diff options
Diffstat (limited to 'Build/source/libs/harfbuzz/harfbuzz-0.9.20/src/hb-graphite2.cc')
-rw-r--r-- | Build/source/libs/harfbuzz/harfbuzz-0.9.20/src/hb-graphite2.cc | 370 |
1 files changed, 370 insertions, 0 deletions
diff --git a/Build/source/libs/harfbuzz/harfbuzz-0.9.20/src/hb-graphite2.cc b/Build/source/libs/harfbuzz/harfbuzz-0.9.20/src/hb-graphite2.cc new file mode 100644 index 00000000000..cce860694cc --- /dev/null +++ b/Build/source/libs/harfbuzz/harfbuzz-0.9.20/src/hb-graphite2.cc @@ -0,0 +1,370 @@ +/* + * 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 +#define hb_graphite2_shaper_font_data_t gr_font +#include "hb-shaper-impl-private.hh" + +#include <graphite2/Font.h> +#include <graphite2/Segment.h> + +#include "hb-graphite2.h" + +#include "hb-ot-tag.h" + + +HB_SHAPER_DATA_ENSURE_DECLARE(graphite2, face) +HB_SHAPER_DATA_ENSURE_DECLARE(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)) + hb_blob_destroy (silf_blob); + + 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); +} + +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 + */ + +static float hb_graphite2_get_advance (const void *hb_font, unsigned short gid) +{ + return ((hb_font_t *) hb_font)->get_glyph_h_advance (gid); +} + +hb_graphite2_shaper_font_data_t * +_hb_graphite2_shaper_font_data_create (hb_font_t *font) +{ + if (unlikely (!hb_graphite2_shaper_face_data_ensure (font->face))) return NULL; + + hb_face_t *face = font->face; + hb_graphite2_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face); + + return gr_make_font_with_advance_fn (font->x_scale, font, &hb_graphite2_get_advance, face_data->grface); +} + +void +_hb_graphite2_shaper_font_data_destroy (hb_graphite2_shaper_font_data_t *data) +{ + gr_font_destroy (data); +} + +gr_font * +hb_graphite2_font_get_gr_font (hb_font_t *font) +{ + if (unlikely (!hb_graphite2_shaper_font_data_ensure (font))) return NULL; + return HB_SHAPER_DATA_GET (font); +} + + +/* + * 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) +{ + 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; +}; + +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; + gr_font *grfont = HB_SHAPER_DATA_GET (font); + + 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); + + while (num_features--) + { + const gr_feature_ref *fref = gr_face_find_fref (grface, features->tag); + if (fref) + gr_fref_set_feature_value (fref, features->value, feats); + features++; + } + + gr_segment *seg = NULL; + const gr_slot *is; + unsigned int ci = 0, ic = 0; + float curradvx = 0., curradvy = 0.; + + unsigned int scratch_size; + char *scratch = (char *) buffer->get_scratch_buffer (&scratch_size); + +#define ALLOCATE_ARRAY(Type, name, len) \ + Type *name = (Type *) scratch; \ + scratch += (len) * sizeof ((name)[0]); \ + scratch_size -= (len) * sizeof ((name)[0]); + + ALLOCATE_ARRAY (uint32_t, chars, buffer->len); + + for (unsigned int i = 0; i < buffer->len; ++i) + chars[i] = buffer->info[i].codepoint; + + 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 (grfont, 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); + return false; + } + + scratch = (char *) buffer->get_scratch_buffer (&scratch_size); + while ((sizeof (hb_graphite2_cluster_t) * buffer->len + + sizeof (hb_codepoint_t) * glyph_count) > scratch_size) + { + buffer->ensure (buffer->allocated * 2); + if (unlikely (buffer->in_error)) { + if (feats) gr_featureval_destroy (feats); + gr_seg_destroy (seg); + return false; + } + scratch = (char *) buffer->get_scratch_buffer (&scratch_size); + } + + ALLOCATE_ARRAY (hb_graphite2_cluster_t, clusters, buffer->len); + ALLOCATE_ARRAY (hb_codepoint_t, gids, glyph_count); + + memset (clusters, 0, sizeof (clusters[0]) * buffer->len); + + hb_codepoint_t *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) + { + clusters[ci-1].num_chars += clusters[ci].num_chars; + clusters[ci-1].num_glyphs += clusters[ci].num_glyphs; + 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->num_chars = before - c->base_char; + c->base_glyph = ic; + c->num_glyphs = 0; + ci++; + } + 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; + } + ci++; + + //buffer->clear_output (); + 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 = gr_cinfo_base(gr_seg_cinfo(seg, clusters[i].base_char)); + } + } + buffer->len = glyph_count; + //buffer->swap_buffers (); + + if (HB_DIRECTION_IS_BACKWARD(buffer->props.direction)) + curradvx = gr_seg_advance_X(seg); + + 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, grface, grfont); + pPos->y_advance = gr_slot_advance_Y (is, grface, grfont); + if (HB_DIRECTION_IS_BACKWARD (buffer->props.direction)) + curradvx -= pPos->x_advance; + pPos->x_offset = gr_slot_origin_X (is) - curradvx; + if (!HB_DIRECTION_IS_BACKWARD (buffer->props.direction)) + curradvx += pPos->x_advance; + pPos->y_offset = gr_slot_origin_Y (is) - curradvy; + curradvy += pPos->y_advance; + } + if (!HB_DIRECTION_IS_BACKWARD (buffer->props.direction)) + pPos[-1].x_advance += gr_seg_advance_X(seg) - curradvx; + + if (HB_DIRECTION_IS_BACKWARD (buffer->props.direction)) + hb_buffer_reverse_clusters (buffer); + + if (feats) gr_featureval_destroy (feats); + gr_seg_destroy (seg); + + return true; +} |