[pango: 7/8] Add a shape test

[Matthias Clasen <matthiasc src gnome org>]

commit 23fc0fb84c929785f4092d67810da3c785502593
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Jul 11 17:17:35 2019 -0400

    Add a shape test
    
    This is similar in spirit to hb-shape. Take an
    input and produce a sequence of glyphs as output.
    
    There are no testcases yet.

 tests/meson.build  |   1 +
 tests/test-shape.c | 297 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 298 insertions(+)
---
diff --git a/tests/meson.build b/tests/meson.build
index f625a466..e1539299 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -40,6 +40,7 @@ if cairo_dep.found()
     [ 'markup-parse', [ 'markup-parse.c' , 'test-common.c' ], [ libpangocairo_dep ] ],
     [ 'test-layout', [ 'test-layout.c', 'test-common.c' ], [ libpangocairo_dep ] ],
     [ 'test-itemize', [ 'test-itemize.c', 'test-common.c' ], [ libpangocairo_dep ] ],
+    [ 'test-shape', [ 'test-shape.c', 'test-common.c' ], [ libpangocairo_dep ] ],
     [ 'test-font', [ 'test-font.c' ], [ libpangocairo_dep ] ],
     [ 'testattributes', [ 'testattributes.c', 'test-common.c' ], [ libpangocairo_dep ] ],
   ]
diff --git a/tests/test-shape.c b/tests/test-shape.c
new file mode 100644
index 00000000..da9b8ff5
--- /dev/null
+++ b/tests/test-shape.c
@@ -0,0 +1,297 @@
+/* Pango
+ * test-shape.c: Test Pango shaping
+ *
+ * Copyright (C) 2019 Red Hat, Inc
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.         See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include <glib.h>
+#include <string.h>
+#include <locale.h>
+
+#ifndef G_OS_WIN32
+#include <unistd.h>
+#endif
+
+#include "config.h"
+#include <pango/pangocairo.h>
+#include "test-common.h"
+
+
+static PangoContext *context;
+
+static void
+append_text (GString    *s,
+             const char *text,
+             int         len)
+{
+  char *p;
+
+  for (p = text; p < text + len; p = g_utf8_next_char (p))
+    {
+      gunichar ch = g_utf8_get_char (p);
+      if (ch == ' ')
+        g_string_append (s, "[ ]");
+      if (ch == 0x0A || ch == 0x2028 || !g_unichar_isprint (ch))
+        g_string_append_printf (s, "[%#04x]", ch);
+      else
+        g_string_append_unichar (s, ch);
+    }
+}
+
+static void
+parse_params (const char *str,
+              gboolean *insert_hyphen)
+{
+  char **strings;
+  int i;
+
+  strings = g_strsplit (str, ",", -1);
+  for (i = 0; strings[i]; i++)
+    {
+      char **str2 = g_strsplit (strings[i], "=", -1);
+      if (strcmp (str2[0], "insert-hyphen") == 0)
+        *insert_hyphen = strcmp (str2[1], "true") == 0;
+      g_strfreev (str2);
+    }
+  g_strfreev (strings);
+}
+
+static void
+test_file (const gchar *filename, GString *string)
+{
+  gchar *contents;
+  gsize  length;
+  GError *error = NULL;
+  char *test;
+  char *text;
+  PangoAttrList *attrs;
+  GList *items, *l;
+  GString *s1, *s2, *s3, *s5, *s6;
+  gboolean insert_hyphen = FALSE;
+  char *p, *p1;
+  const char *sep = "";
+
+  if (!g_file_get_contents (filename, &contents, &length, &error))
+    {
+      fprintf (stderr, "%s\n", error->message);
+      g_error_free (error);
+      return;
+    }
+
+  test = contents;
+
+  /* Skip initial comments */
+  while (test[0] == '#')
+    test = strchr (test, '\n') + 1;
+
+  p = strchr (test, '\n');
+  *p = '\0';
+
+  parse_params (test, &insert_hyphen);
+  test  = p + 1;
+
+  if (!pango_parse_markup (test, -1, 0, &attrs, &text, NULL, &error))
+    {
+      fprintf (stderr, "%s\n", error->message);
+      g_error_free (error);
+      return;
+    }
+
+  s1 = g_string_new ("Text:     ");
+  s2 = g_string_new ("Glyphs:   ");
+  s3 = g_string_new ("Cluster:  ");
+  s5 = g_string_new ("Direction: ");
+  s6 = g_string_new ("Item:      ");
+
+  length = strlen (text);
+  if (text[length - 1] == '\n')
+    length--;
+
+  items = pango_itemize (context, text, 0, length, attrs, NULL);
+
+  pango_attr_list_unref (attrs);
+
+  for (l = items; l; l = l->next)
+    {
+      PangoItem *item = l->data;
+      PangoGlyphString *glyphs;
+      gboolean rtl = item->analysis.level % 2;
+      int i;
+
+      glyphs = pango_glyph_string_new ();
+      pango_shape_full (text + item->offset, item->length, text, length, &item->analysis, glyphs);
+
+      g_string_append (s1, sep);
+      g_string_append (s2, sep);
+      g_string_append (s3, sep);
+      g_string_append (s5, sep);
+      g_string_append (s6, sep);
+      sep = "|";
+
+      g_string_append_printf (s6, "%d(%d)", item->num_chars, item->length);
+
+      for (i = 0; i < glyphs->num_glyphs; i++)
+        {
+          int len;
+          PangoGlyphInfo *gi = &glyphs->glyphs[i];
+
+          char *p;
+          p = text + item->offset + glyphs->log_clusters[i];
+          if (rtl)
+            {
+              if (i > 0)
+                p1 = text + item->offset + glyphs->log_clusters[i - 1];
+              else
+                p1 = g_utf8_next_char (p);
+            }
+          else
+            {
+              if (i + 1 < glyphs->num_glyphs)
+                p1 = text + item->offset + glyphs->log_clusters[i + 1];
+              else
+                p1 = g_utf8_next_char (p);
+            }
+          append_text (s1, p, p1 - p);
+          g_string_append_printf (s2, "[%x]", gi->glyph);
+          if (gi->attr.is_cluster_start)
+            g_string_append_printf (s3, "%d", item->offset + glyphs->log_clusters[i]);
+          g_string_append (s5, rtl ? "<" : ">");
+          len = 0;
+          len = MAX (len, g_utf8_strlen (s1->str, s1->len));
+          len = MAX (len, g_utf8_strlen (s2->str, s2->len));
+          len = MAX (len, g_utf8_strlen (s3->str, s3->len));
+          len = MAX (len, g_utf8_strlen (s5->str, s5->len));
+          len = MAX (len, g_utf8_strlen (s6->str, s6->len));
+          g_string_append_printf (s1, "%*s", len - (int)g_utf8_strlen (s1->str, s1->len), "");
+          g_string_append_printf (s2, "%*s", len - (int)g_utf8_strlen (s2->str, s2->len), "");
+          g_string_append_printf (s3, "%*s", len - (int)g_utf8_strlen (s3->str, s3->len), "");
+          g_string_append_printf (s5, "%*s", len - (int)g_utf8_strlen (s5->str, s5->len), "");
+          g_string_append_printf (s6, "%*s", len - (int)g_utf8_strlen (s6->str, s6->len), "");
+        }
+
+      pango_glyph_string_free (glyphs);
+    }
+
+  g_string_append_printf (string, "%s\n", test);
+  g_string_append_printf (string, "%s\n", s6->str);
+  g_string_append_printf (string, "%s\n", s1->str);
+  g_string_append_printf (string, "%s\n", s2->str);
+  g_string_append_printf (string, "%s\n", s3->str);
+  g_string_append_printf (string, "%s\n", s5->str);
+
+  g_string_free (s1, TRUE);
+  g_string_free (s2, TRUE);
+  g_string_free (s3, TRUE);
+  g_string_free (s5, TRUE);
+  g_string_free (s6, TRUE);
+
+  g_list_free_full (items, (GDestroyNotify)pango_item_free);
+  g_free (contents);
+  g_free (text);
+}
+
+static gchar *
+get_expected_filename (const gchar *filename)
+{
+  gchar *f, *p, *expected;
+
+  f = g_strdup (filename);
+  p = strstr (f, ".shape");
+  if (p)
+    *p = 0;
+  expected = g_strconcat (f, ".expected", NULL);
+
+  g_free (f);
+
+  return expected;
+}
+
+static void
+test_itemize (gconstpointer d)
+{
+  const gchar *filename = d;
+  gchar *expected_file;
+  GError *error = NULL;
+  GString *dump;
+  gchar *diff;
+
+  expected_file = get_expected_filename (filename);
+
+  dump = g_string_sized_new (0);
+
+  test_file (filename, dump);
+
+  diff = diff_with_file (expected_file, dump->str, dump->len, &error);
+  g_assert_no_error (error);
+
+  if (diff && diff[0])
+    {
+      g_printerr ("Contents don't match expected contents:\n%s", diff);
+      g_test_fail ();
+      g_free (diff);
+    }
+
+  g_string_free (dump, TRUE);
+  g_free (expected_file);
+}
+
+int
+main (int argc, char *argv[])
+{
+  GDir *dir;
+  GError *error = NULL;
+  const gchar *name;
+  gchar *path;
+
+  g_setenv ("LC_ALL", "en_US.UTF-8", TRUE);
+  setlocale (LC_ALL, "");
+
+  g_test_init (&argc, &argv, NULL);
+
+  context = pango_font_map_create_context (pango_cairo_font_map_get_default ());
+
+  /* allow to easily generate expected output for new test cases */
+  if (argc > 1)
+    {
+      GString *string;
+
+      string = g_string_sized_new (0);
+      test_file (argv[1], string);
+      printf ("%s", string->str);
+
+      return 0;
+    }
+
+  path = g_test_build_filename (G_TEST_DIST, "itemize", NULL);
+  dir = g_dir_open (path, 0, &error);
+  g_free (path);
+  g_assert_no_error (error);
+  while ((name = g_dir_read_name (dir)) != NULL)
+    {
+      if (!strstr (name, "items"))
+        continue;
+
+      path = g_strdup_printf ("/shape/%s", name);
+      g_test_add_data_func_full (path, g_test_build_filename (G_TEST_DIST, "shape", name, NULL),
+                                 test_itemize, g_free);
+      g_free (path);
+    }
+  g_dir_close (dir);
+
+  return g_test_run ();
+}