1 /*
2  *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
3  *
4  *  Use of this source code is governed by a BSD-style license
5  *  that can be found in the LICENSE file in the root of the source
6  *  tree. An additional intellectual property rights grant can be found
7  *  in the file PATENTS.  All contributing project authors may
8  *  be found in the AUTHORS file in the root of the source tree.
9  */
10 
11 #include "vp8/common/loopfilter.h"
12 #include "vpx_scale/yv12config.h"
13 
14 extern void vp8_memcpy_partial_neon(unsigned char *dst_ptr,
15                                     unsigned char *src_ptr,
16                                     int sz);
17 
18 
vp8_yv12_copy_partial_frame_neon(YV12_BUFFER_CONFIG * src_ybc,YV12_BUFFER_CONFIG * dst_ybc)19 void vp8_yv12_copy_partial_frame_neon(YV12_BUFFER_CONFIG *src_ybc,
20                                       YV12_BUFFER_CONFIG *dst_ybc)
21 {
22     unsigned char *src_y, *dst_y;
23     int yheight;
24     int ystride;
25     int yoffset;
26     int linestocopy;
27 
28     yheight  = src_ybc->y_height;
29     ystride  = src_ybc->y_stride;
30 
31     /* number of MB rows to use in partial filtering */
32     linestocopy = (yheight >> 4) / PARTIAL_FRAME_FRACTION;
33     linestocopy = linestocopy ? linestocopy << 4 : 16;     /* 16 lines per MB */
34 
35     /* Copy extra 4 so that full filter context is available if filtering done
36      * on the copied partial frame and not original. Partial filter does mb
37      * filtering for top row also, which can modify3 pixels above.
38      */
39     linestocopy += 4;
40     /* partial image starts at ~middle of frame (macroblock border) */
41     yoffset  = ystride * (((yheight >> 5) * 16) - 4);
42     src_y = src_ybc->y_buffer + yoffset;
43     dst_y = dst_ybc->y_buffer + yoffset;
44 
45     vp8_memcpy_partial_neon(dst_y, src_y, ystride * linestocopy);
46 }
47