[Lazarus] Fast drawing to canvas

[Hans-Peter Diettrich]

Graeme Geldenhuys schrieb:

> A quick test on my system, using my own "animation" images.
> 
>   * using the fpGUI toolkit
>   * Each BMP image is 140kb (fpGUI doesn't have PNG support yet)
>   * each image is loaded one-by-one. No images are cached.
>   * just before a new image is loaded, the old image is freed.
>   * Partition has the ReiserFS filesystem under Linux 64-bit
>   * hard drive is an avg Seagate 250GB sata drive.
> 
> Initial framerate was 1500 fps.  I couldn't actually see any animation
> at that speed, and had to add writeln(i) statements to make sure I am
> loading all images - which it did. :-)

This may be the problem: you should force the display of every loaded 
image. Only then it's guaranteed that all conversions are performed, 
required to show the images on screen.


> I'll wait for your sample images before I take another look. But from
> my initial testing, there is something seriously screwy in your case
> to get only 11fps. I can't imagine loading a 40kb PNG vs a 140kb BMP
> can make up that a huge difference in framerate.

Hardware support may be a bottleneck. Can you disable graphics hardware 
acceleration on your system?

Many graphics adapters require proprietary drivers for hardware 
acceleration, which are not installed by default on Linux systems.

DoDi