125 lines
3.2 KiB
C
125 lines
3.2 KiB
C
/*
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* Copyright (c) 2010 The VP8 project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "extend.h"
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#include "vpx_mem/vpx_mem.h"
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static void extend_plane_borders
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(
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unsigned char *s, // source
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int sp, // pitch
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int h, // height
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int w, // width
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int et, // extend top border
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int el, // extend left border
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int eb, // extend bottom border
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int er // extend right border
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)
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{
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int i;
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unsigned char *src_ptr1, *src_ptr2;
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unsigned char *dest_ptr1, *dest_ptr2;
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int linesize;
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// copy the left and right most columns out
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src_ptr1 = s;
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src_ptr2 = s + w - 1;
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dest_ptr1 = s - el;
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dest_ptr2 = s + w;
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for (i = 0; i < h - 0 + 1; i++)
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{
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// Some linkers will complain if we call vpx_memset with el set to a
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// constant 0.
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if (el)
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vpx_memset(dest_ptr1, src_ptr1[0], el);
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vpx_memset(dest_ptr2, src_ptr2[0], er);
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src_ptr1 += sp;
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src_ptr2 += sp;
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dest_ptr1 += sp;
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dest_ptr2 += sp;
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}
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// Now copy the top and bottom source lines into each line of the respective borders
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src_ptr1 = s - el;
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src_ptr2 = s + sp * (h - 1) - el;
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dest_ptr1 = s + sp * (-et) - el;
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dest_ptr2 = s + sp * (h) - el;
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linesize = el + er + w + 1;
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for (i = 0; i < (int)et; i++)
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{
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vpx_memcpy(dest_ptr1, src_ptr1, linesize);
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dest_ptr1 += sp;
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}
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for (i = 0; i < (int)eb; i++)
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{
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vpx_memcpy(dest_ptr2, src_ptr2, linesize);
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dest_ptr2 += sp;
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}
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}
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void vp8_extend_to_multiple_of16(YV12_BUFFER_CONFIG *ybf, int width, int height)
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{
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int er = 0xf & (16 - (width & 0xf));
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int eb = 0xf & (16 - (height & 0xf));
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// check for non multiples of 16
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if (er != 0 || eb != 0)
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{
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extend_plane_borders(ybf->y_buffer, ybf->y_stride, height, width, 0, 0, eb, er);
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//adjust for uv
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height = (height + 1) >> 1;
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width = (width + 1) >> 1;
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er = 0x7 & (8 - (width & 0x7));
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eb = 0x7 & (8 - (height & 0x7));
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if (er || eb)
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{
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extend_plane_borders(ybf->u_buffer, ybf->uv_stride, height, width, 0, 0, eb, er);
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extend_plane_borders(ybf->v_buffer, ybf->uv_stride, height, width, 0, 0, eb, er);
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}
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}
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}
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// note the extension is only for the last row, for intra prediction purpose
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void vp8_extend_mb_row(YV12_BUFFER_CONFIG *ybf, unsigned char *YPtr, unsigned char *UPtr, unsigned char *VPtr)
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{
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int i;
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YPtr += ybf->y_stride * 14;
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UPtr += ybf->uv_stride * 6;
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VPtr += ybf->uv_stride * 6;
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for (i = 0; i < 4; i++)
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{
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YPtr[i] = YPtr[-1];
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UPtr[i] = UPtr[-1];
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VPtr[i] = VPtr[-1];
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}
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YPtr += ybf->y_stride;
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UPtr += ybf->uv_stride;
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VPtr += ybf->uv_stride;
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for (i = 0; i < 4; i++)
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{
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YPtr[i] = YPtr[-1];
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UPtr[i] = UPtr[-1];
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VPtr[i] = VPtr[-1];
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}
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}
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