static void FUNC(intra_pred)(HEVCContext *s, int x0, int y0, int log2_size, int c_idx)

{

#define PU(x) \

    ((x) >> s->sps->log2_min_pu_size)

#define MVF(x, y) \

    (s->ref->tab_mvf[(x) + (y) * pic_width_in_min_pu])

#define MVF_PU(x, y) \

    MVF(PU(x0 + ((x) << hshift)), PU(y0 + ((y) << vshift)))

#define IS_INTRA(x, y) \

    MVF_PU(x, y).is_intra

#define MIN_TB_ADDR_ZS(x, y) \

    s->pps->min_tb_addr_zs[(y) * s->sps->min_tb_width + (x)]

#define EXTEND_LEFT(ptr, start, length) \

        for (i = (start); i > (start) - (length); i--) \

            ptr[i - 1] = ptr[i]

#define EXTEND_RIGHT(ptr, start, length) \

        for (i = (start); i < (start) + (length); i++) \

            ptr[i] = ptr[i - 1]

#define EXTEND_UP(ptr, start, length)   EXTEND_LEFT(ptr, start, length)

#define EXTEND_DOWN(ptr, start, length) EXTEND_RIGHT(ptr, start, length)

#define EXTEND_LEFT_CIP(ptr, start, length) \

        for (i = (start); i > (start) - (length); i--) \

            if (!IS_INTRA(i - 1, -1)) \

                ptr[i - 1] = ptr[i]

#define EXTEND_RIGHT_CIP(ptr, start, length) \

        for (i = (start); i < (start) + (length); i++) \

            if (!IS_INTRA(i, -1)) \

                ptr[i] = ptr[i - 1]

#define EXTEND_UP_CIP(ptr, start, length) \

        for (i = (start); i > (start) - (length); i--) \

            if (!IS_INTRA(-1, i - 1)) \

                ptr[i - 1] = ptr[i]

#define EXTEND_UP_CIP_0(ptr, start, length) \

        for (i = (start); i > (start) - (length); i--) \

            ptr[i - 1] = ptr[i]

#define EXTEND_DOWN_CIP(ptr, start, length) \

        for (i = (start); i < (start) + (length); i++) \

            if (!IS_INTRA(-1, i)) \

                ptr[i] = ptr[i - 1]

    HEVCLocalContext *lc = s->HEVClc;

    int i;

    int hshift = s->sps->hshift[c_idx];

    int vshift = s->sps->vshift[c_idx];

    int size = (1 << log2_size);

    int size_in_luma = size << hshift;

    int size_in_tbs = size_in_luma >> s->sps->log2_min_transform_block_size;

    int x = x0 >> hshift;

    int y = y0 >> vshift;

    int x_tb = x0 >> s->sps->log2_min_transform_block_size;

    int y_tb = y0 >> s->sps->log2_min_transform_block_size;

    int cur_tb_addr = MIN_TB_ADDR_ZS(x_tb, y_tb);



    ptrdiff_t stride = s->frame->linesize[c_idx] / sizeof(pixel);

    pixel *src = (pixel*)s->frame->data[c_idx] + x + y * stride;



    int pic_width_in_min_pu = PU(s->sps->width);



    enum IntraPredMode mode = c_idx ? lc->pu.intra_pred_mode_c :

                              lc->tu.cur_intra_pred_mode;



    pixel left_array[2 * MAX_TB_SIZE + 1];

    pixel filtered_left_array[2 * MAX_TB_SIZE + 1];

    pixel top_array[2 * MAX_TB_SIZE + 1];

    pixel filtered_top_array[2 * MAX_TB_SIZE + 1];



    pixel *left          = left_array + 1;

    pixel *top           = top_array + 1;

    pixel *filtered_left = filtered_left_array + 1;

    pixel *filtered_top  = filtered_top_array + 1;



    int cand_bottom_left = lc->na.cand_bottom_left && cur_tb_addr > MIN_TB_ADDR_ZS(x_tb - 1, y_tb + size_in_tbs);

    int cand_left        = lc->na.cand_left;

    int cand_up_left     = lc->na.cand_up_left;

    int cand_up          = lc->na.cand_up;

    int cand_up_right    = lc->na.cand_up_right && cur_tb_addr > MIN_TB_ADDR_ZS(x_tb + size_in_tbs, y_tb - 1);



    int bottom_left_size = (FFMIN(y0 + 2 * size_in_luma, s->sps->height) -

                            (y0 + size_in_luma)) >> vshift;

    int top_right_size   = (FFMIN(x0 + 2 * size_in_luma, s->sps->width) -

                            (x0 + size_in_luma)) >> hshift;



    if (s->pps->constrained_intra_pred_flag == 1) {

        int size_in_luma_pu = PU(size_in_luma);

        int on_pu_edge_x = !(x0 & ((1 << s->sps->log2_min_pu_size) - 1));

        int on_pu_edge_y = !(y0 & ((1 << s->sps->log2_min_pu_size) - 1));

        if(!size_in_luma_pu)

            size_in_luma_pu++;

        if (cand_bottom_left == 1 && on_pu_edge_x) {

            int x_left_pu   = PU(x0 - 1);

            int y_bottom_pu = PU(y0 + size_in_luma);

            cand_bottom_left = 0;

            for(i = 0; i < size_in_luma_pu; i++)

                cand_bottom_left |= MVF(x_left_pu, y_bottom_pu + i).is_intra;

        }

        if (cand_left == 1 && on_pu_edge_x) {

            int x_left_pu   = PU(x0 - 1);

            int y_left_pu   = PU(y0);

            cand_left = 0;

            for(i = 0; i < size_in_luma_pu; i++)

                cand_left |= MVF(x_left_pu, y_left_pu + i).is_intra;

        }

        if (cand_up_left == 1) {

            int x_left_pu   = PU(x0 - 1);

            int y_top_pu    = PU(y0 - 1);

            cand_up_left = MVF(x_left_pu, y_top_pu).is_intra;

        }

        if (cand_up == 1 && on_pu_edge_y) {

            int x_top_pu    = PU(x0);

            int y_top_pu    = PU(y0 - 1);

            cand_up = 0;

            for(i = 0; i < size_in_luma_pu; i++)

                cand_up |= MVF(x_top_pu + i, y_top_pu).is_intra;

        }

        if (cand_up_right == 1 && on_pu_edge_y) {

            int y_top_pu    = PU(y0 - 1);

            int x_right_pu  = PU(x0 + size_in_luma);

            cand_up_right = 0;

            for(i = 0; i < size_in_luma_pu; i++)

                cand_up_right |= MVF(x_right_pu + i, y_top_pu).is_intra;

        }

        for (i = 0; i < 2 * MAX_TB_SIZE; i++) {

            left[i] = 128;

            top[i]  = 128;

        }

    }

    if (cand_bottom_left) {

        for (i = size + bottom_left_size; i < (size << 1); i++)

            if (IS_INTRA(-1, size + bottom_left_size - 1) || !s->pps->constrained_intra_pred_flag)

                left[i] = POS(-1, size + bottom_left_size - 1);

        for (i = size + bottom_left_size - 1; i >= size; i--)

            if (IS_INTRA(-1, i) || !s->pps->constrained_intra_pred_flag)

                left[i] = POS(-1, i);

    }

    if (cand_left)

        for (i = size - 1; i >= 0; i--)

            if (IS_INTRA(-1, i) || !s->pps->constrained_intra_pred_flag)

                left[i] = POS(-1, i);

    if (cand_up_left)

        if (IS_INTRA(-1, -1) || !s->pps->constrained_intra_pred_flag) {

            left[-1] = POS(-1, -1);

            top[-1]  = left[-1];

        }

    if (cand_up)

        for (i = size - 1; i >= 0; i--)

            if (IS_INTRA(i, -1) || !s->pps->constrained_intra_pred_flag)

                top[i] = POS(i, -1);

    if (cand_up_right) {

        for (i = size + top_right_size; i < (size << 1); i++)

            if (IS_INTRA(size + top_right_size - 1, -1) || !s->pps->constrained_intra_pred_flag)

                top[i] = POS(size + top_right_size - 1, -1);

        for (i = size + top_right_size - 1; i >= size; i--)

            if (IS_INTRA(i, -1) || !s->pps->constrained_intra_pred_flag)

                top[i] = POS(i, -1);

    }



    if (s->pps->constrained_intra_pred_flag == 1) {

        if (cand_bottom_left || cand_left || cand_up_left || cand_up || cand_up_right) {

            int size_max_x = x0 + ((2 * size) << hshift) < s->sps->width ?

                                    2 * size : (s->sps->width - x0) >> hshift;

            int size_max_y = y0 + ((2 * size) << vshift) < s->sps->height ?

                                    2 * size : (s->sps->height - y0) >> vshift;

            int j = size + (cand_bottom_left? bottom_left_size: 0) -1;

            if (!cand_up_right) {

                size_max_x = x0 + ((size) << hshift) < s->sps->width ?

                                                    size : (s->sps->width - x0) >> hshift;

            }

            if (!cand_bottom_left) {

                size_max_y = y0 + (( size) << vshift) < s->sps->height ?

                                                     size : (s->sps->height - y0) >> vshift;

            }

            if (cand_bottom_left || cand_left || cand_up_left) {

                while (j>-1 && !IS_INTRA(-1, j)) j--;

                if (!IS_INTRA(-1, j)) {

                    j = 0;

                    while(j < size_max_x && !IS_INTRA(j, -1)) j++;

                    EXTEND_LEFT_CIP(top, j, j+1);

                    left[-1] = top[-1];

                    j = 0;

                }

            } else {

                j = 0;

                while (j < size_max_x && !IS_INTRA(j, -1)) j++;

                if (j > 0)

                    if (x0 > 0) {

                        EXTEND_LEFT_CIP(top, j, j+1);

                    } else {

                        EXTEND_LEFT_CIP(top, j, j);

                        top[-1] = top[0];

                    }

                left[-1] = top[-1];

                j = 0;

            }

            if (cand_bottom_left || cand_left) {

                EXTEND_DOWN_CIP(left, j, size_max_y-j);

            }

            if (!cand_left) {

                EXTEND_DOWN(left, 0, size);

            }

            if (!cand_bottom_left) {

                EXTEND_DOWN(left, size, size);

            }

            if (x0 != 0 && y0 != 0) {

                EXTEND_UP_CIP(left, size_max_y - 1, size_max_y);

            } else if( x0 == 0) {

                EXTEND_UP_CIP_0(left, size_max_y - 1, size_max_y);

            } else{

                EXTEND_UP_CIP(left, size_max_y - 1, size_max_y-1);

            }

            top[-1] = left[-1];

            if (y0 != 0) {

                EXTEND_RIGHT_CIP(top, 0, size_max_x);

            }

        }

    }

    // Infer the unavailable samples

    if (!cand_bottom_left) {

        if (cand_left) {

            EXTEND_DOWN(left, size, size);

        } else if (cand_up_left) {

            EXTEND_DOWN(left, 0, 2 * size);

            cand_left = 1;

        } else if (cand_up) {

            left[-1] = top[0];

            EXTEND_DOWN(left, 0, 2 * size);

            cand_up_left = 1;

            cand_left = 1;

        } else if (cand_up_right) {

            EXTEND_LEFT(top, size, size);

            left[-1] = top[0];

            EXTEND_DOWN(left ,0 , 2 * size);

            cand_up = 1;

            cand_up_left = 1;

            cand_left = 1;

        } else { // No samples available

            top[0] = left[-1] = (1 << (BIT_DEPTH - 1));

            EXTEND_RIGHT(top, 1, 2 * size - 1);

            EXTEND_DOWN(left, 0, 2 * size);

        }

    }



    if (!cand_left) {

        EXTEND_UP(left, size, size);

    }

    if (!cand_up_left) {

        left[-1] = left[0];

    }

    if (!cand_up) {

        top[0] = left[-1];

        EXTEND_RIGHT(top, 1, size-1);

    }

    if (!cand_up_right) {

        EXTEND_RIGHT(top, size, size);

    }



    top[-1] = left[-1];



#undef EXTEND_LEFT_CIP

#undef EXTEND_RIGHT_CIP

#undef EXTEND_UP_CIP

#undef EXTEND_DOWN_CIP

#undef IS_INTRA

#undef MVF_PU

#undef MVF

#undef PU

#undef EXTEND_LEFT

#undef EXTEND_RIGHT

#undef EXTEND_UP

#undef EXTEND_DOWN

#undef MIN_TB_ADDR_ZS



    // Filtering process

    if (c_idx == 0 && mode != INTRA_DC && size != 4) {

        int intra_hor_ver_dist_thresh[] = { 7, 1, 0 };

        int min_dist_vert_hor           = FFMIN(FFABS((int)mode - 26),

                                                FFABS((int)mode - 10));

        if (min_dist_vert_hor > intra_hor_ver_dist_thresh[log2_size - 3]) {

            int threshold = 1 << (BIT_DEPTH - 5);

            if (s->sps->sps_strong_intra_smoothing_enable_flag &&

                log2_size == 5 &&

                FFABS(top[-1] + top[63] - 2 * top[31]) < threshold &&

                FFABS(left[-1] + left[63] - 2 * left[31]) < threshold) {

                // We can't just overwrite values in top because it could be

                // a pointer into src

                filtered_top[-1] = top[-1];

                filtered_top[63] = top[63];

                for (i = 0; i < 63; i++)

                    filtered_top[i] = ((64 - (i + 1)) * top[-1] +

                                             (i + 1)  * top[63] + 32) >> 6;

                for (i = 0; i < 63; i++)

                    left[i] = ((64 - (i + 1)) * left[-1] +

                                     (i + 1)  * left[63] + 32) >> 6;

                top = filtered_top;

            } else {

                filtered_left[2 * size - 1] = left[2 * size - 1];

                filtered_top[2 * size - 1]  = top[2 * size - 1];

                for (i = 2 * size - 2; i >= 0; i--)

                    filtered_left[i] = (left[i + 1] + 2 * left[i] +

                                        left[i - 1] + 2) >> 2;

                filtered_top[-1] =

                filtered_left[-1] = (left[0] + 2 * left[-1] +

                                     top[0]  + 2) >> 2;

                for (i = 2 * size - 2; i >= 0; i--)

                    filtered_top[i] = (top[i + 1] + 2 * top[i] +

                                       top[i - 1] + 2) >> 2;

                left = filtered_left;

                top  = filtered_top;

            }

        }

    }



    switch (mode) {

    case INTRA_PLANAR:

        s->hpc.pred_planar[log2_size - 2]((uint8_t*)src, (uint8_t*)top,

                                          (uint8_t*)left, stride);

        break;

    case INTRA_DC:

        s->hpc.pred_dc((uint8_t*)src, (uint8_t*)top,

                       (uint8_t*)left, stride, log2_size, c_idx);

        break;

    default:

        s->hpc.pred_angular[log2_size - 2]((uint8_t*)src, (uint8_t*)top,

                                           (uint8_t*)left, stride, c_idx, mode);

        break;

    }

}
