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Diffstat (limited to 'gfx/harfbuzz/src/hb-ot-var-cvar-table.hh')
| -rw-r--r-- | gfx/harfbuzz/src/hb-ot-var-cvar-table.hh | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/hb-ot-var-cvar-table.hh b/gfx/harfbuzz/src/hb-ot-var-cvar-table.hh new file mode 100644 index 0000000000..7fd0f1d79d --- /dev/null +++ b/gfx/harfbuzz/src/hb-ot-var-cvar-table.hh @@ -0,0 +1,157 @@ +/* + * Copyright © 2023 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. + * + */ + +#ifndef HB_OT_VAR_CVAR_TABLE_HH +#define HB_OT_VAR_CVAR_TABLE_HH + +#include "hb-ot-var-common.hh" + + +namespace OT { +/* + * cvar -- control value table (CVT) Variations + * https://docs.microsoft.com/en-us/typography/opentype/spec/cvar + */ +#define HB_OT_TAG_cvar HB_TAG('c','v','a','r') + +struct cvar +{ + static constexpr hb_tag_t tableTag = HB_OT_TAG_cvar; + + bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (c->check_struct (this) && + version.sanitize (c) && likely (version.major == 1) && + tupleVariationData.sanitize (c)); + } + + const TupleVariationData* get_tuple_var_data (void) const + { return &tupleVariationData; } + + static bool calculate_cvt_deltas (unsigned axis_count, + hb_array_t<int> coords, + unsigned num_cvt_item, + const TupleVariationData *tuple_var_data, + const void *base, + hb_vector_t<float>& cvt_deltas /* OUT */) + { + if (!coords) return true; + hb_vector_t<unsigned> shared_indices; + TupleVariationData::tuple_iterator_t iterator; + unsigned var_data_length = tuple_var_data->get_size (axis_count); + hb_bytes_t var_data_bytes = hb_bytes_t (reinterpret_cast<const char*> (tuple_var_data), var_data_length); + if (!TupleVariationData::get_tuple_iterator (var_data_bytes, axis_count, base, + shared_indices, &iterator)) + return true; /* isn't applied at all */ + + hb_array_t<const F2DOT14> shared_tuples = hb_array<F2DOT14> (); + hb_vector_t<unsigned> private_indices; + hb_vector_t<int> unpacked_deltas; + + do + { + float scalar = iterator.current_tuple->calculate_scalar (coords, axis_count, shared_tuples); + if (scalar == 0.f) continue; + const HBUINT8 *p = iterator.get_serialized_data (); + unsigned int length = iterator.current_tuple->get_data_size (); + if (unlikely (!iterator.var_data_bytes.check_range (p, length))) + return false; + + const HBUINT8 *end = p + length; + + bool has_private_points = iterator.current_tuple->has_private_points (); + if (has_private_points && + !TupleVariationData::unpack_points (p, private_indices, end)) + return false; + const hb_vector_t<unsigned int> &indices = has_private_points ? private_indices : shared_indices; + + bool apply_to_all = (indices.length == 0); + unsigned num_deltas = apply_to_all ? num_cvt_item : indices.length; + if (unlikely (!unpacked_deltas.resize (num_deltas, false))) return false; + if (unlikely (!TupleVariationData::unpack_deltas (p, unpacked_deltas, end))) return false; + + for (unsigned int i = 0; i < num_deltas; i++) + { + unsigned int idx = apply_to_all ? i : indices[i]; + if (unlikely (idx >= num_cvt_item)) continue; + if (scalar != 1.0f) cvt_deltas[idx] += unpacked_deltas[i] * scalar ; + else cvt_deltas[idx] += unpacked_deltas[i]; + } + } while (iterator.move_to_next ()); + + return true; + } + + static bool add_cvt_and_apply_deltas (hb_subset_plan_t *plan, + const TupleVariationData *tuple_var_data, + const void *base) + { + const hb_tag_t cvt = HB_TAG('c','v','t',' '); + hb_blob_t *cvt_blob = hb_face_reference_table (plan->source, cvt); + hb_blob_t *cvt_prime_blob = hb_blob_copy_writable_or_fail (cvt_blob); + hb_blob_destroy (cvt_blob); + + if (unlikely (!cvt_prime_blob)) + return false; + + unsigned cvt_blob_length = hb_blob_get_length (cvt_prime_blob); + unsigned num_cvt_item = cvt_blob_length / FWORD::static_size; + + hb_vector_t<float> cvt_deltas; + if (unlikely (!cvt_deltas.resize (num_cvt_item))) + { + hb_blob_destroy (cvt_prime_blob); + return false; + } + + if (!calculate_cvt_deltas (plan->normalized_coords.length, plan->normalized_coords.as_array (), + num_cvt_item, tuple_var_data, base, cvt_deltas)) + { + hb_blob_destroy (cvt_prime_blob); + return false; + } + + FWORD *cvt_prime = (FWORD *) hb_blob_get_data_writable (cvt_prime_blob, nullptr); + for (unsigned i = 0; i < num_cvt_item; i++) + cvt_prime[i] += (int) roundf (cvt_deltas[i]); + + bool success = plan->add_table (cvt, cvt_prime_blob); + hb_blob_destroy (cvt_prime_blob); + return success; + } + + protected: + FixedVersion<>version; /* Version of the CVT variation table + * initially set to 0x00010000u */ + TupleVariationData tupleVariationData; /* TupleVariationDate for cvar table */ + public: + DEFINE_SIZE_MIN (8); +}; + +} /* namespace OT */ + + +#endif /* HB_OT_VAR_CVAR_TABLE_HH */ |