Graphics.DrawImage is slow?

[Cesar Ronchese]

Hey!

I'm printing some stuff in a memory-created bitmap (format
Imaging.PixelFormat.Format16bppRgb565) and, at the end, copying the bitmap
to graphic device of my UserControl.

I noticed that method is not too fast to draw from my memory bitmap. In
medium, is taking 0.015 seconds to execute on a Pentium 2.26 GH, 512 RAM,
Windows 2K, with almost 1024x768 resolution area.

There are some advice concerning speed up it?

Cesar


Ps.: piece of code:

mBmp = New Bitmap(Me.Width, Me.Height,
Imaging.PixelFormat.Format16bppRgb565)
g = Graphics.FromImage(mBmp)
(...)
e.Graphics.DrawImage(mBmp, New Point(0, 0))
g.Dispose()

 

[Herfried K. Wagner [MVP]]

I'm printing some stuff in a memory-created bitmap (format
Imaging.PixelFormat.Format16bppRgb565) and, at the end, copying the bitmap
to graphic device of my UserControl.

I noticed that method is not too fast to draw from my memory bitmap. In
medium, is taking 0.015 seconds to execute on a Pentium 2.26 GH, 512 RAM,
Windows 2K, with almost 1024x768 resolution area.

Use 'DrawImageUnscaled' if no scaling should be performed.

 

[Cesar Ronchese]

Yeah, I used that too. But that 0.015 seconds still almost the same.

I'm printing some stuff in a memory-created bitmap (format
Imaging.PixelFormat.Format16bppRgb565) and, at the end, copying the bitmap
to graphic device of my UserControl.

I noticed that method is not too fast to draw from my memory bitmap. In
medium, is taking 0.015 seconds to execute on a Pentium 2.26 GH, 512 RAM,
Windows 2K, with almost 1024x768 resolution area.

Use 'DrawImageUnscaled' if no scaling should be performed.

 

[Guest]

If you want speed, you can copy a bitmap image to another bitmap using the
WinAPI bitblt function...it's very quick.