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
|
#define COMPONENT_SIZE
#define MASK
#define ONE_HALF
#define A_SHIFT
#define R_SHIFT
#define G_SHIFT
#define A_MASK
#define R_MASK
#define G_MASK
#define RB_MASK
#define AG_MASK
#define RB_ONE_HALF
#define RB_MASK_PLUS_ONE
#define ALPHA_c(x) ((x) >> A_SHIFT)
#define RED_c(x) (((x) >> R_SHIFT) & MASK)
#define GREEN_c(x) (((x) >> G_SHIFT) & MASK)
#define BLUE_c(x) ((x) & MASK)
/*
* Helper macros.
*/
#define MUL_UNc(a, b, t) \
((t) = (a) * (comp2_t)(b) + ONE_HALF, ((((t) >> G_SHIFT ) + (t) ) >> G_SHIFT ))
#define DIV_UNc(a, b) \
(((comp2_t) (a) * MASK + ((b) / 2)) / (b))
#define ADD_UNc(x, y, t) \
((t) = (x) + (y), \
(comp4_t) (comp1_t) ((t) | (0 - ((t) >> G_SHIFT))))
#define DIV_ONE_UNc(x) \
(((x) + ONE_HALF + (((x) + ONE_HALF) >> G_SHIFT)) >> G_SHIFT)
/*
* The methods below use some tricks to be able to do two color
* components at the same time.
*/
/*
* x_rb = (x_rb * a) / 255
*/
#define UNc_rb_MUL_UNc(x, a, t) \
do \
{ \
t = ((x) & RB_MASK) * (a); \
t += RB_ONE_HALF; \
x = (t + ((t >> G_SHIFT) & RB_MASK)) >> G_SHIFT; \
x &= RB_MASK; \
} while (0)
/*
* x_rb = min (x_rb + y_rb, 255)
*/
#define UNc_rb_ADD_UNc_rb(x, y, t) \
do \
{ \
t = ((x) + (y)); \
t |= RB_MASK_PLUS_ONE - ((t >> G_SHIFT) & RB_MASK); \
x = (t & RB_MASK); \
} while (0)
/*
* x_rb = (x_rb * a_rb) / 255
*/
#define UNc_rb_MUL_UNc_rb(x, a, t) \
do \
{ \
t = (x & MASK) * (a & MASK); \
t |= (x & R_MASK) * ((a >> R_SHIFT) & MASK); \
t += RB_ONE_HALF; \
t = (t + ((t >> G_SHIFT) & RB_MASK)) >> G_SHIFT; \
x = t & RB_MASK; \
} while (0)
/*
* x_c = (x_c * a) / 255
*/
#define UNcx4_MUL_UNc(x, a) \
do \
{ \
comp4_t r1__, r2__, t__; \
\
r1__ = (x); \
UNc_rb_MUL_UNc (r1__, (a), t__); \
\
r2__ = (x) >> G_SHIFT; \
UNc_rb_MUL_UNc (r2__, (a), t__); \
\
(x) = r1__ | (r2__ << G_SHIFT); \
} while (0)
/*
* x_c = (x_c * a) / 255 + y_c
*/
#define UNcx4_MUL_UNc_ADD_UNcx4(x, a, y) \
do \
{ \
comp4_t r1__, r2__, r3__, t__; \
\
r1__ = (x); \
r2__ = (y) & RB_MASK; \
UNc_rb_MUL_UNc (r1__, (a), t__); \
UNc_rb_ADD_UNc_rb (r1__, r2__, t__); \
\
r2__ = (x) >> G_SHIFT; \
r3__ = ((y) >> G_SHIFT) & RB_MASK; \
UNc_rb_MUL_UNc (r2__, (a), t__); \
UNc_rb_ADD_UNc_rb (r2__, r3__, t__); \
\
(x) = r1__ | (r2__ << G_SHIFT); \
} while (0)
/*
* x_c = (x_c * a + y_c * b) / 255
*/
#define UNcx4_MUL_UNc_ADD_UNcx4_MUL_UNc(x, a, y, b) \
do \
{ \
comp4_t r1__, r2__, r3__, t__; \
\
r1__ = (x); \
r2__ = (y); \
UNc_rb_MUL_UNc (r1__, (a), t__); \
UNc_rb_MUL_UNc (r2__, (b), t__); \
UNc_rb_ADD_UNc_rb (r1__, r2__, t__); \
\
r2__ = ((x) >> G_SHIFT); \
r3__ = ((y) >> G_SHIFT); \
UNc_rb_MUL_UNc (r2__, (a), t__); \
UNc_rb_MUL_UNc (r3__, (b), t__); \
UNc_rb_ADD_UNc_rb (r2__, r3__, t__); \
\
(x) = r1__ | (r2__ << G_SHIFT); \
} while (0)
/*
* x_c = (x_c * a_c) / 255
*/
#define UNcx4_MUL_UNcx4(x, a) \
do \
{ \
comp4_t r1__, r2__, r3__, t__; \
\
r1__ = (x); \
r2__ = (a); \
UNc_rb_MUL_UNc_rb (r1__, r2__, t__); \
\
r2__ = (x) >> G_SHIFT; \
r3__ = (a) >> G_SHIFT; \
UNc_rb_MUL_UNc_rb (r2__, r3__, t__); \
\
(x) = r1__ | (r2__ << G_SHIFT); \
} while (0)
/*
* x_c = (x_c * a_c) / 255 + y_c
*/
#define UNcx4_MUL_UNcx4_ADD_UNcx4(x, a, y) \
do \
{ \
comp4_t r1__, r2__, r3__, t__; \
\
r1__ = (x); \
r2__ = (a); \
UNc_rb_MUL_UNc_rb (r1__, r2__, t__); \
r2__ = (y) & RB_MASK; \
UNc_rb_ADD_UNc_rb (r1__, r2__, t__); \
\
r2__ = ((x) >> G_SHIFT); \
r3__ = ((a) >> G_SHIFT); \
UNc_rb_MUL_UNc_rb (r2__, r3__, t__); \
r3__ = ((y) >> G_SHIFT) & RB_MASK; \
UNc_rb_ADD_UNc_rb (r2__, r3__, t__); \
\
(x) = r1__ | (r2__ << G_SHIFT); \
} while (0)
/*
* x_c = (x_c * a_c + y_c * b) / 255
*/
#define UNcx4_MUL_UNcx4_ADD_UNcx4_MUL_UNc(x, a, y, b) \
do \
{ \
comp4_t r1__, r2__, r3__, t__; \
\
r1__ = (x); \
r2__ = (a); \
UNc_rb_MUL_UNc_rb (r1__, r2__, t__); \
r2__ = (y); \
UNc_rb_MUL_UNc (r2__, (b), t__); \
UNc_rb_ADD_UNc_rb (r1__, r2__, t__); \
\
r2__ = (x) >> G_SHIFT; \
r3__ = (a) >> G_SHIFT; \
UNc_rb_MUL_UNc_rb (r2__, r3__, t__); \
r3__ = (y) >> G_SHIFT; \
UNc_rb_MUL_UNc (r3__, (b), t__); \
UNc_rb_ADD_UNc_rb (r2__, r3__, t__); \
\
x = r1__ | (r2__ << G_SHIFT); \
} while (0)
/*
x_c = min(x_c + y_c, 255)
*/
#define UNcx4_ADD_UNcx4(x, y) \
do \
{ \
comp4_t r1__, r2__, r3__, t__; \
\
r1__ = (x) & RB_MASK; \
r2__ = (y) & RB_MASK; \
UNc_rb_ADD_UNc_rb (r1__, r2__, t__); \
\
r2__ = ((x) >> G_SHIFT) & RB_MASK; \
r3__ = ((y) >> G_SHIFT) & RB_MASK; \
UNc_rb_ADD_UNc_rb (r2__, r3__, t__); \
\
x = r1__ | (r2__ << G_SHIFT); \
} while (0)
|
