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 (at) 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 * https://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 29 static int 30 png_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 } 40
