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118 lines
2.8 KiB
C++
118 lines
2.8 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_BOUNDED_HH
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#define HB_PAINT_BOUNDED_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_bounded_context_t hb_paint_bounded_context_t;
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struct hb_paint_bounded_context_t
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{
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void clear ()
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{
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clips = 0;
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bounded = true;
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groups.clear ();
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}
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hb_paint_bounded_context_t ()
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{
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clear ();
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}
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bool is_bounded ()
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{
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return bounded;
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}
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void push_clip ()
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{
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clips++;
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}
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void pop_clip ()
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{
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if (clips == 0) return;
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clips--;
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}
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void push_group ()
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{
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groups.push (bounded);
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bounded = true;
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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 bool src_bounded = bounded;
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bounded = groups.pop ();
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bool &backdrop_bounded = bounded;
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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_bounded = true;
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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_bounded = src_bounded;
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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_bounded = backdrop_bounded && src_bounded;
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break;
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default:
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backdrop_bounded = backdrop_bounded || src_bounded;
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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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if (!clips)
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bounded = false;
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}
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protected:
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bool bounded; // true if current drawing bounded
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unsigned clips; // number of active clips
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hb_vector_t<bool> groups; // true if group bounded
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};
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HB_INTERNAL hb_paint_funcs_t *
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hb_paint_bounded_get_funcs ();
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#endif /* HB_PAINT_BOUNDED_HH */
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