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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
commit26a029d407be480d791972afb5975cf62c9360a6 (patch)
treef435a8308119effd964b339f76abb83a57c29483 /gfx/harfbuzz/src/OT/glyf/glyf-helpers.hh
parentInitial commit. (diff)
downloadfirefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz
firefox-26a029d407be480d791972afb5975cf62c9360a6.zip
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'gfx/harfbuzz/src/OT/glyf/glyf-helpers.hh')
-rw-r--r--gfx/harfbuzz/src/OT/glyf/glyf-helpers.hh127
1 files changed, 127 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/OT/glyf/glyf-helpers.hh b/gfx/harfbuzz/src/OT/glyf/glyf-helpers.hh
new file mode 100644
index 0000000000..d0a5a132f0
--- /dev/null
+++ b/gfx/harfbuzz/src/OT/glyf/glyf-helpers.hh
@@ -0,0 +1,127 @@
+#ifndef OT_GLYF_GLYF_HELPERS_HH
+#define OT_GLYF_GLYF_HELPERS_HH
+
+
+#include "../../hb-open-type.hh"
+#include "../../hb-subset-plan.hh"
+
+#include "loca.hh"
+
+
+namespace OT {
+namespace glyf_impl {
+
+
+template<typename IteratorIn, typename TypeOut,
+ hb_requires (hb_is_source_of (IteratorIn, unsigned int))>
+static void
+_write_loca (IteratorIn&& it,
+ const hb_sorted_vector_t<hb_codepoint_pair_t> new_to_old_gid_list,
+ bool short_offsets,
+ TypeOut *dest,
+ unsigned num_offsets)
+{
+ unsigned right_shift = short_offsets ? 1 : 0;
+ unsigned offset = 0;
+ TypeOut value;
+ value = 0;
+ *dest++ = value;
+ hb_codepoint_t last = 0;
+ for (auto _ : new_to_old_gid_list)
+ {
+ hb_codepoint_t gid = _.first;
+ for (; last < gid; last++)
+ {
+ DEBUG_MSG (SUBSET, nullptr, "loca entry empty offset %u", offset);
+ *dest++ = value;
+ }
+
+ unsigned padded_size = *it++;
+ offset += padded_size;
+ DEBUG_MSG (SUBSET, nullptr, "loca entry gid %u offset %u padded-size %u", gid, offset, padded_size);
+ value = offset >> right_shift;
+ *dest++ = value;
+
+ last++; // Skip over gid
+ }
+ unsigned num_glyphs = num_offsets - 1;
+ for (; last < num_glyphs; last++)
+ {
+ DEBUG_MSG (SUBSET, nullptr, "loca entry empty offset %u", offset);
+ *dest++ = value;
+ }
+}
+
+static bool
+_add_head_and_set_loca_version (hb_subset_plan_t *plan, bool use_short_loca)
+{
+ hb_blob_t *head_blob = hb_sanitize_context_t ().reference_table<head> (plan->source);
+ hb_blob_t *head_prime_blob = hb_blob_copy_writable_or_fail (head_blob);
+ hb_blob_destroy (head_blob);
+
+ if (unlikely (!head_prime_blob))
+ return false;
+
+ head *head_prime = (head *) hb_blob_get_data_writable (head_prime_blob, nullptr);
+ head_prime->indexToLocFormat = use_short_loca ? 0 : 1;
+ if (plan->normalized_coords)
+ {
+ head_prime->xMin = plan->head_maxp_info.xMin;
+ head_prime->xMax = plan->head_maxp_info.xMax;
+ head_prime->yMin = plan->head_maxp_info.yMin;
+ head_prime->yMax = plan->head_maxp_info.yMax;
+
+ unsigned orig_flag = head_prime->flags;
+ if (plan->head_maxp_info.allXMinIsLsb)
+ orig_flag |= 1 << 1;
+ else
+ orig_flag &= ~(1 << 1);
+ head_prime->flags = orig_flag;
+ }
+ bool success = plan->add_table (HB_OT_TAG_head, head_prime_blob);
+
+ hb_blob_destroy (head_prime_blob);
+ return success;
+}
+
+template<typename Iterator,
+ hb_requires (hb_is_source_of (Iterator, unsigned int))>
+static bool
+_add_loca_and_head (hb_subset_context_t *c,
+ Iterator padded_offsets,
+ bool use_short_loca)
+{
+ unsigned num_offsets = c->plan->num_output_glyphs () + 1;
+ unsigned entry_size = use_short_loca ? 2 : 4;
+
+ char *loca_prime_data = (char *) hb_malloc (entry_size * num_offsets);
+
+ if (unlikely (!loca_prime_data)) return false;
+
+ DEBUG_MSG (SUBSET, nullptr, "loca entry_size %u num_offsets %u size %u",
+ entry_size, num_offsets, entry_size * num_offsets);
+
+ if (use_short_loca)
+ _write_loca (padded_offsets, c->plan->new_to_old_gid_list, true, (HBUINT16 *) loca_prime_data, num_offsets);
+ else
+ _write_loca (padded_offsets, c->plan->new_to_old_gid_list, false, (HBUINT32 *) loca_prime_data, num_offsets);
+
+ hb_blob_t *loca_blob = hb_blob_create (loca_prime_data,
+ entry_size * num_offsets,
+ HB_MEMORY_MODE_WRITABLE,
+ loca_prime_data,
+ hb_free);
+
+ bool result = c->plan->add_table (HB_OT_TAG_loca, loca_blob)
+ && _add_head_and_set_loca_version (c->plan, use_short_loca);
+
+ hb_blob_destroy (loca_blob);
+ return result;
+}
+
+
+} /* namespace glyf_impl */
+} /* namespace OT */
+
+
+#endif /* OT_GLYF_GLYF_HELPERS_HH */