using imlib2 to display images doesn't seem to work correctly

I've found an odd issue where some images don't display using imlib_render_image_on_drawable() on fluxbox, but work fine elsewhere.  I found this using Fedora 14 and basically just using a modified version of the imlib test code in the documentation from Carsten Haitzler [1].  What happens is just an empty (black) window is displayed, imlib_image_get_height(), etc, return the correct results, but the image isn't displayed.  I don't know if this is a fluxbox problem or imlib, really, but I thought I'd start here.

Many larger images (like from my camera) work fine, but the problem can be recreated with these:
http://fluxbox.org/screenshots/screenshots_full/screenshot_bobbens.png
http://fluxbox.org/screenshots/screenshots_full/screenshot_zan.png

I don't think it correlates just to the image size, but I don't know why some work - just that it seems that images larger than the standard 2meg cache work fine (even if the cache is disabled).

I tried updating imlib to 1.4.4, I didn't see any changes to fluxbox that lead me to a rebuild past 1.1.1 that's in Fedora.  Let me know, I can try that.

Using imlib_render_image_on_drawable_at_size() using the size of the image does always display the image correctly, it's in the test case after the failing call.  I tried turning off the cache, both in the small test application and in fluxbox (src/FbTk/ImageImlib2.cc), but that doesn't make any difference.  I'm typically doing this under VNC, it works fine on mwm and the Fedora-standard gnome/metacity desktop - I only see this problem using the testcase on fluxbox.

I've included a test case where you provide an image file and a display time, it first tries with imlib_render_image_on_drawable(), and then with imlib_render_image_on_drawable_at_size().  With fluxbox and the images above it always just gives a black window with imlib_render_image_on_drawable(), and then the image when it imlib_render_image_on_drawable_at_size().

Anyone have any ideas?  It's confusing to me, I'm not sure if I'm missing something I should be doing or where a bug might be.  Both functions just call __imlib_RenderImage with slightly different parameters, I checked that __imlib_RenderImage is not simply exiting because of a 0 dw/dh.

It may be unrelated, but I initially had difficulties getting fbdesk to work correctly.  Certainly all the icon image files I tried to use with fbdesk fail to display with this test case, but again, it could be completely unrelated.

Thanks much,

Mike

1.  http://docs.enlightenment.org/api/imlib2/html/

Compile with gcc -o testcase testcase.c `imlib2-config --cflags` `imlib2-config --libs` as per the docs above.


/* This is based on the code provided in the documentation.
 * See either doc/index.html or online at:
 * http://docs.enlightenment.org/api/imlib2/html/
 *
 * This package is under a BSD-like license, included below:
 *
 * Copyright (C) 2000 Carsten Haitzler and various contributors (see AUTHORS)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies of the Software and its Copyright notices. In addition publicly
 * documented acknowledgment must be given that this software has been used if no
 * source code of this software is made available publicly. This includes
 * acknowledgments in either Copyright notices, Manuals, Publicity and Marketing
 * documents or any documentation provided with any product containing this
 * software. This License does not apply to any software that links to the
 * libraries provided by this software (statically or dynamically), but only to
 * the software provided.
 * /

/* include X11 stuff */
#include <X11/Xlib.h>
/* include Imlib2 stuff */
#include <Imlib2.h>
/* sprintf include */
#include <stdio.h>

/* some globals for our window & X display */
Display *disp;
Window   win;
Visual  *vis;
Colormap cm;
int      depth;

/* the program... */
int main(int argc, char **argv)
{
   /* image variable */
   Imlib_Image image;
   /* the height and width of the window */
   int h, w;
   /* arguments */
   char imagename[256];
   int sleeptime;

   if (argc !=3) {
      printf("This test takes 3 arguments, an image file and a time to "
             "display the image.\n");
      return 1;
   }
   snprintf(imagename, 256, "%s", argv[1]);
   sleeptime = atoi(argv[2]);

   /* connect to X */
   disp  = XOpenDisplay(NULL);
   /* get default visual , colormap etc. you could ask imlib2 for what it */
   /* thinks is the best, but this example is intended to be simple */
   vis   = DefaultVisual(disp, DefaultScreen(disp));
   depth = DefaultDepth(disp, DefaultScreen(disp));
   cm    = DefaultColormap(disp, DefaultScreen(disp));
   win = XCreateSimpleWindow(disp, DefaultRootWindow(disp), 
                             0, 0, 640,
                             480, 0, 0, 0);
   XMapWindow(disp, win);

   /* set our cache to 0 so it's unused */
   imlib_set_cache_size(0);
   /* set the maximum number of colors to allocate for 8bpp and less to 128 */
   imlib_set_color_usage(128);
   /* dither for depths < 24bpp */
   imlib_context_set_dither(1);
   /* set the display , visual, colormap and drawable we are using */
   imlib_context_set_display(disp);
   imlib_context_set_visual(vis);
   imlib_context_set_colormap(cm);
   imlib_context_set_drawable(win);


   /* load the image */
   image = imlib_load_image(imagename);
     if (!image) {
        printf("image didn't load\n");
        return -1;
     }
   imlib_context_set_image(image);

   imlib_render_image_on_drawable(0, 0);
   sleep(sleeptime);
   imlib_render_image_on_drawable_at_size(0, 0, imlib_image_get_width(),
                                          imlib_image_get_height());
   sleep(sleeptime);
   imlib_free_image_and_decache();

   return 0;
}

-- 
Mike Ranweiler


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