What are some ways to utilize Windows GDI functions in .NET that are not available in GDI+?

I need assistance in accessing a GDI method that seems to be missing in GDI+ within my .NET application.

Specifically, I am looking for information on this particular method which retrieves kerning pairs for a specified font. My goal is to incorporate kerning (letter-spacing) into HTML5 canvas, even though it is not currently supported. I believe extracting kerning pairs on my server and providing a kerning table to the client would be the best approach.

Could someone guide me on how to utilize Windows library functions like this from within .NET?

c#javascript.netgdikerning

Answer №1

If you're looking to utilize this technique, check out the Windows API for implementing it:

  • 1 : Include the System.Runtime.InteropServices namespace in your project

  • 2 : Incorporate the API class into your project and utilize the GetKerningPairs method. Remember that this function relies on a struct called KERNINGPAIR, so it must be properly defined in our class to avoid compilation errors!

    class API
{
    [DllImport("gdi32.dll")]
    static extern uint GetKerningPairs(IntPtr hdc, uint nNumPairs,
    [Out] KERNINGPAIR[] lpkrnpair);

    [StructLayout(LayoutKind.Sequential)]
    struct KERNINGPAIR
    {
        public ushort wFirst; // could potentially be defined as char
        public ushort wSecond; //could potentially be defined as char
        public int iKernAmount;

        public KERNINGPAIR(ushort wFirst, ushort wSecond, int iKernAmount)
        {
            this.wFirst = wFirst;
            this.wSecond = wSecond;
            this.iKernAmount = iKernAmount;
        }

        public override string ToString()
        {
            return (String.Format("{{First={0}, Second={1}, Amount={2}}}", wFirst, wSecond, iKernAmount));
        }
    }
}

You can now access this method through the API class.

Answer №2

It seems like you might be facing a bit of trouble.

As mentioned on this forum thread

There doesn't seem to be specific classes for kerning pairs. Glyphs will provide default values for glyph indices and advance widths.

You could potentially give pinvoke a try, but as stated in the post,

Keep in mind: it looks like the data returned is limited to the default unicode block.

There might be a method to access more information by changing the code page (just my speculation).

The only way I've found to obtain ALL kerning data is by directly parsing the files; definitely not an easy task.

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