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| <h1>include/core/SkFixed.h</h1><a href="_sk_fixed_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) 2006 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 SkFixed_DEFINED</span> |
| <a name="l00018"></a>00018 <span class="preprocessor"></span><span class="preprocessor">#define SkFixed_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="l00029"></a><a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">00029</a> <span class="keyword">typedef</span> int32_t <a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a>; |
| <a name="l00030"></a><a class="code" href="_sk_fixed_8h.html#a57cf4d6e7ae16b17b2a99dc2eb70b138">00030</a> <span class="preprocessor">#define SK_Fixed1 (1 << 16)</span> |
| <a name="l00031"></a><a class="code" href="_sk_fixed_8h.html#a86ff599f2230dc54366f4fb38c0db3a8">00031</a> <span class="preprocessor"></span><span class="preprocessor">#define SK_FixedHalf (1 << 15)</span> |
| <a name="l00032"></a><a class="code" href="_sk_fixed_8h.html#acfca27d22beb012d2796bad7d3b2c1b2">00032</a> <span class="preprocessor"></span><span class="preprocessor">#define SK_FixedMax (0x7FFFFFFF)</span> |
| <a name="l00033"></a><a class="code" href="_sk_fixed_8h.html#acdb66554de094d9fb6454ecb37bd9e68">00033</a> <span class="preprocessor"></span><span class="preprocessor">#define SK_FixedMin (0x1)</span> |
| <a name="l00034"></a><a class="code" href="_sk_fixed_8h.html#aa273543c9e2b1009177dee27f259c6a1">00034</a> <span class="preprocessor"></span><span class="preprocessor">#define SK_FixedNaN ((int) 0x80000000)</span> |
| <a name="l00035"></a><a class="code" href="_sk_fixed_8h.html#a3f34032aad581143f905d70312a2452d">00035</a> <span class="preprocessor"></span><span class="preprocessor">#define SK_FixedPI (0x3243F)</span> |
| <a name="l00036"></a><a class="code" href="_sk_fixed_8h.html#af14300beab41b3a0328ce1077954a710">00036</a> <span class="preprocessor"></span><span class="preprocessor">#define SK_FixedSqrt2 (92682)</span> |
| <a name="l00037"></a><a class="code" href="_sk_fixed_8h.html#add732878677ace643c2896ca921806c1">00037</a> <span class="preprocessor"></span><span class="preprocessor">#define SK_FixedTanPIOver8 (0x6A0A)</span> |
| <a name="l00038"></a><a class="code" href="_sk_fixed_8h.html#a3c599dd04825f349d8d2d0c7b4da0c2d">00038</a> <span class="preprocessor"></span><span class="preprocessor">#define SK_FixedRoot2Over2 (0xB505)</span> |
| <a name="l00039"></a>00039 <span class="preprocessor"></span> |
| <a name="l00040"></a>00040 <span class="preprocessor">#ifdef SK_CAN_USE_FLOAT</span> |
| <a name="l00041"></a>00041 <span class="preprocessor"></span><span class="preprocessor"> #define SkFixedToFloat(x) ((x) * 1.5258789e-5f)</span> |
| <a name="l00042"></a>00042 <span class="preprocessor"></span><span class="preprocessor"> #define SkFloatToFixed(x) ((SkFixed)((x) * SK_Fixed1))</span> |
| <a name="l00043"></a>00043 <span class="preprocessor"></span> |
| <a name="l00044"></a>00044 <span class="preprocessor"> #define SkFixedToDouble(x) ((x) * 1.5258789e-5)</span> |
| <a name="l00045"></a>00045 <span class="preprocessor"></span><span class="preprocessor"> #define SkDoubleToFixed(x) ((SkFixed)((x) * SK_Fixed1))</span> |
| <a name="l00046"></a>00046 <span class="preprocessor"></span><span class="preprocessor">#endif</span> |
| <a name="l00047"></a>00047 <span class="preprocessor"></span> |
| <a name="l00050"></a><a class="code" href="_sk_fixed_8h.html#a6d0de01bbaf83f12dfa75c6f62c6a191">00050</a> <span class="keyword">typedef</span> int32_t <a class="code" href="_sk_fixed_8h.html#a6d0de01bbaf83f12dfa75c6f62c6a191">SkFract</a>; |
| <a name="l00051"></a><a class="code" href="_sk_fixed_8h.html#ac0fb660eeb278eb8d832f404ddb9d551">00051</a> <span class="preprocessor">#define SK_Fract1 (1 << 30)</span> |
| <a name="l00052"></a><a class="code" href="_sk_fixed_8h.html#a89e01ff3b581cb26ef37aca7b96e46c3">00052</a> <span class="preprocessor"></span><span class="preprocessor">#define Sk_FracHalf (1 << 29)</span> |
| <a name="l00053"></a><a class="code" href="_sk_fixed_8h.html#a6e5b87a258096626b418c5d5ab0e50c5">00053</a> <span class="preprocessor"></span><span class="preprocessor">#define SK_FractPIOver180 (0x11DF46A)</span> |
| <a name="l00054"></a>00054 <span class="preprocessor"></span> |
| <a name="l00055"></a>00055 <span class="preprocessor">#ifdef SK_CAN_USE_FLOAT</span> |
| <a name="l00056"></a>00056 <span class="preprocessor"></span><span class="preprocessor"> #define SkFractToFloat(x) ((float)(x) * 0.00000000093132257f)</span> |
| <a name="l00057"></a>00057 <span class="preprocessor"></span><span class="preprocessor"> #define SkFloatToFract(x) ((SkFract)((x) * SK_Fract1))</span> |
| <a name="l00058"></a>00058 <span class="preprocessor"></span><span class="preprocessor">#endif</span> |
| <a name="l00059"></a>00059 <span class="preprocessor"></span> |
| <a name="l00063"></a>00063 <span class="preprocessor">#ifdef SK_DEBUG</span> |
| <a name="l00064"></a>00064 <span class="preprocessor"></span> <span class="keyword">inline</span> <a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> <a class="code" href="_sk_fixed_8h.html#a7d86f19b08461375de282d223fa35f65">SkIntToFixed</a>(<span class="keywordtype">int</span> n) |
| <a name="l00065"></a>00065 { |
| <a name="l00066"></a>00066 <a class="code" href="_sk_types_8h.html#acc82ca88a67ae7ce95a107a9a4b81123">SkASSERT</a>(n >= -32768 && n <= 32767); |
| <a name="l00067"></a>00067 <span class="keywordflow">return</span> n << 16; |
| <a name="l00068"></a>00068 } |
| <a name="l00069"></a>00069 <span class="preprocessor">#else</span> |
| <a name="l00070"></a>00070 <span class="preprocessor"></span> <span class="comment">// force the cast to SkFixed to ensure that the answer is signed (like the debug version)</span> |
| <a name="l00071"></a><a class="code" href="_sk_fixed_8h.html#a7d86f19b08461375de282d223fa35f65">00071</a> <span class="preprocessor"> #define SkIntToFixed(n) (SkFixed)((n) << 16)</span> |
| <a name="l00072"></a>00072 <span class="preprocessor"></span><span class="preprocessor">#endif</span> |
| <a name="l00073"></a>00073 <span class="preprocessor"></span> |
| <a name="l00077"></a>00077 <span class="preprocessor">#ifdef SK_DEBUG</span> |
| <a name="l00078"></a>00078 <span class="preprocessor"></span> <span class="keyword">inline</span> <a class="code" href="_sk_fixed_8h.html#a6d0de01bbaf83f12dfa75c6f62c6a191">SkFract</a> <a class="code" href="_sk_fixed_8h.html#a3081ff66815fa847ab36c7763d25b5aa">SkFixedToFract</a>(<a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> x) |
| <a name="l00079"></a>00079 { |
| <a name="l00080"></a>00080 <a class="code" href="_sk_types_8h.html#acc82ca88a67ae7ce95a107a9a4b81123">SkASSERT</a>(x >= (-2 << 16) && x <= (2 << 16) - 1); |
| <a name="l00081"></a>00081 <span class="keywordflow">return</span> x << 14; |
| <a name="l00082"></a>00082 } |
| <a name="l00083"></a>00083 <span class="preprocessor">#else</span> |
| <a name="l00084"></a><a class="code" href="_sk_fixed_8h.html#a3081ff66815fa847ab36c7763d25b5aa">00084</a> <span class="preprocessor"></span><span class="preprocessor"> #define SkFixedToFract(x) ((x) << 14)</span> |
| <a name="l00085"></a>00085 <span class="preprocessor"></span><span class="preprocessor">#endif</span> |
| <a name="l00086"></a>00086 <span class="preprocessor"></span> |
| <a name="l00089"></a><a class="code" href="_sk_fixed_8h.html#ac5197db8c7979076aed6804125f01da0">00089</a> <span class="keyword">inline</span> <a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> <a class="code" href="_sk_fixed_8h.html#ac5197db8c7979076aed6804125f01da0">SkFixedFraction</a>(<a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> x) |
| <a name="l00090"></a>00090 { |
| <a name="l00091"></a>00091 <a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> mask = x >> 31 << 16; |
| <a name="l00092"></a>00092 <span class="keywordflow">return</span> (x & 0xFFFF) | mask; |
| <a name="l00093"></a>00093 } |
| <a name="l00094"></a>00094 |
| <a name="l00097"></a><a class="code" href="_sk_fixed_8h.html#aae6e1d890832cbfc5a9c180f4b7339f5">00097</a> <span class="preprocessor">#define SkFractToFixed(x) ((x) >> 14)</span> |
| <a name="l00098"></a>00098 <span class="preprocessor"></span> |
| <a name="l00100"></a><a class="code" href="_sk_fixed_8h.html#a44d1862c1b022b8423fa71e6bd4c835a">00100</a> <span class="preprocessor">#define SkFixedRound(x) (((x) + SK_FixedHalf) >> 16)</span> |
| <a name="l00101"></a><a class="code" href="_sk_fixed_8h.html#a8d49ee75961a1a29f5e91e4ca07d0b4c">00101</a> <span class="preprocessor"></span><span class="preprocessor">#define SkFixedCeil(x) (((x) + SK_Fixed1 - 1) >> 16)</span> |
| <a name="l00102"></a><a class="code" href="_sk_fixed_8h.html#ab37a18a680fbdc254a9640d87f68536e">00102</a> <span class="preprocessor"></span><span class="preprocessor">#define SkFixedFloor(x) ((x) >> 16)</span> |
| <a name="l00103"></a><a class="code" href="_sk_fixed_8h.html#a30f761be1599e9a4197b5033a54c430b">00103</a> <span class="preprocessor"></span><span class="preprocessor">#define SkFixedAbs(x) SkAbs32(x)</span> |
| <a name="l00104"></a><a class="code" href="_sk_fixed_8h.html#a988204e9a6f3538fdb66bc184b623565">00104</a> <span class="preprocessor"></span><span class="preprocessor">#define SkFixedAve(a, b) (((a) + (b)) >> 1)</span> |
| <a name="l00105"></a>00105 <span class="preprocessor"></span> |
| <a name="l00106"></a>00106 <a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> <a class="code" href="_sk_fixed_8h.html#ab99fe11d9cb2ff7a96d88b6a5d67497c">SkFixedMul_portable</a>(<a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a>, <a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a>); |
| <a name="l00107"></a>00107 <a class="code" href="_sk_fixed_8h.html#a6d0de01bbaf83f12dfa75c6f62c6a191">SkFract</a> <a class="code" href="_sk_fixed_8h.html#ae8275558548133752adb781083360eb5">SkFractMul_portable</a>(<a class="code" href="_sk_fixed_8h.html#a6d0de01bbaf83f12dfa75c6f62c6a191">SkFract</a>, <a class="code" href="_sk_fixed_8h.html#a6d0de01bbaf83f12dfa75c6f62c6a191">SkFract</a>); |
| <a name="l00108"></a><a class="code" href="_sk_fixed_8h.html#a94af5b1fae8e77097c5d09b571b94894">00108</a> <span class="keyword">inline</span> <a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> <a class="code" href="_sk_fixed_8h.html#a94af5b1fae8e77097c5d09b571b94894">SkFixedSquare_portable</a>(<a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> value) |
| <a name="l00109"></a>00109 { |
| <a name="l00110"></a>00110 uint32_t a = SkAbs32(value); |
| <a name="l00111"></a>00111 uint32_t ah = a >> 16; |
| <a name="l00112"></a>00112 uint32_t al = a & 0xFFFF; |
| <a name="l00113"></a>00113 <span class="keywordflow">return</span> ah * a + al * ah + (al * al >> 16); |
| <a name="l00114"></a>00114 } |
| <a name="l00115"></a>00115 |
| <a name="l00116"></a><a class="code" href="_sk_fixed_8h.html#a7b050fb71a37e35bd75412de9a176020">00116</a> <span class="preprocessor">#define SkFixedDiv(numer, denom) SkDivBits(numer, denom, 16)</span> |
| <a name="l00117"></a>00117 <span class="preprocessor"></span><a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> <a class="code" href="_sk_fixed_8h.html#a9acc00db9068bce447465e10e1b5b713">SkFixedDivInt</a>(int32_t numer, int32_t denom); |
| <a name="l00118"></a>00118 <a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> <a class="code" href="_sk_fixed_8h.html#a4217a03321915ac35bfcca7b335edc76">SkFixedMod</a>(<a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> numer, <a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> denom); |
| <a name="l00119"></a><a class="code" href="_sk_fixed_8h.html#aeb77faf51fde52ec28714b65c09327ff">00119</a> <span class="preprocessor">#define SkFixedInvert(n) SkDivBits(SK_Fixed1, n, 16)</span> |
| <a name="l00120"></a>00120 <span class="preprocessor"></span><a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> <a class="code" href="_sk_fixed_8h.html#aa02e804cf4f776de9144fbdc908a8c1b">SkFixedFastInvert</a>(<a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> n); |
| <a name="l00121"></a><a class="code" href="_sk_fixed_8h.html#aa63ddba7916cc8142a5c5a74870da078">00121</a> <span class="preprocessor">#define SkFixedSqrt(n) SkSqrtBits(n, 23)</span> |
| <a name="l00122"></a>00122 <span class="preprocessor"></span><a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> <a class="code" href="_sk_fixed_8h.html#a5c3bb0b29e39217f5f512816d5dd2927">SkFixedMean</a>(<a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> a, <a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> b); <span class="comment">//*< returns sqrt(x*y)</span> |
| <a name="l00123"></a>00123 <span class="keywordtype">int</span> <a class="code" href="_sk_fixed_8h.html#a2369a8bca83310d1090874a4229ee8bd">SkFixedMulCommon</a>(<a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a>, <span class="keywordtype">int</span> , <span class="keywordtype">int</span> bias); <span class="comment">// internal used by SkFixedMulFloor, SkFixedMulCeil, SkFixedMulRound</span> |
| <a name="l00124"></a>00124 |
| <a name="l00125"></a><a class="code" href="_sk_fixed_8h.html#a785ae01ee9468f908b4c805f8faf3f06">00125</a> <span class="preprocessor">#define SkFractDiv(numer, denom) SkDivBits(numer, denom, 30)</span> |
| <a name="l00126"></a><a class="code" href="_sk_fixed_8h.html#a1246dc490df3142e219d530ed52d3a99">00126</a> <span class="preprocessor"></span><span class="preprocessor">#define SkFractSqrt(n) SkSqrtBits(n, 30)</span> |
| <a name="l00127"></a>00127 <span class="preprocessor"></span> |
| <a name="l00128"></a>00128 <a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> <a class="code" href="_sk_fixed_8h.html#ac9e9f2d1a186eae6d842d893a41da173">SkFixedSinCos</a>(<a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> radians, <a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a>* cosValueOrNull); |
| <a name="l00129"></a><a class="code" href="_sk_fixed_8h.html#a0bf73cb924603b74e5da425636f75781">00129</a> <span class="preprocessor">#define SkFixedSin(radians) SkFixedSinCos(radians, NULL)</span> |
| <a name="l00130"></a><a class="code" href="_sk_fixed_8h.html#ab7682acdc97b2bf0c668109eb37e6e39">00130</a> <span class="preprocessor"></span><span class="keyword">inline</span> <a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> <a class="code" href="_sk_fixed_8h.html#ab7682acdc97b2bf0c668109eb37e6e39">SkFixedCos</a>(<a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> radians) |
| <a name="l00131"></a>00131 { |
| <a name="l00132"></a>00132 <a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> cosValue; |
| <a name="l00133"></a>00133 (void)<a class="code" href="_sk_fixed_8h.html#ac9e9f2d1a186eae6d842d893a41da173">SkFixedSinCos</a>(radians, &cosValue); |
| <a name="l00134"></a>00134 <span class="keywordflow">return</span> cosValue; |
| <a name="l00135"></a>00135 } |
| <a name="l00136"></a>00136 <a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> <a class="code" href="_sk_fixed_8h.html#a9918b8f37871e4dec9607db7a8d1e275">SkFixedTan</a>(<a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> radians); |
| <a name="l00137"></a>00137 <a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> <a class="code" href="_sk_fixed_8h.html#a18ef7f4146d798593438ad727fe525d7">SkFixedASin</a>(<a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a>); |
| <a name="l00138"></a>00138 <a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> <a class="code" href="_sk_fixed_8h.html#ad6ebd3112d8a4f6397a24acfa616ed54">SkFixedACos</a>(<a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a>); |
| <a name="l00139"></a>00139 <a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> <a class="code" href="_sk_fixed_8h.html#a9580c55f1d58fb4b7149849ce0ee6133">SkFixedATan2</a>(<a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> y, <a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> x); |
| <a name="l00140"></a>00140 <a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> <a class="code" href="_sk_fixed_8h.html#add15d9a0d256ab4955f347a0b04f6fea">SkFixedExp</a>(<a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a>); |
| <a name="l00141"></a>00141 <a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> <a class="code" href="_sk_fixed_8h.html#a86892042dea1801bd826b4e2ef87af3f">SkFixedLog</a>(<a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a>); |
| <a name="l00142"></a>00142 |
| <a name="l00143"></a><a class="code" href="_sk_fixed_8h.html#afbf469f1fa1cd77a67b5127f9c2b8bce">00143</a> <span class="preprocessor">#define SK_FixedNearlyZero (SK_Fixed1 >> 12)</span> |
| <a name="l00144"></a>00144 <span class="preprocessor"></span> |
| <a name="l00145"></a><a class="code" href="_sk_fixed_8h.html#a7f2c313a0c180cd260f64715ab7535b1">00145</a> <span class="keyword">inline</span> <span class="keywordtype">bool</span> <a class="code" href="_sk_fixed_8h.html#a7f2c313a0c180cd260f64715ab7535b1">SkFixedNearlyZero</a>(<a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> x, <a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> tolerance = <a class="code" href="_sk_fixed_8h.html#afbf469f1fa1cd77a67b5127f9c2b8bce">SK_FixedNearlyZero</a>) |
| <a name="l00146"></a>00146 { |
| <a name="l00147"></a>00147 <a class="code" href="_sk_types_8h.html#acc82ca88a67ae7ce95a107a9a4b81123">SkASSERT</a>(tolerance > 0); |
| <a name="l00148"></a>00148 <span class="keywordflow">return</span> SkAbs32(x) < tolerance; |
| <a name="l00149"></a>00149 } |
| <a name="l00150"></a>00150 |
| <a name="l00152"></a>00152 <span class="comment">// Now look for ASM overrides for our portable versions (should consider putting this in its own file)</span> |
| <a name="l00153"></a>00153 |
| <a name="l00154"></a>00154 <span class="preprocessor">#ifdef SkLONGLONG</span> |
| <a name="l00155"></a>00155 <span class="preprocessor"></span> <span class="keyword">inline</span> <a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> SkFixedMul_longlong(<a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> a, <a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> b) |
| <a name="l00156"></a>00156 { |
| <a name="l00157"></a>00157 <span class="keywordflow">return</span> (<a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a>)((SkLONGLONG)a * b >> 16); |
| <a name="l00158"></a>00158 } |
| <a name="l00159"></a>00159 <span class="keyword">inline</span> <a class="code" href="_sk_fixed_8h.html#a6d0de01bbaf83f12dfa75c6f62c6a191">SkFract</a> SkFractMul_longlong(<a class="code" href="_sk_fixed_8h.html#a6d0de01bbaf83f12dfa75c6f62c6a191">SkFract</a> a, <a class="code" href="_sk_fixed_8h.html#a6d0de01bbaf83f12dfa75c6f62c6a191">SkFract</a> b) |
| <a name="l00160"></a>00160 { |
| <a name="l00161"></a>00161 <span class="keywordflow">return</span> (<a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a>)((SkLONGLONG)a * b >> 30); |
| <a name="l00162"></a>00162 } |
| <a name="l00163"></a>00163 <span class="keyword">inline</span> <a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> SkFixedSquare_longlong(<a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> value) |
| <a name="l00164"></a>00164 { |
| <a name="l00165"></a>00165 <span class="keywordflow">return</span> (<a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a>)((SkLONGLONG)value * value >> 16); |
| <a name="l00166"></a>00166 } |
| <a name="l00167"></a>00167 <span class="preprocessor"> #define SkFixedMul(a,b) SkFixedMul_longlong(a,b)</span> |
| <a name="l00168"></a>00168 <span class="preprocessor"></span><span class="preprocessor"> #define SkFractMul(a,b) SkFractMul_longlong(a,b)</span> |
| <a name="l00169"></a>00169 <span class="preprocessor"></span><span class="preprocessor"> #define SkFixedSquare(a) SkFixedSquare_longlong(a)</span> |
| <a name="l00170"></a>00170 <span class="preprocessor"></span><span class="preprocessor">#endif</span> |
| <a name="l00171"></a>00171 <span class="preprocessor"></span> |
| <a name="l00172"></a>00172 <span class="preprocessor">#if defined(__arm__) && !defined(__thumb__)</span> |
| <a name="l00173"></a>00173 <span class="preprocessor"></span> <span class="comment">/* This guy does not handle NaN or other obscurities, but is faster than</span> |
| <a name="l00174"></a>00174 <span class="comment"> than (int)(x*65536) when we only have software floats</span> |
| <a name="l00175"></a>00175 <span class="comment"> */</span> |
| <a name="l00176"></a>00176 <span class="keyword">inline</span> <a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> SkFloatToFixed_arm(<span class="keywordtype">float</span> x) |
| <a name="l00177"></a>00177 { |
| <a name="l00178"></a>00178 <span class="keyword">register</span> int32_t y, z; |
| <a name="l00179"></a>00179 <span class="keyword">asm</span>(<span class="stringliteral">"movs %1, %3, lsl #1 \n"</span> |
| <a name="l00180"></a>00180 <span class="stringliteral">"mov %2, #0x8E \n"</span> |
| <a name="l00181"></a>00181 <span class="stringliteral">"sub %1, %2, %1, lsr #24 \n"</span> |
| <a name="l00182"></a>00182 <span class="stringliteral">"mov %2, %3, lsl #8 \n"</span> |
| <a name="l00183"></a>00183 <span class="stringliteral">"orr %2, %2, #0x80000000 \n"</span> |
| <a name="l00184"></a>00184 <span class="stringliteral">"mov %1, %2, lsr %1 \n"</span> |
| <a name="l00185"></a>00185 <span class="stringliteral">"rsbcs %1, %1, #0 \n"</span> |
| <a name="l00186"></a>00186 : <span class="stringliteral">"=r"</span>(x), <span class="stringliteral">"=&r"</span>(y), <span class="stringliteral">"=&r"</span>(z) |
| <a name="l00187"></a>00187 : <span class="stringliteral">"r"</span>(x) |
| <a name="l00188"></a>00188 : <span class="stringliteral">"cc"</span> |
| <a name="l00189"></a>00189 ); |
| <a name="l00190"></a>00190 <span class="keywordflow">return</span> y; |
| <a name="l00191"></a>00191 } |
| <a name="l00192"></a>00192 <span class="keyword">inline</span> <a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> SkFixedMul_arm(<a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> x, <a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> y) |
| <a name="l00193"></a>00193 { |
| <a name="l00194"></a>00194 <span class="keyword">register</span> int32_t t; |
| <a name="l00195"></a>00195 <span class="keyword">asm</span>(<span class="stringliteral">"smull %0, %2, %1, %3 \n"</span> |
| <a name="l00196"></a>00196 <span class="stringliteral">"mov %0, %0, lsr #16 \n"</span> |
| <a name="l00197"></a>00197 <span class="stringliteral">"orr %0, %0, %2, lsl #16 \n"</span> |
| <a name="l00198"></a>00198 : <span class="stringliteral">"=r"</span>(x), <span class="stringliteral">"=&r"</span>(y), <span class="stringliteral">"=r"</span>(t) |
| <a name="l00199"></a>00199 : <span class="stringliteral">"r"</span>(x), <span class="stringliteral">"1"</span>(y) |
| <a name="l00200"></a>00200 : |
| <a name="l00201"></a>00201 ); |
| <a name="l00202"></a>00202 <span class="keywordflow">return</span> x; |
| <a name="l00203"></a>00203 } |
| <a name="l00204"></a>00204 <span class="keyword">inline</span> <a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> SkFixedMulAdd_arm(<a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> x, <a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> y, <a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> a) |
| <a name="l00205"></a>00205 { |
| <a name="l00206"></a>00206 <span class="keyword">register</span> int32_t t; |
| <a name="l00207"></a>00207 <span class="keyword">asm</span>(<span class="stringliteral">"smull %0, %3, %1, %4 \n"</span> |
| <a name="l00208"></a>00208 <span class="stringliteral">"add %0, %2, %0, lsr #16 \n"</span> |
| <a name="l00209"></a>00209 <span class="stringliteral">"add %0, %0, %3, lsl #16 \n"</span> |
| <a name="l00210"></a>00210 : <span class="stringliteral">"=r"</span>(x), <span class="stringliteral">"=&r"</span>(y), <span class="stringliteral">"=&r"</span>(a), <span class="stringliteral">"=r"</span>(t) |
| <a name="l00211"></a>00211 : <span class="stringliteral">"%r"</span>(x), <span class="stringliteral">"1"</span>(y), <span class="stringliteral">"2"</span>(a) |
| <a name="l00212"></a>00212 : |
| <a name="l00213"></a>00213 ); |
| <a name="l00214"></a>00214 <span class="keywordflow">return</span> x; |
| <a name="l00215"></a>00215 } |
| <a name="l00216"></a>00216 <span class="keyword">inline</span> <a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> SkFractMul_arm(<a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> x, <a class="code" href="_sk_fixed_8h.html#a2f208c049f1e9eb4d35b8c47615f5c47">SkFixed</a> y) |
| <a name="l00217"></a>00217 { |
| <a name="l00218"></a>00218 <span class="keyword">register</span> int32_t t; |
| <a name="l00219"></a>00219 <span class="keyword">asm</span>(<span class="stringliteral">"smull %0, %2, %1, %3 \n"</span> |
| <a name="l00220"></a>00220 <span class="stringliteral">"mov %0, %0, lsr #30 \n"</span> |
| <a name="l00221"></a>00221 <span class="stringliteral">"orr %0, %0, %2, lsl #2 \n"</span> |
| <a name="l00222"></a>00222 : <span class="stringliteral">"=r"</span>(x), <span class="stringliteral">"=&r"</span>(y), <span class="stringliteral">"=r"</span>(t) |
| <a name="l00223"></a>00223 : <span class="stringliteral">"r"</span>(x), <span class="stringliteral">"1"</span>(y) |
| <a name="l00224"></a>00224 : |
| <a name="l00225"></a>00225 ); |
| <a name="l00226"></a>00226 <span class="keywordflow">return</span> x; |
| <a name="l00227"></a>00227 } |
| <a name="l00228"></a>00228 <span class="preprocessor"> #undef SkFixedMul</span> |
| <a name="l00229"></a>00229 <span class="preprocessor"></span><span class="preprocessor"> #undef SkFractMul</span> |
| <a name="l00230"></a>00230 <span class="preprocessor"></span><span class="preprocessor"> #define SkFixedMul(x, y) SkFixedMul_arm(x, y)</span> |
| <a name="l00231"></a>00231 <span class="preprocessor"></span><span class="preprocessor"> #define SkFractMul(x, y) SkFractMul_arm(x, y)</span> |
| <a name="l00232"></a>00232 <span class="preprocessor"></span><span class="preprocessor"> #define SkFixedMulAdd(x, y, a) SkFixedMulAdd_arm(x, y, a)</span> |
| <a name="l00233"></a>00233 <span class="preprocessor"></span> |
| <a name="l00234"></a>00234 <span class="preprocessor"> #undef SkFloatToFixed</span> |
| <a name="l00235"></a>00235 <span class="preprocessor"></span><span class="preprocessor"> #define SkFloatToFixed(x) SkFloatToFixed_arm(x)</span> |
| <a name="l00236"></a>00236 <span class="preprocessor"></span><span class="preprocessor">#endif</span> |
| <a name="l00237"></a>00237 <span class="preprocessor"></span> |
| <a name="l00239"></a>00239 |
| <a name="l00240"></a>00240 <span class="preprocessor">#ifndef SkFixedSquare</span> |
| <a name="l00241"></a><a class="code" href="_sk_fixed_8h.html#a4672e486c3640e91d293b2295ada4b34">00241</a> <span class="preprocessor"></span><span class="preprocessor"> #define SkFixedSquare(x) SkFixedSquare_portable(x)</span> |
| <a name="l00242"></a>00242 <span class="preprocessor"></span><span class="preprocessor">#endif</span> |
| <a name="l00243"></a>00243 <span class="preprocessor"></span><span class="preprocessor">#ifndef SkFixedMul</span> |
| <a name="l00244"></a><a class="code" href="_sk_fixed_8h.html#a46188b5094b63f6999ac42b4f605f640">00244</a> <span class="preprocessor"></span><span class="preprocessor"> #define SkFixedMul(x, y) SkFixedMul_portable(x, y)</span> |
| <a name="l00245"></a>00245 <span class="preprocessor"></span><span class="preprocessor">#endif</span> |
| <a name="l00246"></a>00246 <span class="preprocessor"></span><span class="preprocessor">#ifndef SkFractMul</span> |
| <a name="l00247"></a><a class="code" href="_sk_fixed_8h.html#a18b96040f446115a5802aad12545bc16">00247</a> <span class="preprocessor"></span><span class="preprocessor"> #define SkFractMul(x, y) SkFractMul_portable(x, y)</span> |
| <a name="l00248"></a>00248 <span class="preprocessor"></span><span class="preprocessor">#endif</span> |
| <a name="l00249"></a>00249 <span class="preprocessor"></span><span class="preprocessor">#ifndef SkFixedMulAdd</span> |
| <a name="l00250"></a><a class="code" href="_sk_fixed_8h.html#a47f8a40808bdd0956888bba4b591f687">00250</a> <span class="preprocessor"></span><span class="preprocessor"> #define SkFixedMulAdd(x, y, a) (SkFixedMul(x, y) + (a))</span> |
| <a name="l00251"></a>00251 <span class="preprocessor"></span><span class="preprocessor">#endif</span> |
| <a name="l00252"></a>00252 <span class="preprocessor"></span> |
| <a name="l00253"></a>00253 <span class="preprocessor">#endif</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 |
| <a href="http://www.doxygen.org/index.html"> |
| <img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.6.1 </small></address> |
| </body> |
| </html> |
