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WIP

This commit is contained in:
Behdad Esfahbod 2010-04-21 02:02:57 -04:00
parent 40d73bc68d
commit 673a4efcbc
1 changed files with 81 additions and 21 deletions
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102
src/hb-ot-layout-gpos-private.hh
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@ -52,29 +52,12 @@ struct ValueFormat : USHORT
yAdvDevice = 0x0080, /* Includes vertical Device table for advance */
ignored = 0x0F00, /* Was used in TrueType Open for MM fonts */
reserved = 0xF000 /* For future use */
devices = 0x00F0, /* Mask for having any Device table */
};
inline unsigned int get_len () const
{ return _hb_popcount32 ((unsigned int) *this); }
inline unsigned int get_size () const
{ return get_len () * Value::get_size (); }
void apply_value (hb_ot_layout_context_t *context,
const char *base,
const Value *values,
hb_internal_glyph_position_t *glyph_pos) const
{
unsigned int x_ppem, y_ppem;
hb_16dot16_t x_scale, y_scale;
unsigned int format = *this;
if (!format)
return;
/* All fields are options. Only those available advance the value
* pointer. */
/* All fields are options. Only those available advance the value pointer. */
#if 0
struct ValueRecord {
SHORT xPlacement; /* Horizontal adjustment for
* placement--in design units */
SHORT yPlacement; /* Vertical adjustment for
@ -97,9 +80,24 @@ struct ValueRecord {
Offset yAdvDevice; /* Offset to Device table for vertical
* advance--measured from beginning of
* PosTable (may be NULL) */
};
#endif
inline unsigned int get_len () const
{ return _hb_popcount32 ((unsigned int) *this); }
inline unsigned int get_size () const
{ return get_len () * Value::get_size (); }
void apply_value (hb_ot_layout_context_t *context,
const char *base,
const Value *values,
hb_internal_glyph_position_t *glyph_pos) const
{
unsigned int x_ppem, y_ppem;
hb_16dot16_t x_scale, y_scale;
unsigned int format = *this;
if (!format) return;
x_scale = context->font->x_scale;
y_scale = context->font->y_scale;
/* design units -> fractional pixel */
@ -124,6 +122,68 @@ struct ValueRecord {
if (y_ppem) glyph_pos->y_advance += (base+*(OffsetTo<Device>*)values++).get_delta (y_ppem) << 16; else values++;
}
}
private:
inline bool sanitize_value_devices (SANITIZE_ARG_DEF, void *base, const Value *values) {
unsigned int format = *this;
if (format & xPlacement) values++;
if (format & yPlacement) values++;
if (format & xAdvance) values++;
if (format & yAdvance) values++;
if ((format & xPlaDevice) && !SANITIZE_BASE (*(OffsetTo<Device>*)values++, base)) return false;
if ((format & yPlaDevice) && !SANITIZE_BASE (*(OffsetTo<Device>*)values++, base)) return false;
if ((format & xAdvDevice) && !SANITIZE_BASE (*(OffsetTo<Device>*)values++, base)) return false;
if ((format & yAdvDevice) && !SANITIZE_BASE (*(OffsetTo<Device>*)values++, base)) return false;
return true;
}
public:
inline bool has_device () {
unsigned int format = *this;
return (format & devices) != 0;
}
inline bool sanitize_value (SANITIZE_ARG_DEF, void *base, const Value *values) {
TRACE_SANITIZE ();
return SANITIZE_MEM (values, get_size ()) &&
(!has_device () || sanitize_value_devices (SANITIZE_ARG, base, values));
}
inline bool sanitize_values (SANITIZE_ARG_DEF, void *base, const Value *values, unsigned int count) {
TRACE_SANITIZE ();
unsigned int len = get_len ();
if (!SANITIZE_ARRAY (values, get_size (), count)) return false;
if (!has_device ()) return true;
for (unsigned int i = 0; i < count; i++) {
if (!sanitize_value_devices (SANITIZE_ARG, base, values))
return false;
values += len;
}
return true;
}
inline bool sanitize_values_stride_unsafe (SANITIZE_ARG_DEF, void *base, const Value *values, unsigned int count, unsigned int stride) {
TRACE_SANITIZE ();
if (!has_device ()) return true;
for (unsigned int i = 0; i < count; i++) {
if (!sanitize_value_devices (SANITIZE_ARG, base, values))
return false;
values += stride;
}
return true;
}
};
ASSERT_SIZE (ValueFormat, 2);