HarfBuzz text shaping engine
http://harfbuzz.github.io/
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60 lines
2.2 KiB
60 lines
2.2 KiB
/* |
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* Copyright © 2007,2008,2009,2010 Red Hat, Inc. |
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* Copyright © 2012,2018 Google, Inc. |
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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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* Red Hat Author(s): Behdad Esfahbod |
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* Google Author(s): Behdad Esfahbod |
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*/ |
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#ifndef HB_DISPATCH_HH |
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#define HB_DISPATCH_HH |
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#include "hb.hh" |
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/* |
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* Dispatch |
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*/ |
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template <typename Context, typename Return=hb_empty_t, unsigned int MaxDebugDepth=0> |
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struct hb_dispatch_context_t |
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{ |
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private: |
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/* https://en.wikipedia.org/wiki/Curiously_recurring_template_pattern */ |
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const Context* thiz () const { return static_cast<const Context *> (this); } |
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Context* thiz () { return static_cast< Context *> (this); } |
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public: |
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const char *get_name () { return "UNKNOWN"; } |
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static constexpr unsigned max_debug_depth = MaxDebugDepth; |
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typedef Return return_t; |
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template <typename T, typename F> |
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bool may_dispatch (const T *obj HB_UNUSED, const F *format HB_UNUSED) { return true; } |
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template <typename T, typename ...Ts> |
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return_t dispatch (const T &obj, Ts&&... ds) |
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{ return obj.dispatch (thiz (), std::forward<Ts> (ds)...); } |
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static return_t no_dispatch_return_value () { return Context::default_return_value (); } |
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static bool stop_sublookup_iteration (const return_t r HB_UNUSED) { return false; } |
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unsigned debug_depth = 0; |
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}; |
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#endif /* HB_DISPATCH_HH */
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