[2005] graphics question

[.paul.]

i got this floodfill code from the internet, but its too slow.

Public Sub FloodFill(ByVal bm As Bitmap, ByVal x As _
    Integer, ByVal y As Integer, ByVal new_color As Color)
        ' Get the old and new colors.
        Dim old_color As Color = bm.GetPixel(x, y)

        ' Start with the original point in the stack.
        Dim pts As New Stack(100)
        pts.Push(New Point(x, y))
        bm.SetPixel(x, y, new_color)

        ' While the stack is not empty, process a point.
        Do While pts.Count > 0
            Dim pt As Point = DirectCast(pts.Pop(), Point)
            If pt.X > 0 Then SafeCheckPoint(bm, pts, pt.X - 1, _
                pt.Y, old_color, new_color)
            If pt.Y > 0 Then SafeCheckPoint(bm, pts, pt.X, pt.Y _
                - 1, old_color, new_color)
            If pt.X < bm.Width - 1 Then SafeCheckPoint(bm, pts, _
                pt.X + 1, pt.Y, old_color, new_color)
            If pt.Y < bm.Height - 1 Then SafeCheckPoint(bm, _
                pts, pt.X, pt.Y + 1, old_color, new_color)
        Loop
    End Sub

    Private Sub SafeCheckPoint(ByVal bm As Bitmap, ByVal pts As _
        Stack, ByVal x As Integer, ByVal y As Integer, ByVal _
        old_color As Color, ByVal new_color As Color)
        Dim clr As Color = bm.GetPixel(x, y)
        If clr.Equals(old_color) Then
            pts.Push(New Point(x, y))
            bm.SetPixel(x, y, new_color)
        End If
    End Sub

does anyone know of a faster way to floodfill an area?

[circuits2]

I'm not sure what you mean by "floodfill". Can you elaborate on what you are actually trying to do?

[.paul.]

i'm trying to change a region of same colored pixels to a different color

[circuits2]

Is your region restricted by a certain perimeter or does it apply to an entire bitmap..... or both?

[.paul.]

its a paint program.
the region could be any shape, part or complete bitmap.

[circuits2]

Either way, it is going to have to loop through all of the pixels in the region. If you want to speed it up a little, consolidate your code into a single method. You're losing speed by leaving the loop to process another method. Also, avoid creating variables for data that you already have, whenever possible.