Sweden-Number/dlls/dwrite/shape.c

270 lines
8.0 KiB
C

/*
* Glyph shaping support
*
* Copyright 2010 Aric Stewart for CodeWeavers
* Copyright 2014 Nikolay Sivov for CodeWeavers
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#define COBJMACROS
#include "dwrite_private.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(dwrite);
#define MS_GPOS_TAG DWRITE_MAKE_OPENTYPE_TAG('G','P','O','S')
struct scriptshaping_cache *create_scriptshaping_cache(void *context, const struct shaping_font_ops *font_ops)
{
struct scriptshaping_cache *cache;
cache = heap_alloc_zero(sizeof(*cache));
if (!cache)
return NULL;
cache->font = font_ops;
cache->context = context;
opentype_layout_scriptshaping_cache_init(cache);
cache->upem = cache->font->get_font_upem(cache->context);
return cache;
}
void release_scriptshaping_cache(struct scriptshaping_cache *cache)
{
if (!cache)
return;
cache->font->release_font_table(cache->context, cache->gdef.table.context);
cache->font->release_font_table(cache->context, cache->gpos.table.context);
heap_free(cache);
}
static void shape_update_clusters_from_glyphprop(UINT32 glyphcount, UINT32 text_len, UINT16 *clustermap, DWRITE_SHAPING_GLYPH_PROPERTIES *glyph_props)
{
UINT32 i;
for (i = 0; i < glyphcount; i++) {
if (!glyph_props[i].isClusterStart) {
UINT32 j;
for (j = 0; j < text_len; j++) {
if (clustermap[j] == i) {
int k = j;
while (k >= 0 && k < text_len && !glyph_props[clustermap[k]].isClusterStart)
k--;
if (k >= 0 && k < text_len && glyph_props[clustermap[k]].isClusterStart)
clustermap[j] = clustermap[k];
}
}
}
}
}
static int compare_clustersearch(const void *a, const void* b)
{
UINT16 target = *(UINT16*)a;
UINT16 index = *(UINT16*)b;
int ret = 0;
if (target > index)
ret = 1;
else if (target < index)
ret = -1;
return ret;
}
/* Maps given glyph position in glyph indices array to text index this glyph represents.
Lowest possible index is returned.
clustermap [I] Text index to index in glyph indices array map
len [I] Clustermap size
target [I] Index in glyph indices array to map
*/
static INT32 map_glyph_to_text_pos(const UINT16 *clustermap, UINT32 len, UINT16 target)
{
UINT16 *ptr;
INT32 k;
ptr = bsearch(&target, clustermap, len, sizeof(UINT16), compare_clustersearch);
if (!ptr)
return -1;
/* get to the beginning */
for (k = (ptr - clustermap) - 1; k >= 0 && clustermap[k] == target; k--)
;
k++;
return k;
}
static HRESULT default_set_text_glyphs_props(struct scriptshaping_context *context, UINT16 *clustermap, UINT16 *glyph_indices,
UINT32 glyphcount, DWRITE_SHAPING_TEXT_PROPERTIES *text_props, DWRITE_SHAPING_GLYPH_PROPERTIES *glyph_props)
{
UINT32 i;
for (i = 0; i < glyphcount; i++) {
UINT32 char_index[20];
UINT32 char_count = 0;
INT32 k;
k = map_glyph_to_text_pos(clustermap, context->length, i);
if (k >= 0) {
for (; k < context->length && clustermap[k] == i; k++)
char_index[char_count++] = k;
}
if (char_count == 0)
continue;
if (char_count == 1 && isspaceW(context->text[char_index[0]])) {
glyph_props[i].justification = SCRIPT_JUSTIFY_BLANK;
text_props[char_index[0]].isShapedAlone = context->text[char_index[0]] == ' ';
}
else
glyph_props[i].justification = SCRIPT_JUSTIFY_CHARACTER;
}
/* FIXME: update properties using GDEF table */
shape_update_clusters_from_glyphprop(glyphcount, context->length, clustermap, glyph_props);
return S_OK;
}
static HRESULT latn_set_text_glyphs_props(struct scriptshaping_context *context, UINT16 *clustermap, UINT16 *glyph_indices,
UINT32 glyphcount, DWRITE_SHAPING_TEXT_PROPERTIES *text_props, DWRITE_SHAPING_GLYPH_PROPERTIES *glyph_props)
{
HRESULT hr;
UINT32 i;
hr = default_set_text_glyphs_props(context, clustermap, glyph_indices, glyphcount, text_props, glyph_props);
for (i = 0; i < glyphcount; i++)
if (glyph_props[i].isZeroWidthSpace)
glyph_props[i].justification = SCRIPT_JUSTIFY_NONE;
return hr;
}
static const DWORD std_gpos_tags[] =
{
DWRITE_FONT_FEATURE_TAG_KERNING,
DWRITE_FONT_FEATURE_TAG_MARK_POSITIONING,
DWRITE_FONT_FEATURE_TAG_MARK_TO_MARK_POSITIONING,
};
static const struct shaping_features std_gpos_features =
{
std_gpos_tags,
ARRAY_SIZE(std_gpos_tags),
};
const struct scriptshaping_ops latn_shaping_ops =
{
NULL,
latn_set_text_glyphs_props,
&std_gpos_features,
};
const struct scriptshaping_ops default_shaping_ops =
{
NULL,
default_set_text_glyphs_props
};
static DWORD shape_select_script(const struct scriptshaping_cache *cache, DWORD kind, const DWORD *scripts,
unsigned int *script_index)
{
static const DWORD fallback_scripts[] =
{
DWRITE_MAKE_OPENTYPE_TAG('D','F','L','T'),
DWRITE_MAKE_OPENTYPE_TAG('d','f','l','t'),
DWRITE_MAKE_OPENTYPE_TAG('l','a','t','n'),
0,
};
DWORD script;
/* Passed scripts in ascending priority. */
while (*scripts)
{
if ((script = opentype_layout_find_script(cache, kind, *scripts, script_index)))
return script;
scripts++;
}
/* 'DFLT' -> 'dflt' -> 'latn' */
scripts = fallback_scripts;
while (*scripts)
{
if ((script = opentype_layout_find_script(cache, kind, *scripts, script_index)))
return script;
scripts++;
}
return 0;
}
static DWORD shape_select_language(const struct scriptshaping_cache *cache, DWORD kind, unsigned int script_index,
DWORD language, unsigned int *language_index)
{
/* Specified language -> 'dflt'. */
if ((language = opentype_layout_find_language(cache, kind, language, script_index, language_index)))
return language;
if ((language = opentype_layout_find_language(cache, kind, DWRITE_MAKE_OPENTYPE_TAG('d','f','l','t'),
script_index, language_index)))
return language;
return 0;
}
HRESULT shape_get_positions(struct scriptshaping_context *context, const DWORD *scripts,
const struct shaping_features *features)
{
struct scriptshaping_cache *cache = context->cache;
unsigned int script_index, language_index;
unsigned int i;
DWORD script;
/* Resolve script tag to actually supported script. */
if (cache->gpos.table.data)
{
if ((script = shape_select_script(cache, MS_GPOS_TAG, scripts, &script_index)))
{
DWORD language = context->language_tag;
if ((language = shape_select_language(cache, MS_GPOS_TAG, script_index, language, &language_index)))
{
TRACE("script %s, language %s.\n", debugstr_tag(script),
language != ~0u ? debugstr_tag(language) : "deflangsys");
opentype_layout_apply_gpos_features(context, script_index, language_index, features);
}
}
}
for (i = 0; i < context->glyph_count; ++i)
if (context->u.pos.glyph_props[i].isZeroWidthSpace)
context->advances[i] = 0.0f;
return S_OK;
}