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gerrit-public.fairphone.software / platform / external / ComputeLibrary / dbdab85d6e0f96d3361a9e30310367d89953466c / . / documentation / warp__affine_8cl.xhtml
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Anthony Barbierdbdab852017-06-23 15:42:00 +0100[diff] [blame^]9<title>Compute Library: src/core/CL/cl_kernels/warp_affine.cl File Reference</title>
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Anthony Barbierdbdab852017-06-23 15:42:00 +0100[diff] [blame^]42 <div id="projectname">Compute Library
43 &#160;<span id="projectnumber">v17.06</span>
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117<a href="#func-members">Functions</a> </div>
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119<div class="title">warp_affine.cl 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<code>#include &quot;<a class="el" href="warp__helpers_8h_source.xhtml">warp_helpers.h</a>&quot;</code><br />
124</div>
125<p><a href="warp__affine_8cl_source.xhtml">Go to the source code of this file.</a></p>
126<table class="memberdecls">
127<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
128Functions</h2></td></tr>
129<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>
130<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>
131<tr class="separator:aecca3f284d1acabfa6d1bd8905dc036e"><td class="memSeparator" colspan="2">&#160;</td></tr>
132<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>
133<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>
134<tr class="separator:a78e971ccef9598f9545f344d3a90a312"><td class="memSeparator" colspan="2">&#160;</td></tr>
135<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>
136<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>
137<tr class="separator:a716ebd98bb81a3addb7f4d769e118dd9"><td class="memSeparator" colspan="2">&#160;</td></tr>
138<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>
139<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>
140<tr class="separator:a4a77d9bbbc01353083729a076cedc38c"><td class="memSeparator" colspan="2">&#160;</td></tr>
141</table>
142<h2 class="groupheader">Function Documentation</h2>
143<a class="anchor" id="a78e971ccef9598f9545f344d3a90a312"></a>
144<div class="memitem">
145<div class="memproto">
146<table class="mlabels">
147 <tr>
148 <td class="mlabels-left">
149 <table class="memname">
150 <tr>
151 <td class="memname">const float8 apply_affine_transform </td>
152 <td>(</td>
153 <td class="paramtype">const float2&#160;</td>
154 <td class="paramname"><em>coord</em>, </td>
155 </tr>
156 <tr>
157 <td class="paramkey"></td>
158 <td></td>
159 <td class="paramtype">const float8&#160;</td>
160 <td class="paramname"><em>mtx</em>&#160;</td>
161 </tr>
162 <tr>
163 <td></td>
164 <td>)</td>
165 <td></td><td></td>
166 </tr>
167 </table>
168 </td>
169 <td class="mlabels-right">
170<span class="mlabels"><span class="mlabel">inline</span></span> </td>
171 </tr>
172</table>
173</div><div class="memdoc">
174
175<p>Transforms 4 2D coordinates using the formula: </p>
176<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>
177<dl class="params"><dt>Parameters</dt><dd>
178 <table class="params">
179 <tr><td class="paramdir">[in]</td><td class="paramname">coord</td><td>2D coordinate to transform. </td></tr>
180 <tr><td class="paramdir">[in]</td><td class="paramname">mtx</td><td>affine matrix</td></tr>
181 </table>
182 </dd>
183</dl>
184<dl class="section return"><dt>Returns</dt><dd>a int8 containing 4 2D transformed values. </dd></dl>
185
186<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>
187
188<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>
189<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 -->
190</div>
191</div>
192<a class="anchor" id="aecca3f284d1acabfa6d1bd8905dc036e"></a>
193<div class="memitem">
194<div class="memproto">
195<table class="mlabels">
196 <tr>
197 <td class="mlabels-left">
198 <table class="memname">
199 <tr>
200 <td class="memname">const float8 build_affine_mtx </td>
201 <td>(</td>
202 <td class="paramname"></td><td>)</td>
203 <td></td>
204 </tr>
205 </table>
206 </td>
207 <td class="mlabels-right">
208<span class="mlabels"><span class="mlabel">inline</span></span> </td>
209 </tr>
210</table>
211</div><div class="memdoc">
212
213<p>Returns a vector of floats contaning the matrix coefficients. </p>
214
215<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>
216
217<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>
218<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 -->
219</div>
220</div>
221<a class="anchor" id="a4a77d9bbbc01353083729a076cedc38c"></a>
222<div class="memitem">
223<div class="memproto">
224 <table class="memname">
225 <tr>
226 <td class="memname">__kernel void warp_affine_bilinear </td>
227 <td>(</td>
228 <td class="paramtype">__global uchar *&#160;</td>
229 <td class="paramname"><em>in_ptr</em>, </td>
230 </tr>
231 <tr>
232 <td class="paramkey"></td>
233 <td></td>
234 <td class="paramtype">uint&#160;</td>
235 <td class="paramname"><em>in_stride_x</em>, </td>
236 </tr>
237 <tr>
238 <td class="paramkey"></td>
239 <td></td>
240 <td class="paramtype">uint&#160;</td>
241 <td class="paramname"><em>in_step_x</em>, </td>
242 </tr>
243 <tr>
244 <td class="paramkey"></td>
245 <td></td>
246 <td class="paramtype">uint&#160;</td>
247 <td class="paramname"><em>in_stride_y</em>, </td>
248 </tr>
249 <tr>
250 <td class="paramkey"></td>
251 <td></td>
252 <td class="paramtype">uint&#160;</td>
253 <td class="paramname"><em>in_step_y</em>, </td>
254 </tr>
255 <tr>
256 <td class="paramkey"></td>
257 <td></td>
258 <td class="paramtype">uint&#160;</td>
259 <td class="paramname"><em>in_offset_first_element_in_bytes</em>, </td>
260 </tr>
261 <tr>
262 <td class="paramkey"></td>
263 <td></td>
264 <td class="paramtype">__global uchar *&#160;</td>
265 <td class="paramname"><em>out_ptr</em>, </td>
266 </tr>
267 <tr>
268 <td class="paramkey"></td>
269 <td></td>
270 <td class="paramtype">uint&#160;</td>
271 <td class="paramname"><em>out_stride_x</em>, </td>
272 </tr>
273 <tr>
274 <td class="paramkey"></td>
275 <td></td>
276 <td class="paramtype">uint&#160;</td>
277 <td class="paramname"><em>out_step_x</em>, </td>
278 </tr>
279 <tr>
280 <td class="paramkey"></td>
281 <td></td>
282 <td class="paramtype">uint&#160;</td>
283 <td class="paramname"><em>out_stride_y</em>, </td>
284 </tr>
285 <tr>
286 <td class="paramkey"></td>
287 <td></td>
288 <td class="paramtype">uint&#160;</td>
289 <td class="paramname"><em>out_step_y</em>, </td>
290 </tr>
291 <tr>
292 <td class="paramkey"></td>
293 <td></td>
294 <td class="paramtype">uint&#160;</td>
295 <td class="paramname"><em>out_offset_first_element_in_bytes</em>, </td>
296 </tr>
297 <tr>
298 <td class="paramkey"></td>
299 <td></td>
300 <td class="paramtype">const int&#160;</td>
301 <td class="paramname"><em>width</em>, </td>
302 </tr>
303 <tr>
304 <td class="paramkey"></td>
305 <td></td>
306 <td class="paramtype">const int&#160;</td>
307 <td class="paramname"><em>height</em>&#160;</td>
308 </tr>
309 <tr>
310 <td></td>
311 <td>)</td>
312 <td></td><td></td>
313 </tr>
314 </table>
315</div><div class="memdoc">
316
317<p>Performs an affine transform on an image interpolating with the BILINEAR method. </p>
318<p>Input and output are single channel U8.</p>
319<dl class="section attention"><dt>Attention</dt><dd>The matrix coefficients need to be passed at compile time:<br />
320const char build_options [] = "-DMAT0=1 -DMAT1=2 -DMAT2=1 -DMAT3=2 -DMAT4=4 -DMAT5=2 "<br />
321clBuildProgram( program, 0, NULL, build_options, NULL, NULL);</dd></dl>
322<dl class="params"><dt>Parameters</dt><dd>
323 <table class="params">
324 <tr><td class="paramdir">[in]</td><td class="paramname">in_ptr</td><td>Pointer to the source image. Supported data types: U8. </td></tr>
325 <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>
326 <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>
327 <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>
328 <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>
329 <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>
330 <tr><td class="paramdir">[out]</td><td class="paramname">out_ptr</td><td>Pointer to the destination image. Supported data types: U8. </td></tr>
331 <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>
332 <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>
333 <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>
334 <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>
335 <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>
336 <tr><td class="paramdir">[in]</td><td class="paramname">width</td><td>Width of the destination image </td></tr>
337 <tr><td class="paramdir">[in]</td><td class="paramname">height</td><td>Height of the destination image </td></tr>
338 </table>
339 </dd>
340</dl>
341
342<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>
343
344<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>
345<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>
346<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>
347<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>
348<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>
349<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>
350<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>
351<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>
352<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>
353<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>
354</div><!-- fragment -->
355</div>
356</div>
357<a class="anchor" id="a716ebd98bb81a3addb7f4d769e118dd9"></a>
358<div class="memitem">
359<div class="memproto">
360 <table class="memname">
361 <tr>
362 <td class="memname">__kernel void warp_affine_nearest_neighbour </td>
363 <td>(</td>
364 <td class="paramtype">__global uchar *&#160;</td>
365 <td class="paramname"><em>in_ptr</em>, </td>
366 </tr>
367 <tr>
368 <td class="paramkey"></td>
369 <td></td>
370 <td class="paramtype">uint&#160;</td>
371 <td class="paramname"><em>in_stride_x</em>, </td>
372 </tr>
373 <tr>
374 <td class="paramkey"></td>
375 <td></td>
376 <td class="paramtype">uint&#160;</td>
377 <td class="paramname"><em>in_step_x</em>, </td>
378 </tr>
379 <tr>
380 <td class="paramkey"></td>
381 <td></td>
382 <td class="paramtype">uint&#160;</td>
383 <td class="paramname"><em>in_stride_y</em>, </td>
384 </tr>
385 <tr>
386 <td class="paramkey"></td>
387 <td></td>
388 <td class="paramtype">uint&#160;</td>
389 <td class="paramname"><em>in_step_y</em>, </td>
390 </tr>
391 <tr>
392 <td class="paramkey"></td>
393 <td></td>
394 <td class="paramtype">uint&#160;</td>
395 <td class="paramname"><em>in_offset_first_element_in_bytes</em>, </td>
396 </tr>
397 <tr>
398 <td class="paramkey"></td>
399 <td></td>
400 <td class="paramtype">__global uchar *&#160;</td>
401 <td class="paramname"><em>out_ptr</em>, </td>
402 </tr>
403 <tr>
404 <td class="paramkey"></td>
405 <td></td>
406 <td class="paramtype">uint&#160;</td>
407 <td class="paramname"><em>out_stride_x</em>, </td>
408 </tr>
409 <tr>
410 <td class="paramkey"></td>
411 <td></td>
412 <td class="paramtype">uint&#160;</td>
413 <td class="paramname"><em>out_step_x</em>, </td>
414 </tr>
415 <tr>
416 <td class="paramkey"></td>
417 <td></td>
418 <td class="paramtype">uint&#160;</td>
419 <td class="paramname"><em>out_stride_y</em>, </td>
420 </tr>
421 <tr>
422 <td class="paramkey"></td>
423 <td></td>
424 <td class="paramtype">uint&#160;</td>
425 <td class="paramname"><em>out_step_y</em>, </td>
426 </tr>
427 <tr>
428 <td class="paramkey"></td>
429 <td></td>
430 <td class="paramtype">uint&#160;</td>
431 <td class="paramname"><em>out_offset_first_element_in_bytes</em>, </td>
432 </tr>
433 <tr>
434 <td class="paramkey"></td>
435 <td></td>
436 <td class="paramtype">const int&#160;</td>
437 <td class="paramname"><em>width</em>, </td>
438 </tr>
439 <tr>
440 <td class="paramkey"></td>
441 <td></td>
442 <td class="paramtype">const int&#160;</td>
443 <td class="paramname"><em>height</em>&#160;</td>
444 </tr>
445 <tr>
446 <td></td>
447 <td>)</td>
448 <td></td><td></td>
449 </tr>
450 </table>
451</div><div class="memdoc">
452
453<p>Performs an affine transform on an image interpolating with the NEAREAST NEIGHBOUR method. </p>
454<p>Input and output are single channel U8.</p>
455<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>
456<dl class="section attention"><dt>Attention</dt><dd>The matrix coefficients need to be passed at compile time:<br />
457const char build_options [] = "-DMAT0=1 -DMAT1=2 -DMAT2=1 -DMAT3=2 -DMAT4=4 -DMAT5=2 "<br />
458clBuildProgram( program, 0, NULL, build_options, NULL, NULL);</dd></dl>
459<dl class="params"><dt>Parameters</dt><dd>
460 <table class="params">
461 <tr><td class="paramdir">[in]</td><td class="paramname">in_ptr</td><td>Pointer to the source image. Supported data types: U8. </td></tr>
462 <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>
463 <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>
464 <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>
465 <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>
466 <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>
467 <tr><td class="paramdir">[out]</td><td class="paramname">out_ptr</td><td>Pointer to the destination image. Supported data types: U8. </td></tr>
468 <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>
469 <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>
470 <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>
471 <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>
472 <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>
473 <tr><td class="paramdir">[in]</td><td class="paramname">width</td><td>Width of the destination image </td></tr>
474 <tr><td class="paramdir">[in]</td><td class="paramname">height</td><td>Height of the destination image </td></tr>
475 </table>
476 </dd>
477</dl>
478
479<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>
480
481<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>
482<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>
483<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>
484<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>
485<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>
486<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>
487<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>
488<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>
489<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>
490<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>
491</div><!-- fragment -->
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498 <ul>
499 <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__affine_8cl.xhtml">warp_affine.cl</a></li>
Anthony Barbierdbdab852017-06-23 15:42:00 +0100[diff] [blame^]500 <li class="footer">Generated on Fri Jun 23 2017 15:44:34 for Compute Library by
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502 <img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.8.11 </li>
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