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/*
* Copyright © 2022 Behdad Esfahbod
*
* This is part of HarfBuzz, a text shaping library.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*/
#ifndef HB_PAINT_EXTENTS_HH
#define HB_PAINT_EXTENTS_HH
#include "hb.hh"
#include "hb-paint.h"
#include "hb-geometry.hh"
typedef struct hb_paint_extents_context_t hb_paint_extents_context_t;
struct hb_paint_extents_context_t
{
hb_paint_extents_context_t ()
{
transforms.push (hb_transform_t{});
clips.push (hb_bounds_t{hb_bounds_t::UNBOUNDED});
groups.push (hb_bounds_t{hb_bounds_t::EMPTY});
}
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 t = transforms.tail ();
t.multiply (trans);
transforms.push (t);
}
void pop_transform ()
{
transforms.pop ();
}
void push_clip (hb_extents_t extents)
{
/* Transform extents and push a new clip. */
const hb_transform_t &t = transforms.tail ();
t.transform_extents (extents);
auto bounds = hb_bounds_t {extents};
bounds.intersect (clips.tail ());
clips.push (bounds);
}
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);
}
protected:
hb_vector_t<hb_transform_t> transforms;
hb_vector_t<hb_bounds_t> clips;
hb_vector_t<hb_bounds_t> groups;
};
HB_INTERNAL hb_paint_funcs_t *
hb_paint_extents_get_funcs ();
#endif /* HB_PAINT_EXTENTS_HH */
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