Phase 3: app icon (multi-resolution ICO + master PNG)
scripts/generate-icons.ps1 renders the icon programmatically with System.Drawing - rounded teal square (#0E7C66) with a stylized white hook glyph - at 16/24/32/48/64/128/256 px and assembles a proper multi-resolution Microsoft ICO. The PNG and ICO outputs land in resources/. The script is the source of truth; re-run after editing the design. GUI csproj uses ApplicationIcon for the EXE icon and embeds the .ico + .png as Resources so MainWindow and AboutDialog can use them via WPF's resource URI scheme. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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<#
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.SYNOPSIS
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Generates webhook-server.ico (multi-resolution) and webhook-server.png from
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a programmatic design. Re-run after changing Draw-Icon to refresh assets.
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.DESCRIPTION
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Renders the icon at 16/24/32/48/64/128/256 px using System.Drawing, then
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assembles a Microsoft-format ICO file with each size embedded as PNG. No
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external tools required.
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Design: a rounded-square teal background (#0E7C66) with a stylized white
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hook shape (a "J"-like curve with an arrow tip).
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#>
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[CmdletBinding()]
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param(
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[string]$OutputDir = (Join-Path $PSScriptRoot '..\resources')
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)
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$ErrorActionPreference = 'Stop'
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Add-Type -AssemblyName System.Drawing
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New-Item -ItemType Directory -Path $OutputDir -Force | Out-Null
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function New-IconBitmap([int]$size) {
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$bmp = New-Object System.Drawing.Bitmap $size, $size, ([System.Drawing.Imaging.PixelFormat]::Format32bppArgb)
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$g = [System.Drawing.Graphics]::FromImage($bmp)
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$g.SmoothingMode = [System.Drawing.Drawing2D.SmoothingMode]::AntiAlias
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$g.InterpolationMode = [System.Drawing.Drawing2D.InterpolationMode]::HighQualityBicubic
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$g.PixelOffsetMode = [System.Drawing.Drawing2D.PixelOffsetMode]::HighQuality
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# Background: rounded square in brand teal.
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$bgColor = [System.Drawing.Color]::FromArgb(0xFF, 0x0E, 0x7C, 0x66)
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$bgBrush = New-Object System.Drawing.SolidBrush $bgColor
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$radius = [int]($size * 0.22)
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$rect = New-Object System.Drawing.RectangleF 0, 0, $size, $size
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$path = New-Object System.Drawing.Drawing2D.GraphicsPath
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$d = $radius * 2
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$path.AddArc($rect.X, $rect.Y, $d, $d, 180, 90)
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$path.AddArc($rect.Right - $d, $rect.Y, $d, $d, 270, 90)
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$path.AddArc($rect.Right - $d, $rect.Bottom - $d, $d, $d, 0, 90)
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$path.AddArc($rect.X, $rect.Bottom - $d, $d, $d, 90, 90)
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$path.CloseFigure()
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$g.FillPath($bgBrush, $path)
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# Foreground: white hook shape - a thick curved stroke shaped like a "J"
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# tipped with an arrowhead, sized relative to the canvas.
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$fgColor = [System.Drawing.Color]::White
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$stroke = [Math]::Max(2, [int]($size * 0.12))
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$pen = New-Object System.Drawing.Pen $fgColor, $stroke
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$pen.StartCap = [System.Drawing.Drawing2D.LineCap]::Round
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$pen.EndCap = [System.Drawing.Drawing2D.LineCap]::Round
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$pen.LineJoin = [System.Drawing.Drawing2D.LineJoin]::Round
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# Hook curve: vertical down-stroke on the right, then a half-circle arc
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# curling to the left and ending in a small filled dot for the hook tip.
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$cx = [single]($size * 0.62)
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$top = [single]($size * 0.22)
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$bottom = [single]($size * 0.58)
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$arcD = [single]($size * 0.34) # arc diameter
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$arcLeft = [single]($cx - $arcD) # left edge of arc circle
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# Vertical stroke from (cx, top) to (cx, bottom).
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$g.DrawLine($pen, $cx, $top, $cx, $bottom)
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# Half-circle arc beneath: starts at (cx, bottom), curls to (cx - arcD, bottom).
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$arcRect = New-Object System.Drawing.RectangleF $arcLeft, ([single]($bottom - $arcD / 2)), $arcD, $arcD
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$g.DrawArc($pen, $arcRect, 0, 180)
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# Filled circle at the tip end of the arc.
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$tipR = [single]($stroke * 0.6)
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$tipX = $arcLeft
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$tipY = [single]($bottom)
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$brushFg = New-Object System.Drawing.SolidBrush $fgColor
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$g.FillEllipse($brushFg, [single]($tipX - $tipR), [single]($tipY - $tipR), [single]($tipR * 2), [single]($tipR * 2))
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$brushFg.Dispose(); $pen.Dispose(); $bgBrush.Dispose(); $path.Dispose()
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$g.Dispose()
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return $bmp
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}
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# Generate each size as PNG bytes. Hashtable keys are prefixed with "s" because
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# PowerShell hashtable lookups by integer key behave inconsistently with PSObject
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# wrapping; string keys round-trip cleanly.
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$sizes = @(16, 24, 32, 48, 64, 128, 256)
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$pngs = @{}
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foreach ($s in $sizes) {
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$bmp = New-IconBitmap $s
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$ms = New-Object System.IO.MemoryStream
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$bmp.Save($ms, [System.Drawing.Imaging.ImageFormat]::Png)
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$pngs["s$s"] = $ms.ToArray()
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$ms.Dispose()
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$bmp.Dispose()
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}
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# Save the master 256 PNG separately for places that need a transparent PNG.
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$pngPath = Join-Path $OutputDir 'webhook-server.png'
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[System.IO.File]::WriteAllBytes($pngPath, [byte[]]$pngs['s256'])
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# Assemble multi-resolution ICO.
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$icoPath = Join-Path $OutputDir 'webhook-server.ico'
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$ms = New-Object System.IO.MemoryStream
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$bw = New-Object System.IO.BinaryWriter $ms
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try {
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$count = $sizes.Count
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$bw.Write([UInt16]0) # idReserved
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$bw.Write([UInt16]1) # idType: 1 = ICO
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$bw.Write([UInt16]$count) # idCount
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# Directory entries (16 bytes each).
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$offset = 6 + 16 * $count
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foreach ($s in $sizes) {
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$bytes = $pngs["s$s"]
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$w = if ($s -ge 256) { 0 } else { $s }
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$h = if ($s -ge 256) { 0 } else { $s }
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$bw.Write([byte]$w) # width
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$bw.Write([byte]$h) # height
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$bw.Write([byte]0) # colorCount
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$bw.Write([byte]0) # reserved
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$bw.Write([UInt16]1) # planes
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$bw.Write([UInt16]32) # bitCount
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$bw.Write([UInt32]$bytes.Length)
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$bw.Write([UInt32]$offset)
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$offset += $bytes.Length
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}
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# Image data.
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foreach ($s in $sizes) { $bw.Write($pngs["s$s"]) }
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$bw.Flush()
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[System.IO.File]::WriteAllBytes($icoPath, $ms.ToArray())
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}
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finally {
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$bw.Dispose(); $ms.Dispose()
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}
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Write-Host "Wrote $icoPath ($((Get-Item $icoPath).Length) bytes)"
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Write-Host "Wrote $pngPath ($((Get-Item $pngPath).Length) bytes)"
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