src/hb-ot-font.cc - third_party/harfbuzz - Git at Google

 /*
  * Copyright © 2011,2014  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, Roozbeh Pournader
  */

 #include "hb-private.hh"

 #include "hb-ot.h"

 #include "hb-font-private.hh"

 #include "hb-ot-cmap-table.hh"
 #include "hb-ot-cbdt-table.hh"
 #include "hb-ot-glyf-table.hh"
 #include "hb-ot-hmtx-table.hh"
 #include "hb-ot-kern-table.hh"
 #include "hb-ot-post-table.hh"


 struct hb_ot_font_t
 {
   OT::cmap::accelerator_t cmap;
   OT::hmtx::accelerator_t h_metrics;
   OT::vmtx::accelerator_t v_metrics;
   OT::hb_lazy_loader_t<OT::glyf::accelerator_t> glyf;
   OT::hb_lazy_loader_t<OT::CBDT::accelerator_t> cbdt;
   OT::hb_lazy_loader_t<OT::post::accelerator_t> post;
   OT::hb_lazy_loader_t<OT::kern::accelerator_t> kern;
 };


 static hb_ot_font_t *
 _hb_ot_font_create (hb_face_t *face)
 {
   hb_ot_font_t *ot_font = (hb_ot_font_t *) calloc (1, sizeof (hb_ot_font_t));

   if (unlikely (!ot_font))
     return nullptr;

   ot_font->cmap.init (face);
   ot_font->h_metrics.init (face);
   ot_font->v_metrics.init (face, ot_font->h_metrics.ascender - ot_font->h_metrics.descender); /* TODO Can we do this lazily? */
   ot_font->glyf.init (face);
   ot_font->cbdt.init (face);
   ot_font->post.init (face);
   ot_font->kern.init (face);

   return ot_font;
 }

 static void
 _hb_ot_font_destroy (void *data)
 {
   hb_ot_font_t *ot_font = (hb_ot_font_t *) data;

   ot_font->cmap.fini ();
   ot_font->h_metrics.fini ();
   ot_font->v_metrics.fini ();
   ot_font->glyf.fini ();
   ot_font->cbdt.fini ();
   ot_font->post.fini ();
   ot_font->kern.fini ();

   free (ot_font);
 }


 static hb_bool_t
 hb_ot_get_nominal_glyph (hb_font_t *font HB_UNUSED,
 			 void *font_data,
 			 hb_codepoint_t unicode,
 			 hb_codepoint_t *glyph,
 			 void *user_data HB_UNUSED)

 {
   const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
   return ot_font->cmap.get_nominal_glyph (unicode, glyph);
 }

 static hb_bool_t
 hb_ot_get_variation_glyph (hb_font_t *font HB_UNUSED,
 			   void *font_data,
 			   hb_codepoint_t unicode,
 			   hb_codepoint_t variation_selector,
 			   hb_codepoint_t *glyph,
 			   void *user_data HB_UNUSED)
 {
   const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
   return ot_font->cmap.get_variation_glyph (unicode, variation_selector, glyph);
 }

 static hb_position_t
 hb_ot_get_glyph_h_advance (hb_font_t *font,
 			   void *font_data,
 			   hb_codepoint_t glyph,
 			   void *user_data HB_UNUSED)
 {
   const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
   return font->em_scale_x (ot_font->h_metrics.get_advance (glyph, font));
 }

 static hb_position_t
 hb_ot_get_glyph_v_advance (hb_font_t *font,
 			   void *font_data,
 			   hb_codepoint_t glyph,
 			   void *user_data HB_UNUSED)
 {
   const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
   return font->em_scale_y (-(int) ot_font->v_metrics.get_advance (glyph, font));
 }

 static hb_position_t
 hb_ot_get_glyph_h_kerning (hb_font_t *font,
 			   void *font_data,
 			   hb_codepoint_t left_glyph,
 			   hb_codepoint_t right_glyph,
 			   void *user_data HB_UNUSED)
 {
   const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
   return font->em_scale_x (ot_font->kern->get_h_kerning (left_glyph, right_glyph));
 }

 static hb_bool_t
 hb_ot_get_glyph_extents (hb_font_t *font HB_UNUSED,
 			 void *font_data,
 			 hb_codepoint_t glyph,
 			 hb_glyph_extents_t *extents,
 			 void *user_data HB_UNUSED)
 {
   const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
   bool ret = ot_font->glyf->get_extents (glyph, extents);
   if (!ret)
     ret = ot_font->cbdt->get_extents (glyph, extents);
   // TODO Hook up side-bearings variations.
   extents->x_bearing = font->em_scale_x (extents->x_bearing);
   extents->y_bearing = font->em_scale_y (extents->y_bearing);
   extents->width     = font->em_scale_x (extents->width);
   extents->height    = font->em_scale_y (extents->height);
   return ret;
 }

 static hb_bool_t
 hb_ot_get_glyph_name (hb_font_t *font HB_UNUSED,
                       void *font_data,
                       hb_codepoint_t glyph,
                       char *name, unsigned int size,
                       void *user_data HB_UNUSED)
 {
   const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
   return ot_font->post->get_glyph_name (glyph, name, size);
 }

 static hb_bool_t
 hb_ot_get_glyph_from_name (hb_font_t *font HB_UNUSED,
                            void *font_data,
                            const char *name, int len,
                            hb_codepoint_t *glyph,
                            void *user_data HB_UNUSED)
 {
   const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
   return ot_font->post->get_glyph_from_name (name, len, glyph);
 }

 static hb_bool_t
 hb_ot_get_font_h_extents (hb_font_t *font HB_UNUSED,
 			  void *font_data,
 			  hb_font_extents_t *metrics,
 			  void *user_data HB_UNUSED)
 {
   const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
   metrics->ascender = font->em_scale_y (ot_font->h_metrics.ascender);
   metrics->descender = font->em_scale_y (ot_font->h_metrics.descender);
   metrics->line_gap = font->em_scale_y (ot_font->h_metrics.line_gap);
   // TODO Hook up variations.
   return ot_font->h_metrics.has_font_extents;
 }

 static hb_bool_t
 hb_ot_get_font_v_extents (hb_font_t *font HB_UNUSED,
 			  void *font_data,
 			  hb_font_extents_t *metrics,
 			  void *user_data HB_UNUSED)
 {
   const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
   metrics->ascender = font->em_scale_x (ot_font->v_metrics.ascender);
   metrics->descender = font->em_scale_x (ot_font->v_metrics.descender);
   metrics->line_gap = font->em_scale_x (ot_font->v_metrics.line_gap);
   // TODO Hook up variations.
   return ot_font->v_metrics.has_font_extents;
 }

 static hb_font_funcs_t *static_ot_funcs = nullptr;

 #ifdef HB_USE_ATEXIT
 static
 void free_static_ot_funcs (void)
 {
   hb_font_funcs_destroy (static_ot_funcs);
 }
 #endif

 static hb_font_funcs_t *
 _hb_ot_get_font_funcs (void)
 {
 retry:
   hb_font_funcs_t *funcs = (hb_font_funcs_t *) hb_atomic_ptr_get (&static_ot_funcs);

   if (unlikely (!funcs))
   {
     funcs = hb_font_funcs_create ();

     hb_font_funcs_set_font_h_extents_func (funcs, hb_ot_get_font_h_extents, nullptr, nullptr);
     hb_font_funcs_set_font_v_extents_func (funcs, hb_ot_get_font_v_extents, nullptr, nullptr);
     hb_font_funcs_set_nominal_glyph_func (funcs, hb_ot_get_nominal_glyph, nullptr, nullptr);
     hb_font_funcs_set_variation_glyph_func (funcs, hb_ot_get_variation_glyph, nullptr, nullptr);
     hb_font_funcs_set_glyph_h_advance_func (funcs, hb_ot_get_glyph_h_advance, nullptr, nullptr);
     hb_font_funcs_set_glyph_v_advance_func (funcs, hb_ot_get_glyph_v_advance, nullptr, nullptr);
     //hb_font_funcs_set_glyph_h_origin_func (funcs, hb_ot_get_glyph_h_origin, nullptr, nullptr);
     //hb_font_funcs_set_glyph_v_origin_func (funcs, hb_ot_get_glyph_v_origin, nullptr, nullptr);
     hb_font_funcs_set_glyph_h_kerning_func (funcs, hb_ot_get_glyph_h_kerning, nullptr, nullptr);
     //hb_font_funcs_set_glyph_v_kerning_func (funcs, hb_ot_get_glyph_v_kerning, nullptr, nullptr);
     hb_font_funcs_set_glyph_extents_func (funcs, hb_ot_get_glyph_extents, nullptr, nullptr);
     //hb_font_funcs_set_glyph_contour_point_func (funcs, hb_ot_get_glyph_contour_point, nullptr, nullptr);
     hb_font_funcs_set_glyph_name_func (funcs, hb_ot_get_glyph_name, nullptr, nullptr);
     hb_font_funcs_set_glyph_from_name_func (funcs, hb_ot_get_glyph_from_name, nullptr, nullptr);

     hb_font_funcs_make_immutable (funcs);

     if (!hb_atomic_ptr_cmpexch (&static_ot_funcs, nullptr, funcs)) {
       hb_font_funcs_destroy (funcs);
       goto retry;
     }

 #ifdef HB_USE_ATEXIT
     atexit (free_static_ot_funcs); /* First person registers atexit() callback. */
 #endif
   };

   return funcs;
 }


 /**
  * hb_ot_font_set_funcs:
  *
  * Since: 0.9.28
  **/
 void
 hb_ot_font_set_funcs (hb_font_t *font)
 {
   hb_ot_font_t *ot_font = _hb_ot_font_create (font->face);
   if (unlikely (!ot_font))
     return;

   hb_font_set_funcs (font,
 		     _hb_ot_get_font_funcs (),
 		     ot_font,
 		     _hb_ot_font_destroy);
 }
	/*
	* Copyright © 2011,2014 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, Roozbeh Pournader
	*/

	#include "hb-private.hh"

	#include "hb-ot.h"

	#include "hb-font-private.hh"

	#include "hb-ot-cmap-table.hh"
	#include "hb-ot-cbdt-table.hh"
	#include "hb-ot-glyf-table.hh"
	#include "hb-ot-hmtx-table.hh"
	#include "hb-ot-kern-table.hh"
	#include "hb-ot-post-table.hh"


	struct hb_ot_font_t
	{
	OT::cmap::accelerator_t cmap;
	OT::hmtx::accelerator_t h_metrics;
	OT::vmtx::accelerator_t v_metrics;
	OT::hb_lazy_loader_t<OT::glyf::accelerator_t> glyf;
	OT::hb_lazy_loader_t<OT::CBDT::accelerator_t> cbdt;
	OT::hb_lazy_loader_t<OT::post::accelerator_t> post;
	OT::hb_lazy_loader_t<OT::kern::accelerator_t> kern;
	};


	static hb_ot_font_t *
	_hb_ot_font_create (hb_face_t *face)
	{
	hb_ot_font_t ot_font = (hb_ot_font_t ) calloc (1, sizeof (hb_ot_font_t));

	if (unlikely (!ot_font))
	return nullptr;

	ot_font->cmap.init (face);
	ot_font->h_metrics.init (face);
	ot_font->v_metrics.init (face, ot_font->h_metrics.ascender - ot_font->h_metrics.descender); /* TODO Can we do this lazily? */
	ot_font->glyf.init (face);
	ot_font->cbdt.init (face);
	ot_font->post.init (face);
	ot_font->kern.init (face);

	return ot_font;
	}

	static void
	_hb_ot_font_destroy (void *data)
	{
	hb_ot_font_t ot_font = (hb_ot_font_t ) data;

	ot_font->cmap.fini ();
	ot_font->h_metrics.fini ();
	ot_font->v_metrics.fini ();
	ot_font->glyf.fini ();
	ot_font->cbdt.fini ();
	ot_font->post.fini ();
	ot_font->kern.fini ();

	free (ot_font);
	}


	static hb_bool_t
	hb_ot_get_nominal_glyph (hb_font_t *font HB_UNUSED,
	void *font_data,
	hb_codepoint_t unicode,
	hb_codepoint_t *glyph,
	void *user_data HB_UNUSED)

	{
	const hb_ot_font_t ot_font = (const hb_ot_font_t ) font_data;
	return ot_font->cmap.get_nominal_glyph (unicode, glyph);
	}

	static hb_bool_t
	hb_ot_get_variation_glyph (hb_font_t *font HB_UNUSED,
	void *font_data,
	hb_codepoint_t unicode,
	hb_codepoint_t variation_selector,
	hb_codepoint_t *glyph,
	void *user_data HB_UNUSED)
	{
	const hb_ot_font_t ot_font = (const hb_ot_font_t ) font_data;
	return ot_font->cmap.get_variation_glyph (unicode, variation_selector, glyph);
	}

	static hb_position_t
	hb_ot_get_glyph_h_advance (hb_font_t *font,
	void *font_data,
	hb_codepoint_t glyph,
	void *user_data HB_UNUSED)
	{
	const hb_ot_font_t ot_font = (const hb_ot_font_t ) font_data;
	return font->em_scale_x (ot_font->h_metrics.get_advance (glyph, font));
	}

	static hb_position_t
	hb_ot_get_glyph_v_advance (hb_font_t *font,
	void *font_data,
	hb_codepoint_t glyph,
	void *user_data HB_UNUSED)
	{
	const hb_ot_font_t ot_font = (const hb_ot_font_t ) font_data;
	return font->em_scale_y (-(int) ot_font->v_metrics.get_advance (glyph, font));
	}

	static hb_position_t
	hb_ot_get_glyph_h_kerning (hb_font_t *font,
	void *font_data,
	hb_codepoint_t left_glyph,
	hb_codepoint_t right_glyph,
	void *user_data HB_UNUSED)
	{
	const hb_ot_font_t ot_font = (const hb_ot_font_t ) font_data;
	return font->em_scale_x (ot_font->kern->get_h_kerning (left_glyph, right_glyph));
	}

	static hb_bool_t
	hb_ot_get_glyph_extents (hb_font_t *font HB_UNUSED,
	void *font_data,
	hb_codepoint_t glyph,
	hb_glyph_extents_t *extents,
	void *user_data HB_UNUSED)
	{
	const hb_ot_font_t ot_font = (const hb_ot_font_t ) font_data;
	bool ret = ot_font->glyf->get_extents (glyph, extents);
	if (!ret)
	ret = ot_font->cbdt->get_extents (glyph, extents);
	// TODO Hook up side-bearings variations.
	extents->x_bearing = font->em_scale_x (extents->x_bearing);
	extents->y_bearing = font->em_scale_y (extents->y_bearing);
	extents->width = font->em_scale_x (extents->width);
	extents->height = font->em_scale_y (extents->height);
	return ret;
	}

	static hb_bool_t
	hb_ot_get_glyph_name (hb_font_t *font HB_UNUSED,
	void *font_data,
	hb_codepoint_t glyph,
	char *name, unsigned int size,
	void *user_data HB_UNUSED)
	{
	const hb_ot_font_t ot_font = (const hb_ot_font_t ) font_data;
	return ot_font->post->get_glyph_name (glyph, name, size);
	}

	static hb_bool_t
	hb_ot_get_glyph_from_name (hb_font_t *font HB_UNUSED,
	void *font_data,
	const char *name, int len,
	hb_codepoint_t *glyph,
	void *user_data HB_UNUSED)
	{
	const hb_ot_font_t ot_font = (const hb_ot_font_t ) font_data;
	return ot_font->post->get_glyph_from_name (name, len, glyph);
	}

	static hb_bool_t
	hb_ot_get_font_h_extents (hb_font_t *font HB_UNUSED,
	void *font_data,
	hb_font_extents_t *metrics,
	void *user_data HB_UNUSED)
	{
	const hb_ot_font_t ot_font = (const hb_ot_font_t ) font_data;
	metrics->ascender = font->em_scale_y (ot_font->h_metrics.ascender);
	metrics->descender = font->em_scale_y (ot_font->h_metrics.descender);
	metrics->line_gap = font->em_scale_y (ot_font->h_metrics.line_gap);
	// TODO Hook up variations.
	return ot_font->h_metrics.has_font_extents;
	}

	static hb_bool_t
	hb_ot_get_font_v_extents (hb_font_t *font HB_UNUSED,
	void *font_data,
	hb_font_extents_t *metrics,
	void *user_data HB_UNUSED)
	{
	const hb_ot_font_t ot_font = (const hb_ot_font_t ) font_data;
	metrics->ascender = font->em_scale_x (ot_font->v_metrics.ascender);
	metrics->descender = font->em_scale_x (ot_font->v_metrics.descender);
	metrics->line_gap = font->em_scale_x (ot_font->v_metrics.line_gap);
	// TODO Hook up variations.
	return ot_font->v_metrics.has_font_extents;
	}

	static hb_font_funcs_t *static_ot_funcs = nullptr;

	#ifdef HB_USE_ATEXIT
	static
	void free_static_ot_funcs (void)
	{
	hb_font_funcs_destroy (static_ot_funcs);
	}
	#endif

	static hb_font_funcs_t *
	_hb_ot_get_font_funcs (void)
	{
	retry:
	hb_font_funcs_t funcs = (hb_font_funcs_t ) hb_atomic_ptr_get (&static_ot_funcs);

	if (unlikely (!funcs))
	{
	funcs = hb_font_funcs_create ();

	hb_font_funcs_set_font_h_extents_func (funcs, hb_ot_get_font_h_extents, nullptr, nullptr);
	hb_font_funcs_set_font_v_extents_func (funcs, hb_ot_get_font_v_extents, nullptr, nullptr);
	hb_font_funcs_set_nominal_glyph_func (funcs, hb_ot_get_nominal_glyph, nullptr, nullptr);
	hb_font_funcs_set_variation_glyph_func (funcs, hb_ot_get_variation_glyph, nullptr, nullptr);
	hb_font_funcs_set_glyph_h_advance_func (funcs, hb_ot_get_glyph_h_advance, nullptr, nullptr);
	hb_font_funcs_set_glyph_v_advance_func (funcs, hb_ot_get_glyph_v_advance, nullptr, nullptr);
	//hb_font_funcs_set_glyph_h_origin_func (funcs, hb_ot_get_glyph_h_origin, nullptr, nullptr);
	//hb_font_funcs_set_glyph_v_origin_func (funcs, hb_ot_get_glyph_v_origin, nullptr, nullptr);
	hb_font_funcs_set_glyph_h_kerning_func (funcs, hb_ot_get_glyph_h_kerning, nullptr, nullptr);
	//hb_font_funcs_set_glyph_v_kerning_func (funcs, hb_ot_get_glyph_v_kerning, nullptr, nullptr);
	hb_font_funcs_set_glyph_extents_func (funcs, hb_ot_get_glyph_extents, nullptr, nullptr);
	//hb_font_funcs_set_glyph_contour_point_func (funcs, hb_ot_get_glyph_contour_point, nullptr, nullptr);
	hb_font_funcs_set_glyph_name_func (funcs, hb_ot_get_glyph_name, nullptr, nullptr);
	hb_font_funcs_set_glyph_from_name_func (funcs, hb_ot_get_glyph_from_name, nullptr, nullptr);

	hb_font_funcs_make_immutable (funcs);

	if (!hb_atomic_ptr_cmpexch (&static_ot_funcs, nullptr, funcs)) {
	hb_font_funcs_destroy (funcs);
	goto retry;
	}

	#ifdef HB_USE_ATEXIT
	atexit (free_static_ot_funcs); /* First person registers atexit() callback. */
	#endif
	};

	return funcs;
	}


	/**
	* hb_ot_font_set_funcs:
	*
	* Since: 0.9.28
	**/
	void
	hb_ot_font_set_funcs (hb_font_t *font)
	{
	hb_ot_font_t *ot_font = _hb_ot_font_create (font->face);
	if (unlikely (!ot_font))
	return;

	hb_font_set_funcs (font,
	_hb_ot_get_font_funcs (),
	ot_font,
	_hb_ot_font_destroy);
	}