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| <h1>include/core/SkFloatBits.h</h1><a href="_sk_float_bits_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span> |
| <a name="l00002"></a>00002 <span class="comment"> * Copyright (C) 2008 The Android Open Source Project</span> |
| <a name="l00003"></a>00003 <span class="comment"> *</span> |
| <a name="l00004"></a>00004 <span class="comment"> * Licensed under the Apache License, Version 2.0 (the "License");</span> |
| <a name="l00005"></a>00005 <span class="comment"> * you may not use this file except in compliance with the License.</span> |
| <a name="l00006"></a>00006 <span class="comment"> * You may obtain a copy of the License at</span> |
| <a name="l00007"></a>00007 <span class="comment"> *</span> |
| <a name="l00008"></a>00008 <span class="comment"> * http://www.apache.org/licenses/LICENSE-2.0</span> |
| <a name="l00009"></a>00009 <span class="comment"> *</span> |
| <a name="l00010"></a>00010 <span class="comment"> * Unless required by applicable law or agreed to in writing, software</span> |
| <a name="l00011"></a>00011 <span class="comment"> * distributed under the License is distributed on an "AS IS" BASIS,</span> |
| <a name="l00012"></a>00012 <span class="comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span> |
| <a name="l00013"></a>00013 <span class="comment"> * See the License for the specific language governing permissions and</span> |
| <a name="l00014"></a>00014 <span class="comment"> * limitations under the License.</span> |
| <a name="l00015"></a>00015 <span class="comment"> */</span> |
| <a name="l00016"></a>00016 |
| <a name="l00017"></a>00017 <span class="preprocessor">#ifndef SkFloatBits_DEFINED</span> |
| <a name="l00018"></a>00018 <span class="preprocessor"></span><span class="preprocessor">#define SkFloatBits_DEFINED</span> |
| <a name="l00019"></a>00019 <span class="preprocessor"></span> |
| <a name="l00020"></a>00020 <span class="preprocessor">#include "<a class="code" href="_sk_types_8h.html">SkTypes.h</a>"</span> |
| <a name="l00021"></a>00021 |
| <a name="l00026"></a>00026 <span class="keyword">static</span> <span class="keyword">inline</span> int32_t SkSignBitTo2sCompliment(int32_t x) { |
| <a name="l00027"></a>00027 <span class="keywordflow">if</span> (x < 0) { |
| <a name="l00028"></a>00028 x &= 0x7FFFFFFF; |
| <a name="l00029"></a>00029 x = -x; |
| <a name="l00030"></a>00030 } |
| <a name="l00031"></a>00031 <span class="keywordflow">return</span> x; |
| <a name="l00032"></a>00032 } |
| <a name="l00033"></a>00033 |
| <a name="l00037"></a>00037 <span class="keyword">static</span> <span class="keyword">inline</span> int32_t Sk2sComplimentToSignBit(int32_t x) { |
| <a name="l00038"></a>00038 <span class="keywordtype">int</span> sign = x >> 31; |
| <a name="l00039"></a>00039 <span class="comment">// make x positive</span> |
| <a name="l00040"></a>00040 x = (x ^ sign) - sign; |
| <a name="l00041"></a>00041 <span class="comment">// set the sign bit as needed</span> |
| <a name="l00042"></a>00042 x |= sign << 31; |
| <a name="l00043"></a>00043 <span class="keywordflow">return</span> x; |
| <a name="l00044"></a>00044 } |
| <a name="l00045"></a>00045 |
| <a name="l00049"></a>00049 int32_t <a class="code" href="_sk_float_bits_8h.html#a5a1bddef29a4cf566be3db61ec86254c">SkFloatBits_toIntCast</a>(int32_t floatBits); |
| <a name="l00050"></a>00050 |
| <a name="l00054"></a>00054 int32_t <a class="code" href="_sk_float_bits_8h.html#ab6913e07ef3f2504f73bff521dc83e85">SkFloatBits_toIntFloor</a>(int32_t floatBits); |
| <a name="l00055"></a>00055 |
| <a name="l00059"></a>00059 int32_t <a class="code" href="_sk_float_bits_8h.html#acd0af46b1e855899d0db79c512b83595">SkFloatBits_toIntRound</a>(int32_t floatBits); |
| <a name="l00060"></a>00060 |
| <a name="l00064"></a>00064 int32_t <a class="code" href="_sk_float_bits_8h.html#aaa4543b8daf73d7f6dccc7c799f27954">SkFloatBits_toIntCeil</a>(int32_t floatBits); |
| <a name="l00065"></a>00065 |
| <a name="l00066"></a>00066 |
| <a name="l00067"></a>00067 <span class="preprocessor">#ifdef SK_CAN_USE_FLOAT</span> |
| <a name="l00068"></a>00068 <span class="preprocessor"></span> |
| <a name="l00069"></a>00069 <span class="keyword">union </span>SkFloatIntUnion { |
| <a name="l00070"></a>00070 <span class="keywordtype">float</span> fFloat; |
| <a name="l00071"></a>00071 int32_t fSignBitInt; |
| <a name="l00072"></a>00072 }; |
| <a name="l00073"></a>00073 |
| <a name="l00074"></a>00074 <span class="comment">// Helper to see a float as its bit pattern (w/o aliasing warnings)</span> |
| <a name="l00075"></a>00075 <span class="keyword">static</span> <span class="keyword">inline</span> int32_t SkFloat2Bits(<span class="keywordtype">float</span> x) { |
| <a name="l00076"></a>00076 SkFloatIntUnion data; |
| <a name="l00077"></a>00077 data.fFloat = x; |
| <a name="l00078"></a>00078 <span class="keywordflow">return</span> data.fSignBitInt; |
| <a name="l00079"></a>00079 } |
| <a name="l00080"></a>00080 |
| <a name="l00081"></a>00081 <span class="comment">// Helper to see a bit pattern as a float (w/o aliasing warnings)</span> |
| <a name="l00082"></a>00082 <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">float</span> SkBits2Float(int32_t floatAsBits) { |
| <a name="l00083"></a>00083 SkFloatIntUnion data; |
| <a name="l00084"></a>00084 data.fSignBitInt = floatAsBits; |
| <a name="l00085"></a>00085 <span class="keywordflow">return</span> data.fFloat; |
| <a name="l00086"></a>00086 } |
| <a name="l00087"></a>00087 |
| <a name="l00093"></a>00093 <span class="keyword">static</span> <span class="keyword">inline</span> int32_t SkFloatAs2sCompliment(<span class="keywordtype">float</span> x) { |
| <a name="l00094"></a>00094 <span class="keywordflow">return</span> SkSignBitTo2sCompliment(SkFloat2Bits(x)); |
| <a name="l00095"></a>00095 } |
| <a name="l00096"></a>00096 |
| <a name="l00100"></a>00100 <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">float</span> Sk2sComplimentAsFloat(int32_t x) { |
| <a name="l00101"></a>00101 <span class="keywordflow">return</span> SkBits2Float(Sk2sComplimentToSignBit(x)); |
| <a name="l00102"></a>00102 } |
| <a name="l00103"></a>00103 |
| <a name="l00106"></a>00106 <span class="keywordtype">float</span> SkIntToFloatCast(<span class="keywordtype">int</span> x); |
| <a name="l00107"></a>00107 <span class="keywordtype">float</span> SkIntToFloatCast_NoOverflowCheck(<span class="keywordtype">int</span> x); |
| <a name="l00108"></a>00108 |
| <a name="l00112"></a>00112 <span class="keyword">static</span> <span class="keyword">inline</span> int32_t SkFloatToIntCast(<span class="keywordtype">float</span> x) { |
| <a name="l00113"></a>00113 <span class="keywordflow">return</span> <a class="code" href="_sk_float_bits_8h.html#a5a1bddef29a4cf566be3db61ec86254c">SkFloatBits_toIntCast</a>(SkFloat2Bits(x)); |
| <a name="l00114"></a>00114 } |
| <a name="l00115"></a>00115 |
| <a name="l00119"></a>00119 <span class="keyword">static</span> <span class="keyword">inline</span> int32_t SkFloatToIntFloor(<span class="keywordtype">float</span> x) { |
| <a name="l00120"></a>00120 <span class="keywordflow">return</span> <a class="code" href="_sk_float_bits_8h.html#ab6913e07ef3f2504f73bff521dc83e85">SkFloatBits_toIntFloor</a>(SkFloat2Bits(x)); |
| <a name="l00121"></a>00121 } |
| <a name="l00122"></a>00122 |
| <a name="l00126"></a>00126 <span class="keyword">static</span> <span class="keyword">inline</span> int32_t SkFloatToIntRound(<span class="keywordtype">float</span> x) { |
| <a name="l00127"></a>00127 <span class="keywordflow">return</span> <a class="code" href="_sk_float_bits_8h.html#acd0af46b1e855899d0db79c512b83595">SkFloatBits_toIntRound</a>(SkFloat2Bits(x)); |
| <a name="l00128"></a>00128 } |
| <a name="l00129"></a>00129 |
| <a name="l00133"></a>00133 <span class="keyword">static</span> <span class="keyword">inline</span> int32_t SkFloatToIntCeil(<span class="keywordtype">float</span> x) { |
| <a name="l00134"></a>00134 <span class="keywordflow">return</span> <a class="code" href="_sk_float_bits_8h.html#aaa4543b8daf73d7f6dccc7c799f27954">SkFloatBits_toIntCeil</a>(SkFloat2Bits(x)); |
| <a name="l00135"></a>00135 } |
| <a name="l00136"></a>00136 |
| <a name="l00137"></a>00137 <span class="preprocessor">#endif</span> |
| <a name="l00138"></a>00138 <span class="preprocessor"></span> |
| <a name="l00139"></a>00139 <span class="comment">// Scalar wrappers for float-bit routines</span> |
| <a name="l00140"></a>00140 |
| <a name="l00141"></a>00141 <span class="preprocessor">#ifdef SK_SCALAR_IS_FLOAT</span> |
| <a name="l00142"></a>00142 <span class="preprocessor"></span><span class="preprocessor"> #define SkScalarAs2sCompliment(x) SkFloatAs2sCompliment(x)</span> |
| <a name="l00143"></a>00143 <span class="preprocessor"></span><span class="preprocessor"> #define Sk2sComplimentAsScalar(x) Sk2sComplimentAsFloat(x)</span> |
| <a name="l00144"></a>00144 <span class="preprocessor"></span><span class="preprocessor">#else</span> |
| <a name="l00145"></a><a class="code" href="_sk_float_bits_8h.html#aa56605c83e06429ae8ca757be67063e3">00145</a> <span class="preprocessor"></span><span class="preprocessor"> #define SkScalarAs2sCompliment(x) (x)</span> |
| <a name="l00146"></a><a class="code" href="_sk_float_bits_8h.html#a806e863e38958294c7a95589b2ce5493">00146</a> <span class="preprocessor"></span><span class="preprocessor"> #define Sk2sComplimentAsScalar(x) (x)</span> |
| <a name="l00147"></a>00147 <span class="preprocessor"></span><span class="preprocessor">#endif</span> |
| <a name="l00148"></a>00148 <span class="preprocessor"></span> |
| <a name="l00149"></a>00149 <span class="preprocessor">#endif</span> |
| <a name="l00150"></a>00150 <span class="preprocessor"></span> |
| </pre></div></div> |
| <hr size="1"/><address style="text-align: right;"><small>Generated on Tue Oct 20 11:03:40 2009 for Skia by |
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| <img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.6.1 </small></address> |
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