src/hb-draw.cc - third_party/harfbuzz - Git at Google

 /*
  * Copyright © 2019-2020  Ebrahim Byagowi
  *
  *  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.
  */

 #include "hb.hh"

 #ifndef HB_NO_DRAW
 #ifdef HB_EXPERIMENTAL_API

 #include "hb-draw.hh"
 #include "hb-ot.h"
 #include "hb-ot-glyf-table.hh"
 #include "hb-ot-cff1-table.hh"
 #include "hb-ot-cff2-table.hh"

 /**
  * hb_draw_funcs_set_move_to_func:
  * @funcs: draw functions object
  * @move_to: move-to callback
  *
  * Sets move-to callback to the draw functions object.
  *
  * Since: EXPERIMENTAL
  **/
 void
 hb_draw_funcs_set_move_to_func (hb_draw_funcs_t        *funcs,
 				hb_draw_move_to_func_t  move_to)
 {
   if (unlikely (hb_object_is_immutable (funcs))) return;
   funcs->move_to = move_to;
 }

 /**
  * hb_draw_funcs_set_line_to_func:
  * @funcs: draw functions object
  * @line_to: line-to callback
  *
  * Sets line-to callback to the draw functions object.
  *
  * Since: EXPERIMENTAL
  **/
 void
 hb_draw_funcs_set_line_to_func (hb_draw_funcs_t        *funcs,
 				hb_draw_line_to_func_t  line_to)
 {
   if (unlikely (hb_object_is_immutable (funcs))) return;
   funcs->line_to = line_to;
 }

 /**
  * hb_draw_funcs_set_quadratic_to_func:
  * @funcs: draw functions object
  * @move_to: quadratic-to callback
  *
  * Sets quadratic-to callback to the draw functions object.
  *
  * Since: EXPERIMENTAL
  **/
 void
 hb_draw_funcs_set_quadratic_to_func (hb_draw_funcs_t             *funcs,
 				     hb_draw_quadratic_to_func_t  quadratic_to)
 {
   if (unlikely (hb_object_is_immutable (funcs))) return;
   funcs->quadratic_to = quadratic_to;
   funcs->is_quadratic_to_set = true;
 }

 /**
  * hb_draw_funcs_set_cubic_to_func:
  * @funcs: draw functions
  * @cubic_to: cubic-to callback
  *
  * Sets cubic-to callback to the draw functions object.
  *
  * Since: EXPERIMENTAL
  **/
 void
 hb_draw_funcs_set_cubic_to_func (hb_draw_funcs_t         *funcs,
 				 hb_draw_cubic_to_func_t  cubic_to)
 {
   if (unlikely (hb_object_is_immutable (funcs))) return;
   funcs->cubic_to = cubic_to;
 }

 /**
  * hb_draw_funcs_set_close_path_func:
  * @funcs: draw functions object
  * @close_path: close-path callback
  *
  * Sets close-path callback to the draw functions object.
  *
  * Since: EXPERIMENTAL
  **/
 void
 hb_draw_funcs_set_close_path_func (hb_draw_funcs_t           *funcs,
 				   hb_draw_close_path_func_t  close_path)
 {
   if (unlikely (hb_object_is_immutable (funcs))) return;
   funcs->close_path = close_path;
 }

 static void
 _move_to_nil (hb_position_t to_x HB_UNUSED, hb_position_t to_y HB_UNUSED, void *user_data HB_UNUSED) {}

 static void
 _line_to_nil (hb_position_t to_x HB_UNUSED, hb_position_t to_y HB_UNUSED, void *user_data HB_UNUSED) {}

 static void
 _quadratic_to_nil (hb_position_t control_x HB_UNUSED, hb_position_t control_y HB_UNUSED,
 		   hb_position_t to_x HB_UNUSED, hb_position_t to_y HB_UNUSED,
 		   void *user_data HB_UNUSED) {}

 static void
 _cubic_to_nil (hb_position_t control1_x HB_UNUSED, hb_position_t control1_y HB_UNUSED,
 	       hb_position_t control2_x HB_UNUSED, hb_position_t control2_y HB_UNUSED,
 	       hb_position_t to_x HB_UNUSED, hb_position_t to_y HB_UNUSED,
 	       void *user_data HB_UNUSED) {}

 static void
 _close_path_nil (void *user_data HB_UNUSED) {}

 /**
  * hb_draw_funcs_create:
  *
  * Creates a new draw callbacks object.
  *
  * Since: EXPERIMENTAL
  **/
 hb_draw_funcs_t *
 hb_draw_funcs_create ()
 {
   hb_draw_funcs_t *funcs;
   if (unlikely (!(funcs = hb_object_create<hb_draw_funcs_t> ())))
     return const_cast<hb_draw_funcs_t *> (&Null (hb_draw_funcs_t));

   funcs->move_to = (hb_draw_move_to_func_t) _move_to_nil;
   funcs->line_to = (hb_draw_line_to_func_t) _line_to_nil;
   funcs->quadratic_to = (hb_draw_quadratic_to_func_t) _quadratic_to_nil;
   funcs->is_quadratic_to_set = false;
   funcs->cubic_to = (hb_draw_cubic_to_func_t) _cubic_to_nil;
   funcs->close_path = (hb_draw_close_path_func_t) _close_path_nil;
   return funcs;
 }

 /**
  * hb_draw_funcs_reference:
  * @funcs: draw functions
  *
  * Add to callbacks object refcount.
  *
  * Returns: The same object.
  * Since: EXPERIMENTAL
  **/
 hb_draw_funcs_t *
 hb_draw_funcs_reference (hb_draw_funcs_t *funcs)
 {
   return hb_object_reference (funcs);
 }

 /**
  * hb_draw_funcs_destroy:
  * @funcs: draw functions
  *
  * Decreases refcount of callbacks object and deletes the object if it reaches
  * to zero.
  *
  * Since: EXPERIMENTAL
  **/
 void
 hb_draw_funcs_destroy (hb_draw_funcs_t *funcs)
 {
   if (!hb_object_destroy (funcs)) return;

   hb_free (funcs);
 }

 /**
  * hb_draw_funcs_make_immutable:
  * @funcs: draw functions
  *
  * Makes funcs object immutable.
  *
  * Since: EXPERIMENTAL
  **/
 void
 hb_draw_funcs_make_immutable (hb_draw_funcs_t *funcs)
 {
   if (hb_object_is_immutable (funcs))
     return;

   hb_object_make_immutable (funcs);
 }

 /**
  * hb_draw_funcs_is_immutable:
  * @funcs: draw functions
  *
  * Checks whether funcs is immutable.
  *
  * Returns: If is immutable.
  * Since: EXPERIMENTAL
  **/
 hb_bool_t
 hb_draw_funcs_is_immutable (hb_draw_funcs_t *funcs)
 {
   return hb_object_is_immutable (funcs);
 }

 /**
  * hb_font_draw_glyph:
  * @font: a font object
  * @glyph: a glyph id
  * @funcs: draw callbacks object
  * @user_data: parameter you like be passed to the callbacks when are called
  *
  * Draw a glyph.
  *
  * Returns: Whether the font had the glyph and the operation completed successfully.
  * Since: EXPERIMENTAL
  **/
 hb_bool_t
 hb_font_draw_glyph (hb_font_t *font, hb_codepoint_t glyph,
 		    const hb_draw_funcs_t *funcs,
 		    void *user_data)
 {
   if (unlikely (funcs == &Null (hb_draw_funcs_t) ||
 		glyph >= font->face->get_num_glyphs ()))
     return false;

   draw_helper_t draw_helper (funcs, user_data);
   if (font->face->table.glyf->get_path (font, glyph, draw_helper)) return true;
 #ifndef HB_NO_CFF
   if (font->face->table.cff1->get_path (font, glyph, draw_helper)) return true;
   if (font->face->table.cff2->get_path (font, glyph, draw_helper)) return true;
 #endif

   return false;
 }

 #endif
 #endif
	/*
	* Copyright © 2019-2020 Ebrahim Byagowi
	*
	* 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.
	*/

	#include "hb.hh"

	#ifndef HB_NO_DRAW
	#ifdef HB_EXPERIMENTAL_API

	#include "hb-draw.hh"
	#include "hb-ot.h"
	#include "hb-ot-glyf-table.hh"
	#include "hb-ot-cff1-table.hh"
	#include "hb-ot-cff2-table.hh"

	/**
	* hb_draw_funcs_set_move_to_func:
	* @funcs: draw functions object
	* @move_to: move-to callback
	*
	* Sets move-to callback to the draw functions object.
	*
	* Since: EXPERIMENTAL
	**/
	void
	hb_draw_funcs_set_move_to_func (hb_draw_funcs_t *funcs,
	hb_draw_move_to_func_t move_to)
	{
	if (unlikely (hb_object_is_immutable (funcs))) return;
	funcs->move_to = move_to;
	}

	/**
	* hb_draw_funcs_set_line_to_func:
	* @funcs: draw functions object
	* @line_to: line-to callback
	*
	* Sets line-to callback to the draw functions object.
	*
	* Since: EXPERIMENTAL
	**/
	void
	hb_draw_funcs_set_line_to_func (hb_draw_funcs_t *funcs,
	hb_draw_line_to_func_t line_to)
	{
	if (unlikely (hb_object_is_immutable (funcs))) return;
	funcs->line_to = line_to;
	}

	/**
	* hb_draw_funcs_set_quadratic_to_func:
	* @funcs: draw functions object
	* @move_to: quadratic-to callback
	*
	* Sets quadratic-to callback to the draw functions object.
	*
	* Since: EXPERIMENTAL
	**/
	void
	hb_draw_funcs_set_quadratic_to_func (hb_draw_funcs_t *funcs,
	hb_draw_quadratic_to_func_t quadratic_to)
	{
	if (unlikely (hb_object_is_immutable (funcs))) return;
	funcs->quadratic_to = quadratic_to;
	funcs->is_quadratic_to_set = true;
	}

	/**
	* hb_draw_funcs_set_cubic_to_func:
	* @funcs: draw functions
	* @cubic_to: cubic-to callback
	*
	* Sets cubic-to callback to the draw functions object.
	*
	* Since: EXPERIMENTAL
	**/
	void
	hb_draw_funcs_set_cubic_to_func (hb_draw_funcs_t *funcs,
	hb_draw_cubic_to_func_t cubic_to)
	{
	if (unlikely (hb_object_is_immutable (funcs))) return;
	funcs->cubic_to = cubic_to;
	}

	/**
	* hb_draw_funcs_set_close_path_func:
	* @funcs: draw functions object
	* @close_path: close-path callback
	*
	* Sets close-path callback to the draw functions object.
	*
	* Since: EXPERIMENTAL
	**/
	void
	hb_draw_funcs_set_close_path_func (hb_draw_funcs_t *funcs,
	hb_draw_close_path_func_t close_path)
	{
	if (unlikely (hb_object_is_immutable (funcs))) return;
	funcs->close_path = close_path;
	}

	static void
	_move_to_nil (hb_position_t to_x HB_UNUSED, hb_position_t to_y HB_UNUSED, void *user_data HB_UNUSED) {}

	static void
	_line_to_nil (hb_position_t to_x HB_UNUSED, hb_position_t to_y HB_UNUSED, void *user_data HB_UNUSED) {}

	static void
	_quadratic_to_nil (hb_position_t control_x HB_UNUSED, hb_position_t control_y HB_UNUSED,
	hb_position_t to_x HB_UNUSED, hb_position_t to_y HB_UNUSED,
	void *user_data HB_UNUSED) {}

	static void
	_cubic_to_nil (hb_position_t control1_x HB_UNUSED, hb_position_t control1_y HB_UNUSED,
	hb_position_t control2_x HB_UNUSED, hb_position_t control2_y HB_UNUSED,
	hb_position_t to_x HB_UNUSED, hb_position_t to_y HB_UNUSED,
	void *user_data HB_UNUSED) {}

	static void
	_close_path_nil (void *user_data HB_UNUSED) {}

	/**
	* hb_draw_funcs_create:
	*
	* Creates a new draw callbacks object.
	*
	* Since: EXPERIMENTAL
	**/
	hb_draw_funcs_t *
	hb_draw_funcs_create ()
	{
	hb_draw_funcs_t *funcs;
	if (unlikely (!(funcs = hb_object_create<hb_draw_funcs_t> ())))
	return const_cast<hb_draw_funcs_t *> (&Null (hb_draw_funcs_t));

	funcs->move_to = (hb_draw_move_to_func_t) _move_to_nil;
	funcs->line_to = (hb_draw_line_to_func_t) _line_to_nil;
	funcs->quadratic_to = (hb_draw_quadratic_to_func_t) _quadratic_to_nil;
	funcs->is_quadratic_to_set = false;
	funcs->cubic_to = (hb_draw_cubic_to_func_t) _cubic_to_nil;
	funcs->close_path = (hb_draw_close_path_func_t) _close_path_nil;
	return funcs;
	}

	/**
	* hb_draw_funcs_reference:
	* @funcs: draw functions
	*
	* Add to callbacks object refcount.
	*
	* Returns: The same object.
	* Since: EXPERIMENTAL
	**/
	hb_draw_funcs_t *
	hb_draw_funcs_reference (hb_draw_funcs_t *funcs)
	{
	return hb_object_reference (funcs);
	}

	/**
	* hb_draw_funcs_destroy:
	* @funcs: draw functions
	*
	* Decreases refcount of callbacks object and deletes the object if it reaches
	* to zero.
	*
	* Since: EXPERIMENTAL
	**/
	void
	hb_draw_funcs_destroy (hb_draw_funcs_t *funcs)
	{
	if (!hb_object_destroy (funcs)) return;

	hb_free (funcs);
	}

	/**
	* hb_draw_funcs_make_immutable:
	* @funcs: draw functions
	*
	* Makes funcs object immutable.
	*
	* Since: EXPERIMENTAL
	**/
	void
	hb_draw_funcs_make_immutable (hb_draw_funcs_t *funcs)
	{
	if (hb_object_is_immutable (funcs))
	return;

	hb_object_make_immutable (funcs);
	}

	/**
	* hb_draw_funcs_is_immutable:
	* @funcs: draw functions
	*
	* Checks whether funcs is immutable.
	*
	* Returns: If is immutable.
	* Since: EXPERIMENTAL
	**/
	hb_bool_t
	hb_draw_funcs_is_immutable (hb_draw_funcs_t *funcs)
	{
	return hb_object_is_immutable (funcs);
	}

	/**
	* hb_font_draw_glyph:
	* @font: a font object
	* @glyph: a glyph id
	* @funcs: draw callbacks object
	* @user_data: parameter you like be passed to the callbacks when are called
	*
	* Draw a glyph.
	*
	* Returns: Whether the font had the glyph and the operation completed successfully.
	* Since: EXPERIMENTAL
	**/
	hb_bool_t
	hb_font_draw_glyph (hb_font_t *font, hb_codepoint_t glyph,
	const hb_draw_funcs_t *funcs,
	void *user_data)
	{
	if (unlikely (funcs == &Null (hb_draw_funcs_t) \|\|
	glyph >= font->face->get_num_glyphs ()))
	return false;

	draw_helper_t draw_helper (funcs, user_data);
	if (font->face->table.glyf->get_path (font, glyph, draw_helper)) return true;
	#ifndef HB_NO_CFF
	if (font->face->table.cff1->get_path (font, glyph, draw_helper)) return true;
	if (font->face->table.cff2->get_path (font, glyph, draw_helper)) return true;
	#endif

	return false;
	}

	#endif
	#endif