static Rect CropCapturedBitmap()

in ExampleGallery/Infrastructure/ThumbnailGenerator.xaml.cs [401:435]
25 lines of code
9 McCabe index (conditional complexity)

            static Rect CropCapturedBitmap(CanvasBitmap capturedBitmap, Color[] pixelColors)
            {
                Debug.Assert(capturedBitmap.Dpi == 96, "The following code mixes up DIPs and pixels in ways that are only valid if these units are the same.");

                Rect rect = capturedBitmap.Bounds;
                uint stride = capturedBitmap.SizeInPixels.Width;

                // Crop transparent pixels from the left of the bitmap.
                while (rect.Width > 1 && ArePixelsTransparent(pixelColors, stride, (int)rect.X, (int)rect.Y, 1, (int)rect.Height))
                {
                    rect.X++;
                    rect.Width--;
                }

                // Crop transparent pixels from the top of the bitmap.
                while (rect.Height > 1 && ArePixelsTransparent(pixelColors, stride, (int)rect.X, (int)rect.Y, (int)rect.Width, 1))
                {
                    rect.Y++;
                    rect.Height--;
                }

                // Crop transparent pixels from the right of the bitmap.
                while (rect.Width > 1 && ArePixelsTransparent(pixelColors, stride, (int)rect.X + (int)rect.Width - 1, (int)rect.Y, 1, (int)rect.Height))
                {
                    rect.Width--;
                }

                // Crop transparent pixels from the bottom of the bitmap.
                while (rect.Height > 1 && ArePixelsTransparent(pixelColors, stride, (int)rect.X, (int)rect.Y + (int)rect.Height - 1, (int)rect.Width, 1))
                {
                    rect.Height--;
                }

                return rect;
            }