270 lines
8.0 KiB
C
270 lines
8.0 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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#define COBJMACROS
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#include "dwrite_private.h"
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#include "wine/debug.h"
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WINE_DEFAULT_DEBUG_CHANNEL(dwrite);
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#define MS_GPOS_TAG DWRITE_MAKE_OPENTYPE_TAG('G','P','O','S')
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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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cache = heap_alloc_zero(sizeof(*cache));
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if (!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->gpos.table.context);
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heap_free(cache);
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}
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static void shape_update_clusters_from_glyphprop(UINT32 glyphcount, UINT32 text_len, UINT16 *clustermap, DWRITE_SHAPING_GLYPH_PROPERTIES *glyph_props)
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{
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UINT32 i;
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for (i = 0; i < glyphcount; i++) {
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if (!glyph_props[i].isClusterStart) {
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UINT32 j;
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for (j = 0; j < text_len; j++) {
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if (clustermap[j] == i) {
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int k = j;
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while (k >= 0 && k < text_len && !glyph_props[clustermap[k]].isClusterStart)
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k--;
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if (k >= 0 && k < text_len && glyph_props[clustermap[k]].isClusterStart)
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clustermap[j] = clustermap[k];
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}
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}
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}
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}
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}
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static int compare_clustersearch(const void *a, const void* b)
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{
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UINT16 target = *(UINT16*)a;
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UINT16 index = *(UINT16*)b;
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int ret = 0;
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if (target > index)
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ret = 1;
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else if (target < index)
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ret = -1;
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return ret;
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}
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/* Maps given glyph position in glyph indices array to text index this glyph represents.
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Lowest possible index is returned.
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clustermap [I] Text index to index in glyph indices array map
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len [I] Clustermap size
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target [I] Index in glyph indices array to map
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*/
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static INT32 map_glyph_to_text_pos(const UINT16 *clustermap, UINT32 len, UINT16 target)
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{
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UINT16 *ptr;
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INT32 k;
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ptr = bsearch(&target, clustermap, len, sizeof(UINT16), compare_clustersearch);
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if (!ptr)
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return -1;
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/* get to the beginning */
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for (k = (ptr - clustermap) - 1; k >= 0 && clustermap[k] == target; k--)
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;
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k++;
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return k;
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}
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static HRESULT default_set_text_glyphs_props(struct scriptshaping_context *context, UINT16 *clustermap, UINT16 *glyph_indices,
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UINT32 glyphcount, DWRITE_SHAPING_TEXT_PROPERTIES *text_props, DWRITE_SHAPING_GLYPH_PROPERTIES *glyph_props)
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{
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UINT32 i;
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for (i = 0; i < glyphcount; i++) {
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UINT32 char_index[20];
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UINT32 char_count = 0;
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INT32 k;
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k = map_glyph_to_text_pos(clustermap, context->length, i);
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if (k >= 0) {
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for (; k < context->length && clustermap[k] == i; k++)
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char_index[char_count++] = k;
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}
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if (char_count == 0)
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continue;
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if (char_count == 1 && isspaceW(context->text[char_index[0]])) {
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glyph_props[i].justification = SCRIPT_JUSTIFY_BLANK;
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text_props[char_index[0]].isShapedAlone = context->text[char_index[0]] == ' ';
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}
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else
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glyph_props[i].justification = SCRIPT_JUSTIFY_CHARACTER;
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}
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/* FIXME: update properties using GDEF table */
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shape_update_clusters_from_glyphprop(glyphcount, context->length, clustermap, glyph_props);
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return S_OK;
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}
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static HRESULT latn_set_text_glyphs_props(struct scriptshaping_context *context, UINT16 *clustermap, UINT16 *glyph_indices,
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UINT32 glyphcount, DWRITE_SHAPING_TEXT_PROPERTIES *text_props, DWRITE_SHAPING_GLYPH_PROPERTIES *glyph_props)
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{
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HRESULT hr;
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UINT32 i;
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hr = default_set_text_glyphs_props(context, clustermap, glyph_indices, glyphcount, text_props, glyph_props);
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for (i = 0; i < glyphcount; i++)
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if (glyph_props[i].isZeroWidthSpace)
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glyph_props[i].justification = SCRIPT_JUSTIFY_NONE;
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return hr;
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}
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static const DWORD std_gpos_tags[] =
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{
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DWRITE_FONT_FEATURE_TAG_KERNING,
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DWRITE_FONT_FEATURE_TAG_MARK_POSITIONING,
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DWRITE_FONT_FEATURE_TAG_MARK_TO_MARK_POSITIONING,
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};
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static const struct shaping_features std_gpos_features =
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{
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std_gpos_tags,
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ARRAY_SIZE(std_gpos_tags),
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};
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const struct scriptshaping_ops latn_shaping_ops =
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{
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NULL,
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latn_set_text_glyphs_props,
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&std_gpos_features,
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};
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const struct scriptshaping_ops default_shaping_ops =
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{
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NULL,
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default_set_text_glyphs_props
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};
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static DWORD shape_select_script(const struct scriptshaping_cache *cache, DWORD kind, const DWORD *scripts,
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unsigned int *script_index)
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{
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static const DWORD 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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DWORD script;
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/* Passed scripts in ascending priority. */
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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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/* '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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HRESULT shape_get_positions(struct scriptshaping_context *context, const DWORD *scripts,
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const struct shaping_features *features)
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{
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struct scriptshaping_cache *cache = context->cache;
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unsigned int script_index, language_index;
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unsigned int i;
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DWORD script;
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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),
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language != ~0u ? 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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return S_OK;
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}
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