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Color and Pallete entry

Posted on 2002-06-02
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Last Modified: 2013-11-20
I have an application that has the display come with a custome color pallete:

PALETTEENTRY ColourEntries[276];

When I get the color at the cursor by:

COLORREF PixelAtPointer = dc.GetPixel( point );

How to reference the COLORREF against the PALETTEENTRY ? I want to find the index of the pixel color in the pallete entry.

Thanks
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Question by:ahtri
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5 Comments
 
LVL 23

Expert Comment

by:Roshan Davis
ID: 7050407
Use the Macros with the COLORREF for getting each color value

the macros are GetRValue(crf);GetGValue(crf);etc.

PALLETTEENTRY gives the bytes of the RGB,

So you can either combine these rgb value and compare with COLORREF , or split the COLORREF and compare with the pallette entry.


GOOD LUCK
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Author Comment

by:ahtri
ID: 7050419
how to split the COLORREF ? can you give me some sample code
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LVL 23

Expert Comment

by:Roshan Davis
ID: 7050424
COLORREF PixelAtPointer = dc.GetPixel( point );


BYTE byteRVal = GetRValue(PixelAtPointer);


GOOD LUCK
0
 

Author Comment

by:ahtri
ID: 7050440
I'm struggling to understand this code:

ShortRed=ColourEntries[i+20].peRed/8;     ShortGreen=ColourEntries[i+20].peGreen/4;
ShortBlue=ColourEntries[i+20].peBlue/8;

ColourIndex[i]=ShortRed*2048+ShortGreen*32+ShortBlue;

Do you have any idea about those "8", "4", "32", "2048" ?
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LVL 23

Accepted Solution

by:
Roshan Davis earned 50 total points
ID: 7050452
First one is splitting the COLORREF


And

second one is combining this for making the COLORREF

Roshmon
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