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comparison: media/libpng/arm/arm_init.c
media/libpng/arm/arm_init.c
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
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| -1:000000000000 | 0:fa9ab5fefa0c |
|---|---|
| 1 | |
| 2 /* arm_init.c - NEON optimised filter functions | |
| 3 * | |
| 4 * Copyright (c) 2014 Glenn Randers-Pehrson | |
| 5 * Written by Mans Rullgard, 2011. | |
| 6 * Last changed in libpng 1.6.10 [March 6, 2014] | |
| 7 * | |
| 8 * This code is released under the libpng license. | |
| 9 * For conditions of distribution and use, see the disclaimer | |
| 10 * and license in png.h | |
| 11 */ | |
| 12 /* Below, after checking __linux__, various non-C90 POSIX 1003.1 functions are | |
| 13 * called. | |
| 14 */ | |
| 15 #define _POSIX_SOURCE 1 | |
| 16 | |
| 17 #include "../pngpriv.h" | |
| 18 | |
| 19 #ifdef PNG_READ_SUPPORTED | |
| 20 #if PNG_ARM_NEON_OPT > 0 | |
| 21 #ifdef PNG_ARM_NEON_CHECK_SUPPORTED /* Do run-time checks */ | |
| 22 /* WARNING: it is strongly recommended that you do not build libpng with | |
| 23 * run-time checks for CPU features if at all possible. In the case of the ARM | |
| 24 * NEON instructions there is no processor-specific way of detecting the | |
| 25 * presense of the required support, therefore run-time detectioon is extremely | |
| 26 * OS specific. | |
| 27 * | |
| 28 * You may set the macro PNG_ARM_NEON_FILE to the file name of file containing | |
| 29 * a fragment of C source code which defines the png_have_neon function. There | |
| 30 * are a number of implementations in contrib/arm-neon, but the only one that | |
| 31 * has partial support is contrib/arm-neon/linux.c - a generic Linux | |
| 32 * implementation which reads /proc/cpufino. | |
| 33 */ | |
| 34 #ifndef PNG_ARM_NEON_FILE | |
| 35 # ifdef __linux__ | |
| 36 # define PNG_ARM_NEON_FILE "linux.c" | |
| 37 # endif | |
| 38 #endif | |
| 39 | |
| 40 #ifdef PNG_ARM_NEON_FILE | |
| 41 | |
| 42 #include <signal.h> /* for sig_atomic_t */ | |
| 43 static int png_have_neon(png_structp png_ptr); | |
| 44 #include PNG_ARM_NEON_FILE | |
| 45 | |
| 46 #else /* PNG_ARM_NEON_FILE */ | |
| 47 # error "PNG_ARM_NEON_FILE undefined: no support for run-time ARM NEON checks" | |
| 48 #endif /* PNG_ARM_NEON_FILE */ | |
| 49 #endif /* PNG_ARM_NEON_CHECK_SUPPORTED */ | |
| 50 | |
| 51 #ifndef PNG_ALIGNED_MEMORY_SUPPORTED | |
| 52 # error "ALIGNED_MEMORY is required; set: -DPNG_ALIGNED_MEMORY_SUPPORTED" | |
| 53 #endif | |
| 54 | |
| 55 void | |
| 56 png_init_filter_functions_neon(png_structp pp, unsigned int bpp) | |
| 57 { | |
| 58 /* The switch statement is compiled in for ARM_NEON_API, the call to | |
| 59 * png_have_neon is compiled in for ARM_NEON_CHECK. If both are defined | |
| 60 * the check is only performed if the API has not set the NEON option on | |
| 61 * or off explicitly. In this case the check controls what happens. | |
| 62 * | |
| 63 * If the CHECK is not compiled in and the option is UNSET the behavior prior | |
| 64 * to 1.6.7 was to use the NEON code - this was a bug caused by having the | |
| 65 * wrong order of the 'ON' and 'default' cases. UNSET now defaults to OFF, | |
| 66 * as documented in png.h | |
| 67 */ | |
| 68 #ifdef PNG_ARM_NEON_API_SUPPORTED | |
| 69 switch ((pp->options >> PNG_ARM_NEON) & 3) | |
| 70 { | |
| 71 case PNG_OPTION_UNSET: | |
| 72 /* Allow the run-time check to execute if it has been enabled - | |
| 73 * thus both API and CHECK can be turned on. If it isn't supported | |
| 74 * this case will fall through to the 'default' below, which just | |
| 75 * returns. | |
| 76 */ | |
| 77 #endif /* PNG_ARM_NEON_API_SUPPORTED */ | |
| 78 #ifdef PNG_ARM_NEON_CHECK_SUPPORTED | |
| 79 { | |
| 80 static volatile sig_atomic_t no_neon = -1; /* not checked */ | |
| 81 | |
| 82 if (no_neon < 0) | |
| 83 no_neon = !png_have_neon(pp); | |
| 84 | |
| 85 if (no_neon) | |
| 86 return; | |
| 87 } | |
| 88 #ifdef PNG_ARM_NEON_API_SUPPORTED | |
| 89 break; | |
| 90 #endif | |
| 91 #endif /* PNG_ARM_NEON_CHECK_SUPPORTED */ | |
| 92 | |
| 93 #ifdef PNG_ARM_NEON_API_SUPPORTED | |
| 94 default: /* OFF or INVALID */ | |
| 95 return; | |
| 96 | |
| 97 case PNG_OPTION_ON: | |
| 98 /* Option turned on */ | |
| 99 break; | |
| 100 } | |
| 101 #endif | |
| 102 | |
| 103 /* IMPORTANT: any new external functions used here must be declared using | |
| 104 * PNG_INTERNAL_FUNCTION in ../pngpriv.h. This is required so that the | |
| 105 * 'prefix' option to configure works: | |
| 106 * | |
| 107 * ./configure --with-libpng-prefix=foobar_ | |
| 108 * | |
| 109 * Verify you have got this right by running the above command, doing a build | |
| 110 * and examining pngprefix.h; it must contain a #define for every external | |
| 111 * function you add. (Notice that this happens automatically for the | |
| 112 * initialization function.) | |
| 113 */ | |
| 114 pp->read_filter[PNG_FILTER_VALUE_UP-1] = png_read_filter_row_up_neon; | |
| 115 | |
| 116 if (bpp == 3) | |
| 117 { | |
| 118 pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub3_neon; | |
| 119 pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg3_neon; | |
| 120 pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = | |
| 121 png_read_filter_row_paeth3_neon; | |
| 122 } | |
| 123 | |
| 124 else if (bpp == 4) | |
| 125 { | |
| 126 pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub4_neon; | |
| 127 pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg4_neon; | |
| 128 pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = | |
| 129 png_read_filter_row_paeth4_neon; | |
| 130 } | |
| 131 } | |
| 132 #endif /* PNG_ARM_NEON_OPT > 0 */ | |
| 133 #endif /* PNG_READ_SUPPORTED */ |
