Dirty edges on ios 7.0.3

Dro

Here I have a problem with some edges.
The case - png image has only white pixels, but sparrow draw it with little bit of gray.
I can't understand this. Happens on real iphone only (ios7). iPad surprisingly works fine. Also everything's good on simulator.

here's an example http://pix.academ.org/img/2013/10/26/b7cdcd5b7d289ab19233158af0f4bd73.png

arrow - cross - circle. look closely.

it happens even on bitmap text fields

I was using not the last but recent Sparrow
rolled back to 2.0.1 - same problem

Daniel

That's definitely some premultiplied-alpha problem. (Xcode preprocesses the PNGs by multiplying the alpha value into the RGB values.)

On devices, does this only happen on iOS 7, or also on other iOS versions?

Dro

for now I can see this only on real iphone 5 ios7 (7.0.3)
all good on ipad ios 6, ipod 5 ios 6, simulator any os and on iphone 4 ios7 (version to be determined)

Is it possible to prevent such changes for all 7.x.x versions? or they still changing a lot?
Xcode 5.0.1
Mavericks Dev Preview

Dro

iphone4 with 7.0.2 was ok.
7.0.3 - has the same problem.

Daniel

7.0.2 works, but 7.0.3 doesn't? *sigh*. What is it with that crappy GLKTextureLoader class?!

Could you upload a sample graphic somewhere? Then I'll see what I can do.

Dro

yes. this is from atlas

https://www.dropbox.com/s/o9xfnj8f6jago8j/lm%402x.png
https://www.dropbox.com/s/gom436l8hkuawvq/lm%402x.xml

atlas is entirely white. I use color property in Sparrow. the arrow is "menu-zen-arrow"

I actually CAN see this problem in Imbrium on same device. But it's not so noticeable.

jbernabeu

I have the same problem with iPad 3 in iOs 7.0.3. Everything was working great before update ...

The same image before and after update in the same iPad 3

http://pix.academ.org/img/2013/10/26/82e71ed11169f6776913c6fe697941fc.png

I hope this will help you ...

aowenb

I think the problem is with the expectedPmaValueForFile method in SPTexture.

Perhaps XCode no longer pre-processes png files in the root directory for ios 7.0.3?

As a temporary fix, I forced pma to be false in the optionsForPath method in SPTexture

BOOL usePma = false;//pma && [self expectedPmaValueForFile:path];

jbernabeu

aowenb,

that works great for me !!!!

Daniel

I'll probably dump GLKTextureLoader to get rid of those problems. Give me a little time, then this should be solved.

TTStu

Ooh ouch, another one here waiting for a fix!

I think I've been lucky with my choice of colours that I got away with this.

Thanks for the work around aowenb, it works!

Can anyone think of a *negative* effect of using the BOOL usePma fix?

Jonkel

Breaks the premultiplied alpha in simulator if you hard set it to false, and according to the comments in the function assets in the root folder could have issues with it?

I changed aowenb's code to
BOOL usePma = pma;//pma && [self expectedPmaValueForFile:path];

and I haven't seen any issues so far (including the simulator) and he hasn't complained about it so. 😛

Dro

For me it's still not fixed on simulator
and also 7.0.3 works fine with this but 7.0.2 - has white edges.

hcabral

Thanks for the workaround, aowenb! Worked for me.

Dro

BOOL usePma = false
works on 7.0.3. white borders on 7.0.2 and simulator

BOOL usePma = pma
black borders on 7.0.3. has not yet been tested in other cases but for me it's broken 🙈

hcabral

Dro, you're right, the simulator is still broken with the work around. =/ Couldn't test an actual device with 7.0.2 yet, any feedback?

Dro

yes. 7.0.2 is actual real device
white edges everywhere. even on bitmap fonts

TTStu

Anyone tested on iOS 7.04 yet? Any more changes/surprises?

Dro

just tested.
works the same as 7.0.3

TTStu

Ah cool, I wondered if it would magically revert again, some sneaky way of breaking 2d engines and pushing developer towards sprite kit 😉