QML->Image showing black rectangle instead of image

[ben80]

Hi everyone,

i already asked this question in the QtPi forum, but i think it's too specific.

My Problem:
I use QML->Image to display an image on the raspberry pi.
Whenever the image dimensions are too big (roughly >~2000pixel in one direction), i see a black rectangle instead of the image.
When i limit the memory usage by "sourceSize" <~2000 it does work. But i need to work with the original image, not the downscaled one.

My Code:
@ Image{
id:box1
width: 800; height: 800
sourceSize.width: 1920 -> works as long as the value is <~2000
sourceSize.height: 1600
x: 50; y: 50
source: "pic1.jpg"
opacity: 1
fillMode: Image.PreserveAspectFit
cache: false
smooth: true
}@

I assigned 256MB memory to the gpu which is much more than the image i want to display (~3000x2000 pixel @24Bit -> ~17MB)

Questions:

Do you think it's a memory issue?

Why are 256MB GPU Memory not enough?

Any ideas how to debug this problem further?

*My system: *
desktop: qt 5.2.1
raspberry: qt 5.3.0 (but i am not sure if it’s the final or some kind of beta. Is there a way to figure that out?)

Thanks for all comments,
Ben

[dheerendra]

Few inputs from my side. What is the size of the image ? If you don't specify any width and height does it work ? Can you try adding the scrollview for the image ?

[ben80]

bq. What is the size of the image?

I have different, neither work:
3264 x 2448
3456 x 2592

bq. If you don’t specify any width and height does it work ?

You mean, without sourceSize.width and sourceSize.height?
That doesn't work either

bq. Can you try adding the scrollview for the image ?

I didn't try that. What benefit would i have?

Ben