#ifndef HB_AAT_LAYOUT_TRAK_TABLE_HH
#define HB_AAT_LAYOUT_TRAK_TABLE_HH
-#include "hb-aat-layout-common-private.hh"
-#include "hb-ot-layout-private.hh"
-#include "hb-open-type-private.hh"
+#include "hb-aat-layout-common.hh"
+#include "hb-ot-layout.hh"
+#include "hb-open-type.hh"
/*
* trak -- Tracking
{
friend struct TrackData;
- inline bool sanitize (hb_sanitize_context_t *c, const void *base,
- unsigned int size) const
- {
- TRACE_SANITIZE (this);
- return_trace (likely (c->check_struct (this) &&
- (valuesZ.sanitize (c, base, size))));
- }
+ float get_track_value () const { return track.to_float (); }
- private:
- inline float get_track_value () const
- {
- return track.to_float ();
- }
+ int get_value (const void *base, unsigned int index,
+ unsigned int table_size) const
+ { return (base+valuesZ).as_array (table_size)[index]; }
- inline int get_value (const void *base, unsigned int index) const
+ public:
+ bool sanitize (hb_sanitize_context_t *c, const void *base,
+ unsigned int table_size) const
{
- return (base+valuesZ)[index];
+ TRACE_SANITIZE (this);
+ return_trace (likely (c->check_struct (this) &&
+ (valuesZ.sanitize (c, base, table_size))));
}
protected:
Fixed track; /* Track value for this record. */
- NameID trackNameID; /* The 'name' table index for this track */
- OffsetTo<UnsizedArrayOf<FWORD> >
+ NameID trackNameID; /* The 'name' table index for this track.
+ * (a short word or phrase like "loose"
+ * or "very tight") */
+ NNOffsetTo<UnsizedArrayOf<FWORD> >
valuesZ; /* Offset from start of tracking table to
* per-size tracking values for this track. */
struct TrackData
{
- inline bool sanitize (hb_sanitize_context_t *c, const void *base) const
+ float interpolate_at (unsigned int idx,
+ float target_size,
+ const TrackTableEntry &trackTableEntry,
+ const void *base) const
{
- TRACE_SANITIZE (this);
- return_trace (c->check_struct (this) &&
- sizeTable.sanitize (c, base, nSizes) &&
- trackTable.sanitize (c, nTracks, base, nSizes));
+ unsigned int sizes = nSizes;
+ hb_array_t<const Fixed> size_table ((base+sizeTable).arrayZ, sizes);
+
+ float s0 = size_table[idx].to_float ();
+ float s1 = size_table[idx + 1].to_float ();
+ float t = unlikely (s0 == s1) ? 0.f : (target_size - s0) / (s1 - s0);
+ return t * trackTableEntry.get_value (base, idx + 1, sizes) +
+ (1.f - t) * trackTableEntry.get_value (base, idx, sizes);
}
- inline float get_tracking (const void *base, float ptem) const
+ int get_tracking (const void *base, float ptem) const
{
/* CoreText points are CSS pixels (96 per inch),
* NOT typographic points (72 per inch).
* https://developer.apple.com/library/content/documentation/GraphicsAnimation/Conceptual/HighResolutionOSX/Explained/Explained.html
*/
float csspx = ptem * 96.f / 72.f;
- Fixed fixed_size;
- fixed_size.set_float (csspx);
- /* XXX Clean this up. Make it work with nSizes==1 and 0. */
+ /*
+ * Choose track.
+ */
+ const TrackTableEntry *trackTableEntry = nullptr;
+ unsigned int count = nTracks;
+ for (unsigned int i = 0; i < count; i++)
+ {
+ /* Note: Seems like the track entries are sorted by values. But the
+ * spec doesn't explicitly say that. It just mentions it in the example. */
- unsigned int sizes = nSizes;
+ /* For now we only seek for track entries with zero tracking value */
- const TrackTableEntry *trackTableEntry = nullptr;
- for (unsigned int i = 0; i < sizes; ++i)
- // For now we only seek for track entries with zero tracking value
if (trackTable[i].get_track_value () == 0.f)
- trackTableEntry = &trackTable[0];
-
- // We couldn't match any, exit
+ {
+ trackTableEntry = &trackTable[i];
+ break;
+ }
+ }
if (!trackTableEntry) return 0.;
- /* TODO bfind() */
+ /*
+ * Choose size.
+ */
+ unsigned int sizes = nSizes;
+ if (!sizes) return 0.;
+ if (sizes == 1) return trackTableEntry->get_value (base, 0, sizes);
+
+ hb_array_t<const Fixed> size_table ((base+sizeTable).arrayZ, sizes);
unsigned int size_index;
- UnsizedArrayOf<Fixed> size_table = base+sizeTable;
- for (size_index = 0; size_index < sizes; ++size_index)
- if (size_table[size_index] >= fixed_size)
+ for (size_index = 0; size_index < sizes - 1; size_index++)
+ if (size_table[size_index].to_float () >= csspx)
break;
- // TODO(ebraminio): We don't attempt to extrapolate to larger or
- // smaller values for now but we should do, per spec
- if (size_index == sizes)
- return trackTableEntry->get_value (base, sizes - 1);
- if (size_index == 0 || size_table[size_index] == fixed_size)
- return trackTableEntry->get_value (base, size_index);
-
- float s0 = size_table[size_index - 1].to_float ();
- float s1 = size_table[size_index].to_float ();
- float t = (csspx - s0) / (s1 - s0);
- return (float) t * trackTableEntry->get_value (base, size_index) +
- ((float) 1.0 - t) * trackTableEntry->get_value (base, size_index - 1);
+ return round (interpolate_at (size_index ? size_index - 1 : 0, csspx,
+ *trackTableEntry, base));
+ }
+
+ bool sanitize (hb_sanitize_context_t *c, const void *base) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (likely (c->check_struct (this) &&
+ sizeTable.sanitize (c, base, nSizes) &&
+ trackTable.sanitize (c, nTracks, base, nSizes)));
}
protected:
HBUINT16 nTracks; /* Number of separate tracks included in this table. */
HBUINT16 nSizes; /* Number of point sizes included in this table. */
- LOffsetTo<UnsizedArrayOf<Fixed> >
- sizeTable; /* Offset to array[nSizes] of size values. */
+ LOffsetTo<UnsizedArrayOf<Fixed>, false>
+ sizeTable; /* Offset from start of the tracking table to
+ * Array[nSizes] of size values.. */
UnsizedArrayOf<TrackTableEntry>
trackTable; /* Array[nTracks] of TrackTableEntry records. */
struct trak
{
- static const hb_tag_t tableTag = HB_AAT_TAG_trak;
-
- inline bool sanitize (hb_sanitize_context_t *c) const
- {
- TRACE_SANITIZE (this);
+ static constexpr hb_tag_t tableTag = HB_AAT_TAG_trak;
- return_trace (unlikely (c->check_struct (this) &&
- horizData.sanitize (c, this, this) &&
- vertData.sanitize (c, this, this)));
- }
+ bool has_data () const { return version.to_int (); }
- inline bool apply (hb_aat_apply_context_t *c) const
+ bool apply (hb_aat_apply_context_t *c) const
{
TRACE_APPLY (this);
+ hb_mask_t trak_mask = c->plan->trak_mask;
+
const float ptem = c->font->ptem;
if (unlikely (ptem <= 0.f))
return_trace (false);
if (HB_DIRECTION_IS_HORIZONTAL (buffer->props.direction))
{
const TrackData &trackData = this+horizData;
- float tracking = trackData.get_tracking (this, ptem);
- hb_position_t advance_to_add = c->font->em_scalef_x (tracking / 2);
+ int tracking = trackData.get_tracking (this, ptem);
+ hb_position_t offset_to_add = c->font->em_scalef_x (tracking / 2);
+ hb_position_t advance_to_add = c->font->em_scalef_x (tracking);
foreach_grapheme (buffer, start, end)
{
- /* TODO This is wrong. */
+ if (!(buffer->info[start].mask & trak_mask)) continue;
buffer->pos[start].x_advance += advance_to_add;
- buffer->pos[end].x_advance += advance_to_add;
+ buffer->pos[start].x_offset += offset_to_add;
}
}
else
{
const TrackData &trackData = this+vertData;
- float tracking = trackData.get_tracking (this, ptem);
- hb_position_t advance_to_add = c->font->em_scalef_y (tracking / 2);
+ int tracking = trackData.get_tracking (this, ptem);
+ hb_position_t offset_to_add = c->font->em_scalef_y (tracking / 2);
+ hb_position_t advance_to_add = c->font->em_scalef_y (tracking);
foreach_grapheme (buffer, start, end)
{
- /* TODO This is wrong. */
+ if (!(buffer->info[start].mask & trak_mask)) continue;
buffer->pos[start].y_advance += advance_to_add;
- buffer->pos[end].y_advance += advance_to_add;
+ buffer->pos[start].y_offset += offset_to_add;
}
}
return_trace (true);
}
+ bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+
+ return_trace (likely (c->check_struct (this) &&
+ version.major == 1 &&
+ horizData.sanitize (c, this, this) &&
+ vertData.sanitize (c, this, this)));
+ }
+
protected:
- FixedVersion<> version; /* Version of the tracking table--currently
- * 0x00010000u for version 1.0. */
- HBUINT16 format; /* Format of the tracking table */
- OffsetTo<TrackData> horizData; /* TrackData for horizontal text */
- OffsetTo<TrackData> vertData; /* TrackData for vertical text */
- HBUINT16 reserved; /* Reserved. Set to 0. */
+ FixedVersion<>version; /* Version of the tracking table
+ * (0x00010000u for version 1.0). */
+ HBUINT16 format; /* Format of the tracking table (set to 0). */
+ OffsetTo<TrackData>
+ horizData; /* Offset from start of tracking table to TrackData
+ * for horizontal text (or 0 if none). */
+ OffsetTo<TrackData>
+ vertData; /* Offset from start of tracking table to TrackData
+ * for vertical text (or 0 if none). */
+ HBUINT16 reserved; /* Reserved. Set to 0. */
public:
- DEFINE_SIZE_MIN (12);
+ DEFINE_SIZE_STATIC (12);
};
} /* namespace AAT */
projects / platform / upstream / harfbuzz.git / blobdiff