• file
• revisions
• annotate
• diff
• comparison
• raw

media/libvpx/vp8/common/extend.c@ac0c01689b40 (annotated)

media/libvpx/vp8/common/extend.c

Thu, 15 Jan 2015 15:59:08 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Thu, 15 Jan 2015 15:59:08 +0100

branch

TOR_BUG_9701

changeset 10

ac0c01689b40

permissions

-rw-r--r--

Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

michael@0	1	/*
michael@0	2	* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
michael@0	3	*
michael@0	4	* Use of this source code is governed by a BSD-style license
michael@0	5	* that can be found in the LICENSE file in the root of the source
michael@0	6	* tree. An additional intellectual property rights grant can be found
michael@0	7	* in the file PATENTS. All contributing project authors may
michael@0	8	* be found in the AUTHORS file in the root of the source tree.
michael@0	9	*/
michael@0	10
michael@0	11
michael@0	12	#include "extend.h"
michael@0	13	#include "vpx_mem/vpx_mem.h"
michael@0	14
michael@0	15
michael@0	16	static void copy_and_extend_plane
michael@0	17	(
michael@0	18	unsigned char *s, /* source */
michael@0	19	int sp, /* source pitch */
michael@0	20	unsigned char *d, /* destination */
michael@0	21	int dp, /* destination pitch */
michael@0	22	int h, /* height */
michael@0	23	int w, /* width */
michael@0	24	int et, /* extend top border */
michael@0	25	int el, /* extend left border */
michael@0	26	int eb, /* extend bottom border */
michael@0	27	int er /* extend right border */
michael@0	28	)
michael@0	29	{
michael@0	30	int i;
michael@0	31	unsigned char *src_ptr1, *src_ptr2;
michael@0	32	unsigned char *dest_ptr1, *dest_ptr2;
michael@0	33	int linesize;
michael@0	34
michael@0	35	/* copy the left and right most columns out */
michael@0	36	src_ptr1 = s;
michael@0	37	src_ptr2 = s + w - 1;
michael@0	38	dest_ptr1 = d - el;
michael@0	39	dest_ptr2 = d + w;
michael@0	40
michael@0	41	for (i = 0; i < h; i++)
michael@0	42	{
michael@0	43	vpx_memset(dest_ptr1, src_ptr1[0], el);
michael@0	44	vpx_memcpy(dest_ptr1 + el, src_ptr1, w);
michael@0	45	vpx_memset(dest_ptr2, src_ptr2[0], er);
michael@0	46	src_ptr1 += sp;
michael@0	47	src_ptr2 += sp;
michael@0	48	dest_ptr1 += dp;
michael@0	49	dest_ptr2 += dp;
michael@0	50	}
michael@0	51
michael@0	52	/* Now copy the top and bottom lines into each line of the respective
michael@0	53	* borders
michael@0	54	*/
michael@0	55	src_ptr1 = d - el;
michael@0	56	src_ptr2 = d + dp * (h - 1) - el;
michael@0	57	dest_ptr1 = d + dp * (-et) - el;
michael@0	58	dest_ptr2 = d + dp * (h) - el;
michael@0	59	linesize = el + er + w;
michael@0	60
michael@0	61	for (i = 0; i < et; i++)
michael@0	62	{
michael@0	63	vpx_memcpy(dest_ptr1, src_ptr1, linesize);
michael@0	64	dest_ptr1 += dp;
michael@0	65	}
michael@0	66
michael@0	67	for (i = 0; i < eb; i++)
michael@0	68	{
michael@0	69	vpx_memcpy(dest_ptr2, src_ptr2, linesize);
michael@0	70	dest_ptr2 += dp;
michael@0	71	}
michael@0	72	}
michael@0	73
michael@0	74
michael@0	75	void vp8_copy_and_extend_frame(YV12_BUFFER_CONFIG *src,
michael@0	76	YV12_BUFFER_CONFIG *dst)
michael@0	77	{
michael@0	78	int et = dst->border;
michael@0	79	int el = dst->border;
michael@0	80	int eb = dst->border + dst->y_height - src->y_height;
michael@0	81	int er = dst->border + dst->y_width - src->y_width;
michael@0	82
michael@0	83	copy_and_extend_plane(src->y_buffer, src->y_stride,
michael@0	84	dst->y_buffer, dst->y_stride,
michael@0	85	src->y_height, src->y_width,
michael@0	86	et, el, eb, er);
michael@0	87
michael@0	88	et = dst->border >> 1;
michael@0	89	el = dst->border >> 1;
michael@0	90	eb = (dst->border >> 1) + dst->uv_height - src->uv_height;
michael@0	91	er = (dst->border >> 1) + dst->uv_width - src->uv_width;
michael@0	92
michael@0	93	copy_and_extend_plane(src->u_buffer, src->uv_stride,
michael@0	94	dst->u_buffer, dst->uv_stride,
michael@0	95	src->uv_height, src->uv_width,
michael@0	96	et, el, eb, er);
michael@0	97
michael@0	98	copy_and_extend_plane(src->v_buffer, src->uv_stride,
michael@0	99	dst->v_buffer, dst->uv_stride,
michael@0	100	src->uv_height, src->uv_width,
michael@0	101	et, el, eb, er);
michael@0	102	}
michael@0	103
michael@0	104
michael@0	105	void vp8_copy_and_extend_frame_with_rect(YV12_BUFFER_CONFIG *src,
michael@0	106	YV12_BUFFER_CONFIG *dst,
michael@0	107	int srcy, int srcx,
michael@0	108	int srch, int srcw)
michael@0	109	{
michael@0	110	int et = dst->border;
michael@0	111	int el = dst->border;
michael@0	112	int eb = dst->border + dst->y_height - src->y_height;
michael@0	113	int er = dst->border + dst->y_width - src->y_width;
michael@0	114	int src_y_offset = srcy * src->y_stride + srcx;
michael@0	115	int dst_y_offset = srcy * dst->y_stride + srcx;
michael@0	116	int src_uv_offset = ((srcy * src->uv_stride) >> 1) + (srcx >> 1);
michael@0	117	int dst_uv_offset = ((srcy * dst->uv_stride) >> 1) + (srcx >> 1);
michael@0	118
michael@0	119	/* If the side is not touching the bounder then don't extend. */
michael@0	120	if (srcy)
michael@0	121	et = 0;
michael@0	122	if (srcx)
michael@0	123	el = 0;
michael@0	124	if (srcy + srch != src->y_height)
michael@0	125	eb = 0;
michael@0	126	if (srcx + srcw != src->y_width)
michael@0	127	er = 0;
michael@0	128
michael@0	129	copy_and_extend_plane(src->y_buffer + src_y_offset,
michael@0	130	src->y_stride,
michael@0	131	dst->y_buffer + dst_y_offset,
michael@0	132	dst->y_stride,
michael@0	133	srch, srcw,
michael@0	134	et, el, eb, er);
michael@0	135
michael@0	136	et = (et + 1) >> 1;
michael@0	137	el = (el + 1) >> 1;
michael@0	138	eb = (eb + 1) >> 1;
michael@0	139	er = (er + 1) >> 1;
michael@0	140	srch = (srch + 1) >> 1;
michael@0	141	srcw = (srcw + 1) >> 1;
michael@0	142
michael@0	143	copy_and_extend_plane(src->u_buffer + src_uv_offset,
michael@0	144	src->uv_stride,
michael@0	145	dst->u_buffer + dst_uv_offset,
michael@0	146	dst->uv_stride,
michael@0	147	srch, srcw,
michael@0	148	et, el, eb, er);
michael@0	149
michael@0	150	copy_and_extend_plane(src->v_buffer + src_uv_offset,
michael@0	151	src->uv_stride,
michael@0	152	dst->v_buffer + dst_uv_offset,
michael@0	153	dst->uv_stride,
michael@0	154	srch, srcw,
michael@0	155	et, el, eb, er);
michael@0	156	}
michael@0	157
michael@0	158
michael@0	159	/* note the extension is only for the last row, for intra prediction purpose */
michael@0	160	void vp8_extend_mb_row(YV12_BUFFER_CONFIG *ybf,
michael@0	161	unsigned char *YPtr,
michael@0	162	unsigned char *UPtr,
michael@0	163	unsigned char *VPtr)
michael@0	164	{
michael@0	165	int i;
michael@0	166
michael@0	167	YPtr += ybf->y_stride * 14;
michael@0	168	UPtr += ybf->uv_stride * 6;
michael@0	169	VPtr += ybf->uv_stride * 6;
michael@0	170
michael@0	171	for (i = 0; i < 4; i++)
michael@0	172	{
michael@0	173	YPtr[i] = YPtr[-1];
michael@0	174	UPtr[i] = UPtr[-1];
michael@0	175	VPtr[i] = VPtr[-1];
michael@0	176	}
michael@0	177
michael@0	178	YPtr += ybf->y_stride;
michael@0	179	UPtr += ybf->uv_stride;
michael@0	180	VPtr += ybf->uv_stride;
michael@0	181
michael@0	182	for (i = 0; i < 4; i++)
michael@0	183	{
michael@0	184	YPtr[i] = YPtr[-1];
michael@0	185	UPtr[i] = UPtr[-1];
michael@0	186	VPtr[i] = VPtr[-1];
michael@0	187	}
michael@0	188	}