Dim Ncp As ColorPalette = Bm.Palette



From a test I ran I think that the above statement does not cause Ncp to 
reference Bm.Palette but instead produces a new palette and Ncp points to 
it.



Is that true?

If so, is the new palette a clone of Bm.Palette?



Thanks

" active"  wrote in message 
news:uOwaTUgzHHA.5052@TK2MSFTNGP04.phx.gbl...

> Dim Ncp As ColorPalette = Bm.Palette
>
>
>
> From a test I ran I think that the above statement does not cause Ncp to 
> reference Bm.Palette but instead produces a new palette and Ncp points to 
> it.
>
>
>
> Is that true?
>
> If so, is the new palette a clone of Bm.Palette?


Yes, it copies the palette. In order to change the bitmap's palette you need 
to pass it back in. I have not tested but presumably this code would do 
nothing:

bm.Palette[0] = Color.Red;

Michael

"Michael C"  wrote in message 
news:O7XnD1kzHHA.3400@TK2MSFTNGP03.phx.gbl...

>" active"  wrote in message 
>news:uOwaTUgzHHA.5052@TK2MSFTNGP04.phx.gbl...
>
....
>  In order to change the bitmap's palette you need to pass it back in.


What did you mean by this?


thanks

" active"  wrote in message 
news:uslHPOlzHHA.3564@TK2MSFTNGP04.phx.gbl...

>>  In order to change the bitmap's palette you need to pass it back in.
>
> What did you mean by this?


Dim ncp As ColorPalette = Bm.Palette
ncp[0] = Color.Red
Bm.Palette = ncp; //<----- Passing back in

Michael

That will work?
If Bm.Palette returns a reference to a copy of the palette, rather than a 
reference to the bitmap's palette, seems that Bm.Palette = ncp would not 
change the bitmap's palette, but the thing Bm gives out as a palette.


Am I wrong?

thanks


"Michael C"  wrote in message 
news:uVD6awlzHHA.2484@TK2MSFTNGP06.phx.gbl...

>" active"  wrote in message 
>news:uslHPOlzHHA.3564@TK2MSFTNGP04.phx.gbl...
>>>  In order to change the bitmap's palette you need to pass it back in.
>>
>> What did you mean by this?
>
> Dim ncp As ColorPalette = Bm.Palette
> ncp[0] = Color.Red
> Bm.Palette = ncp; //<----- Passing back in
>
> Michael
> 

" active"  wrote in message 
news:OajXcLmzHHA.2484@TK2MSFTNGP06.phx.gbl...

> That will work?
> If Bm.Palette returns a reference to a copy of the palette, rather than a 
> reference to the bitmap's palette, seems that Bm.Palette = ncp would not 
> change the bitmap's palette, but the thing Bm gives out as a palette.


When you pass the palette back in via the Palette property it will replace 
the bitmap's palette. The palette is likely stored in a block of memory that 
represents the bitmap, when you retrieve the palette it would copy data from 
memory into the palette object. When you pass in a palette it will copy data 
from that palette back into that block of memory, hence replacing the 
palette for the bitmap.

Michael

That clears it up.

thanks

"Michael C"  wrote in message 
news:%23Nis0AnzHHA.3400@TK2MSFTNGP03.phx.gbl...

>" active"  wrote in message 
>news:OajXcLmzHHA.2484@TK2MSFTNGP06.phx.gbl...
>> That will work?
>> If Bm.Palette returns a reference to a copy of the palette, rather than a 
>> reference to the bitmap's palette, seems that Bm.Palette = ncp would not 
>> change the bitmap's palette, but the thing Bm gives out as a palette.
>
> When you pass the palette back in via the Palette property it will replace 
> the bitmap's palette. The palette is likely stored in a block of memory 
> that represents the bitmap, when you retrieve the palette it would copy 
> data from memory into the palette object. When you pass in a palette it 
> will copy data from that palette back into that block of memory, hence 
> replacing the palette for the bitmap.
>
> Michael
>