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/*

 * Copyright (c) 2002-2012 Michael Niedermayer

 * Copyright (C) 2012 Ronald S. Bultje

 *

 * 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 "bit_depth_template.c"

void FUNC(ff_emulated_edge_mc)(uint8_t *buf, ptrdiff_t buf_stride,

                               const uint8_t *src, ptrdiff_t src_stride,

                               int block_w, int block_h,

                               int src_x, int src_y, int w, int h)

{

    int x, y;

    int start_y, start_x, end_y, end_x;

    if (!w || !h)

        return;

    if (src_y >= h) {

        src -= src_y * src_stride;

        src += (h - 1) * src_stride;

        src_y = h - 1;

    } else if (src_y <= -block_h) {

        src -= src_y * src_stride;

        src += (1 - block_h) * src_stride;

        src_y = 1 - block_h;

    }

    if (src_x >= w) {

        src  += (w - 1 - src_x) * sizeof(pixel);

        src_x = w - 1;

    } else if (src_x <= -block_w) {

        src  += (1 - block_w - src_x) * sizeof(pixel);

        src_x = 1 - block_w;

    }

    start_y = FFMAX(0, -src_y);

    start_x = FFMAX(0, -src_x);

    end_y = FFMIN(block_h, h-src_y);

    end_x = FFMIN(block_w, w-src_x);

    av_assert2(start_y < end_y && block_h);

    av_assert2(start_x < end_x && block_w);

    w    = end_x - start_x;

    src += start_y * src_stride + start_x * sizeof(pixel);

    buf += start_x * sizeof(pixel);

    // top

    for (y = 0; y < start_y; y++) {

        memcpy(buf, src, w * sizeof(pixel));

        buf += buf_stride;

    }

    // copy existing part

    for (; y < end_y; y++) {

        memcpy(buf, src, w * sizeof(pixel));

        src += src_stride;

        buf += buf_stride;

    }

    // bottom

    src -= src_stride;

    for (; y < block_h; y++) {

        memcpy(buf, src, w * sizeof(pixel));

        buf += buf_stride;

    }

    buf -= block_h * buf_stride + start_x * sizeof(pixel);

    while (block_h--) {

        pixel *bufp = (pixel *) buf;

        // left

        for(x = 0; x < start_x; x++) {

            bufp[x] = bufp[start_x];

        }

        // right

        for (x = end_x; x < block_w; x++) {

            bufp[x] = bufp[end_x - 1];

        }

        buf += buf_stride;

    }

}