BitmapSource Dpi Extension to scale dpi image to fit in the 32x32 inside Revit

AppScale.cs

using Autodesk.Revit.UI;
using ricaun.Revit.UI;

namespace RevitAddin.Forum.Revit
{
    [AppLoader]
    public class AppScale : IExternalApplication
    {
        private RibbonPanel ribbonPanel;
        public Result OnStartup(UIControlledApplication application)
        {
            ribbonPanel = application.CreatePanel("Image Scale Dpi");

            ribbonPanel.CreatePushButton<Commands.Command>("512").LargeImage = "Resources/DWG512.png".GetBitmapSource().ScaleDpi32();
            ribbonPanel.CreatePushButton<Commands.Command>("96").LargeImage = "Resources/DWG96.png".GetBitmapSource().ScaleDpi32();
            ribbonPanel.CreatePushButton<Commands.Command>("32").LargeImage = "Resources/DWG32.png".GetBitmapSource().ScaleDpi32();

            return Result.Succeeded;
        }

        public Result OnShutdown(UIControlledApplication application)
        {
            ribbonPanel?.Remove();
            return Result.Succeeded;
        }
    }
}

BitmapSourceDpiExtension.cs

using System.Windows.Media;
using System.Windows.Media.Imaging;

namespace RevitAddin.Forum.Revit
{
    public static class BitmapSourceDpiExtension
    {
        const int ICON_LARGE = 32;
        const int DEFAULT_DPI = 96;

        public static BitmapSource ScaleDpi32(this BitmapSource bitmapSource)
        {
            // Image properties
            int imageSize = bitmapSource.PixelWidth;
            PixelFormat imageFormat = bitmapSource.Format;
            int imageBytePerPixel = (int)(bitmapSource.Format.BitsPerPixel / 8);
            BitmapPalette palette = bitmapSource.Palette;

            // Adjustments
            int adjustedIconSize = ICON_LARGE;
            int adjustedDpi = DEFAULT_DPI;
            double screenScaling = (double)imageSize / adjustedIconSize;
            if (screenScaling < 1.0) screenScaling = 1.0;

            // Copying pixel data
            int stride = imageSize * imageBytePerPixel;
            int arraySize = stride * imageSize;
            byte[] imageData = new byte[arraySize];
            bitmapSource.CopyPixels(imageData, stride, 0);

            // Scaling
            int scaledSize = (int)(adjustedIconSize * screenScaling);
            int scaledDpi = (int)(adjustedDpi * screenScaling);

            //System.Console.WriteLine($"Size:{scaledSize} Dpi:{scaledDpi}");

            BitmapSource result = BitmapSource.Create(scaledSize, scaledSize,
                                                         scaledDpi, scaledDpi,
                                                         imageFormat,
                                                         palette,
                                                         imageData,
                                                         stride);
            return result;
        }
    }
}

The AppScale.cs uses the package ricaun.Revit.UI to help convert the image to BitmapSource.

The BitmapSourceDpiExtension.cs is based on the pyRevit implementation.

RevitAPI Forum: https://forums.autodesk.com/t5/revit-api-forum/scale-create-images-for-button-icons/td-p/12646642