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color.c: X11Compliance vs. XPMCompliance

https://imagemagick.com/discourse-server/viewtopic.php?t=23462

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color.c: X11Compliance vs. XPMCompliance

Posted: 2013-05-22T05:42:24-07:00
by Petr
Is following correct? Following colors are marked as X11Compliance, but not as XPMCompliance:
-foo{1,2,3,4}
-greyN
-*Grey
-DarkBlue
-DarkCyan
-DarkGray
-DarkMagenta
-DarkRed
-LightGreen
-white

Actually, I don't know the difference between X11 and XPM colors (didn't see the list of xpm colors, where is it?). I believe *{G,g}rey* was removed to avoid duplicity, I understood foo{1,2,3,4} was removed but the rest seems fishy to me. This is with 6.8.5-7. Sorry if I am missing something.

Thanks!

Re: color.c: X11Compliance vs. XPMCompliance

Posted: 2013-05-22T08:52:13-07:00
by Petr
The consequence is, that e. g. dddback.xpm from ddd package fails to convert to other format. Even if QueryColorCompliance() throws only warning, later check in xpm.c throws error on

Code: Select all

  if (j < (ssize_t) image->colors)
    ThrowReaderException(CorruptImageError,"CorruptImage");
dddback.xpm defines colors as follows:

Code: Select all

". c White",
"X c Grey90",

Re: color.c: X11Compliance vs. XPMCompliance

Posted: 2013-05-22T08:58:23-07:00
by Petr
Dunno if it is saying anything, but

Code: Select all

#include<stdlib.h>
#include<X11/Xlib.h>
#include<X11/xpm.h>
#include <stdio.h>

int main(int argc, char *argv[])
{
  Display *dpy;
  XImage *img;


  /* open the display (connect to the X server) */
  dpy = XOpenDisplay(getenv("DISPLAY"));


  /* read the image */
  if (XpmReadFileToImage(dpy, argv[1], &img, NULL, NULL)) {
      printf("Error reading file\n");
      exit(1);
  }

  printf("Ok\n");

  XCloseDisplay(dpy);
  return 0;
}
opens this image without any error.

Re: color.c: X11Compliance vs. XPMCompliance

Posted: 2013-06-02T19:02:49-07:00
by anthony
XPM images need to use X11 colors. But IM generally uses SVG colors.

The difference is in only a few specific colors.
See IM Examples, Color Name Conflicts
http://www.imagemagick.org/Usage/color_ ... _conflicts

My last round of testing ensured that XPM colors are read and are written using X11 colors,
though you would need to be careful in color specifications on the command line (which uses SVG color names) when using this image format.

Re: color.c: X11Compliance vs. XPMCompliance

Posted: 2013-06-03T07:09:18-07:00
by Petr
Following patch:

Code: Select all

Index: ImageMagick-6.8.5-7/coders/xpm.c
===================================================================
--- ImageMagick-6.8.5-7.orig/coders/xpm.c
+++ ImageMagick-6.8.5-7/coders/xpm.c
@@ -382,7 +382,7 @@ static Image *ReadXPMImage(const ImageIn
         image->storage_class=DirectClass;
         image->matte=MagickTrue;
       }
-    status=QueryColorCompliance(target,XPMCompliance,&image->colormap[j],
+    status=QueryColorCompliance(target,X11Compliance,&image->colormap[j],
       exception);
     if (status == MagickFalse)
       break;
I need to read for example dddback.xpm from ddd-3.3.12 xpm. And the offended change is here:
http://trac.imagemagick.org/changeset/1 ... ders/xpm.c
The reason is, that White and Grey90 is not XPMCompliance defined in ImageMagick, as far as I can see.

Code: Select all

/* XPM */
static char * dddback_xpm[] = {
/* $Id: dddback.xpm 6405 2003-05-24 15:27:46Z apg $
 * DDD Backdrop.  Copyright (C) 1998 TU Braunschweig, Germany.
 * For details on DDD, see `http://www.gnu.org/software/ddd/'.
 * columns rows colors chars-per-pixel */
"150 150 2 1",
". c White",
"X c Grey90",
/* pixels */
"...........X.......................................................................................................................XX...X..XX.........",
"...........XX......................................................................................................................XX....X.XX.........",
"XXXXXXXXX.X.XX.....................................................................................................................X.....XXXXX.XXX..XX",
"XXXXXXXXX.X.XX.....................................................................................................................X.....X..XX.XXXX...",
".XXXXXXX..X..X.....................................................................................................................X.....XX.XX..XXXXX.",
".........XXX.X.....................................................................................................................X......XXXXX.......",
"........XXXXX......................................................................................................................XX......X.XXX......",
"XXXXX..XXXXXX......................................................................................................................XX......XX.XXX...XX",
"XX....XXXXXXXX.....................................................................................................................XX.......XXXXXXX...",
"...XXXXXXXXXXX......................................................................................................................X........X..XXXXX.",
"XXXXXXXXXXXXXXX....................................................................................................................X..........XXXXXXXX",
"XXXX..XXXXXXXXXX...................................................................................................................X............X..XXX",
"........XXXXXXXXX.................................................................................................................X..............X...X",
"..........XXXXXXXX..............................................................................................................XX................XXX.",
"............XXXXXXX.............................................................................................................X.....................",
".............XXXXXXX..................................................................................................................................",
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"...........................................................XX......X.XXX...............XXXXX..........................................................",
"...........................................................XX......XX.XXX...XXXXXXXX..XXXXXX..........................................................",
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"............................................................X........X..XXXXX.....XXXXXXXXXXX.........................................................",
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"X...........XX.........................................................................................................................X..........XX.X",
"X..XX.....XXX..........................................................................................................................XX.....XX..X...",
"XXX.X.....X.............................................................................................................................X.....X.XXX...",
"X...X...XX..............................................................................................................................XX...XX...X...",
"....X...X.................................................................................................................................XXXXX....XXX",
"...XX.XX...................................................................................................................................XX.XX......",
"..XXXXX.......................................................................................................................................XXX.....",
"XXX.............................................................................................................................................XXXXXX",
"..X.............................................................................................................................................X.....",
"XXXXX.........................................................................................................................................XXXXX...",
"XXXX.X..XXX..................................................................................................................................X.....XXX",
"....XXXXXXXX..........................................................................................................................XX....XX...XXXX.",
".......X...XX........................................................................................................................XXXXXXXXX..XX....",
"XXXXXX..X...XX......................................................................................................................XX....XX.XXXX..XXX",
"XXXXXXX..X..XX......................................................................................................................X....XX...XX..XXXX",
"..........X..X.....................................................................................................................XX....X....X.......",
"...........X..XX...................................................................................................................XX...XXXXXXX.......",
"...........X...XX.................................................................................................................XX....X...XX........",
"XXXXXXXXXX.X.....XX..............................................................................................................XX....XX...XX.XXXXXXX",
"XXXXXXXXXX.XX......XX............................................................................................................X...XX.X..XX..X.XXXXX",
"XXXXXXXXXX..X...................................................................................................................X...XXX.XXXXX..X..XXXX",
"............X.................................................................................................................XX....X...X..XX........."
};

Re: color.c: X11Compliance vs. XPMCompliance

Posted: 2013-06-03T07:34:19-07:00
by magick
Use Gray90. We'll add white as a compliant color by sometime tomorrow. Thanks.
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