[directfb-dev] Re: Help me please! About 4bits pixel format.

[James Su <suzhe@gnuchina.org>]

Hi,
Thank you for your help.

Ville Syrjäl wrote:

>On Fri, Dec 13, 2002 at 03:55:57PM +0800, James Su wrote:
>  
>
>>In my understanding, a surface
>>may occupy a block of memory itself or share a block of memory with
>>other surface, ie. a sub surface.
>>    
>>
>
>Well the only difference between "real" surfaces and sub surfaces is the
>way you create them. After that it's just business as usual.
>  
>
How about the memory layout? Could you please tell me how a surface 
memory looks like? Does sub surface have its own buffer?
I don't understand the internal of surface. Could you please give me 
some information?

>  
>
>>Am I right? Then, for example if I
>>alloc a sub surface from an odd x coordination within the father
>>surface, i.e. (3,4), the memory offset of the sub surface will be 1.5
>>bytes, but it's impossible!
>>    
>>
>
>Perhaps you can simply return DFB_INVAREA in those cases.
>
>  
>
You mean, I just restrict the surface boundary at even coordination? But 
I don't know if it's acceptable for user.

Regards
James Su




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