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''' <summary>
''' Let any source image glow.
''' Copyright by Timo Boehme, www.goldengel.ch
''' </summary>
''' <param name="bmSrc">An bitmap with image. Example 64x64 Pixel icon.</param>
''' <returns>A brighten sourceimage with some glowing like effekt.</returns>
''' <remarks>'*1) Variant: Check out to let some channels at zero. For example only take
''' the green channel to change the luminance.</remarks>
Public Function CreateGlowingImage(ByVal bmSrc As Bitmap) As Bitmap
Dim i As Integer 'Helper
Dim m As Integer 'Bytes per Pixel to work with
Dim R1, G1, B1 As Integer 'Source Red, Green, Blue
Dim R2, G2, B2 As Integer 'Result Red, Green, Blue
Dim D As Integer 'luminance to add
Dim L As New List(Of Point) 'List to store areas to widen
Dim Pt As Point 'point helper
'if no image is available, we can not do anything
If bmSrc Is Nothing Then Return Nothing
Dim bm As Bitmap = bmSrc.Clone 'Lets us make a copy. Not nessesary but will keep away support questions.
'convert any image indexed image into an RGB24 image
If bm.PixelFormat <> Drawing.Imaging.PixelFormat.Format32bppArgb And bm.PixelFormat <> Drawing.Imaging.PixelFormat.Format24bppRgb Then
Dim Bm2 As New Bitmap(bm.Width, bm.Height, Drawing.Imaging.PixelFormat.Format24bppRgb)
Using gr As Graphics = Graphics.FromImage(Bm2)
gr.DrawImage(bm, New Point(0, 0))
End Using
bm = Bm2
End If
'unlock the image data for reading and writing
Dim bts As Drawing.Imaging.BitmapData
bts = bm.LockBits(New Rectangle(0, 0, bm.Width, _
bm.Height), Drawing.Imaging.ImageLockMode.ReadWrite, bm.PixelFormat)
'bytes per pixel (default = 3 for 24BPP images)
m = 3
If bm.PixelFormat = Drawing.Imaging.PixelFormat.Format32bppArgb Then m = 4
'change the luminance for each pixel
Dim X, Y As Integer
For Y = 0 To bm.Height - 1
For X = 0 To bm.Width - 1
Pt = New Point(X, Y)
i = ((Y * bts.Stride) + (X * m))
R1 = System.Runtime.InteropServices.Marshal.ReadByte(bts.Scan0, i + 2) 'Red
G1 = System.Runtime.InteropServices.Marshal.ReadByte(bts.Scan0, i + 1) 'Green
B1 = System.Runtime.InteropServices.Marshal.ReadByte(bts.Scan0, i + 0) 'Blue
D = 50
If L.Contains(Pt) Then
D = 80
L.Remove(Pt)
End If
'brighten up the image
R2 = Global.System.Math.Min(255, R1 + D) '*1
G2 = Global.System.Math.Min(255, G1 + D) '*1
B2 = Global.System.Math.Min(255, B1 + D) '*1
System.Runtime.InteropServices.Marshal.WriteByte(bts.Scan0, i + 2, CByte(R2))
System.Runtime.InteropServices.Marshal.WriteByte(bts.Scan0, i + 1, CByte(G2))
System.Runtime.InteropServices.Marshal.WriteByte(bts.Scan0, i + 0, CByte(B2))
If (R1 + G1 + B1) > (200 + 200 + 200) Then
L.Add(New Point(X, Y + 1))
L.Add(New Point(X + 1, Y))
L.Add(New Point(X + 1, Y + 1))
End If
Next
Next
bm.UnlockBits(bts)
Return bm
End Function
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