ref: 1c3398675fedbbf63e6bae2b25420669a07194a5
dir: /vpx_scale/generic/gen_scalers.c/
/*
* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "vpx_scale/vpx_scale.h"
#include "vpx_mem/vpx_mem.h"
/****************************************************************************
* Imports
****************************************************************************/
/****************************************************************************
*
*
* INPUTS : const unsigned char *source : Pointer to source data.
* unsigned int source_width : Stride of source.
* unsigned char *dest : Pointer to destination data.
* unsigned int dest_width : Stride of destination (NOT USED).
*
* OUTPUTS : None.
*
* RETURNS : void
*
* FUNCTION : Copies horizontal line of pixels from source to
* destination scaling up by 4 to 5.
*
* SPECIAL NOTES : None.
*
****************************************************************************/
void vp8_horizontal_line_5_4_scale_c(const unsigned char *source,
unsigned int source_width,
unsigned char *dest,
unsigned int dest_width) {
unsigned i;
unsigned int a, b, c, d, e;
unsigned char *des = dest;
const unsigned char *src = source;
(void) dest_width;
for (i = 0; i < source_width; i += 5) {
a = src[0];
b = src[1];
c = src[2];
d = src[3];
e = src[4];
des[0] = (unsigned char) a;
des[1] = (unsigned char)((b * 192 + c * 64 + 128) >> 8);
des[2] = (unsigned char)((c * 128 + d * 128 + 128) >> 8);
des[3] = (unsigned char)((d * 64 + e * 192 + 128) >> 8);
src += 5;
des += 4;
}
}
void vp8_vertical_band_5_4_scale_c(unsigned char *source,
unsigned int src_pitch,
unsigned char *dest,
unsigned int dest_pitch,
unsigned int dest_width) {
unsigned int i;
unsigned int a, b, c, d, e;
unsigned char *des = dest;
unsigned char *src = source;
for (i = 0; i < dest_width; i++) {
a = src[0 * src_pitch];
b = src[1 * src_pitch];
c = src[2 * src_pitch];
d = src[3 * src_pitch];
e = src[4 * src_pitch];
des[0 * dest_pitch] = (unsigned char) a;
des[1 * dest_pitch] = (unsigned char)((b * 192 + c * 64 + 128) >> 8);
des[2 * dest_pitch] = (unsigned char)((c * 128 + d * 128 + 128) >> 8);
des[3 * dest_pitch] = (unsigned char)((d * 64 + e * 192 + 128) >> 8);
src++;
des++;
}
}
/*7***************************************************************************
*
* ROUTINE : vp8_horizontal_line_3_5_scale_c
*
* INPUTS : const unsigned char *source : Pointer to source data.
* unsigned int source_width : Stride of source.
* unsigned char *dest : Pointer to destination data.
* unsigned int dest_width : Stride of destination (NOT USED).
*
* OUTPUTS : None.
*
* RETURNS : void
*
* FUNCTION : Copies horizontal line of pixels from source to
* destination scaling up by 3 to 5.
*
* SPECIAL NOTES : None.
*
*
****************************************************************************/
void vp8_horizontal_line_5_3_scale_c(const unsigned char *source,
unsigned int source_width,
unsigned char *dest,
unsigned int dest_width) {
unsigned int i;
unsigned int a, b, c, d, e;
unsigned char *des = dest;
const unsigned char *src = source;
(void) dest_width;
for (i = 0; i < source_width; i += 5) {
a = src[0];
b = src[1];
c = src[2];
d = src[3];
e = src[4];
des[0] = (unsigned char) a;
des[1] = (unsigned char)((b * 85 + c * 171 + 128) >> 8);
des[2] = (unsigned char)((d * 171 + e * 85 + 128) >> 8);
src += 5;
des += 3;
}
}
void vp8_vertical_band_5_3_scale_c(unsigned char *source,
unsigned int src_pitch,
unsigned char *dest,
unsigned int dest_pitch,
unsigned int dest_width) {
unsigned int i;
unsigned int a, b, c, d, e;
unsigned char *des = dest;
unsigned char *src = source;
for (i = 0; i < dest_width; i++) {
a = src[0 * src_pitch];
b = src[1 * src_pitch];
c = src[2 * src_pitch];
d = src[3 * src_pitch];
e = src[4 * src_pitch];
des[0 * dest_pitch] = (unsigned char) a;
des[1 * dest_pitch] = (unsigned char)((b * 85 + c * 171 + 128) >> 8);
des[2 * dest_pitch] = (unsigned char)((d * 171 + e * 85 + 128) >> 8);
src++;
des++;
}
}
/****************************************************************************
*
* ROUTINE : vp8_horizontal_line_1_2_scale_c
*
* INPUTS : const unsigned char *source : Pointer to source data.
* unsigned int source_width : Stride of source.
* unsigned char *dest : Pointer to destination data.
* unsigned int dest_width : Stride of destination (NOT USED).
*
* OUTPUTS : None.
*
* RETURNS : void
*
* FUNCTION : Copies horizontal line of pixels from source to
* destination scaling up by 1 to 2.
*
* SPECIAL NOTES : None.
*
****************************************************************************/
void vp8_horizontal_line_2_1_scale_c(const unsigned char *source,
unsigned int source_width,
unsigned char *dest,
unsigned int dest_width) {
unsigned int i;
unsigned int a;
unsigned char *des = dest;
const unsigned char *src = source;
(void) dest_width;
for (i = 0; i < source_width; i += 2) {
a = src[0];
des [0] = (unsigned char)(a);
src += 2;
des += 1;
}
}
void vp8_vertical_band_2_1_scale_c(unsigned char *source,
unsigned int src_pitch,
unsigned char *dest,
unsigned int dest_pitch,
unsigned int dest_width) {
(void) dest_pitch;
(void) src_pitch;
vpx_memcpy(dest, source, dest_width);
}
void vp8_vertical_band_2_1_scale_i_c(unsigned char *source,
unsigned int src_pitch,
unsigned char *dest,
unsigned int dest_pitch,
unsigned int dest_width) {
int i;
int temp;
int width = dest_width;
(void) dest_pitch;
for (i = 0; i < width; i++) {
temp = 8;
temp += source[i - (int)src_pitch] * 3;
temp += source[i] * 10;
temp += source[i + src_pitch] * 3;
temp >>= 4;
dest[i] = (unsigned char)(temp);
}
}