QPixmap reading

[been_1990]

What's faster? Read a pixmap saved to a file, or read one from a file?

[nish]

i m sorry but both of your questions are one and the same. try to rephrase

[been_1990]

Read a pixmap saved to a file:
I read a pixmap saved inside an .xml file.
Ex:
<?xml version="1.0"?>
<pixmap>
01010110011001010101001
01001001001001010100100
</pixmap>

Read a pixmap from a file:
Ask QT to grab the icon from explorer.exe, and make a QPixmap out of it.

[Lykurg]

Read a pixmap saved to a file:
I read a pixmap saved inside an .xml file.
Ex:
<?xml version="1.0"?>
<pixmap>
01010110011001010101001
01001001001001010100100
</pixmap>

Sorry, but who does such thing? It's "stupid", why not easily save it in the original file format or any other better.

Read a pixmap from a file:
Ask QT to grab the icon from explorer.exe, and make a QPixmap out of it.

Don't understand. What icon? Do you mean a normal image file, which lays on your hard disk? If so, that's the way!

[been_1990]

I mean an applications icon retrieved with QFileIconProvider .

[nish]

if you are only concerned with speed... just do a test yourself

QTime time;
time.start();
Read_a_pixmap_saved_to_a_file();
qDebug<<"Time taken = "<<time.elapsed()<<"ms";
 
time.restart();
Read_a_pixmap_from_a_file();
qDebug<<"Time taken = "<<time.elapsed()<<"ms";

QTime time;
time.start();
Read_a_pixmap_saved_to_a_file();
qDebug<<"Time taken = "<<time.elapsed()<<"ms";

time.restart();
Read_a_pixmap_from_a_file();
qDebug<<"Time taken = "<<time.elapsed()<<"ms";

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[been_1990]

Ok. But wich one would use less system resources?

[nish]

ultimately you will read the same amount of data (image) from any method.

[been_1990]

Ok. If thats the case... Thanks.