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[morx] Add a few debug messages to Ligature chain

This commit is contained in:
Behdad Esfahbod 2018-10-23 01:32:08 -07:00
parent 0e5bcdef7f
commit 531f9822b2
1 changed files with 10 additions and 0 deletions
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10
src/hb-aat-layout-morx-table.hh
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@ -373,6 +373,7 @@ struct LigatureSubtable
hb_buffer_t *buffer = driver->buffer;
unsigned int flags = entry->flags;
DEBUG_MSG (APPLY, nullptr, "Ligature transition at %d", buffer->idx);
if (flags & SetComponent)
{
if (unlikely (match_length >= ARRAY_LENGTH (match_positions)))
@ -383,10 +384,12 @@ struct LigatureSubtable
match_length--;
match_positions[match_length++] = buffer->out_len;
DEBUG_MSG (APPLY, nullptr, "Set component at %d", buffer->out_len);
}
if (flags & PerformAction)
{
DEBUG_MSG (APPLY, nullptr, "Perform action with %d", match_length);
unsigned int end = buffer->out_len;
unsigned int action_idx = entry->data.ligActionIndex;
unsigned int action;
@ -404,10 +407,12 @@ struct LigatureSubtable
if (unlikely (!cursor))
{
/* Stack underflow. Clear the stack. */
DEBUG_MSG (APPLY, nullptr, "Stack underflow");
match_length = 0;
break;
}
DEBUG_MSG (APPLY, nullptr, "Moving to stack position %d", cursor - 1);
buffer->move_to (match_positions[--cursor]);
const HBUINT32 &actionData = ligAction[action_idx];
@ -426,17 +431,22 @@ struct LigatureSubtable
if (unlikely (!componentData.sanitize (&c->sanitizer))) return false;
ligature_idx += componentData;
DEBUG_MSG (APPLY, nullptr, "Action store %d last %d",
bool (action & LigActionStore),
bool (action & LigActionLast));
if (action & (LigActionStore | LigActionLast))
{
const GlyphID &ligatureData = ligature[ligature_idx];
if (unlikely (!ligatureData.sanitize (&c->sanitizer))) return false;
hb_codepoint_t lig = ligatureData;
DEBUG_MSG (APPLY, nullptr, "Produced ligature %d", lig);
buffer->replace_glyph (lig);
/* Now go and delete all subsequent components. */
while (match_length - 1 > cursor)
{
DEBUG_MSG (APPLY, nullptr, "Skipping ligature component");
buffer->move_to (match_positions[--match_length]);
buffer->skip_glyph ();
end--;