/* *  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 "extend.h"#include "vpx_mem/vpx_mem.h" static void copy_and_extend_plane(    unsigned char *s,      /* source */    int sp,                /* source pitch */    unsigned char *d,      /* destination */    int dp,                /* destination pitch */    int h,                 /* height */    int w,                 /* width */    int et,                /* extend top border */    int el,                /* extend left border */    int eb,                /* extend bottom border */    int er,                /* extend right border */    int interleave_step) { /* step between pixels of the current plane */  int i, j;  unsigned char *src_ptr1, *src_ptr2;  unsigned char *dest_ptr1, *dest_ptr2;  int linesize;   if (interleave_step < 1) interleave_step = 1;   /* copy the left and right most columns out */  src_ptr1 = s;  src_ptr2 = s + (w - 1) * interleave_step;  dest_ptr1 = d - el;  dest_ptr2 = d + w;   for (i = 0; i < h; ++i) {    memset(dest_ptr1, src_ptr1[0], el);    if (interleave_step == 1) {      memcpy(dest_ptr1 + el, src_ptr1, w);    } else {      for (j = 0; j < w; j++) {        dest_ptr1[el + j] = src_ptr1[interleave_step * j];      }    }    memset(dest_ptr2, src_ptr2[0], er);    src_ptr1 += sp;    src_ptr2 += sp;    dest_ptr1 += dp;    dest_ptr2 += dp;  }   /* Now copy the top and bottom lines into each line of the respective   * borders   */  src_ptr1 = d - el;  src_ptr2 = d + dp * (h - 1) - el;  dest_ptr1 = d + dp * (-et) - el;  dest_ptr2 = d + dp * (h)-el;  linesize = el + er + w;   for (i = 0; i < et; ++i) {    memcpy(dest_ptr1, src_ptr1, linesize);    dest_ptr1 += dp;  }   for (i = 0; i < eb; ++i) {    memcpy(dest_ptr2, src_ptr2, linesize);    dest_ptr2 += dp;  }} void vp8_copy_and_extend_frame(YV12_BUFFER_CONFIG *src,                               YV12_BUFFER_CONFIG *dst) {  int et = dst->border;  int el = dst->border;  int eb = dst->border + dst->y_height - src->y_height;  int er = dst->border + dst->y_width - src->y_width;   // detect nv12 colorspace  int chroma_step = src->v_buffer - src->u_buffer == 1 ? 2 : 1;   copy_and_extend_plane(src->y_buffer, src->y_stride, dst->y_buffer,                        dst->y_stride, src->y_height, src->y_width, et, el, eb,                        er, 1);   et = dst->border >> 1;  el = dst->border >> 1;  eb = (dst->border >> 1) + dst->uv_height - src->uv_height;  er = (dst->border >> 1) + dst->uv_width - src->uv_width;   copy_and_extend_plane(src->u_buffer, src->uv_stride, dst->u_buffer,                        dst->uv_stride, src->uv_height, src->uv_width, et, el,                        eb, er, chroma_step);   copy_and_extend_plane(src->v_buffer, src->uv_stride, dst->v_buffer,                        dst->uv_stride, src->uv_height, src->uv_width, et, el,                        eb, er, chroma_step);} void vp8_copy_and_extend_frame_with_rect(YV12_BUFFER_CONFIG *src,                                         YV12_BUFFER_CONFIG *dst, int srcy,                                         int srcx, int srch, int srcw) {  int et = dst->border;  int el = dst->border;  int eb = dst->border + dst->y_height - src->y_height;  int er = dst->border + dst->y_width - src->y_width;  int src_y_offset = srcy * src->y_stride + srcx;  int dst_y_offset = srcy * dst->y_stride + srcx;  int src_uv_offset = ((srcy * src->uv_stride) >> 1) + (srcx >> 1);  int dst_uv_offset = ((srcy * dst->uv_stride) >> 1) + (srcx >> 1);  // detect nv12 colorspace  int chroma_step = src->v_buffer - src->u_buffer == 1 ? 2 : 1;   /* If the side is not touching the bounder then don't extend. */  if (srcy) et = 0;  if (srcx) el = 0;  if (srcy + srch != src->y_height) eb = 0;  if (srcx + srcw != src->y_width) er = 0;   copy_and_extend_plane(src->y_buffer + src_y_offset, src->y_stride,                        dst->y_buffer + dst_y_offset, dst->y_stride, srch, srcw,                        et, el, eb, er, 1);   et = (et + 1) >> 1;  el = (el + 1) >> 1;  eb = (eb + 1) >> 1;  er = (er + 1) >> 1;  srch = (srch + 1) >> 1;  srcw = (srcw + 1) >> 1;   copy_and_extend_plane(src->u_buffer + src_uv_offset, src->uv_stride,                        dst->u_buffer + dst_uv_offset, dst->uv_stride, srch,                        srcw, et, el, eb, er, chroma_step);   copy_and_extend_plane(src->v_buffer + src_uv_offset, src->uv_stride,                        dst->v_buffer + dst_uv_offset, dst->uv_stride, srch,                        srcw, et, el, eb, er, chroma_step);} /* note the extension is only for the last row, for intra prediction purpose */void vp8_extend_mb_row(YV12_BUFFER_CONFIG *ybf, unsigned char *YPtr,                       unsigned char *UPtr, unsigned char *VPtr) {  int i;   YPtr += ybf->y_stride * 14;  UPtr += ybf->uv_stride * 6;  VPtr += ybf->uv_stride * 6;   for (i = 0; i < 4; ++i) {    YPtr[i] = YPtr[-1];    UPtr[i] = UPtr[-1];    VPtr[i] = VPtr[-1];  }   YPtr += ybf->y_stride;  UPtr += ybf->uv_stride;  VPtr += ybf->uv_stride;   for (i = 0; i < 4; ++i) {    YPtr[i] = YPtr[-1];    UPtr[i] = UPtr[-1];    VPtr[i] = VPtr[-1];  }}