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 114 <div class="header">
 115   <div class="summary">
 116 <a href="#func-members">Functions</a>  </div>
 117   <div class="headertitle">
 118 <div class="title">warp_affine.cl File Reference</div>  </div>
 119 </div><!--header-->
 120 <div class="contents">
 121 <div class="textblock"><code>#include &quot;<a class="el" href="helpers_8h_source.xhtml">helpers.h</a>&quot;</code><br />
 122 <code>#include &quot;<a class="el" href="warp__helpers_8h_source.xhtml">warp_helpers.h</a>&quot;</code><br />
 123 </div>
 124 <p><a href="warp__affine_8cl_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:aecca3f284d1acabfa6d1bd8905dc036e"><td class="memItemLeft" align="right" valign="top">const float8&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="warp__affine_8cl.xhtml#aecca3f284d1acabfa6d1bd8905dc036e">build_affine_mtx</a> ()</td></tr>
 129 <tr class="memdesc:aecca3f284d1acabfa6d1bd8905dc036e"><td class="mdescLeft">&#160;</td><td class="mdescRight">Returns a vector of floats contaning the matrix coefficients.  <a href="#aecca3f284d1acabfa6d1bd8905dc036e">More...</a><br /></td></tr>
 130 <tr class="separator:aecca3f284d1acabfa6d1bd8905dc036e"><td class="memSeparator" colspan="2">&#160;</td></tr>
 131 <tr class="memitem:a78e971ccef9598f9545f344d3a90a312"><td class="memItemLeft" align="right" valign="top">const float8&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="warp__affine_8cl.xhtml#a78e971ccef9598f9545f344d3a90a312">apply_affine_transform</a> (const float2 coord, const float8 mtx)</td></tr>
 132 <tr class="memdesc:a78e971ccef9598f9545f344d3a90a312"><td class="mdescLeft">&#160;</td><td class="mdescRight">Transforms 4 2D coordinates using the formula:  <a href="#a78e971ccef9598f9545f344d3a90a312">More...</a><br /></td></tr>
 133 <tr class="separator:a78e971ccef9598f9545f344d3a90a312"><td class="memSeparator" colspan="2">&#160;</td></tr>
 134 <tr class="memitem:a716ebd98bb81a3addb7f4d769e118dd9"><td class="memItemLeft" align="right" valign="top">__kernel void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="warp__affine_8cl.xhtml#a716ebd98bb81a3addb7f4d769e118dd9">warp_affine_nearest_neighbour</a> (__global uchar *in_ptr, uint in_stride_x, uint in_step_x, uint in_stride_y, uint in_step_y, uint in_offset_first_element_in_bytes, __global uchar *out_ptr, uint out_stride_x, uint out_step_x, uint out_stride_y, uint out_step_y, uint out_offset_first_element_in_bytes, const int width, const int height)</td></tr>
 135 <tr class="memdesc:a716ebd98bb81a3addb7f4d769e118dd9"><td class="mdescLeft">&#160;</td><td class="mdescRight">Performs an affine transform on an image interpolating with the NEAREAST NEIGHBOUR method.  <a href="#a716ebd98bb81a3addb7f4d769e118dd9">More...</a><br /></td></tr>
 136 <tr class="separator:a716ebd98bb81a3addb7f4d769e118dd9"><td class="memSeparator" colspan="2">&#160;</td></tr>
 137 <tr class="memitem:a4a77d9bbbc01353083729a076cedc38c"><td class="memItemLeft" align="right" valign="top">__kernel void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="warp__affine_8cl.xhtml#a4a77d9bbbc01353083729a076cedc38c">warp_affine_bilinear</a> (__global uchar *in_ptr, uint in_stride_x, uint in_step_x, uint in_stride_y, uint in_step_y, uint in_offset_first_element_in_bytes, __global uchar *out_ptr, uint out_stride_x, uint out_step_x, uint out_stride_y, uint out_step_y, uint out_offset_first_element_in_bytes, const int width, const int height)</td></tr>
 138 <tr class="memdesc:a4a77d9bbbc01353083729a076cedc38c"><td class="mdescLeft">&#160;</td><td class="mdescRight">Performs an affine transform on an image interpolating with the BILINEAR method.  <a href="#a4a77d9bbbc01353083729a076cedc38c">More...</a><br /></td></tr>
 139 <tr class="separator:a4a77d9bbbc01353083729a076cedc38c"><td class="memSeparator" colspan="2">&#160;</td></tr>
 140 </table>
 141 <h2 class="groupheader">Function Documentation</h2>
 142 <a class="anchor" id="a78e971ccef9598f9545f344d3a90a312"></a>
 143 <div class="memitem">
 144 <div class="memproto">
 145 <table class="mlabels">
 146   <tr>
 147   <td class="mlabels-left">
 148       <table class="memname">
 149         <tr>
 150           <td class="memname">const float8 apply_affine_transform </td>
 151           <td>(</td>
 152           <td class="paramtype">const float2&#160;</td>
 153           <td class="paramname"><em>coord</em>, </td>
 154         </tr>
 155         <tr>
 156           <td class="paramkey"></td>
 157           <td></td>
 158           <td class="paramtype">const float8&#160;</td>
 159           <td class="paramname"><em>mtx</em>&#160;</td>
 160         </tr>
 161         <tr>
 162           <td></td>
 163           <td>)</td>
 164           <td></td><td></td>
 165         </tr>
 166       </table>
 167   </td>
 168   <td class="mlabels-right">
 169 <span class="mlabels"><span class="mlabel">inline</span></span>  </td>
 170   </tr>
 171 </table>
 172 </div><div class="memdoc">
 173
 174 <p>Transforms 4 2D coordinates using the formula: </p>
 175 <p>x0 = M[1][1] * x + M[1][2] * y + M[1][3] y0 = M[2][1] * x + M[2][2] * y + M[2][3]</p>
 176 <dl class="params"><dt>Parameters</dt><dd>
 177   <table class="params">
 178     <tr><td class="paramdir">[in]</td><td class="paramname">coord</td><td>2D coordinate to transform. </td></tr>
 179     <tr><td class="paramdir">[in]</td><td class="paramname">mtx</td><td>affine matrix</td></tr>
 180   </table>
 181   </dd>
 182 </dl>
 183 <dl class="section return"><dt>Returns</dt><dd>a int8 containing 4 2D transformed values. </dd></dl>
 184
 185 <p>Definition at line <a class="el" href="warp__affine_8cl_source.xhtml#l00043">43</a> of file <a class="el" href="warp__affine_8cl_source.xhtml">warp_affine.cl</a>.</p>
 186
 187 <p>Referenced by <a class="el" href="warp__affine_8cl_source.xhtml#l00111">warp_affine_bilinear()</a>, and <a class="el" href="warp__affine_8cl_source.xhtml#l00079">warp_affine_nearest_neighbour()</a>.</p>
 188 <div class="fragment"><div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;{</div><div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;    <span class="keyword">const</span> float4 in_x_coords = (float4)(coord.s0, 1 + coord.s0, 2 + coord.s0, 3 + coord.s0);</div><div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;    <span class="comment">// transform [x,x+1,x+2,x+3]</span></div><div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;    <span class="keyword">const</span> float4 new_x = mad(<span class="comment">/*A*/</span> in_x_coords, (float4)(mtx.s0) <span class="comment">/*B*/</span>, mad((float4)(coord.s1), (float4)(mtx.s2), (float4)(mtx.s4)));</div><div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;    <span class="comment">// transform [y,y+1,y+2,y+3]</span></div><div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;    <span class="keyword">const</span> float4 new_y = mad(in_x_coords, (float4)(mtx.s1), mad((float4)(coord.s1), (float4)(mtx.s3), (float4)(mtx.s5)));</div><div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;    <span class="keywordflow">return</span> (float8)(new_x.s0, new_y.s0, new_x.s1, new_y.s1, new_x.s2, new_y.s2, new_x.s3, new_y.s3);</div><div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;}</div></div><!-- fragment -->
 189 </div>
 190 </div>
 191 <a class="anchor" id="aecca3f284d1acabfa6d1bd8905dc036e"></a>
 192 <div class="memitem">
 193 <div class="memproto">
 194 <table class="mlabels">
 195   <tr>
 196   <td class="mlabels-left">
 197       <table class="memname">
 198         <tr>
 199           <td class="memname">const float8 build_affine_mtx </td>
 200           <td>(</td>
 201           <td class="paramname"></td><td>)</td>
 202           <td></td>
 203         </tr>
 204       </table>
 205   </td>
 206   <td class="mlabels-right">
 207 <span class="mlabels"><span class="mlabel">inline</span></span>  </td>
 208   </tr>
 209 </table>
 210 </div><div class="memdoc">
 211
 212 <p>Returns a vector of floats contaning the matrix coefficients. </p>
 213
 214 <p>Definition at line <a class="el" href="warp__affine_8cl_source.xhtml#l00028">28</a> of file <a class="el" href="warp__affine_8cl_source.xhtml">warp_affine.cl</a>.</p>
 215
 216 <p>Referenced by <a class="el" href="warp__affine_8cl_source.xhtml#l00111">warp_affine_bilinear()</a>, and <a class="el" href="warp__affine_8cl_source.xhtml#l00079">warp_affine_nearest_neighbour()</a>.</p>
 217 <div class="fragment"><div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;{</div><div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;    <span class="keywordflow">return</span> (float8)(MAT0, MAT1, MAT2, MAT3, MAT4, MAT5, 0, 0);</div><div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;}</div></div><!-- fragment -->
 218 </div>
 219 </div>
 220 <a class="anchor" id="a4a77d9bbbc01353083729a076cedc38c"></a>
 221 <div class="memitem">
 222 <div class="memproto">
 223       <table class="memname">
 224         <tr>
 225           <td class="memname">__kernel void warp_affine_bilinear </td>
 226           <td>(</td>
 227           <td class="paramtype">__global uchar *&#160;</td>
 228           <td class="paramname"><em>in_ptr</em>, </td>
 229         </tr>
 230         <tr>
 231           <td class="paramkey"></td>
 232           <td></td>
 233           <td class="paramtype">uint&#160;</td>
 234           <td class="paramname"><em>in_stride_x</em>, </td>
 235         </tr>
 236         <tr>
 237           <td class="paramkey"></td>
 238           <td></td>
 239           <td class="paramtype">uint&#160;</td>
 240           <td class="paramname"><em>in_step_x</em>, </td>
 241         </tr>
 242         <tr>
 243           <td class="paramkey"></td>
 244           <td></td>
 245           <td class="paramtype">uint&#160;</td>
 246           <td class="paramname"><em>in_stride_y</em>, </td>
 247         </tr>
 248         <tr>
 249           <td class="paramkey"></td>
 250           <td></td>
 251           <td class="paramtype">uint&#160;</td>
 252           <td class="paramname"><em>in_step_y</em>, </td>
 253         </tr>
 254         <tr>
 255           <td class="paramkey"></td>
 256           <td></td>
 257           <td class="paramtype">uint&#160;</td>
 258           <td class="paramname"><em>in_offset_first_element_in_bytes</em>, </td>
 259         </tr>
 260         <tr>
 261           <td class="paramkey"></td>
 262           <td></td>
 263           <td class="paramtype">__global uchar *&#160;</td>
 264           <td class="paramname"><em>out_ptr</em>, </td>
 265         </tr>
 266         <tr>
 267           <td class="paramkey"></td>
 268           <td></td>
 269           <td class="paramtype">uint&#160;</td>
 270           <td class="paramname"><em>out_stride_x</em>, </td>
 271         </tr>
 272         <tr>
 273           <td class="paramkey"></td>
 274           <td></td>
 275           <td class="paramtype">uint&#160;</td>
 276           <td class="paramname"><em>out_step_x</em>, </td>
 277         </tr>
 278         <tr>
 279           <td class="paramkey"></td>
 280           <td></td>
 281           <td class="paramtype">uint&#160;</td>
 282           <td class="paramname"><em>out_stride_y</em>, </td>
 283         </tr>
 284         <tr>
 285           <td class="paramkey"></td>
 286           <td></td>
 287           <td class="paramtype">uint&#160;</td>
 288           <td class="paramname"><em>out_step_y</em>, </td>
 289         </tr>
 290         <tr>
 291           <td class="paramkey"></td>
 292           <td></td>
 293           <td class="paramtype">uint&#160;</td>
 294           <td class="paramname"><em>out_offset_first_element_in_bytes</em>, </td>
 295         </tr>
 296         <tr>
 297           <td class="paramkey"></td>
 298           <td></td>
 299           <td class="paramtype">const int&#160;</td>
 300           <td class="paramname"><em>width</em>, </td>
 301         </tr>
 302         <tr>
 303           <td class="paramkey"></td>
 304           <td></td>
 305           <td class="paramtype">const int&#160;</td>
 306           <td class="paramname"><em>height</em>&#160;</td>
 307         </tr>
 308         <tr>
 309           <td></td>
 310           <td>)</td>
 311           <td></td><td></td>
 312         </tr>
 313       </table>
 314 </div><div class="memdoc">
 315
 316 <p>Performs an affine transform on an image interpolating with the BILINEAR method. </p>
 317 <p>Input and output are single channel U8.</p>
 318 <dl class="section attention"><dt>Attention</dt><dd>The matrix coefficients need to be passed at compile time:<br />
 319 const char build_options [] = "-DMAT0=1 -DMAT1=2 -DMAT2=1 -DMAT3=2 -DMAT4=4 -DMAT5=2 "<br />
 320 clBuildProgram( program, 0, NULL, build_options, NULL, NULL);</dd></dl>
 321 <dl class="params"><dt>Parameters</dt><dd>
 322   <table class="params">
 323     <tr><td class="paramdir">[in]</td><td class="paramname">in_ptr</td><td>Pointer to the source image. Supported data types: U8. </td></tr>
 324     <tr><td class="paramdir">[in]</td><td class="paramname">in_stride_x</td><td>Stride of the source image in X dimension (in bytes) </td></tr>
 325     <tr><td class="paramdir">[in]</td><td class="paramname">in_step_x</td><td>in_stride_x * number of elements along X processed per work item (in bytes) </td></tr>
 326     <tr><td class="paramdir">[in]</td><td class="paramname">in_stride_y</td><td>Stride of the source image in Y dimension (in bytes) </td></tr>
 327     <tr><td class="paramdir">[in]</td><td class="paramname">in_step_y</td><td>in_stride_y * number of elements along Y processed per work item (in bytes) </td></tr>
 328     <tr><td class="paramdir">[in]</td><td class="paramname">in_offset_first_element_in_bytes</td><td>Offset of the first element in the source image </td></tr>
 329     <tr><td class="paramdir">[out]</td><td class="paramname">out_ptr</td><td>Pointer to the destination image. Supported data types: U8. </td></tr>
 330     <tr><td class="paramdir">[in]</td><td class="paramname">out_stride_x</td><td>Stride of the destination image in X dimension (in bytes) </td></tr>
 331     <tr><td class="paramdir">[in]</td><td class="paramname">out_step_x</td><td>out_stride_x * number of elements along X processed per work item (in bytes) </td></tr>
 332     <tr><td class="paramdir">[in]</td><td class="paramname">out_stride_y</td><td>Stride of the destination image in Y dimension (in bytes) </td></tr>
 333     <tr><td class="paramdir">[in]</td><td class="paramname">out_step_y</td><td>out_stride_y * number of elements along Y processed per work item (in bytes) </td></tr>
 334     <tr><td class="paramdir">[in]</td><td class="paramname">out_offset_first_element_in_bytes</td><td>Offset of the first element in the destination image </td></tr>
 335     <tr><td class="paramdir">[in]</td><td class="paramname">width</td><td>Width of the destination image </td></tr>
 336     <tr><td class="paramdir">[in]</td><td class="paramname">height</td><td>Height of the destination image </td></tr>
 337   </table>
 338   </dd>
 339 </dl>
 340
 341 <p>Definition at line <a class="el" href="warp__affine_8cl_source.xhtml#l00111">111</a> of file <a class="el" href="warp__affine_8cl_source.xhtml">warp_affine.cl</a>.</p>
 342
 343 <p>References <a class="el" href="warp__affine_8cl_source.xhtml#l00043">apply_affine_transform()</a>, <a class="el" href="warp__helpers_8h_source.xhtml#l00080">bilinear_interpolate()</a>, <a class="el" href="warp__affine_8cl_source.xhtml#l00028">build_affine_mtx()</a>, <a class="el" href="warp__helpers_8h_source.xhtml#l00033">clamp_to_border()</a>, <a class="el" href="helpers_8h_source.xhtml#l00073">CONVERT_TO_IMAGE_STRUCT</a>, <a class="el" href="helpers_8h_source.xhtml#l00076">CONVERT_TO_IMAGE_STRUCT_NO_STEP</a>, <a class="el" href="warp__helpers_8h_source.xhtml#l00054">get_current_coords()</a>, and <a class="el" href="helpers_8h_source.xhtml#l00097">Image::ptr</a>.</p>
 344 <div class="fragment"><div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;{</div><div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;    <a class="code" href="struct_image.xhtml">Image</a> in  = <a class="code" href="helpers_8h.xhtml#a4334a4a76f8e9628c0fb9e1acf616e2a">CONVERT_TO_IMAGE_STRUCT_NO_STEP</a>(in);</div><div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;    <a class="code" href="struct_image.xhtml">Image</a> out = <a class="code" href="helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a>(out);</div><div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;    vstore4(<a class="code" href="warp__helpers_8h.xhtml#abea9f226daf3e0ad741d03cf7417d353">bilinear_interpolate</a>(&amp;in, <a class="code" href="warp__helpers_8h.xhtml#adbdf2ca9e8fe0b67f9359929ef743126">clamp_to_border</a>(<a class="code" href="warp__affine_8cl.xhtml#a78e971ccef9598f9545f344d3a90a312">apply_affine_transform</a>(<a class="code" href="warp__helpers_8h.xhtml#a4caaeeb51ea58015267a9974675226d1">get_current_coords</a>(), <a class="code" href="warp__affine_8cl.xhtml#aecca3f284d1acabfa6d1bd8905dc036e">build_affine_mtx</a>()), width, height), width, height), 0, out.<a class="code" href="struct_image.xhtml#acf52c23cbd7424606c10a606524e3e32">ptr</a>);</div><div class="line"><a name="l00120"></a><span class="lineno">  120</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>
 345 <div class="ttc" id="helpers_8h_xhtml_a4334a4a76f8e9628c0fb9e1acf616e2a"><div class="ttname"><a href="helpers_8h.xhtml#a4334a4a76f8e9628c0fb9e1acf616e2a">CONVERT_TO_IMAGE_STRUCT_NO_STEP</a></div><div class="ttdeci">#define CONVERT_TO_IMAGE_STRUCT_NO_STEP(name)</div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00076">helpers.h:76</a></div></div>
 346 <div class="ttc" id="warp__affine_8cl_xhtml_aecca3f284d1acabfa6d1bd8905dc036e"><div class="ttname"><a href="warp__affine_8cl.xhtml#aecca3f284d1acabfa6d1bd8905dc036e">build_affine_mtx</a></div><div class="ttdeci">const float8 build_affine_mtx()</div><div class="ttdoc">Returns a vector of floats contaning the matrix coefficients. </div><div class="ttdef"><b>Definition:</b> <a href="warp__affine_8cl_source.xhtml#l00028">warp_affine.cl:28</a></div></div>
 347 <div class="ttc" id="helpers_8h_xhtml_aebe814363556c244be043b13e7969197"><div class="ttname"><a href="helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a></div><div class="ttdeci">#define CONVERT_TO_IMAGE_STRUCT(name)</div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00073">helpers.h:73</a></div></div>
 348 <div class="ttc" id="struct_image_xhtml"><div class="ttname"><a href="struct_image.xhtml">Image</a></div><div class="ttdoc">Structure to hold Image information. </div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00095">helpers.h:95</a></div></div>
 349 <div class="ttc" id="struct_image_xhtml_acf52c23cbd7424606c10a606524e3e32"><div class="ttname"><a href="struct_image.xhtml#acf52c23cbd7424606c10a606524e3e32">Image::ptr</a></div><div class="ttdeci">__global uchar * ptr</div><div class="ttdoc">Pointer to the starting postion of the buffer. </div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00097">helpers.h:97</a></div></div>
 350 <div class="ttc" id="warp__helpers_8h_xhtml_a4caaeeb51ea58015267a9974675226d1"><div class="ttname"><a href="warp__helpers_8h.xhtml#a4caaeeb51ea58015267a9974675226d1">get_current_coords</a></div><div class="ttdeci">const float2 get_current_coords()</div><div class="ttdoc">Returns the current thread coordinates. </div><div class="ttdef"><b>Definition:</b> <a href="warp__helpers_8h_source.xhtml#l00054">warp_helpers.h:54</a></div></div>
 351 <div class="ttc" id="warp__affine_8cl_xhtml_a78e971ccef9598f9545f344d3a90a312"><div class="ttname"><a href="warp__affine_8cl.xhtml#a78e971ccef9598f9545f344d3a90a312">apply_affine_transform</a></div><div class="ttdeci">const float8 apply_affine_transform(const float2 coord, const float8 mtx)</div><div class="ttdoc">Transforms 4 2D coordinates using the formula: </div><div class="ttdef"><b>Definition:</b> <a href="warp__affine_8cl_source.xhtml#l00043">warp_affine.cl:43</a></div></div>
 352 <div class="ttc" id="warp__helpers_8h_xhtml_abea9f226daf3e0ad741d03cf7417d353"><div class="ttname"><a href="warp__helpers_8h.xhtml#abea9f226daf3e0ad741d03cf7417d353">bilinear_interpolate</a></div><div class="ttdeci">const DATA_TYPE4 bilinear_interpolate(const Image *in, const float8 coords, const float width, const float height)</div><div class="ttdoc">Computes the bilinear interpolation for each set of coordinates in the vector coords and returns the ...</div><div class="ttdef"><b>Definition:</b> <a href="warp__helpers_8h_source.xhtml#l00080">warp_helpers.h:80</a></div></div>
 353 </div><!-- fragment -->
 354 </div>
 355 </div>
 356 <a class="anchor" id="a716ebd98bb81a3addb7f4d769e118dd9"></a>
 357 <div class="memitem">
 358 <div class="memproto">
 359       <table class="memname">
 360         <tr>
 361           <td class="memname">__kernel void warp_affine_nearest_neighbour </td>
 362           <td>(</td>
 363           <td class="paramtype">__global uchar *&#160;</td>
 364           <td class="paramname"><em>in_ptr</em>, </td>
 365         </tr>
 366         <tr>
 367           <td class="paramkey"></td>
 368           <td></td>
 369           <td class="paramtype">uint&#160;</td>
 370           <td class="paramname"><em>in_stride_x</em>, </td>
 371         </tr>
 372         <tr>
 373           <td class="paramkey"></td>
 374           <td></td>
 375           <td class="paramtype">uint&#160;</td>
 376           <td class="paramname"><em>in_step_x</em>, </td>
 377         </tr>
 378         <tr>
 379           <td class="paramkey"></td>
 380           <td></td>
 381           <td class="paramtype">uint&#160;</td>
 382           <td class="paramname"><em>in_stride_y</em>, </td>
 383         </tr>
 384         <tr>
 385           <td class="paramkey"></td>
 386           <td></td>
 387           <td class="paramtype">uint&#160;</td>
 388           <td class="paramname"><em>in_step_y</em>, </td>
 389         </tr>
 390         <tr>
 391           <td class="paramkey"></td>
 392           <td></td>
 393           <td class="paramtype">uint&#160;</td>
 394           <td class="paramname"><em>in_offset_first_element_in_bytes</em>, </td>
 395         </tr>
 396         <tr>
 397           <td class="paramkey"></td>
 398           <td></td>
 399           <td class="paramtype">__global uchar *&#160;</td>
 400           <td class="paramname"><em>out_ptr</em>, </td>
 401         </tr>
 402         <tr>
 403           <td class="paramkey"></td>
 404           <td></td>
 405           <td class="paramtype">uint&#160;</td>
 406           <td class="paramname"><em>out_stride_x</em>, </td>
 407         </tr>
 408         <tr>
 409           <td class="paramkey"></td>
 410           <td></td>
 411           <td class="paramtype">uint&#160;</td>
 412           <td class="paramname"><em>out_step_x</em>, </td>
 413         </tr>
 414         <tr>
 415           <td class="paramkey"></td>
 416           <td></td>
 417           <td class="paramtype">uint&#160;</td>
 418           <td class="paramname"><em>out_stride_y</em>, </td>
 419         </tr>
 420         <tr>
 421           <td class="paramkey"></td>
 422           <td></td>
 423           <td class="paramtype">uint&#160;</td>
 424           <td class="paramname"><em>out_step_y</em>, </td>
 425         </tr>
 426         <tr>
 427           <td class="paramkey"></td>
 428           <td></td>
 429           <td class="paramtype">uint&#160;</td>
 430           <td class="paramname"><em>out_offset_first_element_in_bytes</em>, </td>
 431         </tr>
 432         <tr>
 433           <td class="paramkey"></td>
 434           <td></td>
 435           <td class="paramtype">const int&#160;</td>
 436           <td class="paramname"><em>width</em>, </td>
 437         </tr>
 438         <tr>
 439           <td class="paramkey"></td>
 440           <td></td>
 441           <td class="paramtype">const int&#160;</td>
 442           <td class="paramname"><em>height</em>&#160;</td>
 443         </tr>
 444         <tr>
 445           <td></td>
 446           <td>)</td>
 447           <td></td><td></td>
 448         </tr>
 449       </table>
 450 </div><div class="memdoc">
 451
 452 <p>Performs an affine transform on an image interpolating with the NEAREAST NEIGHBOUR method. </p>
 453 <p>Input and output are single channel U8.</p>
 454 <p>This kernel performs an affine transform with a 2x3 Matrix M with this method of pixel coordinate translation: x0 = M[1][1] * x + M[1][2] * y + M[1][3] y0 = M[2][1] * x + M[2][2] * y + M[2][3] output(x,y) = input(x0,y0)</p>
 455 <dl class="section attention"><dt>Attention</dt><dd>The matrix coefficients need to be passed at compile time:<br />
 456 const char build_options [] = "-DMAT0=1 -DMAT1=2 -DMAT2=1 -DMAT3=2 -DMAT4=4 -DMAT5=2 "<br />
 457 clBuildProgram( program, 0, NULL, build_options, NULL, NULL);</dd></dl>
 458 <dl class="params"><dt>Parameters</dt><dd>
 459   <table class="params">
 460     <tr><td class="paramdir">[in]</td><td class="paramname">in_ptr</td><td>Pointer to the source image. Supported data types: U8. </td></tr>
 461     <tr><td class="paramdir">[in]</td><td class="paramname">in_stride_x</td><td>Stride of the source image in X dimension (in bytes) </td></tr>
 462     <tr><td class="paramdir">[in]</td><td class="paramname">in_step_x</td><td>in_stride_x * number of elements along X processed per work item (in bytes) </td></tr>
 463     <tr><td class="paramdir">[in]</td><td class="paramname">in_stride_y</td><td>Stride of the source image in Y dimension (in bytes) </td></tr>
 464     <tr><td class="paramdir">[in]</td><td class="paramname">in_step_y</td><td>in_stride_y * number of elements along Y processed per work item (in bytes) </td></tr>
 465     <tr><td class="paramdir">[in]</td><td class="paramname">in_offset_first_element_in_bytes</td><td>Offset of the first element in the source image </td></tr>
 466     <tr><td class="paramdir">[out]</td><td class="paramname">out_ptr</td><td>Pointer to the destination image. Supported data types: U8. </td></tr>
 467     <tr><td class="paramdir">[in]</td><td class="paramname">out_stride_x</td><td>Stride of the destination image in X dimension (in bytes) </td></tr>
 468     <tr><td class="paramdir">[in]</td><td class="paramname">out_step_x</td><td>out_stride_x * number of elements along X processed per work item (in bytes) </td></tr>
 469     <tr><td class="paramdir">[in]</td><td class="paramname">out_stride_y</td><td>Stride of the destination image in Y dimension (in bytes) </td></tr>
 470     <tr><td class="paramdir">[in]</td><td class="paramname">out_step_y</td><td>out_stride_y * number of elements along Y processed per work item (in bytes) </td></tr>
 471     <tr><td class="paramdir">[in]</td><td class="paramname">out_offset_first_element_in_bytes</td><td>Offset of the first element in the destination image </td></tr>
 472     <tr><td class="paramdir">[in]</td><td class="paramname">width</td><td>Width of the destination image </td></tr>
 473     <tr><td class="paramdir">[in]</td><td class="paramname">height</td><td>Height of the destination image </td></tr>
 474   </table>
 475   </dd>
 476 </dl>
 477
 478 <p>Definition at line <a class="el" href="warp__affine_8cl_source.xhtml#l00079">79</a> of file <a class="el" href="warp__affine_8cl_source.xhtml">warp_affine.cl</a>.</p>
 479
 480 <p>References <a class="el" href="warp__affine_8cl_source.xhtml#l00043">apply_affine_transform()</a>, <a class="el" href="warp__affine_8cl_source.xhtml#l00028">build_affine_mtx()</a>, <a class="el" href="warp__helpers_8h_source.xhtml#l00033">clamp_to_border()</a>, <a class="el" href="helpers_8h_source.xhtml#l00073">CONVERT_TO_IMAGE_STRUCT</a>, <a class="el" href="helpers_8h_source.xhtml#l00076">CONVERT_TO_IMAGE_STRUCT_NO_STEP</a>, <a class="el" href="warp__helpers_8h_source.xhtml#l00054">get_current_coords()</a>, <a class="el" href="helpers_8h_source.xhtml#l00097">Image::ptr</a>, and <a class="el" href="warp__helpers_8h_source.xhtml#l00045">read_texels4()</a>.</p>
 481 <div class="fragment"><div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;{</div><div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;    <a class="code" href="struct_image.xhtml">Image</a> in  = <a class="code" href="helpers_8h.xhtml#a4334a4a76f8e9628c0fb9e1acf616e2a">CONVERT_TO_IMAGE_STRUCT_NO_STEP</a>(in);</div><div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;    <a class="code" href="struct_image.xhtml">Image</a> out = <a class="code" href="helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a>(out);</div><div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;    vstore4(<a class="code" href="warp__helpers_8h.xhtml#aba42442a4c991cdbb52727fa370676f1">read_texels4</a>(&amp;in, convert_int8(<a class="code" href="warp__helpers_8h.xhtml#adbdf2ca9e8fe0b67f9359929ef743126">clamp_to_border</a>(<a class="code" href="warp__affine_8cl.xhtml#a78e971ccef9598f9545f344d3a90a312">apply_affine_transform</a>(<a class="code" href="warp__helpers_8h.xhtml#a4caaeeb51ea58015267a9974675226d1">get_current_coords</a>(), <a class="code" href="warp__affine_8cl.xhtml#aecca3f284d1acabfa6d1bd8905dc036e">build_affine_mtx</a>()), width, height))), 0, out.<a class="code" href="struct_image.xhtml#acf52c23cbd7424606c10a606524e3e32">ptr</a>);</div><div class="line"><a name="l00088"></a><span class="lineno">   88</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>
 482 <div class="ttc" id="helpers_8h_xhtml_a4334a4a76f8e9628c0fb9e1acf616e2a"><div class="ttname"><a href="helpers_8h.xhtml#a4334a4a76f8e9628c0fb9e1acf616e2a">CONVERT_TO_IMAGE_STRUCT_NO_STEP</a></div><div class="ttdeci">#define CONVERT_TO_IMAGE_STRUCT_NO_STEP(name)</div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00076">helpers.h:76</a></div></div>
 483 <div class="ttc" id="warp__affine_8cl_xhtml_aecca3f284d1acabfa6d1bd8905dc036e"><div class="ttname"><a href="warp__affine_8cl.xhtml#aecca3f284d1acabfa6d1bd8905dc036e">build_affine_mtx</a></div><div class="ttdeci">const float8 build_affine_mtx()</div><div class="ttdoc">Returns a vector of floats contaning the matrix coefficients. </div><div class="ttdef"><b>Definition:</b> <a href="warp__affine_8cl_source.xhtml#l00028">warp_affine.cl:28</a></div></div>
 484 <div class="ttc" id="helpers_8h_xhtml_aebe814363556c244be043b13e7969197"><div class="ttname"><a href="helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a></div><div class="ttdeci">#define CONVERT_TO_IMAGE_STRUCT(name)</div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00073">helpers.h:73</a></div></div>
 485 <div class="ttc" id="struct_image_xhtml"><div class="ttname"><a href="struct_image.xhtml">Image</a></div><div class="ttdoc">Structure to hold Image information. </div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00095">helpers.h:95</a></div></div>
 486 <div class="ttc" id="struct_image_xhtml_acf52c23cbd7424606c10a606524e3e32"><div class="ttname"><a href="struct_image.xhtml#acf52c23cbd7424606c10a606524e3e32">Image::ptr</a></div><div class="ttdeci">__global uchar * ptr</div><div class="ttdoc">Pointer to the starting postion of the buffer. </div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00097">helpers.h:97</a></div></div>
 487 <div class="ttc" id="warp__helpers_8h_xhtml_aba42442a4c991cdbb52727fa370676f1"><div class="ttname"><a href="warp__helpers_8h.xhtml#aba42442a4c991cdbb52727fa370676f1">read_texels4</a></div><div class="ttdeci">const DATA_TYPE4 read_texels4(const Image *in, const int8 coords)</div><div class="ttdoc">Reads four texels from the input image. </div><div class="ttdef"><b>Definition:</b> <a href="warp__helpers_8h_source.xhtml#l00045">warp_helpers.h:45</a></div></div>
 488 <div class="ttc" id="warp__helpers_8h_xhtml_a4caaeeb51ea58015267a9974675226d1"><div class="ttname"><a href="warp__helpers_8h.xhtml#a4caaeeb51ea58015267a9974675226d1">get_current_coords</a></div><div class="ttdeci">const float2 get_current_coords()</div><div class="ttdoc">Returns the current thread coordinates. </div><div class="ttdef"><b>Definition:</b> <a href="warp__helpers_8h_source.xhtml#l00054">warp_helpers.h:54</a></div></div>
 489 <div class="ttc" id="warp__affine_8cl_xhtml_a78e971ccef9598f9545f344d3a90a312"><div class="ttname"><a href="warp__affine_8cl.xhtml#a78e971ccef9598f9545f344d3a90a312">apply_affine_transform</a></div><div class="ttdeci">const float8 apply_affine_transform(const float2 coord, const float8 mtx)</div><div class="ttdoc">Transforms 4 2D coordinates using the formula: </div><div class="ttdef"><b>Definition:</b> <a href="warp__affine_8cl_source.xhtml#l00043">warp_affine.cl:43</a></div></div>
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 499     <li class="footer">Generated on Wed May 3 2017 17:20:04 for ARM Compute Library by
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