wine/dlls/dwrite/shape.c
2014-11-25 13:47:39 +01:00

174 lines
5.0 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"
struct scriptshaping_cache
{
IDWriteFontFace *fontface;
};
HRESULT create_scriptshaping_cache(IDWriteFontFace *fontface, struct scriptshaping_cache **cache)
{
struct scriptshaping_cache *ret;
ret = heap_alloc(sizeof(*ret));
if (!ret)
return E_OUTOFMEMORY;
ret->fontface = fontface;
IDWriteFontFace_AddRef(fontface);
*cache = ret;
return S_OK;
}
void release_scriptshaping_cache(struct scriptshaping_cache *cache)
{
if (!cache)
return;
IDWriteFontFace_Release(cache->fontface);
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;
}
const struct scriptshaping_ops latn_shaping_ops =
{
NULL,
latn_set_text_glyphs_props
};
const struct scriptshaping_ops default_shaping_ops =
{
NULL,
default_set_text_glyphs_props
};