mirror of
https://github.com/ValveSoftware/Proton.git
synced 2024-12-30 16:45:36 +03:00
86 lines
2.5 KiB
C
86 lines
2.5 KiB
C
|
//*@@@+++@@@@******************************************************************
|
|||
|
|
//
|
|||
|
|
// Copyright <20> Microsoft Corp.
|
|||
|
|
// All rights reserved.
|
|||
|
|
//
|
|||
|
|
// Redistribution and use in source and binary forms, with or without
|
|||
|
|
// modification, are permitted provided that the following conditions are met:
|
|||
|
|
//
|
|||
|
|
// <20> Redistributions of source code must retain the above copyright notice,
|
|||
|
|
// this list of conditions and the following disclaimer.
|
|||
|
|
// <20> Redistributions in binary form must reproduce the above copyright notice,
|
|||
|
|
// this list of conditions and the following disclaimer in the documentation
|
|||
|
|
// and/or other materials provided with the distribution.
|
|||
|
|
//
|
|||
|
|
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|||
|
|
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|||
|
|
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|||
|
|
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
|
|||
|
|
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|||
|
|
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|||
|
|
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|||
|
|
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|||
|
|
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|||
|
|
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|||
|
|
// POSSIBILITY OF SUCH DAMAGE.
|
|||
|
|
//
|
|||
|
|
//*@@@---@@@@******************************************************************
|
|||
|
|
|
|||
|
|
#include "strTransform.h"
|
|||
|
|
|
|||
|
|
/** need to swap b and c **/
|
|||
|
|
/** rounding behavior: [0 0 0 0] <-> [+ - - -]
|
|||
|
|
[+ + + +] <-> [+3/4 - - -]
|
|||
|
|
[- - - -] <-> [- - - -] **/
|
|||
|
|
Void strDCT2x2dn(PixelI *pa, PixelI *pb, PixelI *pc, PixelI *pd)
|
|||
|
|
{
|
|||
|
|
PixelI a, b, c, d, C, t;
|
|||
|
|
a = *pa;
|
|||
|
|
b = *pb;
|
|||
|
|
C = *pc;
|
|||
|
|
d = *pd;
|
|||
|
|
|
|||
|
|
a += d;
|
|||
|
|
b -= C;
|
|||
|
|
t = ((a - b) >> 1);
|
|||
|
|
c = t - d;
|
|||
|
|
d = t - C;
|
|||
|
|
a -= d;
|
|||
|
|
b += c;
|
|||
|
|
|
|||
|
|
*pa = a;
|
|||
|
|
*pb = b;
|
|||
|
|
*pc = c;
|
|||
|
|
*pd = d;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
Void strDCT2x2up(PixelI *pa, PixelI *pb, PixelI *pc, PixelI *pd)
|
|||
|
|
{
|
|||
|
|
PixelI a, b, c, d, C, t;
|
|||
|
|
a = *pa;
|
|||
|
|
b = *pb;
|
|||
|
|
C = *pc;
|
|||
|
|
d = *pd;
|
|||
|
|
|
|||
|
|
a += d;
|
|||
|
|
b -= C;
|
|||
|
|
t = ((a - b + 1) >> 1);
|
|||
|
|
c = t - d;
|
|||
|
|
d = t - C;
|
|||
|
|
a -= d;
|
|||
|
|
b += c;
|
|||
|
|
|
|||
|
|
*pa = a;
|
|||
|
|
*pb = b;
|
|||
|
|
*pc = c;
|
|||
|
|
*pd = d;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
Void FOURBUTTERFLY_HARDCODED1(PixelI *p)
|
|||
|
|
{
|
|||
|
|
strDCT2x2dn(&p[0], &p[4], &p[8], &p[12]);
|
|||
|
|
strDCT2x2dn(&p[1], &p[5], &p[9], &p[13]);
|
|||
|
|
strDCT2x2dn(&p[2], &p[6], &p[10], &p[14]);
|
|||
|
|
strDCT2x2dn(&p[3], &p[7], &p[11], &p[15]);
|
|||
|
|
}
|