media/libvpx/vpx_scale/generic/gen_scalers.c@ac0c01689b40
media/libvpx/vpx_scale/generic/gen_scalers.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.
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 */
12 #include "vpx_scale/vpx_scale.h"
13 #include "vpx_mem/vpx_mem.h"
14 /****************************************************************************
15 * Imports
16 ****************************************************************************/
18 /****************************************************************************
19 *
20 *
21 * INPUTS : const unsigned char *source : Pointer to source data.
22 * unsigned int source_width : Stride of source.
23 * unsigned char *dest : Pointer to destination data.
24 * unsigned int dest_width : Stride of destination (NOT USED).
25 *
26 * OUTPUTS : None.
27 *
28 * RETURNS : void
29 *
30 * FUNCTION : Copies horizontal line of pixels from source to
31 * destination scaling up by 4 to 5.
32 *
33 * SPECIAL NOTES : None.
34 *
35 ****************************************************************************/
36 void vp8_horizontal_line_5_4_scale_c(const unsigned char *source,
37 unsigned int source_width,
38 unsigned char *dest,
39 unsigned int dest_width) {
40 unsigned i;
41 unsigned int a, b, c, d, e;
42 unsigned char *des = dest;
43 const unsigned char *src = source;
45 (void) dest_width;
47 for (i = 0; i < source_width; i += 5) {
48 a = src[0];
49 b = src[1];
50 c = src[2];
51 d = src[3];
52 e = src[4];
54 des[0] = (unsigned char) a;
55 des[1] = (unsigned char)((b * 192 + c * 64 + 128) >> 8);
56 des[2] = (unsigned char)((c * 128 + d * 128 + 128) >> 8);
57 des[3] = (unsigned char)((d * 64 + e * 192 + 128) >> 8);
59 src += 5;
60 des += 4;
61 }
62 }
67 void vp8_vertical_band_5_4_scale_c(unsigned char *source,
68 unsigned int src_pitch,
69 unsigned char *dest,
70 unsigned int dest_pitch,
71 unsigned int dest_width) {
72 unsigned int i;
73 unsigned int a, b, c, d, e;
74 unsigned char *des = dest;
75 unsigned char *src = source;
77 for (i = 0; i < dest_width; i++) {
79 a = src[0 * src_pitch];
80 b = src[1 * src_pitch];
81 c = src[2 * src_pitch];
82 d = src[3 * src_pitch];
83 e = src[4 * src_pitch];
85 des[0 * dest_pitch] = (unsigned char) a;
86 des[1 * dest_pitch] = (unsigned char)((b * 192 + c * 64 + 128) >> 8);
87 des[2 * dest_pitch] = (unsigned char)((c * 128 + d * 128 + 128) >> 8);
88 des[3 * dest_pitch] = (unsigned char)((d * 64 + e * 192 + 128) >> 8);
90 src++;
91 des++;
93 }
94 }
97 /*7***************************************************************************
98 *
99 * ROUTINE : vp8_horizontal_line_3_5_scale_c
100 *
101 * INPUTS : const unsigned char *source : Pointer to source data.
102 * unsigned int source_width : Stride of source.
103 * unsigned char *dest : Pointer to destination data.
104 * unsigned int dest_width : Stride of destination (NOT USED).
105 *
106 * OUTPUTS : None.
107 *
108 * RETURNS : void
109 *
110 * FUNCTION : Copies horizontal line of pixels from source to
111 * destination scaling up by 3 to 5.
112 *
113 * SPECIAL NOTES : None.
114 *
115 *
116 ****************************************************************************/
117 void vp8_horizontal_line_5_3_scale_c(const unsigned char *source,
118 unsigned int source_width,
119 unsigned char *dest,
120 unsigned int dest_width) {
121 unsigned int i;
122 unsigned int a, b, c, d, e;
123 unsigned char *des = dest;
124 const unsigned char *src = source;
126 (void) dest_width;
128 for (i = 0; i < source_width; i += 5) {
129 a = src[0];
130 b = src[1];
131 c = src[2];
132 d = src[3];
133 e = src[4];
135 des[0] = (unsigned char) a;
136 des[1] = (unsigned char)((b * 85 + c * 171 + 128) >> 8);
137 des[2] = (unsigned char)((d * 171 + e * 85 + 128) >> 8);
139 src += 5;
140 des += 3;
141 }
143 }
145 void vp8_vertical_band_5_3_scale_c(unsigned char *source,
146 unsigned int src_pitch,
147 unsigned char *dest,
148 unsigned int dest_pitch,
149 unsigned int dest_width) {
150 unsigned int i;
151 unsigned int a, b, c, d, e;
152 unsigned char *des = dest;
153 unsigned char *src = source;
155 for (i = 0; i < dest_width; i++) {
157 a = src[0 * src_pitch];
158 b = src[1 * src_pitch];
159 c = src[2 * src_pitch];
160 d = src[3 * src_pitch];
161 e = src[4 * src_pitch];
163 des[0 * dest_pitch] = (unsigned char) a;
164 des[1 * dest_pitch] = (unsigned char)((b * 85 + c * 171 + 128) >> 8);
165 des[2 * dest_pitch] = (unsigned char)((d * 171 + e * 85 + 128) >> 8);
167 src++;
168 des++;
170 }
171 }
173 /****************************************************************************
174 *
175 * ROUTINE : vp8_horizontal_line_1_2_scale_c
176 *
177 * INPUTS : const unsigned char *source : Pointer to source data.
178 * unsigned int source_width : Stride of source.
179 * unsigned char *dest : Pointer to destination data.
180 * unsigned int dest_width : Stride of destination (NOT USED).
181 *
182 * OUTPUTS : None.
183 *
184 * RETURNS : void
185 *
186 * FUNCTION : Copies horizontal line of pixels from source to
187 * destination scaling up by 1 to 2.
188 *
189 * SPECIAL NOTES : None.
190 *
191 ****************************************************************************/
192 void vp8_horizontal_line_2_1_scale_c(const unsigned char *source,
193 unsigned int source_width,
194 unsigned char *dest,
195 unsigned int dest_width) {
196 unsigned int i;
197 unsigned int a;
198 unsigned char *des = dest;
199 const unsigned char *src = source;
201 (void) dest_width;
203 for (i = 0; i < source_width; i += 2) {
204 a = src[0];
205 des [0] = (unsigned char)(a);
206 src += 2;
207 des += 1;
208 }
209 }
211 void vp8_vertical_band_2_1_scale_c(unsigned char *source,
212 unsigned int src_pitch,
213 unsigned char *dest,
214 unsigned int dest_pitch,
215 unsigned int dest_width) {
216 (void) dest_pitch;
217 (void) src_pitch;
218 vpx_memcpy(dest, source, dest_width);
219 }
221 void vp8_vertical_band_2_1_scale_i_c(unsigned char *source,
222 unsigned int src_pitch,
223 unsigned char *dest,
224 unsigned int dest_pitch,
225 unsigned int dest_width) {
226 int i;
227 int temp;
228 int width = dest_width;
230 (void) dest_pitch;
232 for (i = 0; i < width; i++) {
233 temp = 8;
234 temp += source[i - (int)src_pitch] * 3;
235 temp += source[i] * 10;
236 temp += source[i + src_pitch] * 3;
237 temp >>= 4;
238 dest[i] = (unsigned char)(temp);
239 }
240 }
