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| -rw-r--r-- | gfx/harfbuzz/src/hb-subset-plan.hh | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/hb-subset-plan.hh b/gfx/harfbuzz/src/hb-subset-plan.hh new file mode 100644 index 0000000000..e9f603dd1d --- /dev/null +++ b/gfx/harfbuzz/src/hb-subset-plan.hh @@ -0,0 +1,194 @@ +/* + * Copyright © 2018 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): Garret Rieger, Roderick Sheeter + */ + +#ifndef HB_SUBSET_PLAN_HH +#define HB_SUBSET_PLAN_HH + +#include "hb.hh" + +#include "hb-subset.h" +#include "hb-subset-input.hh" + +#include "hb-map.hh" +#include "hb-set.hh" + +struct hb_subset_plan_t +{ + hb_object_header_t header; + + bool successful : 1; + bool drop_hints : 1; + bool desubroutinize : 1; + bool retain_gids : 1; + bool name_legacy : 1; + + // For each cp that we'd like to retain maps to the corresponding gid. + hb_set_t *unicodes; + + // name_ids we would like to retain + hb_set_t *name_ids; + + // name_languages we would like to retain + hb_set_t *name_languages; + + //glyph ids requested to retain + hb_set_t *glyphs_requested; + + // Tables which should be dropped. + hb_set_t *drop_tables; + + // The glyph subset + hb_map_t *codepoint_to_glyph; + + // Old -> New glyph id mapping + hb_map_t *glyph_map; + hb_map_t *reverse_glyph_map; + + // Plan is only good for a specific source/dest so keep them with it + hb_face_t *source; + hb_face_t *dest; + + unsigned int _num_output_glyphs; + hb_set_t *_glyphset; + hb_set_t *_glyphset_gsub; + + //active lookups we'd like to retain + hb_map_t *gsub_lookups; + hb_map_t *gpos_lookups; + + //active features we'd like to retain + hb_map_t *gsub_features; + hb_map_t *gpos_features; + + //The set of layout item variation store delta set indices to be retained + hb_set_t *layout_variation_indices; + //Old -> New layout item variation store delta set index mapping + hb_map_t *layout_variation_idx_map; + + public: + + bool in_error () const { return !successful; } + + bool check_success(bool success) + { + successful = (successful && success); + return successful; + } + + /* + * The set of input glyph ids which will be retained in the subset. + * Does NOT include ids kept due to retain_gids. You probably want to use + * glyph_map/reverse_glyph_map. + */ + inline const hb_set_t * + glyphset () const + { + return _glyphset; + } + + /* + * The set of input glyph ids which will be retained in the subset. + */ + inline const hb_set_t * + glyphset_gsub () const + { + return _glyphset_gsub; + } + + /* + * The total number of output glyphs in the final subset. + */ + inline unsigned int + num_output_glyphs () const + { + return _num_output_glyphs; + } + + /* + * Given an output gid , returns true if that glyph id is an empty + * glyph (ie. it's a gid that we are dropping all data for). + */ + inline bool is_empty_glyph (hb_codepoint_t gid) const + { + return !_glyphset->has (gid); + } + + inline bool new_gid_for_codepoint (hb_codepoint_t codepoint, + hb_codepoint_t *new_gid) const + { + hb_codepoint_t old_gid = codepoint_to_glyph->get (codepoint); + if (old_gid == HB_MAP_VALUE_INVALID) + return false; + + return new_gid_for_old_gid (old_gid, new_gid); + } + + inline bool new_gid_for_old_gid (hb_codepoint_t old_gid, + hb_codepoint_t *new_gid) const + { + hb_codepoint_t gid = glyph_map->get (old_gid); + if (gid == HB_MAP_VALUE_INVALID) + return false; + + *new_gid = gid; + return true; + } + + inline bool old_gid_for_new_gid (hb_codepoint_t new_gid, + hb_codepoint_t *old_gid) const + { + hb_codepoint_t gid = reverse_glyph_map->get (new_gid); + if (gid == HB_MAP_VALUE_INVALID) + return false; + + *old_gid = gid; + return true; + } + + inline bool + add_table (hb_tag_t tag, + hb_blob_t *contents) + { + hb_blob_t *source_blob = source->reference_table (tag); + DEBUG_MSG(SUBSET, nullptr, "add table %c%c%c%c, dest %d bytes, source %d bytes", + HB_UNTAG(tag), + hb_blob_get_length (contents), + hb_blob_get_length (source_blob)); + hb_blob_destroy (source_blob); + return hb_face_builder_add_table (dest, tag, contents); + } +}; + +typedef struct hb_subset_plan_t hb_subset_plan_t; + +HB_INTERNAL hb_subset_plan_t * +hb_subset_plan_create (hb_face_t *face, + hb_subset_input_t *input); + +HB_INTERNAL void +hb_subset_plan_destroy (hb_subset_plan_t *plan); + +#endif /* HB_SUBSET_PLAN_HH */ |