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114<div class="header">
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116<a href="#define-members">Macros</a> &#124;
117<a href="#func-members">Functions</a> </div>
118 <div class="headertitle">
119<div class="title">histogram.cl File Reference</div> </div>
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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="histogram_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="define-members"></a>
127Macros</h2></td></tr>
128<tr class="memitem:a2c8a35cfde24ca7728709200962e1a91"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="histogram_8cl.xhtml#a2c8a35cfde24ca7728709200962e1a91">VATOMIC_INC16</a>(histogram, win_pos)</td></tr>
129<tr class="separator:a2c8a35cfde24ca7728709200962e1a91"><td class="memSeparator" colspan="2">&#160;</td></tr>
130</table><table class="memberdecls">
131<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
132Functions</h2></td></tr>
133<tr class="memitem:abc81d92c9655c4ec22fff9163b66279d"><td class="memItemLeft" align="right" valign="top">__kernel void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="histogram_8cl.xhtml#abc81d92c9655c4ec22fff9163b66279d">hist_local_kernel</a> (__global uchar *input_ptr, uint input_stride_x, uint input_step_x, uint input_stride_y, uint input_step_y, uint input_offset_first_element_in_bytes, __local uint *histogram_local, __global uint *restrict histogram, uint num_bins, uint <a class="el" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>, uint range, uint offrange)</td></tr>
134<tr class="memdesc:abc81d92c9655c4ec22fff9163b66279d"><td class="mdescLeft">&#160;</td><td class="mdescRight">Calculate the histogram of an 8 bit grayscale image. <a href="#abc81d92c9655c4ec22fff9163b66279d">More...</a><br /></td></tr>
135<tr class="separator:abc81d92c9655c4ec22fff9163b66279d"><td class="memSeparator" colspan="2">&#160;</td></tr>
136<tr class="memitem:af82fea967051b827585009463255262d"><td class="memItemLeft" align="right" valign="top">__kernel void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="histogram_8cl.xhtml#af82fea967051b827585009463255262d">hist_border_kernel</a> (__global uchar *input_ptr, uint input_stride_x, uint input_step_x, uint input_stride_y, uint input_step_y, uint input_offset_first_element_in_bytes, __global uint *restrict histogram, uint num_bins, uint <a class="el" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>, uint range, uint offrange)</td></tr>
137<tr class="memdesc:af82fea967051b827585009463255262d"><td class="mdescLeft">&#160;</td><td class="mdescRight">Calculate the histogram of an 8 bit grayscale image's border. <a href="#af82fea967051b827585009463255262d">More...</a><br /></td></tr>
138<tr class="separator:af82fea967051b827585009463255262d"><td class="memSeparator" colspan="2">&#160;</td></tr>
139<tr class="memitem:a7c8051ab952a597e66090d77f4dc60e4"><td class="memItemLeft" align="right" valign="top">__kernel void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="histogram_8cl.xhtml#a7c8051ab952a597e66090d77f4dc60e4">hist_local_kernel_fixed</a> (__global uchar *input_ptr, uint input_stride_x, uint input_step_x, uint input_stride_y, uint input_step_y, uint input_offset_first_element_in_bytes, __local uint *histogram_local, __global uint *restrict histogram)</td></tr>
140<tr class="memdesc:a7c8051ab952a597e66090d77f4dc60e4"><td class="mdescLeft">&#160;</td><td class="mdescRight">Calculate the histogram of an 8 bit grayscale image with bin size of 256 and window size of 1. <a href="#a7c8051ab952a597e66090d77f4dc60e4">More...</a><br /></td></tr>
141<tr class="separator:a7c8051ab952a597e66090d77f4dc60e4"><td class="memSeparator" colspan="2">&#160;</td></tr>
142<tr class="memitem:aec6ec6157573195df9694109ebbb38ae"><td class="memItemLeft" align="right" valign="top">__kernel void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="histogram_8cl.xhtml#aec6ec6157573195df9694109ebbb38ae">hist_border_kernel_fixed</a> (__global uchar *input_ptr, uint input_stride_x, uint input_step_x, uint input_stride_y, uint input_step_y, uint input_offset_first_element_in_bytes, __global uint *restrict histogram)</td></tr>
143<tr class="memdesc:aec6ec6157573195df9694109ebbb38ae"><td class="mdescLeft">&#160;</td><td class="mdescRight">Calculate the histogram of an 8 bit grayscale image with bin size as 256 and window size as 1. <a href="#aec6ec6157573195df9694109ebbb38ae">More...</a><br /></td></tr>
144<tr class="separator:aec6ec6157573195df9694109ebbb38ae"><td class="memSeparator" colspan="2">&#160;</td></tr>
145</table>
146<h2 class="groupheader">Macro Definition Documentation</h2>
147<a class="anchor" id="a2c8a35cfde24ca7728709200962e1a91"></a>
148<div class="memitem">
149<div class="memproto">
150 <table class="memname">
151 <tr>
152 <td class="memname">#define VATOMIC_INC16</td>
153 <td>(</td>
154 <td class="paramtype">&#160;</td>
155 <td class="paramname">histogram, </td>
156 </tr>
157 <tr>
158 <td class="paramkey"></td>
159 <td></td>
160 <td class="paramtype">&#160;</td>
161 <td class="paramname">win_pos&#160;</td>
162 </tr>
163 <tr>
164 <td></td>
165 <td>)</td>
166 <td></td><td></td>
167 </tr>
168 </table>
169</div><div class="memdoc">
170<b>Value:</b><div class="fragment"><div class="line">{ \</div><div class="line"> atomic_inc(histogram + win_pos.s0); \</div><div class="line"> atomic_inc(histogram + win_pos.s1); \</div><div class="line"> atomic_inc(histogram + win_pos.s2); \</div><div class="line"> atomic_inc(histogram + win_pos.s3); \</div><div class="line"> atomic_inc(histogram + win_pos.s4); \</div><div class="line"> atomic_inc(histogram + win_pos.s5); \</div><div class="line"> atomic_inc(histogram + win_pos.s6); \</div><div class="line"> atomic_inc(histogram + win_pos.s7); \</div><div class="line"> atomic_inc(histogram + win_pos.s8); \</div><div class="line"> atomic_inc(histogram + win_pos.s9); \</div><div class="line"> atomic_inc(histogram + win_pos.sa); \</div><div class="line"> atomic_inc(histogram + win_pos.sb); \</div><div class="line"> atomic_inc(histogram + win_pos.sc); \</div><div class="line"> atomic_inc(histogram + win_pos.sd); \</div><div class="line"> atomic_inc(histogram + win_pos.se); \</div><div class="line"> atomic_inc(histogram + win_pos.sf); \</div><div class="line"> }</div></div><!-- fragment -->
171<p>Definition at line <a class="el" href="histogram_8cl_source.xhtml#l00026">26</a> of file <a class="el" href="histogram_8cl_source.xhtml">histogram.cl</a>.</p>
172
173<p>Referenced by <a class="el" href="histogram_8cl_source.xhtml#l00068">hist_local_kernel()</a>.</p>
174
175</div>
176</div>
177<h2 class="groupheader">Function Documentation</h2>
178<a class="anchor" id="af82fea967051b827585009463255262d"></a>
179<div class="memitem">
180<div class="memproto">
181 <table class="memname">
182 <tr>
183 <td class="memname">__kernel void hist_border_kernel </td>
184 <td>(</td>
185 <td class="paramtype">__global uchar *&#160;</td>
186 <td class="paramname"><em>input_ptr</em>, </td>
187 </tr>
188 <tr>
189 <td class="paramkey"></td>
190 <td></td>
191 <td class="paramtype">uint&#160;</td>
192 <td class="paramname"><em>input_stride_x</em>, </td>
193 </tr>
194 <tr>
195 <td class="paramkey"></td>
196 <td></td>
197 <td class="paramtype">uint&#160;</td>
198 <td class="paramname"><em>input_step_x</em>, </td>
199 </tr>
200 <tr>
201 <td class="paramkey"></td>
202 <td></td>
203 <td class="paramtype">uint&#160;</td>
204 <td class="paramname"><em>input_stride_y</em>, </td>
205 </tr>
206 <tr>
207 <td class="paramkey"></td>
208 <td></td>
209 <td class="paramtype">uint&#160;</td>
210 <td class="paramname"><em>input_step_y</em>, </td>
211 </tr>
212 <tr>
213 <td class="paramkey"></td>
214 <td></td>
215 <td class="paramtype">uint&#160;</td>
216 <td class="paramname"><em>input_offset_first_element_in_bytes</em>, </td>
217 </tr>
218 <tr>
219 <td class="paramkey"></td>
220 <td></td>
221 <td class="paramtype">__global uint *restrict&#160;</td>
222 <td class="paramname"><em>histogram</em>, </td>
223 </tr>
224 <tr>
225 <td class="paramkey"></td>
226 <td></td>
227 <td class="paramtype">uint&#160;</td>
228 <td class="paramname"><em>num_bins</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>offset</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>range</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>offrange</em>&#160;</td>
247 </tr>
248 <tr>
249 <td></td>
250 <td>)</td>
251 <td></td><td></td>
252 </tr>
253 </table>
254</div><div class="memdoc">
255
256<p>Calculate the histogram of an 8 bit grayscale image's border. </p>
257<p>Each thread will process one pixel using global atomic. When all work items in a work group are done the resulting local histograms are added to the global histogram using global atomics.</p>
258<dl class="section note"><dt>Note</dt><dd>The input image is represented as a two-dimensional array of type uchar. The output is represented as a one-dimensional uint array of length of num_bins</dd></dl>
259<dl class="params"><dt>Parameters</dt><dd>
260 <table class="params">
261 <tr><td class="paramdir">[in]</td><td class="paramname">input_ptr</td><td>Pointer to the first source image. Supported data types: U8 </td></tr>
262 <tr><td class="paramdir">[in]</td><td class="paramname">input_stride_x</td><td>Stride of the first source image in X dimension (in bytes) </td></tr>
263 <tr><td class="paramdir">[in]</td><td class="paramname">input_step_x</td><td>input_stride_x * number of elements along X processed per workitem(in bytes) </td></tr>
264 <tr><td class="paramdir">[in]</td><td class="paramname">input_stride_y</td><td>Stride of the first source image in Y dimension (in bytes) </td></tr>
265 <tr><td class="paramdir">[in]</td><td class="paramname">input_step_y</td><td>input_stride_y * number of elements along Y processed per workitem(in bytes) </td></tr>
266 <tr><td class="paramdir">[in]</td><td class="paramname">input_offset_first_element_in_bytes</td><td>The offset of the first element in the first source image </td></tr>
267 <tr><td class="paramdir">[out]</td><td class="paramname">histogram</td><td>The output buffer to hold histogram final result. Supported data types: U32 </td></tr>
268 <tr><td class="paramdir">[out]</td><td class="paramname">num_bins</td><td>The number of bins </td></tr>
269 <tr><td class="paramdir">[out]</td><td class="paramname">offset</td><td>The start of values to use (inclusive) </td></tr>
270 <tr><td class="paramdir">[out]</td><td class="paramname">range</td><td>The range of a bin </td></tr>
271 <tr><td class="paramdir">[out]</td><td class="paramname">offrange</td><td>The maximum value (exclusive) </td></tr>
272 </table>
273 </dd>
274</dl>
275
276<p>Definition at line <a class="el" href="histogram_8cl_source.xhtml#l00141">141</a> of file <a class="el" href="histogram_8cl_source.xhtml">histogram.cl</a>.</p>
277
278<p>References <a class="el" href="helpers_8h_source.xhtml#l00073">CONVERT_TO_IMAGE_STRUCT</a>, <a class="el" href="helpers_8h_source.xhtml#l00201">offset()</a>, and <a class="el" href="helpers_8h_source.xhtml#l00097">Image::ptr</a>.</p>
279<div class="fragment"><div class="line"><a name="l00147"></a><span class="lineno"> 147</span>&#160;{</div><div class="line"><a name="l00148"></a><span class="lineno"> 148</span>&#160; <a class="code" href="struct_image.xhtml">Image</a> input_buffer = <a class="code" href="helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a>(input);</div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span>&#160;</div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span>&#160; uint val = (uint)(*input_buffer.<a class="code" href="struct_image.xhtml#acf52c23cbd7424606c10a606524e3e32">ptr</a>);</div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span>&#160;</div><div class="line"><a name="l00152"></a><span class="lineno"> 152</span>&#160; uint win_pos = (val &gt;= <a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>) ? (((val - <a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>) * num_bins) / range) : 0;</div><div class="line"><a name="l00153"></a><span class="lineno"> 153</span>&#160;</div><div class="line"><a name="l00154"></a><span class="lineno"> 154</span>&#160; <span class="keywordflow">if</span>(val &gt;= <a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a> &amp;&amp; (val &lt; offrange))</div><div class="line"><a name="l00155"></a><span class="lineno"> 155</span>&#160; {</div><div class="line"><a name="l00156"></a><span class="lineno"> 156</span>&#160; atomic_inc(histogram + win_pos);</div><div class="line"><a name="l00157"></a><span class="lineno"> 157</span>&#160; }</div><div class="line"><a name="l00158"></a><span class="lineno"> 158</span>&#160;}</div><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>
280<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>
281<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>
282<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>
283</div><!-- fragment -->
284</div>
285</div>
286<a class="anchor" id="aec6ec6157573195df9694109ebbb38ae"></a>
287<div class="memitem">
288<div class="memproto">
289 <table class="memname">
290 <tr>
291 <td class="memname">__kernel void hist_border_kernel_fixed </td>
292 <td>(</td>
293 <td class="paramtype">__global uchar *&#160;</td>
294 <td class="paramname"><em>input_ptr</em>, </td>
295 </tr>
296 <tr>
297 <td class="paramkey"></td>
298 <td></td>
299 <td class="paramtype">uint&#160;</td>
300 <td class="paramname"><em>input_stride_x</em>, </td>
301 </tr>
302 <tr>
303 <td class="paramkey"></td>
304 <td></td>
305 <td class="paramtype">uint&#160;</td>
306 <td class="paramname"><em>input_step_x</em>, </td>
307 </tr>
308 <tr>
309 <td class="paramkey"></td>
310 <td></td>
311 <td class="paramtype">uint&#160;</td>
312 <td class="paramname"><em>input_stride_y</em>, </td>
313 </tr>
314 <tr>
315 <td class="paramkey"></td>
316 <td></td>
317 <td class="paramtype">uint&#160;</td>
318 <td class="paramname"><em>input_step_y</em>, </td>
319 </tr>
320 <tr>
321 <td class="paramkey"></td>
322 <td></td>
323 <td class="paramtype">uint&#160;</td>
324 <td class="paramname"><em>input_offset_first_element_in_bytes</em>, </td>
325 </tr>
326 <tr>
327 <td class="paramkey"></td>
328 <td></td>
329 <td class="paramtype">__global uint *restrict&#160;</td>
330 <td class="paramname"><em>histogram</em>&#160;</td>
331 </tr>
332 <tr>
333 <td></td>
334 <td>)</td>
335 <td></td><td></td>
336 </tr>
337 </table>
338</div><div class="memdoc">
339
340<p>Calculate the histogram of an 8 bit grayscale image with bin size as 256 and window size as 1. </p>
341<p>Each thread will process one pixel using global atomic. When all work items in a work group are done the resulting local histograms are added to the global histogram using global atomics.</p>
342<dl class="section note"><dt>Note</dt><dd>The input image is represented as a two-dimensional array of type uchar. The output is represented as a one-dimensional uint array of 256</dd></dl>
343<dl class="params"><dt>Parameters</dt><dd>
344 <table class="params">
345 <tr><td class="paramdir">[in]</td><td class="paramname">input_ptr</td><td>Pointer to the first source image. Supported data types: U8 </td></tr>
346 <tr><td class="paramdir">[in]</td><td class="paramname">input_stride_x</td><td>Stride of the first source image in X dimension (in bytes) </td></tr>
347 <tr><td class="paramdir">[in]</td><td class="paramname">input_step_x</td><td>input_stride_x * number of elements along X processed per workitem(in bytes) </td></tr>
348 <tr><td class="paramdir">[in]</td><td class="paramname">input_stride_y</td><td>Stride of the first source image in Y dimension (in bytes) </td></tr>
349 <tr><td class="paramdir">[in]</td><td class="paramname">input_step_y</td><td>input_stride_y * number of elements along Y processed per workitem(in bytes) </td></tr>
350 <tr><td class="paramdir">[in]</td><td class="paramname">input_offset_first_element_in_bytes</td><td>The offset of the first element in the first source image </td></tr>
351 <tr><td class="paramdir">[out]</td><td class="paramname">histogram</td><td>The output buffer to hold histogram final result. Supported data types: U32 </td></tr>
352 </table>
353 </dd>
354</dl>
355
356<p>Definition at line <a class="el" href="histogram_8cl_source.xhtml#l00238">238</a> of file <a class="el" href="histogram_8cl_source.xhtml">histogram.cl</a>.</p>
357
358<p>References <a class="el" href="helpers_8h_source.xhtml#l00073">CONVERT_TO_IMAGE_STRUCT</a>, and <a class="el" href="helpers_8h_source.xhtml#l00097">Image::ptr</a>.</p>
359<div class="fragment"><div class="line"><a name="l00240"></a><span class="lineno"> 240</span>&#160;{</div><div class="line"><a name="l00241"></a><span class="lineno"> 241</span>&#160; <a class="code" href="struct_image.xhtml">Image</a> input_buffer = <a class="code" href="helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a>(input);</div><div class="line"><a name="l00242"></a><span class="lineno"> 242</span>&#160; atomic_inc(histogram + *input_buffer.<a class="code" href="struct_image.xhtml#acf52c23cbd7424606c10a606524e3e32">ptr</a>);</div><div class="line"><a name="l00243"></a><span class="lineno"> 243</span>&#160;}</div><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>
360<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>
361<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>
362</div><!-- fragment -->
363</div>
364</div>
365<a class="anchor" id="abc81d92c9655c4ec22fff9163b66279d"></a>
366<div class="memitem">
367<div class="memproto">
368 <table class="memname">
369 <tr>
370 <td class="memname">__kernel void hist_local_kernel </td>
371 <td>(</td>
372 <td class="paramtype">__global uchar *&#160;</td>
373 <td class="paramname"><em>input_ptr</em>, </td>
374 </tr>
375 <tr>
376 <td class="paramkey"></td>
377 <td></td>
378 <td class="paramtype">uint&#160;</td>
379 <td class="paramname"><em>input_stride_x</em>, </td>
380 </tr>
381 <tr>
382 <td class="paramkey"></td>
383 <td></td>
384 <td class="paramtype">uint&#160;</td>
385 <td class="paramname"><em>input_step_x</em>, </td>
386 </tr>
387 <tr>
388 <td class="paramkey"></td>
389 <td></td>
390 <td class="paramtype">uint&#160;</td>
391 <td class="paramname"><em>input_stride_y</em>, </td>
392 </tr>
393 <tr>
394 <td class="paramkey"></td>
395 <td></td>
396 <td class="paramtype">uint&#160;</td>
397 <td class="paramname"><em>input_step_y</em>, </td>
398 </tr>
399 <tr>
400 <td class="paramkey"></td>
401 <td></td>
402 <td class="paramtype">uint&#160;</td>
403 <td class="paramname"><em>input_offset_first_element_in_bytes</em>, </td>
404 </tr>
405 <tr>
406 <td class="paramkey"></td>
407 <td></td>
408 <td class="paramtype">__local uint *&#160;</td>
409 <td class="paramname"><em>histogram_local</em>, </td>
410 </tr>
411 <tr>
412 <td class="paramkey"></td>
413 <td></td>
414 <td class="paramtype">__global uint *restrict&#160;</td>
415 <td class="paramname"><em>histogram</em>, </td>
416 </tr>
417 <tr>
418 <td class="paramkey"></td>
419 <td></td>
420 <td class="paramtype">uint&#160;</td>
421 <td class="paramname"><em>num_bins</em>, </td>
422 </tr>
423 <tr>
424 <td class="paramkey"></td>
425 <td></td>
426 <td class="paramtype">uint&#160;</td>
427 <td class="paramname"><em>offset</em>, </td>
428 </tr>
429 <tr>
430 <td class="paramkey"></td>
431 <td></td>
432 <td class="paramtype">uint&#160;</td>
433 <td class="paramname"><em>range</em>, </td>
434 </tr>
435 <tr>
436 <td class="paramkey"></td>
437 <td></td>
438 <td class="paramtype">uint&#160;</td>
439 <td class="paramname"><em>offrange</em>&#160;</td>
440 </tr>
441 <tr>
442 <td></td>
443 <td>)</td>
444 <td></td><td></td>
445 </tr>
446 </table>
447</div><div class="memdoc">
448
449<p>Calculate the histogram of an 8 bit grayscale image. </p>
450<p>Each thread will process 16 pixels and use one local atomic operation per pixel. When all work items in a work group are done the resulting local histograms are added to the global histogram using global atomics.</p>
451<dl class="section note"><dt>Note</dt><dd>The input image is represented as a two-dimensional array of type uchar. The output is represented as a one-dimensional uint array of length of num_bins</dd></dl>
452<dl class="params"><dt>Parameters</dt><dd>
453 <table class="params">
454 <tr><td class="paramdir">[in]</td><td class="paramname">input_ptr</td><td>Pointer to the first source image. Supported data types: U8 </td></tr>
455 <tr><td class="paramdir">[in]</td><td class="paramname">input_stride_x</td><td>Stride of the first source image in X dimension (in bytes) </td></tr>
456 <tr><td class="paramdir">[in]</td><td class="paramname">input_step_x</td><td>input_stride_x * number of elements along X processed per workitem(in bytes) </td></tr>
457 <tr><td class="paramdir">[in]</td><td class="paramname">input_stride_y</td><td>Stride of the first source image in Y dimension (in bytes) </td></tr>
458 <tr><td class="paramdir">[in]</td><td class="paramname">input_step_y</td><td>input_stride_y * number of elements along Y processed per workitem(in bytes) </td></tr>
459 <tr><td class="paramdir">[in]</td><td class="paramname">input_offset_first_element_in_bytes</td><td>The offset of the first element in the first source image </td></tr>
460 <tr><td class="paramdir">[in]</td><td class="paramname">histogram_local</td><td>The local buffer to hold histogram result in per workgroup. Supported data types: U32 </td></tr>
461 <tr><td class="paramdir">[out]</td><td class="paramname">histogram</td><td>The output buffer to hold histogram final result. Supported data types: U32 </td></tr>
462 <tr><td class="paramdir">[out]</td><td class="paramname">num_bins</td><td>The number of bins </td></tr>
463 <tr><td class="paramdir">[out]</td><td class="paramname">offset</td><td>The start of values to use (inclusive) </td></tr>
464 <tr><td class="paramdir">[out]</td><td class="paramname">range</td><td>The range of a bin </td></tr>
465 <tr><td class="paramdir">[out]</td><td class="paramname">offrange</td><td>The maximum value (exclusive) </td></tr>
466 </table>
467 </dd>
468</dl>
469
470<p>Definition at line <a class="el" href="histogram_8cl_source.xhtml#l00068">68</a> of file <a class="el" href="histogram_8cl_source.xhtml">histogram.cl</a>.</p>
471
472<p>References <a class="el" href="helpers_8h_source.xhtml#l00073">CONVERT_TO_IMAGE_STRUCT</a>, <a class="el" href="helpers_8h_source.xhtml#l00097">Image::ptr</a>, and <a class="el" href="histogram_8cl_source.xhtml#l00026">VATOMIC_INC16</a>.</p>
473<div class="fragment"><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160;{</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>&#160; <a class="code" href="struct_image.xhtml">Image</a> input_buffer = <a class="code" href="helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a>(input);</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160; uint local_id_x = get_local_id(0);</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160;</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160; uint local_x_size = get_local_size(0);</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span>&#160;</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>&#160; <span class="keywordflow">if</span>(num_bins &gt; local_x_size)</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>&#160; {</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>&#160; <span class="keywordflow">for</span>(<span class="keywordtype">int</span> i = local_id_x; i &lt; num_bins; i += local_x_size)</div><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; histogram_local[i] = 0;</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>&#160; }</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160; }</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>&#160; <span class="keywordflow">else</span></div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>&#160; {</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160; <span class="keywordflow">if</span>(local_id_x &lt;= num_bins)</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160; {</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160; histogram_local[local_id_x] = 0;</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>&#160; }</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>&#160; }</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160;</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>&#160; uint16 vals = convert_uint16(vload16(0, input_buffer.<a class="code" href="struct_image.xhtml#acf52c23cbd7424606c10a606524e3e32">ptr</a>));</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>&#160;</div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>&#160; uint16 win_pos = select(num_bins, ((vals - <a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>) * num_bins) / range, (vals &gt;= <a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a> &amp;&amp; vals &lt; offrange));</div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>&#160;</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span>&#160; barrier(CLK_LOCAL_MEM_FENCE);</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>&#160; <a class="code" href="histogram_8cl.xhtml#a2c8a35cfde24ca7728709200962e1a91">VATOMIC_INC16</a>(histogram_local, win_pos);</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>&#160; barrier(CLK_LOCAL_MEM_FENCE);</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span>&#160;</div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>&#160; <span class="keywordflow">if</span>(num_bins &gt; local_x_size)</div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>&#160; {</div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>&#160; <span class="keywordflow">for</span>(<span class="keywordtype">int</span> i = local_id_x; i &lt; num_bins; i += local_x_size)</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>&#160; {</div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>&#160; atomic_add(histogram + i, histogram_local[i]);</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>&#160; }</div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>&#160; }</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>&#160; <span class="keywordflow">else</span></div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>&#160; {</div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>&#160; <span class="keywordflow">if</span>(local_id_x &lt;= num_bins)</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>&#160; {</div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>&#160; atomic_add(histogram + local_id_x, histogram_local[local_id_x]);</div><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; }</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>&#160;}</div><div class="ttc" id="histogram_8cl_xhtml_a2c8a35cfde24ca7728709200962e1a91"><div class="ttname"><a href="histogram_8cl.xhtml#a2c8a35cfde24ca7728709200962e1a91">VATOMIC_INC16</a></div><div class="ttdeci">#define VATOMIC_INC16(histogram, win_pos)</div><div class="ttdef"><b>Definition:</b> <a href="histogram_8cl_source.xhtml#l00026">histogram.cl:26</a></div></div>
474<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>
475<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>
476<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>
477<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>
478</div><!-- fragment -->
479</div>
480</div>
481<a class="anchor" id="a7c8051ab952a597e66090d77f4dc60e4"></a>
482<div class="memitem">
483<div class="memproto">
484 <table class="memname">
485 <tr>
486 <td class="memname">__kernel void hist_local_kernel_fixed </td>
487 <td>(</td>
488 <td class="paramtype">__global uchar *&#160;</td>
489 <td class="paramname"><em>input_ptr</em>, </td>
490 </tr>
491 <tr>
492 <td class="paramkey"></td>
493 <td></td>
494 <td class="paramtype">uint&#160;</td>
495 <td class="paramname"><em>input_stride_x</em>, </td>
496 </tr>
497 <tr>
498 <td class="paramkey"></td>
499 <td></td>
500 <td class="paramtype">uint&#160;</td>
501 <td class="paramname"><em>input_step_x</em>, </td>
502 </tr>
503 <tr>
504 <td class="paramkey"></td>
505 <td></td>
506 <td class="paramtype">uint&#160;</td>
507 <td class="paramname"><em>input_stride_y</em>, </td>
508 </tr>
509 <tr>
510 <td class="paramkey"></td>
511 <td></td>
512 <td class="paramtype">uint&#160;</td>
513 <td class="paramname"><em>input_step_y</em>, </td>
514 </tr>
515 <tr>
516 <td class="paramkey"></td>
517 <td></td>
518 <td class="paramtype">uint&#160;</td>
519 <td class="paramname"><em>input_offset_first_element_in_bytes</em>, </td>
520 </tr>
521 <tr>
522 <td class="paramkey"></td>
523 <td></td>
524 <td class="paramtype">__local uint *&#160;</td>
525 <td class="paramname"><em>histogram_local</em>, </td>
526 </tr>
527 <tr>
528 <td class="paramkey"></td>
529 <td></td>
530 <td class="paramtype">__global uint *restrict&#160;</td>
531 <td class="paramname"><em>histogram</em>&#160;</td>
532 </tr>
533 <tr>
534 <td></td>
535 <td>)</td>
536 <td></td><td></td>
537 </tr>
538 </table>
539</div><div class="memdoc">
540
541<p>Calculate the histogram of an 8 bit grayscale image with bin size of 256 and window size of 1. </p>
542<p>Each thread will process 16 pixels and use one local atomic operation per pixel. When all work items in a work group are done the resulting local histograms are added to the global histogram using global atomics.</p>
543<dl class="section note"><dt>Note</dt><dd>The input image is represented as a two-dimensional array of type uchar. The output is represented as a one-dimensional uint array of 256 elements</dd></dl>
544<dl class="params"><dt>Parameters</dt><dd>
545 <table class="params">
546 <tr><td class="paramdir">[in]</td><td class="paramname">input_ptr</td><td>Pointer to the first source image. Supported data types: U8 </td></tr>
547 <tr><td class="paramdir">[in]</td><td class="paramname">input_stride_x</td><td>Stride of the first source image in X dimension (in bytes) </td></tr>
548 <tr><td class="paramdir">[in]</td><td class="paramname">input_step_x</td><td>input_stride_x * number of elements along X processed per workitem(in bytes) </td></tr>
549 <tr><td class="paramdir">[in]</td><td class="paramname">input_stride_y</td><td>Stride of the first source image in Y dimension (in bytes) </td></tr>
550 <tr><td class="paramdir">[in]</td><td class="paramname">input_step_y</td><td>input_stride_y * number of elements along Y processed per workitem(in bytes) </td></tr>
551 <tr><td class="paramdir">[in]</td><td class="paramname">input_offset_first_element_in_bytes</td><td>The offset of the first element in the first source image </td></tr>
552 <tr><td class="paramdir">[in]</td><td class="paramname">histogram_local</td><td>The local buffer to hold histogram result in per workgroup. Supported data types: U32 </td></tr>
553 <tr><td class="paramdir">[out]</td><td class="paramname">histogram</td><td>The output buffer to hold histogram final result. Supported data types: U32 </td></tr>
554 </table>
555 </dd>
556</dl>
557
558<p>Definition at line <a class="el" href="histogram_8cl_source.xhtml#l00178">178</a> of file <a class="el" href="histogram_8cl_source.xhtml">histogram.cl</a>.</p>
559
560<p>References <a class="el" href="helpers_8h_source.xhtml#l00073">CONVERT_TO_IMAGE_STRUCT</a>, and <a class="el" href="helpers_8h_source.xhtml#l00097">Image::ptr</a>.</p>
561<div class="fragment"><div class="line"><a name="l00181"></a><span class="lineno"> 181</span>&#160;{</div><div class="line"><a name="l00182"></a><span class="lineno"> 182</span>&#160; <a class="code" href="struct_image.xhtml">Image</a> input_buffer = <a class="code" href="helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a>(input);</div><div class="line"><a name="l00183"></a><span class="lineno"> 183</span>&#160;</div><div class="line"><a name="l00184"></a><span class="lineno"> 184</span>&#160; uint local_index = get_local_id(0);</div><div class="line"><a name="l00185"></a><span class="lineno"> 185</span>&#160; uint local_x_size = get_local_size(0);</div><div class="line"><a name="l00186"></a><span class="lineno"> 186</span>&#160;</div><div class="line"><a name="l00187"></a><span class="lineno"> 187</span>&#160; <span class="keywordflow">for</span>(<span class="keywordtype">int</span> i = local_index; i &lt; 256; i += local_x_size)</div><div class="line"><a name="l00188"></a><span class="lineno"> 188</span>&#160; {</div><div class="line"><a name="l00189"></a><span class="lineno"> 189</span>&#160; histogram_local[i] = 0;</div><div class="line"><a name="l00190"></a><span class="lineno"> 190</span>&#160; }</div><div class="line"><a name="l00191"></a><span class="lineno"> 191</span>&#160;</div><div class="line"><a name="l00192"></a><span class="lineno"> 192</span>&#160; uint16 vals = convert_uint16(vload16(0, input_buffer.<a class="code" href="struct_image.xhtml#acf52c23cbd7424606c10a606524e3e32">ptr</a>));</div><div class="line"><a name="l00193"></a><span class="lineno"> 193</span>&#160;</div><div class="line"><a name="l00194"></a><span class="lineno"> 194</span>&#160; barrier(CLK_LOCAL_MEM_FENCE);</div><div class="line"><a name="l00195"></a><span class="lineno"> 195</span>&#160;</div><div class="line"><a name="l00196"></a><span class="lineno"> 196</span>&#160; atomic_inc(histogram_local + vals.s0);</div><div class="line"><a name="l00197"></a><span class="lineno"> 197</span>&#160; atomic_inc(histogram_local + vals.s1);</div><div class="line"><a name="l00198"></a><span class="lineno"> 198</span>&#160; atomic_inc(histogram_local + vals.s2);</div><div class="line"><a name="l00199"></a><span class="lineno"> 199</span>&#160; atomic_inc(histogram_local + vals.s3);</div><div class="line"><a name="l00200"></a><span class="lineno"> 200</span>&#160; atomic_inc(histogram_local + vals.s4);</div><div class="line"><a name="l00201"></a><span class="lineno"> 201</span>&#160; atomic_inc(histogram_local + vals.s5);</div><div class="line"><a name="l00202"></a><span class="lineno"> 202</span>&#160; atomic_inc(histogram_local + vals.s6);</div><div class="line"><a name="l00203"></a><span class="lineno"> 203</span>&#160; atomic_inc(histogram_local + vals.s7);</div><div class="line"><a name="l00204"></a><span class="lineno"> 204</span>&#160; atomic_inc(histogram_local + vals.s8);</div><div class="line"><a name="l00205"></a><span class="lineno"> 205</span>&#160; atomic_inc(histogram_local + vals.s9);</div><div class="line"><a name="l00206"></a><span class="lineno"> 206</span>&#160; atomic_inc(histogram_local + vals.sa);</div><div class="line"><a name="l00207"></a><span class="lineno"> 207</span>&#160; atomic_inc(histogram_local + vals.sb);</div><div class="line"><a name="l00208"></a><span class="lineno"> 208</span>&#160; atomic_inc(histogram_local + vals.sc);</div><div class="line"><a name="l00209"></a><span class="lineno"> 209</span>&#160; atomic_inc(histogram_local + vals.sd);</div><div class="line"><a name="l00210"></a><span class="lineno"> 210</span>&#160; atomic_inc(histogram_local + vals.se);</div><div class="line"><a name="l00211"></a><span class="lineno"> 211</span>&#160; atomic_inc(histogram_local + vals.sf);</div><div class="line"><a name="l00212"></a><span class="lineno"> 212</span>&#160;</div><div class="line"><a name="l00213"></a><span class="lineno"> 213</span>&#160; barrier(CLK_LOCAL_MEM_FENCE);</div><div class="line"><a name="l00214"></a><span class="lineno"> 214</span>&#160;</div><div class="line"><a name="l00215"></a><span class="lineno"> 215</span>&#160; <span class="keywordflow">for</span>(<span class="keywordtype">int</span> i = local_index; i &lt; 256; i += local_x_size)</div><div class="line"><a name="l00216"></a><span class="lineno"> 216</span>&#160; {</div><div class="line"><a name="l00217"></a><span class="lineno"> 217</span>&#160; atomic_add(histogram + i, histogram_local[i]);</div><div class="line"><a name="l00218"></a><span class="lineno"> 218</span>&#160; }</div><div class="line"><a name="l00219"></a><span class="lineno"> 219</span>&#160;}</div><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>
562<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>
563<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>
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