gfx/ycbcr/ycbcr_to_rgb565.cpp
author Andrew Halberstadt <ahalberstadt@mozilla.com>
Sat, 26 Feb 2011 13:19:57 -0500
changeset 63140 aca8013c8cff17c12a7859b6d00855d2b6648f34
parent 60871 10a75a4655f157116372a8eed84c8031edeb0845
child 67675 3b33622916e25577951983861865fb9358afff4d
permissions -rw-r--r--
Bug 631659 - Push Firebug Test Runner to m-c. Patch 2.3. r=ctalbert, a=NPOTB

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 *  Tom Brinkman <reportbase@gmail.com>
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#include "ycbcr_to_rgb565.h"

//The logic for have_ycbcr_to_rgb565 is taken from pixman-cpu.c

#if !defined (HAVE_ARM_NEON)

int have_ycbcr_to_rgb565 ()
{
    return 0;
}

#else

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <elf.h>

#ifdef ANDROID

int have_ycbcr_to_rgb565 ()
{
    static int have_ycbcr_to_rgb565_initialized = 0;
    static int arm_has_neon = 0;
    if (!have_ycbcr_to_rgb565_initialized)
    {
        have_ycbcr_to_rgb565_initialized = 1;

        char buf[1024];
        const char* ver_token = "CPU architecture: ";
        FILE* f = fopen("/proc/cpuinfo", "r");
        if (!f) {
	        return 0;
        }

        fread(buf, sizeof(char), 1024, f);
        arm_has_neon = strstr(buf, "neon") != NULL;
        fclose(f);
    }
    return arm_has_neon;
}

#else

int have_ycbcr_to_rgb565 ()
{
    static int have_ycbcr_to_rgb565_initialized = 0;
    static int arm_has_neon = 0;
    if (!have_ycbcr_to_rgb565_initialized)
    {
        have_ycbcr_to_rgb565_initialized = 1;
        int fd;
        Elf32_auxv_t aux;

        fd = open ("/proc/self/auxv", O_RDONLY);
        if (fd >= 0)
        {
            while (read (fd, &aux, sizeof(Elf32_auxv_t)) == sizeof(Elf32_auxv_t))
            {
                if (aux.a_type == AT_HWCAP)
                {
                    uint32_t hwcap = aux.a_un.a_val;
                    arm_has_neon = (hwcap & 4096) != 0;
                    break;
                }
            }
            close (fd);
         }
    }

    return arm_has_neon;
}

#endif //ANDROID

#endif //_MSC_VER