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
|
/*
* Gamma Correction Plugin (RGB Version) 0.01
*
* Copyright (c) 2005 Peter Schlaile
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include "math.h"
#include "plugin.h"
#include "util.h"
#include <stdio.h>
#define alpha_epsilon 0.0001f
char name[]= "Gamma Correction";
VarStruct varstr[]= {
{ NUMSLI|FLO, "St M:", 0.0, -1.0, 1.0, "Setup Main"},
{ NUMSLI|FLO, "Gn M:", 1.0, 0.0, 10.0,"Gain Main"},
{ NUMSLI|FLO, "Ga M:", 1.0, 0.0, 10.0, "Gamma Main"},
{ NUMSLI|FLO, "St R:", 0.0, -1.0, 1.0, "Setup Red"},
{ NUMSLI|FLO, "Gn R:", 1.0, 0.0, 10.0,"Gain Red"},
{ NUMSLI|FLO, "Ga R:", 1.0, 0.0, 10.0, "Gamma Red"},
{ NUMSLI|FLO, "St G:", 0.0, -1.0, 1.0, "Setup Green"},
{ NUMSLI|FLO, "Gn G:", 1.0, 0.0, 10.0,"Gain Green"},
{ NUMSLI|FLO, "Ga G:", 1.0, 0.0, 10.0, "Gamma Green"},
{ NUMSLI|FLO, "St B:", 0.0, -1.0, 1.0, "Setup Blue"},
{ NUMSLI|FLO, "Gn B:", 1.0, 0.0, 10.0,"Gain Blue"},
{ NUMSLI|FLO, "Ga B:", 1.0, 0.0, 10.0, "Gamma Blue"},
};
typedef struct Cast {
float setup_m;
float gain_m;
float gamma_m;
float setup_r;
float gain_r;
float gamma_r;
float setup_g;
float gain_g;
float gamma_g;
float setup_b;
float gain_b;
float gamma_b;
} Cast;
float cfra;
void plugin_seq_doit(Cast *, float, float, int, int, ImBuf *, ImBuf *, ImBuf *, ImBuf *);
int plugin_seq_getversion(void) { return B_PLUGIN_VERSION; }
void plugin_but_changed(int but) {}
void plugin_init() {}
void plugin_getinfo(PluginInfo *info) {
info->name= name;
info->nvars= sizeof(varstr)/sizeof(VarStruct);
info->cfra= &cfra;
info->varstr= varstr;
info->init= plugin_init;
info->seq_doit= (SeqDoit) plugin_seq_doit;
info->callback= plugin_but_changed;
}
static void make_gamma_table(float setup, float gain, float gamma,
unsigned char * table)
{
int y;
for (y = 0; y < 256; y++) {
float v = 1.0 * y / 255;
v += setup;
v *= gain;
v = pow(v, gamma);
if ( v > 1.0) {
v = 1.0;
} else if (v < 0.0) {
v = 0.0;
}
table[y] = v * 255;
}
}
void plugin_seq_doit(Cast *cast, float facf0, float facf1, int width,
int height, ImBuf *ibuf1, ImBuf *ibuf2, ImBuf *out, ImBuf *use) {
if (!out->rect_float)
{
unsigned char *dest, *src1, *src2;
int x, y, c;
unsigned char gamma_table_m[256];
unsigned char gamma_table_r[256];
unsigned char gamma_table_g[256];
unsigned char gamma_table_b[256];
if (!ibuf1) return;
dest= (unsigned char *) out->rect;
src1= (unsigned char *) ibuf1->rect;
make_gamma_table(cast->setup_m, cast->gain_m, cast->gamma_m,
gamma_table_m);
make_gamma_table(cast->setup_r, cast->gain_r, cast->gamma_r,
gamma_table_r);
make_gamma_table(cast->setup_g, cast->gain_g, cast->gamma_g,
gamma_table_g);
make_gamma_table(cast->setup_b, cast->gain_b, cast->gamma_b,
gamma_table_b);
for (y = 0; y < height; y++) {
for (x = 0; x < width; x++) {
*dest++ = gamma_table_r[gamma_table_m[*src1++]];
*dest++ = gamma_table_g[gamma_table_m[*src1++]];
*dest++ = gamma_table_b[gamma_table_m[*src1++]];
dest++; src1++;
}
}
}
else
{
float *i=ibuf1->rect_float;
float *o=out->rect_float;
unsigned int size=width*height;
unsigned int k;
float val_r[3]={cast->setup_r,cast->gain_r,cast->gamma_r};
float val_g[3]={cast->setup_g,cast->gain_g,cast->gamma_g};
float val_b[3]={cast->setup_b,cast->gain_b,cast->gamma_b};
float *vals[3]={val_r,val_g,val_b};
for (k=0;k<size;++k)
{
if (cast->gamma_m!=1.f || cast->setup_m!=0.f || cast->gain_m!=1.f)
{
float alpha=CLAMP(i[3],0.f,1.f);
if (alpha>alpha_epsilon) {
int l;
for (l=0;l<3;++l)
{
float *val=vals[l];
o[l]=i[l]/alpha;
o[l]=pow((o[l]+cast->setup_m)*cast->gain_m,cast->gamma_m);
if (val[2]!=1.f || val[0]!=0.f || val[1]!=1.f)
{
o[l]=pow((o[l]+val[0])*val[1],val[2]);
}
o[l]*=alpha;
o[l]=CLAMP(o[l],0.f,1.f);
}
} else {
o[0]=o[1]=o[2]=0.0;
}
o[3]=1.0;
}
else
{
int l;
for (l=0;l<3;++l)
o[l]=CLAMP(i[l],0.f,1.f);
o[3]=1.0;
}
i+=4;
o+=4;
}
}
}
|
