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/*
* Copyright (c) 2010 The VP8 project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license and patent
* grant that can be found in the LICENSE file in the root of the source
* tree. All contributing project authors may be found in the AUTHORS
* file in the root of the source tree.
*/
/****************************************************************************
*
* Module Title : gen_scalers.c
*
* Description : Generic image scaling functions.
*
***************************************************************************/
/****************************************************************************
* Header Files
****************************************************************************/
#include "vpx_scale/vpxscale.h"
/****************************************************************************
* Imports
****************************************************************************/
/****************************************************************************
*
* ROUTINE : vp8cx_horizontal_line_4_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 4 to 5.
*
* SPECIAL NOTES : None.
*
****************************************************************************/
static
void vp8cx_horizontal_line_4_5_scale_c
(
const unsigned char *source,
unsigned int source_width,
unsigned char *dest,
unsigned int dest_width
)
{
unsigned i;
unsigned int a, b, c;
unsigned char *des = dest;
const unsigned char *src = source;
(void) dest_width;
for (i = 0; i < source_width - 4; i += 4)
{
a = src[0];
b = src[1];
des [0] = (unsigned char) a;
des [1] = (unsigned char)((a * 51 + 205 * b + 128) >> 8);
c = src[2] * 154;
a = src[3];
des [2] = (unsigned char)((b * 102 + c + 128) >> 8);
des [3] = (unsigned char)((c + 102 * a + 128) >> 8);
b = src[4];
des [4] = (unsigned char)((a * 205 + 51 * b + 128) >> 8);
src += 4;
des += 5;
}
a = src[0];
b = src[1];
des [0] = (unsigned char)(a);
des [1] = (unsigned char)((a * 51 + 205 * b + 128) >> 8);
c = src[2] * 154;
a = src[3];
des [2] = (unsigned char)((b * 102 + c + 128) >> 8);
des [3] = (unsigned char)((c + 102 * a + 128) >> 8);
des [4] = (unsigned char)(a);
}
/****************************************************************************
*
* ROUTINE : vp8cx_vertical_band_4_5_scale_c
*
* INPUTS : unsigned char *dest : Pointer to destination data.
* unsigned int dest_pitch : Stride of destination data.
* unsigned int dest_width : Width of destination data.
*
* OUTPUTS : None.
*
* RETURNS : void
*
* FUNCTION : Scales vertical band of pixels by scale 4 to 5. The
* height of the band scaled is 4-pixels.
*
* SPECIAL NOTES : The routine uses the first line of the band below
* the current band.
*
****************************************************************************/
static
void vp8cx_vertical_band_4_5_scale_c(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width)
{
unsigned int i;
unsigned int a, b, c, d;
unsigned char *des = dest;
for (i = 0; i < dest_width; i++)
{
a = des [0];
b = des [dest_pitch];
des[dest_pitch] = (unsigned char)((a * 51 + 205 * b + 128) >> 8);
c = des[dest_pitch*2] * 154;
d = des[dest_pitch*3];
des [dest_pitch*2] = (unsigned char)((b * 102 + c + 128) >> 8);
des [dest_pitch*3] = (unsigned char)((c + 102 * d + 128) >> 8);
// First line in next band
a = des [dest_pitch * 5];
des [dest_pitch * 4] = (unsigned char)((d * 205 + 51 * a + 128) >> 8);
des ++;
}
}
/****************************************************************************
*
* ROUTINE : vp8cx_last_vertical_band_4_5_scale_c
*
* INPUTS : unsigned char *dest : Pointer to destination data.
* unsigned int dest_pitch : Stride of destination data.
* unsigned int dest_width : Width of destination data.
*
* OUTPUTS : None.
*
* RETURNS : void
*
* FUNCTION : Scales last vertical band of pixels by scale 4 to 5. The
* height of the band scaled is 4-pixels.
*
* SPECIAL NOTES : The routine does not have available the first line of
* the band below the current band, since this is the
* last band.
*
****************************************************************************/
static
void vp8cx_last_vertical_band_4_5_scale_c(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width)
{
unsigned int i;
unsigned int a, b, c, d;
unsigned char *des = dest;
for (i = 0; i < dest_width; ++i)
{
a = des[0];
b = des[dest_pitch];
des[dest_pitch] = (unsigned char)((a * 51 + 205 * b + 128) >> 8);
c = des[dest_pitch*2] * 154;
d = des[dest_pitch*3];
des [dest_pitch*2] = (unsigned char)((b * 102 + c + 128) >> 8);
des [dest_pitch*3] = (unsigned char)((c + 102 * d + 128) >> 8);
// No other line for interplation of this line, so ..
des[dest_pitch*4] = (unsigned char) d;
des++;
}
}
/****************************************************************************
*
* ROUTINE : vp8cx_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.
*
*
****************************************************************************/
static
void vp8cx_horizontal_line_3_5_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;
unsigned char *des = dest;
const unsigned char *src = source;
(void) dest_width;
for (i = 0; i < source_width - 3; i += 3)
{
a = src[0];
b = src[1];
des [0] = (unsigned char)(a);
des [1] = (unsigned char)((a * 102 + 154 * b + 128) >> 8);
c = src[2] ;
des [2] = (unsigned char)((b * 205 + c * 51 + 128) >> 8);
des [3] = (unsigned char)((b * 51 + c * 205 + 128) >> 8);
a = src[3];
des [4] = (unsigned char)((c * 154 + a * 102 + 128) >> 8);
src += 3;
des += 5;
}
a = src[0];
b = src[1];
des [0] = (unsigned char)(a);
des [1] = (unsigned char)((a * 102 + 154 * b + 128) >> 8);
c = src[2] ;
des [2] = (unsigned char)((b * 205 + c * 51 + 128) >> 8);
des [3] = (unsigned char)((b * 51 + c * 205 + 128) >> 8);
des [4] = (unsigned char)(c);
}
/****************************************************************************
*
* ROUTINE : vp8cx_vertical_band_3_5_scale_c
*
* INPUTS : unsigned char *dest : Pointer to destination data.
* unsigned int dest_pitch : Stride of destination data.
* unsigned int dest_width : Width of destination data.
*
* OUTPUTS : None.
*
* RETURNS : void
*
* FUNCTION : Scales vertical band of pixels by scale 3 to 5. The
* height of the band scaled is 3-pixels.
*
* SPECIAL NOTES : The routine uses the first line of the band below
* the current band.
*
****************************************************************************/
static
void vp8cx_vertical_band_3_5_scale_c(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width)
{
unsigned int i;
unsigned int a, b, c;
unsigned char *des = dest;
for (i = 0; i < dest_width; i++)
{
a = des [0];
b = des [dest_pitch];
des [dest_pitch] = (unsigned char)((a * 102 + 154 * b + 128) >> 8);
c = des[dest_pitch*2];
des [dest_pitch*2] = (unsigned char)((b * 205 + c * 51 + 128) >> 8);
des [dest_pitch*3] = (unsigned char)((b * 51 + c * 205 + 128) >> 8);
// First line in next band...
a = des [dest_pitch * 5];
des [dest_pitch * 4] = (unsigned char)((c * 154 + a * 102 + 128) >> 8);
des++;
}
}
/****************************************************************************
*
* ROUTINE : vp8cx_last_vertical_band_3_5_scale_c
*
* INPUTS : unsigned char *dest : Pointer to destination data.
* unsigned int dest_pitch : Stride of destination data.
* unsigned int dest_width : Width of destination data.
*
* OUTPUTS : None.
*
* RETURNS : void
*
* FUNCTION : Scales last vertical band of pixels by scale 3 to 5. The
* height of the band scaled is 3-pixels.
*
* SPECIAL NOTES : The routine does not have available the first line of
* the band below the current band, since this is the
* last band.
*
****************************************************************************/
static
void vp8cx_last_vertical_band_3_5_scale_c(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width)
{
unsigned int i;
unsigned int a, b, c;
unsigned char *des = dest;
for (i = 0; i < dest_width; ++i)
{
a = des [0];
b = des [dest_pitch];
des [ dest_pitch ] = (unsigned char)((a * 102 + 154 * b + 128) >> 8);
c = des[dest_pitch*2];
des [dest_pitch*2] = (unsigned char)((b * 205 + c * 51 + 128) >> 8);
des [dest_pitch*3] = (unsigned char)((b * 51 + c * 205 + 128) >> 8);
// No other line for interplation of this line, so ..
des [ dest_pitch * 4 ] = (unsigned char)(c) ;
des++;
}
}
/****************************************************************************
*
* ROUTINE : vp8cx_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.
*
****************************************************************************/
static
void vp8cx_horizontal_line_1_2_scale_c
(
const unsigned char *source,
unsigned int source_width,
unsigned char *dest,
unsigned int dest_width
)
{
unsigned int i;
unsigned int a, b;
unsigned char *des = dest;
const unsigned char *src = source;
(void) dest_width;
for (i = 0; i < source_width - 1; i += 1)
{
a = src[0];
b = src[1];
des [0] = (unsigned char)(a);
des [1] = (unsigned char)((a + b + 1) >> 1);
src += 1;
des += 2;
}
a = src[0];
des [0] = (unsigned char)(a);
des [1] = (unsigned char)(a);
}
/****************************************************************************
*
* ROUTINE : vp8cx_vertical_band_1_2_scale_c
*
* INPUTS : unsigned char *dest : Pointer to destination data.
* unsigned int dest_pitch : Stride of destination data.
* unsigned int dest_width : Width of destination data.
*
* OUTPUTS : None.
*
* RETURNS : void
*
* FUNCTION : Scales vertical band of pixels by scale 1 to 2. The
* height of the band scaled is 1-pixel.
*
* SPECIAL NOTES : The routine uses the first line of the band below
* the current band.
*
****************************************************************************/
static
void vp8cx_vertical_band_1_2_scale_c(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width)
{
unsigned int i;
unsigned int a, b;
unsigned char *des = dest;
for (i = 0; i < dest_width; i++)
{
a = des [0];
b = des [dest_pitch * 2];
des[dest_pitch] = (unsigned char)((a + b + 1) >> 1);
des++;
}
}
/****************************************************************************
*
* ROUTINE : vp8cx_last_vertical_band_1_2_scale_c
*
* INPUTS : unsigned char *dest : Pointer to destination data.
* unsigned int dest_pitch : Stride of destination data.
* unsigned int dest_width : Width of destination data.
*
* OUTPUTS : None.
*
* RETURNS : void
*
* FUNCTION : Scales last vertical band of pixels by scale 1 to 2. The
* height of the band scaled is 1-pixel.
*
* SPECIAL NOTES : The routine does not have available the first line of
* the band below the current band, since this is the
* last band.
*
****************************************************************************/
static
void vp8cx_last_vertical_band_1_2_scale_c(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width)
{
unsigned int i;
unsigned char *des = dest;
for (i = 0; i < dest_width; ++i)
{
des[dest_pitch] = des[0];
des++;
}
}
#include "vpx_scale/vpxscale.h"
#include "vpx_mem/vpx_mem.h"
struct vpxglobal_scalling_ptrs_t *g_scaling_ptrs = 0;
int
register_generic_scalers(void)
{
int rv = 0;
g_scaling_ptrs = (struct vpxglobal_scalling_ptrs_t *)vpx_malloc(sizeof(struct vpxglobal_scalling_ptrs_t));
if (g_scaling_ptrs)
{
g_scaling_ptrs->vpxhorizontal_line_1_2_scale_t = vp8cx_horizontal_line_1_2_scale_c;
g_scaling_ptrs->vpxvertical_band_1_2_scale_t = vp8cx_vertical_band_1_2_scale_c;
g_scaling_ptrs->vpxlast_vertical_band_1_2_scale_t = vp8cx_last_vertical_band_1_2_scale_c;
g_scaling_ptrs->vpxhorizontal_line_3_5_scale_t = vp8cx_horizontal_line_3_5_scale_c;
g_scaling_ptrs->vpxvertical_band_3_5_scale_t = vp8cx_vertical_band_3_5_scale_c;
g_scaling_ptrs->vpxlast_vertical_band_3_5_scale_t = vp8cx_last_vertical_band_3_5_scale_c;
g_scaling_ptrs->vpxhorizontal_line_4_5_scale_t = vp8cx_horizontal_line_4_5_scale_c;
g_scaling_ptrs->vpxvertical_band_4_5_scale_t = vp8cx_vertical_band_4_5_scale_c;
g_scaling_ptrs->vpxlast_vertical_band_4_5_scale_t = vp8cx_last_vertical_band_4_5_scale_c;
}
else
{
rv = -1;
}
/*
vp8_horizontal_line_1_2_scale = vp8cx_horizontal_line_1_2_scale_c;
vp8_vertical_band_1_2_scale = vp8cx_vertical_band_1_2_scale_c;
vp8_last_vertical_band_1_2_scale = vp8cx_last_vertical_band_1_2_scale_c;
vp8_horizontal_line_3_5_scale = vp8cx_horizontal_line_3_5_scale_c;
vp8_vertical_band_3_5_scale = vp8cx_vertical_band_3_5_scale_c;
vp8_last_vertical_band_3_5_scale = vp8cx_last_vertical_band_3_5_scale_c;
vp8_horizontal_line_4_5_scale = vp8cx_horizontal_line_4_5_scale_c;
vp8_vertical_band_4_5_scale = vp8cx_vertical_band_4_5_scale_c;
vp8_last_vertical_band_4_5_scale = vp8cx_last_vertical_band_4_5_scale_c;
*/
return rv;
}
int
de_register_generic_scalers(void)
{
int rv = 0;
if (g_scaling_ptrs)
{
vpx_free(g_scaling_ptrs);
g_scaling_ptrs = 0;
}
else
{
rv = -1;
}
return rv;
}