The Tor Browser: comparison gfx/harfbuzz/src/hb-graphite2.cc

--1:000000000000
+:78347afff5fb
+/*
+* 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 "hb-graphite2.h"
+#include <graphite2/Segment.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))
+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);
+}
+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;
+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;
+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 = 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)
+{
+buffer->ensure (buffer->allocated * 2);
+if (unlikely (buffer->in_error)) {
+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;
+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;
+}

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comparison: gfx/harfbuzz/src/hb-graphite2.cc

gfx/harfbuzz/src/hb-graphite2.cc