[Lazarus] Fast drawing to canvas

[dhkblaszyk at zeelandnet.nl]

Hi Graeme, 

I will test the app you made on Mac as well. On
Windows I think the performance will be similar now. 

As for the delay
in startup, don't worry that is the file cache being created. It's not
more than a stream of raw pixel data for each frame and a simple list of
stream references for each frame. In my "new" version which is also in
CCR this loading is actually pretty fast now. It takes a sec or 2 to
setup. I'm sure this could be improved, but that is only a minor problem
for now. 

Regards, Darius 

On 10 feb '12, Graeme Geldenhuys wrote: 

>
2012/2/9 Darius Blaszyk :
> 
>> I've put up the test app on the CCR. All
three methods draw at roughly 10fps on windows and 6fps on mac.
> 
>
Using your project as-is, I get 9fps under Linux. Also I have a 10-20
>
seconds delay just for the program to start up - I didn't investigate
>
this.
> 
> I then went and modified your TImage code to look as shown
below...
> Basically this is so I can do a direct comparison to my fpGUI
test
> project. It now loads 1.5Mbyte BMP versions of your images. This
gives
> me a 7fps animation. Yuck! Oh, and I had to enable double
buffering,
> otherwise I would have gone into shock. ;-)
> 
>
----------------------------
> procedure TForm1.mnuTImageClick(Sender:
TObject);
> var
> s: TDateTime;
> i: integer;
> j: integer;
> f:
boolean;
> begin
> PageControl1.ActivePage := ImageTabSheet;
> 
> s :=
Now;
> for i := 1 to 23 do
> begin
>
Image1.Picture.LoadFromFile(Format('./images_50/%.4d.bmp', [i]));
>
Application.ProcessMessages;
> end;
> 
> AddTestToListBox('TImage', 23 /
((Now - s) * 24 * 3600));
> end;
> ----------------------------
> 
> So
this got me thinking. We already know that fcl-image really really
>
sucks at loading images from disk. fpGUI proves with it's own JPG and
>
BMP loading code, that it could be done in a fraction of the time it
>
takes fcl-image.
> 
> So to prove this point further, I quickly
implement PNG support in
> fpGUI, by using the fcl-image loading code,
and populating a TfpgImage
> instead. Now my fpGUI based animation test
can use BMP, JPG and PNG
> images.
> 
> The result....using 50% HD
images.
> 
> BMP (native) in fpGUI.... 100fps
> JPG (native) in fpGUI...
37fps
> PNG (via fcl-image) in fpGUI.... 8fps
> 
> So this clearly shows
one huge bottleneck... Loading via fcl-image is
> very bad! The FPC team
really needs to investigate this further.
> 
> Unfortunately I haven't
implemented native PNG loading in fpGUI yet,
> but you are welcome to
port the BMP or JPG code to your LCL
> application. This shouldn't be
hard, because the code doesn't have
> much to do with GUI toolkits.
Though that means your images need to be
> converted too - which I
gather you would rather not want to do.
> 
> My fpGUI animation test
project and the image samples can be
> downloaded from the following
URL. If your ISP bans DynamicDNS sites,
> email me in private and I'll
send it to you directly.
> 
>
http://opensoft.homeip.net:8080/~graemeg/animation_test.tar.gz [1]
(2Mb)

  

Links:
------
[1]
http://opensoft.homeip.net:8080/~graemeg/animation_test.tar.gz
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