diff options
Diffstat (limited to 'libvpx/vp8/common/extend.c')
| -rw-r--r-- | libvpx/vp8/common/extend.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/libvpx/vp8/common/extend.c b/libvpx/vp8/common/extend.c new file mode 100644 index 0000000..c9bdd21 --- /dev/null +++ b/libvpx/vp8/common/extend.c @@ -0,0 +1,188 @@ +/* + * 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); +} + + +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]; + } +} |