You can lock the bitmap data and use pointers to manually set the values. It’s much faster. Though you’ll have to use unsafe code.
public override void PaintPoint(Layer layer, Point position)
{
// Rasterise the pencil tool
// Assume it is square
// Check the pixel to be set is witin the bounds of the layer
// Set the tool size rect to the locate on of the point to be painted
m_toolArea.Location = position;
// Get the area to be painted
Rectangle areaToPaint = new Rectangle();
areaToPaint = Rectangle.Intersect(layer.GetRectangle(), m_toolArea);
Bitmap bmp;
BitmapData data = bmp.LockBits(new Rectangle(0, 0, bmp.Width, bmp.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
int stride = data.Stride;
unsafe
{
byte* ptr = (byte*)data.Scan0;
// Check this is not a null area
if (!areaToPaint.IsEmpty)
{
// Go through the draw area and set the pixels as they should be
for (int y = areaToPaint.Top; y < areaToPaint.Bottom; y++)
{
for (int x = areaToPaint.Left; x < areaToPaint.Right; x++)
{
// layer.GetBitmap().SetPixel(x, y, m_colour);
ptr[(x * 3) + y * stride] = m_colour.B;
ptr[(x * 3) + y * stride + 1] = m_colour.G;
ptr[(x * 3) + y * stride + 2] = m_colour.R;
}
}
}
}
bmp.UnlockBits(data);
}