport("raylib", CallingConvention = CallingConvention.Cdecl)]
    static extern Image LoadImageFromMemory(string fileType, byte[] fileData, int dataSize);

[rgebee]

@JupiterRider Thanks for sharing! Though your example shouldn't load the image with managed memory as the image data and functions around it assume the data to be unmanaged.

[drum445]

@JupiterRider cheers for that, it seems to be working well.

Many thanks 👍