harfbuzz/src/hb-graphite2.cc

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/*
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* Copyright © 2011 Martin Hosken
* Copyright © 2011 SIL International
* Copyright © 2011 Google, 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.
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*
* Google Author(s): Behdad Esfahbod
*/
#include "hb-private.hh"
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#include "hb-graphite2.h"
#include "hb-buffer-private.hh"
#include "hb-font-private.hh"
#include "hb-ot-tag.h"
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#include <graphite2/Font.h>
#include <graphite2/Segment.h>
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struct hb_gr_cluster_t {
unsigned int base_char;
unsigned int num_chars;
unsigned int base_glyph;
unsigned int num_glyphs;
};
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typedef struct hb_gr_tablelist_t {
hb_blob_t *blob;
struct hb_gr_tablelist_t *next;
unsigned int tag;
} hb_gr_tablelist_t;
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static struct hb_gr_face_data_t {
hb_face_t *face;
gr_face *grface;
hb_gr_tablelist_t *tlist;
} _hb_gr_face_data_nil = {NULL, NULL};
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static struct hb_gr_font_data_t {
hb_font_t *font;
gr_font *grfont;
gr_face *grface;
} _hb_gr_font_data_nil = {NULL, NULL, NULL};
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static const void *hb_gr_get_table (const void *data, unsigned int tag, size_t *len)
{
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hb_gr_tablelist_t *pl = NULL, *p;
hb_gr_face_data_t *face = (hb_gr_face_data_t *) data;
hb_gr_tablelist_t *tlist = face->tlist;
for (p = tlist; p; p = p->next)
if (p->tag == tag ) {
unsigned int tlen;
const char *d = hb_blob_get_data (p->blob, &tlen);
*len = tlen;
return d;
} else
pl = p;
if (!face->face)
return NULL;
hb_blob_t *blob = hb_face_reference_table (face->face, tag);
if (!pl || pl->blob)
{
p = (hb_gr_tablelist_t *) malloc (sizeof (hb_gr_tablelist_t));
if (!p) {
hb_blob_destroy(blob);
return NULL;
}
p->next = NULL;
if (pl)
pl->next = p;
else
face->tlist = p;
pl = p;
}
pl->blob = blob;
pl->tag = tag;
unsigned int tlen;
const char *d = hb_blob_get_data (blob, &tlen);
*len = tlen;
return d;
}
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static float hb_gr_get_advance (const void *data, unsigned short gid)
{
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hb_gr_font_data_t *font = (hb_gr_font_data_t *) data;
if (!font->font)
return 0;
return (float) hb_font_get_glyph_h_advance (font->font, gid);
}
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static void _hb_gr_face_data_destroy (void *data)
{
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hb_gr_face_data_t *f = (hb_gr_face_data_t *) data;
hb_gr_tablelist_t *tlist = f->tlist;
while (tlist)
{
hb_gr_tablelist_t *old = tlist;
hb_blob_destroy (tlist->blob);
tlist = tlist->next;
free(old);
}
gr_face_destroy (f->grface);
}
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static void _hb_gr_font_data_destroy (void *data)
{
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hb_gr_font_data_t *f = (hb_gr_font_data_t *) data;
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gr_font_destroy (f->grfont);
}
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static hb_user_data_key_t hb_gr_data_key;
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static hb_gr_face_data_t *
_hb_gr_face_get_data (hb_face_t *face)
{
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hb_gr_face_data_t *data = (hb_gr_face_data_t *) hb_face_get_user_data (face, &hb_gr_data_key);
if (likely (data)) return data;
data = (hb_gr_face_data_t *) calloc (1, sizeof (hb_gr_face_data_t));
if (unlikely (!data))
return &_hb_gr_face_data_nil;
hb_blob_t *silf_blob = hb_face_reference_table (face, HB_GRAPHITE_TAG_Silf);
if (!hb_blob_get_length(silf_blob))
{
hb_blob_destroy(silf_blob);
return &_hb_gr_face_data_nil;
}
data->face = face;
data->grface = gr_make_face (data, &hb_gr_get_table, gr_face_preloadGlyphs);
if (unlikely (!hb_face_set_user_data (face, &hb_gr_data_key, data,
(hb_destroy_func_t) _hb_gr_face_data_destroy,
FALSE)))
{
_hb_gr_face_data_destroy (data);
data = (hb_gr_face_data_t *) hb_face_get_user_data (face, &hb_gr_data_key);
if (data)
return data;
else
return &_hb_gr_face_data_nil;
}
return data;
}
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static hb_gr_font_data_t *
_hb_gr_font_get_data (hb_font_t *font)
{
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hb_gr_font_data_t *data = (hb_gr_font_data_t *) hb_font_get_user_data (font, &hb_gr_data_key);
if (likely (data)) return data;
data = (hb_gr_font_data_t *) calloc (1, sizeof (hb_gr_font_data_t));
if (unlikely (!data))
return &_hb_gr_font_data_nil;
hb_blob_t *silf_blob = hb_face_reference_table (font->face, HB_GRAPHITE_TAG_Silf);
if (!hb_blob_get_length (silf_blob))
{
hb_blob_destroy(silf_blob);
return &_hb_gr_font_data_nil;
}
data->font = font;
data->grface = _hb_gr_face_get_data (font->face)->grface;
int scale;
hb_font_get_scale (font, &scale, NULL);
data->grfont = gr_make_font_with_advance_fn (scale, data, &hb_gr_get_advance, data->grface);
if (unlikely (!hb_font_set_user_data (font, &hb_gr_data_key, data,
(hb_destroy_func_t) _hb_gr_font_data_destroy,
FALSE)))
{
_hb_gr_font_data_destroy (data);
data = (hb_gr_font_data_t *) hb_font_get_user_data (font, &hb_gr_data_key);
if (data)
return data;
else
return &_hb_gr_font_data_nil;
}
return data;
}
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hb_bool_t
hb_graphite_shape (hb_font_t *font,
hb_buffer_t *buffer,
const hb_feature_t *features,
unsigned int num_features,
const char * const *shaper_options)
{
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buffer->guess_properties ();
hb_gr_font_data_t *data = _hb_gr_font_get_data (font);
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if (!data->grface) return FALSE;
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unsigned int charlen;
hb_glyph_info_t *bufferi = hb_buffer_get_glyph_infos (buffer, &charlen);
int success = 0;
if (!charlen) return TRUE;
const char *lang = hb_language_to_string (hb_buffer_get_language (buffer));
const char *lang_end = strchr (lang, '-');
int lang_len = lang_end ? lang_end - lang : -1;
gr_feature_val *feats = gr_face_featureval_for_lang (data->grface, lang ? hb_tag_from_string (lang, lang_len) : 0);
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while (num_features--)
{
const gr_feature_ref *fref = gr_face_find_fref (data->grface, features->tag);
if (fref)
gr_fref_set_feature_value (fref, features->value, feats);
features++;
}
unsigned short *gids = NULL;
hb_gr_cluster_t *clusters = NULL;
gr_segment *seg = NULL;
uint32_t *text = NULL;
unsigned short *pg;
const gr_slot *is;
unsigned int ci = 0, ic = 0;
float curradvx = 0., curradvy = 0.;
unsigned int glyphlen = 0;
unsigned int *p;
text = (uint32_t *) malloc ((charlen + 1) * sizeof (uint32_t));
if (!text) goto dieout;
p = text;
for (unsigned int i = 0; i < charlen; ++i)
*p++ = bufferi++->codepoint;
*p = 0;
hb_tag_t script_tag[2];
hb_ot_tags_from_script (hb_buffer_get_script(buffer), &script_tag[0], &script_tag[1]);
seg = gr_make_seg (data->grfont, data->grface,
script_tag[1] == HB_TAG_NONE ? script_tag[0] : script_tag[1],
feats,
gr_utf32, text, charlen,
2 | (hb_buffer_get_direction(buffer) == HB_DIRECTION_RTL ? 1 : 0));
if (!seg) goto dieout;
glyphlen = gr_seg_n_slots (seg);
clusters = (hb_gr_cluster_t *) calloc (charlen, sizeof (hb_gr_cluster_t));
if (!glyphlen || !clusters) goto dieout;
gids = (unsigned short *) malloc (glyphlen * sizeof (unsigned short));
if (!gids) goto dieout;
pg = gids;
for (is = gr_seg_first_slot (seg), ic = 0; is; is = gr_slot_next_in_segment (is), ic++)
{
unsigned int before = gr_slot_before (is);
unsigned int after = gr_slot_after (is);
*pg = gr_slot_gid (is);
pg++;
while (clusters[ci].base_char > before && ci)
{
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clusters[ci-1].num_chars += clusters[ci].num_chars;
clusters[ci-1].num_glyphs += clusters[ci].num_glyphs;
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ci--;
}
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if (gr_slot_can_insert_before (is) && clusters[ci].num_chars && before >= clusters[ci].base_char + clusters[ci].num_chars)
{
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hb_gr_cluster_t *c = clusters + ci + 1;
c->base_char = clusters[ci].base_char + clusters[ci].num_chars;
c->num_chars = before - c->base_char;
c->base_glyph = ic;
c->num_glyphs = 0;
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ci++;
}
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clusters[ci].num_glyphs++;
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if (clusters[ci].base_char + clusters[ci].num_chars < after + 1)
clusters[ci].num_chars = after + 1 - clusters[ci].base_char;
}
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ci++;
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buffer->clear_output();
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for (unsigned int i = 0; i < ci; ++i)
buffer->replace_glyphs (clusters[i].num_chars, clusters[i].num_glyphs, gids + clusters[i].base_glyph);
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buffer->swap_buffers();
hb_glyph_position_t *pPos;
for (pPos = hb_buffer_get_glyph_positions(buffer, NULL), is = gr_seg_first_slot(seg);
is; pPos++, is = gr_slot_next_in_segment(is))
{
pPos->x_offset = gr_slot_origin_X(is) - curradvx;
pPos->y_offset = gr_slot_origin_Y(is) - curradvy;
pPos->x_advance = gr_slot_advance_X(is, data->grface, data->grfont);
pPos->y_advance = gr_slot_advance_Y(is, data->grface, data->grfont);
// if (pPos->x_advance < 0 && gr_slot_attached_to(is))
// pPos->x_advance = 0;
curradvx += pPos->x_advance;
curradvy += pPos->y_advance;
}
pPos[-1].x_advance += gr_seg_advance_X(seg) - curradvx;
success = 1;
dieout:
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if (gids) free (gids);
if (clusters) free (clusters);
if (seg) gr_seg_destroy (seg);
if (text) free (text);
return success;
}