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 114
 115 <div class="header">
 116   <div class="summary">
 117 <a href="#func-members">Functions</a>  </div>
 118   <div class="headertitle">
 119 <div class="title">warp_helpers.h File Reference</div>  </div>
 120 </div><!--header-->
 121 <div class="contents">
 122 <div class="textblock"><code>#include &quot;<a class="el" href="helpers_8h_source.xhtml">helpers.h</a>&quot;</code><br />
 123 </div>
 124 <p><a href="warp__helpers_8h_source.xhtml">Go to the source code of this file.</a></p>
 125 <table class="memberdecls">
 126 <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
 127 Functions</h2></td></tr>
 128 <tr class="memitem:adbdf2ca9e8fe0b67f9359929ef743126"><td class="memItemLeft" align="right" valign="top">const float8&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="warp__helpers_8h.xhtml#adbdf2ca9e8fe0b67f9359929ef743126">clamp_to_border</a> (float8 coords, const float width, const float height)</td></tr>
 129 <tr class="memdesc:adbdf2ca9e8fe0b67f9359929ef743126"><td class="mdescLeft">&#160;</td><td class="mdescRight">Clamps the given coordinates to the borders.  <a href="#adbdf2ca9e8fe0b67f9359929ef743126">More...</a><br /></td></tr>
 130 <tr class="separator:adbdf2ca9e8fe0b67f9359929ef743126"><td class="memSeparator" colspan="2">&#160;</td></tr>
 131 <tr class="memitem:aba42442a4c991cdbb52727fa370676f1"><td class="memItemLeft" align="right" valign="top">const DATA_TYPE4&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="warp__helpers_8h.xhtml#aba42442a4c991cdbb52727fa370676f1">read_texels4</a> (const <a class="el" href="struct_image.xhtml">Image</a> *in, const int8 coords)</td></tr>
 132 <tr class="memdesc:aba42442a4c991cdbb52727fa370676f1"><td class="mdescLeft">&#160;</td><td class="mdescRight">Reads four texels from the input image.  <a href="#aba42442a4c991cdbb52727fa370676f1">More...</a><br /></td></tr>
 133 <tr class="separator:aba42442a4c991cdbb52727fa370676f1"><td class="memSeparator" colspan="2">&#160;</td></tr>
 134 <tr class="memitem:a4caaeeb51ea58015267a9974675226d1"><td class="memItemLeft" align="right" valign="top">const float2&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="warp__helpers_8h.xhtml#a4caaeeb51ea58015267a9974675226d1">get_current_coords</a> ()</td></tr>
 135 <tr class="memdesc:a4caaeeb51ea58015267a9974675226d1"><td class="mdescLeft">&#160;</td><td class="mdescRight">Returns the current thread coordinates.  <a href="#a4caaeeb51ea58015267a9974675226d1">More...</a><br /></td></tr>
 136 <tr class="separator:a4caaeeb51ea58015267a9974675226d1"><td class="memSeparator" colspan="2">&#160;</td></tr>
 137 <tr class="memitem:a2d8047717d6464cad02c5979d09576db"><td class="memItemLeft" align="right" valign="top">const float8&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="warp__helpers_8h.xhtml#a2d8047717d6464cad02c5979d09576db">get_neighbour_coords</a> (const float2 coord)</td></tr>
 138 <tr class="memdesc:a2d8047717d6464cad02c5979d09576db"><td class="mdescLeft">&#160;</td><td class="mdescRight">Given a texel coordinates this function will return the following array of coordinates: [ P, right neighbour, below neighbour, below right neighbour ].  <a href="#a2d8047717d6464cad02c5979d09576db">More...</a><br /></td></tr>
 139 <tr class="separator:a2d8047717d6464cad02c5979d09576db"><td class="memSeparator" colspan="2">&#160;</td></tr>
 140 <tr class="memitem:abea9f226daf3e0ad741d03cf7417d353"><td class="memItemLeft" align="right" valign="top">const DATA_TYPE4&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="warp__helpers_8h.xhtml#abea9f226daf3e0ad741d03cf7417d353">bilinear_interpolate</a> (const <a class="el" href="struct_image.xhtml">Image</a> *in, const float8 coords, const float width, const float height)</td></tr>
 141 <tr class="memdesc:abea9f226daf3e0ad741d03cf7417d353"><td class="mdescLeft">&#160;</td><td class="mdescRight">Computes the bilinear interpolation for each set of coordinates in the vector coords and returns the values.  <a href="#abea9f226daf3e0ad741d03cf7417d353">More...</a><br /></td></tr>
 142 <tr class="separator:abea9f226daf3e0ad741d03cf7417d353"><td class="memSeparator" colspan="2">&#160;</td></tr>
 143 </table>
 144 <h2 class="groupheader">Function Documentation</h2>
 145 <a class="anchor" id="abea9f226daf3e0ad741d03cf7417d353"></a>
 146 <div class="memitem">
 147 <div class="memproto">
 148 <table class="mlabels">
 149   <tr>
 150   <td class="mlabels-left">
 151       <table class="memname">
 152         <tr>
 153           <td class="memname">const DATA_TYPE4 bilinear_interpolate </td>
 154           <td>(</td>
 155           <td class="paramtype">const <a class="el" href="struct_image.xhtml">Image</a> *&#160;</td>
 156           <td class="paramname"><em>in</em>, </td>
 157         </tr>
 158         <tr>
 159           <td class="paramkey"></td>
 160           <td></td>
 161           <td class="paramtype">const float8&#160;</td>
 162           <td class="paramname"><em>coords</em>, </td>
 163         </tr>
 164         <tr>
 165           <td class="paramkey"></td>
 166           <td></td>
 167           <td class="paramtype">const float&#160;</td>
 168           <td class="paramname"><em>width</em>, </td>
 169         </tr>
 170         <tr>
 171           <td class="paramkey"></td>
 172           <td></td>
 173           <td class="paramtype">const float&#160;</td>
 174           <td class="paramname"><em>height</em>&#160;</td>
 175         </tr>
 176         <tr>
 177           <td></td>
 178           <td>)</td>
 179           <td></td><td></td>
 180         </tr>
 181       </table>
 182   </td>
 183   <td class="mlabels-right">
 184 <span class="mlabels"><span class="mlabel">inline</span></span>  </td>
 185   </tr>
 186 </table>
 187 </div><div class="memdoc">
 188
 189 <p>Computes the bilinear interpolation for each set of coordinates in the vector coords and returns the values. </p>
 190 <dl class="params"><dt>Parameters</dt><dd>
 191   <table class="params">
 192     <tr><td class="paramdir">[in]</td><td class="paramname">in</td><td>Pointer to the source image. </td></tr>
 193     <tr><td class="paramdir">[in]</td><td class="paramname">coords</td><td><a class="el" href="struct_vector.xhtml" title="Structure to hold Vector information. ">Vector</a> of four 2D coordinates. Even pos is x and odd y. </td></tr>
 194     <tr><td class="paramdir">[in]</td><td class="paramname">width</td><td>Width of the image </td></tr>
 195     <tr><td class="paramdir">[in]</td><td class="paramname">height</td><td>Height of the image </td></tr>
 196   </table>
 197   </dd>
 198 </dl>
 199
 200 <p>Definition at line <a class="el" href="warp__helpers_8h_source.xhtml#l00080">80</a> of file <a class="el" href="warp__helpers_8h_source.xhtml">warp_helpers.h</a>.</p>
 201
 202 <p>References <a class="el" href="warp__helpers_8h_source.xhtml#l00033">clamp_to_border()</a>, <a class="el" href="helpers_8h_source.xhtml#l00035">CONVERT</a>, <a class="el" href="convolution3x3_8cl_source.xhtml#l00027">DATA_TYPE</a>, <a class="el" href="warp__helpers_8h_source.xhtml#l00068">get_neighbour_coords()</a>, <a class="el" href="helpers_8h_source.xhtml#l00201">offset()</a>, and <a class="el" href="helpers_8h_source.xhtml#l00032">VEC_DATA_TYPE</a>.</p>
 203
 204 <p>Referenced by <a class="el" href="remap_8cl_source.xhtml#l00113">remap_bilinear()</a>, <a class="el" href="scale_8cl_source.xhtml#l00110">scale_bilinear()</a>, <a class="el" href="warp__affine_8cl_source.xhtml#l00111">warp_affine_bilinear()</a>, and <a class="el" href="warp__perspective_8cl_source.xhtml#l00119">warp_perspective_bilinear()</a>.</p>
 205 <div class="fragment"><div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;{</div><div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;    <span class="comment">// If any of the 4 texels is out of the image&#39;s boundaries we use the border value (REPLICATE or CONSTANT) for any texel out of the image.</span></div><div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;</div><div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;    <span class="comment">// Sets the 4x4 coordinates for each of the four input texels</span></div><div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;    <span class="keyword">const</span> float8  fc = floor(coords);</div><div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;    <span class="keyword">const</span> float16 c1 = (float16)(</div><div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;                           <a class="code" href="warp__helpers_8h.xhtml#adbdf2ca9e8fe0b67f9359929ef743126">clamp_to_border</a>(<a class="code" href="warp__helpers_8h.xhtml#a2d8047717d6464cad02c5979d09576db">get_neighbour_coords</a>((float2)(fc.s0, fc.s1)), width, height),</div><div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;                           <a class="code" href="warp__helpers_8h.xhtml#adbdf2ca9e8fe0b67f9359929ef743126">clamp_to_border</a>(<a class="code" href="warp__helpers_8h.xhtml#a2d8047717d6464cad02c5979d09576db">get_neighbour_coords</a>((float2)(fc.s2, fc.s3)), width, height));</div><div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;    <span class="keyword">const</span> float16 c2 = (float16)(</div><div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;                           <a class="code" href="warp__helpers_8h.xhtml#adbdf2ca9e8fe0b67f9359929ef743126">clamp_to_border</a>(<a class="code" href="warp__helpers_8h.xhtml#a2d8047717d6464cad02c5979d09576db">get_neighbour_coords</a>((float2)(fc.s4, fc.s5)), width, height),</div><div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;                           <a class="code" href="warp__helpers_8h.xhtml#adbdf2ca9e8fe0b67f9359929ef743126">clamp_to_border</a>(<a class="code" href="warp__helpers_8h.xhtml#a2d8047717d6464cad02c5979d09576db">get_neighbour_coords</a>((float2)(fc.s6, fc.s7)), width, height));</div><div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;    <span class="comment">// Loads the values from the input image</span></div><div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;    <span class="keyword">const</span> float16 t = (float16)(</div><div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;                          <span class="comment">/* tl, tr, bl, br */</span></div><div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;                          * ((__global <a class="code" href="convolution3x3_8cl.xhtml#afb8c72ce35c4a1f4a2588d6573e54aa1">DATA_TYPE</a> *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(in, c1.s0, c1.s1)), *((__global <a class="code" href="convolution3x3_8cl.xhtml#afb8c72ce35c4a1f4a2588d6573e54aa1">DATA_TYPE</a> *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(in, c1.s2, c1.s3)),</div><div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;                          *((__global <a class="code" href="convolution3x3_8cl.xhtml#afb8c72ce35c4a1f4a2588d6573e54aa1">DATA_TYPE</a> *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(in, c1.s4, c1.s5)), *((__global <a class="code" href="convolution3x3_8cl.xhtml#afb8c72ce35c4a1f4a2588d6573e54aa1">DATA_TYPE</a> *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(in, c1.s6, c1.s7)),</div><div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;                          *((__global <a class="code" href="convolution3x3_8cl.xhtml#afb8c72ce35c4a1f4a2588d6573e54aa1">DATA_TYPE</a> *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(in, c1.s8, c1.s9)), *((__global <a class="code" href="convolution3x3_8cl.xhtml#afb8c72ce35c4a1f4a2588d6573e54aa1">DATA_TYPE</a> *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(in, c1.sa, c1.sb)),</div><div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;                          *((__global <a class="code" href="convolution3x3_8cl.xhtml#afb8c72ce35c4a1f4a2588d6573e54aa1">DATA_TYPE</a> *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(in, c1.sc, c1.sd)), *((__global <a class="code" href="convolution3x3_8cl.xhtml#afb8c72ce35c4a1f4a2588d6573e54aa1">DATA_TYPE</a> *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(in, c1.se, c1.sf)),</div><div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;                          *((__global <a class="code" href="convolution3x3_8cl.xhtml#afb8c72ce35c4a1f4a2588d6573e54aa1">DATA_TYPE</a> *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(in, c2.s0, c2.s1)), *((__global <a class="code" href="convolution3x3_8cl.xhtml#afb8c72ce35c4a1f4a2588d6573e54aa1">DATA_TYPE</a> *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(in, c2.s2, c2.s3)),</div><div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;                          *((__global <a class="code" href="convolution3x3_8cl.xhtml#afb8c72ce35c4a1f4a2588d6573e54aa1">DATA_TYPE</a> *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(in, c2.s4, c2.s5)), *((__global <a class="code" href="convolution3x3_8cl.xhtml#afb8c72ce35c4a1f4a2588d6573e54aa1">DATA_TYPE</a> *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(in, c2.s6, c2.s7)),</div><div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;                          *((__global <a class="code" href="convolution3x3_8cl.xhtml#afb8c72ce35c4a1f4a2588d6573e54aa1">DATA_TYPE</a> *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(in, c2.s8, c2.s9)), *((__global <a class="code" href="convolution3x3_8cl.xhtml#afb8c72ce35c4a1f4a2588d6573e54aa1">DATA_TYPE</a> *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(in, c2.sa, c2.sb)),</div><div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;                          *((__global <a class="code" href="convolution3x3_8cl.xhtml#afb8c72ce35c4a1f4a2588d6573e54aa1">DATA_TYPE</a> *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(in, c2.sc, c2.sd)), *((__global <a class="code" href="convolution3x3_8cl.xhtml#afb8c72ce35c4a1f4a2588d6573e54aa1">DATA_TYPE</a> *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(in, c2.se, c2.sf)));</div><div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;    <span class="keyword">const</span> float8 a  = coords - fc;</div><div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;    <span class="keyword">const</span> float8 b  = ((float8)(1.f)) - a;</div><div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;    <span class="keyword">const</span> float4 fr = (float4)(</div><div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;                          ((t.s0 * b.s0 * b.s1) + (t.s1 * a.s0 * b.s1) + (t.s2 * b.s0 * a.s1) + (t.s3 * a.s0 * a.s1)),</div><div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;                          ((t.s4 * b.s2 * b.s3) + (t.s5 * a.s2 * b.s3) + (t.s6 * b.s2 * a.s3) + (t.s7 * a.s2 * a.s3)),</div><div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;                          ((t.s8 * b.s4 * b.s5) + (t.s9 * a.s4 * b.s5) + (t.sa * b.s4 * a.s5) + (t.sb * a.s4 * a.s5)),</div><div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;                          ((t.sc * b.s6 * b.s7) + (t.sd * a.s6 * b.s7) + (t.se * b.s6 * a.s7) + (t.sf * a.s6 * a.s7)));</div><div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;    <span class="keywordflow">return</span> <a class="code" href="helpers_8h.xhtml#aa8d95ba04fc73845abc6045952cae5be">CONVERT</a>(fr, <a class="code" href="helpers_8h.xhtml#a36f754c05b6fddf6df0d8d0a74f8159f">VEC_DATA_TYPE</a>(<a class="code" href="convolution3x3_8cl.xhtml#afb8c72ce35c4a1f4a2588d6573e54aa1">DATA_TYPE</a>, 4));</div><div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;}</div><div class="ttc" id="warp__helpers_8h_xhtml_adbdf2ca9e8fe0b67f9359929ef743126"><div class="ttname"><a href="warp__helpers_8h.xhtml#adbdf2ca9e8fe0b67f9359929ef743126">clamp_to_border</a></div><div class="ttdeci">const float8 clamp_to_border(float8 coords, const float width, const float height)</div><div class="ttdoc">Clamps the given coordinates to the borders. </div><div class="ttdef"><b>Definition:</b> <a href="warp__helpers_8h_source.xhtml#l00033">warp_helpers.h:33</a></div></div>
 206 <div class="ttc" id="convolution3x3_8cl_xhtml_afb8c72ce35c4a1f4a2588d6573e54aa1"><div class="ttname"><a href="convolution3x3_8cl.xhtml#afb8c72ce35c4a1f4a2588d6573e54aa1">DATA_TYPE</a></div><div class="ttdeci">#define DATA_TYPE</div><div class="ttdef"><b>Definition:</b> <a href="convolution3x3_8cl_source.xhtml#l00027">convolution3x3.cl:27</a></div></div>
 207 <div class="ttc" id="helpers_8h_xhtml_a009469e4d9b8fce3b6d5e97d2077827d"><div class="ttname"><a href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a></div><div class="ttdeci">__global uchar * offset(const Image *img, int x, int y)</div><div class="ttdoc">Get the pointer position of a Image. </div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00201">helpers.h:201</a></div></div>
 208 <div class="ttc" id="helpers_8h_xhtml_a36f754c05b6fddf6df0d8d0a74f8159f"><div class="ttname"><a href="helpers_8h.xhtml#a36f754c05b6fddf6df0d8d0a74f8159f">VEC_DATA_TYPE</a></div><div class="ttdeci">#define VEC_DATA_TYPE(type, size)</div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00032">helpers.h:32</a></div></div>
 209 <div class="ttc" id="warp__helpers_8h_xhtml_a2d8047717d6464cad02c5979d09576db"><div class="ttname"><a href="warp__helpers_8h.xhtml#a2d8047717d6464cad02c5979d09576db">get_neighbour_coords</a></div><div class="ttdeci">const float8 get_neighbour_coords(const float2 coord)</div><div class="ttdoc">Given a texel coordinates this function will return the following array of coordinates: [ P...</div><div class="ttdef"><b>Definition:</b> <a href="warp__helpers_8h_source.xhtml#l00068">warp_helpers.h:68</a></div></div>
 210 <div class="ttc" id="helpers_8h_xhtml_aa8d95ba04fc73845abc6045952cae5be"><div class="ttname"><a href="helpers_8h.xhtml#aa8d95ba04fc73845abc6045952cae5be">CONVERT</a></div><div class="ttdeci">#define CONVERT(x, type)</div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00035">helpers.h:35</a></div></div>
 211 </div><!-- fragment -->
 212 </div>
 213 </div>
 214 <a class="anchor" id="adbdf2ca9e8fe0b67f9359929ef743126"></a>
 215 <div class="memitem">
 216 <div class="memproto">
 217 <table class="mlabels">
 218   <tr>
 219   <td class="mlabels-left">
 220       <table class="memname">
 221         <tr>
 222           <td class="memname">const float8 clamp_to_border </td>
 223           <td>(</td>
 224           <td class="paramtype">float8&#160;</td>
 225           <td class="paramname"><em>coords</em>, </td>
 226         </tr>
 227         <tr>
 228           <td class="paramkey"></td>
 229           <td></td>
 230           <td class="paramtype">const float&#160;</td>
 231           <td class="paramname"><em>width</em>, </td>
 232         </tr>
 233         <tr>
 234           <td class="paramkey"></td>
 235           <td></td>
 236           <td class="paramtype">const float&#160;</td>
 237           <td class="paramname"><em>height</em>&#160;</td>
 238         </tr>
 239         <tr>
 240           <td></td>
 241           <td>)</td>
 242           <td></td><td></td>
 243         </tr>
 244       </table>
 245   </td>
 246   <td class="mlabels-right">
 247 <span class="mlabels"><span class="mlabel">inline</span></span>  </td>
 248   </tr>
 249 </table>
 250 </div><div class="memdoc">
 251
 252 <p>Clamps the given coordinates to the borders. </p>
 253 <dl class="params"><dt>Parameters</dt><dd>
 254   <table class="params">
 255     <tr><td class="paramdir">[in]</td><td class="paramname">coords</td><td><a class="el" href="struct_vector.xhtml" title="Structure to hold Vector information. ">Vector</a> of 2D coordinates to clamp. Even positions are X coords, odd positions are Y coords. </td></tr>
 256     <tr><td class="paramdir">[in]</td><td class="paramname">width</td><td>Width of the image </td></tr>
 257     <tr><td class="paramdir">[in]</td><td class="paramname">height</td><td>Height of the image </td></tr>
 258   </table>
 259   </dd>
 260 </dl>
 261
 262 <p>Definition at line <a class="el" href="warp__helpers_8h_source.xhtml#l00033">33</a> of file <a class="el" href="warp__helpers_8h_source.xhtml">warp_helpers.h</a>.</p>
 263
 264 <p>References <a class="el" href="arm__compute_2core_2_helpers_8h_source.xhtml#l00193">arm_compute::clamp()</a>.</p>
 265
 266 <p>Referenced by <a class="el" href="warp__helpers_8h_source.xhtml#l00080">bilinear_interpolate()</a>, <a class="el" href="remap_8cl_source.xhtml#l00113">remap_bilinear()</a>, <a class="el" href="remap_8cl_source.xhtml#l00059">remap_nearest_neighbour()</a>, <a class="el" href="scale_8cl_source.xhtml#l00110">scale_bilinear()</a>, <a class="el" href="scale_8cl_source.xhtml#l00076">scale_nearest_neighbour()</a>, <a class="el" href="warp__affine_8cl_source.xhtml#l00111">warp_affine_bilinear()</a>, <a class="el" href="warp__affine_8cl_source.xhtml#l00079">warp_affine_nearest_neighbour()</a>, <a class="el" href="warp__perspective_8cl_source.xhtml#l00119">warp_perspective_bilinear()</a>, and <a class="el" href="warp__perspective_8cl_source.xhtml#l00087">warp_perspective_nearest_neighbour()</a>.</p>
 267 <div class="fragment"><div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;{</div><div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;    <span class="keyword">const</span> float4 clamped_x = <a class="code" href="namespacearm__compute.xhtml#a1c0b9414fe3a6ef6a7a23bd324ae9e67">clamp</a>(coords.even, -1.0f, width);</div><div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;    <span class="keyword">const</span> float4 clamped_y = <a class="code" href="namespacearm__compute.xhtml#a1c0b9414fe3a6ef6a7a23bd324ae9e67">clamp</a>(coords.odd, -1.0f, height);</div><div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;    <span class="keywordflow">return</span> (float8)(clamped_x.s0, clamped_y.s0, clamped_x.s1, clamped_y.s1, clamped_x.s2, clamped_y.s2, clamped_x.s3, clamped_y.s3);</div><div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;}</div><div class="ttc" id="namespacearm__compute_xhtml_a1c0b9414fe3a6ef6a7a23bd324ae9e67"><div class="ttname"><a href="namespacearm__compute.xhtml#a1c0b9414fe3a6ef6a7a23bd324ae9e67">arm_compute::clamp</a></div><div class="ttdeci">T clamp(const T &amp;n, const T &amp;lower, const T &amp;upper)</div><div class="ttdoc">Performs clamping among a lower and upper value. </div><div class="ttdef"><b>Definition:</b> <a href="arm__compute_2core_2_helpers_8h_source.xhtml#l00193">Helpers.h:193</a></div></div>
 268 </div><!-- fragment -->
 269 </div>
 270 </div>
 271 <a class="anchor" id="a4caaeeb51ea58015267a9974675226d1"></a>
 272 <div class="memitem">
 273 <div class="memproto">
 274 <table class="mlabels">
 275   <tr>
 276   <td class="mlabels-left">
 277       <table class="memname">
 278         <tr>
 279           <td class="memname">const float2 get_current_coords </td>
 280           <td>(</td>
 281           <td class="paramname"></td><td>)</td>
 282           <td></td>
 283         </tr>
 284       </table>
 285   </td>
 286   <td class="mlabels-right">
 287 <span class="mlabels"><span class="mlabel">inline</span></span>  </td>
 288   </tr>
 289 </table>
 290 </div><div class="memdoc">
 291
 292 <p>Returns the current thread coordinates. </p>
 293
 294 <p>Definition at line <a class="el" href="warp__helpers_8h_source.xhtml#l00054">54</a> of file <a class="el" href="warp__helpers_8h_source.xhtml">warp_helpers.h</a>.</p>
 295
 296 <p>Referenced by <a class="el" href="scale_8cl_source.xhtml#l00110">scale_bilinear()</a>, <a class="el" href="scale_8cl_source.xhtml#l00076">scale_nearest_neighbour()</a>, <a class="el" href="warp__affine_8cl_source.xhtml#l00111">warp_affine_bilinear()</a>, <a class="el" href="warp__affine_8cl_source.xhtml#l00079">warp_affine_nearest_neighbour()</a>, <a class="el" href="warp__perspective_8cl_source.xhtml#l00119">warp_perspective_bilinear()</a>, and <a class="el" href="warp__perspective_8cl_source.xhtml#l00087">warp_perspective_nearest_neighbour()</a>.</p>
 297 <div class="fragment"><div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;{</div><div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;    <span class="keywordflow">return</span> (float2)(get_global_id(0) * 4, get_global_id(1));</div><div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;}</div></div><!-- fragment -->
 298 </div>
 299 </div>
 300 <a class="anchor" id="a2d8047717d6464cad02c5979d09576db"></a>
 301 <div class="memitem">
 302 <div class="memproto">
 303 <table class="mlabels">
 304   <tr>
 305   <td class="mlabels-left">
 306       <table class="memname">
 307         <tr>
 308           <td class="memname">const float8 get_neighbour_coords </td>
 309           <td>(</td>
 310           <td class="paramtype">const float2&#160;</td>
 311           <td class="paramname"><em>coord</em></td><td>)</td>
 312           <td></td>
 313         </tr>
 314       </table>
 315   </td>
 316   <td class="mlabels-right">
 317 <span class="mlabels"><span class="mlabel">inline</span></span>  </td>
 318   </tr>
 319 </table>
 320 </div><div class="memdoc">
 321
 322 <p>Given a texel coordinates this function will return the following array of coordinates: [ P, right neighbour, below neighbour, below right neighbour ]. </p>
 323 <dl class="section note"><dt>Note</dt><dd>No checks to see if the coordinates are out of the image are done here.</dd></dl>
 324 <dl class="params"><dt>Parameters</dt><dd>
 325   <table class="params">
 326     <tr><td class="paramdir">[in]</td><td class="paramname">coord</td><td>Input coordinates</td></tr>
 327   </table>
 328   </dd>
 329 </dl>
 330 <dl class="section return"><dt>Returns</dt><dd>vector of 8 floats with the coordinates, even positions are x and odd y. </dd></dl>
 331
 332 <p>Definition at line <a class="el" href="warp__helpers_8h_source.xhtml#l00068">68</a> of file <a class="el" href="warp__helpers_8h_source.xhtml">warp_helpers.h</a>.</p>
 333
 334 <p>Referenced by <a class="el" href="warp__helpers_8h_source.xhtml#l00080">bilinear_interpolate()</a>.</p>
 335 <div class="fragment"><div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;{</div><div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;    <span class="keywordflow">return</span> (float8)(<span class="comment">/*tl*/</span> coord.s0, coord.s1, <span class="comment">/*tr*/</span> coord.s0 + 1, coord.s1, <span class="comment">/*bl*/</span> coord.s0, coord.s1 + 1, <span class="comment">/*br*/</span> coord.s0 + 1, coord.s1 + 1);</div><div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;}</div></div><!-- fragment -->
 336 </div>
 337 </div>
 338 <a class="anchor" id="aba42442a4c991cdbb52727fa370676f1"></a>
 339 <div class="memitem">
 340 <div class="memproto">
 341 <table class="mlabels">
 342   <tr>
 343   <td class="mlabels-left">
 344       <table class="memname">
 345         <tr>
 346           <td class="memname">const DATA_TYPE4 read_texels4 </td>
 347           <td>(</td>
 348           <td class="paramtype">const <a class="el" href="struct_image.xhtml">Image</a> *&#160;</td>
 349           <td class="paramname"><em>in</em>, </td>
 350         </tr>
 351         <tr>
 352           <td class="paramkey"></td>
 353           <td></td>
 354           <td class="paramtype">const int8&#160;</td>
 355           <td class="paramname"><em>coords</em>&#160;</td>
 356         </tr>
 357         <tr>
 358           <td></td>
 359           <td>)</td>
 360           <td></td><td></td>
 361         </tr>
 362       </table>
 363   </td>
 364   <td class="mlabels-right">
 365 <span class="mlabels"><span class="mlabel">inline</span></span>  </td>
 366   </tr>
 367 </table>
 368 </div><div class="memdoc">
 369
 370 <p>Reads four texels from the input image. </p>
 371 <p>The coords vector is used to determine which texels to be read.</p>
 372 <dl class="params"><dt>Parameters</dt><dd>
 373   <table class="params">
 374     <tr><td class="paramdir">[in]</td><td class="paramname">in</td><td>Pointer to the source image. </td></tr>
 375     <tr><td class="paramdir">[in]</td><td class="paramname">coords</td><td><a class="el" href="struct_vector.xhtml" title="Structure to hold Vector information. ">Vector</a> of coordinates to be read from the image. </td></tr>
 376   </table>
 377   </dd>
 378 </dl>
 379
 380 <p>Definition at line <a class="el" href="warp__helpers_8h_source.xhtml#l00045">45</a> of file <a class="el" href="warp__helpers_8h_source.xhtml">warp_helpers.h</a>.</p>
 381
 382 <p>References <a class="el" href="convolution3x3_8cl_source.xhtml#l00027">DATA_TYPE</a>, <a class="el" href="helpers_8h_source.xhtml#l00201">offset()</a>, and <a class="el" href="helpers_8h_source.xhtml#l00032">VEC_DATA_TYPE</a>.</p>
 383
 384 <p>Referenced by <a class="el" href="remap_8cl_source.xhtml#l00059">remap_nearest_neighbour()</a>, <a class="el" href="scale_8cl_source.xhtml#l00076">scale_nearest_neighbour()</a>, <a class="el" href="warp__affine_8cl_source.xhtml#l00079">warp_affine_nearest_neighbour()</a>, and <a class="el" href="warp__perspective_8cl_source.xhtml#l00087">warp_perspective_nearest_neighbour()</a>.</p>
 385 <div class="fragment"><div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;{</div><div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;    <span class="keywordflow">return</span> (<a class="code" href="helpers_8h.xhtml#a36f754c05b6fddf6df0d8d0a74f8159f">VEC_DATA_TYPE</a>(<a class="code" href="convolution3x3_8cl.xhtml#afb8c72ce35c4a1f4a2588d6573e54aa1">DATA_TYPE</a>, 4))(*((__global <a class="code" href="convolution3x3_8cl.xhtml#afb8c72ce35c4a1f4a2588d6573e54aa1">DATA_TYPE</a> *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(in, coords.s0, coords.s1)),</div><div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;                                         *((__global <a class="code" href="convolution3x3_8cl.xhtml#afb8c72ce35c4a1f4a2588d6573e54aa1">DATA_TYPE</a> *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(in, coords.s2, coords.s3)),</div><div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;                                         *((__global <a class="code" href="convolution3x3_8cl.xhtml#afb8c72ce35c4a1f4a2588d6573e54aa1">DATA_TYPE</a> *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(in, coords.s4, coords.s5)),</div><div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;                                         *((__global <a class="code" href="convolution3x3_8cl.xhtml#afb8c72ce35c4a1f4a2588d6573e54aa1">DATA_TYPE</a> *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(in, coords.s6, coords.s7)));</div><div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;}</div><div class="ttc" id="convolution3x3_8cl_xhtml_afb8c72ce35c4a1f4a2588d6573e54aa1"><div class="ttname"><a href="convolution3x3_8cl.xhtml#afb8c72ce35c4a1f4a2588d6573e54aa1">DATA_TYPE</a></div><div class="ttdeci">#define DATA_TYPE</div><div class="ttdef"><b>Definition:</b> <a href="convolution3x3_8cl_source.xhtml#l00027">convolution3x3.cl:27</a></div></div>
 386 <div class="ttc" id="helpers_8h_xhtml_a009469e4d9b8fce3b6d5e97d2077827d"><div class="ttname"><a href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a></div><div class="ttdeci">__global uchar * offset(const Image *img, int x, int y)</div><div class="ttdoc">Get the pointer position of a Image. </div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00201">helpers.h:201</a></div></div>
 387 <div class="ttc" id="helpers_8h_xhtml_a36f754c05b6fddf6df0d8d0a74f8159f"><div class="ttname"><a href="helpers_8h.xhtml#a36f754c05b6fddf6df0d8d0a74f8159f">VEC_DATA_TYPE</a></div><div class="ttdeci">#define VEC_DATA_TYPE(type, size)</div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00032">helpers.h:32</a></div></div>
 388 </div><!-- fragment -->
 389 </div>
 390 </div>
 391 </div><!-- contents -->
 392 </div><!-- doc-content -->
 393 <!-- start footer part -->
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 395   <ul>
 396     <li class="navelem"><a class="el" href="dir_68267d1309a1af8e8297ef4c3efbcdba.xhtml">src</a></li><li class="navelem"><a class="el" href="dir_aebb8dcc11953d78e620bbef0b9e2183.xhtml">core</a></li><li class="navelem"><a class="el" href="dir_8c278f79c760e5c5fbd911f9870614c1.xhtml">CL</a></li><li class="navelem"><a class="el" href="dir_25885286e9dad4fa105b7b25a8031bbf.xhtml">cl_kernels</a></li><li class="navelem"><a class="el" href="warp__helpers_8h.xhtml">warp_helpers.h</a></li>
 397     <li class="footer">Generated on Fri Jun 23 2017 15:44:34 for Compute Library by
 398     <a href="http://www.doxygen.org/index.html">
 399     <img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.8.11 </li>
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