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/*
* 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 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++)
{
// Some linkers will complain if we call vpx_memset with el set to a
// constant 0.
if (el)
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];
}
}
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