1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libvpx/vpx_scale/generic/gen_scalers.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,240 @@
1.4 +/*
1.5 + * Copyright (c) 2010 The WebM project authors. All Rights Reserved.
1.6 + *
1.7 + * Use of this source code is governed by a BSD-style license
1.8 + * that can be found in the LICENSE file in the root of the source
1.9 + * tree. An additional intellectual property rights grant can be found
1.10 + * in the file PATENTS. All contributing project authors may
1.11 + * be found in the AUTHORS file in the root of the source tree.
1.12 + */
1.13 +
1.14 +
1.15 +#include "vpx_scale/vpx_scale.h"
1.16 +#include "vpx_mem/vpx_mem.h"
1.17 +/****************************************************************************
1.18 +* Imports
1.19 +****************************************************************************/
1.20 +
1.21 +/****************************************************************************
1.22 + *
1.23 + *
1.24 + * INPUTS : const unsigned char *source : Pointer to source data.
1.25 + * unsigned int source_width : Stride of source.
1.26 + * unsigned char *dest : Pointer to destination data.
1.27 + * unsigned int dest_width : Stride of destination (NOT USED).
1.28 + *
1.29 + * OUTPUTS : None.
1.30 + *
1.31 + * RETURNS : void
1.32 + *
1.33 + * FUNCTION : Copies horizontal line of pixels from source to
1.34 + * destination scaling up by 4 to 5.
1.35 + *
1.36 + * SPECIAL NOTES : None.
1.37 + *
1.38 + ****************************************************************************/
1.39 +void vp8_horizontal_line_5_4_scale_c(const unsigned char *source,
1.40 + unsigned int source_width,
1.41 + unsigned char *dest,
1.42 + unsigned int dest_width) {
1.43 + unsigned i;
1.44 + unsigned int a, b, c, d, e;
1.45 + unsigned char *des = dest;
1.46 + const unsigned char *src = source;
1.47 +
1.48 + (void) dest_width;
1.49 +
1.50 + for (i = 0; i < source_width; i += 5) {
1.51 + a = src[0];
1.52 + b = src[1];
1.53 + c = src[2];
1.54 + d = src[3];
1.55 + e = src[4];
1.56 +
1.57 + des[0] = (unsigned char) a;
1.58 + des[1] = (unsigned char)((b * 192 + c * 64 + 128) >> 8);
1.59 + des[2] = (unsigned char)((c * 128 + d * 128 + 128) >> 8);
1.60 + des[3] = (unsigned char)((d * 64 + e * 192 + 128) >> 8);
1.61 +
1.62 + src += 5;
1.63 + des += 4;
1.64 + }
1.65 +}
1.66 +
1.67 +
1.68 +
1.69 +
1.70 +void vp8_vertical_band_5_4_scale_c(unsigned char *source,
1.71 + unsigned int src_pitch,
1.72 + unsigned char *dest,
1.73 + unsigned int dest_pitch,
1.74 + unsigned int dest_width) {
1.75 + unsigned int i;
1.76 + unsigned int a, b, c, d, e;
1.77 + unsigned char *des = dest;
1.78 + unsigned char *src = source;
1.79 +
1.80 + for (i = 0; i < dest_width; i++) {
1.81 +
1.82 + a = src[0 * src_pitch];
1.83 + b = src[1 * src_pitch];
1.84 + c = src[2 * src_pitch];
1.85 + d = src[3 * src_pitch];
1.86 + e = src[4 * src_pitch];
1.87 +
1.88 + des[0 * dest_pitch] = (unsigned char) a;
1.89 + des[1 * dest_pitch] = (unsigned char)((b * 192 + c * 64 + 128) >> 8);
1.90 + des[2 * dest_pitch] = (unsigned char)((c * 128 + d * 128 + 128) >> 8);
1.91 + des[3 * dest_pitch] = (unsigned char)((d * 64 + e * 192 + 128) >> 8);
1.92 +
1.93 + src++;
1.94 + des++;
1.95 +
1.96 + }
1.97 +}
1.98 +
1.99 +
1.100 +/*7***************************************************************************
1.101 + *
1.102 + * ROUTINE : vp8_horizontal_line_3_5_scale_c
1.103 + *
1.104 + * INPUTS : const unsigned char *source : Pointer to source data.
1.105 + * unsigned int source_width : Stride of source.
1.106 + * unsigned char *dest : Pointer to destination data.
1.107 + * unsigned int dest_width : Stride of destination (NOT USED).
1.108 + *
1.109 + * OUTPUTS : None.
1.110 + *
1.111 + * RETURNS : void
1.112 + *
1.113 + * FUNCTION : Copies horizontal line of pixels from source to
1.114 + * destination scaling up by 3 to 5.
1.115 + *
1.116 + * SPECIAL NOTES : None.
1.117 + *
1.118 + *
1.119 + ****************************************************************************/
1.120 +void vp8_horizontal_line_5_3_scale_c(const unsigned char *source,
1.121 + unsigned int source_width,
1.122 + unsigned char *dest,
1.123 + unsigned int dest_width) {
1.124 + unsigned int i;
1.125 + unsigned int a, b, c, d, e;
1.126 + unsigned char *des = dest;
1.127 + const unsigned char *src = source;
1.128 +
1.129 + (void) dest_width;
1.130 +
1.131 + for (i = 0; i < source_width; i += 5) {
1.132 + a = src[0];
1.133 + b = src[1];
1.134 + c = src[2];
1.135 + d = src[3];
1.136 + e = src[4];
1.137 +
1.138 + des[0] = (unsigned char) a;
1.139 + des[1] = (unsigned char)((b * 85 + c * 171 + 128) >> 8);
1.140 + des[2] = (unsigned char)((d * 171 + e * 85 + 128) >> 8);
1.141 +
1.142 + src += 5;
1.143 + des += 3;
1.144 + }
1.145 +
1.146 +}
1.147 +
1.148 +void vp8_vertical_band_5_3_scale_c(unsigned char *source,
1.149 + unsigned int src_pitch,
1.150 + unsigned char *dest,
1.151 + unsigned int dest_pitch,
1.152 + unsigned int dest_width) {
1.153 + unsigned int i;
1.154 + unsigned int a, b, c, d, e;
1.155 + unsigned char *des = dest;
1.156 + unsigned char *src = source;
1.157 +
1.158 + for (i = 0; i < dest_width; i++) {
1.159 +
1.160 + a = src[0 * src_pitch];
1.161 + b = src[1 * src_pitch];
1.162 + c = src[2 * src_pitch];
1.163 + d = src[3 * src_pitch];
1.164 + e = src[4 * src_pitch];
1.165 +
1.166 + des[0 * dest_pitch] = (unsigned char) a;
1.167 + des[1 * dest_pitch] = (unsigned char)((b * 85 + c * 171 + 128) >> 8);
1.168 + des[2 * dest_pitch] = (unsigned char)((d * 171 + e * 85 + 128) >> 8);
1.169 +
1.170 + src++;
1.171 + des++;
1.172 +
1.173 + }
1.174 +}
1.175 +
1.176 +/****************************************************************************
1.177 + *
1.178 + * ROUTINE : vp8_horizontal_line_1_2_scale_c
1.179 + *
1.180 + * INPUTS : const unsigned char *source : Pointer to source data.
1.181 + * unsigned int source_width : Stride of source.
1.182 + * unsigned char *dest : Pointer to destination data.
1.183 + * unsigned int dest_width : Stride of destination (NOT USED).
1.184 + *
1.185 + * OUTPUTS : None.
1.186 + *
1.187 + * RETURNS : void
1.188 + *
1.189 + * FUNCTION : Copies horizontal line of pixels from source to
1.190 + * destination scaling up by 1 to 2.
1.191 + *
1.192 + * SPECIAL NOTES : None.
1.193 + *
1.194 + ****************************************************************************/
1.195 +void vp8_horizontal_line_2_1_scale_c(const unsigned char *source,
1.196 + unsigned int source_width,
1.197 + unsigned char *dest,
1.198 + unsigned int dest_width) {
1.199 + unsigned int i;
1.200 + unsigned int a;
1.201 + unsigned char *des = dest;
1.202 + const unsigned char *src = source;
1.203 +
1.204 + (void) dest_width;
1.205 +
1.206 + for (i = 0; i < source_width; i += 2) {
1.207 + a = src[0];
1.208 + des [0] = (unsigned char)(a);
1.209 + src += 2;
1.210 + des += 1;
1.211 + }
1.212 +}
1.213 +
1.214 +void vp8_vertical_band_2_1_scale_c(unsigned char *source,
1.215 + unsigned int src_pitch,
1.216 + unsigned char *dest,
1.217 + unsigned int dest_pitch,
1.218 + unsigned int dest_width) {
1.219 + (void) dest_pitch;
1.220 + (void) src_pitch;
1.221 + vpx_memcpy(dest, source, dest_width);
1.222 +}
1.223 +
1.224 +void vp8_vertical_band_2_1_scale_i_c(unsigned char *source,
1.225 + unsigned int src_pitch,
1.226 + unsigned char *dest,
1.227 + unsigned int dest_pitch,
1.228 + unsigned int dest_width) {
1.229 + int i;
1.230 + int temp;
1.231 + int width = dest_width;
1.232 +
1.233 + (void) dest_pitch;
1.234 +
1.235 + for (i = 0; i < width; i++) {
1.236 + temp = 8;
1.237 + temp += source[i - (int)src_pitch] * 3;
1.238 + temp += source[i] * 10;
1.239 + temp += source[i + src_pitch] * 3;
1.240 + temp >>= 4;
1.241 + dest[i] = (unsigned char)(temp);
1.242 + }
1.243 +}
