fillRect() is not supporting

[amit_yadav]

Hello,
I come across fillRect() problem on Samsung GT s5250.
When I test below snippet of code

  graphics.setColor(0xFF0000);
  graphics.fillRect(0, 0, getWidth(), getHeight());

It's glitches; mean screen is not painting properly.
Anyway, I got workaround for that is fillRoundRect(); below snippet of code working as such

g.fillRoundRect(0, 0, getWidth(), getHeight(),0,0);

But still I have a anxiety about it.
Is it because of device firmware?
If, then how I get it from J2ME;please don't let me know about "microedition.platform".
Since, we can't get it using this.

Hope I have been elaborated my problem up to understanding level.

In brief, I would like to say that fillRect() is not painting as such whereas fillRoundRect() is.

Cheers,
Amit

[grahamhughes]

Can you fillRect() a small shape? Say, (0, 0, 10, 10)?

Graham.

[amit_yadav]

Hello Graham,
It has been observed that with "fillRoundRect()" it's working fine! Whereas with "fillRect" it paints screen in a different way like;
If you paint a area with (10, 10) or (20, 20) then instead smooth painting we can be able to see lots of small square with in it (might be they are pixels) and
If you paint with (50, 50) then after a particular height it draw a line also in a specified region.
But if we do that same with "fillRoundRect() with arc value 0,0; we will get a single square/rectangle what we desire.

Hope it'll be helpful in order to explain my problem.




Amit.

[grahamhughes]

If you paint a area with (10, 10) or (20, 20) then instead smooth painting we can be able to see lots of small square with in it (might be they are pixels)

If you're seeing a kind of "chessboard" pattern, of two very similar colours, this is quite common on older Samsung devices, so it doesn't surprise me that it's still a problem. You will probably find that some colours do paint a smooth, solid area.

Hope it'll be helpful in order to explain my problem.

The explanation is simple: the implementation of fillRect() on that device is buggy. This is a pretty familiar experience to anyone porting to Samsung devices.

The fix... well, the fix is to find another method of drawing a rectangle that works. It sounds like you've found one. There will be other techniques, such as using drawLine(), drawImage(), drawRGB(), fillTriangle(), etc. Then, replace every call to fillRect() with your replacement code fragment. This is the same process for coping with any defective API implementation.

Some strategies for dealing with issues like this are described in the wiki.

Graham.

[amit_yadav]

Hello Graham,
It’s really great that you have visualized and put your experienced concern over it without any snapped of it; I agree with it! And yes we'll have to go with workaround "fillRoundRect()".
One thing more, sometimes I have been seen to be fixed a particular problem (related to Interrupt/sound/Graphics etc) with firmware update. Since I would like to know that is there any approach to get device firmware?

Amit.

[grahamhughes]

Some manufacturers (for some devices) provide firmware updates directly to end users. For some, you will need to download an update utility (see the manufcaturers website) and connect the device to your computer, while newer phones support FOTA (Firmware Over The Air). For other devices, you may need a commercial relationship with the manufacturer in order to get the updates.

Bear in mind that, if the device has an operator-specific firmware (and, most do), you might be able to update it only with an update from (or approved by) the operator.

Also, you must factor-in your company's policy on supporting firmware versions.

Graham.

[amit_yadav]

Hello Graham,
Frankly speaking I don't have a much more knowledge on firmware to ask further on it.
At least with in your word

If you're seeing a kind of "chessboard" pattern, of two very similar colours, this is quite common on older Samsung devices, so it doesn't surprise me that it's still a problem.

I have come to know what's the problem is.
Thanks a Lot!

Amit.