Re: [platform-swt-dev] Color mask issues with PalleteData

[Silenio Quarti <Silenio_Quarti@xxxxxxxxxx>]

I believe this is how Windows expects
masks when the BITMAPINFOHEADER
field  biCompression
is
BI_RGB. 

Silenio

lipe! <lipeandrade@xxxxxxxxx>
Sent by: platform-swt-dev-bounces@xxxxxxxxxxx

10/10/2006 09:11 AM

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Subject	[platform-swt-dev] Color mask issues with PalleteData

Hi all,

I have noticied "strange" behavior with SWT PalleteData and different
color Depths.

With a 16 bit-color display, PalleteData uses a mask with 5 bit per color
and the representation orientation is RGB, from most significant bit to
less significant bit. Also, the not used bits are all at the left. 
 
-------------------------------------------------
Image depth: 16
Direct pallete: true
-
     Black: 00000000000000000000000000000000
       Red: 00000000000000000
111110000000000
     Green: 00000000000000000000001111100000
      Blue: 00000000000000000000000000011111
     White: 00000000000000000111111111111111 
-------------------------------------------------

 

But with a 32 bit-color display, PalleteData uses a mask with 8 bit per
color and representation orientation is BGR, from most significant bit
to less significant bit. And here, the not user bits are all at the right!

-------------------------------------------------
Image depth: 32
Direct pallete: true
-
     Black: 00000000000000000000000000000000
       Red: 0000000000000000
1111111100000000
     Green: 00000000111111110000000000000000
      Blue: 11111111000000000000000000000000
     White: 11111111111111111111111100000000 
-------------------------------------------------

 

The question is: there is any good reason to color-bits orientation changing
from a color-depth to another?!
 
 
The code snippet used to generate this report is attached
(i using SWT 3.2 / JDK 1.5).

 

Thanks for any explanation,



-- 
[ ]s,
Felipe Santos Andrade
<lipeandrade@xxxxxxxxx>
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Attachment: ColorTest.java
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