790 lines
19 KiB
C++
790 lines
19 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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#include "hb-map.hh"
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/**
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* SECTION:hb-face
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* @title: hb-face
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* @short_description: Font face objects
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* @include: hb.h
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*
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* A font face is an object that represents a single face from within a
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* font family.
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*
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* More precisely, a font face represents a single face in a binary font file.
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* Font faces are typically built from a binary blob and a face index.
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* Font faces are used to create fonts.
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**/
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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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* Fetches the 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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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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/* Zero for the rest is fine. */
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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): Table-referencing function
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* @user_data: A pointer to the user data
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* @destroy: (nullable): A callback to call when @data is not needed anymore
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*
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* Variant of hb_face_create(), built for those cases where it is more
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* convenient to provide data for individual tables instead of the whole font
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* data. With the caveat that hb_face_get_table_tags() does not currently work
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* with faces created this way.
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*
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* Creates a new face object from the specified @user_data and @reference_table_func,
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* with the @destroy callback.
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*
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* Return value: (transfer full): The new face object
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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->num_glyphs.set_relaxed (-1);
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face->data.init0 (face);
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face->table.init0 (face);
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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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uint16_t 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 *) hb_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 = (uint16_t) (index & 0xFFFFu);
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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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hb_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: #hb_blob_t to work upon
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* @index: The index of the face within @blob
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*
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* Constructs a new face object from the specified blob and
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* a face index into that blob.
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*
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* The face index is used for blobs of file formats such as TTC and
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* and DFont that can contain more than one face. Face indices within
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* such collections are zero-based.
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*
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* <note>Note: If the blob font format is not a collection, @index
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* is ignored. Otherwise, only the lower 16-bits of @index are used.
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* The unmodified @index can be accessed via hb_face_get_index().</note>
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*
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* <note>Note: The high 16-bits of @index, if non-zero, are used by
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* hb_font_create() to load named-instances in variable fonts. See
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* hb_font_create() for details.</note>
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*
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* Return value: (transfer full): The new face object
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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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blob = hb_sanitize_context_t ().sanitize_blob<OT::OpenTypeFontFile> (hb_blob_reference (blob));
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hb_face_for_data_closure_t *closure = _hb_face_for_data_closure_create (blob, index);
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if (unlikely (!closure))
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{
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hb_blob_destroy (blob);
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return hb_face_get_empty ();
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}
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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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* Fetches the singleton empty face object.
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*
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* Return value: (transfer full): The empty face object
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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 ()
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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 object
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*
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* Increases the reference count on a face object.
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*
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* Return value: The @face object
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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 object
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*
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* Decreases the reference count on a face object. When the
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* reference count reaches zero, the face is destroyed,
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* freeing all memory.
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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; 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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hb_free (node);
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node = next;
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}
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face->data.fini ();
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face->table.fini ();
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if (face->destroy)
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face->destroy (face->user_data);
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hb_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 object
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* @key: The user-data key to set
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* @data: A pointer to the user data
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* @destroy: (nullable): A callback to call when @data is not needed anymore
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* @replace: Whether to replace an existing data with the same key
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*
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* Attaches a user-data key/data pair to the given face object.
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*
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* Return value: %true if success, %false otherwise
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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 object
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* @key: The user-data key to query
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*
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* Fetches the user data associated with the specified key,
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* attached to the specified face object.
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*
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* Return value: (transfer none): A pointer to the user data
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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 object
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*
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* Makes the given face object immutable.
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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 (hb_object_is_immutable (face))
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return;
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hb_object_make_immutable (face);
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}
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/**
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* hb_face_is_immutable:
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* @face: A face object
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*
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* Tests whether the given face object is immutable.
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*
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* Return value: %true is @face is immutable, %false otherwise
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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 hb_object_is_immutable (face);
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}
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/**
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* hb_face_reference_table:
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* @face: A face object
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* @tag: The #hb_tag_t of the table to query
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*
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* Fetches a reference to the specified table within
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* the specified face.
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*
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* Return value: (transfer full): A pointer to the @tag table within @face
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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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if (unlikely (tag == HB_TAG_NONE))
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return hb_blob_get_empty ();
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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 object
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*
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* Fetches a pointer to the binary blob that contains the
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* specified face. Returns an empty blob if referencing face data is not
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* possible.
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*
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* Return value: (transfer full): A pointer to the blob for @face
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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 object
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* @index: The index to assign
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*
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* Assigns the specified face-index to @face. Fails if the
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* face is immutable.
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*
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* <note>Note: changing the index has no effect on the face itself
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* This only changes the value returned by hb_face_get_index().</note>
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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 (hb_object_is_immutable (face))
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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 object
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*
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* Fetches the face-index corresponding to the given face.
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*
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* <note>Note: face indices within a collection are zero-based.</note>
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*
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* Return value: The index of @face.
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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 object
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* @upem: The units-per-em value to assign
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*
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* Sets the units-per-em (upem) for a face object to the specified value.
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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 (hb_object_is_immutable (face))
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return;
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face->upem.set_relaxed (upem);
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}
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/**
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* hb_face_get_upem:
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* @face: A face object
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*
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* Fetches the units-per-em (upem) value of the specified face object.
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*
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* Return value: The upem value of @face
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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 object
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* @glyph_count: The glyph-count value to assign
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*
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* Sets the glyph count for a face object to the specified value.
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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 (hb_object_is_immutable (face))
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return;
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face->num_glyphs.set_relaxed (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 object
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*
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* Fetches the glyph-count value of the specified face object.
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*
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* Return value: The glyph-count value of @face
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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 object
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* @start_offset: The index of first table tag to retrieve
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* @table_count: (inout): Input = the maximum number of table tags to return;
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* Output = the actual number of table tags returned (may be zero)
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* @table_tags: (out) (array length=table_count): The array of table tags found
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*
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* Fetches a list of all table tags for a face, if possible. The list returned will
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* begin at the offset provided
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*
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* Return value: Total number of tables, or zero if it is not possible to list
|
|
*
|
|
* Since: 1.6.0
|
|
**/
|
|
unsigned int
|
|
hb_face_get_table_tags (const hb_face_t *face,
|
|
unsigned int start_offset,
|
|
unsigned int *table_count, /* IN/OUT */
|
|
hb_tag_t *table_tags /* OUT */)
|
|
{
|
|
if (face->destroy != (hb_destroy_func_t) _hb_face_for_data_closure_destroy)
|
|
{
|
|
if (table_count)
|
|
*table_count = 0;
|
|
return 0;
|
|
}
|
|
|
|
hb_face_for_data_closure_t *data = (hb_face_for_data_closure_t *) face->user_data;
|
|
|
|
const OT::OpenTypeFontFile &ot_file = *data->blob->as<OT::OpenTypeFontFile> ();
|
|
const OT::OpenTypeFontFace &ot_face = ot_file.get_face (data->index);
|
|
|
|
return ot_face.get_table_tags (start_offset, table_count, table_tags);
|
|
}
|
|
|
|
|
|
/*
|
|
* Character set.
|
|
*/
|
|
|
|
|
|
#ifndef HB_NO_FACE_COLLECT_UNICODES
|
|
/**
|
|
* hb_face_collect_unicodes:
|
|
* @face: A face object
|
|
* @out: The set to add Unicode characters to
|
|
*
|
|
* Collects all of the Unicode characters covered by @face and adds
|
|
* them to the #hb_set_t set @out.
|
|
*
|
|
* Since: 1.9.0
|
|
*/
|
|
void
|
|
hb_face_collect_unicodes (hb_face_t *face,
|
|
hb_set_t *out)
|
|
{
|
|
face->table.cmap->collect_unicodes (out, face->get_num_glyphs ());
|
|
}
|
|
/**
|
|
* hb_face_collect_variation_selectors:
|
|
* @face: A face object
|
|
* @out: The set to add Variation Selector characters to
|
|
*
|
|
* Collects all Unicode "Variation Selector" characters covered by @face and adds
|
|
* them to the #hb_set_t set @out.
|
|
*
|
|
* Since: 1.9.0
|
|
*/
|
|
void
|
|
hb_face_collect_variation_selectors (hb_face_t *face,
|
|
hb_set_t *out)
|
|
{
|
|
face->table.cmap->collect_variation_selectors (out);
|
|
}
|
|
/**
|
|
* hb_face_collect_variation_unicodes:
|
|
* @face: A face object
|
|
* @variation_selector: The Variation Selector to query
|
|
* @out: The set to add Unicode characters to
|
|
*
|
|
* Collects all Unicode characters for @variation_selector covered by @face and adds
|
|
* them to the #hb_set_t set @out.
|
|
*
|
|
* Since: 1.9.0
|
|
*/
|
|
void
|
|
hb_face_collect_variation_unicodes (hb_face_t *face,
|
|
hb_codepoint_t variation_selector,
|
|
hb_set_t *out)
|
|
{
|
|
face->table.cmap->collect_variation_unicodes (variation_selector, out);
|
|
}
|
|
#endif
|
|
|
|
|
|
/*
|
|
* face-builder: A face that has add_table().
|
|
*/
|
|
|
|
struct hb_face_builder_data_t
|
|
{
|
|
hb_hashmap_t<hb_tag_t, hb_blob_t *> tables;
|
|
};
|
|
|
|
static int compare_entries (const void* pa, const void* pb)
|
|
{
|
|
const auto& a = * (const hb_pair_t<hb_tag_t, hb_blob_t*> *) pa;
|
|
const auto& b = * (const hb_pair_t<hb_tag_t, hb_blob_t*> *) pb;
|
|
|
|
/* Order by blob size first (smallest to largest) and then table tag */
|
|
|
|
if (a.second->length != b.second->length)
|
|
return a.second->length < b.second->length ? -1 : +1;
|
|
|
|
return a.first < b.first ? -1 : a.first == b.first ? 0 : +1;
|
|
}
|
|
|
|
static hb_face_builder_data_t *
|
|
_hb_face_builder_data_create ()
|
|
{
|
|
hb_face_builder_data_t *data = (hb_face_builder_data_t *) hb_calloc (1, sizeof (hb_face_builder_data_t));
|
|
if (unlikely (!data))
|
|
return nullptr;
|
|
|
|
data->tables.init ();
|
|
|
|
return data;
|
|
}
|
|
|
|
static void
|
|
_hb_face_builder_data_destroy (void *user_data)
|
|
{
|
|
hb_face_builder_data_t *data = (hb_face_builder_data_t *) user_data;
|
|
|
|
for (hb_blob_t* b : data->tables.values())
|
|
hb_blob_destroy (b);
|
|
|
|
data->tables.fini ();
|
|
|
|
hb_free (data);
|
|
}
|
|
|
|
static hb_blob_t *
|
|
_hb_face_builder_data_reference_blob (hb_face_builder_data_t *data)
|
|
{
|
|
|
|
unsigned int table_count = data->tables.get_population ();
|
|
unsigned int face_length = table_count * 16 + 12;
|
|
|
|
for (hb_blob_t* b : data->tables.values())
|
|
face_length += hb_ceil_to_4 (hb_blob_get_length (b));
|
|
|
|
char *buf = (char *) hb_malloc (face_length);
|
|
if (unlikely (!buf))
|
|
return nullptr;
|
|
|
|
hb_serialize_context_t c (buf, face_length);
|
|
c.propagate_error (data->tables);
|
|
OT::OpenTypeFontFile *f = c.start_serialize<OT::OpenTypeFontFile> ();
|
|
|
|
bool is_cff = (data->tables.has (HB_TAG ('C','F','F',' '))
|
|
|| data->tables.has (HB_TAG ('C','F','F','2')));
|
|
hb_tag_t sfnt_tag = is_cff ? OT::OpenTypeFontFile::CFFTag : OT::OpenTypeFontFile::TrueTypeTag;
|
|
|
|
// Sort the tags so that produced face is deterministic.
|
|
hb_vector_t<hb_pair_t <hb_tag_t, hb_blob_t*>> sorted_entries;
|
|
data->tables.iter () | hb_sink (sorted_entries);
|
|
if (unlikely (sorted_entries.in_error ()))
|
|
{
|
|
hb_free (buf);
|
|
return nullptr;
|
|
}
|
|
|
|
sorted_entries.qsort (compare_entries);
|
|
bool ret = f->serialize_single (&c, sfnt_tag, + sorted_entries.iter());
|
|
|
|
c.end_serialize ();
|
|
|
|
if (unlikely (!ret))
|
|
{
|
|
hb_free (buf);
|
|
return nullptr;
|
|
}
|
|
|
|
return hb_blob_create (buf, face_length, HB_MEMORY_MODE_WRITABLE, buf, hb_free);
|
|
}
|
|
|
|
static hb_blob_t *
|
|
_hb_face_builder_reference_table (hb_face_t *face HB_UNUSED, hb_tag_t tag, void *user_data)
|
|
{
|
|
hb_face_builder_data_t *data = (hb_face_builder_data_t *) user_data;
|
|
|
|
if (!tag)
|
|
return _hb_face_builder_data_reference_blob (data);
|
|
|
|
return hb_blob_reference (data->tables[tag]);
|
|
}
|
|
|
|
|
|
/**
|
|
* hb_face_builder_create:
|
|
*
|
|
* Creates a #hb_face_t that can be used with hb_face_builder_add_table().
|
|
* After tables are added to the face, it can be compiled to a binary
|
|
* font file by calling hb_face_reference_blob().
|
|
*
|
|
* Return value: (transfer full): New face.
|
|
*
|
|
* Since: 1.9.0
|
|
**/
|
|
hb_face_t *
|
|
hb_face_builder_create ()
|
|
{
|
|
hb_face_builder_data_t *data = _hb_face_builder_data_create ();
|
|
if (unlikely (!data)) return hb_face_get_empty ();
|
|
|
|
return hb_face_create_for_tables (_hb_face_builder_reference_table,
|
|
data,
|
|
_hb_face_builder_data_destroy);
|
|
}
|
|
|
|
/**
|
|
* hb_face_builder_add_table:
|
|
* @face: A face object created with hb_face_builder_create()
|
|
* @tag: The #hb_tag_t of the table to add
|
|
* @blob: The blob containing the table data to add
|
|
*
|
|
* Add table for @tag with data provided by @blob to the face. @face must
|
|
* be created using hb_face_builder_create().
|
|
*
|
|
* Since: 1.9.0
|
|
**/
|
|
hb_bool_t
|
|
hb_face_builder_add_table (hb_face_t *face, hb_tag_t tag, hb_blob_t *blob)
|
|
{
|
|
if (tag == HB_MAP_VALUE_INVALID)
|
|
return false;
|
|
|
|
if (unlikely (face->destroy != (hb_destroy_func_t) _hb_face_builder_data_destroy))
|
|
return false;
|
|
|
|
hb_face_builder_data_t *data = (hb_face_builder_data_t *) face->user_data;
|
|
|
|
hb_blob_t* previous = data->tables.get (tag);
|
|
if (!data->tables.set (tag, hb_blob_reference (blob)))
|
|
{
|
|
hb_blob_destroy (blob);
|
|
return false;
|
|
}
|
|
|
|
hb_blob_destroy (previous);
|
|
return true;
|
|
}
|