Re: Emacs 26.1 release branch created

[Mark Oteiza <mvoteiza@udel.edu>]

On 16/09/17 at 02:58pm, Eli Zaretskii wrote:
> > Date: Sat, 16 Sep 2017 10:51:12 -0400
> > From: Mark Oteiza <mvoteiza@udel.edu>
> > Cc: emacs-devel@gnu.org
> > 
> > making the Lisp functions:
> > 
> > lcms-xyz->jch
> > lcms-jch->jab
> > lcms-jab->jch
> > lcms-jch->xyz
> > 
> > and adding a Lisp variable `lcms-d65-xyz' as the default whitepoint for
> > all the functions in lcms.c that need one.  That should be two commits
> > if I can get all the Windows build stuff correct.
> 
> That can certainly go to emacs-26.
> 
> > I plan to add more, but I can wait for an emacs-26 -> master merge and
> > continue to work on master.
> 
> If you consider the feature fairly complete for a first release, then
> that's fine.  Otherwise we could consider adding more of your code to
> emacs-26, unless you think the development will take a considerable
> time.  In general, once the first pretest is out (which will be
> probably a week or 2 from now), no new features should be added.

I ended up going back on what I said in d24ec5854 after thinking about what
I wanted to add, how the API should look, and going through some iterations
adding those functions.  I think I'll leave it at those three functions for
emacs-26.

In the interest of reducing the amount of (duplicated) code, especially as more
Lisp functions are added, I propose the following.  I followed from your code
and from how it's done in xml.c, not sure if you have a particular reason for
doing it one way or the other.

 src/lcms.c | 75 ++++++++++++++++++++++----------------------------------------
 1 file changed, 26 insertions(+), 49 deletions(-)

diff --git a/src/lcms.c b/src/lcms.c
index a5e527911e..950ffb5f51 100644
--- a/src/lcms.c
+++ b/src/lcms.c
@@ -76,6 +76,26 @@ init_lcms_functions (void)
 
 #endif	/* WINDOWSNT */
 
+static bool
+lcms2_available_p (void)
+{
+#ifdef WINDOWSNT
+  Lisp_Object found = Fassq (Qlcms2, Vlibrary_cache);
+  if (CONSP (found))
+    return NILP (XCDR (found)) ? false : true;
+  else
+    {
+      Lisp_Object status;
+      lcms_initialized = init_lcms_functions ();
+      status = lcms_initialized;
+      Vlibrary_cache = Fcons (Fcons (Qlcms2, status), Vlibrary_cache);
+      return status;
+    }
+#else  /* !WINDOWSNT */
+  return true;
+#endif
+}
+
 static bool
 parse_lab_list (Lisp_Object lab_list, cmsCIELab *color)
 {
@@ -109,15 +129,8 @@ chroma, and hue, respectively. The parameters each default to 1.  */)
   cmsCIELab Lab1, Lab2;
   cmsFloat64Number Kl, Kc, Kh;
 
-#ifdef WINDOWSNT
-  if (!lcms_initialized)
-    lcms_initialized = init_lcms_functions ();
-  if (!lcms_initialized)
-    {
-      message1 ("lcms2 library not found");
-      return Qnil;
-    }
-#endif
+  if (!(init_lcms_functions ()))
+    return Qnil;
 
   if (!(CONSP (color1) && parse_lab_list (color1, &Lab1)))
     signal_error ("Invalid color", color1);
@@ -244,15 +257,8 @@ The default viewing conditions are (20 100 1 1).  */)
   double Jp1, ap1, bp1, Jp2, ap2, bp2;
   double Mp1, Mp2, FL, k, k4;
 
-#ifdef WINDOWSNT
-  if (!lcms_initialized)
-    lcms_initialized = init_lcms_functions ();
-  if (!lcms_initialized)
-    {
-      message1 ("lcms2 library not found");
-      return Qnil;
-    }
-#endif
+  if (!(init_lcms_functions ()))
+    return Qnil;
 
   if (!(CONSP (color1) && parse_xyz_list (color1, &xyz1)))
     signal_error ("Invalid color", color1);
@@ -313,15 +319,8 @@ Valid range of TEMPERATURE is from 4000K to 25000K.  */)
   cmsCIExyY whitepoint;
   cmsCIEXYZ wp;
 
-#ifdef WINDOWSNT
-  if (!lcms_initialized)
-    lcms_initialized = init_lcms_functions ();
-  if (!lcms_initialized)
-    {
-      message1 ("lcms2 library not found");
-      return Qnil;
-    }
-#endif
+  if (!(init_lcms_functions ()))
+    return Qnil;
 
   CHECK_NUMBER_OR_FLOAT (temperature);
 
@@ -332,27 +331,6 @@ Valid range of TEMPERATURE is from 4000K to 25000K.  */)
   return list3 (make_float (wp.X), make_float (wp.Y), make_float (wp.Z));
 }
 
-DEFUN ("lcms2-available-p", Flcms2_available_p, Slcms2_available_p, 0, 0, 0,
-       doc: /* Return t if lcms2 color calculations are available in this instance of Emacs.  */)
-     (void)
-{
-#ifdef WINDOWSNT
-  Lisp_Object found = Fassq (Qlcms2, Vlibrary_cache);
-  if (CONSP (found))
-    return XCDR (found);
-  else
-    {
-      Lisp_Object status;
-      lcms_initialized = init_lcms_functions ();
-      status = lcms_initialized ? Qt : Qnil;
-      Vlibrary_cache = Fcons (Fcons (Qlcms2, status), Vlibrary_cache);
-      return status;
-    }
-#else  /* !WINDOWSNT */
-  return Qt;
-#endif
-}
-
 \f
 /* Initialization */
 void
@@ -360,7 +338,6 @@ syms_of_lcms2 (void)
 {
   defsubr (&Slcms_cie_de2000);
   defsubr (&Slcms_cam02_ucs);
-  defsubr (&Slcms2_available_p);
   defsubr (&Slcms_temp_to_white_point);
 
   Fprovide (intern_c_string ("lcms2"), Qnil);