1/* contrib/arm-neon/android-ndk.c
 2 *
 3 * Copyright (c) 2014 Glenn Randers-Pehrson
 4 * Written by John Bowler, 2014.
 5 * Last changed in libpng 1.6.10 [March 6, 2014]
 6 *
 7 * This code is released under the libpng license.
 8 * For conditions of distribution and use, see the disclaimer
 9 * and license in png.h
10 *
11 * SEE contrib/arm-neon/README before reporting bugs
12 *
13 * STATUS: COMPILED, UNTESTED
14 * BUG REPORTS: png-mng-implement@sourceforge.net
15 *
16 * png_have_neon implemented for the Android NDK, see:
17 *
18 * Documentation:
19 *    http://www.kandroid.org/ndk/docs/CPU-ARM-NEON.html
20 *    http://code.google.com/p/android/issues/detail?id=49065
21 *
22 * NOTE: this requires that libpng is built against the Android NDK and linked
23 * with an implementation of the Android ARM 'cpu-features' library.  The code
24 * has been compiled only, not linked: no version of the library has been found,
25 * only the header files exist in the NDK.
26 */
27#include <cpu-features.h>
28
29static int
30png_have_neon(png_structp png_ptr)
31{
32   /* This is a whole lot easier than the linux code, however it is probably
33    * implemented as below, therefore it is better to cache the result (these
34    * function calls may be slow!)
35    */
36   PNG_UNUSED(png_ptr)
37   return android_getCpuFamily() == ANDROID_CPU_FAMILY_ARM &&
38      (android_getCpuFeatures() & ANDROID_CPU_ARM_FEATURE_NEON) != 0;
39}