C# WinForms - Anyone know of a C# GDI library not SLOW GDI+
GDI+ is very slow, almost entirely software whereas GDI is highly hardware accelerated. GDI+ is what the Graphics class uses on WinForms and it's just too slow.
Has anyone made a .NET GDI library so we can have the speed?
[EDIT] Many people are recommending OpenGL/DirectX. A requirement of mine is client compatibility especially remote desktop. AFAIK remote desktop does not support OGL/DirectX out of the box.[/EDIT]
Answer
Text rendering in GDI+ is slower than GDI. Microsoft realized this after .NET 1.1.
That is why .NET 2.0 contains a new TextRenderer class that wraps GDI DrawText. It has two static methods:
In .NET 2.0, all WinForm controls were converted to use TextRenderer, instead of:
- Graphics.MeasureString
- Graphics.DrawString
(provided you turn off UseCompatibleTextRendering)
Drawing a Bitmap is also slow in GDI+, that is why you use CachedBitmap. It draws very speedy.
A CachedBitmap object stores a bitmap in a format that is optimized for display on a particular device. To display a cached bitmap, call the Graphics::DrawCachedBitmap method.
graphics.DrawCachedBitmap(bitmap, 0, 0);