diff options
Diffstat (limited to 'src/3rdparty/harfbuzz-ng/src/hb-ot-layout-private.hh')
| -rw-r--r-- | src/3rdparty/harfbuzz-ng/src/hb-ot-layout-private.hh | 296 |
1 files changed, 296 insertions, 0 deletions
diff --git a/src/3rdparty/harfbuzz-ng/src/hb-ot-layout-private.hh b/src/3rdparty/harfbuzz-ng/src/hb-ot-layout-private.hh new file mode 100644 index 0000000000..c5ba8b4b4d --- /dev/null +++ b/src/3rdparty/harfbuzz-ng/src/hb-ot-layout-private.hh @@ -0,0 +1,296 @@ +/* + * Copyright © 2007,2008,2009 Red Hat, Inc. + * Copyright © 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. + * + * Red Hat Author(s): Behdad Esfahbod + * Google Author(s): Behdad Esfahbod + */ + +#ifndef HB_OT_LAYOUT_PRIVATE_HH +#define HB_OT_LAYOUT_PRIVATE_HH + +#include "hb-private.hh" + +#include "hb-ot-layout.h" + +#include "hb-font-private.hh" +#include "hb-buffer-private.hh" +#include "hb-set-private.hh" + + +/* buffer var allocations, used during the GSUB/GPOS processing */ +#define glyph_props() var1.u16[0] /* GDEF glyph properties */ +#define syllable() var1.u8[2] /* GSUB/GPOS shaping boundaries */ +#define lig_props() var1.u8[3] /* GSUB/GPOS ligature tracking */ + +/* buffer var allocations, used during the entire shaping process */ +#define unicode_props0() var2.u8[0] +#define unicode_props1() var2.u8[1] + + +inline void +_hb_glyph_info_set_unicode_props (hb_glyph_info_t *info, hb_unicode_funcs_t *unicode) +{ + info->unicode_props0() = ((unsigned int) unicode->general_category (info->codepoint)) | + (unicode->is_default_ignorable (info->codepoint) ? 0x80 : 0) | + (info->codepoint == 0x200C ? 0x40 : 0) | + (info->codepoint == 0x200D ? 0x20 : 0); + info->unicode_props1() = unicode->modified_combining_class (info->codepoint); +} + +inline void +_hb_glyph_info_set_general_category (hb_glyph_info_t *info, hb_unicode_general_category_t gen_cat) +{ + info->unicode_props0() = (unsigned int) gen_cat | ((info->unicode_props0()) & ~0x1F); +} + +inline hb_unicode_general_category_t +_hb_glyph_info_get_general_category (const hb_glyph_info_t *info) +{ + return (hb_unicode_general_category_t) (info->unicode_props0() & 0x1F); +} + +inline void +_hb_glyph_info_set_modified_combining_class (hb_glyph_info_t *info, unsigned int modified_class) +{ + info->unicode_props1() = modified_class; +} + +inline unsigned int +_hb_glyph_info_get_modified_combining_class (const hb_glyph_info_t *info) +{ + return info->unicode_props1(); +} + +inline hb_bool_t +_hb_glyph_info_is_default_ignorable (const hb_glyph_info_t *info) +{ + return !!(info->unicode_props0() & 0x80); +} + +inline hb_bool_t +_hb_glyph_info_is_zwnj (const hb_glyph_info_t *info) +{ + return !!(info->unicode_props0() & 0x40); +} + +inline hb_bool_t +_hb_glyph_info_is_zwj (const hb_glyph_info_t *info) +{ + return !!(info->unicode_props0() & 0x20); +} + + +#define hb_ot_layout_from_face(face) ((hb_ot_layout_t *) face->shaper_data.ot) + +/* + * GDEF + */ + +typedef enum { + HB_OT_LAYOUT_GLYPH_PROPS_UNCLASSIFIED = 1 << HB_OT_LAYOUT_GLYPH_CLASS_UNCLASSIFIED, + HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH = 1 << HB_OT_LAYOUT_GLYPH_CLASS_BASE_GLYPH, + HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE = 1 << HB_OT_LAYOUT_GLYPH_CLASS_LIGATURE, + HB_OT_LAYOUT_GLYPH_PROPS_MARK = 1 << HB_OT_LAYOUT_GLYPH_CLASS_MARK, + HB_OT_LAYOUT_GLYPH_PROPS_COMPONENT = 1 << HB_OT_LAYOUT_GLYPH_CLASS_COMPONENT +} hb_ot_layout_glyph_class_mask_t; + + + +/* + * GSUB/GPOS + */ + +/* lig_id / lig_comp + * + * When a ligature is formed: + * + * - The ligature glyph and any marks in between all the same newly allocated + * lig_id, + * - The ligature glyph will get lig_num_comps set to the number of components + * - The marks get lig_comp > 0, reflecting which component of the ligature + * they were applied to. + * - This is used in GPOS to attach marks to the right component of a ligature + * in MarkLigPos. + * + * When a multiple-substitution is done: + * + * - All resulting glyphs will have lig_id = 0, + * - The resulting glyphs will have lig_comp = 0, 1, 2, ... respectively. + * - This is used in GPOS to attach marks to the first component of a + * multiple substitution in MarkBasePos. + * + * The numbers are also used in GPOS to do mark-to-mark positioning only + * to marks that belong to the same component of a ligature in MarkMarPos. + */ +#define IS_LIG_BASE 0x10 +static inline void +set_lig_props_for_ligature (hb_glyph_info_t &info, unsigned int lig_id, unsigned int lig_num_comps) +{ + info.lig_props() = (lig_id << 5) | IS_LIG_BASE | (lig_num_comps & 0x0F); +} +static inline void +set_lig_props_for_mark (hb_glyph_info_t &info, unsigned int lig_id, unsigned int lig_comp) +{ + info.lig_props() = (lig_id << 5) | (lig_comp & 0x0F); +} +static inline void +set_lig_props_for_component (hb_glyph_info_t &info, unsigned int comp) +{ + set_lig_props_for_mark (info, 0, comp); +} + +static inline unsigned int +get_lig_id (const hb_glyph_info_t &info) +{ + return info.lig_props() >> 5; +} +static inline bool +is_a_ligature (const hb_glyph_info_t &info) +{ + return !!(info.lig_props() & IS_LIG_BASE); +} +static inline unsigned int +get_lig_comp (const hb_glyph_info_t &info) +{ + if (is_a_ligature (info)) + return 0; + else + return info.lig_props() & 0x0F; +} +static inline unsigned int +get_lig_num_comps (const hb_glyph_info_t &info) +{ + if ((info.glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE) && is_a_ligature (info)) + return info.lig_props() & 0x0F; + else + return 1; +} + +static inline uint8_t allocate_lig_id (hb_buffer_t *buffer) { + uint8_t lig_id = buffer->next_serial () & 0x07; + if (unlikely (!lig_id)) + lig_id = allocate_lig_id (buffer); /* in case of overflow */ + return lig_id; +} + + +HB_INTERNAL hb_bool_t +hb_ot_layout_lookup_would_substitute_fast (hb_face_t *face, + unsigned int lookup_index, + const hb_codepoint_t *glyphs, + unsigned int glyphs_length, + hb_bool_t zero_context); + + +/* Should be called before all the substitute_lookup's are done. */ +HB_INTERNAL void +hb_ot_layout_substitute_start (hb_font_t *font, + hb_buffer_t *buffer); + + +struct hb_ot_layout_lookup_accelerator_t; + +namespace OT { + struct hb_apply_context_t; + struct SubstLookup; +} + +HB_INTERNAL void +hb_ot_layout_substitute_lookup (OT::hb_apply_context_t *c, + const OT::SubstLookup &lookup, + const hb_ot_layout_lookup_accelerator_t &accel); + + +/* Should be called after all the substitute_lookup's are done */ +HB_INTERNAL void +hb_ot_layout_substitute_finish (hb_font_t *font, + hb_buffer_t *buffer); + + +/* Should be called before all the position_lookup's are done. Resets positions to zero. */ +HB_INTERNAL void +hb_ot_layout_position_start (hb_font_t *font, + hb_buffer_t *buffer); + +/* Should be called after all the position_lookup's are done */ +HB_INTERNAL void +hb_ot_layout_position_finish (hb_font_t *font, + hb_buffer_t *buffer); + + + +/* + * hb_ot_layout_t + */ + +namespace OT { + struct GDEF; + struct GSUB; + struct GPOS; +} + +struct hb_ot_layout_lookup_accelerator_t +{ + template <typename TLookup> + inline void init (const TLookup &lookup) + { + digest.init (); + lookup.add_coverage (&digest); + } + + template <typename TLookup> + inline void fini (const TLookup &lookup) + { + } + + hb_set_digest_t digest; +}; + +struct hb_ot_layout_t +{ + hb_blob_t *gdef_blob; + hb_blob_t *gsub_blob; + hb_blob_t *gpos_blob; + + const struct OT::GDEF *gdef; + const struct OT::GSUB *gsub; + const struct OT::GPOS *gpos; + + unsigned int gsub_lookup_count; + unsigned int gpos_lookup_count; + + hb_ot_layout_lookup_accelerator_t *gsub_accels; + hb_ot_layout_lookup_accelerator_t *gpos_accels; +}; + + +HB_INTERNAL hb_ot_layout_t * +_hb_ot_layout_create (hb_face_t *face); + +HB_INTERNAL void +_hb_ot_layout_destroy (hb_ot_layout_t *layout); + + + +#endif /* HB_OT_LAYOUT_PRIVATE_HH */ |