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freeimage() needed before copyimage()
Posted: Wed May 29, 2024 6:02 am
by jassing
Let's say #image1 is an image, but I issues CopyImage(#image2, #image1) --- is the memory automatically freed, or should I be calling freeimage 1st?
Re: freeimage() needed before copyimage()
Posted: Wed May 29, 2024 7:31 am
by Bisonte
Clean programming means: If you take something, you give it back when it is no longer needed.
A programming language cannot see into the programmer's head to guess what he is going to do next.
But in this case : If #Image1 is a fixed number (and not created with #PB_Any) then it is released.
At least that's what everyone has said so far...
(translated by DeepL.com)
Re: freeimage() needed before copyimage()
Posted: Wed May 29, 2024 7:45 am
by boddhi
Hello,
Code: Select all
Enumeration
#image1
#Image2
EndEnumeration
; Example 1 : When #Image2 doesn't exist
CreateImage(#image1,50,50)
CopyImage(#image1,#Image2)
Debug IsImage(#Image2)
; Example 2 : When #Image2 already exists
ResizeImage(#Image2,1,1)
CopyImage(#image1,#Image2)
Debug IsImage(#Image2)
Re: freeimage() needed before copyimage()
Posted: Wed May 29, 2024 8:25 am
by mk-soft
PB-Help:
https://www.purebasic.com/documentation ... jects.html
- An object that is associated with an index is automatically freed when reusing that index.
Re: freeimage() needed before copyimage()
Posted: Wed May 29, 2024 12:23 pm
by jassing
Bisonte wrote: Wed May 29, 2024 7:31 am
Clean programming means: If you take something, you give it back when it is no longer needed.
Yes, I understand that. Yet, purebasic does some things "automatically" ... I realized I hadn't free'd the images, and wondered if I needed to go back into the code and change it. I don't regularly work with images... I was hoping copyimage would free the destination if it exists.
Bisonte wrote: Wed May 29, 2024 7:31 am
A programming language cannot see into the programmer's head to guess what he is going to do next.
However, if you're copying #iamge1 to #image2 - the language could know #image2 is no longer needed.
Re: freeimage() needed before copyimage()
Posted: Wed May 29, 2024 12:24 pm
by jassing