Revision 868ee5b1adf71c29a1727d6f007ddb2a90f00cb4 authored by cltbld on 23 September 2011, 00:19:58 UTC, committed by cltbld on 23 September 2011, 00:19:58 UTC
--HG-- branch : GECKO60_2011080402_RELBRANCH
hb-font.cc
/*
* Copyright (C) 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.h"
#include "hb-font-private.h"
#include "hb-blob-private.h"
#include "hb-open-file-private.hh"
#include "hb-ot-layout-private.hh"
#include <string.h>
HB_BEGIN_DECLS
/*
* hb_font_funcs_t
*/
static hb_codepoint_t
hb_font_get_glyph_nil (hb_font_t *font HB_UNUSED,
hb_face_t *face HB_UNUSED,
const void *user_data HB_UNUSED,
hb_codepoint_t unicode HB_UNUSED,
hb_codepoint_t variation_selector HB_UNUSED)
{ return 0; }
static void
hb_font_get_glyph_advance_nil (hb_font_t *font HB_UNUSED,
hb_face_t *face HB_UNUSED,
const void *user_data HB_UNUSED,
hb_codepoint_t glyph HB_UNUSED,
hb_position_t *x_advance HB_UNUSED,
hb_position_t *y_advance HB_UNUSED)
{ }
static void
hb_font_get_glyph_extents_nil (hb_font_t *font HB_UNUSED,
hb_face_t *face HB_UNUSED,
const void *user_data HB_UNUSED,
hb_codepoint_t glyph HB_UNUSED,
hb_glyph_extents_t *extents HB_UNUSED)
{ }
static hb_bool_t
hb_font_get_contour_point_nil (hb_font_t *font HB_UNUSED,
hb_face_t *face HB_UNUSED,
const void *user_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)
{ return false; }
static hb_position_t
hb_font_get_kerning_nil (hb_font_t *font HB_UNUSED,
hb_face_t *face HB_UNUSED,
const void *user_data HB_UNUSED,
hb_codepoint_t first_glyph HB_UNUSED,
hb_codepoint_t second_glyph HB_UNUSED)
{ return 0; }
hb_font_funcs_t _hb_font_funcs_nil = {
HB_REFERENCE_COUNT_INVALID, /* ref_count */
TRUE, /* immutable */
{
hb_font_get_glyph_nil,
hb_font_get_glyph_advance_nil,
hb_font_get_glyph_extents_nil,
hb_font_get_contour_point_nil,
hb_font_get_kerning_nil
}
};
hb_font_funcs_t *
hb_font_funcs_create (void)
{
hb_font_funcs_t *ffuncs;
if (!HB_OBJECT_DO_CREATE (hb_font_funcs_t, ffuncs))
return &_hb_font_funcs_nil;
ffuncs->v = _hb_font_funcs_nil.v;
return ffuncs;
}
hb_font_funcs_t *
hb_font_funcs_reference (hb_font_funcs_t *ffuncs)
{
HB_OBJECT_DO_REFERENCE (ffuncs);
}
unsigned int
hb_font_funcs_get_reference_count (hb_font_funcs_t *ffuncs)
{
HB_OBJECT_DO_GET_REFERENCE_COUNT (ffuncs);
}
void
hb_font_funcs_destroy (hb_font_funcs_t *ffuncs)
{
HB_OBJECT_DO_DESTROY (ffuncs);
free (ffuncs);
}
hb_font_funcs_t *
hb_font_funcs_copy (hb_font_funcs_t *other_ffuncs)
{
hb_font_funcs_t *ffuncs;
if (!HB_OBJECT_DO_CREATE (hb_font_funcs_t, ffuncs))
return &_hb_font_funcs_nil;
ffuncs->v = other_ffuncs->v;
return ffuncs;
}
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;
}
void
hb_font_funcs_set_glyph_func (hb_font_funcs_t *ffuncs,
hb_font_get_glyph_func_t glyph_func)
{
if (ffuncs->immutable)
return;
ffuncs->v.get_glyph = glyph_func ? glyph_func : hb_font_get_glyph_nil;
}
void
hb_font_funcs_set_glyph_advance_func (hb_font_funcs_t *ffuncs,
hb_font_get_glyph_advance_func_t glyph_advance_func)
{
if (ffuncs->immutable)
return;
ffuncs->v.get_glyph_advance = glyph_advance_func ? glyph_advance_func : hb_font_get_glyph_advance_nil;
}
void
hb_font_funcs_set_glyph_extents_func (hb_font_funcs_t *ffuncs,
hb_font_get_glyph_extents_func_t glyph_extents_func)
{
if (ffuncs->immutable)
return;
ffuncs->v.get_glyph_extents = glyph_extents_func ? glyph_extents_func : hb_font_get_glyph_extents_nil;
}
void
hb_font_funcs_set_contour_point_func (hb_font_funcs_t *ffuncs,
hb_font_get_contour_point_func_t contour_point_func)
{
if (ffuncs->immutable)
return;
ffuncs->v.get_contour_point = contour_point_func ? contour_point_func : hb_font_get_contour_point_nil;
}
void
hb_font_funcs_set_kerning_func (hb_font_funcs_t *ffuncs,
hb_font_get_kerning_func_t kerning_func)
{
if (ffuncs->immutable)
return;
ffuncs->v.get_kerning = kerning_func ? kerning_func : hb_font_get_kerning_nil;
}
hb_font_get_glyph_func_t
hb_font_funcs_get_glyph_func (hb_font_funcs_t *ffuncs)
{
return ffuncs->v.get_glyph;
}
hb_font_get_glyph_advance_func_t
hb_font_funcs_get_glyph_advance_func (hb_font_funcs_t *ffuncs)
{
return ffuncs->v.get_glyph_advance;
}
hb_font_get_glyph_extents_func_t
hb_font_funcs_get_glyph_extents_func (hb_font_funcs_t *ffuncs)
{
return ffuncs->v.get_glyph_extents;
}
hb_font_get_contour_point_func_t
hb_font_funcs_get_contour_point_func (hb_font_funcs_t *ffuncs)
{
return ffuncs->v.get_contour_point;
}
hb_font_get_kerning_func_t
hb_font_funcs_get_kerning_func (hb_font_funcs_t *ffuncs)
{
return ffuncs->v.get_kerning;
}
hb_codepoint_t
hb_font_get_glyph (hb_font_t *font, hb_face_t *face,
hb_codepoint_t unicode, hb_codepoint_t variation_selector)
{
return font->klass->v.get_glyph (font, face, font->user_data,
unicode, variation_selector);
}
void
hb_font_get_glyph_advance (hb_font_t *font, hb_face_t *face,
hb_codepoint_t glyph,
hb_position_t *x_advance, hb_position_t *y_advance)
{
*x_advance = *y_advance = 0;
return font->klass->v.get_glyph_advance (font, face, font->user_data,
glyph, x_advance, y_advance);
}
void
hb_font_get_glyph_extents (hb_font_t *font, hb_face_t *face,
hb_codepoint_t glyph, hb_glyph_extents_t *extents)
{
memset (extents, 0, sizeof (*extents));
return font->klass->v.get_glyph_extents (font, face, font->user_data,
glyph, extents);
}
hb_bool_t
hb_font_get_contour_point (hb_font_t *font, hb_face_t *face,
unsigned int point_index,
hb_codepoint_t glyph, hb_position_t *x, hb_position_t *y)
{
*x = 0; *y = 0;
return font->klass->v.get_contour_point (font, face, font->user_data,
point_index,
glyph, x, y);
}
hb_position_t
hb_font_get_kerning (hb_font_t *font, hb_face_t *face,
hb_codepoint_t first_glyph, hb_codepoint_t second_glyph)
{
return font->klass->v.get_kerning (font, face, font->user_data,
first_glyph, second_glyph);
}
/*
* hb_face_t
*/
static hb_face_t _hb_face_nil = {
HB_REFERENCE_COUNT_INVALID, /* ref_count */
NULL, /* get_table */
NULL, /* destroy */
NULL, /* user_data */
NULL, /* head_blob */
NULL, /* head_table */
NULL /* ot_layout */
};
hb_face_t *
hb_face_create_for_tables (hb_get_table_func_t get_table,
hb_destroy_func_t destroy,
void *user_data)
{
hb_face_t *face;
if (!HB_OBJECT_DO_CREATE (hb_face_t, face)) {
if (destroy)
destroy (user_data);
return &_hb_face_nil;
}
face->get_table = get_table;
face->destroy = destroy;
face->user_data = user_data;
face->ot_layout = _hb_ot_layout_new (face);
face->head_blob = Sanitizer<head>::sanitize (hb_face_get_table (face, HB_OT_TAG_head));
face->head_table = Sanitizer<head>::lock_instance (face->head_blob);
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);
hb_blob_unlock (data->blob);
return blob;
}
hb_face_t *
hb_face_create_for_data (hb_blob_t *blob,
unsigned int index)
{
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,
(hb_destroy_func_t) _hb_face_for_data_closure_destroy,
closure);
}
hb_face_t *
hb_face_reference (hb_face_t *face)
{
HB_OBJECT_DO_REFERENCE (face);
}
unsigned int
hb_face_get_reference_count (hb_face_t *face)
{
HB_OBJECT_DO_GET_REFERENCE_COUNT (face);
}
void
hb_face_destroy (hb_face_t *face)
{
HB_OBJECT_DO_DESTROY (face);
_hb_ot_layout_free (face->ot_layout);
hb_blob_unlock (face->head_blob);
hb_blob_destroy (face->head_blob);
if (face->destroy)
face->destroy (face->user_data);
free (face);
}
hb_blob_t *
hb_face_get_table (hb_face_t *face,
hb_tag_t tag)
{
hb_blob_t *blob;
if (unlikely (!face || !face->get_table))
return &_hb_blob_nil;
blob = face->get_table (tag, face->user_data);
return blob;
}
unsigned int
hb_face_get_upem (hb_face_t *face)
{
return (face->head_table ? face->head_table : &Null(head))->get_upem ();
}
/*
* hb_font_t
*/
static hb_font_t _hb_font_nil = {
HB_REFERENCE_COUNT_INVALID, /* ref_count */
0, /* x_scale */
0, /* y_scale */
0, /* x_ppem */
0, /* y_ppem */
NULL, /* klass */
NULL, /* destroy */
NULL /* user_data */
};
hb_font_t *
hb_font_create (void)
{
hb_font_t *font;
if (!HB_OBJECT_DO_CREATE (hb_font_t, font))
return &_hb_font_nil;
font->klass = &_hb_font_funcs_nil;
return font;
}
hb_font_t *
hb_font_reference (hb_font_t *font)
{
HB_OBJECT_DO_REFERENCE (font);
}
unsigned int
hb_font_get_reference_count (hb_font_t *font)
{
HB_OBJECT_DO_GET_REFERENCE_COUNT (font);
}
void
hb_font_destroy (hb_font_t *font)
{
HB_OBJECT_DO_DESTROY (font);
hb_font_funcs_destroy (font->klass);
if (font->destroy)
font->destroy (font->user_data);
free (font);
}
void
hb_font_set_funcs (hb_font_t *font,
hb_font_funcs_t *klass,
hb_destroy_func_t destroy,
void *user_data)
{
if (HB_OBJECT_IS_INERT (font))
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->destroy = destroy;
font->user_data = user_data;
}
void
hb_font_unset_funcs (hb_font_t *font,
hb_font_funcs_t **klass,
hb_destroy_func_t *destroy,
void **user_data)
{
/* None of the input arguments can be NULL. */
*klass = font->klass;
*destroy = font->destroy;
*user_data = font->user_data;
if (HB_OBJECT_IS_INERT (font))
return;
font->klass = NULL;
font->destroy = NULL;
font->user_data = NULL;
}
void
hb_font_set_scale (hb_font_t *font,
unsigned int x_scale,
unsigned int y_scale)
{
if (HB_OBJECT_IS_INERT (font))
return;
font->x_scale = x_scale;
font->y_scale = y_scale;
}
void
hb_font_get_scale (hb_font_t *font,
unsigned int *x_scale,
unsigned 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 (HB_OBJECT_IS_INERT (font))
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
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