2008-01-24 09:11:09 +01:00
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/*
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2011-04-21 23:14:28 +02:00
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* Copyright © 2007,2008,2009 Red Hat, Inc.
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2012-07-30 08:38:39 +02:00
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* Copyright © 2012 Google, Inc.
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2008-01-24 09:11:09 +01:00
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*
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2010-04-22 06:11:43 +02:00
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* This is part of HarfBuzz, a text shaping library.
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2008-01-24 09:11:09 +01:00
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Red Hat Author(s): Behdad Esfahbod
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2012-07-30 08:38:39 +02:00
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* Google Author(s): Behdad Esfahbod
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2008-01-24 09:11:09 +01:00
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*/
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2010-06-09 12:32:56 +02:00
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#ifndef HB_OT_LAYOUT_PRIVATE_HH
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#define HB_OT_LAYOUT_PRIVATE_HH
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2008-01-24 09:11:09 +01:00
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2011-04-21 00:50:27 +02:00
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#include "hb-private.hh"
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2009-08-02 21:20:22 +02:00
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2008-01-24 09:11:09 +01:00
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#include "hb-ot-layout.h"
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2009-08-02 21:20:22 +02:00
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2011-04-21 00:50:27 +02:00
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#include "hb-font-private.hh"
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2010-05-13 00:23:21 +02:00
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#include "hb-buffer-private.hh"
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2012-08-02 03:46:36 +02:00
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#include "hb-set-private.hh"
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2008-01-24 09:11:09 +01:00
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2009-08-04 03:40:20 +02:00
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2012-07-30 08:38:39 +02:00
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/* buffer var allocations, used during the GSUB/GPOS processing */
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2012-08-10 03:48:55 +02:00
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#define glyph_props() var1.u16[0] /* GDEF glyph properties */
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#define syllable() var1.u8[2] /* GSUB/GPOS shaping boundaries */
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#define lig_props() var1.u8[3] /* GSUB/GPOS ligature tracking */
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2012-07-30 08:38:39 +02:00
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2012-07-27 08:12:28 +02:00
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#define hb_ot_layout_from_face(face) ((hb_ot_layout_t *) face->shaper_data.ot)
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2010-07-23 21:11:18 +02:00
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2011-05-03 06:35:53 +02:00
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/*
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* GDEF
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*/
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2012-11-16 22:34:29 +01:00
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typedef enum {
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HB_OT_LAYOUT_GLYPH_PROPS_UNCLASSIFIED = 0x0001,
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HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH = 0x0002,
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HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE = 0x0004,
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HB_OT_LAYOUT_GLYPH_PROPS_MARK = 0x0008,
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HB_OT_LAYOUT_GLYPH_PROPS_COMPONENT = 0x0010
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} hb_ot_layout_glyph_class_mask_t;
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2008-01-24 09:54:09 +01:00
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2011-05-03 06:35:53 +02:00
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2012-07-24 02:14:13 +02:00
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/*
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* GSUB/GPOS
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*/
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2012-07-26 00:37:51 +02:00
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/* lig_id / lig_comp
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*
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* When a ligature is formed:
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*
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2012-07-29 03:05:25 +02:00
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* - The ligature glyph and any marks in between all the same newly allocated
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* lig_id,
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2012-07-30 06:42:07 +02:00
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* - The ligature glyph will get lig_num_comps set to the number of components
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2012-07-26 00:37:51 +02:00
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* - The marks get lig_comp > 0, reflecting which component of the ligature
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* they were applied to.
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* - This is used in GPOS to attach marks to the right component of a ligature
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* in MarkLigPos.
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*
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* When a multiple-substitution is done:
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*
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* - All resulting glyphs will have lig_id = 0,
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* - The resulting glyphs will have lig_comp = 0, 1, 2, ... respectively.
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2012-07-29 03:05:25 +02:00
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* - This is used in GPOS to attach marks to the first component of a
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2012-07-26 00:37:51 +02:00
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* multiple substitution in MarkBasePos.
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*
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* The numbers are also used in GPOS to do mark-to-mark positioning only
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* to marks that belong to the same component of a ligature in MarkMarPos.
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*/
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2012-07-30 06:42:07 +02:00
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#define IS_LIG_BASE 0x10
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2012-07-24 02:14:13 +02:00
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static inline void
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2012-07-30 04:02:24 +02:00
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set_lig_props_for_ligature (hb_glyph_info_t &info, unsigned int lig_id, unsigned int lig_num_comps)
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{
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2012-07-30 06:42:07 +02:00
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info.lig_props() = (lig_id << 5) | IS_LIG_BASE | (lig_num_comps & 0x0F);
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2012-07-30 04:02:24 +02:00
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}
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static inline void
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set_lig_props_for_mark (hb_glyph_info_t &info, unsigned int lig_id, unsigned int lig_comp)
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{
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info.lig_props() = (lig_id << 5) | (lig_comp & 0x0F);
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}
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static inline void
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set_lig_props_for_component (hb_glyph_info_t &info, unsigned int comp)
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{
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set_lig_props_for_mark (info, 0, comp);
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}
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2012-07-24 02:14:13 +02:00
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static inline unsigned int
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get_lig_id (const hb_glyph_info_t &info)
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{
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2012-07-30 04:02:24 +02:00
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return info.lig_props() >> 5;
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2012-07-24 02:14:13 +02:00
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}
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2012-07-30 06:42:07 +02:00
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static inline bool
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is_a_ligature (const hb_glyph_info_t &info)
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{
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return !!(info.lig_props() & IS_LIG_BASE);
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}
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2012-07-24 02:14:13 +02:00
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static inline unsigned int
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get_lig_comp (const hb_glyph_info_t &info)
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{
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2012-07-30 06:42:07 +02:00
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if (is_a_ligature (info))
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2012-07-30 04:02:24 +02:00
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return 0;
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else
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return info.lig_props() & 0x0F;
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}
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static inline unsigned int
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get_lig_num_comps (const hb_glyph_info_t &info)
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{
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2012-11-16 22:34:29 +01:00
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if ((info.glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE) && is_a_ligature (info))
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2012-07-30 04:02:24 +02:00
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return info.lig_props() & 0x0F;
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else
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return 1;
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2012-07-24 02:14:13 +02:00
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}
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static inline uint8_t allocate_lig_id (hb_buffer_t *buffer) {
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2012-07-30 04:02:24 +02:00
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uint8_t lig_id = buffer->next_serial () & 0x07;
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2012-07-24 02:14:13 +02:00
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if (unlikely (!lig_id))
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lig_id = allocate_lig_id (buffer); /* in case of overflow */
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return lig_id;
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}
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2012-07-30 08:38:39 +02:00
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HB_INTERNAL hb_bool_t
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2012-11-15 23:57:31 +01:00
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hb_ot_layout_lookup_would_substitute_fast (hb_face_t *face,
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2012-08-23 22:22:28 +02:00
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unsigned int lookup_index,
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2012-07-30 08:38:39 +02:00
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const hb_codepoint_t *glyphs,
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unsigned int glyphs_length,
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2012-08-23 22:22:28 +02:00
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hb_bool_t zero_context);
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2012-07-30 08:38:39 +02:00
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2012-08-02 14:11:14 +02:00
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/* Should be called before all the substitute_lookup's are done. */
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HB_INTERNAL void
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2012-08-02 14:36:40 +02:00
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hb_ot_layout_substitute_start (hb_font_t *font,
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2012-08-02 14:11:14 +02:00
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hb_buffer_t *buffer);
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2012-07-30 08:38:39 +02:00
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HB_INTERNAL hb_bool_t
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2012-08-02 14:36:40 +02:00
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hb_ot_layout_substitute_lookup (hb_font_t *font,
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2012-08-02 14:11:14 +02:00
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hb_buffer_t *buffer,
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unsigned int lookup_index,
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hb_mask_t mask);
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/* Should be called after all the substitute_lookup's are done */
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HB_INTERNAL void
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2012-08-02 14:36:40 +02:00
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hb_ot_layout_substitute_finish (hb_font_t *font,
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2012-08-02 14:11:14 +02:00
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hb_buffer_t *buffer);
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/* Should be called before all the position_lookup's are done. Resets positions to zero. */
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HB_INTERNAL void
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hb_ot_layout_position_start (hb_font_t *font,
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hb_buffer_t *buffer);
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2012-07-30 08:38:39 +02:00
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HB_INTERNAL hb_bool_t
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2012-08-02 14:11:14 +02:00
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hb_ot_layout_position_lookup (hb_font_t *font,
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hb_buffer_t *buffer,
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unsigned int lookup_index,
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hb_mask_t mask);
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/* Should be called after all the position_lookup's are done */
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HB_INTERNAL void
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hb_ot_layout_position_finish (hb_font_t *font,
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Adjust mark advance-width zeroing logic for Myanmar
Before, we were zeroing advance width of attached marks for
non-Indic scripts, and not doing it for Indic.
We have now three different behaviors, which seem to better
reflect what Uniscribe is doing:
- For Indic, no explicit zeroing happens whatsoever, which
is the same as before,
- For Myanmar, zero advance width of glyphs marked as marks
*in GDEF*, and do that *before* applying GPOS. This seems
to be what the new Win8 Myanmar shaper does,
- For everything else, zero advance width of glyphs that are
from General_Category=Mn Unicode characters, and do so
before applying GPOS. This seems to be what Uniscribe does
for Latin at least.
With these changes, positioning of all tests matches for Myanmar,
except for the glitch in Uniscribe not applying 'mark'. See preivous
commit.
2013-02-12 15:44:57 +01:00
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hb_buffer_t *buffer);
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2012-08-02 14:11:14 +02:00
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2012-07-30 08:38:39 +02:00
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2009-08-02 23:41:36 +02:00
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/*
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* hb_ot_layout_t
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*/
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2012-08-28 23:57:49 +02:00
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namespace OT {
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struct GDEF;
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struct GSUB;
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struct GPOS;
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}
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2010-05-19 21:45:06 +02:00
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struct hb_ot_layout_t
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2009-05-20 05:58:54 +02:00
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{
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2009-08-04 04:01:47 +02:00
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hb_blob_t *gdef_blob;
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hb_blob_t *gsub_blob;
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hb_blob_t *gpos_blob;
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2012-08-28 23:57:49 +02:00
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const struct OT::GDEF *gdef;
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const struct OT::GSUB *gsub;
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const struct OT::GPOS *gpos;
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2012-08-02 03:46:36 +02:00
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2012-08-02 10:00:31 +02:00
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unsigned int gsub_lookup_count;
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unsigned int gpos_lookup_count;
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2012-08-02 03:46:36 +02:00
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hb_set_digest_t *gsub_digests;
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hb_set_digest_t *gpos_digests;
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2009-08-02 23:41:36 +02:00
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};
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2009-05-18 23:09:33 +02:00
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2009-05-16 00:54:53 +02:00
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2010-05-19 21:45:06 +02:00
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HB_INTERNAL hb_ot_layout_t *
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2011-05-03 06:35:53 +02:00
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_hb_ot_layout_create (hb_face_t *face);
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2009-08-04 03:40:20 +02:00
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2010-05-13 05:22:55 +02:00
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HB_INTERNAL void
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2011-05-03 06:35:53 +02:00
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_hb_ot_layout_destroy (hb_ot_layout_t *layout);
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2009-05-26 23:31:56 +02:00
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2010-07-23 21:11:18 +02:00
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2008-01-24 09:11:09 +01:00
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2010-06-09 12:32:56 +02:00
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#endif /* HB_OT_LAYOUT_PRIVATE_HH */
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