NS: Add native image support for HEIF, SVG and WEBP on GNUstep

* src/nsimage.m (ns_can_use_native_image_api): Handle HEIF, SVG
and WEBP image types on GNUstep.
* src/image.c (syms_of_image): Add conditional native image
support for HEIF, SVG and WEBP on GNUstep.  (Bug#80101)

2 files changed, 31 insertions, 5 deletions

diff --git a/src/image.c b/src/image.c
index ac6e76f10a7..71a091ea498 100644
--- a/src/image.c
+++ b/src/image.c
@@ -13054,11 +13054,18 @@ non-numeric, there is no explicit limit on the size of images.  */);
 
 #if defined (HAVE_WEBP)                                         \
   || (defined (HAVE_NATIVE_IMAGE_API)                           \
-      && ((defined (HAVE_NS) && defined (NS_IMPL_COCOA))        \
-          || defined (HAVE_HAIKU)))
+      && (defined (HAVE_NS) || defined (HAVE_HAIKU)))
   DEFSYM (Qwebp, "webp");
   DEFSYM (Qwebpdemux, "webpdemux");
+#if !defined (NS_IMPL_GNUSTEP) || defined (HAVE_WEBP)
   add_image_type (Qwebp);
+#else
+
+  /* On GNUstep, WEBP support is provided via ImageMagick only if
+     gnustep-gui is built with --enable-imagemagick.  */
+  if (image_can_use_native_api (Qwebp))
+    add_image_type (Qwebp);
+#endif /* NS_IMPL_GNUSTEP && !HAVE_WEBP */
 #endif
 
 #if defined (HAVE_IMAGEMAGICK)
@@ -13081,18 +13088,27 @@ non-numeric, there is no explicit limit on the size of images.  */);
   DEFSYM (Qgobject, "gobject");
 #endif /* HAVE_NTGUI  */
 #elif defined HAVE_NATIVE_IMAGE_API                     \
-  && ((defined HAVE_NS && defined NS_IMPL_COCOA)        \
-      || defined HAVE_HAIKU)
+  && (defined HAVE_NS || defined HAVE_HAIKU)
   DEFSYM (Qsvg, "svg");
 
-  /* On Haiku, the SVG translator may not be installed.  */
+  /* On Haiku, the SVG translator may not be installed.  On GNUstep, SVG
+     support is provided by ImageMagick so not guaranteed.  Furthermore,
+     some distros (e.g., Debian) ship ImageMagick's SVG module in a
+     separate binary package which may not be installed.  */
   if (image_can_use_native_api (Qsvg))
     add_image_type (Qsvg);
 #endif
 
 #ifdef HAVE_NS
   DEFSYM (Qheic, "heic");
+#ifdef NS_IMPL_COCOA
   add_image_type (Qheic);
+#else
+
+  /* HEIC support in gnustep-gui is provided by ImageMagick.  */
+  if (image_can_use_native_api (Qheic))
+    add_image_type (Qheic);
+#endif /* NS_IMPL_GNUSTEP */
 #endif
 
 #if HAVE_NATIVE_IMAGE_API
diff --git a/src/nsimage.m b/src/nsimage.m
index 3c318c37cfd..426ce20eb05 100644
--- a/src/nsimage.m
+++ b/src/nsimage.m
@@ -102,6 +102,16 @@ ns_can_use_native_image_api (Lisp_Object type)
     imageType = @"gif";
   else if (EQ (type, Qtiff))
     imageType = @"tiff";
+#ifndef HAVE_RSVG
+  else if (EQ (type, Qsvg))
+    imageType = @"svg";
+#endif
+#ifndef HAVE_WEBP
+  else if (EQ (type, Qwebp))
+    imageType = @"webp";
+#endif
+  else if (EQ (type, Qheic))
+    imageType = @"heic";
 
   types = [NSImage imageFileTypes];
 #endif