ref: fee146e60b1143a2434ff3695083155618240645
dir: /vp8/common/extend.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 "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++) { memset(dest_ptr1, src_ptr1[0], el); memcpy(dest_ptr1 + el, src_ptr1, w); 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; 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); } 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); /* 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); 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); 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); } /* 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]; } }