Pixel edit slow
lazarus / 39-Graphics

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xinyiman · 2019-12-27 15:05

Hi guys, I wrote a little test program to understand how to quickly
manipulate the pixels of a bitmap. But I didn't understand what I'm
wrong because it's very slow.
I attach the example.

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winni · 2019-12-27 16:56

Hi!

First recognize that you are dealing with 2 mio Pixels, that are 8 mio
bytes!
20 years ago that would have taken minutes!

And the second: TBitmap is know to be slow, but it works with all
widget sets.

If you want to speed up your graphics then read this:

 https://wiki.lazarus.freepascal.org/Developing_with_Graphics

And take time to read!

Wi0nni

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xinyiman · 2019-12-28 17:54

Thanks
Quote from: winni on December 27, 2019, 05:56:24 pmHi!

First recognize that you are dealing with 2 mio Pixels, that are 8 mio
bytes!
20 years ago that would have taken minutes!

And the second: TBitmap is know to be slow, but it works with all
widget sets.

If you want to speed up your graphics then read this:

 https://wiki.lazarus.freepascal.org/Developing_with_Graphics

And take time to read!

Wi0nni