[Complex Text Layouts] Add third-party TextServer dependencies (ICU, HarfBuzz, Graphite).

thirdparty/graphite/src/inc/Code.h

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+/*  GRAPHITE2 LICENSING
+
+    Copyright 2010, SIL International
+    All rights reserved.
+
+    This library is free software; you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published
+    by the Free Software Foundation; either version 2.1 of License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should also have received a copy of the GNU Lesser General Public
+    License along with this library in the file named "LICENSE".
+    If not, write to the Free Software Foundation, 51 Franklin Street,
+    Suite 500, Boston, MA 02110-1335, USA or visit their web page on the
+    internet at http://www.fsf.org/licenses/lgpl.html.
+
+Alternatively, the contents of this file may be used under the terms of the
+Mozilla Public License (http://mozilla.org/MPL) or the GNU General Public
+License, as published by the Free Software Foundation, either version 2
+of the License or (at your option) any later version.
+*/
+// This class represents loaded graphite stack machine code.  It performs
+// basic sanity checks, on the incoming code to prevent more obvious problems
+// from crashing graphite.
+// Author: Tim Eves
+
+#pragma once
+
+#include <cassert>
+#include <graphite2/Types.h>
+#include "inc/Main.h"
+#include "inc/Machine.h"
+
+namespace graphite2 {
+
+class Silf;
+class Face;
+
+enum passtype {
+    PASS_TYPE_UNKNOWN = 0,
+    PASS_TYPE_LINEBREAK,
+    PASS_TYPE_SUBSTITUTE,
+    PASS_TYPE_POSITIONING,
+    PASS_TYPE_JUSTIFICATION
+};
+
+namespace vm {
+
+class Machine::Code
+{
+public:
+    enum status_t
+    {
+        loaded,
+        alloc_failed,
+        invalid_opcode,
+        unimplemented_opcode_used,
+        out_of_range_data,
+        jump_past_end,
+        arguments_exhausted,
+        missing_return,
+        nested_context_item,
+        underfull_stack
+    };
+
+private:
+    class decoder;
+
+    instr *     _code;
+    byte  *     _data;
+    size_t      _data_size,
+                _instr_count;
+    byte        _max_ref;
+    mutable status_t _status;
+    bool        _constraint,
+                _modify,
+                _delete;
+    mutable bool _own;
+
+    void release_buffers() throw ();
+    void failure(const status_t) throw();
+
+public:
+    static size_t estimateCodeDataOut(size_t num_bytecodes, int nRules, int nSlots);
+
+    Code() throw();
+    Code(bool is_constraint, const byte * bytecode_begin, const byte * const bytecode_end,
+         uint8 pre_context, uint16 rule_length, const Silf &, const Face &,
+         enum passtype pt, byte * * const _out = 0);
+    Code(const Machine::Code &) throw();
+    ~Code() throw();
+
+    Code & operator=(const Code &rhs) throw();
+    operator bool () const throw()                  { return _code && status() == loaded; }
+    status_t      status() const throw()            { return _status; }
+    bool          constraint() const throw()        { return _constraint; }
+    size_t        dataSize() const throw()          { return _data_size; }
+    size_t        instructionCount() const throw()  { return _instr_count; }
+    bool          immutable() const throw()         { return !(_delete || _modify); }
+    bool          deletes() const throw()           { return _delete; }
+    size_t        maxRef() const throw()            { return _max_ref; }
+    void          externalProgramMoved(ptrdiff_t) throw();
+
+    int32 run(Machine &m, slotref * & map) const;
+
+    CLASS_NEW_DELETE;
+};
+
+inline
+size_t  Machine::Code::estimateCodeDataOut(size_t n_bc, int nRules, int nSlots)
+{
+    // max is: all codes are instructions + 1 for each rule + max tempcopies
+    // allocate space for separate maximal code and data then merge them later
+    return (n_bc + nRules + nSlots) * sizeof(instr) + n_bc * sizeof(byte);
+}
+
+
+inline Machine::Code::Code() throw()
+: _code(0), _data(0), _data_size(0), _instr_count(0), _max_ref(0),
+  _status(loaded), _constraint(false), _modify(false), _delete(false),
+  _own(false)
+{
+}
+
+inline Machine::Code::Code(const Machine::Code &obj) throw ()
+ :  _code(obj._code),
+    _data(obj._data),
+    _data_size(obj._data_size),
+    _instr_count(obj._instr_count),
+    _max_ref(obj._max_ref),
+    _status(obj._status),
+    _constraint(obj._constraint),
+    _modify(obj._modify),
+    _delete(obj._delete),
+    _own(obj._own)
+{
+    obj._own = false;
+}
+
+inline Machine::Code & Machine::Code::operator=(const Machine::Code &rhs) throw() {
+    if (_instr_count > 0)
+        release_buffers();
+    _code        = rhs._code;
+    _data        = rhs._data;
+    _data_size   = rhs._data_size;
+    _instr_count = rhs._instr_count;
+    _status      = rhs._status;
+    _constraint  = rhs._constraint;
+    _modify      = rhs._modify;
+    _delete      = rhs._delete;
+    _own         = rhs._own;
+    rhs._own = false;
+    return *this;
+}
+
+inline void Machine::Code::externalProgramMoved(ptrdiff_t dist) throw()
+{
+    if (_code && !_own)
+    {
+        _code += dist / signed(sizeof(instr));
+        _data += dist;
+    }
+}
+
+} // namespace vm
+} // namespace graphite2