135 lines
3.4 KiB
C++
135 lines
3.4 KiB
C++
/*
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* Copyright © 2022 Behdad Esfahbod
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*/
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#ifndef HB_PAINT_EXTENTS_HH
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#define HB_PAINT_EXTENTS_HH
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#include "hb.hh"
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#include "hb-paint.h"
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#include "hb-geometry.hh"
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typedef struct hb_paint_extents_context_t hb_paint_extents_context_t;
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struct hb_paint_extents_context_t
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{
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hb_paint_extents_context_t ()
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{
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transforms.push (hb_transform_t{});
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clips.push (hb_bounds_t{hb_bounds_t::UNBOUNDED});
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groups.push (hb_bounds_t{hb_bounds_t::EMPTY});
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}
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hb_extents_t get_extents ()
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{
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return groups.tail().extents;
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}
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bool is_bounded ()
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{
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return groups.tail().status != hb_bounds_t::UNBOUNDED;
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}
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void push_transform (const hb_transform_t &trans)
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{
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hb_transform_t t = transforms.tail ();
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t.multiply (trans);
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transforms.push (t);
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}
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void pop_transform ()
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{
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transforms.pop ();
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}
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void push_clip (hb_extents_t extents)
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{
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/* Transform extents and push a new clip. */
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const hb_transform_t &t = transforms.tail ();
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t.transform_extents (extents);
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auto bounds = hb_bounds_t {extents};
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bounds.intersect (clips.tail ());
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clips.push (bounds);
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}
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void pop_clip ()
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{
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clips.pop ();
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}
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void push_group ()
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{
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groups.push (hb_bounds_t {hb_bounds_t::EMPTY});
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}
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void pop_group (hb_paint_composite_mode_t mode)
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{
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const hb_bounds_t src_bounds = groups.pop ();
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hb_bounds_t &backdrop_bounds = groups.tail ();
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// https://learn.microsoft.com/en-us/typography/opentype/spec/colr#format-32-paintcomposite
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switch ((int) mode)
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{
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case HB_PAINT_COMPOSITE_MODE_CLEAR:
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backdrop_bounds.status = hb_bounds_t::EMPTY;
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break;
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case HB_PAINT_COMPOSITE_MODE_SRC:
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case HB_PAINT_COMPOSITE_MODE_SRC_OUT:
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backdrop_bounds = src_bounds;
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break;
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case HB_PAINT_COMPOSITE_MODE_DEST:
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case HB_PAINT_COMPOSITE_MODE_DEST_OUT:
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break;
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case HB_PAINT_COMPOSITE_MODE_SRC_IN:
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case HB_PAINT_COMPOSITE_MODE_DEST_IN:
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backdrop_bounds.intersect (src_bounds);
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break;
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default:
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backdrop_bounds.union_ (src_bounds);
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break;
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}
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}
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void paint ()
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{
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const hb_bounds_t &clip = clips.tail ();
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hb_bounds_t &group = groups.tail ();
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group.union_ (clip);
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}
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protected:
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hb_vector_t<hb_transform_t> transforms;
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hb_vector_t<hb_bounds_t> clips;
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hb_vector_t<hb_bounds_t> groups;
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};
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HB_INTERNAL hb_paint_funcs_t *
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hb_paint_extents_get_funcs ();
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#endif /* HB_PAINT_EXTENTS_HH */
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