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gcc reports a potential bad array access: ccstruct/mod128.cpp:98:20: warning: array subscript has type 'char' [-Wchar-subscripts] dir is of type 'char'. Most compilers use signed char by default. Then the value of dir is in the range -128 ... 127 and cannot be used to access an array with 256 elements. Don't fix that but disable the buggy code. Signed-off-by: Stefan Weil <sw@weilnetz.de>
102 lines
3.5 KiB
C++
102 lines
3.5 KiB
C++
/**********************************************************************
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* File: mod128.c (Formerly dir128.c)
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* Description: Code to convert a DIR128 to an ICOORD.
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* Author: Ray Smith
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* Created: Tue Oct 22 11:56:09 BST 1991
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*
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* (C) Copyright 1991, Hewlett-Packard Ltd.
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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** http://www.apache.org/licenses/LICENSE-2.0
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*
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**********************************************************************/
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#include "mod128.h"
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const inT16 idirtab[] = {
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1000, 0, 998, 49, 995, 98, 989, 146,
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980, 195, 970, 242, 956, 290, 941, 336,
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923, 382, 903, 427, 881, 471, 857, 514,
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831, 555, 803, 595, 773, 634, 740, 671,
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707, 707, 671, 740, 634, 773, 595, 803,
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555, 831, 514, 857, 471, 881, 427, 903,
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382, 923, 336, 941, 290, 956, 242, 970,
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195, 980, 146, 989, 98, 995, 49, 998,
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0, 1000, -49, 998, -98, 995, -146, 989,
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-195, 980, -242, 970, -290, 956, -336, 941,
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-382, 923, -427, 903, -471, 881, -514, 857,
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-555, 831, -595, 803, -634, 773, -671, 740,
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-707, 707, -740, 671, -773, 634, -803, 595,
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-831, 555, -857, 514, -881, 471, -903, 427,
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-923, 382, -941, 336, -956, 290, -970, 242,
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-980, 195, -989, 146, -995, 98, -998, 49,
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-1000, 0, -998, -49, -995, -98, -989, -146,
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-980, -195, -970, -242, -956, -290, -941, -336,
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-923, -382, -903, -427, -881, -471, -857, -514,
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-831, -555, -803, -595, -773, -634, -740, -671,
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-707, -707, -671, -740, -634, -773, -595, -803,
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-555, -831, -514, -857, -471, -881, -427, -903,
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-382, -923, -336, -941, -290, -956, -242, -970,
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-195, -980, -146, -989, -98, -995, -49, -998,
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0, -1000, 49, -998, 98, -995, 146, -989,
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195, -980, 242, -970, 290, -956, 336, -941,
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382, -923, 427, -903, 471, -881, 514, -857,
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555, -831, 595, -803, 634, -773, 671, -740,
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707, -707, 740, -671, 773, -634, 803, -595,
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831, -555, 857, -514, 881, -471, 903, -427,
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923, -382, 941, -336, 956, -290, 970, -242,
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980, -195, 989, -146, 995, -98, 998, -49
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};
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const ICOORD *dirtab = (ICOORD *) idirtab;
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/**********************************************************************
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* DIR128::DIR128
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*
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* Quantize the direction of an FCOORD to make a DIR128.
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**********************************************************************/
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DIR128::DIR128( //from fcoord
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const FCOORD fc //vector to quantize
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) {
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int high, low, current; //binary search
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low = 0;
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if (fc.y () == 0) {
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if (fc.x () >= 0)
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dir = 0;
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else
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dir = MODULUS / 2;
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return;
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}
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high = MODULUS;
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do {
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current = (high + low) / 2;
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if (dirtab[current] * fc >= 0)
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low = current;
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else
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high = current;
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}
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while (high - low > 1);
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dir = low;
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}
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/**********************************************************************
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* dir_to_gradient
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*
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* Convert a direction to a vector.
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**********************************************************************/
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#if 0 // code is buggy for negative dir and unused
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ICOORD DIR128::vector() const { //convert to vector
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return dirtab[dir]; //easy really
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}
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#endif
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