255 lines
7.3 KiB
C++
255 lines
7.3 KiB
C++
/*
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* Copyright © 2018 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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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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* Google Author(s): Garret Rieger, Roderick Sheeter
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*/
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#include "hb-subset-plan.hh"
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#include "hb-map.hh"
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#include "hb-set.hh"
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#include "hb-ot-cmap-table.hh"
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#include "hb-ot-glyf-table.hh"
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#include "hb-ot-cff1-table.hh"
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static void
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_add_gid_and_children (const OT::glyf::accelerator_t &glyf,
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hb_codepoint_t gid,
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hb_set_t *gids_to_retain)
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{
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if (hb_set_has (gids_to_retain, gid))
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// Already visited this gid, ignore.
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return;
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hb_set_add (gids_to_retain, gid);
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OT::glyf::CompositeGlyphHeader::Iterator composite;
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if (glyf.get_composite (gid, &composite))
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{
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do
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{
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_add_gid_and_children (glyf, (hb_codepoint_t) composite.current->glyphIndex, gids_to_retain);
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} while (composite.move_to_next());
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}
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}
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static void
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_add_cff_seac_components (const OT::cff1::accelerator_t &cff,
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hb_codepoint_t gid,
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hb_set_t *gids_to_retain)
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{
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hb_codepoint_t base_gid, accent_gid;
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if (cff.get_seac_components (gid, &base_gid, &accent_gid))
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{
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hb_set_add (gids_to_retain, base_gid);
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hb_set_add (gids_to_retain, accent_gid);
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}
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}
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static void
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_gsub_closure (hb_face_t *face, hb_set_t *gids_to_retain)
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{
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hb_set_t lookup_indices;
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hb_ot_layout_collect_lookups (face,
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HB_OT_TAG_GSUB,
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nullptr,
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nullptr,
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nullptr,
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&lookup_indices);
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hb_ot_layout_lookups_substitute_closure (face,
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&lookup_indices,
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gids_to_retain);
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}
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static void
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_remove_invalid_gids (hb_set_t *glyphs,
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unsigned int num_glyphs)
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{
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hb_codepoint_t gid = HB_SET_VALUE_INVALID;
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while (glyphs->next (&gid))
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{
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if (gid >= num_glyphs)
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glyphs->del (gid);
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}
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}
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static hb_set_t *
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_populate_gids_to_retain (hb_face_t *face,
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const hb_set_t *unicodes,
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const hb_set_t *input_glyphs_to_retain,
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bool close_over_gsub,
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hb_set_t *unicodes_to_retain,
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hb_map_t *codepoint_to_glyph,
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hb_vector_t<hb_codepoint_t> *glyphs)
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{
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OT::cmap::accelerator_t cmap;
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OT::glyf::accelerator_t glyf;
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OT::cff1::accelerator_t cff;
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cmap.init (face);
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glyf.init (face);
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cff.init (face);
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hb_set_t *initial_gids_to_retain = hb_set_create ();
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initial_gids_to_retain->add (0); // Not-def
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hb_set_union (initial_gids_to_retain, input_glyphs_to_retain);
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hb_codepoint_t cp = HB_SET_VALUE_INVALID;
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while (unicodes->next (&cp))
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{
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hb_codepoint_t gid;
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if (!cmap.get_nominal_glyph (cp, &gid))
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{
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DEBUG_MSG(SUBSET, nullptr, "Drop U+%04X; no gid", cp);
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continue;
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}
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unicodes_to_retain->add (cp);
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codepoint_to_glyph->set (cp, gid);
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initial_gids_to_retain->add (gid);
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}
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if (close_over_gsub)
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// Add all glyphs needed for GSUB substitutions.
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_gsub_closure (face, initial_gids_to_retain);
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// Populate a full set of glyphs to retain by adding all referenced
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// composite glyphs.
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hb_codepoint_t gid = HB_SET_VALUE_INVALID;
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hb_set_t *all_gids_to_retain = hb_set_create ();
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while (initial_gids_to_retain->next (&gid))
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{
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_add_gid_and_children (glyf, gid, all_gids_to_retain);
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if (cff.is_valid ())
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_add_cff_seac_components (cff, gid, all_gids_to_retain);
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}
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hb_set_destroy (initial_gids_to_retain);
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_remove_invalid_gids (all_gids_to_retain, face->get_num_glyphs ());
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glyphs->alloc (all_gids_to_retain->get_population ());
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gid = HB_SET_VALUE_INVALID;
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while (all_gids_to_retain->next (&gid))
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glyphs->push (gid);
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cff.fini ();
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glyf.fini ();
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cmap.fini ();
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return all_gids_to_retain;
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}
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static void
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_create_old_gid_to_new_gid_map (const hb_face_t *face,
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bool retain_gids,
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const hb_vector_t<hb_codepoint_t> &glyphs,
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hb_map_t *glyph_map, /* OUT */
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hb_map_t *reverse_glyph_map, /* OUT */
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unsigned int *num_glyphs /* OUT */)
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{
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for (unsigned int i = 0; i < glyphs.length; i++) {
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if (!retain_gids)
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{
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glyph_map->set (glyphs[i], i);
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reverse_glyph_map->set (i, glyphs[i]);
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}
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else
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{
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glyph_map->set (glyphs[i], glyphs[i]);
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reverse_glyph_map->set (glyphs[i], glyphs[i]);
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}
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}
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if (!retain_gids || glyphs.length == 0)
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{
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*num_glyphs = glyphs.length;
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}
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else
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{
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*num_glyphs = face->get_num_glyphs ();
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}
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}
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/**
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* hb_subset_plan_create:
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* Computes a plan for subsetting the supplied face according
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* to a provided input. The plan describes
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* which tables and glyphs should be retained.
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*
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* Return value: New subset plan.
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*
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* Since: 1.7.5
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**/
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hb_subset_plan_t *
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hb_subset_plan_create (hb_face_t *face,
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hb_subset_input_t *input)
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{
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hb_subset_plan_t *plan = hb_object_create<hb_subset_plan_t> ();
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plan->drop_hints = input->drop_hints;
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plan->drop_layout = input->drop_layout;
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plan->desubroutinize = input->desubroutinize;
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plan->unicodes = hb_set_create();
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plan->glyphs_deprecated.init();
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plan->source = hb_face_reference (face);
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plan->dest = hb_face_builder_create ();
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plan->codepoint_to_glyph = hb_map_create();
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plan->glyph_map = hb_map_create();
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plan->reverse_glyph_map = hb_map_create();
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plan->_glyphset = _populate_gids_to_retain (face,
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input->unicodes,
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input->glyphs,
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!plan->drop_layout,
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plan->unicodes,
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plan->codepoint_to_glyph,
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&plan->glyphs_deprecated);
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_create_old_gid_to_new_gid_map (face,
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input->retain_gids,
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plan->glyphs_deprecated,
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plan->glyph_map,
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plan->reverse_glyph_map,
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&plan->_num_output_glyphs);
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return plan;
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}
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/**
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* hb_subset_plan_destroy:
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*
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* Since: 1.7.5
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**/
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void
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hb_subset_plan_destroy (hb_subset_plan_t *plan)
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{
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if (!hb_object_destroy (plan)) return;
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hb_set_destroy (plan->unicodes);
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plan->glyphs_deprecated.fini ();
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hb_face_destroy (plan->source);
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hb_face_destroy (plan->dest);
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hb_map_destroy (plan->codepoint_to_glyph);
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hb_map_destroy (plan->glyph_map);
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hb_map_destroy (plan->reverse_glyph_map);
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hb_set_destroy (plan->_glyphset);
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free (plan);
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}
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