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<html><!-- Created using the cpp_pretty_printer from the dlib C++ library. See http://dlib.net for updates. --><head><title>dlib C++ Library - arm_init.c</title></head><body bgcolor='white'><pre>
<font color='#009900'>/* arm_init.c - NEON optimised filter functions
*
* Copyright (c) 2013 Glenn Randers-Pehrson
* Written by Mans Rullgard, 2011.
* Last changed in libpng 1.6.6 [September 16, 2013]
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*/</font>
<font color='#009900'>/* Below, after checking __linux__, various non-C90 POSIX 1003.1 functions are
* called.
*/</font>
<font color='#0000FF'>#define</font> _POSIX_SOURCE <font color='#979000'>1</font>
<font color='#0000FF'>#include</font> "<a style='text-decoration:none' href='../pngpriv.h.html'>../pngpriv.h</a>"
<font color='#0000FF'>#ifdef</font> PNG_READ_SUPPORTED
<font color='#0000FF'>#if</font> PNG_ARM_NEON_OPT <font color='#5555FF'>&gt;</font> <font color='#979000'>0</font>
<font color='#0000FF'>#ifdef</font> PNG_ARM_NEON_CHECK_SUPPORTED <font color='#009900'>/* Do run-time checks */</font>
<font color='#0000FF'>#include</font> <font color='#5555FF'>&lt;</font>signal.h<font color='#5555FF'>&gt;</font> <font color='#009900'>/* for sig_atomic_t */</font>
<font color='#0000FF'>#ifdef</font> __ANDROID__
<font color='#009900'>/* Linux provides access to information about CPU capabilites via
* /proc/self/auxv, however Android blocks this while still claiming to be
* Linux. The Andoid NDK, however, provides appropriate support.
*
* Documentation: http://www.kandroid.org/ndk/docs/CPU-ARM-NEON.html
*/</font>
<font color='#0000FF'>#include</font> <font color='#5555FF'>&lt;</font>cpu<font color='#5555FF'>-</font>features.h<font color='#5555FF'>&gt;</font>
<font color='#0000FF'>static</font> <font color='#0000FF'><u>int</u></font>
<b><a name='png_have_neon'></a>png_have_neon</b><font face='Lucida Console'>(</font>png_structp png_ptr<font face='Lucida Console'>)</font>
<b>{</b>
<font color='#009900'>/* This is a whole lot easier than the mess below, however it is probably
* implemented as below, therefore it is better to cache the result (these
* function calls may be slow!)
*/</font>
<font color='#BB00BB'>PNG_UNUSED</font><font face='Lucida Console'>(</font>png_ptr<font face='Lucida Console'>)</font>
<font color='#0000FF'>return</font> <font color='#BB00BB'>android_getCpuFamily</font><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font> <font color='#5555FF'>=</font><font color='#5555FF'>=</font> ANDROID_CPU_FAMILY_ARM <font color='#5555FF'>&amp;</font><font color='#5555FF'>&amp;</font>
<font face='Lucida Console'>(</font><font color='#BB00BB'>android_getCpuFeatures</font><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font> <font color='#5555FF'>&amp;</font> ANDROID_CPU_ARM_FEATURE_NEON<font face='Lucida Console'>)</font> <font color='#5555FF'>!</font><font color='#5555FF'>=</font> <font color='#979000'>0</font>;
<b>}</b>
<font color='#0000FF'>#elif</font> defined<font face='Lucida Console'>(</font>__linux__<font face='Lucida Console'>)</font>
<font color='#009900'>/* The generic __linux__ implementation requires reading /proc/self/auxv and
* looking at each element for one that records NEON capabilities.
*/</font>
<font color='#0000FF'>#include</font> <font color='#5555FF'>&lt;</font>unistd.h<font color='#5555FF'>&gt;</font> <font color='#009900'>/* for POSIX 1003.1 */</font>
<font color='#0000FF'>#include</font> <font color='#5555FF'>&lt;</font>errno.h<font color='#5555FF'>&gt;</font> <font color='#009900'>/* for EINTR */</font>
<font color='#0000FF'>#include</font> <font color='#5555FF'>&lt;</font>sys<font color='#5555FF'>/</font>types.h<font color='#5555FF'>&gt;</font>
<font color='#0000FF'>#include</font> <font color='#5555FF'>&lt;</font>sys<font color='#5555FF'>/</font>stat.h<font color='#5555FF'>&gt;</font>
<font color='#0000FF'>#include</font> <font color='#5555FF'>&lt;</font>fcntl.h<font color='#5555FF'>&gt;</font>
<font color='#0000FF'>#include</font> <font color='#5555FF'>&lt;</font>elf.h<font color='#5555FF'>&gt;</font>
<font color='#0000FF'>#include</font> <font color='#5555FF'>&lt;</font>asm<font color='#5555FF'>/</font>hwcap.h<font color='#5555FF'>&gt;</font>
<font color='#009900'>/* A read call may be interrupted, in which case it returns -1 and sets errno to
* EINTR if nothing was done, otherwise (if something was done) a partial read
* may result.
*/</font>
<font color='#0000FF'>static</font> <font color='#0000FF'><u>size_t</u></font>
<b><a name='safe_read'></a>safe_read</b><font face='Lucida Console'>(</font>png_structp png_ptr, <font color='#0000FF'><u>int</u></font> fd, <font color='#0000FF'><u>void</u></font> <font color='#5555FF'>*</font>buffer_in, <font color='#0000FF'><u>size_t</u></font> nbytes<font face='Lucida Console'>)</font>
<b>{</b>
<font color='#0000FF'><u>size_t</u></font> ntotal <font color='#5555FF'>=</font> <font color='#979000'>0</font>;
<font color='#0000FF'><u>char</u></font> <font color='#5555FF'>*</font>buffer <font color='#5555FF'>=</font> <font color='#BB00BB'>png_voidcast</font><font face='Lucida Console'>(</font><font color='#0000FF'><u>char</u></font><font color='#5555FF'>*</font>, buffer_in<font face='Lucida Console'>)</font>;
<font color='#0000FF'>while</font> <font face='Lucida Console'>(</font>nbytes <font color='#5555FF'>&gt;</font> <font color='#979000'>0</font><font face='Lucida Console'>)</font>
<b>{</b>
<font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>int</u></font> nread;
<font color='#0000FF'><u>int</u></font> iread;
<font color='#009900'>/* Passing nread &gt; INT_MAX to read is implementation defined in POSIX
* 1003.1, therefore despite the unsigned argument portable code must
* limit the value to INT_MAX!
*/</font>
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>nbytes <font color='#5555FF'>&gt;</font> INT_MAX<font face='Lucida Console'>)</font>
nread <font color='#5555FF'>=</font> INT_MAX;
<font color='#0000FF'>else</font>
nread <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font><font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>int</u></font><font face='Lucida Console'>)</font><font color='#009900'>/*SAFE*/</font>nbytes;
iread <font color='#5555FF'>=</font> <font color='#BB00BB'>read</font><font face='Lucida Console'>(</font>fd, buffer, nread<font face='Lucida Console'>)</font>;
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>iread <font color='#5555FF'>=</font><font color='#5555FF'>=</font> <font color='#5555FF'>-</font><font color='#979000'>1</font><font face='Lucida Console'>)</font>
<b>{</b>
<font color='#009900'>/* This is the devil in the details, a read can terminate early with 0
* bytes read because of EINTR, yet it still returns -1 otherwise end
* of file cannot be distinguished.
*/</font>
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>errno <font color='#5555FF'>!</font><font color='#5555FF'>=</font> EINTR<font face='Lucida Console'>)</font>
<b>{</b>
<font color='#BB00BB'>png_warning</font><font face='Lucida Console'>(</font>png_ptr, "<font color='#CC0000'>/proc read failed</font>"<font face='Lucida Console'>)</font>;
<font color='#0000FF'>return</font> <font color='#979000'>0</font>; <font color='#009900'>/* I.e. a permanent failure */</font>
<b>}</b>
<b>}</b>
<font color='#0000FF'>else</font> <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>iread <font color='#5555FF'>&lt;</font> <font color='#979000'>0</font><font face='Lucida Console'>)</font>
<b>{</b>
<font color='#009900'>/* Not a valid 'read' result: */</font>
<font color='#BB00BB'>png_warning</font><font face='Lucida Console'>(</font>png_ptr, "<font color='#CC0000'>OS /proc read bug</font>"<font face='Lucida Console'>)</font>;
<font color='#0000FF'>return</font> <font color='#979000'>0</font>;
<b>}</b>
<font color='#0000FF'>else</font> <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>iread <font color='#5555FF'>&gt;</font> <font color='#979000'>0</font><font face='Lucida Console'>)</font>
<b>{</b>
<font color='#009900'>/* Continue reading until a permanent failure, or EOF */</font>
buffer <font color='#5555FF'>+</font><font color='#5555FF'>=</font> iread;
nbytes <font color='#5555FF'>-</font><font color='#5555FF'>=</font> <font face='Lucida Console'>(</font><font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>int</u></font><font face='Lucida Console'>)</font><font color='#009900'>/*SAFE*/</font>iread;
ntotal <font color='#5555FF'>+</font><font color='#5555FF'>=</font> <font face='Lucida Console'>(</font><font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>int</u></font><font face='Lucida Console'>)</font><font color='#009900'>/*SAFE*/</font>iread;
<b>}</b>
<font color='#0000FF'>else</font>
<font color='#0000FF'>return</font> ntotal;
<b>}</b>
<font color='#0000FF'>return</font> ntotal; <font color='#009900'>/* nbytes == 0 */</font>
<b>}</b>
<font color='#0000FF'>static</font> <font color='#0000FF'><u>int</u></font>
<b><a name='png_have_neon'></a>png_have_neon</b><font face='Lucida Console'>(</font>png_structp png_ptr<font face='Lucida Console'>)</font>
<b>{</b>
<font color='#0000FF'><u>int</u></font> fd <font color='#5555FF'>=</font> <font color='#BB00BB'>open</font><font face='Lucida Console'>(</font>"<font color='#CC0000'>/proc/self/auxv</font>", O_RDONLY<font face='Lucida Console'>)</font>;
Elf32_auxv_t aux;
<font color='#009900'>/* Failsafe: failure to open means no NEON */</font>
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>fd <font color='#5555FF'>=</font><font color='#5555FF'>=</font> <font color='#5555FF'>-</font><font color='#979000'>1</font><font face='Lucida Console'>)</font>
<b>{</b>
<font color='#BB00BB'>png_warning</font><font face='Lucida Console'>(</font>png_ptr, "<font color='#CC0000'>/proc/self/auxv open failed</font>"<font face='Lucida Console'>)</font>;
<font color='#0000FF'>return</font> <font color='#979000'>0</font>;
<b>}</b>
<font color='#0000FF'>while</font> <font face='Lucida Console'>(</font><font color='#BB00BB'>safe_read</font><font face='Lucida Console'>(</font>png_ptr, fd, <font color='#5555FF'>&amp;</font>aux, <font color='#0000FF'>sizeof</font> aux<font face='Lucida Console'>)</font> <font color='#5555FF'>=</font><font color='#5555FF'>=</font> <font color='#0000FF'>sizeof</font> aux<font face='Lucida Console'>)</font>
<b>{</b>
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>aux.a_type <font color='#5555FF'>=</font><font color='#5555FF'>=</font> AT_HWCAP <font color='#5555FF'>&amp;</font><font color='#5555FF'>&amp;</font> <font face='Lucida Console'>(</font>aux.a_un.a_val <font color='#5555FF'>&amp;</font> HWCAP_NEON<font face='Lucida Console'>)</font> <font color='#5555FF'>!</font><font color='#5555FF'>=</font> <font color='#979000'>0</font><font face='Lucida Console'>)</font>
<b>{</b>
<font color='#BB00BB'>close</font><font face='Lucida Console'>(</font>fd<font face='Lucida Console'>)</font>;
<font color='#0000FF'>return</font> <font color='#979000'>1</font>;
<b>}</b>
<b>}</b>
<font color='#BB00BB'>close</font><font face='Lucida Console'>(</font>fd<font face='Lucida Console'>)</font>;
<font color='#0000FF'>return</font> <font color='#979000'>0</font>;
<b>}</b>
<font color='#0000FF'>#else</font>
<font color='#009900'>/* We don't know how to do a run-time check on this system */</font>
# error "<font color='#CC0000'>no support for run-time ARM NEON checks</font>"
<font color='#0000FF'>#endif</font> <font color='#009900'>/* OS checks */</font>
<font color='#0000FF'>#endif</font> <font color='#009900'>/* PNG_ARM_NEON_CHECK_SUPPORTED */</font>
<font color='#0000FF'>#ifndef</font> PNG_ALIGNED_MEMORY_SUPPORTED
# error "<font color='#CC0000'>ALIGNED_MEMORY is required; set: -DPNG_ALIGNED_MEMORY_SUPPORTED</font>"
<font color='#0000FF'>#endif</font>
<font color='#0000FF'><u>void</u></font>
<b><a name='png_init_filter_functions_neon'></a>png_init_filter_functions_neon</b><font face='Lucida Console'>(</font>png_structp pp, <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>int</u></font> bpp<font face='Lucida Console'>)</font>
<b>{</b>
<font color='#009900'>/* The switch statement is compiled in for ARM_NEON_API, the call to
* png_have_neon is compiled in for ARM_NEON_CHECK. If both are defined
* the check is only performed if the API has not set the NEON option on
* or off explicitly. In this case the check controls what happens.
*
* If the CHECK is not compiled in and the option is UNSET the behavior prior
* to 1.6.7 was to use the NEON code - this was a bug caused by having the
* wrong order of the 'ON' and 'default' cases. UNSET now defaults to OFF,
* as documented in png.h
*/</font>
<font color='#0000FF'>#ifdef</font> PNG_ARM_NEON_API_SUPPORTED
<font color='#0000FF'>switch</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>pp<font color='#5555FF'>-</font><font color='#5555FF'>&gt;</font>options <font color='#5555FF'>&gt;</font><font color='#5555FF'>&gt;</font> PNG_ARM_NEON<font face='Lucida Console'>)</font> <font color='#5555FF'>&amp;</font> <font color='#979000'>3</font><font face='Lucida Console'>)</font>
<b>{</b>
<font color='#0000FF'>case</font> PNG_OPTION_UNSET:
<font color='#009900'>/* Allow the run-time check to execute if it has been enabled -
* thus both API and CHECK can be turned on. If it isn't supported
* this case will fall through to the 'default' below, which just
* returns.
*/</font>
<font color='#0000FF'>#endif</font> <font color='#009900'>/* PNG_ARM_NEON_API_SUPPORTED */</font>
<font color='#0000FF'>#ifdef</font> PNG_ARM_NEON_CHECK_SUPPORTED
<b>{</b>
<font color='#0000FF'>static</font> <font color='#0000FF'>volatile</font> sig_atomic_t no_neon <font color='#5555FF'>=</font> <font color='#5555FF'>-</font><font color='#979000'>1</font>; <font color='#009900'>/* not checked */</font>
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>no_neon <font color='#5555FF'>&lt;</font> <font color='#979000'>0</font><font face='Lucida Console'>)</font>
no_neon <font color='#5555FF'>=</font> <font color='#5555FF'>!</font><font color='#BB00BB'>png_have_neon</font><font face='Lucida Console'>(</font>pp<font face='Lucida Console'>)</font>;
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>no_neon<font face='Lucida Console'>)</font>
<font color='#0000FF'>return</font>;
<b>}</b>
<font color='#0000FF'>#ifdef</font> PNG_ARM_NEON_API_SUPPORTED
<font color='#0000FF'>break</font>;
<font color='#0000FF'>#endif</font>
<font color='#0000FF'>#endif</font> <font color='#009900'>/* PNG_ARM_NEON_CHECK_SUPPORTED */</font>
<font color='#0000FF'>#ifdef</font> PNG_ARM_NEON_API_SUPPORTED
<font color='#0000FF'>default</font>: <font color='#009900'>/* OFF or INVALID */</font>
<font color='#0000FF'>return</font>;
<font color='#0000FF'>case</font> PNG_OPTION_ON:
<font color='#009900'>/* Option turned on */</font>
<font color='#0000FF'>break</font>;
<b>}</b>
<font color='#0000FF'>#endif</font>
<font color='#009900'>/* IMPORTANT: any new external functions used here must be declared using
* PNG_INTERNAL_FUNCTION in ../pngpriv.h. This is required so that the
* 'prefix' option to configure works:
*
* ./configure --with-libpng-prefix=foobar_
*
* Verify you have got this right by running the above command, doing a build
* and examining pngprefix.h; it must contain a #define for every external
* function you add. (Notice that this happens automatically for the
* initialization function.)
*/</font>
pp<font color='#5555FF'>-</font><font color='#5555FF'>&gt;</font>read_filter[PNG_FILTER_VALUE_UP<font color='#5555FF'>-</font><font color='#979000'>1</font>] <font color='#5555FF'>=</font> png_read_filter_row_up_neon;
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>bpp <font color='#5555FF'>=</font><font color='#5555FF'>=</font> <font color='#979000'>3</font><font face='Lucida Console'>)</font>
<b>{</b>
pp<font color='#5555FF'>-</font><font color='#5555FF'>&gt;</font>read_filter[PNG_FILTER_VALUE_SUB<font color='#5555FF'>-</font><font color='#979000'>1</font>] <font color='#5555FF'>=</font> png_read_filter_row_sub3_neon;
pp<font color='#5555FF'>-</font><font color='#5555FF'>&gt;</font>read_filter[PNG_FILTER_VALUE_AVG<font color='#5555FF'>-</font><font color='#979000'>1</font>] <font color='#5555FF'>=</font> png_read_filter_row_avg3_neon;
pp<font color='#5555FF'>-</font><font color='#5555FF'>&gt;</font>read_filter[PNG_FILTER_VALUE_PAETH<font color='#5555FF'>-</font><font color='#979000'>1</font>] <font color='#5555FF'>=</font>
png_read_filter_row_paeth3_neon;
<b>}</b>
<font color='#0000FF'>else</font> <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>bpp <font color='#5555FF'>=</font><font color='#5555FF'>=</font> <font color='#979000'>4</font><font face='Lucida Console'>)</font>
<b>{</b>
pp<font color='#5555FF'>-</font><font color='#5555FF'>&gt;</font>read_filter[PNG_FILTER_VALUE_SUB<font color='#5555FF'>-</font><font color='#979000'>1</font>] <font color='#5555FF'>=</font> png_read_filter_row_sub4_neon;
pp<font color='#5555FF'>-</font><font color='#5555FF'>&gt;</font>read_filter[PNG_FILTER_VALUE_AVG<font color='#5555FF'>-</font><font color='#979000'>1</font>] <font color='#5555FF'>=</font> png_read_filter_row_avg4_neon;
pp<font color='#5555FF'>-</font><font color='#5555FF'>&gt;</font>read_filter[PNG_FILTER_VALUE_PAETH<font color='#5555FF'>-</font><font color='#979000'>1</font>] <font color='#5555FF'>=</font>
png_read_filter_row_paeth4_neon;
<b>}</b>
<b>}</b>
<font color='#0000FF'>#endif</font> <font color='#009900'>/* PNG_ARM_NEON_OPT &gt; 0 */</font>
<font color='#0000FF'>#endif</font> <font color='#009900'>/* PNG_READ_SUPPORTED */</font>
</pre></body></html>