From 2f50d873680ce0a43b6ec79df1ac946b91f31e63 Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Wed, 4 Nov 2009 21:07:03 -0500
Subject: [PATCH] Start filling hb_shape() in

---
 src/hb-buffer-private.h |  1 +
 src/hb-shape.c          | 40 +++++++++++++++++++++++++++++++++++++++-
 2 files changed, 40 insertions(+), 1 deletion(-)

diff --git a/src/hb-buffer-private.h b/src/hb-buffer-private.h
index 47f9b8c3..f40b1c58 100644
--- a/src/hb-buffer-private.h
+++ b/src/hb-buffer-private.h
@@ -131,6 +131,7 @@ _hb_buffer_allocate_lig_id (hb_buffer_t *buffer);
 #define IN_GLYPH(pos)		(buffer->in_string[(pos)].codepoint)
 #define IN_INFO(pos)		(&buffer->in_string[(pos)])
 #define IN_CURGLYPH()		(buffer->in_string[buffer->in_pos].codepoint)
+#define IN_NEXTGLYPH()		(buffer->in_string[buffer->in_pos + 1].codepoint)
 #define IN_CURINFO()		(&buffer->in_string[buffer->in_pos])
 #define IN_MASK(pos)		(buffer->in_string[(pos)].mask)
 #define IN_LIGID(pos)		(buffer->in_string[(pos)].lig_id)
diff --git a/src/hb-shape.c b/src/hb-shape.c
index 55e21507..7a0f9795 100644
--- a/src/hb-shape.c
+++ b/src/hb-shape.c
@@ -28,6 +28,35 @@
 
 #include "hb-shape.h"
 
+#include "hb-buffer-private.h"
+
+static inline hb_bool_t
+is_variation_selector (hb_codepoint_t unicode)
+{
+  return (unicode >=  0xFE00 && unicode <= 0xFE0F) ||
+	 (unicode >= 0xE0100 && unicode <= 0xE01EF);
+}
+
+static void
+map_glyphs (hb_face_t    *face,
+	    hb_font_t    *font,
+	    hb_buffer_t  *buffer)
+{
+  unsigned int count;
+
+  count = buffer->in_length - 1;
+
+  for (buffer->in_pos = 0; buffer->in_pos < count; buffer->in_pos++) {
+    if (HB_UNLIKELY (is_variation_selector (IN_NEXTGLYPH()))) {
+      IN_CURGLYPH() = hb_font_get_glyph (face, font, IN_CURGLYPH(), IN_NEXTGLYPH());
+      buffer->in_pos++;
+    } else {
+      IN_CURGLYPH() = hb_font_get_glyph (face, font, IN_CURGLYPH(), 0);
+    }
+  }
+  IN_CURGLYPH() = hb_font_get_glyph (face, font, IN_CURGLYPH(), 0);
+}
+
 
 void
 hb_shape (hb_face_t    *face,
@@ -36,5 +65,14 @@ hb_shape (hb_face_t    *face,
 	  hb_feature_t *features,
 	  unsigned int  num_features)
 {
-}
+  /* form_clusters (buffer); */
+  /* do_mirroring (buffer); */
+  /* natural direction analysis */
+  /* OT preprocess */
+
+  map_glyphs (face, font, buffer);
 
+  /* GSUB */
+  /* Default positioning */
+  /* GPOS / kern */
+}
-- 
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