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media/libvpx/vpx_scale/generic/gen_scalers.c@b8a032363ba2 (annotated)

media/libvpx/vpx_scale/generic/gen_scalers.c

Thu, 22 Jan 2015 13:21:57 +0100

author
Michael Schloh von Bennewitz <michael@schloh.com>
date
Thu, 22 Jan 2015 13:21:57 +0100
branch
TOR_BUG_9701
changeset 15
b8a032363ba2
permissions
-rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

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 "vpx_scale/vpx_scale.h"
michael@0 13 #include "vpx_mem/vpx_mem.h"
michael@0 14 /****************************************************************************
michael@0 15 * Imports
michael@0 16 ****************************************************************************/
michael@0 17
michael@0 18 /****************************************************************************
michael@0 19 *
michael@0 20 *
michael@0 21 * INPUTS : const unsigned char *source : Pointer to source data.
michael@0 22 * unsigned int source_width : Stride of source.
michael@0 23 * unsigned char *dest : Pointer to destination data.
michael@0 24 * unsigned int dest_width : Stride of destination (NOT USED).
michael@0 25 *
michael@0 26 * OUTPUTS : None.
michael@0 27 *
michael@0 28 * RETURNS : void
michael@0 29 *
michael@0 30 * FUNCTION : Copies horizontal line of pixels from source to
michael@0 31 * destination scaling up by 4 to 5.
michael@0 32 *
michael@0 33 * SPECIAL NOTES : None.
michael@0 34 *
michael@0 35 ****************************************************************************/
michael@0 36 void vp8_horizontal_line_5_4_scale_c(const unsigned char *source,
michael@0 37 unsigned int source_width,
michael@0 38 unsigned char *dest,
michael@0 39 unsigned int dest_width) {
michael@0 40 unsigned i;
michael@0 41 unsigned int a, b, c, d, e;
michael@0 42 unsigned char *des = dest;
michael@0 43 const unsigned char *src = source;
michael@0 44
michael@0 45 (void) dest_width;
michael@0 46
michael@0 47 for (i = 0; i < source_width; i += 5) {
michael@0 48 a = src[0];
michael@0 49 b = src[1];
michael@0 50 c = src[2];
michael@0 51 d = src[3];
michael@0 52 e = src[4];
michael@0 53
michael@0 54 des[0] = (unsigned char) a;
michael@0 55 des[1] = (unsigned char)((b * 192 + c * 64 + 128) >> 8);
michael@0 56 des[2] = (unsigned char)((c * 128 + d * 128 + 128) >> 8);
michael@0 57 des[3] = (unsigned char)((d * 64 + e * 192 + 128) >> 8);
michael@0 58
michael@0 59 src += 5;
michael@0 60 des += 4;
michael@0 61 }
michael@0 62 }
michael@0 63
michael@0 64
michael@0 65
michael@0 66
michael@0 67 void vp8_vertical_band_5_4_scale_c(unsigned char *source,
michael@0 68 unsigned int src_pitch,
michael@0 69 unsigned char *dest,
michael@0 70 unsigned int dest_pitch,
michael@0 71 unsigned int dest_width) {
michael@0 72 unsigned int i;
michael@0 73 unsigned int a, b, c, d, e;
michael@0 74 unsigned char *des = dest;
michael@0 75 unsigned char *src = source;
michael@0 76
michael@0 77 for (i = 0; i < dest_width; i++) {
michael@0 78
michael@0 79 a = src[0 * src_pitch];
michael@0 80 b = src[1 * src_pitch];
michael@0 81 c = src[2 * src_pitch];
michael@0 82 d = src[3 * src_pitch];
michael@0 83 e = src[4 * src_pitch];
michael@0 84
michael@0 85 des[0 * dest_pitch] = (unsigned char) a;
michael@0 86 des[1 * dest_pitch] = (unsigned char)((b * 192 + c * 64 + 128) >> 8);
michael@0 87 des[2 * dest_pitch] = (unsigned char)((c * 128 + d * 128 + 128) >> 8);
michael@0 88 des[3 * dest_pitch] = (unsigned char)((d * 64 + e * 192 + 128) >> 8);
michael@0 89
michael@0 90 src++;
michael@0 91 des++;
michael@0 92
michael@0 93 }
michael@0 94 }
michael@0 95
michael@0 96
michael@0 97 /*7***************************************************************************
michael@0 98 *
michael@0 99 * ROUTINE : vp8_horizontal_line_3_5_scale_c
michael@0 100 *
michael@0 101 * INPUTS : const unsigned char *source : Pointer to source data.
michael@0 102 * unsigned int source_width : Stride of source.
michael@0 103 * unsigned char *dest : Pointer to destination data.
michael@0 104 * unsigned int dest_width : Stride of destination (NOT USED).
michael@0 105 *
michael@0 106 * OUTPUTS : None.
michael@0 107 *
michael@0 108 * RETURNS : void
michael@0 109 *
michael@0 110 * FUNCTION : Copies horizontal line of pixels from source to
michael@0 111 * destination scaling up by 3 to 5.
michael@0 112 *
michael@0 113 * SPECIAL NOTES : None.
michael@0 114 *
michael@0 115 *
michael@0 116 ****************************************************************************/
michael@0 117 void vp8_horizontal_line_5_3_scale_c(const unsigned char *source,
michael@0 118 unsigned int source_width,
michael@0 119 unsigned char *dest,
michael@0 120 unsigned int dest_width) {
michael@0 121 unsigned int i;
michael@0 122 unsigned int a, b, c, d, e;
michael@0 123 unsigned char *des = dest;
michael@0 124 const unsigned char *src = source;
michael@0 125
michael@0 126 (void) dest_width;
michael@0 127
michael@0 128 for (i = 0; i < source_width; i += 5) {
michael@0 129 a = src[0];
michael@0 130 b = src[1];
michael@0 131 c = src[2];
michael@0 132 d = src[3];
michael@0 133 e = src[4];
michael@0 134
michael@0 135 des[0] = (unsigned char) a;
michael@0 136 des[1] = (unsigned char)((b * 85 + c * 171 + 128) >> 8);
michael@0 137 des[2] = (unsigned char)((d * 171 + e * 85 + 128) >> 8);
michael@0 138
michael@0 139 src += 5;
michael@0 140 des += 3;
michael@0 141 }
michael@0 142
michael@0 143 }
michael@0 144
michael@0 145 void vp8_vertical_band_5_3_scale_c(unsigned char *source,
michael@0 146 unsigned int src_pitch,
michael@0 147 unsigned char *dest,
michael@0 148 unsigned int dest_pitch,
michael@0 149 unsigned int dest_width) {
michael@0 150 unsigned int i;
michael@0 151 unsigned int a, b, c, d, e;
michael@0 152 unsigned char *des = dest;
michael@0 153 unsigned char *src = source;
michael@0 154
michael@0 155 for (i = 0; i < dest_width; i++) {
michael@0 156
michael@0 157 a = src[0 * src_pitch];
michael@0 158 b = src[1 * src_pitch];
michael@0 159 c = src[2 * src_pitch];
michael@0 160 d = src[3 * src_pitch];
michael@0 161 e = src[4 * src_pitch];
michael@0 162
michael@0 163 des[0 * dest_pitch] = (unsigned char) a;
michael@0 164 des[1 * dest_pitch] = (unsigned char)((b * 85 + c * 171 + 128) >> 8);
michael@0 165 des[2 * dest_pitch] = (unsigned char)((d * 171 + e * 85 + 128) >> 8);
michael@0 166
michael@0 167 src++;
michael@0 168 des++;
michael@0 169
michael@0 170 }
michael@0 171 }
michael@0 172
michael@0 173 /****************************************************************************
michael@0 174 *
michael@0 175 * ROUTINE : vp8_horizontal_line_1_2_scale_c
michael@0 176 *
michael@0 177 * INPUTS : const unsigned char *source : Pointer to source data.
michael@0 178 * unsigned int source_width : Stride of source.
michael@0 179 * unsigned char *dest : Pointer to destination data.
michael@0 180 * unsigned int dest_width : Stride of destination (NOT USED).
michael@0 181 *
michael@0 182 * OUTPUTS : None.
michael@0 183 *
michael@0 184 * RETURNS : void
michael@0 185 *
michael@0 186 * FUNCTION : Copies horizontal line of pixels from source to
michael@0 187 * destination scaling up by 1 to 2.
michael@0 188 *
michael@0 189 * SPECIAL NOTES : None.
michael@0 190 *
michael@0 191 ****************************************************************************/
michael@0 192 void vp8_horizontal_line_2_1_scale_c(const unsigned char *source,
michael@0 193 unsigned int source_width,
michael@0 194 unsigned char *dest,
michael@0 195 unsigned int dest_width) {
michael@0 196 unsigned int i;
michael@0 197 unsigned int a;
michael@0 198 unsigned char *des = dest;
michael@0 199 const unsigned char *src = source;
michael@0 200
michael@0 201 (void) dest_width;
michael@0 202
michael@0 203 for (i = 0; i < source_width; i += 2) {
michael@0 204 a = src[0];
michael@0 205 des [0] = (unsigned char)(a);
michael@0 206 src += 2;
michael@0 207 des += 1;
michael@0 208 }
michael@0 209 }
michael@0 210
michael@0 211 void vp8_vertical_band_2_1_scale_c(unsigned char *source,
michael@0 212 unsigned int src_pitch,
michael@0 213 unsigned char *dest,
michael@0 214 unsigned int dest_pitch,
michael@0 215 unsigned int dest_width) {
michael@0 216 (void) dest_pitch;
michael@0 217 (void) src_pitch;
michael@0 218 vpx_memcpy(dest, source, dest_width);
michael@0 219 }
michael@0 220
michael@0 221 void vp8_vertical_band_2_1_scale_i_c(unsigned char *source,
michael@0 222 unsigned int src_pitch,
michael@0 223 unsigned char *dest,
michael@0 224 unsigned int dest_pitch,
michael@0 225 unsigned int dest_width) {
michael@0 226 int i;
michael@0 227 int temp;
michael@0 228 int width = dest_width;
michael@0 229
michael@0 230 (void) dest_pitch;
michael@0 231
michael@0 232 for (i = 0; i < width; i++) {
michael@0 233 temp = 8;
michael@0 234 temp += source[i - (int)src_pitch] * 3;
michael@0 235 temp += source[i] * 10;
michael@0 236 temp += source[i + src_pitch] * 3;
michael@0 237 temp >>= 4;
michael@0 238 dest[i] = (unsigned char)(temp);
michael@0 239 }
michael@0 240 }

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