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