Re: Lots of data

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#12059

From: Hans Galema
Date: Thu, 01 Jan 2004 13:46

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M. Finch wrote:

> In drawing my test file, I have a small bitmap that I've found (120x100) to
> display.  I've tried Bitblt to dispay the 160 points, but it took a few
> seconds to go through the 160 points in the list to display them.

>   HDC hdcMem = CreateCompatibleDC(NULL);
>   HBITMAP hbmT = SelectBitmap(hdcMem,hbm);
> 
>   BITMAP bm;
>   GetObject(hbm,sizeof(bm),&bm);
> 
>   BitBlt(hdc,0,0,bm.bmWidth,bm.bmHeight,hdcMem,0,0,SRCCOPY);

These are four functioncalls for every point ?

What I do not understand that you would create a HDC and get an
object for every point to be drawn. The only thing that would
change is the position where you would draw your small bitmap.
But for me that position is obscure from your code.

You could try to measure the time needed for the BitBlt() call
only. What would be the time for 160 BitBlt() calls?

You could have a look at CopyRect too.

Hans.

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