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  #1  
Old 07-Jun-2007, 02:05
ykhuang ykhuang is offline
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Problem with PNG background

Hi there,

I'm developing applications based on v.1.1.3. The app draws some image buttons on a wallpaper. All graphic elements are provided in PNG format. But some images go disappeared when some button was pushed.

Here goes the example. Use bg1(PNG) as background. Button b1,b2,b3 are lined from left to right. If b3 was pushed, b2 will disappear. It seems to be covered by redraw of background. So I create another background bg2 in JPG format to replace the PNG one, the buttons act normal now. Is it some bug in button or PNG classes?

CPP / C++ / C Code:
#include <FL/Fl.H>
#include <FL/Fl_Window.H>
#include <FL/Fl_JPEG_Image.H>
#include <FL/Fl_PNG_Image.H>
#include <FL/Fl_Button.H>
#include <FL/Fl_Group.H>
#include <FL/Fl_Box.H>

int main() {
        Fl_Window     win(320,240);
        win.begin();
        Fl_PNG_Image  p1("/var/1.png");
        Fl_PNG_Image  p2("/var/2.png");
        Fl_PNG_Image  p3("/var/3.png");
        Fl_PNG_Image  bg1("/var/screenbg.png");
        Fl_JPEG_Image bg2("/var/screenbg.jpg");
        Fl_Box            box1(FL_NO_BOX,0,0,320,240,0);
        box1.image(bg2);
        Fl_Button       b1(1,1,35,35,0);
        b1.image(p1);
        b1.box(FL_OVAL_FRAME);
        Fl_Button       b2(42,1,35,35,0);
        b2.image(p2);
        b2.box(FL_OVAL_FRAME);
        Fl_Button       b3(82,1,35,35,0);
        b3.image(p3);
        b3.box(FL_OVAL_FRAME);
        win.end();
        win.show();
        return(Fl::run());
}
  #2  
Old 07-Jun-2007, 05:37
cable_guy_67's Avatar
cable_guy_67 cable_guy_67 is offline
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Re: Problem with PNG background

Quote:
Originally Posted by ykhuang
Hi there,
Hello and Welcome to GIDForums™!

Quote:
Originally Posted by ykhuang
I'm developing applications based on v.1.1.3.
Is there some reason you are using such an old version? If it is possible, I would suggest getting updated a bit. The latest snapshots are quite stable and could be called 1.1.8 if you like. It can be found at fltk.org on the download page.

Look at that, code tags on your first post. Rockin' !

If you want, you can zip up the images and attach them to your post. I will give your code a run on 1.1.8 then.

BTW, what platform are you using? I can give it a run on WIN. No 'nix box with me here though...

Mark
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  #3  
Old 07-Jun-2007, 09:07
ykhuang ykhuang is offline
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Re: Problem with PNG background

Thanks for the reply,

My target platform is a ARM9 SoC. The graphics engine below FLTK is NXLib+microwindows. It is said that NXLib has been test a lot with FLTK 1.1.3, that's why I start from this version.

I also build a emulation platform on Linux and get the same result. I'll try a updated FLTK with NXLib+microwindows to see if it could correct the problem.

The test PNG/JPG files are attached. You may give it a try, and thank you.
Attached Files
File Type: zip fltktest.zip (47.0 KB, 14 views)
  #4  
Old 07-Jun-2007, 19:01
cable_guy_67's Avatar
cable_guy_67 cable_guy_67 is offline
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Re: Problem with PNG background

XP using CygWin and FLTK 1.1.current-svn (essentially 1.1.8)

Minor code changes.
CPP / C++ / C Code:
#include <FL/Fl.H>
#include <FL/Fl_Window.H>
#include <FL/Fl_JPEG_Image.H>
#include <FL/Fl_PNG_Image.H>
#include <FL/Fl_Button.H>
#include <FL/Fl_Group.H>
#include <FL/Fl_Box.H>

int main() {
        Fl_Window     win(320,240);
        win.begin();
        Fl_PNG_Image  p1("1.png");
        Fl_PNG_Image  p2("2.png");
        Fl_PNG_Image  p3("3.png");
        Fl_PNG_Image  bg1("screenbg.png");
//         Fl_JPEG_Image bg2("screenbg.jpg");
        Fl_Box            box1(FL_NO_BOX,0,0,320,240,0);
        box1.image(bg1);
        Fl_Button       b1(1,1,35,35,0);
        b1.image(p1);
        b1.box(FL_OVAL_FRAME);
        Fl_Button       b2(42,1,35,35,0);
        b2.image(p2);
        b2.box(FL_OVAL_FRAME);
        Fl_Button       b3(82,1,35,35,0);
        b3.image(p3);
        b3.box(FL_OVAL_FRAME);
        win.end();
        win.show();
        return(Fl::run());
}

I can click away and everything stays visible. See attached image.

Hopefully the version change will help. If its platform, I can't help there.

Mark
Attached Images
File Type: png screenshot.png (37.1 KB, 51 views)
__________________
"Opportunity is missed by most people because it comes dressed in overalls and looks like work."
--Thomas Alva Edison
"Those who would give up essential liberty to purchase a little temporary safety, deserve neither liberty nor safety."
--Benjamin Franklin
"A happy person is not a person in a certain set of circumstances, but rather a person with a certain set of attitudes."
--Hugh Downs
  #5  
Old 07-Jun-2007, 21:18
ykhuang ykhuang is offline
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Re: Problem with PNG background

Thank you guy,

I'll keep trying with latest version.
  #6  
Old 10-Jun-2007, 03:16
ykhuang ykhuang is offline
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Re: Problem with PNG background

The problem is solved when I use latest FLTK 1.1.x. I think the 1.1.3 is not so compatible with libpng. So I use the local png library in 1.1.x instead.

I will put it to my ARM target platform to do more test. Hope it fine with it.
 
 
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