From 6c27d9d6244303754e111eccc7c1a42df5b9bca1 Mon Sep 17 00:00:00 2001
From: bruvzg <7645683+bruvzg@users.noreply.github.com>
Date: Mon, 4 Jul 2022 09:11:15 +0300
Subject: HarfBuzz: Update to version 4.4.1

---
 thirdparty/harfbuzz/src/hb-ft.cc | 158 +++++++++++++++++++++++++++------------
 1 file changed, 111 insertions(+), 47 deletions(-)

(limited to 'thirdparty/harfbuzz/src/hb-ft.cc')

diff --git a/thirdparty/harfbuzz/src/hb-ft.cc b/thirdparty/harfbuzz/src/hb-ft.cc
index d3c5d3db93..b526a82865 100644
--- a/thirdparty/harfbuzz/src/hb-ft.cc
+++ b/thirdparty/harfbuzz/src/hb-ft.cc
@@ -37,6 +37,8 @@
 #include "hb-font.hh"
 #include "hb-machinery.hh"
 #include "hb-cache.hh"
+#include "hb-ot-os2-table.hh"
+#include "hb-ot-shaper-arabic-pua.hh"
 
 #include FT_ADVANCES_H
 #include FT_MULTIPLE_MASTERS_H
@@ -86,7 +88,7 @@ struct hb_ft_font_t
 
   mutable hb_mutex_t lock;
   FT_Face ft_face;
-  mutable int cached_x_scale;
+  mutable unsigned cached_serial;
   mutable hb_advance_cache_t advance_cache;
 };
 
@@ -103,7 +105,7 @@ _hb_ft_font_create (FT_Face ft_face, bool symbol, bool unref)
 
   ft_font->load_flags = FT_LOAD_DEFAULT | FT_LOAD_NO_HINTING;
 
-  ft_font->cached_x_scale = 0;
+  ft_font->cached_serial = (unsigned) -1;
   ft_font->advance_cache.init ();
 
   return ft_font;
@@ -130,6 +132,58 @@ _hb_ft_font_destroy (void *data)
   hb_free (ft_font);
 }
 
+
+/* hb_font changed, update FT_Face. */
+static void _hb_ft_hb_font_changed (hb_font_t *font, FT_Face ft_face)
+{
+
+  FT_Set_Char_Size (ft_face,
+		    abs (font->x_scale), abs (font->y_scale),
+		    0, 0);
+#if 0
+		    font->x_ppem * 72 * 64 / font->x_scale,
+		    font->y_ppem * 72 * 64 / font->y_scale);
+#endif
+  if (font->x_scale < 0 || font->y_scale < 0)
+  {
+    FT_Matrix matrix = { font->x_scale < 0 ? -1 : +1, 0,
+			  0, font->y_scale < 0 ? -1 : +1};
+    FT_Set_Transform (ft_face, &matrix, nullptr);
+  }
+
+#if defined(HAVE_FT_GET_VAR_BLEND_COORDINATES) && !defined(HB_NO_VAR)
+  unsigned int num_coords;
+  const int *coords = hb_font_get_var_coords_normalized (font, &num_coords);
+  if (num_coords)
+  {
+    FT_Fixed *ft_coords = (FT_Fixed *) hb_calloc (num_coords, sizeof (FT_Fixed));
+    if (ft_coords)
+    {
+      for (unsigned int i = 0; i < num_coords; i++)
+	ft_coords[i] = coords[i] * 4;
+      FT_Set_Var_Blend_Coordinates (ft_face, num_coords, ft_coords);
+      hb_free (ft_coords);
+    }
+  }
+#endif
+}
+
+/* Check if hb_font changed, update FT_Face. */
+static inline bool
+_hb_ft_hb_font_check_changed (hb_font_t *font,
+			      const hb_ft_font_t *ft_font)
+{
+  if (font->serial != ft_font->cached_serial)
+  {
+    _hb_ft_hb_font_changed (font, ft_font->ft_face);
+    ft_font->advance_cache.clear ();
+    ft_font->cached_serial = font->serial;
+    return true;
+  }
+  return false;
+}
+
+
 /**
  * hb_ft_font_set_load_flags:
  * @font: #hb_font_t to work upon
@@ -181,7 +235,7 @@ hb_ft_font_get_load_flags (hb_font_t *font)
 }
 
 /**
- * hb_ft_font_get_face:
+ * hb_ft_font_get_face: (skip)
  * @font: #hb_font_t to work upon
  *
  * Fetches the FT_Face associated with the specified #hb_font_t
@@ -203,7 +257,7 @@ hb_ft_font_get_face (hb_font_t *font)
 }
 
 /**
- * hb_ft_font_lock_face:
+ * hb_ft_font_lock_face: (skip)
  * @font: #hb_font_t to work upon
  *
  * Gets the FT_Face associated with @font, This face will be kept around until
@@ -246,7 +300,7 @@ hb_ft_font_unlock_face (hb_font_t *font)
 
 
 static hb_bool_t
-hb_ft_get_nominal_glyph (hb_font_t *font HB_UNUSED,
+hb_ft_get_nominal_glyph (hb_font_t *font,
 			 void *font_data,
 			 hb_codepoint_t unicode,
 			 hb_codepoint_t *glyph,
@@ -258,14 +312,29 @@ hb_ft_get_nominal_glyph (hb_font_t *font HB_UNUSED,
 
   if (unlikely (!g))
   {
-    if (unlikely (ft_font->symbol) && unicode <= 0x00FFu)
+    if (unlikely (ft_font->symbol))
     {
-      /* For symbol-encoded OpenType fonts, we duplicate the
-       * U+F000..F0FF range at U+0000..U+00FF.  That's what
-       * Windows seems to do, and that's hinted about at:
-       * https://docs.microsoft.com/en-us/typography/opentype/spec/recom
-       * under "Non-Standard (Symbol) Fonts". */
-      g = FT_Get_Char_Index (ft_font->ft_face, 0xF000u + unicode);
+      switch ((unsigned) font->face->table.OS2->get_font_page ()) {
+      case OT::OS2::font_page_t::FONT_PAGE_NONE:
+	if (unicode <= 0x00FFu)
+	  /* For symbol-encoded OpenType fonts, we duplicate the
+	   * U+F000..F0FF range at U+0000..U+00FF.  That's what
+	   * Windows seems to do, and that's hinted about at:
+	   * https://docs.microsoft.com/en-us/typography/opentype/spec/recom
+	   * under "Non-Standard (Symbol) Fonts". */
+	  g = FT_Get_Char_Index (ft_font->ft_face, 0xF000u + unicode);
+	break;
+#ifndef HB_NO_OT_SHAPER_ARABIC_FALLBACK
+      case OT::OS2::font_page_t::FONT_PAGE_SIMP_ARABIC:
+	g = FT_Get_Char_Index (ft_font->ft_face, _hb_arabic_pua_simp_map (unicode));
+	break;
+      case OT::OS2::font_page_t::FONT_PAGE_TRAD_ARABIC:
+	g = FT_Get_Char_Index (ft_font->ft_face, _hb_arabic_pua_trad_map (unicode));
+	break;
+#endif
+      default:
+	break;
+      }
       if (!g)
 	return false;
     }
@@ -337,12 +406,6 @@ hb_ft_get_glyph_h_advances (hb_font_t* font, void* font_data,
   int load_flags = ft_font->load_flags;
   int mult = font->x_scale < 0 ? -1 : +1;
 
-  if (font->x_scale != ft_font->cached_x_scale)
-  {
-    ft_font->advance_cache.clear ();
-    ft_font->cached_x_scale = font->x_scale;
-  }
-
   for (unsigned int i = 0; i < count; i++)
   {
     FT_Fixed v = 0;
@@ -426,6 +489,7 @@ hb_ft_get_glyph_h_kerning (hb_font_t *font,
 			   void *user_data HB_UNUSED)
 {
   const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data;
+  hb_lock_t lock (ft_font->lock);
   FT_Vector kerningv;
 
   FT_Kerning_Mode mode = font->x_ppem ? FT_KERNING_DEFAULT : FT_KERNING_UNFITTED;
@@ -556,6 +620,7 @@ hb_ft_get_font_h_extents (hb_font_t *font HB_UNUSED,
   const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data;
   hb_lock_t lock (ft_font->lock);
   FT_Face ft_face = ft_font->ft_face;
+
   metrics->ascender = FT_MulFix(ft_face->ascender, ft_face->size->metrics.y_scale);
   metrics->descender = FT_MulFix(ft_face->descender, ft_face->size->metrics.y_scale);
   metrics->line_gap = FT_MulFix( ft_face->height, ft_face->size->metrics.y_scale ) - (metrics->ascender - metrics->descender);
@@ -619,6 +684,8 @@ hb_ft_get_glyph_shape (hb_font_t *font HB_UNUSED,
   hb_lock_t lock (ft_font->lock);
   FT_Face ft_face = ft_font->ft_face;
 
+  _hb_ft_hb_font_check_changed (font, ft_font);
+
   if (unlikely (FT_Load_Glyph (ft_face, glyph,
 			       FT_LOAD_NO_BITMAP | ft_font->load_flags)))
     return;
@@ -963,6 +1030,31 @@ hb_ft_font_changed (hb_font_t *font)
 #endif
 }
 
+/**
+ * hb_ft_hb_font_changed:
+ * @font: #hb_font_t to work upon
+ *
+ * Refreshes the state of the underlying FT_Face of @font when the hb_font_t
+ * @font has changed.
+ * This function should be called after changing the size or
+ * variation-axis settings on the @font.
+ * This call is fast if nothing has changed on @font.
+ *
+ * Return value: true if changed, false otherwise
+ *
+ * Since: 4.4.0
+ **/
+hb_bool_t
+hb_ft_hb_font_changed (hb_font_t *font)
+{
+  if (font->destroy != (hb_destroy_func_t) _hb_ft_font_destroy)
+    return false;
+
+  hb_ft_font_t *ft_font = (hb_ft_font_t *) font->user_data;
+
+  return _hb_ft_hb_font_check_changed (font, ft_font);
+}
+
 /**
  * hb_ft_font_create_referenced:
  * @ft_face: FT_Face to work upon
@@ -1081,35 +1173,7 @@ hb_ft_font_set_funcs (hb_font_t *font)
   if (FT_Select_Charmap (ft_face, FT_ENCODING_MS_SYMBOL))
     FT_Select_Charmap (ft_face, FT_ENCODING_UNICODE);
 
-  FT_Set_Char_Size (ft_face,
-		    abs (font->x_scale), abs (font->y_scale),
-		    0, 0);
-#if 0
-		    font->x_ppem * 72 * 64 / font->x_scale,
-		    font->y_ppem * 72 * 64 / font->y_scale);
-#endif
-  if (font->x_scale < 0 || font->y_scale < 0)
-  {
-    FT_Matrix matrix = { font->x_scale < 0 ? -1 : +1, 0,
-			  0, font->y_scale < 0 ? -1 : +1};
-    FT_Set_Transform (ft_face, &matrix, nullptr);
-  }
-
-#if defined(HAVE_FT_GET_VAR_BLEND_COORDINATES) && !defined(HB_NO_VAR)
-  unsigned int num_coords;
-  const int *coords = hb_font_get_var_coords_normalized (font, &num_coords);
-  if (num_coords)
-  {
-    FT_Fixed *ft_coords = (FT_Fixed *) hb_calloc (num_coords, sizeof (FT_Fixed));
-    if (ft_coords)
-    {
-      for (unsigned int i = 0; i < num_coords; i++)
-	ft_coords[i] = coords[i] * 4;
-      FT_Set_Var_Blend_Coordinates (ft_face, num_coords, ft_coords);
-      hb_free (ft_coords);
-    }
-  }
-#endif
+  _hb_ft_hb_font_changed (font, ft_face);
 
   ft_face->generic.data = blob;
   ft_face->generic.finalizer = (FT_Generic_Finalizer) _release_blob;
-- 
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