--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.desktop/share/native/libfontmanager/harfbuzz/hb-subset-glyf.cc Fri Mar 01 16:59:19 2019 -0800
@@ -0,0 +1,310 @@
+/*
+ * 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
+ */
+
+#include "hb-open-type.hh"
+#include "hb-ot-glyf-table.hh"
+#include "hb-set.h"
+#include "hb-subset-glyf.hh"
+
+static bool
+_calculate_glyf_and_loca_prime_size (const OT::glyf::accelerator_t &glyf,
+ hb_vector_t<hb_codepoint_t> &glyph_ids,
+ hb_bool_t drop_hints,
+ bool *use_short_loca /* OUT */,
+ unsigned int *glyf_size /* OUT */,
+ unsigned int *loca_size /* OUT */,
+ hb_vector_t<unsigned int> *instruction_ranges /* OUT */)
+{
+ unsigned int total = 0;
+ for (unsigned int i = 0; i < glyph_ids.length; i++)
+ {
+ hb_codepoint_t next_glyph = glyph_ids[i];
+ if (!instruction_ranges->resize (instruction_ranges->length + 2))
+ {
+ DEBUG_MSG(SUBSET, nullptr, "Failed to resize instruction_ranges.");
+ return false;
+ }
+ unsigned int *instruction_start = &(*instruction_ranges)[instruction_ranges->length - 2];
+ *instruction_start = 0;
+ unsigned int *instruction_end = &(*instruction_ranges)[instruction_ranges->length - 1];
+ *instruction_end = 0;
+
+ unsigned int start_offset, end_offset;
+ if (unlikely (!(glyf.get_offsets (next_glyph, &start_offset, &end_offset) &&
+ glyf.remove_padding (start_offset, &end_offset))))
+ {
+ DEBUG_MSG(SUBSET, nullptr, "Invalid gid %d", next_glyph);
+ continue;
+ }
+ if (end_offset - start_offset < OT::glyf::GlyphHeader::static_size)
+ continue; /* 0-length glyph */
+
+ if (drop_hints)
+ {
+ if (unlikely (!glyf.get_instruction_offsets (start_offset, end_offset,
+ instruction_start, instruction_end)))
+ {
+ DEBUG_MSG(SUBSET, nullptr, "Unable to get instruction offsets for %d", next_glyph);
+ return false;
+ }
+ }
+
+ total += end_offset - start_offset - (*instruction_end - *instruction_start);
+ /* round2 so short loca will work */
+ total += total % 2;
+ }
+
+ *glyf_size = total;
+ *use_short_loca = (total <= 131070);
+ *loca_size = (glyph_ids.length + 1)
+ * (*use_short_loca ? sizeof (OT::HBUINT16) : sizeof (OT::HBUINT32));
+
+ DEBUG_MSG(SUBSET, nullptr, "preparing to subset glyf: final size %d, loca size %d, using %s loca",
+ total,
+ *loca_size,
+ *use_short_loca ? "short" : "long");
+ return true;
+}
+
+static bool
+_write_loca_entry (unsigned int id,
+ unsigned int offset,
+ bool is_short,
+ void *loca_prime,
+ unsigned int loca_size)
+{
+ unsigned int entry_size = is_short ? sizeof (OT::HBUINT16) : sizeof (OT::HBUINT32);
+ if ((id + 1) * entry_size <= loca_size)
+ {
+ if (is_short) {
+ ((OT::HBUINT16*) loca_prime) [id].set (offset / 2);
+ } else {
+ ((OT::HBUINT32*) loca_prime) [id].set (offset);
+ }
+ return true;
+ }
+
+ // Offset was not written because the write is out of bounds.
+ DEBUG_MSG(SUBSET,
+ nullptr,
+ "WARNING: Attempted to write an out of bounds loca entry at index %d. Loca size is %d.",
+ id,
+ loca_size);
+ return false;
+}
+
+static void
+_update_components (hb_subset_plan_t * plan,
+ char * glyph_start,
+ unsigned int length)
+{
+ OT::glyf::CompositeGlyphHeader::Iterator iterator;
+ if (OT::glyf::CompositeGlyphHeader::get_iterator (glyph_start,
+ length,
+ &iterator))
+ {
+ do
+ {
+ hb_codepoint_t new_gid;
+ if (!plan->new_gid_for_old_gid (iterator.current->glyphIndex,
+ &new_gid))
+ continue;
+
+ ((OT::glyf::CompositeGlyphHeader *) iterator.current)->glyphIndex.set (new_gid);
+ } while (iterator.move_to_next ());
+ }
+}
+
+static bool _remove_composite_instruction_flag (char *glyf_prime, unsigned int length)
+{
+ /* remove WE_HAVE_INSTRUCTIONS from flags in dest */
+ OT::glyf::CompositeGlyphHeader::Iterator composite_it;
+ if (unlikely (!OT::glyf::CompositeGlyphHeader::get_iterator (glyf_prime, length, &composite_it))) return false;
+ const OT::glyf::CompositeGlyphHeader *glyph;
+ do {
+ glyph = composite_it.current;
+ OT::HBUINT16 *flags = const_cast<OT::HBUINT16 *> (&glyph->flags);
+ flags->set ( (uint16_t) *flags & ~OT::glyf::CompositeGlyphHeader::WE_HAVE_INSTRUCTIONS);
+ } while (composite_it.move_to_next ());
+ return true;
+}
+
+static bool
+_write_glyf_and_loca_prime (hb_subset_plan_t *plan,
+ const OT::glyf::accelerator_t &glyf,
+ const char *glyf_data,
+ bool use_short_loca,
+ hb_vector_t<unsigned int> &instruction_ranges,
+ unsigned int glyf_prime_size,
+ char *glyf_prime_data /* OUT */,
+ unsigned int loca_prime_size,
+ char *loca_prime_data /* OUT */)
+{
+ hb_vector_t<hb_codepoint_t> &glyph_ids = plan->glyphs;
+ char *glyf_prime_data_next = glyf_prime_data;
+
+ bool success = true;
+ for (unsigned int i = 0; i < glyph_ids.length; i++)
+ {
+ unsigned int start_offset, end_offset;
+ if (unlikely (!(glyf.get_offsets (glyph_ids[i], &start_offset, &end_offset) &&
+ glyf.remove_padding (start_offset, &end_offset))))
+ end_offset = start_offset = 0;
+
+ unsigned int instruction_start = instruction_ranges[i * 2];
+ unsigned int instruction_end = instruction_ranges[i * 2 + 1];
+
+ int length = end_offset - start_offset - (instruction_end - instruction_start);
+
+ if (glyf_prime_data_next + length > glyf_prime_data + glyf_prime_size)
+ {
+ DEBUG_MSG(SUBSET,
+ nullptr,
+ "WARNING: Attempted to write an out of bounds glyph entry for gid %d (length %d)",
+ i, length);
+ return false;
+ }
+
+ if (instruction_start == instruction_end)
+ memcpy (glyf_prime_data_next, glyf_data + start_offset, length);
+ else
+ {
+ memcpy (glyf_prime_data_next, glyf_data + start_offset, instruction_start - start_offset);
+ memcpy (glyf_prime_data_next + instruction_start - start_offset, glyf_data + instruction_end, end_offset - instruction_end);
+ /* if the instructions end at the end this was a composite glyph, else simple */
+ if (instruction_end == end_offset)
+ {
+ if (unlikely (!_remove_composite_instruction_flag (glyf_prime_data_next, length))) return false;
+ }
+ else
+ /* zero instruction length, which is just before instruction_start */
+ memset (glyf_prime_data_next + instruction_start - start_offset - 2, 0, 2);
+ }
+
+ success = success && _write_loca_entry (i,
+ glyf_prime_data_next - glyf_prime_data,
+ use_short_loca,
+ loca_prime_data,
+ loca_prime_size);
+ _update_components (plan, glyf_prime_data_next, length);
+
+ // TODO: don't align to two bytes if using long loca.
+ glyf_prime_data_next += length + (length % 2); // Align to 2 bytes for short loca.
+ }
+
+ success = success && _write_loca_entry (glyph_ids.length,
+ glyf_prime_data_next - glyf_prime_data,
+ use_short_loca,
+ loca_prime_data,
+ loca_prime_size);
+ return success;
+}
+
+static bool
+_hb_subset_glyf_and_loca (const OT::glyf::accelerator_t &glyf,
+ const char *glyf_data,
+ hb_subset_plan_t *plan,
+ bool *use_short_loca,
+ hb_blob_t **glyf_prime /* OUT */,
+ hb_blob_t **loca_prime /* OUT */)
+{
+ // TODO(grieger): Sanity check allocation size for the new table.
+ hb_vector_t<hb_codepoint_t> &glyphs_to_retain = plan->glyphs;
+
+ unsigned int glyf_prime_size;
+ unsigned int loca_prime_size;
+ hb_vector_t<unsigned int> instruction_ranges;
+ instruction_ranges.init ();
+
+ if (unlikely (!_calculate_glyf_and_loca_prime_size (glyf,
+ glyphs_to_retain,
+ plan->drop_hints,
+ use_short_loca,
+ &glyf_prime_size,
+ &loca_prime_size,
+ &instruction_ranges))) {
+ instruction_ranges.fini ();
+ return false;
+ }
+
+ char *glyf_prime_data = (char *) calloc (1, glyf_prime_size);
+ char *loca_prime_data = (char *) calloc (1, loca_prime_size);
+ if (unlikely (!_write_glyf_and_loca_prime (plan, glyf, glyf_data,
+ *use_short_loca,
+ instruction_ranges,
+ glyf_prime_size, glyf_prime_data,
+ loca_prime_size, loca_prime_data))) {
+ free (glyf_prime_data);
+ free (loca_prime_data);
+ instruction_ranges.fini ();
+ return false;
+ }
+ instruction_ranges.fini ();
+
+ *glyf_prime = hb_blob_create (glyf_prime_data,
+ glyf_prime_size,
+ HB_MEMORY_MODE_READONLY,
+ glyf_prime_data,
+ free);
+ *loca_prime = hb_blob_create (loca_prime_data,
+ loca_prime_size,
+ HB_MEMORY_MODE_READONLY,
+ loca_prime_data,
+ free);
+ return true;
+}
+
+/**
+ * hb_subset_glyf:
+ * Subsets the glyph table according to a provided plan.
+ *
+ * Return value: subsetted glyf table.
+ *
+ * Since: 1.7.5
+ **/
+bool
+hb_subset_glyf_and_loca (hb_subset_plan_t *plan,
+ bool *use_short_loca, /* OUT */
+ hb_blob_t **glyf_prime, /* OUT */
+ hb_blob_t **loca_prime /* OUT */)
+{
+ hb_blob_t *glyf_blob = hb_sanitize_context_t ().reference_table<OT::glyf> (plan->source);
+ const char *glyf_data = hb_blob_get_data (glyf_blob, nullptr);
+
+ OT::glyf::accelerator_t glyf;
+ glyf.init (plan->source);
+ bool result = _hb_subset_glyf_and_loca (glyf,
+ glyf_data,
+ plan,
+ use_short_loca,
+ glyf_prime,
+ loca_prime);
+
+ hb_blob_destroy (glyf_blob);
+ glyf.fini ();
+
+ return result;
+}