Cache HarfBuzz font in HBFace

src/ft/face.h

@@ -188,8 +188,6 @@ namespace ft {
     std::map<FT_UInt, Glyph*> m_glyphMap;
   };
 
-  typedef FaceFT<SimpleCache> Face;
-
 } // namespace ft
 
 #endif

src/ft/hb_face.h

@@ -0,0 +1,44 @@
+// Aseprite FreeType Wrapper
+// Copyright (c) 2017 David Capello
+//
+// This file is released under the terms of the MIT license.
+// Read LICENSE.txt for more information.
+
+#ifndef FT_HB_FACE_H_INCLUDED
+#define FT_HB_FACE_H_INCLUDED
+#pragma once
+
+#include "base/string.h"
+#include "ft/face.h"
+
+#include <hb.h>
+#include <hb-ft.h>
+
+namespace ft {
+
+  template<typename FaceFT>
+  class HBFace : public FaceFT {
+  public:
+    HBFace(FT_Face face) : FaceFT(face) {
+      m_font = hb_ft_font_create((FT_Face)face, nullptr);
+      m_buffer = hb_buffer_create();
+    }
+
+    ~HBFace() {
+      if (m_buffer) hb_buffer_destroy(m_buffer);
+      if (m_font) hb_font_destroy(m_font);
+    }
+
+    hb_font_t* font() const { return m_font; }
+    hb_buffer_t* buffer() const { return m_buffer; }
+
+  private:
+    hb_buffer_t* m_buffer;
+    hb_font_t* m_font;
+  };
+
+  typedef HBFace<FaceFT<SimpleCache> > Face;
+
+} // namespace ft
+
+#endif

src/ft/hb_shaper.h

@@ -8,26 +8,14 @@
 #define FT_HB_SHAPER_H_INCLUDED
 #pragma once
 
-#include "ft/face.h"
-
-#include <hb.h>
-#include <hb-ft.h>
-
-#include <string>
+#include "ft/hb_face.h"
 
 namespace ft {
 
-  template<typename FaceFT>
+  template<typename HBFace>
   class HBShaper {
   public:
-    HBShaper(FaceFT& face) {
-      m_font = hb_ft_font_create((FT_Face)face, nullptr);
-      m_buffer = hb_buffer_create();
-    }
-
-    ~HBShaper() {
-      if (m_buffer) hb_buffer_destroy(m_buffer);
-      if (m_font) hb_font_destroy(m_font);
+    HBShaper(HBFace& face) : m_face(face) {
     }
 
     bool initialize(const base::utf8_const_iterator& it,
@@ -36,17 +24,16 @@ namespace ft {
       m_end = end;
       m_index = 0;
 
-      hb_buffer_reset(m_buffer);
+      hb_buffer_reset(m_face.buffer());
       for (auto it=m_it; it!=end; ++it)
-        hb_buffer_add(m_buffer, *it, 0);
-      hb_buffer_set_content_type(m_buffer, HB_BUFFER_CONTENT_TYPE_UNICODE);
-      hb_buffer_set_direction(m_buffer, HB_DIRECTION_LTR);
-      hb_buffer_guess_segment_properties(m_buffer);
+        hb_buffer_add(m_face.buffer(), *it, 0);
+      hb_buffer_set_content_type(m_face.buffer(), HB_BUFFER_CONTENT_TYPE_UNICODE);
+      hb_buffer_set_direction(m_face.buffer(), HB_DIRECTION_LTR);
+      hb_buffer_guess_segment_properties(m_face.buffer());
+      hb_shape(m_face.font(), m_face.buffer(), nullptr, 0);
 
-      hb_shape(m_font, m_buffer, nullptr, 0);
-
-      m_glyphInfo = hb_buffer_get_glyph_infos(m_buffer, &m_glyphCount);
-      m_glyphPos = hb_buffer_get_glyph_positions(m_buffer, &m_glyphCount);
+      m_glyphInfo = hb_buffer_get_glyph_infos(m_face.buffer(), &m_glyphCount);
+      m_glyphPos = hb_buffer_get_glyph_positions(m_face.buffer(), &m_glyphCount);
       return (m_glyphCount > 0);
     }
 
@@ -75,8 +62,7 @@ namespace ft {
     }
 
   private:
-    hb_buffer_t* m_buffer;
-    hb_font_t* m_font;
+    HBFace& m_face;
     hb_glyph_info_t* m_glyphInfo;
     hb_glyph_position_t* m_glyphPos;
     unsigned int m_glyphCount;

src/she/common/freetype_font.h

@@ -8,7 +8,7 @@
 #define SHE_COMMON_FREETYPE_FONT_H_INCLUDED
 #pragma once
 
-#include "ft/face.h"
+#include "ft/hb_face.h"
 #include "ft/lib.h"
 #include "she/font.h"