/*
* Copyright © 2011 Martin Hosken
* Copyright © 2011 SIL International
* Copyright © 2011,2012 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.
*
* Google Author(s): Behdad Esfahbod
*/
#define HB_SHAPER graphite2
#include "hb-shaper-impl-private.hh"
#include "hb-graphite2.h"
#include <graphite2/Segment.h>
HB_SHAPER_DATA_ENSURE_DEFINE(graphite2, face)
HB_SHAPER_DATA_ENSURE_DEFINE(graphite2, font)
/*
* shaper face data
*/
typedef struct hb_graphite2_tablelist_t {
struct hb_graphite2_tablelist_t *next;
hb_blob_t *blob;
unsigned int tag;
} hb_graphite2_tablelist_t;
struct hb_graphite2_shaper_face_data_t {
hb_face_t *face;
gr_face *grface;
hb_graphite2_tablelist_t *tlist;
};
static const void *hb_graphite2_get_table (const void *data, unsigned int tag, size_t *len)
{
hb_graphite2_shaper_face_data_t *face_data = (hb_graphite2_shaper_face_data_t *) data;
hb_graphite2_tablelist_t *tlist = face_data->tlist;
hb_blob_t *blob = NULL;
for (hb_graphite2_tablelist_t *p = tlist; p; p = p->next)
if (p->tag == tag) {
blob = p->blob;
break;
}
if (unlikely (!blob))
{
blob = face_data->face->reference_table (tag);
hb_graphite2_tablelist_t *p = (hb_graphite2_tablelist_t *) calloc (1, sizeof (hb_graphite2_tablelist_t));
if (unlikely (!p)) {
hb_blob_destroy (blob);
return NULL;
}
p->blob = blob;
p->tag = tag;
/* TODO Not thread-safe, but fairly harmless.
* We can do the double-chcked pointer cmpexch thing here. */
p->next = face_data->tlist;
face_data->tlist = p;
}
unsigned int tlen;
const char *d = hb_blob_get_data (blob, &tlen);
*len = tlen;
return d;
}
hb_graphite2_shaper_face_data_t *
_hb_graphite2_shaper_face_data_create (hb_face_t *face)
{
hb_blob_t *silf_blob = face->reference_table (HB_GRAPHITE2_TAG_SILF);
/* Umm, we just reference the table to check whether it exists.
* Maybe add better API for this? */
if (!hb_blob_get_length (silf_blob))
{
hb_blob_destroy (silf_blob);
return NULL;
}
hb_blob_destroy (silf_blob);
hb_graphite2_shaper_face_data_t *data = (hb_graphite2_shaper_face_data_t *) calloc (1, sizeof (hb_graphite2_shaper_face_data_t));
if (unlikely (!data))
return NULL;
data->face = face;
data->grface = gr_make_face (data, &hb_graphite2_get_table, gr_face_preloadAll);
if (unlikely (!data->grface)) {
free (data);
return NULL;
}
return data;
}
void
_hb_graphite2_shaper_face_data_destroy (hb_graphite2_shaper_face_data_t *data)
{
hb_graphite2_tablelist_t *tlist = data->tlist;
while (tlist)
{
hb_graphite2_tablelist_t *old = tlist;
hb_blob_destroy (tlist->blob);
tlist = tlist->next;
free (old);
}
gr_face_destroy (data->grface);
free (data);
}
/*
* Since: 0.9.10
*/
gr_face *
hb_graphite2_face_get_gr_face (hb_face_t *face)
{
if (unlikely (!hb_graphite2_shaper_face_data_ensure (face))) return NULL;
return HB_SHAPER_DATA_GET (face)->grface;
}
/*
* shaper font data
*/
struct hb_graphite2_shaper_font_data_t {};
hb_graphite2_shaper_font_data_t *
_hb_graphite2_shaper_font_data_create (hb_font_t *font HB_UNUSED)
{
return (hb_graphite2_shaper_font_data_t *) HB_SHAPER_DATA_SUCCEEDED;
}
void
_hb_graphite2_shaper_font_data_destroy (hb_graphite2_shaper_font_data_t *data HB_UNUSED)
{
}
/*
* Since: 0.9.10
*/
gr_font *
hb_graphite2_font_get_gr_font (hb_font_t *font)
{
return NULL;
}
/*
* shaper shape_plan data
*/
struct hb_graphite2_shaper_shape_plan_data_t {};
hb_graphite2_shaper_shape_plan_data_t *
_hb_graphite2_shaper_shape_plan_data_create (hb_shape_plan_t *shape_plan HB_UNUSED,
const hb_feature_t *user_features HB_UNUSED,
unsigned int num_user_features HB_UNUSED,
const int *coords HB_UNUSED,
unsigned int num_coords HB_UNUSED)
{
return (hb_graphite2_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED;
}
void
_hb_graphite2_shaper_shape_plan_data_destroy (hb_graphite2_shaper_shape_plan_data_t *data HB_UNUSED)
{
}
/*
* shaper
*/
struct hb_graphite2_cluster_t {
unsigned int base_char;
unsigned int num_chars;
unsigned int base_glyph;
unsigned int num_glyphs;
unsigned int cluster;
float advance;
};
hb_bool_t
_hb_graphite2_shape (hb_shape_plan_t *shape_plan,
hb_font_t *font,
hb_buffer_t *buffer,
const hb_feature_t *features,
unsigned int num_features)
{
hb_face_t *face = font->face;
gr_face *grface = HB_SHAPER_DATA_GET (face)->grface;
const char *lang = hb_language_to_string (hb_buffer_get_language (buffer));
const char *lang_end = lang ? strchr (lang, '-') : NULL;
int lang_len = lang_end ? lang_end - lang : -1;
gr_feature_val *feats = gr_face_featureval_for_lang (grface, lang ? hb_tag_from_string (lang, lang_len) : 0);
for (unsigned int i = 0; i < num_features; i++)
{
const gr_feature_ref *fref = gr_face_find_fref (grface, features[i].tag);
if (fref)
gr_fref_set_feature_value (fref, features[i].value, feats);
}
gr_segment *seg = NULL;
const gr_slot *is;
unsigned int ci = 0, ic = 0;
float curradvx = 0., curradvy = 0.;
unsigned int scratch_size;
hb_buffer_t::scratch_buffer_t *scratch = buffer->get_scratch_buffer (&scratch_size);
uint32_t *chars = (uint32_t *) scratch;
for (unsigned int i = 0; i < buffer->len; ++i)
chars[i] = buffer->info[i].codepoint;
/* TODO ensure_native_direction. */
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 (NULL, grface,
script_tag[1] == HB_TAG_NONE ? script_tag[0] : script_tag[1],
feats,
gr_utf32, chars, buffer->len,
2 | (hb_buffer_get_direction (buffer) == HB_DIRECTION_RTL ? 1 : 0));
if (unlikely (!seg)) {
if (feats) gr_featureval_destroy (feats);
return false;
}
unsigned int glyph_count = gr_seg_n_slots (seg);
if (unlikely (!glyph_count)) {
if (feats) gr_featureval_destroy (feats);
gr_seg_destroy (seg);
buffer->len = 0;
return true;
}
buffer->ensure (glyph_count);
scratch = buffer->get_scratch_buffer (&scratch_size);
while ((DIV_CEIL (sizeof (hb_graphite2_cluster_t) * buffer->len, sizeof (*scratch)) +
DIV_CEIL (sizeof (hb_codepoint_t) * glyph_count, sizeof (*scratch))) > scratch_size)
{
if (unlikely (!buffer->ensure (buffer->allocated * 2)))
{
if (feats) gr_featureval_destroy (feats);
gr_seg_destroy (seg);
return false;
}
scratch = buffer->get_scratch_buffer (&scratch_size);
}
#define ALLOCATE_ARRAY(Type, name, len) \
Type *name = (Type *) scratch; \
{ \
unsigned int _consumed = DIV_CEIL ((len) * sizeof (Type), sizeof (*scratch)); \
assert (_consumed <= scratch_size); \
scratch += _consumed; \
scratch_size -= _consumed; \
}
ALLOCATE_ARRAY (hb_graphite2_cluster_t, clusters, buffer->len);
ALLOCATE_ARRAY (hb_codepoint_t, gids, glyph_count);
#undef ALLOCATE_ARRAY
memset (clusters, 0, sizeof (clusters[0]) * buffer->len);
hb_codepoint_t *pg = gids;
clusters[0].cluster = buffer->info[0].cluster;
float curradv = 0.;
if (HB_DIRECTION_IS_BACKWARD(buffer->props.direction))
{
curradv = gr_slot_origin_X(gr_seg_first_slot(seg));
clusters[0].advance = gr_seg_advance_X(seg) - curradv;
}
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)
{
clusters[ci-1].num_chars += clusters[ci].num_chars;
clusters[ci-1].num_glyphs += clusters[ci].num_glyphs;
clusters[ci-1].advance += clusters[ci].advance;
ci--;
}
if (gr_slot_can_insert_before (is) && clusters[ci].num_chars && before >= clusters[ci].base_char + clusters[ci].num_chars)
{
hb_graphite2_cluster_t *c = clusters + ci + 1;
c->base_char = clusters[ci].base_char + clusters[ci].num_chars;
c->cluster = buffer->info[c->base_char].cluster;
c->num_chars = before - c->base_char;
c->base_glyph = ic;
c->num_glyphs = 0;
if (HB_DIRECTION_IS_BACKWARD(buffer->props.direction))
c->advance = curradv - gr_slot_origin_X(is);
else
clusters[ci].advance = gr_slot_origin_X(is) - curradv;
ci++;
curradv = gr_slot_origin_X(is);
}
clusters[ci].num_glyphs++;
if (clusters[ci].base_char + clusters[ci].num_chars < after + 1)
clusters[ci].num_chars = after + 1 - clusters[ci].base_char;
}
if (HB_DIRECTION_IS_BACKWARD(buffer->props.direction))
clusters[ci].advance += curradv;
else
clusters[ci].advance = gr_seg_advance_X(seg) - curradv;
ci++;
for (unsigned int i = 0; i < ci; ++i)
{
for (unsigned int j = 0; j < clusters[i].num_glyphs; ++j)
{
hb_glyph_info_t *info = &buffer->info[clusters[i].base_glyph + j];
info->codepoint = gids[clusters[i].base_glyph + j];
info->cluster = clusters[i].cluster;
info->var1.i32 = clusters[i].advance; // all glyphs in the cluster get the same advance
}
}
buffer->len = glyph_count;
unsigned int upem = hb_face_get_upem (face);
float xscale = (float) font->x_scale / upem;
float yscale = (float) font->y_scale / upem;
yscale *= yscale / xscale;
/* Positioning. */
int currclus = -1;
const hb_glyph_info_t *info = buffer->info;
hb_glyph_position_t *pPos = hb_buffer_get_glyph_positions (buffer, NULL);
if (!HB_DIRECTION_IS_BACKWARD(buffer->props.direction))
{
curradvx = 0;
for (is = gr_seg_first_slot (seg); is; pPos++, ++info, is = gr_slot_next_in_segment (is))
{
pPos->x_offset = gr_slot_origin_X (is) * xscale - curradvx;
pPos->y_offset = gr_slot_origin_Y (is) * yscale - curradvy;
if (info->cluster != currclus) {
pPos->x_advance = info->var1.i32 * xscale;
curradvx += pPos->x_advance;
currclus = info->cluster;
} else
pPos->x_advance = 0.;
pPos->y_advance = gr_slot_advance_Y (is, grface, NULL) * yscale;
curradvy += pPos->y_advance;
}
}
else
{
curradvx = gr_seg_advance_X(seg);
for (is = gr_seg_first_slot (seg); is; pPos++, info++, is = gr_slot_next_in_segment (is))
{
if (info->cluster != currclus)
{
pPos->x_advance = info->var1.i32 * xscale;
curradvx -= pPos->x_advance;
currclus = info->cluster;
} else
pPos->x_advance = 0.;
pPos->y_advance = gr_slot_advance_Y (is, grface, NULL) * yscale;
curradvy -= pPos->y_advance;
pPos->x_offset = (gr_slot_origin_X (is) - info->var1.i32) * xscale - curradvx + pPos->x_advance;
pPos->y_offset = gr_slot_origin_Y (is) * yscale - curradvy;
}
hb_buffer_reverse_clusters (buffer);
}
if (feats) gr_featureval_destroy (feats);
gr_seg_destroy (seg);
return true;
}