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2014-07-17
, 00:05
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Posts: 485 |
Thanked: 708 times |
Joined on Feb 2010
@ Galiza
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#12
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Originally Posted by pichlo
PowerVR SGX530 is the GPU present in Nokia N900 & N9.
Thanks. I was suspecting something like that. Can you provide a chapter and verse, please? I was looking for that but could not find it. Also, pardon my ignorance, but what is SGX 530?
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2014-07-17
, 00:39
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Posts: 6,445 |
Thanked: 20,981 times |
Joined on Sep 2012
@ UK
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#13
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OK, case closed, thanks to all who replied. FYI, the problem was QGLWidget. Replacing it with QWidget not only solved the problem but also made the redrawing much faster. The program also starts faster and is a bit smaller. All win, no lose.
| The Following User Says Thank You to pichlo For This Useful Post: | ||
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2014-07-17
, 00:46
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Posts: 2,448 |
Thanked: 9,523 times |
Joined on Aug 2010
@ Wigan, UK
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#14
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Originally Posted by pichlo
Yeah, I was going to ask if you were using QGLWidget for performance reasons (hardware acceleration). I have found in the past that using a QGLWidget for the viewport when rendering QGraphicsItems on the N900 is actually slower than using a plain QWidget.
OK, case closed, thanks to all who replied. FYI, the problem was QGLWidget. Replacing it with QWidget not only solved the problem but also made the redrawing much faster. The program also starts faster and is a bit smaller. All win, no lose.
__________________
'Men of high position are allowed, by a special act of grace, to accomodate their reasoning to the answer they need. Logic is only required in those of lesser rank.' - J K Galbraith
My website
GitHub
'Men of high position are allowed, by a special act of grace, to accomodate their reasoning to the answer they need. Logic is only required in those of lesser rank.' - J K Galbraith
My website
GitHub
| The Following User Says Thank You to marxian For This Useful Post: | ||
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2014-10-18
, 21:38
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Posts: 6,445 |
Thanked: 20,981 times |
Joined on Sep 2012
@ UK
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#15
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To continue with silly questions, I have a need to scroll an area only a few hundred pixels high but potentially a hundred million or more pixels wide. Has anyone tried that? I've only gone as high as a couple million and my device rebooted while initializing the area. Presumably the damn watchdog again. Any idea how to implement kinetic scrolling myself?
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2014-10-18
, 21:44
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Posts: 6,436 |
Thanked: 12,699 times |
Joined on Nov 2011
@ Ängelholm, Sweden
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#16
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implement dynamic buffering yourself
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2014-10-19
, 11:22
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Posts: 5,028 |
Thanked: 8,613 times |
Joined on Mar 2011
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#17
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Originally Posted by pichlo
Out of curiosity, what is it? The hundred millions pixels wide thing?
To continue with silly questions, I have a need to scroll an area only a few hundred pixels high but potentially a hundred million or more pixels wide.
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N900's aluminum backcover / body replacement
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N900's HDMI-Out
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Camera cover MOD
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Measure battery's real capacity on-device
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TrueCrypt 7.1 | ereswap | bnf
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Hardware's mods research is costly. To support my work, please consider donating. Thank You!
N900's aluminum backcover / body replacement
-
N900's HDMI-Out
-
Camera cover MOD
-
Measure battery's real capacity on-device
-
TrueCrypt 7.1 | ereswap | bnf
-
Hardware's mods research is costly. To support my work, please consider donating. Thank You!
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2014-10-20
, 08:36
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Posts: 6,445 |
Thanked: 20,981 times |
Joined on Sep 2012
@ UK
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#18
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@coderus, that's what I kinda hoped to avoid. Doing that, I may as well implement the whole thing myself. Which I may have to do anyway since I need the vertical scroll bar on the left and for the life of me can't figure out how to persuade stock QScrollArea to do that.
@Estel, can you think of any application when you may need to plot a long graph with a narrow vertical range?
@Estel, can you think of any application when you may need to plot a long graph with a narrow vertical range?
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2014-10-20
, 08:42
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Posts: 6,436 |
Thanked: 12,699 times |
Joined on Nov 2011
@ Ängelholm, Sweden
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#19
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@pichlo you need dynamic plotting indeed. Drawing whole thing and keeping it in memory in some "scrollable" is VERY bad idea 
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2014-10-20
, 13:10
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Posts: 1,548 |
Thanked: 7,510 times |
Joined on Apr 2010
@ Czech Republic
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#20
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The QtQuick 2.0 Canvas supports tiled rendering - maybe check how it is implemented (I looked at its source and it is quite readable 
) for inspiration ?
) for inspiration ?
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modRana: a flexible GPS navigation system
Mieru: a flexible manga and comic book reader
Universal Components - a solution for native looking yet component set independent QML appliactions (QtQuick Controls 2 & Silica supported as backends)
modRana: a flexible GPS navigation system
Mieru: a flexible manga and comic book reader
Universal Components - a solution for native looking yet component set independent QML appliactions (QtQuick Controls 2 & Silica supported as backends)
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Edit: Never mind, I found it. Thanks again!
Last edited by pichlo; 2014-07-17 at 00:06.