/*
 * ARM-optimized IDCT functions
 * Copyright (c) 2001 Lionel Ulmer
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <stdint.h>

#include "libavutil/attributes.h"
#include "libavutil/cpu.h"
#include "libavutil/arm/cpu.h"
#include "libavcodec/avcodec.h"
#include "libavcodec/idctdsp.h"
#include "idct.h"
#include "idctdsp_arm.h"

/* XXX: local hack */
static void (*ff_put_pixels_clamped)(const int16_t *block, uint8_t *pixels, int line_size);
static void (*ff_add_pixels_clamped)(const int16_t *block, uint8_t *pixels, int line_size);

void ff_add_pixels_clamped_arm(const int16_t *block, uint8_t *dest,
                               int line_size);

/* XXX: those functions should be suppressed ASAP when all IDCTs are
 * converted */
static void j_rev_dct_arm_put(uint8_t *dest, int line_size, int16_t *block)
{
    ff_j_rev_dct_arm(block);
    ff_put_pixels_clamped(block, dest, line_size);
}

static void j_rev_dct_arm_add(uint8_t *dest, int line_size, int16_t *block)
{
    ff_j_rev_dct_arm(block);
    ff_add_pixels_clamped(block, dest, line_size);
}

static void simple_idct_arm_put(uint8_t *dest, int line_size, int16_t *block)
{
    ff_simple_idct_arm(block);
    ff_put_pixels_clamped(block, dest, line_size);
}

static void simple_idct_arm_add(uint8_t *dest, int line_size, int16_t *block)
{
    ff_simple_idct_arm(block);
    ff_add_pixels_clamped(block, dest, line_size);
}

av_cold void ff_idctdsp_init_arm(IDCTDSPContext *c, AVCodecContext *avctx,
                                 unsigned high_bit_depth)
{
    int cpu_flags = av_get_cpu_flags();

    ff_put_pixels_clamped = c->put_pixels_clamped;
    ff_add_pixels_clamped = c->add_pixels_clamped;

    if (!avctx->lowres && !high_bit_depth) {
        if ((avctx->idct_algo == FF_IDCT_AUTO && !(avctx->flags & CODEC_FLAG_BITEXACT)) ||
            avctx->idct_algo == FF_IDCT_ARM) {
            c->idct_put  = j_rev_dct_arm_put;
            c->idct_add  = j_rev_dct_arm_add;
            c->idct      = ff_j_rev_dct_arm;
            c->perm_type = FF_IDCT_PERM_LIBMPEG2;
        } else if (avctx->idct_algo == FF_IDCT_SIMPLEARM) {
            c->idct_put  = simple_idct_arm_put;
            c->idct_add  = simple_idct_arm_add;
            c->idct      = ff_simple_idct_arm;
            c->perm_type = FF_IDCT_PERM_NONE;
        }
    }

    c->add_pixels_clamped = ff_add_pixels_clamped_arm;

    if (have_armv5te(cpu_flags))
        ff_idctdsp_init_armv5te(c, avctx, high_bit_depth);
    if (have_armv6(cpu_flags))
        ff_idctdsp_init_armv6(c, avctx, high_bit_depth);
    if (have_neon(cpu_flags))
        ff_idctdsp_init_neon(c, avctx, high_bit_depth);
}