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 /*

  *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.

  *

  *  Use of this source code is governed by a BSD-style license

  *  that can be found in the LICENSE file in the root of the source

  *  tree. An additional intellectual property rights grant can be found

  *  in the file PATENTS.  All contributing project authors may

  *  be found in the AUTHORS file in the root of the source tree.

  */

 #include "vpx_mem/vpx_mem.h"

 #include "vp9/common/vp9_common.h"

 #include "vp9/common/vp9_extend.h"

 static void copy_and_extend_plane(const uint8_t *src, int src_pitch,

                                   uint8_t *dst, int dst_pitch,

                                   int w, int h,

                                   int extend_top, int extend_left,

                                   int extend_bottom, int extend_right) {

   int i, linesize;

   // copy the left and right most columns out

   const uint8_t *src_ptr1 = src;

   const uint8_t *src_ptr2 = src + w - 1;

   uint8_t *dst_ptr1 = dst - extend_left;

   uint8_t *dst_ptr2 = dst + w;

   for (i = 0; i < h; i++) {

     vpx_memset(dst_ptr1, src_ptr1[0], extend_left);

     vpx_memcpy(dst_ptr1 + extend_left, src_ptr1, w);

     vpx_memset(dst_ptr2, src_ptr2[0], extend_right);

     src_ptr1 += src_pitch;

     src_ptr2 += src_pitch;

     dst_ptr1 += dst_pitch;

     dst_ptr2 += dst_pitch;

   }

   // Now copy the top and bottom lines into each line of the respective

   // borders

   src_ptr1 = dst - extend_left;

   src_ptr2 = dst + dst_pitch * (h - 1) - extend_left;

   dst_ptr1 = dst + dst_pitch * (-extend_top) - extend_left;

   dst_ptr2 = dst + dst_pitch * (h) - extend_left;

   linesize = extend_left + extend_right + w;

   for (i = 0; i < extend_top; i++) {

     vpx_memcpy(dst_ptr1, src_ptr1, linesize);

     dst_ptr1 += dst_pitch;

   }

   for (i = 0; i < extend_bottom; i++) {

     vpx_memcpy(dst_ptr2, src_ptr2, linesize);

     dst_ptr2 += dst_pitch;

   }

 }

 void vp9_copy_and_extend_frame(const YV12_BUFFER_CONFIG *src,

                                YV12_BUFFER_CONFIG *dst) {

   // Extend src frame in buffer

   // Altref filtering assumes 16 pixel extension

   const int et_y = 16;

   const int el_y = 16;

   // Motion estimation may use src block variance with the block size up

   // to 64x64, so the right and bottom need to be extended to 64 multiple

   // or up to 16, whichever is greater.

   const int eb_y = MAX(ALIGN_POWER_OF_TWO(src->y_width, 6) - src->y_width,

                        16);

   const int er_y = MAX(ALIGN_POWER_OF_TWO(src->y_height, 6) - src->y_height,

                        16);

   const int uv_width_subsampling = (src->uv_width != src->y_width);

   const int uv_height_subsampling = (src->uv_height != src->y_height);

   const int et_uv = et_y >> uv_height_subsampling;

   const int el_uv = el_y >> uv_width_subsampling;

   const int eb_uv = eb_y >> uv_height_subsampling;

   const int er_uv = er_y >> uv_width_subsampling;

 #if CONFIG_ALPHA

   const int et_a = dst->border >> (dst->alpha_height != dst->y_height);

   const int el_a = dst->border >> (dst->alpha_width != dst->y_width);

   const int eb_a = et_a + dst->alpha_height - src->alpha_height;

   const int er_a = el_a + dst->alpha_width - src->alpha_width;

   copy_and_extend_plane(src->alpha_buffer, src->alpha_stride,

                         dst->alpha_buffer, dst->alpha_stride,

                         src->alpha_width, src->alpha_height,

                         et_a, el_a, eb_a, er_a);

 #endif

   copy_and_extend_plane(src->y_buffer, src->y_stride,

                         dst->y_buffer, dst->y_stride,

                         src->y_width, src->y_height,

                         et_y, el_y, eb_y, er_y);

   copy_and_extend_plane(src->u_buffer, src->uv_stride,

                         dst->u_buffer, dst->uv_stride,

                         src->uv_width, src->uv_height,

                         et_uv, el_uv, eb_uv, er_uv);

   copy_and_extend_plane(src->v_buffer, src->uv_stride,

                         dst->v_buffer, dst->uv_stride,

                         src->uv_width, src->uv_height,

                         et_uv, el_uv, eb_uv, er_uv);

 }

 void vp9_copy_and_extend_frame_with_rect(const YV12_BUFFER_CONFIG *src,

                                          YV12_BUFFER_CONFIG *dst,

                                          int srcy, int srcx,

                                          int srch, int srcw) {

   // If the side is not touching the bounder then don't extend.

   const int et_y = srcy ? 0 : dst->border;

   const int el_y = srcx ? 0 : dst->border;

   const int eb_y = srcy + srch != src->y_height ? 0 :

                       dst->border + dst->y_height - src->y_height;

   const int er_y = srcx + srcw != src->y_width ? 0 :

                       dst->border + dst->y_width - src->y_width;

   const int src_y_offset = srcy * src->y_stride + srcx;

   const int dst_y_offset = srcy * dst->y_stride + srcx;

   const int et_uv = ROUND_POWER_OF_TWO(et_y, 1);

   const int el_uv = ROUND_POWER_OF_TWO(el_y, 1);

   const int eb_uv = ROUND_POWER_OF_TWO(eb_y, 1);

   const int er_uv = ROUND_POWER_OF_TWO(er_y, 1);

   const int src_uv_offset = ((srcy * src->uv_stride) >> 1) + (srcx >> 1);

   const int dst_uv_offset = ((srcy * dst->uv_stride) >> 1) + (srcx >> 1);

   const int srch_uv = ROUND_POWER_OF_TWO(srch, 1);

   const int srcw_uv = ROUND_POWER_OF_TWO(srcw, 1);

   copy_and_extend_plane(src->y_buffer + src_y_offset, src->y_stride,

                         dst->y_buffer + dst_y_offset, dst->y_stride,

                         srcw, srch,

                         et_y, el_y, eb_y, er_y);

   copy_and_extend_plane(src->u_buffer + src_uv_offset, src->uv_stride,

                         dst->u_buffer + dst_uv_offset, dst->uv_stride,

                         srcw_uv, srch_uv,

                         et_uv, el_uv, eb_uv, er_uv);

   copy_and_extend_plane(src->v_buffer + src_uv_offset, src->uv_stride,

                         dst->v_buffer + dst_uv_offset, dst->uv_stride,

                         srcw_uv, srch_uv,

                         et_uv, el_uv, eb_uv, er_uv);

 }