gdi+ Graphics::DrawImage really slow~~

Question

I am using a GDI+ Graphic to draw a 4000*3000 image to screen, but it is really slow. It takes about 300ms. I wish it just occupy less than 10ms.

Bitmap *bit         


        

Answer 1

If you're using GDI+, the TextureBrush class is what you need for rendering images fast. I've written a couple of 2d games with it, getting around 30 FPS or so.

I've never written .NET code in C++, so here's a C#-ish example:

Bitmap bmp = new Bitmap(...)
TextureBrush myBrush = new TextureBrush(bmp)

private void Paint(object sender, PaintEventArgs e):
{
    //Don't draw the bitmap directly. 
    //Only draw TextureBrush inside the Paint event.
    e.Graphics.FillRectangle(myBrush, ...)
}