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/*
* Copyright © 2004 Eric Anholt
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the name of Eric Anholt not be used in
* advertising or publicity pertaining to distribution of the software without
* specific, written prior permission. Eric Anholt makes no
* representations about the suitability of this software for any purpose. It
* is provided "as is" without express or implied warranty.
*
* ERIC ANHOLT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL ERIC ANHOLT BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
#include <stdlib.h>
#include "rendercheck.h"
#define mult_chan(src, dst, Fa, Fb) \
min((double)(src) * (double)(Fa) + (double)(dst) * (double)(Fb), 1.0)
static double
calc_op(int op, double src, double dst, double srca, double dsta)
{
double Fa, Fb;
switch (op) {
case PictOpClear:
case PictOpDisjointClear:
case PictOpConjointClear:
return mult_chan(src, dst, 0.0, 0.0);
case PictOpSrc:
case PictOpDisjointSrc:
case PictOpConjointSrc:
return mult_chan(src, dst, 1.0, 0.0);
case PictOpDst:
case PictOpDisjointDst:
case PictOpConjointDst:
return mult_chan(src, dst, 0.0, 1.0);
case PictOpOver:
return mult_chan(src, dst, 1.0, 1.0 - srca);
case PictOpOverReverse:
return mult_chan(src, dst, 1.0 - dsta, 1.0);
case PictOpIn:
return mult_chan(src, dst, dsta, 0.0);
case PictOpInReverse:
return mult_chan(src, dst, 0.0, srca);
case PictOpOut:
return mult_chan(src, dst, 1.0 - dsta, 0.0);
case PictOpOutReverse:
return mult_chan(src, dst, 0.0, 1.0 - srca);
case PictOpAtop:
return mult_chan(src, dst, dsta, 1.0 - srca);
case PictOpAtopReverse:
return mult_chan(src, dst, 1.0 - dsta, srca);
case PictOpXor:
return mult_chan(src, dst, 1.0 - dsta, 1.0 - srca);
case PictOpAdd:
return mult_chan(src, dst, 1.0, 1.0);
break;
case PictOpSaturate:
case PictOpDisjointOverReverse:
if (srca == 0.0)
Fa = 1.0;
else
Fa = min(1.0, (1.0 - dsta) / srca);
return mult_chan(src, dst, Fa, 1.0);
case PictOpDisjointOver:
if (dsta == 0.0)
Fb = 1.0;
else
Fb = min(1.0, (1.0 - srca) / dsta);
return mult_chan(src, dst, 1.0, Fb);
case PictOpDisjointIn:
if (srca == 0.0)
Fa = 0.0;
else
Fa = max(0.0, 1.0 - (1.0 - dsta) / srca);
return mult_chan(src, dst, Fa, 0.0);
case PictOpDisjointInReverse:
if (dsta == 0.0)
Fb = 0.0;
else
Fb = max(0.0, 1.0 - (1.0 - srca) / dsta);
return mult_chan(src, dst, 0.0, Fb);
case PictOpDisjointOut:
if (srca == 0.0)
Fa = 1.0;
else
Fa = min(1.0, (1.0 - dsta) / srca);
return mult_chan(src, dst, Fa, 0.0);
case PictOpDisjointOutReverse:
if (dsta == 0.0)
Fb = 1.0;
else
Fb = min(1.0, (1.0 - srca) / dsta);
return mult_chan(src, dst, 0.0, Fb);
case PictOpDisjointAtop:
if (srca == 0.0)
Fa = 0.0;
else
Fa = max(0.0, 1.0 - (1.0 - dsta) / srca);
if (dsta == 0.0)
Fb = 1.0;
else
Fb = min(1.0, (1.0 - srca) / dsta);
return mult_chan(src, dst, Fa, Fb);
case PictOpDisjointAtopReverse:
if (srca == 0.0)
Fa = 1.0;
else
Fa = min(1.0, (1.0 - dsta) / srca);
if (dsta == 0.0)
Fb = 0.0;
else
Fb = max(0.0, 1.0 - (1.0 - srca) / dsta);
return mult_chan(src, dst, Fa, Fb);
case PictOpDisjointXor:
if (srca == 0.0)
Fa = 1.0;
else
Fa = min(1.0, (1.0 - dsta) / srca);
if (dsta == 0.0)
Fb = 1.0;
else
Fb = min(1.0, (1.0 - srca) / dsta);
return mult_chan(src, dst, Fa, Fb);
case PictOpConjointOver:
if (dsta == 0.0)
Fb = 0.0;
else
Fb = max(0.0, 1.0 - srca / dsta);
return mult_chan(src, dst, 1.0, Fb);
case PictOpConjointOverReverse:
if (srca == 0.0)
Fa = 0.0;
else
Fa = max(0.0, 1.0 - dsta / srca);
return mult_chan(src, dst, Fa, 1.0);
case PictOpConjointIn:
if (srca == 0.0)
Fa = 1.0;
else
Fa = min(1.0, dsta / srca);
return mult_chan(src, dst, Fa, 0.0);
case PictOpConjointInReverse:
if (dsta == 0.0)
Fb = 1.0;
else
Fb = min(1.0, srca / dsta);
return mult_chan(src, dst, 0.0, Fb);
case PictOpConjointOut:
if (srca == 0.0)
Fa = 0.0;
else
Fa = max(0.0, 1.0 - dsta / srca);
return mult_chan(src, dst, Fa, 0.0);
case PictOpConjointOutReverse:
if (dsta == 0.0)
Fb = 0.0;
else
Fb = max(0.0, 1.0 - srca / dsta);
return mult_chan(src, dst, 0.0, Fb);
case PictOpConjointAtop:
if (srca == 0.0)
Fa = 1.0;
else
Fa = min(1.0, dsta / srca);
if (dsta == 0.0)
Fb = 0.0;
else
Fb = max(0.0, 1.0 - srca / dsta);
return mult_chan(src, dst, Fa, Fb);
case PictOpConjointAtopReverse:
if (srca == 0.0)
Fa = 0.0;
else
Fa = max(0.0, 1.0 - dsta / srca);
if (dsta == 0.0)
Fb = 1.0;
else
Fb = min(1.0, srca / dsta);
return mult_chan(src, dst, Fa, Fb);
case PictOpConjointXor:
if (srca == 0.0)
Fa = 0.0;
else
Fa = max(0.0, 1.0 - dsta / srca);
if (dsta == 0.0)
Fb = 0.0;
else
Fb = max(0.0, 1.0 - srca / dsta);
return mult_chan(src, dst, Fa, Fb);
default:
abort();
}
}
void
do_composite(int op,
const color4d *src,
const color4d *mask,
const color4d *dst,
color4d *result,
bool componentAlpha)
{
color4d srcval, srcalpha;
if (mask != NULL && componentAlpha) {
srcval.r = src->r * mask->r;
srcval.g = src->g * mask->g;
srcval.b = src->b * mask->b;
srcval.a = src->a * mask->a;
srcalpha.r = src->a * mask->r;
srcalpha.g = src->a * mask->g;
srcalpha.b = src->a * mask->b;
srcalpha.a = src->a * mask->a;
} else if (mask != NULL) {
srcval.r = src->r * mask->a;
srcval.g = src->g * mask->a;
srcval.b = src->b * mask->a;
srcval.a = src->a * mask->a;
srcalpha.r = src->a * mask->a;
srcalpha.g = src->a * mask->a;
srcalpha.b = src->a * mask->a;
srcalpha.a = src->a * mask->a;
} else {
srcval = *src;
srcalpha.r = src->a;
srcalpha.g = src->a;
srcalpha.b = src->a;
srcalpha.a = src->a;
}
result->r = calc_op(op, srcval.r, dst->r, srcalpha.r, dst->a);
result->g = calc_op(op, srcval.g, dst->g, srcalpha.g, dst->a);
result->b = calc_op(op, srcval.b, dst->b, srcalpha.b, dst->a);
result->a = calc_op(op, srcval.a, dst->a, srcalpha.a, dst->a);
}
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