/media/libvpx/vp8/common/extend.c
http://github.com/zpao/v8monkey · C · 131 lines · 96 code · 21 blank · 14 comment · 5 complexity · 7e7d5945601c344967254c9c30fd8e81 MD5 · raw file
- /*
- * 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 i;
- unsigned char *src_ptr1, *src_ptr2;
- unsigned char *dest_ptr1, *dest_ptr2;
- int linesize;
- /* copy the left and right most columns out */
- src_ptr1 = s;
- src_ptr2 = s + w - 1;
- dest_ptr1 = d - el;
- dest_ptr2 = d + w;
- for (i = 0; i < h; i++)
- {
- vpx_memset(dest_ptr1, src_ptr1[0], el);
- vpx_memcpy(dest_ptr1 + el, src_ptr1, w);
- vpx_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++)
- {
- vpx_memcpy(dest_ptr1, src_ptr1, linesize);
- dest_ptr1 += dp;
- }
- for (i = 0; i < eb; i++)
- {
- vpx_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;
- 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);
- 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);
- 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);
- }
- /* 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];
- }
- }