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launcher: QR code + share buttons on host ready panel

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The single Copy button left it on the user to format a message and
get the code into Discord/email. Added a layout that makes sharing
obvious:

- QR encodes the join code text so a friend with a phone can scan
  the host's screen and forward the code without typing it
- "Copy as message" formats a one-line "Join {server} on DorkNet!
  Download at github.com/... and paste this code:" pitch
- "Email to friend" opens the default mail client with subject +
  body prefilled, code in the body
- QR built via QRCoder -> WriteableBitmap directly (no
  System.Drawing dependency); palette matches the launcher
This commit is contained in:
Alexa
2026-05-27 11:11:31 +03:00
parent 3039bebc6c
commit 3aa0b55512
4 changed files with 150 additions and 15 deletions
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launcher/Backend/QrCodeRenderer.cs
+60
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using System.Windows.Media;
using System.Windows.Media.Imaging;
using QRCoder;
namespace DorkNet.Launcher.Backend;
/// <summary>Turns a join-code string into a WPF <see cref="BitmapSource"/>
/// using QRCoder's raw module matrix. We render the matrix directly to a
/// <see cref="WriteableBitmap"/> rather than going through PNG bytes so we
/// avoid pulling in System.Drawing.Common (Windows-only, slated for
/// trimming in cross-platform .NET).
///
/// <para>Colour choice matches the launcher palette: white (Ink) modules
/// on the deep purple-navy (BgDeeper) background so the QR is legible
/// against the dark panel.</para></summary>
public static class QrCodeRenderer
{
public static BitmapSource Render(string text, int pixelSize = 220)
{
// QRCodeGenerator -> QRCodeData (matrix of bools) -> WriteableBitmap.
using var gen = new QRCodeGenerator();
using var data = gen.CreateQrCode(text, QRCodeGenerator.ECCLevel.M);
var modules = data.ModuleMatrix;
var moduleCount = modules.Count;
if (moduleCount == 0)
throw new InvalidOperationException("QR generation produced an empty matrix.");
// Scale up to the requested pixel size — int division so each
// module is an exact pixel count (avoids subpixel blur). Quiet
// zone (4-module margin) is part of QRCodeData already.
var moduleSize = Math.Max(1, pixelSize / moduleCount);
var dim = moduleCount * moduleSize;
var bmp = new WriteableBitmap(dim, dim, 96, 96, PixelFormats.Bgra32, null);
var stride = dim * 4;
var pixels = new byte[dim * stride];
// Light pixel = Ink (#F7F3FF), dark pixel = BgDeeper (#0E0A1F).
// Order is BGRA in the buffer.
var light = new byte[] { 0xFF, 0xF3, 0xF7, 0xFF };
var dark = new byte[] { 0x1F, 0x0A, 0x0E, 0xFF };
for (int y = 0; y < moduleCount; y++)
for (int x = 0; x < moduleCount; x++)
{
var on = modules[y][x];
var src = on ? dark : light;
for (int py = 0; py < moduleSize; py++)
for (int px = 0; px < moduleSize; px++)
{
var offset = ((y * moduleSize + py) * stride) + ((x * moduleSize + px) * 4);
Buffer.BlockCopy(src, 0, pixels, offset, 4);
}
}
bmp.WritePixels(new System.Windows.Int32Rect(0, 0, dim, dim), pixels, stride, 0);
bmp.Freeze();
return bmp;
}
}