gfx/ycbcr/ycbcr_to_rgb565.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* ***** BEGIN LICENSE BLOCK *****
   3  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   4  *
   5  * The contents of this file are subject to the Mozilla Public License Version
   6  * 1.1 (the "License"); you may not use this file except in compliance with
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  11  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  12  * for the specific language governing rights and limitations under the
  13  * License.
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  15  * The Original Code is mozilla.org code.
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  17  * The Initial Developer of the Original Code is
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  19  * Portions created by the Initial Developer are Copyright (C) 2002
  20  * the Initial Developer. All Rights Reserved.
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  22  * Contributor(s):
  23  *  Tom Brinkman <reportbase@gmail.com>
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  25  * Alternatively, the contents of this file may be used under the terms of
  26  * either the GNU General Public License Version 2 or later (the "GPL"), or
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  28  * in which case the provisions of the GPL or the LGPL are applicable instead
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  37  * ***** END LICENSE BLOCK ***** */
  38
  39 #include "ycbcr_to_rgb565.h"
  40
  41 //The logic for have_ycbcr_to_rgb565 is taken from pixman-cpu.c
  42
  43 #if !defined (HAVE_ARM_NEON)
  44
  45 int have_ycbcr_to_rgb565 ()
  46 {
  47     return 0;
  48 }
  49
  50 #else
  51
  52 #include <stdio.h>
  53 #include <stdlib.h>
  54 #include <string.h>
  55 #include <unistd.h>
  56 #include <sys/types.h>
  57 #include <sys/stat.h>
  58 #include <sys/mman.h>
  59 #include <fcntl.h>
  60 #include <elf.h>
  61
  62 #ifdef ANDROID
  63
  64 int have_ycbcr_to_rgb565 ()
  65 {
  66     static int have_ycbcr_to_rgb565_initialized = 0;
  67     static int arm_has_neon = 0;
  68     if (!have_ycbcr_to_rgb565_initialized)
  69     {
  70         have_ycbcr_to_rgb565_initialized = 1;
  71
  72         char buf[1024];
  73         const char* ver_token = "CPU architecture: ";
  74         FILE* f = fopen("/proc/cpuinfo", "r");
  75         if (!f) {
  76                 return 0;
  77         }
  78
  79         fread(buf, sizeof(char), 1024, f);
  80         arm_has_neon = strstr(buf, "neon") != NULL;
  81         fclose(f);
  82     }
  83     return arm_has_neon;
  84 }
  85
  86 #else
  87
  88 int have_ycbcr_to_rgb565 ()
  89 {
  90     static int have_ycbcr_to_rgb565_initialized = 0;
  91     static int arm_has_neon = 0;
  92     if (!have_ycbcr_to_rgb565_initialized)
  93     {
  94         have_ycbcr_to_rgb565_initialized = 1;
  95         int fd;
  96         Elf32_auxv_t aux;
  97
  98         fd = open ("/proc/self/auxv", O_RDONLY);
  99         if (fd >= 0)
 100         {
 101             while (read (fd, &aux, sizeof(Elf32_auxv_t)) == sizeof(Elf32_auxv_t))
 102             {
 103                 if (aux.a_type == AT_HWCAP)
 104                 {
 105                     uint32_t hwcap = aux.a_un.a_val;
 106                     arm_has_neon = (hwcap & 4096) != 0;
 107                     break;
 108                 }
 109             }
 110             close (fd);
 111          }
 112     }
 113
 114     return arm_has_neon;
 115 }
 116
 117 #endif //ANDROID
 118
 119 #endif //_MSC_VER
 120