Your stride is incorrect. Stride is the number of bytes allocated for one scanline of the bitmap. Thus, use the following: int stride = ((RenderWidth * 32 + 31) & ~31) / 8; and replace the last parameter (currently 0) with stride as defined above. Here is an explanation for the mysterious stride formula: Fact: … Read more
You certainly have put in a lot of work on this. I think the main problem is that BitmapCacheOption.None doesn’t prevent the underlying BitmapDecoder(s) from being cached. There are several tricky solutions to this such as doing a GC.Collect(), loading 300 small images from 300 different Uris, and calling GC.Collect() again, but the simple one … Read more
It is possible to do without using unsafe code by using Bitmap.LockBits and copy the pixels from the BitmapSource straight to the Bitmap Bitmap GetBitmap(BitmapSource source) { Bitmap bmp = new Bitmap( source.PixelWidth, source.PixelHeight, PixelFormat.Format32bppPArgb); BitmapData data = bmp.LockBits( new Rectangle(Point.Empty, bmp.Size), ImageLockMode.WriteOnly, PixelFormat.Format32bppPArgb); source.CopyPixels( Int32Rect.Empty, data.Scan0, data.Height * data.Stride, data.Stride); bmp.UnlockBits(data); return bmp; }
Here is a method that (to my experience) is at least four times faster than CreateBitmapSourceFromHBitmap. It requires that you set the correct PixelFormat of the resulting BitmapSource. public static BitmapSource Convert(System.Drawing.Bitmap bitmap) { var bitmapData = bitmap.LockBits( new System.Drawing.Rectangle(0, 0, bitmap.Width, bitmap.Height), System.Drawing.Imaging.ImageLockMode.ReadOnly, bitmap.PixelFormat); var bitmapSource = BitmapSource.Create( bitmapData.Width, bitmapData.Height, bitmap.HorizontalResolution, bitmap.VerticalResolution, PixelFormats.Bgr24, null, … Read more