How to Compare 2 HDC with an error of 1% give or take

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Hello all,

I am having a hard time, searching one HDC within another HDC. I have been able to do it if the pixels are all the same.
How do I set the comparison to give me an error of lets say 1%?
Here is the the portion of the compare logic for each pixel:

C++

for(int y = 0; y < Rect_To_Compare.bottom; ++y) {
    for(int x = 0; x < Rect_To_Compare.right; ++x) {
        COLORREF Color = ::GetPixel(DlgDC, (x + Rect_To_Compare.left), (y + Rect_To_Compare.top) );
        COLORREF ColorToCompare = ::GetPixel(BitmapDC,x,y);
        if(Color != ColorToCompare) {
            result = false;
        }
    }
}

Any help would be greatly appreciated.

Posted 18-May-12 12:25pm

FISH786

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Sergey Alexandrovich Kryukov 18-May-12 19:01pm

Just one word: Wow! :-)
--SA

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Sergey Alexandrovich Kryukov · Accepted Answer · 2012-05-18T13:00:00

Solution 1

Don't you see that the "error" result (which, by the way, makes very little sense) depends on the pixels found by each HDC?! Set aside ridiculous performance of this code. So, this question makes no sense at all.

I really, really hope you're going to understand this.

—SA

Posted 18-May-12 13:00pm

Sergey Alexandrovich Kryukov

Updated 18-May-12 13:01pm

v2

Comments

FISH786 18-May-12 19:08pm

You right. I am having perfomance issue and am just searching on BITMAPINFO. I guess, I have work cut out for me on reading. I was expecting a quick resolution before I finished reading. Guess not going to happen.
BTW the above code works as part of a function, its just slow. not just slow VERY SLOW. So yes you right with WOW! :(

Sergey Alexandrovich Kryukov 28-May-12 17:00pm

If you are agree, please accept this answer formally (green button) -- thanks.
--SA