1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/harfbuzz/src/hb-icu-le.cc Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,215 @@
1.4 +/*
1.5 + * Copyright © 2012 Google, Inc.
1.6 + *
1.7 + * This is part of HarfBuzz, a text shaping library.
1.8 + *
1.9 + * Permission is hereby granted, without written agreement and without
1.10 + * license or royalty fees, to use, copy, modify, and distribute this
1.11 + * software and its documentation for any purpose, provided that the
1.12 + * above copyright notice and the following two paragraphs appear in
1.13 + * all copies of this software.
1.14 + *
1.15 + * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
1.16 + * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
1.17 + * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
1.18 + * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
1.19 + * DAMAGE.
1.20 + *
1.21 + * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
1.22 + * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
1.23 + * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
1.24 + * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
1.25 + * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
1.26 + *
1.27 + * Google Author(s): Behdad Esfahbod
1.28 + */
1.29 +
1.30 +#define HB_SHAPER icu_le
1.31 +#define hb_icu_le_shaper_font_data_t PortableFontInstance
1.32 +#include "hb-shaper-impl-private.hh"
1.33 +
1.34 +#include "hb-icu-le/PortableFontInstance.h"
1.35 +
1.36 +#include "layout/loengine.h"
1.37 +#include "unicode/unistr.h"
1.38 +
1.39 +#include "hb-icu.h"
1.40 +
1.41 +
1.42 +/*
1.43 + * shaper face data
1.44 + */
1.45 +
1.46 +struct hb_icu_le_shaper_face_data_t {};
1.47 +
1.48 +hb_icu_le_shaper_face_data_t *
1.49 +_hb_icu_le_shaper_face_data_create (hb_face_t *face HB_UNUSED)
1.50 +{
1.51 + return (hb_icu_le_shaper_face_data_t *) HB_SHAPER_DATA_SUCCEEDED;
1.52 +}
1.53 +
1.54 +void
1.55 +_hb_icu_le_shaper_face_data_destroy (hb_icu_le_shaper_face_data_t *data HB_UNUSED)
1.56 +{
1.57 +}
1.58 +
1.59 +
1.60 +/*
1.61 + * shaper font data
1.62 + */
1.63 +
1.64 +hb_icu_le_shaper_font_data_t *
1.65 +_hb_icu_le_shaper_font_data_create (hb_font_t *font)
1.66 +{
1.67 + LEErrorCode status = LE_NO_ERROR;
1.68 + hb_icu_le_shaper_font_data_t *data = new PortableFontInstance (font->face,
1.69 + font->x_scale,
1.70 + font->y_scale,
1.71 + status);
1.72 + if (status != LE_NO_ERROR) {
1.73 + delete (data);
1.74 + return NULL;
1.75 + }
1.76 +
1.77 + return data;
1.78 +}
1.79 +
1.80 +void
1.81 +_hb_icu_le_shaper_font_data_destroy (hb_icu_le_shaper_font_data_t *data)
1.82 +{
1.83 + delete (data);
1.84 +}
1.85 +
1.86 +
1.87 +/*
1.88 + * shaper shape_plan data
1.89 + */
1.90 +
1.91 +struct hb_icu_le_shaper_shape_plan_data_t {};
1.92 +
1.93 +hb_icu_le_shaper_shape_plan_data_t *
1.94 +_hb_icu_le_shaper_shape_plan_data_create (hb_shape_plan_t *shape_plan HB_UNUSED,
1.95 + const hb_feature_t *user_features,
1.96 + unsigned int num_user_features)
1.97 +{
1.98 + return (hb_icu_le_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED;
1.99 +}
1.100 +
1.101 +void
1.102 +_hb_icu_le_shaper_shape_plan_data_destroy (hb_icu_le_shaper_shape_plan_data_t *data)
1.103 +{
1.104 +}
1.105 +
1.106 +
1.107 +/*
1.108 + * shaper
1.109 + */
1.110 +
1.111 +hb_bool_t
1.112 +_hb_icu_le_shape (hb_shape_plan_t *shape_plan,
1.113 + hb_font_t *font,
1.114 + hb_buffer_t *buffer,
1.115 + const hb_feature_t *features,
1.116 + unsigned int num_features)
1.117 +{
1.118 + LEFontInstance *font_instance = HB_SHAPER_DATA_GET (font);
1.119 + le_int32 script_code = hb_icu_script_from_script (shape_plan->props.script);
1.120 + le_int32 language_code = -1 /* TODO */;
1.121 + le_int32 typography_flags = 3; /* Needed for ligatures and kerning */
1.122 + LEErrorCode status = LE_NO_ERROR;
1.123 + le_engine *le = le_create ((const le_font *) font_instance,
1.124 + script_code,
1.125 + language_code,
1.126 + typography_flags,
1.127 + &status);
1.128 + if (status != LE_NO_ERROR)
1.129 + { le_close (le); return false; }
1.130 +
1.131 +retry:
1.132 +
1.133 + unsigned int scratch_size;
1.134 + char *scratch = (char *) buffer->get_scratch_buffer (&scratch_size);
1.135 +
1.136 +#define ALLOCATE_ARRAY(Type, name, len) \
1.137 + Type *name = (Type *) scratch; \
1.138 + scratch += (len) * sizeof ((name)[0]); \
1.139 + scratch_size -= (len) * sizeof ((name)[0]);
1.140 +
1.141 + ALLOCATE_ARRAY (LEUnicode, chars, buffer->len);
1.142 + ALLOCATE_ARRAY (unsigned int, clusters, buffer->len);
1.143 +
1.144 + /* XXX Use UTF-16 decoder! */
1.145 + for (unsigned int i = 0; i < buffer->len; i++) {
1.146 + chars[i] = buffer->info[i].codepoint;
1.147 + clusters[i] = buffer->info[i].cluster;
1.148 + }
1.149 +
1.150 + unsigned int glyph_count = le_layoutChars (le,
1.151 + chars,
1.152 + 0,
1.153 + buffer->len,
1.154 + buffer->len,
1.155 + HB_DIRECTION_IS_BACKWARD (buffer->props.direction),
1.156 + 0., 0.,
1.157 + &status);
1.158 + if (status != LE_NO_ERROR)
1.159 + { le_close (le); return false; }
1.160 +
1.161 + unsigned int num_glyphs = scratch_size / (sizeof (LEGlyphID) +
1.162 + sizeof (le_int32) +
1.163 + sizeof (float) * 2);
1.164 +
1.165 + if (unlikely (glyph_count >= num_glyphs || glyph_count > buffer->allocated)) {
1.166 + buffer->ensure (buffer->allocated * 2);
1.167 + if (buffer->in_error)
1.168 + { le_close (le); return false; }
1.169 + goto retry;
1.170 + }
1.171 +
1.172 + ALLOCATE_ARRAY (LEGlyphID, glyphs, glyph_count);
1.173 + ALLOCATE_ARRAY (le_int32, indices, glyph_count);
1.174 + ALLOCATE_ARRAY (float, positions, glyph_count * 2 + 2);
1.175 +
1.176 + le_getGlyphs (le, glyphs, &status);
1.177 + le_getCharIndices (le, indices, &status);
1.178 + le_getGlyphPositions (le, positions, &status);
1.179 +
1.180 +#undef ALLOCATE_ARRAY
1.181 +
1.182 + /* Ok, we've got everything we need, now compose output buffer,
1.183 + * very, *very*, carefully! */
1.184 +
1.185 + unsigned int j = 0;
1.186 + hb_glyph_info_t *info = buffer->info;
1.187 + for (unsigned int i = 0; i < glyph_count; i++)
1.188 + {
1.189 + if (glyphs[i] >= 0xFFFE)
1.190 + continue;
1.191 +
1.192 + info[j].codepoint = glyphs[i];
1.193 + info[j].cluster = clusters[indices[i]];
1.194 +
1.195 + /* icu-le doesn't seem to have separate advance values. */
1.196 + info[j].mask = positions[2 * i + 2] - positions[2 * i];
1.197 + info[j].var1.u32 = 0;
1.198 + info[j].var2.u32 = -positions[2 * i + 1];
1.199 +
1.200 + j++;
1.201 + }
1.202 + buffer->len = j;
1.203 +
1.204 + buffer->clear_positions ();
1.205 +
1.206 + for (unsigned int i = 0; i < buffer->len; i++) {
1.207 + hb_glyph_info_t *info = &buffer->info[i];
1.208 + hb_glyph_position_t *pos = &buffer->pos[i];
1.209 +
1.210 + /* TODO vertical */
1.211 + pos->x_advance = info->mask;
1.212 + pos->x_offset = info->var1.u32;
1.213 + pos->y_offset = info->var2.u32;
1.214 + }
1.215 +
1.216 + le_close (le);
1.217 + return true;
1.218 +}
