So, when using new QFont(...) I get "DLL freetype6 not found", or after some manipulations I get this:
System.BadImageFormatException: "Была сделана попытка загрузить программу, имеющую неверный формат. (0x8007000B)"
like "An attempt was made to load an incorrect format program"

code:
_myFont = new QFont("Fonts\\ARIAL.TTF", 72, new QFontBuilderConfiguration(true)); _drawing = new QFontDrawing();
full stack:
Unhandled exception. System.BadImageFormatException: Была сделана попытка загрузить программу, имеющую неверный формат. (0x8007000B) at SharpFont.FT.FT_Init_FreeType(IntPtr& alibrary) at SharpFont.Library..ctor() at QuickFont.FreeTypeFont..ctor(String fontPath, Single size, FontStyle style, Int32 superSampleLevels, Single scale) at QuickFont.QFont.GetFont(String fontPath, Single size, FontStyle style, Int32 superSampleLevels, Single scale) at QuickFont.QFont..ctor(String fontPath, Single size, QFontBuilderConfiguration config, FontStyle style) at SparkEngine.Program.OnLoad() in C:\Users\DimucaTheDev\source\repos\SparkEngine\Program.cs:line 316 at OpenTK.Windowing.Desktop.GameWindow.Run() at SparkEngine.Program.Run() in C:\Users\DimucaTheDev\source\repos\SparkEngine\Program.cs:line 231 at SparkEngine.Program.Main(String[] args_) in C:\Users\DimucaTheDev\source\repos\SparkEngine\Program.cs:line 192

Windows 11, NET 8
OpenTK, using Wayfinder.Quickfont nuget packet, latest version
Debug, X64
VC++ installed(2022)

tried to compile freetype6 myself, but i dunno how to get DLL instead of LIB

I am trying to use this nice project but get a "BadImageFormatException" right away.

Directly by calling "new QFont(font, size, new QFontBuilderConfiguration(true))"

title

I want to show a rectangle and some text on a GLControl panel，but it doesn't work，the panel only show the text. What should I do to slove it?

`//图形
GL.Disable(EnableCap.Texture2D);
GL.Color3(Color.Black);
GL.Begin(BeginMode.LineLoop);
GL.Vertex2(300, 100);
GL.Vertex2(300, 50);
GL.Vertex2(400, 50);
GL.Vertex2(400, 100);
GL.End();

qfont = new QFont("C:\Windows\Fonts\tahoma.ttf", 50, new QuickFont.Configuration.QFontBuilderConfiguration(true));
qdraw = new QFontDrawing();
qdraw.ProjectionMatrix = _projectionMatrix;
QFontRenderOptions textOpts;
textOpts = new QFontRenderOptions()
{
Colour = Color.Red, //Color.DarkRed, etc
DropShadowActive = false
};
qdraw.DrawingPrimitives.Clear();
qdraw.Print(qfont, "Hello world", new Vector3(100f,100f,0f), QFontAlignment.Left,textOpts);
qdraw.RefreshBuffers();
qdraw.Draw();
//Add this
qdraw.DisableShader();

glControl1.SwapBuffers();`

Hello, not sure if here is the best place to ask this, but is there any way to make the font scale according to it's bounding box?

When loading a font that is naturally monospaced it is not rendered.

Segoe UI.zip

Example using font attached:

Any Monospacing option makes no difference.

Ideally would use multi-channel signed distances fonts as outlined in https://github.com/Chlumsky/msdfgen.

A C# starting point for regular distance fields is here: https://github.com/cartman300/Flib/blob/master/Flib/DistanceField.cs

This will improve the creation of nuget packages and allow us to produce strong-name signed ones in conjunction with un-strong-name signed ones

How are fonts scaled? I don't see a mechanism for scaling the font size. When I added some scaling to the modelView matrix of a primitive, it translated as well as scaled the font. I'm not really sure why, there doesn't to be anything funky going on in the vertex shader. I can't modify the texture coordinates, as this obviously messes up the entire scheme, since all of the bimaps are located in one giant texture.

Hello,

I have been working on porting an old c application to c#. The application uses opengl to render some graphics in what I understand to be called immediate mode. (I'm clearly inexperienced with opengl). I'm trying to get a 1 to 1 port going before I make broad changes, but I do have to replace the font rendering code. I thought to use quickfont and running through the examples I got it to display text in the application. Unfortunately as soon as I draw text the immediate mode graphics that come afterward are no longer visible on the screen. I cannot figure out what I'm doing that causes this. Might be obvious to people accustomed to opengl, but that's not me :)

I made the test code below to show my problem. The first quad renders and the second does not unless I comment out the qfont code.

Hope someone can point met in the correct direction.

This is on .net Core 2.0 using a quickfont lib modified to work with that (using system.drawing compat library and removing the GDI stuff.

static void Main(string[] args)
        {
            // Workarround for current directory being the project folder not the debug folder.
            Directory.SetCurrentDirectory(Path.GetDirectoryName(Assembly.GetEntryAssembly().Location));

            INativeWindow window = new NativeWindow(
                640,
                480,
                "TestApp",
                GameWindowFlags.Default,
                GraphicsMode.Default,
                DisplayDevice.Default);
            window.Visible = true;
            
            IGraphicsContext context = new GraphicsContext(GraphicsMode.Default, window.WindowInfo);
            context.MakeCurrent(window.WindowInfo);
            (context as IGraphicsContextInternal).LoadAll();

            GL.ClearColor(Color4.Purple);
            GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);

            // This quad shows
            GL.Begin(PrimitiveType.Quads);

            GL.Color3(Color.Red);
            GL.Vertex2(0, 0);
            GL.Color3(Color.Blue);
            GL.Vertex2(0.9f, 0);
            GL.Color3(Color.Orange);
            GL.Vertex2(1, -0.9f);
            GL.Color3(Color.Green);
            GL.Vertex2(0, -1);

            GL.End();

            Matrix4 projectionMatrix = Matrix4.CreateOrthographicOffCenter(0, 640, 0, 480, -1.0f, 1.0f);

            // this text shows
            QFont font = new QFont(@"test_condensed_regular.ttf", 72, new QuickFont.Configuration.QFontBuilderConfiguration(true));
            QFontDrawing loadingText = new QFontDrawing();
            loadingText.Print(font, "Testing..", new Vector3(100, 300, 0), QFontAlignment.Left, new QFontRenderOptions() { Colour = (Color)new Color4(0.8f, 0.1f, 0.1f, 1.0f) });

            loadingText.RefreshBuffers();
            loadingText.ProjectionMatrix = projectionMatrix;
            loadingText.Draw();

            // This quad does not show unless I comment out the QFont code
            GL.Begin(PrimitiveType.Quads);

            GL.Color3(Color.Red);
            GL.Vertex2(0, 0);
            GL.Color3(Color.Blue);
            GL.Vertex2(0, 0.9f);
            GL.Color3(Color.Orange);
            GL.Vertex2(-0.9f, 1);
            GL.Color3(Color.Green);
            GL.Vertex2(-1, 0);

            GL.End();


            context.SwapBuffers();

            Console.WriteLine("Hello World!");
            Console.ReadKey();
        }

Since the font files contain kerning information, we should probably use that instead of calculating our own.

This should be possible to do relatively easily with SharpFont, however it will only be implemented for loading font paths (which go through FreeTypeFont).

It won't work for system (installed) fonts since they are loaded through GDIFont and don't expose kerning information. If there was a cross-platform way to get the path to the font file then it would be possible to load them using FreeTypeFont instead, but I don't think a way exists.

This will become easier to automate with #30

I am creating a CAD-like application. In the application, there needs to be numbers near a scale. I need the numbers to have always the same (screen) size independent of the current zoom. It uses a orthographic projection in this way CreateOrthographic(WindowWidth / ZoomScale, WindowHeight / ZoomScale, ZNear, ZFar); I set the matrix to the QFontDrawing.ProjectionMatrix. But now the text also gets scaled when the user zooms in. Is there a built-in way how to do this? Or do I have to do it myself using some matrix-magic?

The provided Examples in the Readme do not work. In addition to containing multiple spelling mistakes (such as "DrawingPimitiveses" instead of "DrawingPrimitives"), it contains multiple variables not mentioned or explained anywhere else. I tried replacing these variables with values that seem resonable to me however it does not work.

The included "Example" Folder is also not very useable in my opinion. In addition to the massive amount of different strings and other variables whose purpose is rather unclear to someone not familiar with this code, that hideous switch absolutely needs to go.

I think some sort of Documentation or Starter Guide is necessary.

Hello,

Thanks a lot for the Quickfont library. It helps me a lot.

I have some problems to embed Quickfont into an existing drawing context where lines an rectangles are drawn.

Every time I draw text like in the example all the other drawing primitives like lines and rectangles go away.

Here is my sample code (in the drawing routine):

QFont _myFont = null;

public void render()
{
         if (_myFont == null)
           {
                    QFontBuilderConfiguration fontConfig = new QFontBuilderConfiguration(false);

                    _myFont = new QFont(@"C:\Windows\Fonts\arial.ttf", 6, fontConfig);
                    _fontDrawing = new QFontDrawing();
         
                    // it does not matter if this part is inside the if section or not
                    _fontDrawing.DrawingPrimitives.Clear();
                    _fontDrawing.Print(_myFont, "This is my test text!", new Vector3(200, 200, 0), QFontAlignment.Left);
                    _fontDrawing.RefreshBuffers();
                }
  
 GL.Viewport(0, 0, (int)m_Viewport.GetDx(), (int)m_Viewport.GetDy());
  GL.Clear(ClearBufferMask.ColorBufferBit);
 GL.ClearColor(OpenTK.Graphics.Color4.CornflowerBlue);
 GL.Disable(EnableCap.Texture2D);

  // As a test just drawing a simple line over the screen             
  GL.MatrixMode(MatrixMode.Projection);
  GL.LoadIdentity();

  int dx1 = (int)m_Viewport.GetDx();
  if (dx1 < 1) dx1 = 1;
  int dy1 = (int)m_Viewport.GetDy();
  if (dy1 < 1) dy1 = 1;
  GL.Ortho(0, dx1, dy1, 0, 0.0f, 100.0f);

  GL.MatrixMode(MatrixMode.Modelview);
  GL.LoadIdentity();

  // this line is not visible :(
  GL.Color4(1.0, 0.0, 1.0, 1.0);
  GL.LineWidth(8.0f);
  GL.Begin(BeginMode.Lines);
  GL.Vertex3(100.0f, 100.0f, 0.0f);
  GL.Vertex3(1000.0f, 600.0f, 0.0f);
  GL.End();

  GL.Enable(EnableCap.Texture2D);
  _fontDrawing.VertexArrayObject.EnableAttributes();
  _fontDrawing.ProjectionMatrix = Matrix4.CreateOrthographicOffCenter(0, (int)m_Viewport.GetDx(), 0, 
  (int)m_Viewport.GetDy(), 0.0f, 100.0f);
   _fontDrawing.Draw();

  SwapBuffers();
}

I found out that it has something to do when the Shading is enabled. What is the best way to do this? Did I forget something.

Thanks alot for any help.

Best regards

Happe

thank you for your quickfont library！It makes me easier to complete the task.
Nowadays,I copy Sh0rti's code for test. It can normally display opentk window.
but when I modify the text by chinese character.It does't work, the window display the background color.
how can I do to display chinese character in opentk window?

In OpenTK 3.0.1 the signature of GL.BlendFunc changed. The enums are BlendFactor instead of BlendFactorSrc and BlendFactor instead of BlendFactorDest

Update the call QFontDrawing accordingly:

if (_useDefaultBlendFunction)
            {
                GL.Enable(EnableCap.Blend);
                GL.BlendFunc(BlendingFactor.SrcAlpha, BlendingFactor.OneMinusSrcAlpha);
            }

The System.Drawing namespace always causes problems with Mono, and while QuickFont works okay now, it is a good idea to move away from System.Drawing altogether.

The following is a list of ways System.Drawing is used in the current codebase, and a replacement:

Hi,
This is a wonderful library. I want use it to render Chinese. But it seems characterset don't containt chinese.
So is it possible to support chinese characterset ?
Thanks.

I am trying to use this library in an application that allows the user to (repeatedly) open and close an OpenTK window. When the window closed the OpenTK and QuickFont are disposed. The second time the window is created the library fails to render properly because 'SharedState' is pointing to disposed resources. I did a quick fix locally to publicly expose the setter on QFontDrawing SharedState property. When disposing of QuickFont I also set _drawing.SharedState to null. This resolved my issue but perhaps there is a more elegant fix. If this change would be accepted I can send a merge request.

QFontDrawing.Print is reliant on OpenTK.Vector3, which is not a valid type. OpenTK.Mathematics.Vector3 is the correct binding.

Is it possible to implement one of the following text rendering methods?

http://wdobbie.com/post/gpu-text-rendering-with-vector-textures

https://medium.com/@evanwallace/easy-scalable-text-rendering-on-the-gpu-c3f4d782c5ac

It's probably worth explaining what font rendering technique you use (and perhaps why this approach was chosen) in the README.

From what I can gather it seems to be traditional rasterization, rather than SDF or more obscure vector techniques.

Update Dependency for Nuget Package from OpenTK.Next to OpenTK 2.0 Release

OpenTK Released 2016-09-23

Mono's MeasureString library does not return a very good estimate of the actual string size, which means that when the glyphs are measured precisely, the size is larger than the MeasureString size. This leads to glyphs not fitting on the texture page when they are packed, and so they are never assigned.

Was a different issue.