harfbuzz/src/hb-font.cc

614 lines
14 KiB
C++

/*
* Copyright © 2009 Red Hat, 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.
*
* Red Hat Author(s): Behdad Esfahbod
*/
#include "hb-private.hh"
#include "hb-ot-layout-private.hh"
#include "hb-font-private.hh"
#include "hb-blob.h"
#include "hb-open-file-private.hh"
#include <string.h>
HB_BEGIN_DECLS
/*
* hb_font_funcs_t
*/
static hb_bool_t
hb_font_get_contour_point_nil (hb_font_t *font HB_UNUSED,
const void *font_data HB_UNUSED,
unsigned int point_index HB_UNUSED,
hb_codepoint_t glyph HB_UNUSED,
hb_position_t *x HB_UNUSED,
hb_position_t *y HB_UNUSED,
const void *user_data HB_UNUSED)
{ return false; }
static void
hb_font_get_glyph_advance_nil (hb_font_t *font HB_UNUSED,
const void *font_data HB_UNUSED,
hb_codepoint_t glyph HB_UNUSED,
hb_position_t *x_advance HB_UNUSED,
hb_position_t *y_advance HB_UNUSED,
const void *user_data HB_UNUSED)
{ }
static void
hb_font_get_glyph_extents_nil (hb_font_t *font HB_UNUSED,
const void *font_data HB_UNUSED,
hb_codepoint_t glyph HB_UNUSED,
hb_glyph_extents_t *extents HB_UNUSED,
const void *user_data HB_UNUSED)
{ }
static hb_codepoint_t
hb_font_get_glyph_nil (hb_font_t *font HB_UNUSED,
const void *font_data HB_UNUSED,
hb_codepoint_t unicode HB_UNUSED,
hb_codepoint_t variation_selector HB_UNUSED,
const void *user_data HB_UNUSED)
{ return 0; }
static hb_position_t
hb_font_get_kerning_nil (hb_font_t *font HB_UNUSED,
const void *font_data HB_UNUSED,
hb_codepoint_t first_glyph HB_UNUSED,
hb_codepoint_t second_glyph HB_UNUSED,
const void *user_data HB_UNUSED)
{ return 0; }
static hb_font_funcs_t _hb_font_funcs_nil = {
HB_OBJECT_HEADER_STATIC,
TRUE, /* immutable */
{
hb_font_get_contour_point_nil,
hb_font_get_glyph_advance_nil,
hb_font_get_glyph_extents_nil,
hb_font_get_glyph_nil,
hb_font_get_kerning_nil
}
};
hb_font_funcs_t *
hb_font_funcs_create (void)
{
hb_font_funcs_t *ffuncs;
if (!(ffuncs = hb_object_create<hb_font_funcs_t> ()))
return &_hb_font_funcs_nil;
ffuncs->get = _hb_font_funcs_nil.get;
return ffuncs;
}
hb_font_funcs_t *
hb_font_funcs_reference (hb_font_funcs_t *ffuncs)
{
return hb_object_reference (ffuncs);
}
void
hb_font_funcs_destroy (hb_font_funcs_t *ffuncs)
{
if (!hb_object_destroy (ffuncs)) return;
#define DESTROY(name) if (ffuncs->destroy.name) ffuncs->destroy.name (ffuncs->user_data.name)
DESTROY (contour_point);
DESTROY (glyph_advance);
DESTROY (glyph_extents);
DESTROY (glyph);
DESTROY (kerning);
#undef DESTROY
free (ffuncs);
}
hb_bool_t
hb_font_funcs_set_user_data (hb_font_funcs_t *ffuncs,
hb_user_data_key_t *key,
void * data,
hb_destroy_func_t destroy)
{
return hb_object_set_user_data (ffuncs, key, data, destroy);
}
void *
hb_font_funcs_get_user_data (hb_font_funcs_t *ffuncs,
hb_user_data_key_t *key)
{
return hb_object_get_user_data (ffuncs, key);
}
void
hb_font_funcs_make_immutable (hb_font_funcs_t *ffuncs)
{
if (hb_object_is_inert (ffuncs))
return;
ffuncs->immutable = TRUE;
}
hb_bool_t
hb_font_funcs_is_immutable (hb_font_funcs_t *ffuncs)
{
return ffuncs->immutable;
}
#define IMPLEMENT(name) \
\
void \
hb_font_funcs_set_##name##_func (hb_font_funcs_t *ffuncs, \
hb_font_get_##name##_func_t func, \
void *user_data, \
hb_destroy_func_t destroy) \
{ \
if (ffuncs->immutable) \
return; \
\
if (ffuncs->destroy.name) \
ffuncs->destroy.name (ffuncs->user_data.name); \
\
if (func) { \
ffuncs->get.name = func; \
ffuncs->user_data.name = user_data; \
ffuncs->destroy.name = destroy; \
} else { \
ffuncs->get.name = hb_font_get_##name##_nil; \
ffuncs->user_data.name = NULL; \
ffuncs->destroy.name = NULL; \
} \
}
IMPLEMENT (contour_point);
IMPLEMENT (glyph_advance);
IMPLEMENT (glyph_extents);
IMPLEMENT (glyph);
IMPLEMENT (kerning);
#undef IMPLEMENT
hb_bool_t
hb_font_get_contour_point (hb_font_t *font,
unsigned int point_index,
hb_codepoint_t glyph, hb_position_t *x, hb_position_t *y)
{
*x = 0; *y = 0;
return font->klass->get.contour_point (font, font->user_data,
point_index,
glyph, x, y,
font->klass->user_data.contour_point);
}
void
hb_font_get_glyph_advance (hb_font_t *font,
hb_codepoint_t glyph,
hb_position_t *x_advance, hb_position_t *y_advance)
{
*x_advance = *y_advance = 0;
return font->klass->get.glyph_advance (font, font->user_data,
glyph, x_advance, y_advance,
font->klass->user_data.glyph_advance);
}
void
hb_font_get_glyph_extents (hb_font_t *font,
hb_codepoint_t glyph, hb_glyph_extents_t *extents)
{
memset (extents, 0, sizeof (*extents));
return font->klass->get.glyph_extents (font, font->user_data,
glyph, extents,
font->klass->user_data.glyph_extents);
}
hb_codepoint_t
hb_font_get_glyph (hb_font_t *font,
hb_codepoint_t unicode, hb_codepoint_t variation_selector)
{
return font->klass->get.glyph (font, font->user_data,
unicode, variation_selector,
font->klass->user_data.glyph);
}
hb_position_t
hb_font_get_kerning (hb_font_t *font,
hb_codepoint_t first_glyph, hb_codepoint_t second_glyph)
{
return font->klass->get.kerning (font, font->user_data,
first_glyph, second_glyph,
font->klass->user_data.kerning);
}
/*
* hb_face_t
*/
static hb_face_t _hb_face_nil = {
HB_OBJECT_HEADER_STATIC,
NULL, /* get_table */
NULL, /* user_data */
NULL, /* destroy */
NULL /* ot_layout */
};
hb_face_t *
hb_face_create_for_tables (hb_get_table_func_t get_table,
void *user_data,
hb_destroy_func_t destroy)
{
hb_face_t *face;
if (!get_table || !(face = hb_object_create<hb_face_t> ())) {
if (destroy)
destroy (user_data);
return &_hb_face_nil;
}
face->get_table = get_table;
face->user_data = user_data;
face->destroy = destroy;
face->ot_layout = _hb_ot_layout_create (face);
return face;
}
typedef struct _hb_face_for_data_closure_t {
hb_blob_t *blob;
unsigned int index;
} hb_face_for_data_closure_t;
static hb_face_for_data_closure_t *
_hb_face_for_data_closure_create (hb_blob_t *blob, unsigned int index)
{
hb_face_for_data_closure_t *closure;
closure = (hb_face_for_data_closure_t *) malloc (sizeof (hb_face_for_data_closure_t));
if (unlikely (!closure))
return NULL;
closure->blob = blob;
closure->index = index;
return closure;
}
static void
_hb_face_for_data_closure_destroy (hb_face_for_data_closure_t *closure)
{
hb_blob_destroy (closure->blob);
free (closure);
}
static hb_blob_t *
_hb_face_for_data_get_table (hb_tag_t tag, void *user_data)
{
hb_face_for_data_closure_t *data = (hb_face_for_data_closure_t *) user_data;
const OpenTypeFontFile &ot_file = *Sanitizer<OpenTypeFontFile>::lock_instance (data->blob);
const OpenTypeFontFace &ot_face = ot_file.get_face (data->index);
const OpenTypeTable &table = ot_face.get_table_by_tag (tag);
hb_blob_t *blob = hb_blob_create_sub_blob (data->blob, table.offset, table.length);
return blob;
}
hb_face_t *
hb_face_create_for_data (hb_blob_t *blob,
unsigned int index)
{
if (unlikely (!blob || !hb_blob_get_length (blob)))
return &_hb_face_nil;
hb_face_for_data_closure_t *closure = _hb_face_for_data_closure_create (Sanitizer<OpenTypeFontFile>::sanitize (hb_blob_reference (blob)), index);
if (unlikely (!closure))
return &_hb_face_nil;
return hb_face_create_for_tables (_hb_face_for_data_get_table,
closure,
(hb_destroy_func_t) _hb_face_for_data_closure_destroy);
}
hb_face_t *
hb_face_reference (hb_face_t *face)
{
return hb_object_reference (face);
}
void
hb_face_destroy (hb_face_t *face)
{
if (!hb_object_destroy (face)) return;
_hb_ot_layout_destroy (face->ot_layout);
if (face->destroy)
face->destroy (face->user_data);
free (face);
}
hb_bool_t
hb_face_set_user_data (hb_face_t *face,
hb_user_data_key_t *key,
void * data,
hb_destroy_func_t destroy)
{
return hb_object_set_user_data (face, key, data, destroy);
}
void *
hb_face_get_user_data (hb_face_t *face,
hb_user_data_key_t *key)
{
return hb_object_get_user_data (face, key);
}
hb_blob_t *
hb_face_reference_table (hb_face_t *face,
hb_tag_t tag)
{
hb_blob_t *blob;
if (unlikely (!face || !face->get_table))
return hb_blob_get_empty ();
blob = face->get_table (tag, face->user_data);
if (unlikely (!blob))
return hb_blob_get_empty ();
return blob;
}
unsigned int
hb_face_get_upem (hb_face_t *face)
{
return _hb_ot_layout_get_upem (face);
}
/*
* hb_font_t
*/
static hb_font_t _hb_font_nil = {
HB_OBJECT_HEADER_STATIC,
TRUE, /* immutable */
NULL, /* parent */
&_hb_face_nil,
0, /* x_scale */
0, /* y_scale */
0, /* x_ppem */
0, /* y_ppem */
&_hb_font_funcs_nil, /* klass */
NULL, /* user_data */
NULL /* destroy */
};
hb_font_t *
hb_font_create (hb_face_t *face)
{
hb_font_t *font;
if (unlikely (!face))
face = &_hb_face_nil;
if (unlikely (hb_object_is_inert (face)))
return &_hb_font_nil;
if (!(font = hb_object_create<hb_font_t> ()))
return &_hb_font_nil;
font->face = hb_face_reference (face);
font->klass = &_hb_font_funcs_nil;
return font;
}
hb_font_t *
hb_font_create_sub_font (hb_font_t *parent)
{
if (unlikely (!parent))
return &_hb_font_nil;
hb_font_t *font = hb_font_create (parent->face);
if (unlikely (hb_object_is_inert (font)))
return font;
hb_font_make_immutable (parent);
font->parent = hb_font_reference (parent);
font->x_scale = parent->x_scale;
font->y_scale = parent->y_scale;
font->x_ppem = parent->x_ppem;
font->y_ppem = parent->y_ppem;
/* We can safely copy user_data from parent since we hold a reference
* onto it and it's immutable. We should not copy the destroy notifiers
* though. */
font->klass = hb_font_funcs_reference (parent->klass);
font->user_data = parent->user_data;
return font;
}
hb_font_t *
hb_font_reference (hb_font_t *font)
{
return hb_object_reference (font);
}
void
hb_font_destroy (hb_font_t *font)
{
if (!hb_object_destroy (font)) return;
hb_font_destroy (font->parent);
hb_face_destroy (font->face);
hb_font_funcs_destroy (font->klass);
if (font->destroy)
font->destroy (font->user_data);
free (font);
}
hb_bool_t
hb_font_set_user_data (hb_font_t *font,
hb_user_data_key_t *key,
void * data,
hb_destroy_func_t destroy)
{
return hb_object_set_user_data (font, key, data, destroy);
}
void *
hb_font_get_user_data (hb_font_t *font,
hb_user_data_key_t *key)
{
return hb_object_get_user_data (font, key);
}
void
hb_font_make_immutable (hb_font_t *font)
{
if (hb_object_is_inert (font))
return;
font->immutable = true;
}
hb_bool_t
hb_font_is_immutable (hb_font_t *font)
{
return font->immutable;
}
hb_font_t *
hb_font_get_parent (hb_font_t *font)
{
return font->parent;
}
hb_face_t *
hb_font_get_face (hb_font_t *font)
{
return font->face;
}
void
hb_font_set_funcs (hb_font_t *font,
hb_font_funcs_t *klass,
void *user_data,
hb_destroy_func_t destroy)
{
if (font->immutable)
return;
if (font->destroy)
font->destroy (font->user_data);
if (!klass)
klass = &_hb_font_funcs_nil;
hb_font_funcs_reference (klass);
hb_font_funcs_destroy (font->klass);
font->klass = klass;
font->user_data = user_data;
font->destroy = destroy;
}
void
hb_font_set_scale (hb_font_t *font,
int x_scale,
int y_scale)
{
if (font->immutable)
return;
font->x_scale = x_scale;
font->y_scale = y_scale;
}
void
hb_font_get_scale (hb_font_t *font,
int *x_scale,
int *y_scale)
{
if (x_scale) *x_scale = font->x_scale;
if (y_scale) *y_scale = font->y_scale;
}
void
hb_font_set_ppem (hb_font_t *font,
unsigned int x_ppem,
unsigned int y_ppem)
{
if (font->immutable)
return;
font->x_ppem = x_ppem;
font->y_ppem = y_ppem;
}
void
hb_font_get_ppem (hb_font_t *font,
unsigned int *x_ppem,
unsigned int *y_ppem)
{
if (x_ppem) *x_ppem = font->x_ppem;
if (y_ppem) *y_ppem = font->y_ppem;
}
HB_END_DECLS