# To subscribers of the xforms list from David Scriven <davidwriter@yahoo.com> :
I'm writing an image display routine. The image has multiple
planes and I have written a routine using FL_IMAGE as a
base. The image is displayed on a free form. I first set the
image thus:
// Setup image
bitmap = flimage_alloc();
bitmap->type = FL_IMAGE_CI;
bitmap->w = Xdim;
bitmap->h = Ydim;
bitmap->map_len=260;
bitmap->ci_maxval=260;
flimage_getmem(bitmap);
// Create a mono bitmap
for(int i = 0; i < 256; i++)
{
bitmap->red_lut[i] = i;
bitmap->green_lut[i] = i;
bitmap->blue_lut[i] = i;
}
// other special colormap settings
.....
The core of the display loop is the simple sequence:
void Play::ConvertImageToDisplay()
{
....
Calculate bitmap values from lookup
...
bitmap->modified = 1;
flimage_sdisplay(bitmap, window);
}
This works perfectly and displays any plane on
command - however if I add the code
char planetxt[16];
sprintf(planetxt,"%d",planeno);
flimage_add_text(bitmap,planetxt,strlen(planetxt),FL_FIXED_STYLE,
FL_NORMAL_SIZE, FL_PACK(255,0,0), 0, 1, 10.0, 10.0, 0);
before the bitmap->modified = 1 line
and add
flimage_delete_all_text(bitmap);
after the flimage_sdisplay it crashes the SECOND time I enter
this section of code ie - it displays the number on the image the
first time, but when I try and show a different number (and plane),
it crashes.
When a do a debug I get the following error sequence:
(gdb) where
#0 0x4005d2db in XTextWidth () from /usr/X11R6/lib/libX11.so.6
#1 0x40188d3b in fl_drw_string () from /usr/lib/libforms.so.0.89
#2 0x40189753 in fl_draw_text_cursor () from /usr/lib/libforms.so.0.89
#3 0x40189b89 in fl_draw_text_inside () from /usr/lib/libforms.so.0.89
#4 0x40159593 in display_text () from /usr/lib/libforms.so.0.89
#5 0x4014b1ee in handle_redraw () from /usr/lib/libforms.so.0.89
#6 0x4014ba4a in flimage_sdisplay () from /usr/lib/libforms.so.0.89
#7 0x0804b5e0 in Play::ConvertImageToDisplay (this=0xbffff450)
I'm running ver 0.89-6 under Red Hat Linux 7.2 with XFree v 4.0.3 and using
the gcc v 2.96-85 compiler
I've tried flimage_add_text_struct with the same effect.
I thought that flimage_render_annotation might solve the
problem but it caused the program to crash immediately
with an error in XPutImage().
I'd be grateful for advice.
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