[Qt-interest] QT program having issues over VNC

[Cole, Derek]

So I left he code as-is, and started VNC server with 24 bit color depth, and that takes care of the problem. I guess because I was using a QImage that was coming out of my view, QT must upgrade or downgrade the color depth to the display, instead of leaving it at whatever the original file was at. Kind of annoying. Setting the color depth solves the problem. It would be nice to have a way to run this without worry about that though.
________________________________
From: qt-interest-bounces+dcole=integrity-apps.com at qt.nokia.com [qt-interest-bounces+dcole=integrity-apps.com at qt.nokia.com] on behalf of Cole, Derek [dcole at integrity-apps.com]
Sent: Tuesday, May 24, 2011 10:53 AM
To: Diego Iastrubni
Cc: qt-interest at trolltech.com
Subject: Re: [Qt-interest] QT program having issues over VNC

Well, where I call that bits() method, I am just trying to get the raw data from the image chip. I store it in this loop like so:

     int chipDataLength = chip.bytesPerLine();
     int bpp = chipDataLength/imwidth;

 unsigned char * tempData = (unsigned char *)malloc(imheight*chipDataLength*sizeof(unsigned char));
unsigned char * oneBandData = (unsigned char *)malloc(imheight*imwidth*sizeof(unsigned char));
tempData = chip.bits();
    for (int i = 0; i < imheight; i++){
        for (int j = 0; j < imwidth; j++){
            oneBandData[i*imwidth+j] = tempData[i*chipDataLength + j*4];
        }
    }

so chipDataLength gives me the length in bytes of a single row of the image. bpp is the number of bytes per pixel.  in the line in the loop, i am multiplying i by the data width, and j by 4 because I only really care about picking up one channel out of the grayscale image (since all the channels were set to the same gray value). How to I made adjustments to this to pad that 4-bit value to an 8bit unsigned char? It seems like it should be happening implicitly since my  arrays are unsigned char, right?



________________________________
From: Diego Iastrubni [diegoiast at gmail.com]
Sent: Tuesday, May 24, 2011 1:08 AM
To: Cole, Derek
Cc: Arnold Krille; qt-interest at trolltech.com
Subject: Re: [Qt-interest] QT program having issues over VNC


On Mon, May 23, 2011 at 9:24 PM, Cole, Derek <dcole at integrity-apps.com<mailto:dcole at integrity-apps.com>> wrote:
I think this is narrowing in on that same thing - I am passing single-band data to my image filters, so they just work in grayscale essentially. I noticed that when I create my image chip from the QImage, and then do a bytesPerLine() call, I basically get 4x width on SSH, and only 2x width when I am running it from VNC. I had no idea this call would be dependent on something like that. My image

what does "bits()" return? It seems that over ssh you get a 32bit image (RGBA) and under vnc you get only 16 (4 bits per channel). If so - should e trivial to fix. How do you construct your QImage?

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