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[paint] Add hb-paint-extents.cc

This commit is contained in:
Behdad Esfahbod 2022-12-24 11:30:45 -07:00
parent 959996d709
commit 11036ed71e
5 changed files with 6 additions and 253 deletions
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1
src/Makefile.sources
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@ -91,6 +91,7 @@ HB_BASE_sources = \
hb-ot-layout-gpos-table.hh \ hb-ot-layout-gpos-table.hh \
hb-paint.cc \ hb-paint.cc \
hb-paint.hh \ hb-paint.hh \
hb-paint-extents.cc \
hb-paint-extents.hh \ hb-paint-extents.hh \
hb-ot-layout-gsub-table.hh \ hb-ot-layout-gsub-table.hh \
OT/glyf/glyf.hh \ OT/glyf/glyf.hh \

1
src/harfbuzz-subset.cc
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@ -41,6 +41,7 @@
#include "hb-ot-shaper-vowel-constraints.cc" #include "hb-ot-shaper-vowel-constraints.cc"
#include "hb-ot-tag.cc" #include "hb-ot-tag.cc"
#include "hb-ot-var.cc" #include "hb-ot-var.cc"
#include "hb-paint-extents.cc"
#include "hb-paint.cc" #include "hb-paint.cc"
#include "hb-set.cc" #include "hb-set.cc"
#include "hb-shape-plan.cc" #include "hb-shape-plan.cc"

1
src/harfbuzz.cc
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@ -46,6 +46,7 @@
#include "hb-ot-shaper-vowel-constraints.cc" #include "hb-ot-shaper-vowel-constraints.cc"
#include "hb-ot-tag.cc" #include "hb-ot-tag.cc"
#include "hb-ot-var.cc" #include "hb-ot-var.cc"
#include "hb-paint-extents.cc"
#include "hb-paint.cc" #include "hb-paint.cc"
#include "hb-set.cc" #include "hb-set.cc"
#include "hb-shape-plan.cc" #include "hb-shape-plan.cc"

255
src/hb-paint-extents.hh → src/hb-paint-extents.cc
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@ -22,11 +22,8 @@
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*/ */
#ifndef HB_PAINT_EXTENTS_HH
#define HB_PAINT_EXTENTS_HH
#include "hb.hh" #include "hb.hh"
#include "hb-paint.hh" #include "hb-paint-extents.hh"
#include "hb-draw.h" #include "hb-draw.h"
/* /*
@ -36,252 +33,6 @@
* https://learn.microsoft.com/en-us/typography/opentype/spec/colr#glyph-metrics-and-boundedness * https://learn.microsoft.com/en-us/typography/opentype/spec/colr#glyph-metrics-and-boundedness
*/ */
typedef struct hb_extents_t
{
hb_extents_t () {}
hb_extents_t (float xmin, float ymin, float xmax, float ymax) :
xmin (xmin), ymin (ymin), xmax (xmax), ymax (ymax) {}
bool is_empty () const { return xmin >= xmax || ymin >= ymax; }
void union_ (const hb_extents_t &o)
{
xmin = hb_min (xmin, o.xmin);
ymin = hb_min (ymin, o.ymin);
xmax = hb_max (xmax, o.xmax);
ymax = hb_max (ymax, o.ymax);
}
void intersect (const hb_extents_t &o)
{
xmin = hb_max (xmin, o.xmin);
ymin = hb_max (ymin, o.ymin);
xmax = hb_min (xmax, o.xmax);
ymax = hb_min (ymax, o.ymax);
}
float xmin = 0.f;
float ymin = 0.f;
float xmax = -1.f;
float ymax = -1.f;
} hb_extents_t;
typedef struct hb_transform_t
{
hb_transform_t () {}
hb_transform_t (float xx, float yx,
float xy, float yy,
float x0, float y0) :
xx (xx), yx (yx), xy (xy), yy (yy), x0 (x0), y0 (y0) {}
void multiply (const hb_transform_t &o)
{
/* Copied from cairo, with "o" being "a" there and "this" being "b" there. */
hb_transform_t r;
r.xx = o.xx * xx + o.yx * xy;
r.yx = o.xx * yx + o.yx * yy;
r.xy = o.xy * xx + o.yy * xy;
r.yy = o.xy * yx + o.yy * yy;
r.x0 = o.x0 * xx + o.y0 * xy + x0;
r.y0 = o.x0 * yx + o.y0 * yy + y0;
*this = r;
}
void transform_distance (float &dx, float &dy)
{
float new_x = xx * dx + xy * dy;
float new_y = yx * dx + yy * dy;
dx = new_x;
dy = new_y;
}
void transform_point (float &x, float &y)
{
transform_distance (x, y);
x += x0;
y += y0;
}
void transform_extents (hb_extents_t extents)
{
float quad_x[4], quad_y[4];
quad_x[0] = extents.xmin;
quad_y[0] = extents.ymin;
quad_x[1] = extents.xmin;
quad_y[1] = extents.ymax;
quad_x[2] = extents.xmax;
quad_y[2] = extents.ymin;
quad_x[3] = extents.xmax;
quad_y[3] = extents.ymax;
for (unsigned i = 0; i < 4; i++)
transform_point (quad_x[i], quad_y[i]);
extents.xmin = extents.xmax = quad_x[0];
extents.ymin = extents.ymax = quad_y[0];
for (unsigned i = 1; i < 4; i++)
{
extents.xmin = hb_min (extents.xmin, quad_x[i]);
extents.ymin = hb_min (extents.ymin, quad_y[i]);
extents.xmax = hb_max (extents.xmax, quad_x[i]);
extents.ymax = hb_max (extents.ymax, quad_y[i]);
}
}
float xx = 1.f;
float yx = 0.f;
float xy = 0.f;
float yy = 1.f;
float x0 = 0.f;
float y0 = 0.f;
} hb_transform_t;
typedef struct hb_bounds_t
{
enum status_t {
EMPTY,
BOUNDED,
UNBOUNDED,
};
hb_bounds_t (status_t status) : status (status) {}
hb_bounds_t (const hb_extents_t &extents) :
status (extents.is_empty () ? EMPTY : BOUNDED), extents (extents) {}
void union_ (const hb_bounds_t &o)
{
if (o.status == UNBOUNDED)
status = UNBOUNDED;
else if (o.status == BOUNDED)
{
if (status == EMPTY)
*this = o;
else if (status == BOUNDED)
extents.union_ (o.extents);
}
}
void intersect (const hb_bounds_t &o)
{
if (o.status == EMPTY)
status = EMPTY;
else if (o.status == BOUNDED)
{
if (status == UNBOUNDED)
*this = o;
else if (status == BOUNDED)
{
extents.intersect (o.extents);
if (extents.is_empty ())
status = EMPTY;
}
}
}
status_t status;
hb_extents_t extents;
} hb_bounds_t;
typedef struct hb_paint_extents_context_t hb_paint_extents_context_t;
struct hb_paint_extents_context_t {
hb_paint_extents_context_t ()
{
clips.push (hb_bounds_t{hb_bounds_t::UNBOUNDED});
groups.push (hb_bounds_t{hb_bounds_t::EMPTY});
transforms.push (hb_transform_t{});
}
hb_extents_t get_extents ()
{
return groups.tail().extents;
}
bool is_bounded ()
{
return groups.tail().status != hb_bounds_t::UNBOUNDED;
}
void push_transform (const hb_transform_t &trans)
{
hb_transform_t r = transforms.tail ();
r.multiply (trans);
transforms.push (r);
}
void pop_transform ()
{
transforms.pop ();
}
void push_clip (hb_extents_t extents)
{
/* Transform extents and push a new clip. */
hb_transform_t &r = transforms.tail ();
r.transform_extents (extents);
hb_bounds_t b {extents};
clips.push (b);
}
void pop_clip ()
{
clips.pop ();
}
void push_group ()
{
groups.push (hb_bounds_t{hb_bounds_t::EMPTY});
}
void pop_group (hb_paint_composite_mode_t mode)
{
const hb_bounds_t src_bounds = groups.pop ();
hb_bounds_t &backdrop_bounds = groups.tail ();
// https://learn.microsoft.com/en-us/typography/opentype/spec/colr#format-32-paintcomposite
switch ((int) mode)
{
case HB_PAINT_COMPOSITE_MODE_CLEAR:
backdrop_bounds.status = hb_bounds_t::EMPTY;
break;
case HB_PAINT_COMPOSITE_MODE_SRC:
case HB_PAINT_COMPOSITE_MODE_SRC_OUT:
backdrop_bounds = src_bounds;
break;
case HB_PAINT_COMPOSITE_MODE_DEST:
case HB_PAINT_COMPOSITE_MODE_DEST_OUT:
break;
case HB_PAINT_COMPOSITE_MODE_SRC_IN:
case HB_PAINT_COMPOSITE_MODE_DEST_IN:
backdrop_bounds.intersect (src_bounds);
break;
default:
backdrop_bounds.union_ (src_bounds);
break;
}
}
void paint ()
{
const hb_bounds_t &clip = clips.tail ();
hb_bounds_t &group = groups.tail ();
group.union_ (clip);
}
hb_vector_t<hb_bounds_t> clips;
hb_vector_t<hb_bounds_t> groups;
hb_vector_t<hb_transform_t> transforms;
};
static void static void
hb_paint_extents_push_transform (hb_paint_funcs_t *funcs HB_UNUSED, hb_paint_extents_push_transform (hb_paint_funcs_t *funcs HB_UNUSED,
void *paint_data, void *paint_data,
@ -509,7 +260,7 @@ hb_paint_extents_paint_sweep_gradient (hb_paint_funcs_t *funcs HB_UNUSED,
c->paint (); c->paint ();
} }
static inline hb_paint_funcs_t * hb_paint_funcs_t *
hb_paint_extents_get_funcs () hb_paint_extents_get_funcs ()
{ {
hb_paint_funcs_t *funcs = hb_paint_funcs_create (); hb_paint_funcs_t *funcs = hb_paint_funcs_create ();
@ -529,5 +280,3 @@ hb_paint_extents_get_funcs ()
return funcs; return funcs;
} }
#endif /* HB_PAINT_EXTENTS_HH */

1
src/meson.build
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@ -46,6 +46,7 @@ hb_base_sources = files(
'hb-draw.hh', 'hb-draw.hh',
'hb-paint.cc', 'hb-paint.cc',
'hb-paint.hh', 'hb-paint.hh',
'hb-paint-extents.cc',
'hb-paint-extents.hh', 'hb-paint-extents.hh',
'hb-face.cc', 'hb-face.cc',
'hb-face.hh', 'hb-face.hh',