ref: 397aad3ec28020a9b766e362e061701783c9633e
dir: /vp8/common/extend.c/
/* * Copyright (c) 2010 The VP8 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 extend_plane_borders ( unsigned char *s, // source int sp, // 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 = s - el; dest_ptr2 = s + w; for (i = 0; i < h - 0 + 1; i++) { vpx_memset(dest_ptr1, src_ptr1[0], el); vpx_memset(dest_ptr2, src_ptr2[0], er); src_ptr1 += sp; src_ptr2 += sp; dest_ptr1 += sp; dest_ptr2 += sp; } // Now copy the top and bottom source lines into each line of the respective borders src_ptr1 = s - el; src_ptr2 = s + sp * (h - 1) - el; dest_ptr1 = s + sp * (-et) - el; dest_ptr2 = s + sp * (h) - el; linesize = el + er + w + 1; for (i = 0; i < (int)et; i++) { vpx_memcpy(dest_ptr1, src_ptr1, linesize); dest_ptr1 += sp; } for (i = 0; i < (int)eb; i++) { vpx_memcpy(dest_ptr2, src_ptr2, linesize); dest_ptr2 += sp; } } void vp8_extend_to_multiple_of16(YV12_BUFFER_CONFIG *ybf, int width, int height) { int er = 0xf & (16 - (width & 0xf)); int eb = 0xf & (16 - (height & 0xf)); // check for non multiples of 16 if (er != 0 || eb != 0) { extend_plane_borders(ybf->y_buffer, ybf->y_stride, height, width, 0, 0, eb, er); //adjust for uv height = (height + 1) >> 1; width = (width + 1) >> 1; er = 0x7 & (8 - (width & 0x7)); eb = 0x7 & (8 - (height & 0x7)); if (er || eb) { extend_plane_borders(ybf->u_buffer, ybf->uv_stride, height, width, 0, 0, eb, er); extend_plane_borders(ybf->v_buffer, ybf->uv_stride, height, width, 0, 0, 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]; } }