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[mort] Refactor offset-to-index mapping

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This commit is contained in:
Behdad Esfahbod 2018-10-31 14:59:14 -07:00
parent b9db610add
commit 3087046d31
1 changed files with 16 additions and 11 deletions
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27
src/hb-aat-layout-morx-table.hh
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@ -457,6 +457,14 @@ struct LigatureSubtable
ligature (table+table->ligature),
match_length (0) {}
template <typename T>
static inline unsigned int offsetToIndex (unsigned int offset,
const void *base,
const T *array)
{
return (offset - ((const char *) array - (const char *) base)) / sizeof (T);
}
inline bool is_actionable (StateTableDriver<Types, EntryData> *driver HB_UNUSED,
const Entry<EntryData> *entry)
{
@ -497,9 +505,9 @@ struct LigatureSubtable
return false; // TODO Work on previous instead?
unsigned int cursor = match_length;
const HBUINT32 *actionData = Types::extended ?
&ligAction[action_idx] :
&StructAtOffset<HBUINT32> (table, action_idx);
if (!Types::extended)
action_idx = offsetToIndex (action_idx, table, ligAction.arrayZ);
const HBUINT32 *actionData = &ligAction[action_idx];
do
{
if (unlikely (!cursor))
@ -522,11 +530,8 @@ struct LigatureSubtable
int32_t offset = (int32_t) uoffset;
unsigned int component_idx = buffer->cur().codepoint + offset;
if (!Types::extended)
component_idx *= 2;
const HBUINT16 &componentData = Types::extended ?
component[component_idx] :
StructAtOffset<HBUINT16> (table, component_idx);
component_idx = offsetToIndex (component_idx * 2, table, component.arrayZ);
const HBUINT16 &componentData = component[component_idx];
if (unlikely (!componentData.sanitize (&c->sanitizer))) return false;
ligature_idx += componentData;
@ -535,9 +540,9 @@ struct LigatureSubtable
bool (action & LigActionLast));
if (action & (LigActionStore | LigActionLast))
{
const GlyphID &ligatureData = Types::extended ?
ligature[ligature_idx] :
StructAtOffset<GlyphID> (table, ligature_idx);
if (!Types::extended)
ligature_idx = offsetToIndex (ligature_idx, table, ligature.arrayZ);
const GlyphID &ligatureData = ligature[ligature_idx];
if (unlikely (!ligatureData.sanitize (&c->sanitizer))) return false;
hb_codepoint_t lig = ligatureData;