[pango/pango2] Add defines for native fontmaps

[Matthias Clasen <matthiasc src gnome org>]

commit 4f4c919d6acd12ae9b10b3d17a6370b88195df6a
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Jun 26 11:13:01 2022 -0400

    Add defines for native fontmaps
    
    Add PANGO_HAS_FC/CORE_TEXT/DIRECT_WRITE_FONTMAP macros
    to let apps check for the presence of native fontmaps.

 docs/migrating.md                 | 10 ++++++-
 pango2/meson.build                | 60 ++++++++++++++++++++-------------------
 pango2/pango-utils.h              | 10 +++----
 pango2/pangocairo-context.c       |  6 ++++
 pango2/pangocairo-dwrite-font.cpp |  3 --
 pango2/pangocoretext-fontmap.c    |  5 ++++
 pango2/pangodwrite-fontmap.cpp    |  6 ++++
 pango2/pangofc-fontmap.c          |  6 +++-
 tests/cxx-test.cpp                |  2 +-
 9 files changed, 67 insertions(+), 41 deletions(-)
---
diff --git a/docs/migrating.md b/docs/migrating.md
index fbd0bddb6..7c1e3b372 100644
--- a/docs/migrating.md
+++ b/docs/migrating.md
@@ -64,7 +64,15 @@ the `pangocairo.h` header, and use the APIs that are declared in it.
 There is still a `pango2cairo.pc` file, if you want to be explicit in your
 build configuration about requiring cairo support. If you want to handle
 the possible absence of cairo support at runtime, you can check the
-[const@Pango2.RENDERING_CAIRO] macro before including `pangocairo.h`.
+`PANGO2_HAS_CAIRO` macro before including `pangocairo.h`.
+
+The native fontmap implementations provide their own headers:
+`pangofc-fontmap.h`, `pangocoretext-fontmap.h` and `pangodwrite-fontmap.h`.
+If you want to check for the available fontmaps implementations
+at runtime (even though they are entirely determined by the platform you
+are running on, currently), you can check the `PANGO2_HAS_FC_FONTMAP`,
+`PANGO2_HAS_CORE_TEXT_FONTMAP` and `PANGO2_HAS_DIRECT_WRITE_FONTMAP` macros
+before including the corresponding header file.
 
 ### PangoFontMap changes
 
diff --git a/pango2/meson.build b/pango2/meson.build
index dbe562497..0a3e8d323 100644
--- a/pango2/meson.build
+++ b/pango2/meson.build
@@ -97,6 +97,14 @@ pango_gir_includes = [
   'Gio-2.0'
 ]
 
+pango_features_conf = configuration_data()
+pango_features_conf.set_quoted('PANGO2_VERSION_STRING', meson.project_version())
+pango_features_conf.set('PANGO2_VERSION_MAJOR', pango_major_version)
+pango_features_conf.set('PANGO2_VERSION_MINOR', pango_minor_version)
+pango_features_conf.set('PANGO2_VERSION_MICRO', pango_micro_version)
+pango_features_conf.set('PANGO2_API_VERSION', pango_api_version)
+pango_features_conf.set('PANGO2_CURRENT_MINUS_AGE', '0')
+
 if cairo_dep.found()
   pango_headers += [
     'pangocairo.h',
@@ -116,21 +124,8 @@ if cairo_dep.found()
   pango_gir_includes += [
     'cairo-1.0',
   ]
-endif
-
-if host_system == 'darwin'
-  pango_headers += [
-    'pangocoretext-fontmap.h',
-  ]
 
-  pango_sources += [
-    'pangocoretext-fontmap.c',
-  ]
-  if cairo_dep.found()
-    pango_sources += [
-      'pangocairo-coretext-font.c',
-    ]
-  endif
+  pango_features_conf.set('PANGO2_HAS_CAIRO', 1)
 endif
 
 if host_system == 'linux'
@@ -146,6 +141,26 @@ if host_system == 'linux'
   pango_gir_includes += [
     'fontconfig-2.0',
   ]
+
+  pango_features_conf.set('PANGO2_HAS_FC_FONTMAP', 1)
+endif
+
+if host_system == 'darwin'
+  pango_headers += [
+    'pangocoretext-fontmap.h',
+  ]
+
+  pango_sources += [
+    'pangocoretext-fontmap.c',
+  ]
+
+  if cairo_dep.found()
+    pango_sources += [
+      'pangocairo-coretext-font.c',
+    ]
+  endif
+
+  pango_features_conf.set('PANGO2_HAS_CORE_TEXT_FONTMAP', 1)
 endif
 
 if host_system == 'windows'
@@ -156,16 +171,14 @@ if host_system == 'windows'
   pango_sources += [
     'pangodwrite-fontmap.cpp',
   ]
+
   if cairo_dep.found()
     pango_sources += [
       'pangocairo-dwrite-font.cpp',
     ]
   endif
 
-  pango_deps += [
-    cc.find_library('gdi32'),
-    cc.find_library('dwrite'),
-  ]
+  pango_features_conf.set('PANGO2_HAS_DIRECT_WRITE_FONTMAP', 1)
 endif
 
 pango_installed_headers = pango_headers + [ 'pango-version-macros.h' ]
@@ -173,18 +186,7 @@ pango_installed_headers = pango_headers + [ 'pango-version-macros.h' ]
 install_headers(pango_installed_headers, subdir: pango_api_path)
 
 # Features header
-pango_features_conf = configuration_data()
-pango_features_conf.set('PANGO2_VERSION_MAJOR', pango_major_version)
-pango_features_conf.set('PANGO2_VERSION_MINOR', pango_minor_version)
-pango_features_conf.set('PANGO2_VERSION_MICRO', pango_micro_version)
-pango_features_conf.set('PANGO2_API_VERSION', pango_api_version)
-pango_features_conf.set('PANGO2_CURRENT_MINUS_AGE', '0')
-if cairo_dep.found()
-  pango_features_conf.set('PANGO2_RENDERING_CAIRO', 1)
-endif
-
 pango_features_h = configure_file(
-  input: 'pango-features.h.meson',
   output: 'pango-features.h',
   configuration: pango_features_conf,
   install: true,
diff --git a/pango2/pango-utils.h b/pango2/pango-utils.h
index f5187dc9c..56ba36edf 100644
--- a/pango2/pango-utils.h
+++ b/pango2/pango-utils.h
@@ -21,6 +21,7 @@
 
 #include <stdio.h>
 #include <glib.h>
+#include <pango2/pango-features.h>
 #include <pango2/pango-font.h>
 
 G_BEGIN_DECLS
@@ -34,12 +35,6 @@ void                    pango2_find_paragraph_boundary (const char *text,
                                                         int        *paragraph_delimiter_index,
                                                         int        *next_paragraph_start);
 
-/**
- * PANGO2_RENDERING_CAIRO:
- *
- * Defined to 1 at compile time if Pango2 was built with cairo support.
- */
-
 /* Encode a Pango2 version as an integer */
 /* Pango2 version checking */
 
@@ -64,11 +59,13 @@ void                    pango2_find_paragraph_boundary (const char *text,
  *
  * The version of Pango2 available at compile-time, encoded using PANGO2_VERSION_ENCODE().
  */
+
 /**
  * PANGO2_VERSION_STRING:
  *
  * A string literal containing the version of Pango2 available at compile-time.
  */
+
 /**
  * PANGO2_VERSION_MAJOR:
  *
@@ -89,6 +86,7 @@ void                    pango2_find_paragraph_boundary (const char *text,
         PANGO2_VERSION_MINOR,                    \
         PANGO2_VERSION_MICRO)
 
+
 /* Check that compile-time Pango2 is as new as required */
 /**
  * PANGO2_VERSION_CHECK:
diff --git a/pango2/pangocairo-context.c b/pango2/pangocairo-context.c
index 2346b635f..b632457a6 100644
--- a/pango2/pangocairo-context.c
+++ b/pango2/pangocairo-context.c
@@ -28,6 +28,12 @@
 
 #include <string.h>
 
+/**
+ * PANGO2_HAS_CAIRO:
+ *
+ * Defined to 1 at compile time if Pango was built with cairo support.
+ */
+
 /**
  * pango2_cairo_update_context:
  * @cr: a Cairo context
diff --git a/pango2/pangocairo-dwrite-font.cpp b/pango2/pangocairo-dwrite-font.cpp
index 7068d59f6..2d1317599 100644
--- a/pango2/pangocairo-dwrite-font.cpp
+++ b/pango2/pangocairo-dwrite-font.cpp
@@ -30,7 +30,6 @@
 
 #include "pangocairo-private.h"
 
-/* {{{ DirectWrite PangoCairo utilities */
 cairo_font_face_t *
 create_cairo_dwrite_font_face (Pango2Font *font)
 {
@@ -48,6 +47,4 @@ create_cairo_dwrite_font_face (Pango2Font *font)
 
 #endif /* HAVE_DIRECT_WRITE */
 
-/* }}} */
-
 /* vim:set foldmethod=marker expandtab: */
diff --git a/pango2/pangocoretext-fontmap.c b/pango2/pangocoretext-fontmap.c
index 3b7cdd474..0ee648954 100644
--- a/pango2/pangocoretext-fontmap.c
+++ b/pango2/pangocoretext-fontmap.c
@@ -44,6 +44,11 @@
  * CoreText to populate the fontmap with the available fonts.
  */
 
+/**
+ * PANGO2_HAS_CORE_TEXT_FONTMAP:
+ *
+ * Defined to 1 at compile time if Pango2 was built with CoreText support.
+ */
 
 struct _Pango2CoreTextFontMap
 {
diff --git a/pango2/pangodwrite-fontmap.cpp b/pango2/pangodwrite-fontmap.cpp
index 37307a3d2..9e7d7bfc1 100644
--- a/pango2/pangodwrite-fontmap.cpp
+++ b/pango2/pangodwrite-fontmap.cpp
@@ -45,6 +45,12 @@
  * uses DirectWrite to populate the fontmap with the available fonts.
  */
 
+/**
+ * PANGO2_HAS_DIRECT_WRITE_FONTMAP:
+ *
+ * Defined to 1 at compile time if Pango was built with DirectWrite support.
+ */
+
 
 struct _PangoDirectWriteFontMap
 {
diff --git a/pango2/pangofc-fontmap.c b/pango2/pangofc-fontmap.c
index c3d026e25..d3be561d1 100644
--- a/pango2/pangofc-fontmap.c
+++ b/pango2/pangofc-fontmap.c
@@ -37,7 +37,6 @@
 #include <fontconfig/fontconfig.h>
 #include <hb-ot.h>
 
-
 /**
  * Pango2FcFontMap:
  *
@@ -45,6 +44,11 @@
  * fontconfig to populate the fontmap with the available fonts.
  */
 
+/**
+ * PANGO2_HAS_FC_FONTMAP:
+ *
+ * Defined to 1 at compile time if Pango was built with fontconfig support.
+ */
 
 struct _Pango2FcFontMap
 {
diff --git a/tests/cxx-test.cpp b/tests/cxx-test.cpp
index 3fa1c20d9..3a98321cb 100644
--- a/tests/cxx-test.cpp
+++ b/tests/cxx-test.cpp
@@ -4,7 +4,7 @@
 
 #include <pango2/pango.h>
 
-#if PANGO_RENDERING_CAIRO
+#if PANGO2_HAS_CAIRO
 #include <pango2/pangocairo.h>
 #endif