[gimp] meson: separate line for HEIC and AVIF support.

[Jehan <jehanp src gnome org>]

commit cb2268ab21e1aed70361b37bbbc3308ea7b5db70
Author: Jehan <jehan girinstud io>
Date:   Mon Oct 19 18:52:18 2020 +0200

    meson: separate line for HEIC and AVIF support.
    
    libheif pc files provides variables which are actually older than our
    minimum libheif requirement (so it's usable generically) to determinate
    if libheif was built for HEIC/AVIF support. This is quite useful as we
    had our share of annoyance with missing support of some encoder/decoder
    even when libheif requirement was alright.
    
    Also adding image/avif (if relevant decoder is present) to list of
    supported mimetypes.

 meson.build                 | 57 ++++++++++++++++++++++++++++++++-------------
 plug-ins/common/meson.build |  2 +-
 2 files changed, 42 insertions(+), 17 deletions(-)
---
diff --git a/meson.build b/meson.build
index 08caeb0e8f..21cffaf761 100644
--- a/meson.build
+++ b/meson.build
@@ -728,22 +728,45 @@ libheif = dependency('libheif', version: '>='+libheif_minver,
 conf.set('HAVE_LIBHEIF_1_4_0', libheif.version().version_compare('>=1.4.0'))
 conf.set('HAVE_LIBHEIF_1_6_0', libheif.version().version_compare('>=1.6.0'))
 
-if libheif.found()
-  MIMEtypes += [
-    'image/heif',
-    'image/heic',
-  ]
-endif
+can_import_heic = 'no'
+can_export_heic = 'no'
+can_import_avif = 'no'
+can_export_avif = 'no'
 
+have_heif = libheif.found()
 libheif_warning=''
-if libheif.version().version_compare('==1.5.0') or libheif.version().version_compare('==1.5.1')
-  libheif_warning='''
+if have_heif
+  have_heif = true
+  can_import_heic = libheif.get_pkgconfig_variable('builtin_h265_decoder')
+  can_export_heic = libheif.get_pkgconfig_variable('builtin_h265_encoder')
+  if can_import_heic == 'yes'
+    MIMEtypes += [
+      'image/heif',
+      'image/heic',
+    ]
+  endif
 
-        libheif version 1.5.0 and 1.5.1 are known to crash when
-        exporting (bug #4185). Please update.
-    '''
-    warning(libheif_warning)
-    warnings += libheif_warning
+  can_import_avif = libheif.get_pkgconfig_variable('builtin_avif_decoder')
+  can_export_avif = libheif.get_pkgconfig_variable('builtin_avif_encoder')
+  if can_import_avif == 'yes'
+    MIMEtypes += [
+      'image/avif'
+    ]
+  endif
+
+  if can_import_heic != 'yes' and can_import_avif != 'yes'
+    have_heif = false
+  endif
+
+  if have_heif and (libheif.version().version_compare('==1.5.0') or 
libheif.version().version_compare('==1.5.1'))
+    libheif_warning='''
+
+          libheif version 1.5.0 and 1.5.1 are known to crash when
+          exporting (bug #4185). Please update.
+      '''
+      warning(libheif_warning)
+      warnings += libheif_warning
+  endif
 endif
 
 have_vala = add_languages('vala', required: get_option('vala-plugins'))
@@ -1752,10 +1775,12 @@ final_message = [
 '''  MNG:                 @0@'''.format(libmng.found()),
 '''  OpenEXR:             @0@'''.format(openexr.found()),
 '''  WebP:                @0@'''.format(webp_found),
-'''  Heif:                @0@ [profile support: @1@@2@]'''
-                                .format(libheif.found(),
+'''  HEIC:                import: @0@ - export: @1@ [profile support: @2@]@3@'''
+                                .format(can_import_heic, can_export_heic,
                                         libheif.version().version_compare('>=1.4.0'),
-                                       libheif_warning != '' ? ' (see warning below)' : ''),
+                                        libheif_warning != '' ? ' (see warning below)' : ''),
+'''  AVIF:                import: @0@ - export: @1@'''
+                                .format(can_import_avif, can_export_avif),
 '''  PDF (export):        @0@'''.format(cairopdf.found()),
 '''  Print:               @0@'''.format(have_print),
 '''  Python 3 plug-ins:   @0@'''.format(have_python),
diff --git a/plug-ins/common/meson.build b/plug-ins/common/meson.build
index 1e11436d0f..f459aa9f92 100644
--- a/plug-ins/common/meson.build
+++ b/plug-ins/common/meson.build
@@ -91,7 +91,7 @@ if libaa.found()
   }
 endif
 
-if libheif.found()
+if have_heif
   common_plugins_list += { 'name': 'file-heif',
     'deps': [ gtk3, gegl, libheif, gexiv2, lcms, ],
   }