/**
* pango_ot_ruleset_position:
* @ruleset: a #PangoOTRuleset.
* @buffer: a #PangoOTBuffer.
*
* Performs the OpenType GPOS positioning on @buffer using the features
* in @ruleset
*
* Since: 1.4
**/
void
pango_ot_ruleset_position (const PangoOTRuleset *ruleset,
PangoOTBuffer *buffer)
{
unsigned int i;
HB_GPOS gpos = NULL;
g_return_if_fail (PANGO_IS_OT_RULESET (ruleset));
g_return_if_fail (ruleset->info != NULL);
for (i = 0; i < ruleset->rules->len; i++)
{
PangoOTRule *rule = &g_array_index (ruleset->rules, PangoOTRule, i);
if (rule->table_type != PANGO_OT_TABLE_GPOS)
continue;
if (!gpos)
{
gpos = pango_ot_info_get_gpos (ruleset->info);
if (gpos)
HB_GPOS_Clear_Features (gpos);
else
return;
}
HB_GPOS_Add_Feature (gpos, rule->feature_index, rule->property_bit);
}
if (HB_GPOS_Apply_String (ruleset->info->face, gpos, 0, buffer->buffer,
FALSE /* enable device-dependant values */,
buffer->rtl) == HB_Err_Ok)
buffer->applied_gpos = TRUE;
}
/**
* pango_ot_ruleset_shape:
* @ruleset: a #PangoOTRuleset.
* @glyphs: a pointer to a #PangoGlyphString.
* @properties: an array containing one #gulong bitfield for each glyph,
* which gives the glyph's properties: If a certain bit is set for a glyph,
* the feature which has the same bit set in its property value is applied.
*
* Shapes a string of glyphs with the given properties according to @ruleset.
**/
void
pango_ot_ruleset_shape (PangoOTRuleset *ruleset,
PangoGlyphString *glyphs,
gulong *properties)
{
int i;
int last_cluster;
int result;
TTO_GSUB gsub = NULL;
TTO_GPOS gpos = NULL;
TTO_GSUB_String *in_string = NULL;
TTO_GSUB_String *out_string = NULL;
TTO_GSUB_String *result_string = NULL;
gboolean need_gsub = FALSE;
gboolean need_gpos = FALSE;
g_return_if_fail (PANGO_OT_IS_RULESET (ruleset));
for (i = 0; i < ruleset->rules->len; i++)
{
PangoOTRule *rule = &g_array_index (ruleset->rules, PangoOTRule, i);
if (rule->table_type == PANGO_OT_TABLE_GSUB)
need_gsub = TRUE;
else
need_gpos = TRUE;
}
if (need_gsub)
{
gsub = pango_ot_info_get_gsub (ruleset->info);
if (gsub)
TT_GSUB_Clear_Features (gsub);
}
if (need_gpos)
{
gpos = pango_ot_info_get_gpos (ruleset->info);
if (gpos)
TT_GPOS_Clear_Features (gpos);
}
for (i = 0; i < ruleset->rules->len; i++)
{
PangoOTRule *rule = &g_array_index (ruleset->rules, PangoOTRule, i);
if (rule->table_type == PANGO_OT_TABLE_GSUB)
{
if (gsub)
TT_GSUB_Add_Feature (gsub, rule->feature_index, rule->property_bit);
}
else
{
if (gpos)
TT_GPOS_Add_Feature (gpos, rule->feature_index, rule->property_bit);
}
}
if (!gsub && !gpos)
return;
result = TT_GSUB_String_New (ruleset->info->face->memory, &in_string);
g_assert (result == FT_Err_Ok);
result = TT_GSUB_String_Set_Length (in_string, glyphs->num_glyphs);
g_assert (result == FT_Err_Ok);
for (i = 0; i < glyphs->num_glyphs; i++)
{
in_string->string[i] = glyphs->glyphs[i].glyph;
in_string->properties[i] = properties[i];
in_string->logClusters[i] = glyphs->log_clusters[i];
}
in_string->max_ligID = i;
if (gsub)
{
result = TT_GSUB_String_New (ruleset->info->face->memory,
&out_string);
g_assert (result == FT_Err_Ok);
result_string = out_string;
TT_GSUB_Apply_String (gsub, in_string, out_string);
}
else
result_string = in_string;
if (gpos)
{
TTO_GPOS_Data *outgpos = NULL;
if (!TT_GPOS_Apply_String (ruleset->info->face, gpos, 0, result_string, &outgpos,
FALSE /* enable device-dependant values */,
FALSE /* Even though this might be r2l text, RTL is handled elsewhere */))
{
for (i = 0; i < result_string->length; i++)
{
FT_Pos x_pos = outgpos[i].x_pos;
FT_Pos y_pos = outgpos[i].y_pos;
int back = i;
int j;
while (outgpos[back].back != 0)
{
back -= outgpos[back].back;
x_pos += outgpos[back].x_pos;
y_pos += outgpos[back].y_pos;
}
for (j = back; j < i; j++)
glyphs->glyphs[i].geometry.x_offset -= glyphs->glyphs[j].geometry.width;
glyphs->glyphs[i].geometry.x_offset += PANGO_UNITS_26_6(x_pos);
glyphs->glyphs[i].geometry.y_offset += PANGO_UNITS_26_6(y_pos);
if (outgpos[i].new_advance)
glyphs->glyphs[i].geometry.width = PANGO_UNITS_26_6(outgpos[i].x_advance);
else
glyphs->glyphs[i].geometry.width += PANGO_UNITS_26_6(outgpos[i].x_advance);
}
FT_Free(gpos->memory, (void *)outgpos);
}
}
pango_glyph_string_set_size (glyphs, result_string->length);
last_cluster = -1;
for (i = 0; i < result_string->length; i++)
{
glyphs->glyphs[i].glyph = result_string->string[i];
glyphs->log_clusters[i] = result_string->logClusters[i];
if (glyphs->log_clusters[i] != last_cluster)
glyphs->glyphs[i].attr.is_cluster_start = 1;
else
glyphs->glyphs[i].attr.is_cluster_start = 0;
last_cluster = glyphs->log_clusters[i];
}
if (in_string)
TT_GSUB_String_Done (in_string);
if (out_string)
TT_GSUB_String_Done (out_string);
}
