harfbuzz/src/hb-font.cc

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/*
* Copyright (C) 2009 Red Hat, Inc.
*
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* 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-open-file-private.hh"
#include "hb-blob.h"
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#include "hb-ot-layout-private.h"
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#include <string.h>
/*
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* hb_font_funcs_t
*/
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static hb_codepoint_t
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hb_font_get_glyph_nil (hb_font_t *font HB_GNUC_UNUSED,
hb_face_t *face HB_GNUC_UNUSED,
const void *user_data HB_GNUC_UNUSED,
hb_codepoint_t unicode HB_GNUC_UNUSED,
hb_codepoint_t variation_selector HB_GNUC_UNUSED)
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{ return 0; }
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static hb_bool_t
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hb_font_get_contour_point_nil (hb_font_t *font HB_GNUC_UNUSED,
hb_face_t *face HB_GNUC_UNUSED,
const void *user_data HB_GNUC_UNUSED,
unsigned int point_index HB_GNUC_UNUSED,
hb_codepoint_t glyph HB_GNUC_UNUSED,
hb_position_t *x HB_GNUC_UNUSED,
hb_position_t *y HB_GNUC_UNUSED)
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{ return false; }
static void
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hb_font_get_glyph_metrics_nil (hb_font_t *font HB_GNUC_UNUSED,
hb_face_t *face HB_GNUC_UNUSED,
const void *user_data HB_GNUC_UNUSED,
hb_codepoint_t glyph HB_GNUC_UNUSED,
hb_glyph_metrics_t *metrics HB_GNUC_UNUSED)
{ }
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static hb_position_t
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hb_font_get_kerning_nil (hb_font_t *font HB_GNUC_UNUSED,
hb_face_t *face HB_GNUC_UNUSED,
const void *user_data HB_GNUC_UNUSED,
hb_codepoint_t first_glyph HB_GNUC_UNUSED,
hb_codepoint_t second_glyph HB_GNUC_UNUSED)
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{ return 0; }
hb_font_funcs_t _hb_font_funcs_nil = {
HB_REFERENCE_COUNT_INVALID, /* ref_count */
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TRUE, /* immutable */
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hb_font_get_glyph_nil,
hb_font_get_contour_point_nil,
hb_font_get_glyph_metrics_nil,
hb_font_get_kerning_nil
};
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hb_font_funcs_t *
hb_font_funcs_create (void)
{
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hb_font_funcs_t *ffuncs;
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if (!HB_OBJECT_DO_CREATE (hb_font_funcs_t, ffuncs))
return &_hb_font_funcs_nil;
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return ffuncs;
}
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hb_font_funcs_t *
hb_font_funcs_reference (hb_font_funcs_t *ffuncs)
{
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HB_OBJECT_DO_REFERENCE (ffuncs);
}
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unsigned int
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hb_font_funcs_get_reference_count (hb_font_funcs_t *ffuncs)
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{
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HB_OBJECT_DO_GET_REFERENCE_COUNT (ffuncs);
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}
void
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hb_font_funcs_destroy (hb_font_funcs_t *ffuncs)
{
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HB_OBJECT_DO_DESTROY (ffuncs);
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free (ffuncs);
}
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hb_font_funcs_t *
hb_font_funcs_copy (hb_font_funcs_t *other_ffuncs)
{
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hb_font_funcs_t *ffuncs;
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if (!HB_OBJECT_DO_CREATE (hb_font_funcs_t, ffuncs))
return &_hb_font_funcs_nil;
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*ffuncs = *other_ffuncs;
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/* re-init refcount */
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HB_OBJECT_DO_INIT (ffuncs);
ffuncs->immutable = FALSE;
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return ffuncs;
}
void
hb_font_funcs_make_immutable (hb_font_funcs_t *ffuncs)
{
if (HB_OBJECT_IS_INERT (ffuncs))
return;
ffuncs->immutable = TRUE;
}
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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->get_glyph = glyph_func ? glyph_func : hb_font_get_glyph_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->get_contour_point = contour_point_func ? contour_point_func : hb_font_get_contour_point_nil;
}
void
hb_font_funcs_set_glyph_metrics_func (hb_font_funcs_t *ffuncs,
hb_font_get_glyph_metrics_func_t glyph_metrics_func)
{
if (ffuncs->immutable)
return;
ffuncs->get_glyph_metrics = glyph_metrics_func ? glyph_metrics_func : hb_font_get_glyph_metrics_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->get_kerning = kerning_func ? kerning_func : hb_font_get_kerning_nil;
}
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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->get_glyph (font, face, font->user_data,
unicode, variation_selector);
}
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)
{
return font->klass->get_contour_point (font, face, font->user_data,
point_index,
glyph, x, y);
}
void
hb_font_get_glyph_metrics (hb_font_t *font, hb_face_t *face,
hb_codepoint_t glyph, hb_glyph_metrics_t *metrics)
{
memset (metrics, 0, sizeof (*metrics));
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return font->klass->get_glyph_metrics (font, face, font->user_data,
glyph, metrics);
}
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->get_kerning (font, face, font->user_data,
first_glyph, second_glyph);
}
/*
* hb_face_t
*/
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static hb_blob_t *
_hb_face_get_table_from_blob (hb_tag_t tag, void *user_data)
{
hb_face_t *face = (hb_face_t *) user_data;
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const OpenTypeFontFile &ot_file = *CastP<OpenTypeFontFile> (hb_blob_lock (face->blob));
const OpenTypeFontFace &ot_face = ot_file.get_face (face->index);
const OpenTypeTable &table = ot_face.get_table_by_tag (tag);
hb_blob_t *blob = hb_blob_create_sub_blob (face->blob, table.offset, table.length);
hb_blob_unlock (face->blob);
return blob;
}
static hb_face_t _hb_face_nil = {
HB_REFERENCE_COUNT_INVALID, /* ref_count */
NULL, /* blob */
0, /* index */
NULL, /* get_table */
NULL, /* destroy */
NULL, /* user_data */
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{} /* 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;
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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;
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_hb_ot_layout_init (face);
return face;
}
hb_face_t *
hb_face_create_for_data (hb_blob_t *blob,
unsigned int index)
{
hb_face_t *face;
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if (!HB_OBJECT_DO_CREATE (hb_face_t, face))
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return &_hb_face_nil;
face->blob = Sanitizer<OpenTypeFontFile>::sanitize (hb_blob_reference (blob));
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face->index = index;
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face->get_table = _hb_face_get_table_from_blob;
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face->user_data = face;
_hb_ot_layout_init (face);
return face;
}
hb_face_t *
hb_face_reference (hb_face_t *face)
{
HB_OBJECT_DO_REFERENCE (face);
}
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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);
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_hb_ot_layout_fini (face);
hb_blob_destroy (face->blob);
if (face->destroy)
face->destroy (face->user_data);
free (face);
}
hb_blob_t *
hb_face_get_table (hb_face_t *face,
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hb_tag_t tag)
{
if (HB_UNLIKELY (!face || !face->get_table))
return hb_blob_create_empty ();
return face->get_table (tag, face->user_data);
}
/*
* 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 */
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0, /* y_ppem */
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NULL, /* klass */
NULL, /* destroy */
NULL /* user_data */
};
hb_font_t *
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hb_font_create (void)
{
hb_font_t *font;
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if (!HB_OBJECT_DO_CREATE (hb_font_t, font))
return &_hb_font_nil;
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font->klass = &_hb_font_funcs_nil;
return font;
}
hb_font_t *
hb_font_reference (hb_font_t *font)
{
HB_OBJECT_DO_REFERENCE (font);
}
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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);
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hb_font_funcs_destroy (font->klass);
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if (font->destroy)
font->destroy (font->user_data);
free (font);
}
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void
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hb_font_set_funcs (hb_font_t *font,
hb_font_funcs_t *klass,
hb_destroy_func_t destroy,
void *user_data)
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{
if (HB_OBJECT_IS_INERT (font))
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return;
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if (font->destroy)
font->destroy (font->user_data);
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if (!klass)
klass = &_hb_font_funcs_nil;
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hb_font_funcs_reference (klass);
hb_font_funcs_destroy (font->klass);
font->klass = klass;
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font->destroy = destroy;
font->user_data = user_data;
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}
void
hb_font_set_scale (hb_font_t *font,
hb_16dot16_t x_scale,
hb_16dot16_t y_scale)
{
if (HB_OBJECT_IS_INERT (font))
return;
font->x_scale = x_scale;
font->y_scale = 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;
}