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439 lines
15 KiB
C
439 lines
15 KiB
C
/*
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* Glyph shaping support
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*
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* Copyright 2010 Aric Stewart for CodeWeavers
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* Copyright 2014 Nikolay Sivov for CodeWeavers
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*
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*
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* Shaping features processing, default features, and lookups handling logic are
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* derived from HarfBuzz implementation. Consult project documentation for the full
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* list of its authors.
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*/
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#define COBJMACROS
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#include "dwrite_private.h"
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#include "scripts.h"
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#include "winternl.h"
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#include "wine/debug.h"
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WINE_DEFAULT_DEBUG_CHANNEL(dwrite);
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#ifdef WORDS_BIGENDIAN
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#define GET_BE_DWORD(x) (x)
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#else
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#define GET_BE_DWORD(x) RtlUlongByteSwap(x)
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#endif
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struct scriptshaping_cache *create_scriptshaping_cache(void *context, const struct shaping_font_ops *font_ops)
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{
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struct scriptshaping_cache *cache;
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if (!(cache = calloc(1, sizeof(*cache))))
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return NULL;
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cache->font = font_ops;
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cache->context = context;
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opentype_layout_scriptshaping_cache_init(cache);
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cache->upem = cache->font->get_font_upem(cache->context);
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return cache;
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}
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void release_scriptshaping_cache(struct scriptshaping_cache *cache)
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{
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if (!cache)
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return;
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cache->font->release_font_table(cache->context, cache->gdef.table.context);
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cache->font->release_font_table(cache->context, cache->gsub.table.context);
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cache->font->release_font_table(cache->context, cache->gpos.table.context);
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free(cache);
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}
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static unsigned int shape_select_script(const struct scriptshaping_cache *cache, DWORD kind, const unsigned int *scripts,
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unsigned int *script_index)
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{
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static const unsigned int fallback_scripts[] =
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{
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DWRITE_MAKE_OPENTYPE_TAG('D','F','L','T'),
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DWRITE_MAKE_OPENTYPE_TAG('d','f','l','t'),
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DWRITE_MAKE_OPENTYPE_TAG('l','a','t','n'),
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0,
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};
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unsigned int script;
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/* Passed scripts in ascending priority. */
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while (scripts && *scripts)
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{
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if ((script = opentype_layout_find_script(cache, kind, *scripts, script_index)))
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return script;
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scripts++;
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}
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/* 'DFLT' -> 'dflt' -> 'latn' */
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scripts = fallback_scripts;
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while (*scripts)
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{
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if ((script = opentype_layout_find_script(cache, kind, *scripts, script_index)))
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return script;
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scripts++;
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}
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return 0;
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}
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static DWORD shape_select_language(const struct scriptshaping_cache *cache, DWORD kind, unsigned int script_index,
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DWORD language, unsigned int *language_index)
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{
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/* Specified language -> 'dflt'. */
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if ((language = opentype_layout_find_language(cache, kind, language, script_index, language_index)))
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return language;
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if ((language = opentype_layout_find_language(cache, kind, DWRITE_MAKE_OPENTYPE_TAG('d','f','l','t'),
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script_index, language_index)))
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return language;
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return 0;
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}
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void shape_add_feature_full(struct shaping_features *features, unsigned int tag, unsigned int flags, unsigned int value)
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{
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unsigned int i = features->count;
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if (!dwrite_array_reserve((void **)&features->features, &features->capacity, features->count + 1,
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sizeof(*features->features)))
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return;
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features->features[i].tag = tag;
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features->features[i].flags = flags;
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features->features[i].max_value = value;
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features->features[i].default_value = flags & FEATURE_GLOBAL ? value : 0;
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features->features[i].stage = features->stage;
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features->count++;
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}
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static void shape_add_feature(struct shaping_features *features, unsigned int tag)
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{
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shape_add_feature_full(features, tag, FEATURE_GLOBAL, 1);
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}
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void shape_enable_feature(struct shaping_features *features, unsigned int tag,
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unsigned int flags)
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{
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shape_add_feature_full(features, tag, FEATURE_GLOBAL | flags, 1);
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}
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void shape_start_next_stage(struct shaping_features *features, stage_func func)
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{
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features->stages[features->stage].func = func;
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features->stage++;
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}
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static int __cdecl features_sorting_compare(const void *a, const void *b)
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{
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const struct shaping_feature *left = a, *right = b;
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return left->tag != right->tag ? (left->tag < right->tag ? -1 : 1) : 0;
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};
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static void shape_merge_features(struct scriptshaping_context *context, struct shaping_features *features)
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{
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const DWRITE_TYPOGRAPHIC_FEATURES **user_features = context->user_features.features;
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unsigned int i, j;
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/* For now only consider global, enabled user features. */
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if (user_features && context->user_features.range_lengths)
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{
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unsigned int flags = context->user_features.range_count == 1 &&
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context->user_features.range_lengths[0] == context->length ? FEATURE_GLOBAL : 0;
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for (i = 0; i < context->user_features.range_count; ++i)
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{
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for (j = 0; j < user_features[i]->featureCount; ++j)
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shape_add_feature_full(features, user_features[i]->features[j].nameTag, flags,
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user_features[i]->features[j].parameter);
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}
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}
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/* Sort and merge duplicates. */
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qsort(features->features, features->count, sizeof(*features->features), features_sorting_compare);
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for (i = 1, j = 0; i < features->count; ++i)
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{
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if (features->features[i].tag != features->features[j].tag)
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features->features[++j] = features->features[i];
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else
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{
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if (features->features[i].flags & FEATURE_GLOBAL)
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{
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features->features[j].flags |= FEATURE_GLOBAL;
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features->features[j].max_value = features->features[i].max_value;
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features->features[j].default_value = features->features[i].default_value;
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}
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else
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{
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if (features->features[j].flags & FEATURE_GLOBAL)
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features->features[j].flags ^= FEATURE_GLOBAL;
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features->features[j].max_value = max(features->features[j].max_value, features->features[i].max_value);
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}
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features->features[j].flags |= features->features[i].flags & FEATURE_HAS_FALLBACK;
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features->features[j].stage = min(features->features[j].stage, features->features[i].stage);
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}
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}
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features->count = j + 1;
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}
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static void default_shaper_setup_masks(struct scriptshaping_context *context,
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const struct shaping_features *features)
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{
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unsigned int i;
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for (i = 0; i < context->glyph_count; ++i)
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{
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context->u.buffer.glyph_props[i].justification = iswspace(context->glyph_infos[i].codepoint) ?
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SCRIPT_JUSTIFY_BLANK : SCRIPT_JUSTIFY_CHARACTER;
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}
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}
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static const struct shaper default_shaper =
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{
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.setup_masks = default_shaper_setup_masks
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};
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static void shape_set_shaper(struct scriptshaping_context *context)
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{
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switch (context->script)
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{
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case Script_Arabic:
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case Script_Syriac:
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context->shaper = &arabic_shaper;
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break;
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default:
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context->shaper = &default_shaper;
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}
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}
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HRESULT shape_get_positions(struct scriptshaping_context *context, const unsigned int *scripts)
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{
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static const struct shaping_feature common_features[] =
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{
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{ DWRITE_MAKE_OPENTYPE_TAG('a','b','v','m') },
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{ DWRITE_MAKE_OPENTYPE_TAG('b','l','w','m') },
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{ DWRITE_MAKE_OPENTYPE_TAG('m','a','r','k'), FEATURE_MANUAL_JOINERS },
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{ DWRITE_MAKE_OPENTYPE_TAG('m','k','m','k'), FEATURE_MANUAL_JOINERS },
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};
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static const unsigned int horizontal_features[] =
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{
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DWRITE_MAKE_OPENTYPE_TAG('c','u','r','s'),
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DWRITE_MAKE_OPENTYPE_TAG('d','i','s','t'),
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DWRITE_MAKE_OPENTYPE_TAG('k','e','r','n'),
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};
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struct scriptshaping_cache *cache = context->cache;
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unsigned int script_index, language_index, script, i;
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struct shaping_features features = { 0 };
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shape_set_shaper(context);
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for (i = 0; i < ARRAY_SIZE(common_features); ++i)
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shape_add_feature_full(&features, common_features[i].tag, FEATURE_GLOBAL | common_features[i].flags, 1);
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/* Horizontal features */
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if (!context->is_sideways)
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{
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for (i = 0; i < ARRAY_SIZE(horizontal_features); ++i)
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shape_add_feature(&features, horizontal_features[i]);
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}
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shape_merge_features(context, &features);
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/* Resolve script tag to actually supported script. */
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if (cache->gpos.table.data)
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{
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if ((script = shape_select_script(cache, MS_GPOS_TAG, scripts, &script_index)))
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{
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DWORD language = context->language_tag;
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if ((language = shape_select_language(cache, MS_GPOS_TAG, script_index, language, &language_index)))
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{
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TRACE("script %s, language %s.\n", debugstr_tag(script), language != ~0u ?
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debugstr_tag(language) : "deflangsys");
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opentype_layout_apply_gpos_features(context, script_index, language_index, &features);
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}
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}
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}
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for (i = 0; i < context->glyph_count; ++i)
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if (context->u.pos.glyph_props[i].isZeroWidthSpace)
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context->advances[i] = 0.0f;
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free(features.features);
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return S_OK;
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}
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static unsigned int shape_get_script_lang_index(struct scriptshaping_context *context, const unsigned int *scripts,
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unsigned int table, unsigned int *script_index, unsigned int *language_index)
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{
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unsigned int script;
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/* Resolve script tag to actually supported script. */
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if ((script = shape_select_script(context->cache, table, scripts, script_index)))
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{
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unsigned int language = context->language_tag;
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if ((language = shape_select_language(context->cache, table, *script_index, language, language_index)))
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return script;
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}
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return 0;
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}
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HRESULT shape_get_glyphs(struct scriptshaping_context *context, const unsigned int *scripts)
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{
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static const unsigned int common_features[] =
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{
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DWRITE_MAKE_OPENTYPE_TAG('c','c','m','p'),
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DWRITE_MAKE_OPENTYPE_TAG('l','o','c','l'),
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DWRITE_MAKE_OPENTYPE_TAG('r','l','i','g'),
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};
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static const unsigned int horizontal_features[] =
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{
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DWRITE_MAKE_OPENTYPE_TAG('c','a','l','t'),
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DWRITE_MAKE_OPENTYPE_TAG('c','l','i','g'),
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DWRITE_MAKE_OPENTYPE_TAG('l','i','g','a'),
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DWRITE_MAKE_OPENTYPE_TAG('r','c','l','t'),
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};
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unsigned int script_index, language_index;
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struct shaping_features features = { 0 };
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unsigned int i;
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shape_set_shaper(context);
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if (!context->is_sideways)
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{
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if (context->is_rtl)
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{
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shape_enable_feature(&features, DWRITE_MAKE_OPENTYPE_TAG('r','t','l','a'), 0);
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shape_add_feature_full(&features, DWRITE_MAKE_OPENTYPE_TAG('r','t','l','m'), 0, 1);
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}
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else
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{
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shape_enable_feature(&features, DWRITE_MAKE_OPENTYPE_TAG('l','t','r','a'), 0);
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shape_enable_feature(&features, DWRITE_MAKE_OPENTYPE_TAG('l','t','r','m'), 0);
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}
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}
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if (context->shaper->collect_features)
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context->shaper->collect_features(context, &features);
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for (i = 0; i < ARRAY_SIZE(common_features); ++i)
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shape_add_feature(&features, common_features[i]);
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/* Horizontal features */
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if (!context->is_sideways)
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{
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for (i = 0; i < ARRAY_SIZE(horizontal_features); ++i)
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shape_add_feature(&features, horizontal_features[i]);
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}
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else
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shape_enable_feature(&features, DWRITE_MAKE_OPENTYPE_TAG('v','e','r','t'), FEATURE_GLOBAL_SEARCH);
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shape_merge_features(context, &features);
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/* Resolve script tag to actually supported script. */
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shape_get_script_lang_index(context, scripts, MS_GSUB_TAG, &script_index, &language_index);
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opentype_layout_apply_gsub_features(context, script_index, language_index, &features);
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free(features.features);
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return (context->glyph_count <= context->u.subst.max_glyph_count) ? S_OK : E_NOT_SUFFICIENT_BUFFER;
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}
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static int __cdecl tag_array_sorting_compare(const void *a, const void *b)
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{
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unsigned int left = GET_BE_DWORD(*(unsigned int *)a), right = GET_BE_DWORD(*(unsigned int *)b);
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return left != right ? (left < right ? -1 : 1) : 0;
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};
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HRESULT shape_get_typographic_features(struct scriptshaping_context *context, const unsigned int *scripts,
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unsigned int max_tagcount, unsigned int *actual_tagcount, unsigned int *tags)
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{
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unsigned int i, j, script_index, language_index;
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struct tag_array t = { 0 };
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/* Collect from both tables, sort and remove duplicates. */
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shape_get_script_lang_index(context, scripts, MS_GSUB_TAG, &script_index, &language_index);
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opentype_get_typographic_features(&context->cache->gsub, script_index, language_index, &t);
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shape_get_script_lang_index(context, scripts, MS_GPOS_TAG, &script_index, &language_index);
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opentype_get_typographic_features(&context->cache->gpos, script_index, language_index, &t);
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if (t.count == 0)
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{
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*actual_tagcount = 0;
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return S_OK;
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}
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/* Sort and remove duplicates. */
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qsort(t.tags, t.count, sizeof(*t.tags), tag_array_sorting_compare);
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for (i = 1, j = 0; i < t.count; ++i)
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{
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if (t.tags[i] != t.tags[j])
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t.tags[++j] = t.tags[i];
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}
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t.count = j + 1;
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if (t.count <= max_tagcount)
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memcpy(tags, t.tags, t.count * sizeof(*t.tags));
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*actual_tagcount = t.count;
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free(t.tags);
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return t.count <= max_tagcount ? S_OK : E_NOT_SUFFICIENT_BUFFER;
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}
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HRESULT shape_check_typographic_feature(struct scriptshaping_context *context, const unsigned int *scripts,
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unsigned int tag, unsigned int glyph_count, const UINT16 *glyphs, UINT8 *feature_applies)
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{
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static const unsigned int tables[] = { MS_GSUB_TAG, MS_GPOS_TAG };
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struct shaping_feature feature = { .tag = tag };
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unsigned int script_index, language_index;
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unsigned int i;
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memset(feature_applies, 0, glyph_count * sizeof(*feature_applies));
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for (i = 0; i < ARRAY_SIZE(tables); ++i)
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{
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shape_get_script_lang_index(context, scripts, tables[i], &script_index, &language_index);
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context->table = tables[i] == MS_GSUB_TAG ? &context->cache->gsub : &context->cache->gpos;
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/* Skip second table if feature applies to all. */
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if (opentype_layout_check_feature(context, script_index, language_index, &feature, glyph_count,
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glyphs, feature_applies))
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{
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break;
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}
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}
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return S_OK;
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}
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