TextureBrush OutOfMemoryException with .NET Compact Framework 2.0

I encounterd TextureBrush OutOfMemoryException with .NET Compact Framework 2.0.

 

Environment:

           Visual Studio 2005 Team Suite / Japanese version.

           .NET Compact Framework 2.0 Service Pack 1

           Sharp W-ZERO3 WS004SH for the target machine.

          

By using TextureBrush with extensive FillPolygon results in OutOfMemoryException.

Forcing GC does not help.

I used the using pattern, and those instances should have no leak.

 

If I replace

                g.FillPolygon(textureBrush, drawArea);
          with g.FillRectangle(textureBrush, 0,0,100,100);

then, it works fine.

Therefore, it could be a potential bug of .NET Compact Framework 2.0.

 

I have checked out the same symptom by the Google and found a few people reported same issue.
But, there seems to be no solution yet.

—————–

// Run following code and wait for a few minutes, then results in the exception.

—————–

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace TextureBrushOutOfMemory1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            this.Invalidate();
        }

        private Bitmap backBuffer = null;
        Point[] drawArea = { new Point(10, 10), new Point(90, 10), new Point(90, 90), new Point(10, 90) };
        Bitmap bmp = null;
        Random rnd = new System.Random();

        private void Form1_Paint_1(object sender, PaintEventArgs e)
        {
            using (Graphics g = e.Graphics)
            {
                doPaint(sender, g);
            }
        }

        private void doPaint(object sender, Graphics gr)
        {
            // Make a new back buffer if needed.
            if (backBuffer == null)
            {
                backBuffer = new Bitmap(this.ClientSize.Width, this.ClientSize.Height);
            }

            if (bmp == null)
                bmp = new Bitmap(100, 100);

            // Create Image for TextureBrush
            using (Graphics g = Graphics.FromImage(bmp))
            using (SolidBrush redBrush = new SolidBrush(Color.Red))
            using (SolidBrush blueBrush = new SolidBrush(Color.Blue))
            {
                float val = 0.5F;
                g.FillRectangle(redBrush, 0, 0, 100, 100);
                for (int i = 0; i < rnd.Next(300); i++)
                {
                    g.FillRectangle(blueBrush, (int)(val * rnd.Next(100)), 100 – (int)(val * rnd.Next(100)), (int)(val * rnd.Next(50)), (int)(val * rnd.Next(50)));
                }
            }

            // FillPolygon on the backBuffer with textureBrush
            using (Graphics g = Graphics.FromImage(backBuffer))
            using (TextureBrush textureBrush = new TextureBrush(bmp))
            {
                g.FillPolygon(textureBrush, drawArea);
                // g.FillRectangle(textureBrush, 0,0,100,100);

                // FillRectangle works fine.
                // But, FillPolygon results in Out of Memory Exception.
            }
            // Force GC by GC.Collect() or WaitForPendingFinalizers() is not effective.
            GC.Collect();
            GC.WaitForPendingFinalizers();

            // Draw the backBuffer to the FormWindow
            gr.DrawImage(backBuffer, 0, 0);
        }

        protected override void OnPaintBackground(PaintEventArgs pevent)
        {
            // avoid flicker
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

    }
}