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-rw-r--r--src/3rdparty/harfbuzz-ng/src/hb-subset.cc309
1 files changed, 309 insertions, 0 deletions
diff --git a/src/3rdparty/harfbuzz-ng/src/hb-subset.cc b/src/3rdparty/harfbuzz-ng/src/hb-subset.cc
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+++ b/src/3rdparty/harfbuzz-ng/src/hb-subset.cc
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+/*
+ * 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, Rod Sheeter, Behdad Esfahbod
+ */
+
+#include "hb.hh"
+#include "hb-open-type.hh"
+
+#include "hb-subset.hh"
+
+#include "hb-open-file.hh"
+#include "hb-ot-cmap-table.hh"
+#include "hb-ot-glyf-table.hh"
+#include "hb-ot-hdmx-table.hh"
+#include "hb-ot-head-table.hh"
+#include "hb-ot-hhea-table.hh"
+#include "hb-ot-hmtx-table.hh"
+#include "hb-ot-maxp-table.hh"
+#include "hb-ot-os2-table.hh"
+#include "hb-ot-post-table.hh"
+#include "hb-ot-cff1-table.hh"
+#include "hb-ot-cff2-table.hh"
+#include "hb-ot-vorg-table.hh"
+#include "hb-ot-name-table.hh"
+#include "hb-ot-layout-gsub-table.hh"
+#include "hb-ot-layout-gpos-table.hh"
+
+
+HB_UNUSED static inline unsigned int
+_plan_estimate_subset_table_size (hb_subset_plan_t *plan,
+ unsigned int table_len);
+static inline unsigned int
+_plan_estimate_subset_table_size (hb_subset_plan_t *plan,
+ unsigned int table_len)
+{
+ unsigned int src_glyphs = plan->source->get_num_glyphs ();
+ unsigned int dst_glyphs = plan->glyphset ()->get_population ();
+
+ if (unlikely (!src_glyphs))
+ return 512 + table_len;
+
+ return 512 + (unsigned int) (table_len * sqrt ((double) dst_glyphs / src_glyphs));
+}
+
+template<typename TableType>
+static bool
+_subset2 (hb_subset_plan_t *plan)
+{
+ bool result = false;
+ hb_blob_t *source_blob = hb_sanitize_context_t ().reference_table<TableType> (plan->source);
+ const TableType *table = source_blob->as<TableType> ();
+
+ hb_tag_t tag = TableType::tableTag;
+ if (source_blob->data)
+ {
+ hb_vector_t<char> buf;
+ /* TODO Not all tables are glyph-related. 'name' table size for example should not be
+ * affected by number of glyphs. Accommodate that. */
+ unsigned int buf_size = _plan_estimate_subset_table_size (plan, source_blob->length);
+ DEBUG_MSG(SUBSET, nullptr, "OT::%c%c%c%c initial estimated table size: %u bytes.", HB_UNTAG (tag), buf_size);
+ if (unlikely (!buf.alloc (buf_size)))
+ {
+ DEBUG_MSG(SUBSET, nullptr, "OT::%c%c%c%c failed to allocate %u bytes.", HB_UNTAG (tag), buf_size);
+ hb_blob_destroy (source_blob);
+ return false;
+ }
+ retry:
+ hb_serialize_context_t serializer ((void *) buf, buf_size);
+ serializer.start_serialize<TableType> ();
+ hb_subset_context_t c (plan, &serializer);
+ bool needed = table->subset (&c);
+ if (serializer.ran_out_of_room)
+ {
+ buf_size += (buf_size >> 1) + 32;
+ DEBUG_MSG(SUBSET, nullptr, "OT::%c%c%c%c ran out of room; reallocating to %u bytes.", HB_UNTAG (tag), buf_size);
+ if (unlikely (!buf.alloc (buf_size)))
+ {
+ DEBUG_MSG(SUBSET, nullptr, "OT::%c%c%c%c failed to reallocate %u bytes.", HB_UNTAG (tag), buf_size);
+ hb_blob_destroy (source_blob);
+ return false;
+ }
+ goto retry;
+ }
+ serializer.end_serialize ();
+
+ result = !serializer.in_error ();
+
+ if (result)
+ {
+ if (needed)
+ {
+ hb_blob_t *dest_blob = serializer.copy_blob ();
+ DEBUG_MSG(SUBSET, nullptr, "OT::%c%c%c%c final subset table size: %u bytes.", HB_UNTAG (tag), dest_blob->length);
+ result = c.plan->add_table (tag, dest_blob);
+ hb_blob_destroy (dest_blob);
+ }
+ else
+ {
+ DEBUG_MSG(SUBSET, nullptr, "OT::%c%c%c%c::subset table subsetted to empty.", HB_UNTAG (tag));
+ }
+ }
+ }
+ else
+ DEBUG_MSG(SUBSET, nullptr, "OT::%c%c%c%c::subset sanitize failed on source table.", HB_UNTAG (tag));
+
+ hb_blob_destroy (source_blob);
+ DEBUG_MSG(SUBSET, nullptr, "OT::%c%c%c%c::subset %s", HB_UNTAG (tag), result ? "success" : "FAILED!");
+ return result;
+}
+
+template<typename TableType>
+static bool
+_subset (hb_subset_plan_t *plan)
+{
+ hb_blob_t *source_blob = hb_sanitize_context_t ().reference_table<TableType> (plan->source);
+ const TableType *table = source_blob->as<TableType> ();
+
+ hb_tag_t tag = TableType::tableTag;
+ hb_bool_t result = false;
+ if (source_blob->data)
+ result = table->subset (plan);
+ else
+ DEBUG_MSG(SUBSET, nullptr, "OT::%c%c%c%c::subset sanitize failed on source table.", HB_UNTAG (tag));
+
+ hb_blob_destroy (source_blob);
+ DEBUG_MSG(SUBSET, nullptr, "OT::%c%c%c%c::subset %s", HB_UNTAG (tag), result ? "success" : "FAILED!");
+ return result;
+}
+
+
+static bool
+_subset_table (hb_subset_plan_t *plan,
+ hb_tag_t tag)
+{
+ DEBUG_MSG(SUBSET, nullptr, "begin subset %c%c%c%c", HB_UNTAG (tag));
+ bool result = true;
+ switch (tag) {
+ case HB_OT_TAG_glyf:
+ result = _subset2<const OT::glyf> (plan);
+ break;
+ case HB_OT_TAG_hdmx:
+ result = _subset2<const OT::hdmx> (plan);
+ break;
+ case HB_OT_TAG_name:
+ result = _subset2<const OT::name> (plan);
+ break;
+ case HB_OT_TAG_head:
+ // TODO that won't work well if there is no glyf
+ DEBUG_MSG(SUBSET, nullptr, "skip head, handled by glyf");
+ result = true;
+ break;
+ case HB_OT_TAG_hhea:
+ DEBUG_MSG(SUBSET, nullptr, "skip hhea handled by hmtx");
+ return true;
+ case HB_OT_TAG_hmtx:
+ result = _subset2<const OT::hmtx> (plan);
+ break;
+ case HB_OT_TAG_vhea:
+ DEBUG_MSG(SUBSET, nullptr, "skip vhea handled by vmtx");
+ return true;
+ case HB_OT_TAG_vmtx:
+ result = _subset2<const OT::vmtx> (plan);
+ break;
+ case HB_OT_TAG_maxp:
+ result = _subset2<const OT::maxp> (plan);
+ break;
+ case HB_OT_TAG_loca:
+ DEBUG_MSG(SUBSET, nullptr, "skip loca handled by glyf");
+ return true;
+ case HB_OT_TAG_cmap:
+ result = _subset2<const OT::cmap> (plan);
+ break;
+ case HB_OT_TAG_OS2:
+ result = _subset2<const OT::OS2> (plan);
+ break;
+ case HB_OT_TAG_post:
+ result = _subset2<const OT::post> (plan);
+ break;
+
+#ifndef HB_NO_SUBSET_CFF
+ case HB_OT_TAG_cff1:
+ result = _subset<const OT::cff1> (plan);
+ break;
+ case HB_OT_TAG_cff2:
+ result = _subset<const OT::cff2> (plan);
+ break;
+ case HB_OT_TAG_VORG:
+ result = _subset2<const OT::VORG> (plan);
+ break;
+#endif
+
+#ifndef HB_NO_SUBSET_LAYOUT
+ case HB_OT_TAG_GDEF:
+ result = _subset2<const OT::GDEF> (plan);
+ break;
+ case HB_OT_TAG_GSUB:
+ result = _subset2<const OT::GSUB> (plan);
+ break;
+ case HB_OT_TAG_GPOS:
+ result = _subset2<const OT::GPOS> (plan);
+ break;
+#endif
+
+ default:
+ hb_blob_t *source_table = hb_face_reference_table (plan->source, tag);
+ if (likely (source_table))
+ result = plan->add_table (tag, source_table);
+ else
+ result = false;
+ hb_blob_destroy (source_table);
+ break;
+ }
+ DEBUG_MSG(SUBSET, nullptr, "subset %c%c%c%c %s", HB_UNTAG (tag), result ? "ok" : "FAILED");
+ return result;
+}
+
+static bool
+_should_drop_table (hb_subset_plan_t *plan, hb_tag_t tag)
+{
+ if (plan->drop_tables->has (tag))
+ return true;
+
+ switch (tag) {
+ case HB_TAG ('c', 'v', 'a', 'r'): /* hint table, fallthrough */
+ case HB_TAG ('c', 'v', 't', ' '): /* hint table, fallthrough */
+ case HB_TAG ('f', 'p', 'g', 'm'): /* hint table, fallthrough */
+ case HB_TAG ('p', 'r', 'e', 'p'): /* hint table, fallthrough */
+ case HB_TAG ('h', 'd', 'm', 'x'): /* hint table, fallthrough */
+ case HB_TAG ('V', 'D', 'M', 'X'): /* hint table, fallthrough */
+ return plan->drop_hints;
+
+#ifdef HB_NO_SUBSET_LAYOUT
+ // Drop Layout Tables if requested.
+ case HB_OT_TAG_GDEF:
+ case HB_OT_TAG_GPOS:
+ case HB_OT_TAG_GSUB:
+ case HB_TAG ('m', 'o', 'r', 'x'):
+ case HB_TAG ('m', 'o', 'r', 't'):
+ case HB_TAG ('k', 'e', 'r', 'x'):
+ case HB_TAG ('k', 'e', 'r', 'n'):
+ return true;
+#endif
+
+ default:
+ return false;
+ }
+}
+
+/**
+ * hb_subset:
+ * @source: font face data to be subset.
+ * @input: input to use for the subsetting.
+ *
+ * Subsets a font according to provided input.
+ **/
+hb_face_t *
+hb_subset (hb_face_t *source,
+ hb_subset_input_t *input)
+{
+ if (unlikely (!input || !source)) return hb_face_get_empty ();
+
+ hb_subset_plan_t *plan = hb_subset_plan_create (source, input);
+
+ hb_tag_t table_tags[32];
+ unsigned int offset = 0, count;
+ bool success = true;
+ hb_set_t tags_set;
+ do {
+ count = ARRAY_LENGTH (table_tags);
+ hb_face_get_table_tags (source, offset, &count, table_tags);
+ for (unsigned int i = 0; i < count; i++)
+ {
+ hb_tag_t tag = table_tags[i];
+ if (_should_drop_table (plan, tag) && !tags_set.has (tag))
+ {
+ DEBUG_MSG(SUBSET, nullptr, "drop %c%c%c%c", HB_UNTAG (tag));
+ continue;
+ }
+ tags_set.add (tag);
+ success = success && _subset_table (plan, tag);
+ }
+ offset += count;
+ } while (success && count == ARRAY_LENGTH (table_tags));
+
+ hb_face_t *result = success ? hb_face_reference (plan->dest) : hb_face_get_empty ();
+ hb_subset_plan_destroy (plan);
+ return result;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-08 23:17:28 +0000