[GEM-dev] pix buffer improvements

[IOhannes m zmoelnig]

Georg Holzmann wrote:
> Hallo!
> 
>> (i consider the pix_buffer-objects very much like the table-objects 
>> within pd: you don't tell [tabwrite] to load a file into a table, 
>> rather you send the request directly to the table (or use a 
>> specialized object))
> 
> okay, now I understand how you are thinking ;)
> should I implement it to pix_buffer or have you already done it?

it is already in the CVS

> 
> 
>> the problem with your solution is, that it crashes as soon, as you 
>> delete the associated [pix_buffer] object.
>>
>> to fix this, you _have_ to do a pd_findbyclass() each and everytime 
>> you access the data behind it.
> 
> no, you dont have to :)

no you have to

> because the pixBlock is stored in the class - so I only must use 
> pd_findbyclass() when the index changes of course ... (and I didn't do 
> that)
> (file attached)

while you are copying the struct-data into your local pixBlock, the 
actual pixel-data is stored in the [pix_buffer] (using 
copy2imageStruct() instead of copy2Image()) and it is freed when 
pix_buffer is deleted.

just open the example patch in examples/2.advanced load the buffer, 
change the index and delete the [pix_buffer] object.

i always tried with "auto 1"

mfg.asd.r
IOhannes