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vpx/vpx_scale/generic/gen_scalers.c
Timothy B. Terriberry c4d7e5e67e Eliminate more warnings. 
This eliminates a large set of warnings exposed by the Mozilla build
 system (Use of C++ comments in ISO C90 source, commas at the end of
 enum lists, a couple incomplete initializers, and signed/unsigned
 comparisons).
It also eliminates many (but not all) of the warnings expose by newer
 GCC versions and _FORTIFY_SOURCE (e.g., calling fread and fwrite
 without checking the return values).
There are a few spurious warnings left on my system:

../vp8/encoder/encodemb.c:274:9: warning: 'sz' may be used
 uninitialized in this function
gcc seems to be unable to figure out that the value shortcut doesn't
 change between the two if blocks that test it here.

../vp8/encoder/onyx_if.c:5314:5: warning: comparison of unsigned
 expression >= 0 is always true
../vp8/encoder/onyx_if.c:5319:5: warning: comparison of unsigned
 expression >= 0 is always true
This is true, so far as it goes, but it's comparing against an enum, and the C
 standard does not mandate that enums be unsigned, so the checks can't be
 removed.

Change-Id: Iaf689ae3e3d0ddc5ade00faa474debe73b8d3395
2010-10-27 18:08:04 -07:00

957 lines
28 KiB
C
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/*
* 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/vpxscale.h"
#include "vpx_mem/vpx_mem.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.
*
****************************************************************************/
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.
*
****************************************************************************/
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.
*
****************************************************************************/
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_2_3_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 2 to 3.
*
* SPECIAL NOTES : None.
*
*
****************************************************************************/
void vp8cx_horizontal_line_2_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;
unsigned char *des = dest;
const unsigned char *src = source;
(void) dest_width;
for (i = 0; i < source_width - 2; i += 2)
{
a = src[0];
b = src[1];
c = src[2];
des [0] = (unsigned char)(a);
des [1] = (unsigned char)((a * 85 + 171 * b + 128) >> 8);
des [2] = (unsigned char)((b * 171 + 85 * c + 128) >> 8);
src += 2;
des += 3;
}
a = src[0];
b = src[1];
des [0] = (unsigned char)(a);
des [1] = (unsigned char)((a * 85 + 171 * b + 128) >> 8);
des [2] = (unsigned char)(b);
}
/****************************************************************************
*
* ROUTINE : vp8cx_vertical_band_2_3_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 2 to 3. The
* height of the band scaled is 2-pixels.
*
* SPECIAL NOTES : The routine uses the first line of the band below
* the current band.
*
****************************************************************************/
void vp8cx_vertical_band_2_3_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];
c = des[dest_pitch*3];
des [dest_pitch ] = (unsigned char)((a * 85 + 171 * b + 128) >> 8);
des [dest_pitch*2] = (unsigned char)((b * 171 + 85 * c + 128) >> 8);
des++;
}
}
/****************************************************************************
*
* ROUTINE : vp8cx_last_vertical_band_2_3_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 2 to 3. The
* height of the band scaled is 2-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.
*
****************************************************************************/
void vp8cx_last_vertical_band_2_3_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];
des [dest_pitch ] = (unsigned char)((a * 85 + 171 * b + 128) >> 8);
des [dest_pitch*2] = (unsigned char)(b);
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.
*
*
****************************************************************************/
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.
*
****************************************************************************/
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.
*
****************************************************************************/
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_3_4_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 4.
*
* SPECIAL NOTES : None.
*
*
****************************************************************************/
void vp8cx_horizontal_line_3_4_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 * 64 + b * 192 + 128) >> 8);
c = src[2];
des [2] = (unsigned char)((b + c + 1) >> 1);
a = src[3];
des [3] = (unsigned char)((c * 192 + a * 64 + 128) >> 8);
src += 3;
des += 4;
}
a = src[0];
b = src[1];
des [0] = (unsigned char)(a);
des [1] = (unsigned char)((a * 64 + b * 192 + 128) >> 8);
c = src[2] ;
des [2] = (unsigned char)((b + c + 1) >> 1);
des [3] = (unsigned char)(c);
}
/****************************************************************************
*
* ROUTINE : vp8cx_vertical_band_3_4_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 4. The
* height of the band scaled is 3-pixels.
*
* SPECIAL NOTES : The routine uses the first line of the band below
* the current band.
*
****************************************************************************/
void vp8cx_vertical_band_3_4_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 * 64 + b * 192 + 128) >> 8);
c = des[dest_pitch*2];
des [dest_pitch*2] = (unsigned char)((b + c + 1) >> 1);
/* First line in next band... */
a = des [dest_pitch*4];
des [dest_pitch*3] = (unsigned char)((c * 192 + a * 64 + 128) >> 8);
des++;
}
}
/****************************************************************************
*
* ROUTINE : vp8cx_last_vertical_band_3_4_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 4. 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.
*
****************************************************************************/
void vp8cx_last_vertical_band_3_4_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 * 64 + b * 192 + 128) >> 8);
c = des[dest_pitch*2];
des [dest_pitch*2] = (unsigned char)((b + c + 1) >> 1);
/* No other line for interplation of this line, so .. */
des [dest_pitch*3] = (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.
*
****************************************************************************/
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.
*
****************************************************************************/
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.
*
****************************************************************************/
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++;
}
}
/****************************************************************************
*
* 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.
*
****************************************************************************/
void vp8cx_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 vp8cx_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 : 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.
*
*
****************************************************************************/
void vp8cx_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 vp8cx_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 : 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.
*
****************************************************************************/
void vp8cx_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 vp8cx_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 vp8cx_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);
}
}
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