QImage to Qpixmap conversion is too slow

[lansing]

@mrjj

At the line update(). It points to function QImage::operator=

[Christian Ehrlicher]

Do you update your image from a different thread? If so you should learn about threading: Threading Basics

[lansing]

@Christian-Ehrlicher

HI, is this related to the crash?

[mrjj]

@lansing

Hi
yes if you do it from another thread then very much yes.

[lansing]

@mrjj

I don't have threading in the program.

[mrjj]

@lansing
Hi
then something is wrong with the image then.
Else why crash on copy.

can you try with Image that you are 100% sure is valid ?

[lansing]

@mrjj

Hi, I have set the image to one in my resource folder for testing, now it has crashed at line m_frameImage = image. I have changed the image argument from const QImage & to QImage*, I don't know if that have a effect on it. But in debug, it did show my image dimension.

QImage *img= new QImage(":/cross.png");
myGLPainter->drawImage(img);

[mrjj]

@lansing
and it does still crash ?

[lansing]

Yes, it said

error: Debugger encountered an exception: Exception at 0x7ff71b7e9b88, code: 0xc0000005: read access violation at: 0xffffffffffffffff, flags=0x0

[Christian Ehrlicher]

@lansing said in QImage to Qpixmap conversion is too slow:

myGLPainter

Where do you initialize this variable?

[SGaist]

@lansing said in QImage to Qpixmap conversion is too slow:

QImage *img= new QImage(":/cross.png");
myGLPainter->drawImage(img);

That's the wrong thing to do as you will leak images doing so.

Beside the initialization issue pointed by @Christian-Ehrlicher can you provide the stack trace of your crash ?