Following test:
A directory containing 450 images
A simple Delphi program loop that does, for testing, not more than simply calling
gflLoadThumbnail for each of those images (no more action than this call)
--> Processing time: 38 seconds
(playing around with various parameter settings i found no speed impact here).
_versus_
- xnview loading the thumbnails for the same directory
*** using no cache (Options|Browser|Cache|Enable caching = off)
*** using no embedded thumbnails (Options|Browser|Thumbnail|Use embedded thumbnail = off)
--> Processing time: 11 seconds
Please help me to understand the reason for this drastic speed difference
(gflLoadThumbnail 3 to 4 times slower than xnview) so that i can see if i did an error
and have a hint or direction how to fix that.
Many thanks for your help in advance!
klaus 2
please help to understand: speed gflLoadThumbnail vs. xnview
Moderators: helmut, XnTriq, xnview
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klaus2
yes Pierre, already tried
lp.Flags := GFL_LOAD_SKIP_ALPHA;
lp.Flags := lp.Flags or GFL_LOAD_PREVIEW_NO_CANVAS_RESIZE;
but that does not make any noticeable difference:
.
466 objects
- xnview (without cache !, without use embedded thumbnails !)
-> 17 seconds
- delphi pg using gflLoadThumbnail without loadparam GFL_LOAD_PREVIEW_NO_CANVAS_RESIZE
-> 32 seconds
- delphi pg using gflLoadThumbnail _with_ loadparam GFL_LOAD_PREVIEW_NO_CANVAS_RESIZE
-> 30,9 seconds
.
Thats very frustrating. So the basic question is:
is the prog using the libgfl function gflLoadThumbnail expected to run at comparable speed with xnview ?
Many thanks for clarification,
klaus2
lp.Flags := GFL_LOAD_SKIP_ALPHA;
lp.Flags := lp.Flags or GFL_LOAD_PREVIEW_NO_CANVAS_RESIZE;
but that does not make any noticeable difference:
.
466 objects
- xnview (without cache !, without use embedded thumbnails !)
-> 17 seconds
- delphi pg using gflLoadThumbnail without loadparam GFL_LOAD_PREVIEW_NO_CANVAS_RESIZE
-> 32 seconds
- delphi pg using gflLoadThumbnail _with_ loadparam GFL_LOAD_PREVIEW_NO_CANVAS_RESIZE
-> 30,9 seconds
.
Thats very frustrating. So the basic question is:
is the prog using the libgfl function gflLoadThumbnail expected to run at comparable speed with xnview ?
Many thanks for clarification,
klaus2
gflLoadThumbnail & xnview use same basic function, so it's strange...klaus2 wrote:yes Pierre, already tried
lp.Flags := GFL_LOAD_SKIP_ALPHA;
lp.Flags := lp.Flags or GFL_LOAD_PREVIEW_NO_CANVAS_RESIZE;
but that does not make any noticeable difference:
.
466 objects
- xnview (without cache !, without use embedded thumbnails !)
-> 17 seconds
- delphi pg using gflLoadThumbnail without loadparam GFL_LOAD_PREVIEW_NO_CANVAS_RESIZE
-> 32 seconds
- delphi pg using gflLoadThumbnail _with_ loadparam GFL_LOAD_PREVIEW_NO_CANVAS_RESIZE
-> 30,9 seconds
.
Thats very frustrating. So the basic question is:
is the prog using the libgfl function gflLoadThumbnail expected to run at comparable speed with xnview ?
You have not GFL_LOAD_HIGH_QUALITY_THUMBNAIL?
You try on jpeg file?
Pierre.
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klaus2
Hi Pierre,
no high quality ... as told:
lp.Flags := GFL_LOAD_SKIP_ALPHA;
lp.Flags := lp.Flags or GFL_LOAD_PREVIEW_NO_CANVAS_RESIZE;
Glad to hear that gflLoadThumbnail & xnview use same basic function!
very interested to find out the culprit!
Nearly all files are jpegs.
For to achieve the 32 seconds, i already involve 5 threads .. else it would take much more.
the only speedup i saw is to replace the libgfl by Delphi native jpeg VCL (-> ca 19 seconds)
but that's really not what i want to do.
May it be the case that using the dll slows it down much compared with a static lib?
Any hint or recommendation is very welcome!
Best regards,
klaus2
PS: hopefully it is ok for you: i sent you by mail a simplified testcase (with source) that does not more
than looping on all ico/bmp/jpg files on a selected directory, calling glfLoadThumbnail for those files
and showing the overall processing time.
So, using on a large directory, you could tell me if that is the processing time you would expect
compared with xnview and what possibly goes wrong here.
My test system is a Win98 pc.
no high quality ... as told:
lp.Flags := GFL_LOAD_SKIP_ALPHA;
lp.Flags := lp.Flags or GFL_LOAD_PREVIEW_NO_CANVAS_RESIZE;
Glad to hear that gflLoadThumbnail & xnview use same basic function!
very interested to find out the culprit!
Nearly all files are jpegs.
For to achieve the 32 seconds, i already involve 5 threads .. else it would take much more.
the only speedup i saw is to replace the libgfl by Delphi native jpeg VCL (-> ca 19 seconds)
but that's really not what i want to do.
May it be the case that using the dll slows it down much compared with a static lib?
Any hint or recommendation is very welcome!
Best regards,
klaus2
PS: hopefully it is ok for you: i sent you by mail a simplified testcase (with source) that does not more
than looping on all ico/bmp/jpg files on a selected directory, calling glfLoadThumbnail for those files
and showing the overall processing time.
So, using on a large directory, you could tell me if that is the processing time you would expect
compared with xnview and what possibly goes wrong here.
My test system is a Win98 pc.
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LuisR
Same problem to me...
I've tried to do the same thing (thumbnail loading) with Delphi7 & WinXP and it takes so much time to create/display the thumbnails.
I'm using the the demo that comes with GFL SDK for Delphi...
Any ideias to fix this?
Thanks in advance
I'm using the the demo that comes with GFL SDK for Delphi...
Any ideias to fix this?
Thanks in advance
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klaus2
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klaus2
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