728 lines
15 KiB
C++
728 lines
15 KiB
C++
/*
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* Copyright © 2009 Red Hat, Inc.
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* Copyright © 2012 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Red Hat Author(s): Behdad Esfahbod
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* Google Author(s): Behdad Esfahbod
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*/
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#include "hb.hh"
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#include "hb-face.hh"
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#include "hb-blob.hh"
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#include "hb-open-file.hh"
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#include "hb-ot-face.hh"
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#include "hb-ot-cmap-table.hh"
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/**
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* hb_face_count:
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* @blob: a blob.
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*
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* Get number of faces in a blob.
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*
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* Return value: Number of faces in @blob
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*
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* Since: 1.7.7
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**/
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unsigned int
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hb_face_count (hb_blob_t *blob)
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{
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if (unlikely (!blob))
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return 0;
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/* TODO We shouldn't be sanitizing blob. Port to run sanitizer and return if not sane. */
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/* Make API signature const after. */
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hb_blob_t *sanitized = hb_sanitize_context_t ().sanitize_blob<OT::OpenTypeFontFile> (hb_blob_reference (blob));
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const OT::OpenTypeFontFile& ot = *sanitized->as<OT::OpenTypeFontFile> ();
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unsigned int ret = ot.get_face_count ();
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hb_blob_destroy (sanitized);
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return ret;
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}
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/*
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* hb_face_t
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*/
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DEFINE_NULL_INSTANCE (hb_face_t) =
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{
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HB_OBJECT_HEADER_STATIC,
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true, /* immutable */
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nullptr, /* reference_table_func */
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nullptr, /* user_data */
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nullptr, /* destroy */
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0, /* index */
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1000, /* upem */
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0, /* num_glyphs */
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{
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#define HB_SHAPER_IMPLEMENT(shaper) HB_ATOMIC_PTR_INIT (HB_SHAPER_DATA_INVALID),
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#include "hb-shaper-list.hh"
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#undef HB_SHAPER_IMPLEMENT
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},
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HB_ATOMIC_PTR_INIT (nullptr), /* shape_plans */
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};
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/**
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* hb_face_create_for_tables:
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* @reference_table_func: (closure user_data) (destroy destroy) (scope notified):
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* @user_data:
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* @destroy:
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*
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*
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*
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* Return value: (transfer full)
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*
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* Since: 0.9.2
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**/
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hb_face_t *
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hb_face_create_for_tables (hb_reference_table_func_t reference_table_func,
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void *user_data,
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hb_destroy_func_t destroy)
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{
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hb_face_t *face;
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if (!reference_table_func || !(face = hb_object_create<hb_face_t> ())) {
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if (destroy)
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destroy (user_data);
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return hb_face_get_empty ();
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}
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face->reference_table_func = reference_table_func;
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face->user_data = user_data;
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face->destroy = destroy;
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face->upem = 0;
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face->num_glyphs = (unsigned int) -1;
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return face;
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}
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typedef struct hb_face_for_data_closure_t {
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hb_blob_t *blob;
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unsigned int index;
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} hb_face_for_data_closure_t;
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static hb_face_for_data_closure_t *
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_hb_face_for_data_closure_create (hb_blob_t *blob, unsigned int index)
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{
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hb_face_for_data_closure_t *closure;
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closure = (hb_face_for_data_closure_t *) calloc (1, sizeof (hb_face_for_data_closure_t));
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if (unlikely (!closure))
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return nullptr;
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closure->blob = blob;
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closure->index = index;
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return closure;
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}
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static void
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_hb_face_for_data_closure_destroy (void *data)
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{
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hb_face_for_data_closure_t *closure = (hb_face_for_data_closure_t *) data;
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hb_blob_destroy (closure->blob);
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free (closure);
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}
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static hb_blob_t *
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_hb_face_for_data_reference_table (hb_face_t *face HB_UNUSED, hb_tag_t tag, void *user_data)
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{
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hb_face_for_data_closure_t *data = (hb_face_for_data_closure_t *) user_data;
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if (tag == HB_TAG_NONE)
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return hb_blob_reference (data->blob);
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const OT::OpenTypeFontFile &ot_file = *data->blob->as<OT::OpenTypeFontFile> ();
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unsigned int base_offset;
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const OT::OpenTypeFontFace &ot_face = ot_file.get_face (data->index, &base_offset);
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const OT::OpenTypeTable &table = ot_face.get_table_by_tag (tag);
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hb_blob_t *blob = hb_blob_create_sub_blob (data->blob, base_offset + table.offset, table.length);
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return blob;
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}
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/**
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* hb_face_create: (Xconstructor)
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* @blob:
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* @index:
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*
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*
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*
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* Return value: (transfer full):
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*
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* Since: 0.9.2
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**/
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hb_face_t *
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hb_face_create (hb_blob_t *blob,
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unsigned int index)
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{
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hb_face_t *face;
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if (unlikely (!blob))
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blob = hb_blob_get_empty ();
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hb_face_for_data_closure_t *closure = _hb_face_for_data_closure_create (hb_sanitize_context_t ().sanitize_blob<OT::OpenTypeFontFile> (hb_blob_reference (blob)), index);
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if (unlikely (!closure))
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return hb_face_get_empty ();
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face = hb_face_create_for_tables (_hb_face_for_data_reference_table,
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closure,
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_hb_face_for_data_closure_destroy);
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face->index = index;
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return face;
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}
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/**
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* hb_face_get_empty:
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*
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*
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*
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* Return value: (transfer full)
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*
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* Since: 0.9.2
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**/
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hb_face_t *
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hb_face_get_empty (void)
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{
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return const_cast<hb_face_t *> (&Null(hb_face_t));
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}
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/**
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* hb_face_reference: (skip)
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* @face: a face.
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*
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*
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*
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* Return value:
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*
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* Since: 0.9.2
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**/
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hb_face_t *
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hb_face_reference (hb_face_t *face)
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{
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return hb_object_reference (face);
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}
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/**
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* hb_face_destroy: (skip)
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* @face: a face.
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*
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*
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*
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* Since: 0.9.2
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**/
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void
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hb_face_destroy (hb_face_t *face)
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{
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if (!hb_object_destroy (face)) return;
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for (hb_face_t::plan_node_t *node = face->shape_plans.get (); node; )
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{
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hb_face_t::plan_node_t *next = node->next;
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hb_shape_plan_destroy (node->shape_plan);
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free (node);
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node = next;
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}
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#define HB_SHAPER_IMPLEMENT(shaper) HB_SHAPER_DATA_DESTROY(shaper, face);
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#include "hb-shaper-list.hh"
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#undef HB_SHAPER_IMPLEMENT
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if (face->destroy)
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face->destroy (face->user_data);
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free (face);
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}
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/**
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* hb_face_set_user_data: (skip)
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* @face: a face.
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* @key:
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* @data:
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* @destroy:
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* @replace:
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*
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*
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*
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* Return value:
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*
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* Since: 0.9.2
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**/
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hb_bool_t
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hb_face_set_user_data (hb_face_t *face,
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hb_user_data_key_t *key,
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void * data,
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hb_destroy_func_t destroy,
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hb_bool_t replace)
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{
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return hb_object_set_user_data (face, key, data, destroy, replace);
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}
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/**
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* hb_face_get_user_data: (skip)
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* @face: a face.
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* @key:
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*
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*
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*
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* Return value: (transfer none):
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*
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* Since: 0.9.2
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**/
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void *
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hb_face_get_user_data (const hb_face_t *face,
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hb_user_data_key_t *key)
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{
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return hb_object_get_user_data (face, key);
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}
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/**
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* hb_face_make_immutable:
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* @face: a face.
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*
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*
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*
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* Since: 0.9.2
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**/
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void
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hb_face_make_immutable (hb_face_t *face)
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{
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if (unlikely (hb_object_is_inert (face)))
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return;
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if (face->immutable)
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return;
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face->immutable = true;
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}
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/**
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* hb_face_is_immutable:
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* @face: a face.
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*
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*
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*
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* Return value:
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*
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* Since: 0.9.2
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**/
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hb_bool_t
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hb_face_is_immutable (const hb_face_t *face)
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{
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return face->immutable;
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}
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/**
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* hb_face_reference_table:
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* @face: a face.
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* @tag:
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*
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*
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*
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* Return value: (transfer full):
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*
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* Since: 0.9.2
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**/
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hb_blob_t *
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hb_face_reference_table (const hb_face_t *face,
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hb_tag_t tag)
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{
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return face->reference_table (tag);
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}
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/**
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* hb_face_reference_blob:
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* @face: a face.
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*
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*
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*
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* Return value: (transfer full):
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*
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* Since: 0.9.2
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**/
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hb_blob_t *
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hb_face_reference_blob (hb_face_t *face)
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{
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return face->reference_table (HB_TAG_NONE);
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}
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/**
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* hb_face_set_index:
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* @face: a face.
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* @index:
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*
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*
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*
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* Since: 0.9.2
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**/
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void
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hb_face_set_index (hb_face_t *face,
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unsigned int index)
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{
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if (face->immutable)
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return;
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face->index = index;
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}
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/**
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* hb_face_get_index:
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* @face: a face.
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*
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*
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*
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* Return value:
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*
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* Since: 0.9.2
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**/
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unsigned int
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hb_face_get_index (const hb_face_t *face)
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{
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return face->index;
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}
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/**
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* hb_face_set_upem:
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* @face: a face.
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* @upem:
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*
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*
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*
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* Since: 0.9.2
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**/
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void
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hb_face_set_upem (hb_face_t *face,
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unsigned int upem)
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{
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if (face->immutable)
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return;
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face->upem = upem;
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}
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/**
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* hb_face_get_upem:
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* @face: a face.
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*
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*
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*
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* Return value:
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*
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* Since: 0.9.2
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**/
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unsigned int
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hb_face_get_upem (const hb_face_t *face)
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{
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return face->get_upem ();
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}
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/**
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* hb_face_set_glyph_count:
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* @face: a face.
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* @glyph_count:
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*
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*
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*
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* Since: 0.9.7
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**/
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void
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hb_face_set_glyph_count (hb_face_t *face,
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unsigned int glyph_count)
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{
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if (face->immutable)
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return;
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face->num_glyphs = glyph_count;
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}
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/**
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* hb_face_get_glyph_count:
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* @face: a face.
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*
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*
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*
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* Return value:
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*
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* Since: 0.9.7
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**/
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unsigned int
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hb_face_get_glyph_count (const hb_face_t *face)
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{
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return face->get_num_glyphs ();
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}
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/**
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* hb_face_get_table_tags:
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* @face: a face.
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* @start_offset: index of first tag to return.
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* @table_count: input length of @table_tags array, output number of items written.
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* @table_tags: array to write tags into.
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*
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* Retrieves table tags for a face, if possible.
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*
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* Return value: total number of tables, or 0 if not possible to list.
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*
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* Since: 1.6.0
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**/
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unsigned int
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hb_face_get_table_tags (const hb_face_t *face,
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unsigned int start_offset,
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unsigned int *table_count, /* IN/OUT */
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hb_tag_t *table_tags /* OUT */)
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{
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if (face->destroy != (hb_destroy_func_t) _hb_face_for_data_closure_destroy)
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{
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if (table_count)
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*table_count = 0;
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return 0;
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}
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hb_face_for_data_closure_t *data = (hb_face_for_data_closure_t *) face->user_data;
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const OT::OpenTypeFontFile &ot_file = *data->blob->as<OT::OpenTypeFontFile> ();
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const OT::OpenTypeFontFace &ot_face = ot_file.get_face (data->index);
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return ot_face.get_table_tags (start_offset, table_count, table_tags);
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}
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/*
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* Character set.
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*/
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/**
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* hb_face_collect_unicodes:
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* @face: font face.
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* @out: set to add Unicode characters covered by @face to.
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*
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* Since: 1.9.0
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*/
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void
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hb_face_collect_unicodes (hb_face_t *face,
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hb_set_t *out)
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{
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if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return;
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hb_ot_face_data (face)->cmap->collect_unicodes (out);
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}
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/**
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* hb_face_collect_variation_selectors:
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* @face: font face.
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* @out: set to add Variation Selector characters covered by @face to.
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*
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*
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*
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* Since: 1.9.0
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*/
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void
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hb_face_collect_variation_selectors (hb_face_t *face,
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hb_set_t *out)
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{
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if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return;
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hb_ot_face_data (face)->cmap->collect_variation_selectors (out);
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}
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/**
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* hb_face_collect_variation_unicodes:
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* @face: font face.
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* @out: set to add Unicode characters for @variation_selector covered by @face to.
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*
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*
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*
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* Since: 1.9.0
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*/
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void
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hb_face_collect_variation_unicodes (hb_face_t *face,
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hb_codepoint_t variation_selector,
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hb_set_t *out)
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{
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if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return;
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hb_ot_face_data (face)->cmap->collect_variation_unicodes (variation_selector, out);
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}
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/*
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* face-builder: A face that has add_table().
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*/
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struct hb_face_builder_data_t
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{
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struct table_entry_t
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{
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inline int cmp (const hb_tag_t *t) const
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{
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if (*t < tag) return -1;
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if (*t > tag) return -1;
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return 0;
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}
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hb_tag_t tag;
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hb_blob_t *blob;
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};
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hb_vector_t<table_entry_t, 32> tables;
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};
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static hb_face_builder_data_t *
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_hb_face_builder_data_create (void)
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{
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hb_face_builder_data_t *data = (hb_face_builder_data_t *) calloc (1, sizeof (hb_face_builder_data_t));
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if (unlikely (!data))
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return nullptr;
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data->tables.init ();
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return data;
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}
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static void
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_hb_face_builder_data_destroy (void *user_data)
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{
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hb_face_builder_data_t *data = (hb_face_builder_data_t *) user_data;
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for (unsigned int i = 0; i < data->tables.len; i++)
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hb_blob_destroy (data->tables[i].blob);
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data->tables.fini ();
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free (data);
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}
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static hb_blob_t *
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_hb_face_builder_data_reference_blob (hb_face_builder_data_t *data)
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{
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unsigned int table_count = data->tables.len;
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unsigned int face_length = table_count * 16 + 12;
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for (unsigned int i = 0; i < table_count; i++)
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face_length += hb_ceil_to_4 (hb_blob_get_length (data->tables[i].blob));
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char *buf = (char *) malloc (face_length);
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if (unlikely (!buf))
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return nullptr;
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hb_serialize_context_t c (buf, face_length);
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OT::OpenTypeFontFile *f = c.start_serialize<OT::OpenTypeFontFile> ();
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bool is_cff = data->tables.lsearch (HB_TAG ('C','F','F',' ')) || data->tables.lsearch (HB_TAG ('C','F','F','2'));
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hb_tag_t sfnt_tag = is_cff ? OT::OpenTypeFontFile::CFFTag : OT::OpenTypeFontFile::TrueTypeTag;
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Supplier<hb_tag_t> tags_supplier (&data->tables[0].tag, table_count, sizeof (data->tables[0]));
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Supplier<hb_blob_t *> blobs_supplier (&data->tables[0].blob, table_count, sizeof (data->tables[0]));
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bool ret = f->serialize_single (&c,
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sfnt_tag,
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tags_supplier,
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blobs_supplier,
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table_count);
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c.end_serialize ();
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if (unlikely (!ret))
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{
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free (buf);
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return nullptr;
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}
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return hb_blob_create (buf, face_length, HB_MEMORY_MODE_WRITABLE, buf, free);
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}
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static hb_blob_t *
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_hb_face_builder_reference_table (hb_face_t *face, hb_tag_t tag, void *user_data)
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{
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hb_face_builder_data_t *data = (hb_face_builder_data_t *) user_data;
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if (!tag)
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return _hb_face_builder_data_reference_blob (data);
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hb_face_builder_data_t::table_entry_t *entry = data->tables.lsearch (tag);
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if (entry)
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return hb_blob_reference (entry->blob);
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return nullptr;
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}
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/**
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* hb_face_builder_create:
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*
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* Creates a #hb_face_t that can be used with hb_face_builder_add_table().
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* After tables are added to the face, it can be compiled to a binary
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* font file by calling hb_face_reference_blob().
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*
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* Return value: (transfer full): New face.
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*
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* Since: 1.9.0
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**/
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hb_face_t *
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hb_face_builder_create (void)
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{
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hb_face_builder_data_t *data = _hb_face_builder_data_create ();
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if (unlikely (!data)) return hb_face_get_empty ();
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return hb_face_create_for_tables (_hb_face_builder_reference_table,
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data,
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_hb_face_builder_data_destroy);
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}
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/**
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* hb_face_builder_add_table:
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*
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* Add table for @tag with data provided by @blob to the face. @face must
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* be created using hb_face_builder_create().
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*
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* Since: 1.9.0
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**/
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hb_bool_t
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hb_face_builder_add_table (hb_face_t *face, hb_tag_t tag, hb_blob_t *blob)
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{
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if (unlikely (face->destroy != (hb_destroy_func_t) _hb_face_builder_data_destroy))
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return false;
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hb_face_builder_data_t *data = (hb_face_builder_data_t *) face->user_data;
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hb_face_builder_data_t::table_entry_t *entry = data->tables.push ();
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entry->tag = tag;
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entry->blob = hb_blob_reference (blob);
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return true;
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}
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