/*
 * Bayer-to-RGB/YV12 template
 * Copyright (c) 2011-2014 Peter Ross <pross@xvid.org>
 *
 * 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
 */

#if defined(BAYER_BGGR) || defined(BAYER_GBRG)
#define BAYER_R       0
#define BAYER_G       1
#define BAYER_B       2
#endif
#if defined(BAYER_RGGB) || defined(BAYER_GRBG)
#define BAYER_R       2
#define BAYER_G       1
#define BAYER_B       0
#endif

#if defined(BAYER_8)
#define BAYER_READ(x) (x)
#define BAYER_SIZEOF  1
#define BAYER_SHIFT   0
#endif
#if defined(BAYER_16LE)
#define BAYER_READ(x) AV_RL16(&x)
#define BAYER_SIZEOF  2
#define BAYER_SHIFT   8
#endif
#if defined(BAYER_16BE)
#define BAYER_READ(x) AV_RB16(&x)
#define BAYER_SIZEOF  2
#define BAYER_SHIFT   8
#endif

#define S(y, x) BAYER_READ(src[(y)*src_stride + BAYER_SIZEOF*(x)])
#define T(y, x) (unsigned int)S(y, x)
#define R(y, x) dst[(y)*dst_stride + (x)*3 + BAYER_R]
#define G(y, x) dst[(y)*dst_stride + (x)*3 + BAYER_G]
#define B(y, x) dst[(y)*dst_stride + (x)*3 + BAYER_B]

#if defined(BAYER_BGGR) || defined(BAYER_RGGB)
#define BAYER_TO_RGB24_COPY \
    R(0, 0) = \
    R(0, 1) = \
    R(1, 1) = \
    R(1, 0) = S(1, 1) >> BAYER_SHIFT; \
    \
    G(0, 1) = S(0, 1) >> BAYER_SHIFT; \
    G(0, 0) = \
    G(1, 1) = (T(0, 1) + T(1, 0)) >> (1 + BAYER_SHIFT); \
    G(1, 0) = S(1, 0) >> BAYER_SHIFT; \
    \
    B(1, 1) = \
    B(0, 0) = \
    B(0, 1) = \
    B(1, 0) = S(0, 0) >> BAYER_SHIFT;
#define BAYER_TO_RGB24_INTERPOLATE \
    R(0, 0) = (T(-1, -1) + T(-1,  1) + T(1, -1) + T(1, 1)) >> (2 + BAYER_SHIFT); \
    G(0, 0) = (T(-1,  0) + T( 0, -1) + T(0,  1) + T(1, 0)) >> (2 + BAYER_SHIFT); \
    B(0, 0) =  S(0, 0) >> BAYER_SHIFT; \
    \
    R(0, 1) = (T(-1, 1) + T(1, 1)) >> (1 + BAYER_SHIFT); \
    G(0, 1) =  S(0,  1) >> BAYER_SHIFT; \
    B(0, 1) = (T(0,  0) + T(0, 2)) >> (1 + BAYER_SHIFT); \
    \
    R(1, 0) = (T(1, -1) + T(1, 1)) >> (1 + BAYER_SHIFT); \
    G(1, 0) =  S(1,  0) >> BAYER_SHIFT; \
    B(1, 0) = (T(0,  0) + T(2, 0)) >> (1 + BAYER_SHIFT); \
    \
    R(1, 1) =  S(1, 1) >> BAYER_SHIFT; \
    G(1, 1) = (T(0, 1) + T(1, 0) + T(1, 2) + T(2, 1)) >> (2 + BAYER_SHIFT); \
    B(1, 1) = (T(0, 0) + T(0, 2) + T(2, 0) + T(2, 2)) >> (2 + BAYER_SHIFT);
#else
#define BAYER_TO_RGB24_COPY \
    R(0, 0) = \
    R(0, 1) = \
    R(1, 1) = \
    R(1, 0) = S(1, 0) >> BAYER_SHIFT; \
    \
    G(0, 0) = S(0, 0) >> BAYER_SHIFT; \
    G(1, 1) = S(1, 1) >> BAYER_SHIFT; \
    G(0, 1) = \
    G(1, 0) = (T(0, 0) + T(1, 1)) >> (1 + BAYER_SHIFT); \
    \
    B(1, 1) = \
    B(0, 0) = \
    B(0, 1) = \
    B(1, 0) = S(0, 1) >> BAYER_SHIFT;
#define BAYER_TO_RGB24_INTERPOLATE \
    R(0, 0) = (T(-1, 0) + T(1, 0)) >> (1 + BAYER_SHIFT); \
    G(0, 0) =  S(0, 0) >> BAYER_SHIFT; \
    B(0, 0) = (T(0, -1) + T(0, 1)) >> (1 + BAYER_SHIFT); \
    \
    R(0, 1) = (T(-1, 0) + T(-1, 2) + T(1, 0) + T(1, 2)) >> (2 + BAYER_SHIFT); \
    G(0, 1) = (T(-1, 1) + T(0,  0) + T(0, 2) + T(1, 1)) >> (2 + BAYER_SHIFT); \
    B(0, 1) =  S(0, 1) >> BAYER_SHIFT; \
    \
    R(1, 0) =  S(1, 0) >> BAYER_SHIFT; \
    G(1, 0) = (T(0, 0)  + T(1, -1) + T(1,  1) + T(2, 0)) >> (2 + BAYER_SHIFT); \
    B(1, 0) = (T(0, -1) + T(0,  1) + T(2, -1) + T(2, 1)) >> (2 + BAYER_SHIFT); \
    \
    R(1, 1) = (T(1, 0) + T(1, 2)) >> (1 + BAYER_SHIFT); \
    G(1, 1) =  S(1, 1) >> BAYER_SHIFT; \
    B(1, 1) = (T(0, 1) + T(2, 1)) >> (1 + BAYER_SHIFT);
#endif

/**
 * invoke ff_rgb24toyv12 for 2x2 pixels
 */
#define rgb24toyv12_2x2(src, dstY, dstU, dstV, luma_stride, src_stride, rgb2yuv) \
    ff_rgb24toyv12(src, dstY, dstV, dstU, 2, 2, luma_stride, 0, src_stride, rgb2yuv)

static void BAYER_RENAME(rgb24_copy)(const uint8_t *src, int src_stride, uint8_t *dst, int dst_stride, int width)
{
    int i;
    for (i = 0 ; i < width; i+= 2) {
        BAYER_TO_RGB24_COPY
        src += 2 * BAYER_SIZEOF;
        dst += 6;
    }
}

static void BAYER_RENAME(rgb24_interpolate)(const uint8_t *src, int src_stride, uint8_t *dst, int dst_stride, int width)
{
    int i;

    BAYER_TO_RGB24_COPY
    src += 2 * BAYER_SIZEOF;
    dst += 6;

    for (i = 2 ; i < width - 2; i+= 2) {
        BAYER_TO_RGB24_INTERPOLATE
        src += 2 * BAYER_SIZEOF;
        dst += 6;
    }

    if (width > 2) {
        BAYER_TO_RGB24_COPY
    }
}

static void BAYER_RENAME(yv12_copy)(const uint8_t *src, int src_stride, uint8_t *dstY, uint8_t *dstU, uint8_t *dstV, int luma_stride, int width, int32_t *rgb2yuv)
{
    uint8_t dst[12];
    const int dst_stride = 6;
    int i;
    for (i = 0 ; i < width; i+= 2) {
        BAYER_TO_RGB24_COPY
        rgb24toyv12_2x2(dst, dstY, dstU, dstV, luma_stride, dst_stride, rgb2yuv);
        src  += 2 * BAYER_SIZEOF;
        dstY += 2;
        dstU++;
        dstV++;
    }
}

static void BAYER_RENAME(yv12_interpolate)(const uint8_t *src, int src_stride, uint8_t *dstY, uint8_t *dstU, uint8_t *dstV, int luma_stride, int width, int32_t *rgb2yuv)
{
    uint8_t dst[12];
    const int dst_stride = 6;
    int i;

    BAYER_TO_RGB24_COPY
    rgb24toyv12_2x2(dst, dstY, dstU, dstV, luma_stride, dst_stride, rgb2yuv);
    src  += 2 * BAYER_SIZEOF;
    dstY += 2;
    dstU++;
    dstV++;

    for (i = 2 ; i < width - 2; i+= 2) {
        BAYER_TO_RGB24_INTERPOLATE
        rgb24toyv12_2x2(dst, dstY, dstU, dstV, luma_stride, dst_stride, rgb2yuv);
        src  += 2 * BAYER_SIZEOF;
        dstY += 2;
        dstU++;
        dstV++;
    }

    if (width > 2) {
        BAYER_TO_RGB24_COPY
        rgb24toyv12_2x2(dst, dstY, dstU, dstV, luma_stride, dst_stride, rgb2yuv);
    }
}

#undef S
#undef T
#undef R
#undef G
#undef B
#undef BAYER_TO_RGB24_COPY
#undef BAYER_TO_RGB24_INTERPOLATE

#undef BAYER_RENAME

#undef BAYER_R
#undef BAYER_G
#undef BAYER_B
#undef BAYER_READ
#undef BAYER_SIZEOF
#undef BAYER_SHIFT

#if defined(BAYER_BGGR)
#undef BAYER_BGGR
#endif
#if defined(BAYER_RGGB)
#undef BAYER_RGGB
#endif
#if defined(BAYER_GBRG)
#undef BAYER_GBRG
#endif
#if defined(BAYER_GRBG)
#undef BAYER_GRBG
#endif
#if defined(BAYER_8)
#undef BAYER_8
#endif
#if defined(BAYER_16LE)
#undef BAYER_16LE
#endif
#if defined(BAYER_16BE)
#undef BAYER_16BE
#endif