vpx_scale/generic/yv12extend.c

/*
 *  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_scale/yv12config.h"
#include "vpx_mem/vpx_mem.h"
#include "vpx_scale/vpx_scale.h"

/****************************************************************************
*  Exports
****************************************************************************/

/****************************************************************************
 *
 ****************************************************************************/
void
vp8_yv12_extend_frame_borders_c(YV12_BUFFER_CONFIG *ybf) {
  int i;
  unsigned char *src_ptr1, *src_ptr2;
  unsigned char *dest_ptr1, *dest_ptr2;

  unsigned int Border;
  int plane_stride;
  int plane_height;
  int plane_width;

  /***********/
  /* Y Plane */
  /***********/
  Border = ybf->border;
  plane_stride = ybf->y_stride;
  plane_height = ybf->y_height;
  plane_width = ybf->y_width;

  /* copy the left and right most columns out */
  src_ptr1 = ybf->y_buffer;
  src_ptr2 = src_ptr1 + plane_width - 1;
  dest_ptr1 = src_ptr1 - Border;
  dest_ptr2 = src_ptr2 + 1;

  for (i = 0; i < plane_height; i++) {
    vpx_memset(dest_ptr1, src_ptr1[0], Border);
    vpx_memset(dest_ptr2, src_ptr2[0], Border);
    src_ptr1  += plane_stride;
    src_ptr2  += plane_stride;
    dest_ptr1 += plane_stride;
    dest_ptr2 += plane_stride;
  }

  /* Now copy the top and bottom source lines into each line of the respective borders */
  src_ptr1 = ybf->y_buffer - Border;
  src_ptr2 = src_ptr1 + (plane_height * plane_stride) - plane_stride;
  dest_ptr1 = src_ptr1 - (Border * plane_stride);
  dest_ptr2 = src_ptr2 + plane_stride;

  for (i = 0; i < (int)Border; i++) {
    vpx_memcpy(dest_ptr1, src_ptr1, plane_stride);
    vpx_memcpy(dest_ptr2, src_ptr2, plane_stride);
    dest_ptr1 += plane_stride;
    dest_ptr2 += plane_stride;
  }


  /***********/
  /* U Plane */
  /***********/
  plane_stride = ybf->uv_stride;
  plane_height = ybf->uv_height;
  plane_width = ybf->uv_width;
  Border /= 2;

  /* copy the left and right most columns out */
  src_ptr1 = ybf->u_buffer;
  src_ptr2 = src_ptr1 + plane_width - 1;
  dest_ptr1 = src_ptr1 - Border;
  dest_ptr2 = src_ptr2 + 1;

  for (i = 0; i < plane_height; i++) {
    vpx_memset(dest_ptr1, src_ptr1[0], Border);
    vpx_memset(dest_ptr2, src_ptr2[0], Border);
    src_ptr1  += plane_stride;
    src_ptr2  += plane_stride;
    dest_ptr1 += plane_stride;
    dest_ptr2 += plane_stride;
  }

  /* Now copy the top and bottom source lines into each line of the respective borders */
  src_ptr1 = ybf->u_buffer - Border;
  src_ptr2 = src_ptr1 + (plane_height * plane_stride) - plane_stride;
  dest_ptr1 = src_ptr1 - (Border * plane_stride);
  dest_ptr2 = src_ptr2 + plane_stride;

  for (i = 0; i < (int)(Border); i++) {
    vpx_memcpy(dest_ptr1, src_ptr1, plane_stride);
    vpx_memcpy(dest_ptr2, src_ptr2, plane_stride);
    dest_ptr1 += plane_stride;
    dest_ptr2 += plane_stride;
  }

  /***********/
  /* V Plane */
  /***********/

  /* copy the left and right most columns out */
  src_ptr1 = ybf->v_buffer;
  src_ptr2 = src_ptr1 + plane_width - 1;
  dest_ptr1 = src_ptr1 - Border;
  dest_ptr2 = src_ptr2 + 1;

  for (i = 0; i < plane_height; i++) {
    vpx_memset(dest_ptr1, src_ptr1[0], Border);
    vpx_memset(dest_ptr2, src_ptr2[0], Border);
    src_ptr1  += plane_stride;
    src_ptr2  += plane_stride;
    dest_ptr1 += plane_stride;
    dest_ptr2 += plane_stride;
  }

  /* Now copy the top and bottom source lines into each line of the respective borders */
  src_ptr1 = ybf->v_buffer - Border;
  src_ptr2 = src_ptr1 + (plane_height * plane_stride) - plane_stride;
  dest_ptr1 = src_ptr1 - (Border * plane_stride);
  dest_ptr2 = src_ptr2 + plane_stride;

  for (i = 0; i < (int)(Border); i++) {
    vpx_memcpy(dest_ptr1, src_ptr1, plane_stride);
    vpx_memcpy(dest_ptr2, src_ptr2, plane_stride);
    dest_ptr1 += plane_stride;
    dest_ptr2 += plane_stride;
  }
}


static void
extend_frame_borders_yonly_c(YV12_BUFFER_CONFIG *ybf) {
  int i;
  unsigned char *src_ptr1, *src_ptr2;
  unsigned char *dest_ptr1, *dest_ptr2;

  unsigned int Border;
  int plane_stride;
  int plane_height;
  int plane_width;

  /***********/
  /* Y Plane */
  /***********/
  Border = ybf->border;
  plane_stride = ybf->y_stride;
  plane_height = ybf->y_height;
  plane_width = ybf->y_width;

  /* copy the left and right most columns out */
  src_ptr1 = ybf->y_buffer;
  src_ptr2 = src_ptr1 + plane_width - 1;
  dest_ptr1 = src_ptr1 - Border;
  dest_ptr2 = src_ptr2 + 1;

  for (i = 0; i < plane_height; i++) {
    vpx_memset(dest_ptr1, src_ptr1[0], Border);
    vpx_memset(dest_ptr2, src_ptr2[0], Border);
    src_ptr1  += plane_stride;
    src_ptr2  += plane_stride;
    dest_ptr1 += plane_stride;
    dest_ptr2 += plane_stride;
  }

  /* Now copy the top and bottom source lines into each line of the respective borders */
  src_ptr1 = ybf->y_buffer - Border;
  src_ptr2 = src_ptr1 + (plane_height * plane_stride) - plane_stride;
  dest_ptr1 = src_ptr1 - (Border * plane_stride);
  dest_ptr2 = src_ptr2 + plane_stride;

  for (i = 0; i < (int)Border; i++) {
    vpx_memcpy(dest_ptr1, src_ptr1, plane_stride);
    vpx_memcpy(dest_ptr2, src_ptr2, plane_stride);
    dest_ptr1 += plane_stride;
    dest_ptr2 += plane_stride;
  }

  plane_stride /= 2;
  plane_height /= 2;
  plane_width /= 2;
  Border /= 2;

}



/****************************************************************************
 *
 *  ROUTINE       : vp8_yv12_copy_frame
 *
 *  INPUTS        :
 *
 *  OUTPUTS       : None.
 *
 *  RETURNS       : void
 *
 *  FUNCTION      : Copies the source image into the destination image and
 *                  updates the destination's UMV borders.
 *
 *  SPECIAL NOTES : The frames are assumed to be identical in size.
 *
 ****************************************************************************/
void
vp8_yv12_copy_frame_c(YV12_BUFFER_CONFIG *src_ybc,
                      YV12_BUFFER_CONFIG *dst_ybc) {
  int row;
  unsigned char *source, *dest;

  source = src_ybc->y_buffer;
  dest = dst_ybc->y_buffer;

  for (row = 0; row < src_ybc->y_height; row++) {
    vpx_memcpy(dest, source, src_ybc->y_width);
    source += src_ybc->y_stride;
    dest   += dst_ybc->y_stride;
  }

  source = src_ybc->u_buffer;
  dest = dst_ybc->u_buffer;

  for (row = 0; row < src_ybc->uv_height; row++) {
    vpx_memcpy(dest, source, src_ybc->uv_width);
    source += src_ybc->uv_stride;
    dest   += dst_ybc->uv_stride;
  }

  source = src_ybc->v_buffer;
  dest = dst_ybc->v_buffer;

  for (row = 0; row < src_ybc->uv_height; row++) {
    vpx_memcpy(dest, source, src_ybc->uv_width);
    source += src_ybc->uv_stride;
    dest   += dst_ybc->uv_stride;
  }

  vp8_yv12_extend_frame_borders_c(dst_ybc);
}

void vp8_yv12_copy_y_c(YV12_BUFFER_CONFIG *src_ybc,
                       YV12_BUFFER_CONFIG *dst_ybc) {
  int row;
  unsigned char *source, *dest;


  source = src_ybc->y_buffer;
  dest = dst_ybc->y_buffer;

  for (row = 0; row < src_ybc->y_height; row++) {
    vpx_memcpy(dest, source, src_ybc->y_width);
    source += src_ybc->y_stride;
    dest   += dst_ybc->y_stride;
  }
}