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<div class="title">jas_fix.h</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * Copyright (c) 1999-2000 Image Power, Inc. and the University of</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * British Columbia.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * Copyright (c) 2001-2002 Michael David Adams.</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * All rights reserved.</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> </div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">/* __START_OF_JASPER_LICENSE__</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * </span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> * JasPer License Version 2.0</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * </span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * Copyright (c) 2001-2006 Michael David Adams</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * Copyright (c) 1999-2000 Image Power, Inc.</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * Copyright (c) 1999-2000 The University of British Columbia</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * </span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * All rights reserved.</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * </span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * Permission is hereby granted, free of charge, to any person (the</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> * "User") obtaining a copy of this software and associated documentation</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> * files (the "Software"), to deal in the Software without restriction,</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> * including without limitation the rights to use, copy, modify, merge,</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment"> * publish, distribute, and/or sell copies of the Software, and to permit</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment"> * persons to whom the Software is furnished to do so, subject to the</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"> * following conditions:</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"> * </span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> * 1. The above copyright notices and this permission notice (which</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> * includes the disclaimer below) shall be included in all copies or</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"> * substantial portions of the Software.</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment"> * </span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment"> * 2. The name of a copyright holder shall not be used to endorse or</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment"> * promote products derived from the Software without specific prior</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment"> * written permission.</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment"> * </span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment"> * THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment"> * LICENSE. NO USE OF THE SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment"> * THIS DISCLAIMER. THE SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment"> * "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment"> * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment"> * PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. IN NO</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment"> * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment"> * INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment"> * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="comment"> * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment"> * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. NO ASSURANCES ARE</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment"> * PROVIDED BY THE COPYRIGHT HOLDERS THAT THE SOFTWARE DOES NOT INFRINGE</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="comment"> * THE PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OF ANY OTHER ENTITY.</span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="comment"> * EACH COPYRIGHT HOLDER DISCLAIMS ANY LIABILITY TO THE USER FOR CLAIMS</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment"> * BROUGHT BY ANY OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment"> * PROPERTY RIGHTS OR OTHERWISE. AS A CONDITION TO EXERCISING THE RIGHTS</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment"> * GRANTED HEREUNDER, EACH USER HEREBY ASSUMES SOLE RESPONSIBILITY TO SECURE</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment"> * ANY OTHER INTELLECTUAL PROPERTY RIGHTS NEEDED, IF ANY. THE SOFTWARE</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="comment"> * IS NOT FAULT-TOLERANT AND IS NOT INTENDED FOR USE IN MISSION-CRITICAL</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="comment"> * SYSTEMS, SUCH AS THOSE USED IN THE OPERATION OF NUCLEAR FACILITIES,</span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="comment"> * AIRCRAFT NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL</span></div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="comment"> * SYSTEMS, DIRECT LIFE SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="comment"> * THE FAILURE OF THE SOFTWARE OR SYSTEM COULD LEAD DIRECTLY TO DEATH,</span></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="comment"> * PERSONAL INJURY, OR SEVERE PHYSICAL OR ENVIRONMENTAL DAMAGE ("HIGH</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="comment"> * RISK ACTIVITIES"). THE COPYRIGHT HOLDERS SPECIFICALLY DISCLAIM ANY</span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="comment"> * EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR HIGH RISK ACTIVITIES.</span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment"> * </span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment"> * __END_OF_JASPER_LICENSE__</span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> </div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="comment"> * Fixed-Point Number Class</span></div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="comment"> * $Id$</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> </div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="preprocessor">#ifndef JAS_FIX_H</span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="preprocessor">#define JAS_FIX_H</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> </div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="comment">/******************************************************************************\</span></div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="comment">* Includes.</span></div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="comment">\******************************************************************************/</span></div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> </div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="comment">/* The configuration header file should be included first. */</span></div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="preprocessor">#include <jasper/jas_config.h></span></div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> </div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="preprocessor">#include <stdio.h></span></div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="preprocessor">#include <stdlib.h></span></div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="preprocessor">#include <math.h></span></div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> </div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="preprocessor">#include <jasper/jas_types.h></span></div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="preprocessor">#include <jasper/jas_debug.h></span></div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> </div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="preprocessor">#ifdef __cplusplus</span></div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span> <span class="keyword">extern</span> <span class="stringliteral">"C"</span> {</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> </div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="comment">/******************************************************************************\</span></div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="comment">* Constants.</span></div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="comment">\******************************************************************************/</span></div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> </div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span> <span class="comment">/* The representation of the value zero. */</span></div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span> <span class="preprocessor">#define JAS_FIX_ZERO(fix_t, fracbits) \</span></div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span> <span class="preprocessor"> JAS_CAST(fix_t, 0)</span></div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> </div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span> <span class="comment">/* The representation of the value one. */</span></div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span> <span class="preprocessor">#define JAS_FIX_ONE(fix_t, fracbits) \</span></div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span> <span class="preprocessor"> (JAS_CAST(fix_t, 1) << (fracbits))</span></div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span> </div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> <span class="comment">/* The representation of the value one half. */</span></div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span> <span class="preprocessor">#define JAS_FIX_HALF(fix_t, fracbits) \</span></div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> <span class="preprocessor"> (JAS_CAST(fix_t, 1) << ((fracbits) - 1))</span></div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span> </div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span> <span class="comment">/******************************************************************************\</span></div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span> <span class="comment">* Conversion operations.</span></div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span> <span class="comment">\******************************************************************************/</span></div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span> </div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span> <span class="comment">/* Convert an int to a fixed-point number. */</span></div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span> <span class="preprocessor">#define JAS_INTTOFIX(fix_t, fracbits, x) \</span></div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span> <span class="preprocessor"> JAS_CAST(fix_t, (x) << (fracbits))</span></div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> </div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span> <span class="comment">/* Convert a fixed-point number to an int. */</span></div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> <span class="preprocessor">#define JAS_FIXTOINT(fix_t, fracbits, x) \</span></div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> <span class="preprocessor"> JAS_CAST(int, (x) >> (fracbits))</span></div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> </div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span> <span class="comment">/* Convert a fixed-point number to a double. */</span></div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span> <span class="preprocessor">#define JAS_FIXTODBL(fix_t, fracbits, x) \</span></div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span> <span class="preprocessor"> (JAS_CAST(double, x) / (JAS_CAST(fix_t, 1) << (fracbits)))</span></div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span> </div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span> <span class="comment">/* Convert a double to a fixed-point number. */</span></div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span> <span class="preprocessor">#define JAS_DBLTOFIX(fix_t, fracbits, x) \</span></div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span> <span class="preprocessor"> JAS_CAST(fix_t, ((x) * JAS_CAST(double, JAS_CAST(fix_t, 1) << (fracbits))))</span></div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span> </div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span> <span class="comment">/******************************************************************************\</span></div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span> <span class="comment">* Basic arithmetic operations.</span></div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span> <span class="comment">* All other arithmetic operations are synthesized from these basic operations.</span></div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span> <span class="comment">* There are three macros for each type of arithmetic operation.</span></div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span> <span class="comment">* One macro always performs overflow/underflow checking, one never performs</span></div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span> <span class="comment">* overflow/underflow checking, and one is generic with its behavior</span></div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span> <span class="comment">* depending on compile-time flags.</span></div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span> <span class="comment">* Only the generic macros should be invoked directly by application code.</span></div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span> <span class="comment">\******************************************************************************/</span></div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span> </div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span> <span class="comment">/* Calculate the sum of two fixed-point numbers. */</span></div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span> <span class="preprocessor">#if !defined(DEBUG_OVERFLOW)</span></div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span> <span class="preprocessor">#define JAS_FIX_ADD JAS_FIX_ADD_FAST</span></div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span> <span class="preprocessor">#define JAS_FIX_ADD JAS_FIX_ADD_OFLOW</span></div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span> </div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span> <span class="comment">/* Calculate the sum of two fixed-point numbers without overflow checking. */</span></div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span> <span class="preprocessor">#define JAS_FIX_ADD_FAST(fix_t, fracbits, x, y) ((x) + (y))</span></div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span> </div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span> <span class="comment">/* Calculate the sum of two fixed-point numbers with overflow checking. */</span></div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span> <span class="preprocessor">#define JAS_FIX_ADD_OFLOW(fix_t, fracbits, x, y) \</span></div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span> <span class="preprocessor"> ((x) >= 0) ? \</span></div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span> <span class="preprocessor"> (((y) >= 0) ? ((x) + (y) >= 0 || JAS_FIX_OFLOW(), (x) + (y)) : \</span></div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span> <span class="preprocessor"> ((x) + (y))) : \</span></div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span> <span class="preprocessor"> (((y) >= 0) ? ((x) + (y)) : ((x) + (y) < 0 || JAS_FIX_OFLOW(), \</span></div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span> <span class="preprocessor"> (x) + (y)))</span></div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span> </div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span> <span class="comment">/* Calculate the product of two fixed-point numbers. */</span></div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span> <span class="preprocessor">#if !defined(DEBUG_OVERFLOW)</span></div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span> <span class="preprocessor">#define JAS_FIX_MUL JAS_FIX_MUL_FAST</span></div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span> <span class="preprocessor">#define JAS_FIX_MUL JAS_FIX_MUL_OFLOW</span></div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span> </div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span> <span class="comment">/* Calculate the product of two fixed-point numbers without overflow</span></div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span> <span class="comment"> checking. */</span></div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span> <span class="preprocessor">#define JAS_FIX_MUL_FAST(fix_t, fracbits, bigfix_t, x, y) \</span></div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span> <span class="preprocessor"> JAS_CAST(fix_t, (JAS_CAST(bigfix_t, x) * JAS_CAST(bigfix_t, y)) >> \</span></div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span> <span class="preprocessor"> (fracbits))</span></div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span> </div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span> <span class="comment">/* Calculate the product of two fixed-point numbers with overflow</span></div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span> <span class="comment"> checking. */</span></div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span> <span class="preprocessor">#define JAS_FIX_MUL_OFLOW(fix_t, fracbits, bigfix_t, x, y) \</span></div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span> <span class="preprocessor"> ((JAS_CAST(bigfix_t, x) * JAS_CAST(bigfix_t, y) >> (fracbits)) == \</span></div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span> <span class="preprocessor"> JAS_CAST(fix_t, (JAS_CAST(bigfix_t, x) * JAS_CAST(bigfix_t, y) >> \</span></div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span> <span class="preprocessor"> (fracbits))) ? \</span></div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span> <span class="preprocessor"> JAS_CAST(fix_t, (JAS_CAST(bigfix_t, x) * JAS_CAST(bigfix_t, y) >> \</span></div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span> <span class="preprocessor"> (fracbits))) : JAS_FIX_OFLOW())</span></div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span> </div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span> <span class="comment">/* Calculate the product of a fixed-point number and an int. */</span></div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span> <span class="preprocessor">#if !defined(DEBUG_OVERFLOW)</span></div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span> <span class="preprocessor">#define JAS_FIX_MULBYINT JAS_FIX_MULBYINT_FAST</span></div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span> <span class="preprocessor">#define JAS_FIX_MULBYINT JAS_FIX_MULBYINT_OFLOW</span></div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span> </div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span> <span class="comment">/* Calculate the product of a fixed-point number and an int without overflow</span></div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span> <span class="comment"> checking. */</span></div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span> <span class="preprocessor">#define JAS_FIX_MULBYINT_FAST(fix_t, fracbits, x, y) \</span></div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span> <span class="preprocessor"> JAS_CAST(fix_t, ((x) * (y)))</span></div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span> </div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span> <span class="comment">/* Calculate the product of a fixed-point number and an int with overflow</span></div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span> <span class="comment"> checking. */</span></div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span> <span class="preprocessor">#define JAS_FIX_MULBYINT_OFLOW(fix_t, fracbits, x, y) \</span></div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span> <span class="preprocessor"> JAS_FIX_MULBYINT_FAST(fix_t, fracbits, x, y)</span></div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span> </div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span> <span class="comment">/* Calculate the quotient of two fixed-point numbers. */</span></div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span> <span class="preprocessor">#if !defined(DEBUG_OVERFLOW)</span></div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span> <span class="preprocessor">#define JAS_FIX_DIV JAS_FIX_DIV_FAST</span></div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span> <span class="preprocessor">#define JAS_FIX_DIV JAS_FIX_DIV_UFLOW</span></div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span> </div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span> <span class="comment">/* Calculate the quotient of two fixed-point numbers without underflow</span></div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span> <span class="comment"> checking. */</span></div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span> <span class="preprocessor">#define JAS_FIX_DIV_FAST(fix_t, fracbits, bigfix_t, x, y) \</span></div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span> <span class="preprocessor"> JAS_CAST(fix_t, (JAS_CAST(bigfix_t, x) << (fracbits)) / (y))</span></div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span> </div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span> <span class="comment">/* Calculate the quotient of two fixed-point numbers with underflow</span></div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span> <span class="comment"> checking. */</span></div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span> <span class="preprocessor">#define JAS_FIX_DIV_UFLOW(fix_t, fracbits, bigfix_t, x, y) \</span></div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span> <span class="preprocessor"> JAS_FIX_DIV_FAST(fix_t, fracbits, bigfix_t, x, y)</span></div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span> </div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span> <span class="comment">/* Negate a fixed-point number. */</span></div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span> <span class="preprocessor">#if !defined(DEBUG_OVERFLOW)</span></div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span> <span class="preprocessor">#define JAS_FIX_NEG JAS_FIX_NEG_FAST</span></div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span> <span class="preprocessor">#define JAS_FIX_NEG JAS_FIX_NEG_OFLOW</span></div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span> </div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span> <span class="comment">/* Negate a fixed-point number without overflow checking. */</span></div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span> <span class="preprocessor">#define JAS_FIX_NEG_FAST(fix_t, fracbits, x) \</span></div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span> <span class="preprocessor"> (-(x))</span></div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span> </div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span> <span class="comment">/* Negate a fixed-point number with overflow checking. */</span></div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span> <span class="comment">/* Yes, overflow is actually possible for two's complement representations,</span></div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span> <span class="comment"> although highly unlikely to occur. */</span></div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span> <span class="preprocessor">#define JAS_FIX_NEG_OFLOW(fix_t, fracbits, x) \</span></div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span> <span class="preprocessor"> (((x) < 0) ? (-(x) > 0 || JAS_FIX_OFLOW(), -(x)) : (-(x)))</span></div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span> </div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span> <span class="comment">/* Perform an arithmetic shift left of a fixed-point number. */</span></div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span> <span class="preprocessor">#if !defined(DEBUG_OVERFLOW)</span></div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span> <span class="preprocessor">#define JAS_FIX_ASL JAS_FIX_ASL_FAST</span></div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span> <span class="preprocessor">#define JAS_FIX_ASL JAS_FIX_ASL_OFLOW</span></div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span> </div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span> <span class="comment">/* Perform an arithmetic shift left of a fixed-point number without overflow</span></div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span> <span class="comment"> checking. */</span></div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span> <span class="preprocessor">#define JAS_FIX_ASL_FAST(fix_t, fracbits, x, n) \</span></div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span> <span class="preprocessor"> ((x) << (n))</span></div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span> </div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span> <span class="comment">/* Perform an arithmetic shift left of a fixed-point number with overflow</span></div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span> <span class="comment"> checking. */</span></div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span> <span class="preprocessor">#define JAS_FIX_ASL_OFLOW(fix_t, fracbits, x, n) \</span></div>
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span> <span class="preprocessor"> ((((x) << (n)) >> (n)) == (x) || JAS_FIX_OFLOW(), (x) << (n))</span></div>
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span> </div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span> <span class="comment">/* Perform an arithmetic shift right of a fixed-point number. */</span></div>
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span> <span class="preprocessor">#if !defined(DEBUG_OVERFLOW)</span></div>
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span> <span class="preprocessor">#define JAS_FIX_ASR JAS_FIX_ASR_FAST</span></div>
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span> <span class="preprocessor">#define JAS_FIX_ASR JAS_FIX_ASR_UFLOW</span></div>
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span> </div>
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span> <span class="comment">/* Perform an arithmetic shift right of a fixed-point number without underflow</span></div>
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span> <span class="comment"> checking. */</span></div>
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span> <span class="preprocessor">#define JAS_FIX_ASR_FAST(fix_t, fracbits, x, n) \</span></div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span> <span class="preprocessor"> ((x) >> (n))</span></div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span> </div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span> <span class="comment">/* Perform an arithmetic shift right of a fixed-point number with underflow</span></div>
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span> <span class="comment"> checking. */</span></div>
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span> <span class="preprocessor">#define JAS_FIX_ASR_UFLOW(fix_t, fracbits, x, n) \</span></div>
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span> <span class="preprocessor"> JAS_FIX_ASR_FAST(fix_t, fracbits, x, n)</span></div>
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span> </div>
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span> <span class="comment">/******************************************************************************\</span></div>
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span> <span class="comment">* Other basic arithmetic operations.</span></div>
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span> <span class="comment">\******************************************************************************/</span></div>
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span> </div>
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span> <span class="comment">/* Calculate the difference between two fixed-point numbers. */</span></div>
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span> <span class="preprocessor">#define JAS_FIX_SUB(fix_t, fracbits, x, y) \</span></div>
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span> <span class="preprocessor"> JAS_FIX_ADD(fix_t, fracbits, x, JAS_FIX_NEG(fix_t, fracbits, y))</span></div>
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span> </div>
<div class="line"><a name="l00270"></a><span class="lineno"> 270</span> <span class="comment">/* Add one fixed-point number to another. */</span></div>
<div class="line"><a name="l00271"></a><span class="lineno"> 271</span> <span class="preprocessor">#define JAS_FIX_PLUSEQ(fix_t, fracbits, x, y) \</span></div>
<div class="line"><a name="l00272"></a><span class="lineno"> 272</span> <span class="preprocessor"> ((x) = JAS_FIX_ADD(fix_t, fracbits, x, y))</span></div>
<div class="line"><a name="l00273"></a><span class="lineno"> 273</span> </div>
<div class="line"><a name="l00274"></a><span class="lineno"> 274</span> <span class="comment">/* Subtract one fixed-point number from another. */</span></div>
<div class="line"><a name="l00275"></a><span class="lineno"> 275</span> <span class="preprocessor">#define JAS_FIX_MINUSEQ(fix_t, fracbits, x, y) \</span></div>
<div class="line"><a name="l00276"></a><span class="lineno"> 276</span> <span class="preprocessor"> ((x) = JAS_FIX_SUB(fix_t, fracbits, x, y))</span></div>
<div class="line"><a name="l00277"></a><span class="lineno"> 277</span> </div>
<div class="line"><a name="l00278"></a><span class="lineno"> 278</span> <span class="comment">/* Multiply one fixed-point number by another. */</span></div>
<div class="line"><a name="l00279"></a><span class="lineno"> 279</span> <span class="preprocessor">#define JAS_FIX_MULEQ(fix_t, fracbits, bigfix_t, x, y) \</span></div>
<div class="line"><a name="l00280"></a><span class="lineno"> 280</span> <span class="preprocessor"> ((x) = JAS_FIX_MUL(fix_t, fracbits, bigfix_t, x, y))</span></div>
<div class="line"><a name="l00281"></a><span class="lineno"> 281</span> </div>
<div class="line"><a name="l00282"></a><span class="lineno"> 282</span> <span class="comment">/******************************************************************************\</span></div>
<div class="line"><a name="l00283"></a><span class="lineno"> 283</span> <span class="comment">* Miscellaneous operations.</span></div>
<div class="line"><a name="l00284"></a><span class="lineno"> 284</span> <span class="comment">\******************************************************************************/</span></div>
<div class="line"><a name="l00285"></a><span class="lineno"> 285</span> </div>
<div class="line"><a name="l00286"></a><span class="lineno"> 286</span> <span class="comment">/* Calculate the absolute value of a fixed-point number. */</span></div>
<div class="line"><a name="l00287"></a><span class="lineno"> 287</span> <span class="preprocessor">#define JAS_FIX_ABS(fix_t, fracbits, x) \</span></div>
<div class="line"><a name="l00288"></a><span class="lineno"> 288</span> <span class="preprocessor"> (((x) >= 0) ? (x) : (JAS_FIX_NEG(fix_t, fracbits, x)))</span></div>
<div class="line"><a name="l00289"></a><span class="lineno"> 289</span> </div>
<div class="line"><a name="l00290"></a><span class="lineno"> 290</span> <span class="comment">/* Is a fixed-point number an integer? */</span></div>
<div class="line"><a name="l00291"></a><span class="lineno"> 291</span> <span class="preprocessor">#define JAS_FIX_ISINT(fix_t, fracbits, x) \</span></div>
<div class="line"><a name="l00292"></a><span class="lineno"> 292</span> <span class="preprocessor"> (JAS_FIX_FLOOR(fix_t, fracbits, x) == (x))</span></div>
<div class="line"><a name="l00293"></a><span class="lineno"> 293</span> </div>
<div class="line"><a name="l00294"></a><span class="lineno"> 294</span> <span class="comment">/* Get the sign of a fixed-point number. */</span></div>
<div class="line"><a name="l00295"></a><span class="lineno"> 295</span> <span class="preprocessor">#define JAS_FIX_SGN(fix_t, fracbits, x) \</span></div>
<div class="line"><a name="l00296"></a><span class="lineno"> 296</span> <span class="preprocessor"> ((x) >= 0 ? 1 : (-1))</span></div>
<div class="line"><a name="l00297"></a><span class="lineno"> 297</span> </div>
<div class="line"><a name="l00298"></a><span class="lineno"> 298</span> <span class="comment">/******************************************************************************\</span></div>
<div class="line"><a name="l00299"></a><span class="lineno"> 299</span> <span class="comment">* Relational operations.</span></div>
<div class="line"><a name="l00300"></a><span class="lineno"> 300</span> <span class="comment">\******************************************************************************/</span></div>
<div class="line"><a name="l00301"></a><span class="lineno"> 301</span> </div>
<div class="line"><a name="l00302"></a><span class="lineno"> 302</span> <span class="comment">/* Compare two fixed-point numbers. */</span></div>
<div class="line"><a name="l00303"></a><span class="lineno"> 303</span> <span class="preprocessor">#define JAS_FIX_CMP(fix_t, fracbits, x, y) \</span></div>
<div class="line"><a name="l00304"></a><span class="lineno"> 304</span> <span class="preprocessor"> ((x) > (y) ? 1 : (((x) == (y)) ? 0 : (-1)))</span></div>
<div class="line"><a name="l00305"></a><span class="lineno"> 305</span> </div>
<div class="line"><a name="l00306"></a><span class="lineno"> 306</span> <span class="comment">/* Less than. */</span></div>
<div class="line"><a name="l00307"></a><span class="lineno"> 307</span> <span class="preprocessor">#define JAS_FIX_LT(fix_t, fracbits, x, y) \</span></div>
<div class="line"><a name="l00308"></a><span class="lineno"> 308</span> <span class="preprocessor"> ((x) < (y))</span></div>
<div class="line"><a name="l00309"></a><span class="lineno"> 309</span> </div>
<div class="line"><a name="l00310"></a><span class="lineno"> 310</span> <span class="comment">/* Less than or equal. */</span></div>
<div class="line"><a name="l00311"></a><span class="lineno"> 311</span> <span class="preprocessor">#define JAS_FIX_LTE(fix_t, fracbits, x, y) \</span></div>
<div class="line"><a name="l00312"></a><span class="lineno"> 312</span> <span class="preprocessor"> ((x) <= (y))</span></div>
<div class="line"><a name="l00313"></a><span class="lineno"> 313</span> </div>
<div class="line"><a name="l00314"></a><span class="lineno"> 314</span> <span class="comment">/* Greater than. */</span></div>
<div class="line"><a name="l00315"></a><span class="lineno"> 315</span> <span class="preprocessor">#define JAS_FIX_GT(fix_t, fracbits, x, y) \</span></div>
<div class="line"><a name="l00316"></a><span class="lineno"> 316</span> <span class="preprocessor"> ((x) > (y))</span></div>
<div class="line"><a name="l00317"></a><span class="lineno"> 317</span> </div>
<div class="line"><a name="l00318"></a><span class="lineno"> 318</span> <span class="comment">/* Greater than or equal. */</span></div>
<div class="line"><a name="l00319"></a><span class="lineno"> 319</span> <span class="preprocessor">#define JAS_FIX_GTE(fix_t, fracbits, x, y) \</span></div>
<div class="line"><a name="l00320"></a><span class="lineno"> 320</span> <span class="preprocessor"> ((x) >= (y))</span></div>
<div class="line"><a name="l00321"></a><span class="lineno"> 321</span> </div>
<div class="line"><a name="l00322"></a><span class="lineno"> 322</span> <span class="comment">/******************************************************************************\</span></div>
<div class="line"><a name="l00323"></a><span class="lineno"> 323</span> <span class="comment">* Rounding functions.</span></div>
<div class="line"><a name="l00324"></a><span class="lineno"> 324</span> <span class="comment">\******************************************************************************/</span></div>
<div class="line"><a name="l00325"></a><span class="lineno"> 325</span> </div>
<div class="line"><a name="l00326"></a><span class="lineno"> 326</span> <span class="comment">/* Round a fixed-point number to the nearest integer. */</span></div>
<div class="line"><a name="l00327"></a><span class="lineno"> 327</span> <span class="preprocessor">#define JAS_FIX_ROUND(fix_t, fracbits, x) \</span></div>
<div class="line"><a name="l00328"></a><span class="lineno"> 328</span> <span class="preprocessor"> (((x) < 0) ? JAS_FIX_FLOOR(fix_t, fracbits, JAS_FIX_ADD(fix_t, fracbits, \</span></div>
<div class="line"><a name="l00329"></a><span class="lineno"> 329</span> <span class="preprocessor"> (x), JAS_FIX_HALF(fix_t, fracbits))) : \</span></div>
<div class="line"><a name="l00330"></a><span class="lineno"> 330</span> <span class="preprocessor"> JAS_FIX_NEG(fix_t, fracbits, JAS_FIX_FLOOR(fix_t, fracbits, \</span></div>
<div class="line"><a name="l00331"></a><span class="lineno"> 331</span> <span class="preprocessor"> JAS_FIX_ADD(fix_t, fracbits, (-(x)), JAS_FIX_HALF(fix_t, fracbits)))))</span></div>
<div class="line"><a name="l00332"></a><span class="lineno"> 332</span> </div>
<div class="line"><a name="l00333"></a><span class="lineno"> 333</span> <span class="comment">/* Round a fixed-point number to the nearest integer in the direction of</span></div>
<div class="line"><a name="l00334"></a><span class="lineno"> 334</span> <span class="comment"> negative infinity (i.e., the floor function). */</span></div>
<div class="line"><a name="l00335"></a><span class="lineno"> 335</span> <span class="preprocessor">#define JAS_FIX_FLOOR(fix_t, fracbits, x) \</span></div>
<div class="line"><a name="l00336"></a><span class="lineno"> 336</span> <span class="preprocessor"> ((x) & (~((JAS_CAST(fix_t, 1) << (fracbits)) - 1)))</span></div>
<div class="line"><a name="l00337"></a><span class="lineno"> 337</span> </div>
<div class="line"><a name="l00338"></a><span class="lineno"> 338</span> <span class="comment">/* Round a fixed-point number to the nearest integer in the direction</span></div>
<div class="line"><a name="l00339"></a><span class="lineno"> 339</span> <span class="comment"> of zero. */</span></div>
<div class="line"><a name="l00340"></a><span class="lineno"> 340</span> <span class="preprocessor">#define JAS_FIX_TRUNC(fix_t, fracbits, x) \</span></div>
<div class="line"><a name="l00341"></a><span class="lineno"> 341</span> <span class="preprocessor"> (((x) >= 0) ? JAS_FIX_FLOOR(fix_t, fracbits, x) : \</span></div>
<div class="line"><a name="l00342"></a><span class="lineno"> 342</span> <span class="preprocessor"> JAS_FIX_CEIL(fix_t, fracbits, x))</span></div>
<div class="line"><a name="l00343"></a><span class="lineno"> 343</span> </div>
<div class="line"><a name="l00344"></a><span class="lineno"> 344</span> <span class="comment">/******************************************************************************\</span></div>
<div class="line"><a name="l00345"></a><span class="lineno"> 345</span> <span class="comment">* The below macros are for internal library use only. Do not invoke them</span></div>
<div class="line"><a name="l00346"></a><span class="lineno"> 346</span> <span class="comment">* directly in application code.</span></div>
<div class="line"><a name="l00347"></a><span class="lineno"> 347</span> <span class="comment">\******************************************************************************/</span></div>
<div class="line"><a name="l00348"></a><span class="lineno"> 348</span> </div>
<div class="line"><a name="l00349"></a><span class="lineno"> 349</span> <span class="comment">/* Handle overflow. */</span></div>
<div class="line"><a name="l00350"></a><span class="lineno"> 350</span> <span class="preprocessor">#define JAS_FIX_OFLOW() \</span></div>
<div class="line"><a name="l00351"></a><span class="lineno"> 351</span> <span class="preprocessor"> jas_eprintf("overflow error: file %s, line %d\n", __FILE__, __LINE__)</span></div>
<div class="line"><a name="l00352"></a><span class="lineno"> 352</span> </div>
<div class="line"><a name="l00353"></a><span class="lineno"> 353</span> <span class="comment">/* Handle underflow. */</span></div>
<div class="line"><a name="l00354"></a><span class="lineno"> 354</span> <span class="preprocessor">#define JAS_FIX_UFLOW() \</span></div>
<div class="line"><a name="l00355"></a><span class="lineno"> 355</span> <span class="preprocessor"> jas_eprintf("underflow error: file %s, line %d\n", __FILE__, __LINE__)</span></div>
<div class="line"><a name="l00356"></a><span class="lineno"> 356</span> </div>
<div class="line"><a name="l00357"></a><span class="lineno"> 357</span> <span class="preprocessor">#ifdef __cplusplus</span></div>
<div class="line"><a name="l00358"></a><span class="lineno"> 358</span> }</div>
<div class="line"><a name="l00359"></a><span class="lineno"> 359</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00360"></a><span class="lineno"> 360</span> </div>
<div class="line"><a name="l00361"></a><span class="lineno"> 361</span> <span class="preprocessor">#endif</span></div>
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