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[GX] Add compact VariationDevice implementation 

Add compact format that uses signed bytes instead of shorts.
This commit is contained in:
Behdad Esfahbod 2016-03-18 15:52:24 -07:00
parent 71b06fd392
commit baa329c6a1
2 changed files with 25 additions and 11 deletions
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1
src/hb-open-type-private.hh
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@ -653,6 +653,7 @@ struct IntType
typedef IntType<int8_t , 1> CHAR; /* 8-bit signed integer. */
typedef IntType<uint8_t , 1> BYTE; /* 8-bit unsigned integer. */
typedef IntType<int8_t , 1> INT8; /* 8-bit signed integer. */
typedef IntType<uint16_t, 2> USHORT; /* 16-bit unsigned integer. */
typedef IntType<int16_t, 2> SHORT; /* 16-bit signed integer. */
typedef IntType<uint32_t, 4> ULONG; /* 32-bit unsigned integer. */

29
src/hb-ot-layout-common-private.hh
View File

@ -1419,6 +1419,9 @@ struct VariationDevice
{
friend struct Device;
static const unsigned short FORMAT_BYTES = 0x0100;
static const unsigned short FORMAT_SHORTS = 0x0101;
private:
inline hb_position_t get_x_delta (hb_font_t *font) const
@ -1431,18 +1434,25 @@ struct VariationDevice
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this) &&
c->check_array (&deltaValue, SHORT::static_size, deltaCount));
c->check_array (&deltaValue, get_item_size (), deltaCount));
}
private:
inline unsigned int get_item_size (void) const
{ return deltaFormat == FORMAT_BYTES ? 1 : 2; }
inline float get_delta (int *coords, unsigned int coord_count) const
{
float v = 0;
const VariationMap &map = this+variationMap;
unsigned int count = MIN ((unsigned int) deltaCount, map.get_len ());
if (get_item_size () == 1)
for (unsigned int i = 0; i < count; i++)
v += deltaValue[i] * map[i].evaluate (coords, coord_count);
v += deltaValue.bytesZ[i] * map[i].evaluate (coords, coord_count);
else
for (unsigned int i = 0; i < count; i++)
v += deltaValue.shortsZ[i] * map[i].evaluate (coords, coord_count);
return v;
}
@ -1450,10 +1460,13 @@ struct VariationDevice
OffsetTo<VariationMap>
variationMap; /* Offset to variation mapping for this table. */
USHORT deltaCount; /* Number of deltas in this table. */
USHORT deltaFormat; /* Format identifier for this table: 0x10 */
SHORT deltaValue[VAR]; /* Deltas as signed values in design space. */
USHORT deltaFormat; /* Format identifier for this table: 0x0100 or 0x0101 */
union {
INT8 bytesZ[VAR]; /* Deltas as signed bytes in design space; format=0x0100 */
SHORT shortsZ[VAR]; /* Deltas as signed shorts in design space; format=0x0101 */
} deltaValue;
public:
DEFINE_SIZE_ARRAY (6, deltaValue);
DEFINE_SIZE_ARRAY (6, deltaValue.shortsZ);
};
struct Device
@ -1464,7 +1477,7 @@ struct Device
{
case 1: case 2: case 3:
return u.hinting.get_x_delta (font);
case 0x10:
case VariationDevice::FORMAT_BYTES: case VariationDevice::FORMAT_SHORTS:
return u.variation.get_x_delta (font);
default:
return 0;
@ -1476,7 +1489,7 @@ struct Device
{
case 1: case 2: case 3:
return u.hinting.get_x_delta (font);
case 0x10:
case VariationDevice::FORMAT_BYTES: case VariationDevice::FORMAT_SHORTS:
return u.variation.get_x_delta (font);
default:
return 0;
@ -1490,7 +1503,7 @@ struct Device
switch (u.b.format) {
case 1: case 2: case 3:
return_trace (u.hinting.sanitize (c));
case 0x10:
case VariationDevice::FORMAT_BYTES: case VariationDevice::FORMAT_SHORTS:
return_trace (u.variation.sanitize (c));
default:
return_trace (true);