From 8d680a695083dc2ed2a84db024e07480ffdb0ac5 Mon Sep 17 00:00:00 2001
From: Matthias Clasen <mclasen@redhat.com>
Date: Mon, 22 Nov 2021 11:22:21 -0500
Subject: More context serialization work

---
 pango/serializer.c    | 64 ++++++++++++++++++++++++++++++++++++++++++++++++---
 tests/testserialize.c |  4 ++--
 2 files changed, 63 insertions(+), 5 deletions(-)

diff --git a/pango/serializer.c b/pango/serializer.c
index 62addc36..fdaba728 100644
--- a/pango/serializer.c
+++ b/pango/serializer.c
@@ -229,6 +229,10 @@ static void
 add_context (JsonBuilder  *builder,
              PangoContext *context)
 {
+  char *str;
+  const PangoMatrix *matrix;
+  PangoMatrix identity = PANGO_MATRIX_INIT;
+
   json_builder_begin_object (builder);
 
   /* Note: since we don't create the context when deserializing,
@@ -236,6 +240,11 @@ add_context (JsonBuilder  *builder,
    * context gets updated as expected.
    */
 
+  str = pango_font_description_to_string (context->font_desc);
+  json_builder_set_member_name (builder, "font");
+  json_builder_add_string_value (builder, str);
+  g_free (str);
+
   if (context->set_language)
     {
       json_builder_set_member_name (builder, "language");
@@ -254,7 +263,19 @@ add_context (JsonBuilder  *builder,
   json_builder_set_member_name (builder, "round-glyph-positions");
   json_builder_add_boolean_value (builder, context->round_glyph_positions);
 
-  /* FIXME transform */
+  json_builder_set_member_name (builder, "transform");
+  matrix = pango_context_get_matrix (context);
+  if (!matrix)
+    matrix = &identity;
+
+  json_builder_begin_array (builder);
+  json_builder_add_double_value (builder, matrix->xx);
+  json_builder_add_double_value (builder, matrix->xy);
+  json_builder_add_double_value (builder, matrix->yx);
+  json_builder_add_double_value (builder, matrix->yy);
+  json_builder_add_double_value (builder, matrix->x0);
+  json_builder_add_double_value (builder, matrix->y0);
+  json_builder_end_array (builder);
 
   json_builder_end_object (builder);
 }
@@ -636,6 +657,8 @@ json_to_attr_list (JsonReader  *reader,
 {
   PangoAttrList *attributes;
 
+  attributes = pango_attr_list_new ();
+
   if (!json_reader_is_array (reader))
     {
       g_set_error (error,
@@ -645,8 +668,6 @@ json_to_attr_list (JsonReader  *reader,
       goto fail;
     }
 
-  attributes = pango_attr_list_new ();
-
   for (int i = 0; i < json_reader_count_elements (reader); i++)
     {
       PangoAttribute *attr;
@@ -726,6 +747,16 @@ apply_json_to_context (JsonReader    *reader,
     }
   json_reader_end_member (reader);
 
+  if (json_reader_read_member (reader, "font"))
+    {
+      PangoFontDescription *desc;
+
+      desc = pango_font_description_from_string (json_reader_get_string_value (reader));
+      pango_context_set_font_description (context, desc);
+      pango_font_description_free (desc);
+    }
+  json_reader_end_member (reader);
+
   if (json_reader_read_member (reader, "base-gravity"))
     {
       PangoGravity gravity = get_enum_value (PANGO_TYPE_GRAVITY,
@@ -771,6 +802,33 @@ apply_json_to_context (JsonReader    *reader,
     }
   json_reader_end_member (reader);
 
+  if (json_reader_read_member (reader, "transform"))
+    {
+      PangoMatrix m;
+
+      json_reader_read_element (reader, 0);
+      m.xx = json_reader_get_double_value (reader);
+      json_reader_end_element (reader);
+      json_reader_read_element (reader, 1);
+      m.xy = json_reader_get_double_value (reader);
+      json_reader_end_element (reader);
+      json_reader_read_element (reader, 2);
+      m.yx = json_reader_get_double_value (reader);
+      json_reader_end_element (reader);
+      json_reader_read_element (reader, 3);
+      m.yy = json_reader_get_double_value (reader);
+      json_reader_end_element (reader);
+      json_reader_read_element (reader, 4);
+      m.x0 = json_reader_get_double_value (reader);
+      json_reader_end_element (reader);
+      json_reader_read_element (reader, 5);
+      m.y0 = json_reader_get_double_value (reader);
+      json_reader_end_element (reader);
+
+      pango_context_set_matrix (context, &m);
+    }
+  json_reader_end_member (reader);
+
   return TRUE;
 }
 
diff --git a/tests/testserialize.c b/tests/testserialize.c
index 43248777..e18df890 100644
--- a/tests/testserialize.c
+++ b/tests/testserialize.c
@@ -247,12 +247,12 @@ test_serialize_layout_context (void)
 {
   const char *test =
     "{\n"
-    "  \"text\" : \"Some fun with layouts!\",\n"
     "  \"context\" : {\n"
     "    \"base-gravity\" : \"east\",\n"
     "    \"language\" : \"de-de\",\n"
     "    \"round-glyph-positions\" : \"false\"\n"
-    "  }\n"
+    "  },\n"
+    "  \"text\" : \"Some fun with layouts!\"\n"
     "}";
 
   PangoContext *context;
-- 
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