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POWPF text rendering inconsistencies
 

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  1. POWPF text rendering inconsistencies
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    <p>WPF 4.0 notoriously fixed the <a href="http://blogs.msdn.com/b/text/archive/2009/08/24/wpf-4-0-text-stack-improvements.aspx" rel="nofollow noreferrer">blurry text issue</a>. Setting <code>TextOptions.TextFormattingMode="Display"</code> uses pixel hints to line up characters, which works really well to improve clarity.</p> <p>However, it does not work while the program is running as a Windows service in session 0; the text goes back to "Ideal" rendering, which at small sizes is completely unreadable. Below is a comparison of the two renderings.</p> <p>Not running as a service:</p> <p><img src="https://i.imgur.com/HDpmD.png" alt="Good text"></p> <p>Running as a service:</p> <p><img src="https://i.imgur.com/osEEA.png" alt="Good text"></p> <p>Rendering code:</p> <pre><code>//rtb is a RenderTargetBitmap //c is a FormatConvertedBitmap with rtb as it's source while (displayRunning) { if (lcd != null) { Dispatcher.Invoke(new ThreadStart(delegate() { if (dv == null) { dv = new DrawingVisual(); using (DrawingContext dc = dv.RenderOpen()) { dc.DrawRectangle(Brushes.White, new Pen(), new Rect(0, 0, 256, 64)); dc.Close(); } } rtb.Render(dv); rtb.Render((Visual)Content); //bitmap output just for testing PngBitmapEncoder e = new PngBitmapEncoder(); e.Frames.Add(BitmapFrame.Create(c)); using (FileStream f = File.Open("C:\\test.png", FileMode.Create)) e.Save(f); WriteableBitmap bitmapdata = new WriteableBitmap(c); srcdata = new byte[bitmapdata.BackBufferStride * bitmapdata.PixelHeight]; System.Runtime.InteropServices.Marshal.Copy(bitmapdata.BackBuffer, srcdata, 0, srcdata.Length); })); try { framesender.Send(new PicoLCDFrame(srcdata, lcd.OutputReportLength), lcd); } catch (NullReferenceException) { } // device was unplugged } Thread.Sleep(33); } </code></pre> <p>I realize there are no screen pixels for hints when rendering the fonts as a service, but shouldn't it get the pixel hints from the bitmap it is rendering to? Is there anything I can do about this?</p> <p><strong>EDIT:</strong> Apparently, it <em>IS</em> using pixel hints, but it is anti-aliasing for some reason. Below is the rendered bitmap before it is downsampled to 1 bits/pxel.</p> <p><img src="https://i.imgur.com/r5PS9.png" alt="Bad text again"></p> <p>I do have <code>TextOptions.TextRenderingMode="Aliased"</code> set and it seems that WPF is ignoring that when running as a service? It needs to be on to look good when downsampled. How can I force it?</p> <p><strong>EDIT2:</strong> It may have something to do with WPF rendering in Tier 0 (software mode) when running as a service and Tier 2 (hardware) when not.</p> <p><strong>EDIT3:</strong> On Windows XP, as a service, it renders like this:</p> <p><img src="https://i.imgur.com/caSdu.png" alt="Good, kinda"></p> <p>Notice the margin difference, the font size difference, and an otherwise perfect rendering. WTF?</p>
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