1 /* contrib/arm-neon/android-ndk.c 2 * 3 * Copyright (c) 2014 Glenn Randers-Pehrson 4 * Written by John Bowler, 2014. 5 * 6 * This code is released under the libpng license. 7 * For conditions of distribution and use, see the disclaimer 8 * and license in png.h 9 * 10 * SEE contrib/arm-neon/README before reporting bugs 11 * 12 * STATUS: COMPILED, UNTESTED 13 * BUG REPORTS: [email protected] 14 * 15 * png_have_neon implemented for the Android NDK, see: 16 * 17 * Documentation: 18 * http://www.kandroid.org/ndk/docs/CPU-ARM-NEON.html 19 * https://code.google.com/p/android/issues/detail?id=49065 20 * 21 * NOTE: this requires that libpng is built against the Android NDK and linked 22 * with an implementation of the Android ARM 'cpu-features' library. The code 23 * has been compiled only, not linked: no version of the library has been found, 24 * only the header files exist in the NDK. 25 */ 26 27 #include <cpu-features.h> 28 29 static int png_have_neon(png_structp png_ptr)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 } 40