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JUCE/modules/juce_graphics/fonts/harfbuzz/OT/glyf/VarCompositeGlyph.hh
reuk f491f126b7
Add Harfbuzz dependency
2024-04-17 14:41:00 +01:00

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#ifndef OT_GLYF_VARCOMPOSITEGLYPH_HH
#define OT_GLYF_VARCOMPOSITEGLYPH_HH
#include "../../hb-open-type.hh"
#include "coord-setter.hh"
namespace OT {
namespace glyf_impl {
struct VarCompositeGlyphRecord
{
protected:
enum var_composite_glyph_flag_t
{
USE_MY_METRICS = 0x0001,
AXIS_INDICES_ARE_SHORT = 0x0002,
UNIFORM_SCALE = 0x0004,
HAVE_TRANSLATE_X = 0x0008,
HAVE_TRANSLATE_Y = 0x0010,
HAVE_ROTATION = 0x0020,
HAVE_SCALE_X = 0x0040,
HAVE_SCALE_Y = 0x0080,
HAVE_SKEW_X = 0x0100,
HAVE_SKEW_Y = 0x0200,
HAVE_TCENTER_X = 0x0400,
HAVE_TCENTER_Y = 0x0800,
GID_IS_24BIT = 0x1000,
AXES_HAVE_VARIATION = 0x2000,
RESET_UNSPECIFIED_AXES = 0x4000,
};
public:
unsigned int get_size () const
{
unsigned fl = flags;
unsigned int size = min_size;
unsigned axis_width = (fl & AXIS_INDICES_ARE_SHORT) ? 4 : 3;
size += numAxes * axis_width;
if (fl & GID_IS_24BIT) size += 1;
// 2 bytes each for the following flags
fl = fl & (HAVE_TRANSLATE_X | HAVE_TRANSLATE_Y |
HAVE_ROTATION |
HAVE_SCALE_X | HAVE_SCALE_Y |
HAVE_SKEW_X | HAVE_SKEW_Y |
HAVE_TCENTER_X | HAVE_TCENTER_Y);
size += hb_popcount (fl) * 2;
return size;
}
bool has_more () const { return true; }
bool is_use_my_metrics () const { return flags & USE_MY_METRICS; }
bool is_reset_unspecified_axes () const { return flags & RESET_UNSPECIFIED_AXES; }
hb_codepoint_t get_gid () const
{
if (flags & GID_IS_24BIT)
return * (const HBGlyphID24 *) &pad;
else
return * (const HBGlyphID16 *) &pad;
}
void set_gid (hb_codepoint_t gid)
{
if (flags & GID_IS_24BIT)
* (HBGlyphID24 *) &pad = gid;
else
* (HBGlyphID16 *) &pad = gid;
}
unsigned get_numAxes () const
{
return numAxes;
}
unsigned get_num_points () const
{
unsigned fl = flags;
unsigned num = 0;
if (fl & AXES_HAVE_VARIATION) num += numAxes;
/* Hopefully faster code, relying on the value of the flags. */
fl = (((fl & (HAVE_TRANSLATE_Y | HAVE_SCALE_Y | HAVE_SKEW_Y | HAVE_TCENTER_Y)) >> 1) | fl) &
(HAVE_TRANSLATE_X | HAVE_ROTATION | HAVE_SCALE_X | HAVE_SKEW_X | HAVE_TCENTER_X);
num += hb_popcount (fl);
return num;
/* Slower but more readable code. */
if (fl & (HAVE_TRANSLATE_X | HAVE_TRANSLATE_Y)) num++;
if (fl & HAVE_ROTATION) num++;
if (fl & (HAVE_SCALE_X | HAVE_SCALE_Y)) num++;
if (fl & (HAVE_SKEW_X | HAVE_SKEW_Y)) num++;
if (fl & (HAVE_TCENTER_X | HAVE_TCENTER_Y)) num++;
return num;
}
void transform_points (hb_array_t<const contour_point_t> record_points,
hb_array_t<contour_point_t> points) const
{
float matrix[4];
contour_point_t trans;
get_transformation_from_points (record_points.arrayZ, matrix, trans);
auto arrayZ = points.arrayZ;
unsigned count = points.length;
if (matrix[0] != 1.f || matrix[1] != 0.f ||
matrix[2] != 0.f || matrix[3] != 1.f)
for (unsigned i = 0; i < count; i++)
arrayZ[i].transform (matrix);
if (trans.x != 0.f || trans.y != 0.f)
for (unsigned i = 0; i < count; i++)
arrayZ[i].translate (trans);
}
static inline void transform (float (&matrix)[4], contour_point_t &trans,
float (other)[6])
{
// https://github.com/fonttools/fonttools/blob/f66ee05f71c8b57b5f519ee975e95edcd1466e14/Lib/fontTools/misc/transform.py#L268
float xx1 = other[0];
float xy1 = other[1];
float yx1 = other[2];
float yy1 = other[3];
float dx1 = other[4];
float dy1 = other[5];
float xx2 = matrix[0];
float xy2 = matrix[1];
float yx2 = matrix[2];
float yy2 = matrix[3];
float dx2 = trans.x;
float dy2 = trans.y;
matrix[0] = xx1*xx2 + xy1*yx2;
matrix[1] = xx1*xy2 + xy1*yy2;
matrix[2] = yx1*xx2 + yy1*yx2;
matrix[3] = yx1*xy2 + yy1*yy2;
trans.x = xx2*dx1 + yx2*dy1 + dx2;
trans.y = xy2*dx1 + yy2*dy1 + dy2;
}
static void translate (float (&matrix)[4], contour_point_t &trans,
float translateX, float translateY)
{
if (!translateX && !translateY)
return;
trans.x += matrix[0] * translateX + matrix[2] * translateY;
trans.y += matrix[1] * translateX + matrix[3] * translateY;
}
static void scale (float (&matrix)[4], contour_point_t &trans,
float scaleX, float scaleY)
{
if (scaleX == 1.f && scaleY == 1.f)
return;
matrix[0] *= scaleX;
matrix[1] *= scaleX;
matrix[2] *= scaleY;
matrix[3] *= scaleY;
}
static void rotate (float (&matrix)[4], contour_point_t &trans,
float rotation)
{
if (!rotation)
return;
// https://github.com/fonttools/fonttools/blob/f66ee05f71c8b57b5f519ee975e95edcd1466e14/Lib/fontTools/misc/transform.py#L240
rotation = rotation * HB_PI;
float c;
float s;
#ifdef HAVE_SINCOSF
sincosf (rotation, &s, &c);
#else
c = cosf (rotation);
s = sinf (rotation);
#endif
float other[6] = {c, s, -s, c, 0.f, 0.f};
transform (matrix, trans, other);
}
static void skew (float (&matrix)[4], contour_point_t &trans,
float skewX, float skewY)
{
if (!skewX && !skewY)
return;
// https://github.com/fonttools/fonttools/blob/f66ee05f71c8b57b5f519ee975e95edcd1466e14/Lib/fontTools/misc/transform.py#L255
skewX = skewX * HB_PI;
skewY = skewY * HB_PI;
float other[6] = {1.f,
skewY ? tanf (skewY) : 0.f,
skewX ? tanf (skewX) : 0.f,
1.f,
0.f, 0.f};
transform (matrix, trans, other);
}
bool get_points (contour_point_vector_t &points) const
{
unsigned num_points = get_num_points ();
points.alloc (points.length + num_points + 4); // For phantom points
if (unlikely (!points.resize (points.length + num_points, false))) return false;
contour_point_t *rec_points = points.arrayZ + (points.length - num_points);
hb_memset (rec_points, 0, num_points * sizeof (rec_points[0]));
unsigned fl = flags;
unsigned num_axes = numAxes;
unsigned axis_width = (fl & AXIS_INDICES_ARE_SHORT) ? 2 : 1;
unsigned axes_size = num_axes * axis_width;
const F2DOT14 *q = (const F2DOT14 *) (axes_size +
(fl & GID_IS_24BIT ? 3 : 2) +
(const HBUINT8 *) &pad);
unsigned count = num_axes;
if (fl & AXES_HAVE_VARIATION)
{
for (unsigned i = 0; i < count; i++)
rec_points++->x = q++->to_int ();
}
else
q += count;
const HBUINT16 *p = (const HBUINT16 *) q;
if (fl & (HAVE_TRANSLATE_X | HAVE_TRANSLATE_Y))
{
int translateX = (fl & HAVE_TRANSLATE_X) ? * (const FWORD *) p++ : 0;
int translateY = (fl & HAVE_TRANSLATE_Y) ? * (const FWORD *) p++ : 0;
rec_points->x = translateX;
rec_points->y = translateY;
rec_points++;
}
if (fl & HAVE_ROTATION)
{
int rotation = (fl & HAVE_ROTATION) ? ((const F4DOT12 *) p++)->to_int () : 0;
rec_points->x = rotation;
rec_points++;
}
if (fl & (HAVE_SCALE_X | HAVE_SCALE_Y))
{
int scaleX = (fl & HAVE_SCALE_X) ? ((const F6DOT10 *) p++)->to_int () : 1 << 10;
int scaleY = (fl & HAVE_SCALE_Y) ? ((const F6DOT10 *) p++)->to_int () : 1 << 10;
if ((fl & UNIFORM_SCALE) && !(fl & HAVE_SCALE_Y))
scaleY = scaleX;
rec_points->x = scaleX;
rec_points->y = scaleY;
rec_points++;
}
if (fl & (HAVE_SKEW_X | HAVE_SKEW_Y))
{
int skewX = (fl & HAVE_SKEW_X) ? ((const F4DOT12 *) p++)->to_int () : 0;
int skewY = (fl & HAVE_SKEW_Y) ? ((const F4DOT12 *) p++)->to_int () : 0;
rec_points->x = skewX;
rec_points->y = skewY;
rec_points++;
}
if (fl & (HAVE_TCENTER_X | HAVE_TCENTER_Y))
{
int tCenterX = (fl & HAVE_TCENTER_X) ? * (const FWORD *) p++ : 0;
int tCenterY = (fl & HAVE_TCENTER_Y) ? * (const FWORD *) p++ : 0;
rec_points->x = tCenterX;
rec_points->y = tCenterY;
rec_points++;
}
return true;
}
void get_transformation_from_points (const contour_point_t *rec_points,
float (&matrix)[4], contour_point_t &trans) const
{
unsigned fl = flags;
if (fl & AXES_HAVE_VARIATION)
rec_points += numAxes;
matrix[0] = matrix[3] = 1.f;
matrix[1] = matrix[2] = 0.f;
trans.init (0.f, 0.f);
float translateX = 0.f;
float translateY = 0.f;
float rotation = 0.f;
float scaleX = 1.f;
float scaleY = 1.f;
float skewX = 0.f;
float skewY = 0.f;
float tCenterX = 0.f;
float tCenterY = 0.f;
if (fl & (HAVE_TRANSLATE_X | HAVE_TRANSLATE_Y))
{
translateX = rec_points->x;
translateY = rec_points->y;
rec_points++;
}
if (fl & HAVE_ROTATION)
{
rotation = rec_points->x / (1 << 12);
rec_points++;
}
if (fl & (HAVE_SCALE_X | HAVE_SCALE_Y))
{
scaleX = rec_points->x / (1 << 10);
scaleY = rec_points->y / (1 << 10);
rec_points++;
}
if (fl & (HAVE_SKEW_X | HAVE_SKEW_Y))
{
skewX = rec_points->x / (1 << 12);
skewY = rec_points->y / (1 << 12);
rec_points++;
}
if (fl & (HAVE_TCENTER_X | HAVE_TCENTER_Y))
{
tCenterX = rec_points->x;
tCenterY = rec_points->y;
rec_points++;
}
translate (matrix, trans, translateX + tCenterX, translateY + tCenterY);
rotate (matrix, trans, rotation);
scale (matrix, trans, scaleX, scaleY);
skew (matrix, trans, -skewX, skewY);
translate (matrix, trans, -tCenterX, -tCenterY);
}
void set_variations (coord_setter_t &setter,
hb_array_t<contour_point_t> rec_points) const
{
bool have_variations = flags & AXES_HAVE_VARIATION;
unsigned axis_width = (flags & AXIS_INDICES_ARE_SHORT) ? 2 : 1;
unsigned num_axes = numAxes;
const HBUINT8 *p = (const HBUINT8 *) (((HBUINT8 *) &numAxes) + numAxes.static_size + (flags & GID_IS_24BIT ? 3 : 2));
const HBUINT16 *q = (const HBUINT16 *) (((HBUINT8 *) &numAxes) + numAxes.static_size + (flags & GID_IS_24BIT ? 3 : 2));
const F2DOT14 *a = (const F2DOT14 *) ((HBUINT8 *) (axis_width == 1 ? (p + num_axes) : (HBUINT8 *) (q + num_axes)));
unsigned count = num_axes;
for (unsigned i = 0; i < count; i++)
{
unsigned axis_index = axis_width == 1 ? (unsigned) *p++ : (unsigned) *q++;
signed v = have_variations ? rec_points.arrayZ[i].x : a++->to_int ();
v = hb_clamp (v, -(1<<14), (1<<14));
setter[axis_index] = v;
}
}
protected:
HBUINT16 flags;
HBUINT8 numAxes;
HBUINT16 pad;
public:
DEFINE_SIZE_MIN (5);
};
using var_composite_iter_t = composite_iter_tmpl<VarCompositeGlyphRecord>;
struct VarCompositeGlyph
{
const GlyphHeader &header;
hb_bytes_t bytes;
VarCompositeGlyph (const GlyphHeader &header_, hb_bytes_t bytes_) :
header (header_), bytes (bytes_) {}
var_composite_iter_t iter () const
{ return var_composite_iter_t (bytes, &StructAfter<VarCompositeGlyphRecord, GlyphHeader> (header)); }
const hb_bytes_t trim_padding () const
{
unsigned length = GlyphHeader::static_size;
for (auto &comp : iter ())
length += comp.get_size ();
return bytes.sub_array (0, length);
}
};
} /* namespace glyf_impl */
} /* namespace OT */
#endif /* OT_GLYF_VARCOMPOSITEGLYPH_HH */
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