chromium/third_party/harfbuzz-ng/src/src/hb-ot-shaper-arabic.cc

/*
 * Copyright © 2010,2012  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
 */

#include "hb.hh"

#ifndef HB_NO_OT_SHAPE

#include "hb-ot-shaper-arabic.hh"
#include "hb-ot-shape.hh"


/* buffer var allocations */
#define arabic_shaping_action() …

#define HB_BUFFER_SCRATCH_FLAG_ARABIC_HAS_STCH …

/* See:
 * https://github.com/harfbuzz/harfbuzz/commit/6e6f82b6f3dde0fc6c3c7d991d9ec6cfff57823d#commitcomment-14248516 */
#define HB_ARABIC_GENERAL_CATEGORY_IS_WORD(gen_cat) …


/*
 * Joining types:
 */

/*
 * Bits used in the joining tables
 */
enum hb_arabic_joining_type_t { … };

#include "hb-ot-shaper-arabic-table.hh"

static unsigned int get_joining_type (hb_codepoint_t u, hb_unicode_general_category_t gen_cat)
{ … }

#define FEATURE_IS_SYRIAC(tag) …

static const hb_tag_t arabic_features[] = …;


/* Same order as the feature array */
enum arabic_action_t { … };

static const struct arabic_state_table_entry { … } arabic_state_table[][NUM_STATE_MACHINE_COLS] = …;


static bool
arabic_fallback_shape (const hb_ot_shape_plan_t *plan,
		       hb_font_t *font,
		       hb_buffer_t *buffer);

static bool
record_stch (const hb_ot_shape_plan_t *plan,
	     hb_font_t *font,
	     hb_buffer_t *buffer);

static bool
deallocate_buffer_var (const hb_ot_shape_plan_t *plan,
		       hb_font_t *font,
		       hb_buffer_t *buffer)
{ … }

static void
collect_features_arabic (hb_ot_shape_planner_t *plan)
{ … }

#include "hb-ot-shaper-arabic-fallback.hh"

struct arabic_shape_plan_t
{ … };

void *
data_create_arabic (const hb_ot_shape_plan_t *plan)
{ … }

void
data_destroy_arabic (void *data)
{ … }

static void
arabic_joining (hb_buffer_t *buffer)
{ … }

static void
mongolian_variation_selectors (hb_buffer_t *buffer)
{ … }

void
setup_masks_arabic_plan (const arabic_shape_plan_t *arabic_plan,
			 hb_buffer_t               *buffer,
			 hb_script_t                script)
{ … }

static void
setup_masks_arabic (const hb_ot_shape_plan_t *plan,
		    hb_buffer_t              *buffer,
		    hb_font_t                *font HB_UNUSED)
{ … }

static bool
arabic_fallback_shape (const hb_ot_shape_plan_t *plan,
		       hb_font_t *font,
		       hb_buffer_t *buffer)
{ … }

/*
 * Stretch feature: "stch".
 * See example here:
 * https://docs.microsoft.com/en-us/typography/script-development/syriac
 * We implement this in a generic way, such that the Arabic subtending
 * marks can use it as well.
 */

static bool
record_stch (const hb_ot_shape_plan_t *plan,
	     hb_font_t *font HB_UNUSED,
	     hb_buffer_t *buffer)
{ … }

static void
apply_stch (const hb_ot_shape_plan_t *plan HB_UNUSED,
	    hb_buffer_t              *buffer,
	    hb_font_t                *font)
{ … }


static void
postprocess_glyphs_arabic (const hb_ot_shape_plan_t *plan,
			   hb_buffer_t              *buffer,
			   hb_font_t                *font)
{ … }

/* https://www.unicode.org/reports/tr53/ */

static hb_codepoint_t
modifier_combining_marks[] = …;

static inline bool
info_is_mcm (const hb_glyph_info_t &info)
{ … }

static void
reorder_marks_arabic (const hb_ot_shape_plan_t *plan HB_UNUSED,
		      hb_buffer_t              *buffer,
		      unsigned int              start,
		      unsigned int              end)
{ … }

const hb_ot_shaper_t _hb_ot_shaper_arabic = …;


#endif