1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
|
/*
* 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);
}
|
