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-rw-r--r--gfx/harfbuzz/src/OT/glyf/glyf-helpers.hh104
1 files changed, 104 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..30106b2b98
--- /dev/null
+++ b/gfx/harfbuzz/src/OT/glyf/glyf-helpers.hh
@@ -0,0 +1,104 @@
+#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 IteratorOut,
+ hb_requires (hb_is_source_of (IteratorIn, unsigned int)),
+ hb_requires (hb_is_sink_of (IteratorOut, unsigned))>
+static void
+_write_loca (IteratorIn&& it, bool short_offsets, IteratorOut&& dest)
+{
+ unsigned right_shift = short_offsets ? 1 : 0;
+ unsigned int offset = 0;
+ dest << 0;
+ + it
+ | hb_map ([=, &offset] (unsigned int padded_size)
+ {
+ offset += padded_size;
+ DEBUG_MSG (SUBSET, nullptr, "loca entry offset %u", offset);
+ return offset >> right_shift;
+ })
+ | hb_sink (dest)
+ ;
+}
+
+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_plan_t * plan, Iterator padded_offsets, bool use_short_loca)
+{
+ unsigned num_offsets = padded_offsets.len () + 1;
+ unsigned entry_size = use_short_loca ? 2 : 4;
+ char *loca_prime_data = (char *) hb_calloc (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, true, hb_array ((HBUINT16 *) loca_prime_data, num_offsets));
+ else
+ _write_loca (padded_offsets, false, hb_array ((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 = plan->add_table (HB_OT_TAG_loca, loca_blob)
+ && _add_head_and_set_loca_version (plan, use_short_loca);
+
+ hb_blob_destroy (loca_blob);
+ return result;
+}
+
+
+} /* namespace glyf_impl */
+} /* namespace OT */
+
+
+#endif /* OT_GLYF_GLYF_HELPERS_HH */