add a lib for rendering text in sdl2 and rules to make in makefile

SDL2_ttf/external/harfbuzz/util/shape-consumer.hh

@@ -0,0 +1,104 @@
+/*
+ * Copyright © 2011,2012  Google, Inc.
+ *
+ *  This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Google Author(s): Behdad Esfahbod
+ */
+
+#ifndef HB_SHAPE_CONSUMER_HH
+#define HB_SHAPE_CONSUMER_HH
+
+#include "font-options.hh"
+#include "shape-options.hh"
+#include "text-options.hh"
+
+
+template <typename output_t>
+struct shape_consumer_t : shape_options_t
+{
+  void add_options (option_parser_t *parser)
+  {
+    shape_options_t::add_options (parser);
+    output.add_options (parser);
+  }
+
+  template <typename app_t>
+  void init (const app_t *app)
+  {
+    failed = false;
+    buffer = hb_buffer_create ();
+
+    output.init (buffer, app);
+  }
+  template <typename app_t>
+  bool consume_line (app_t &app)
+  {
+    unsigned int text_len;
+    const char *text;
+    if (!(text = app.get_line (&text_len)))
+      return false;
+
+    output.new_line ();
+
+    for (unsigned int n = num_iterations; n; n--)
+    {
+      populate_buffer (buffer, text, text_len, app.text_before, app.text_after, app.font);
+      if (n == 1)
+	output.consume_text (buffer, text, text_len, utf8_clusters);
+
+      const char *error = nullptr;
+      if (!shape (app.font, buffer, &error))
+      {
+	failed = true;
+	output.error (error);
+	if (hb_buffer_get_content_type (buffer) == HB_BUFFER_CONTENT_TYPE_GLYPHS)
+	  break;
+	else
+	  return true;
+      }
+    }
+
+    if (glyphs)
+      output.consume_glyphs (buffer, nullptr, 0, false);
+    else
+      output.consume_glyphs (buffer, text, text_len, utf8_clusters);
+    return true;
+  }
+  template <typename app_t>
+  void finish (const app_t *app)
+  {
+    output.finish (buffer, app);
+    hb_buffer_destroy (buffer);
+    buffer = nullptr;
+  }
+
+  public:
+  bool failed = false;
+
+  protected:
+  output_t output;
+
+  hb_buffer_t *buffer = nullptr;
+};
+
+
+#endif