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[GPOS] PairPosFormat1

This commit is contained in:
Behdad Esfahbod 2009-05-19 22:16:04 -04:00
parent 056c7ec1ae
commit b24ecbadf4
1 changed files with 73 additions and 18 deletions
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91
src/hb-ot-layout-gpos-private.h
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@ -40,9 +40,6 @@ typedef Value ValueRecord[];
#if 0
struct ValueRecord {
/* TODO */
private:
SHORT xPlacement; /* Horizontal adjustment for
* placement--in design units */
SHORT yPlacement; /* Vertical adjustment for
@ -66,7 +63,6 @@ struct ValueRecord {
* advance--measured from beginning of
* PosTable (may be NULL) */
};
ASSERT_SIZE (ValueRecord, 16);
#endif
struct ValueFormat : USHORT {
@ -146,7 +142,8 @@ struct AnchorFormat1 {
private:
inline void get_anchor (hb_ot_layout_t *layout, hb_codepoint_t glyph_id,
hb_position_t *x, hb_position_t *y) const {
hb_position_t *x, hb_position_t *y) const
{
*x = layout->gpos_info.x_scale * xCoordinate / 0x10000;
*y = layout->gpos_info.y_scale * yCoordinate / 0x10000;
}
@ -164,7 +161,8 @@ struct AnchorFormat2 {
private:
inline void get_anchor (hb_ot_layout_t *layout, hb_codepoint_t glyph_id,
hb_position_t *x, hb_position_t *y) const {
hb_position_t *x, hb_position_t *y) const
{
/* TODO Contour */
*x = layout->gpos_info.x_scale * xCoordinate / 0x10000;
*y = layout->gpos_info.y_scale * yCoordinate / 0x10000;
@ -184,7 +182,8 @@ struct AnchorFormat3 {
private:
inline void get_anchor (hb_ot_layout_t *layout, hb_codepoint_t glyph_id,
hb_position_t *x, hb_position_t *y) const {
hb_position_t *x, hb_position_t *y) const
{
/* TODO Device */
*x += layout->gpos_info.x_scale * xCoordinate / 0x10000;
*y += layout->gpos_info.y_scale * yCoordinate / 0x10000;
@ -208,7 +207,8 @@ ASSERT_SIZE (AnchorFormat3, 10);
struct Anchor {
inline void get_anchor (hb_ot_layout_t *layout, hb_codepoint_t glyph_id,
hb_position_t *x, hb_position_t *y) const {
hb_position_t *x, hb_position_t *y) const
{
*x = *y = 0;
switch (u.format) {
case 1: u.format1->get_anchor (layout, glyph_id, x, y); return;
@ -257,8 +257,8 @@ struct SinglePosFormat1 {
friend struct SinglePos;
private:
inline bool apply (APPLY_ARG_DEF) const {
inline bool apply (APPLY_ARG_DEF) const
{
unsigned int index = (this+coverage) (IN_CURGLYPH ());
if (HB_LIKELY (index == NOT_COVERED))
return false;
@ -285,8 +285,8 @@ struct SinglePosFormat2 {
friend struct SinglePos;
private:
inline bool apply (APPLY_ARG_DEF) const {
inline bool apply (APPLY_ARG_DEF) const
{
unsigned int index = (this+coverage) (IN_CURGLYPH ());
if (HB_LIKELY (index == NOT_COVERED))
return false;
@ -319,7 +319,8 @@ struct SinglePos {
private:
inline bool apply (APPLY_ARG_DEF) const {
inline bool apply (APPLY_ARG_DEF) const
{
switch (u.format) {
case 1: return u.format1->apply (APPLY_ARG);
case 2: return u.format2->apply (APPLY_ARG);
@ -338,7 +339,8 @@ ASSERT_SIZE (SinglePos, 2);
struct PairValueRecord {
/* TODO */
friend struct PairPosFormat1;
private:
GlyphID secondGlyph; /* GlyphID of second glyph in the
@ -349,8 +351,26 @@ struct PairValueRecord {
};
ASSERT_SIZE (PairValueRecord, 2);
/* XXXXXXXXXXXXXXXXXXXX */
typedef ArrayOf<PairValueRecord> PairSet;
struct PairSet {
friend struct PairPosFormat1;
private:
inline bool apply (APPLY_ARG_DEF,
ValueFormat &f1, ValueFormat &f2,
unsigned int next_pos) const {
return true;
}
private:
USHORT len; /* Number of PairValueRecords */
/* XXX */
PairValueRecord
array[]; /* Array of PairValueRecords--ordered
* by GlyphID of the second glyph */
};
ASSERT_SIZE (PairSet, 2);
struct PairPosFormat1 {
@ -358,8 +378,43 @@ struct PairPosFormat1 {
friend struct PairPos;
private:
inline bool apply (APPLY_ARG_DEF) const {
/* TODO */
inline bool apply (APPLY_ARG_DEF) const
{
unsigned int end = MIN (buffer->in_length, buffer->in_pos + context_length);
if (HB_UNLIKELY (buffer->in_pos + 2 > end))
return false;
unsigned int index = (this+coverage) (IN_CURGLYPH ());
if (HB_LIKELY (index == NOT_COVERED))
return false;
unsigned int j = buffer->in_pos + 1;
while (!_hb_ot_layout_check_glyph_property (layout, IN_ITEM (j), lookup_flag, &property)) {
if (HB_UNLIKELY (j == end))
return false;
j++;
}
const PairSet &pair_set = this+pairSet[index];
unsigned int len1 = valueFormat1.get_len (),
len2 = valueFormat2.get_len ();
unsigned int record_len = 1 + len1 + len2;
unsigned int count = pair_set.len;
const PairValueRecord *record = pair_set.array;
for (unsigned int i = 0; i < count; i++) {
if (IN_GLYPH (j) == record->secondGlyph) {
valueFormat1.apply_value (layout, (const char *) this, record->values, CURPOSITION ());
valueFormat2.apply_value (layout, (const char *) this, record->values + len1, POSITION (j));
if (len2)
j++;
buffer->in_pos = j;
return true;
}
record += record_len;
}
return false;
}