Repository navigation
Expand file tree
/
Copy pathwrite.rs
More file actions
347 lines (332 loc) · 11.6 KB
/
Copy pathwrite.rs
File metadata and controls
347 lines (332 loc) · 11.6 KB
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
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
//! ICC v4.3 profile writer (ICC.1:2010), used for built-in and synthetic profiles.
use crate::clut::Clut;
use crate::curve::Curve;
use crate::math;
use crate::pipeline::Stage;
use crate::profile::{LutKind, Pcs, Profile};
fn s15(v: f64) -> [u8; 4] {
((v * 65536.0).round() as i32).to_be_bytes()
}
fn xyz_type(v: [f64; 3]) -> Vec<u8> {
let mut o = b"XYZ \0\0\0\0".to_vec();
for c in v {
o.extend_from_slice(&s15(c));
}
o
}
fn mluc(text: &str) -> Vec<u8> {
let units: Vec<u16> = text.encode_utf16().collect();
let mut o = b"mluc\0\0\0\0".to_vec();
o.extend_from_slice(&1u32.to_be_bytes());
o.extend_from_slice(&12u32.to_be_bytes());
o.extend_from_slice(b"enUS");
o.extend_from_slice(&((units.len() * 2) as u32).to_be_bytes());
o.extend_from_slice(&28u32.to_be_bytes());
for u in units {
o.extend_from_slice(&u.to_be_bytes());
}
o
}
fn u16q(v: f32) -> u16 {
(v.clamp(0.0, 1.0) * 65535.0 + 0.5) as u16
}
/// `curv` or `para` element for a curve.
fn curve_elem(c: &Curve) -> Vec<u8> {
match c {
Curve::Identity => {
let mut o = b"curv\0\0\0\0".to_vec();
o.extend_from_slice(&0u32.to_be_bytes());
o
}
Curve::Gamma(g) => {
let mut o = b"para\0\0\0\0".to_vec();
o.extend_from_slice(&[0, 0, 0, 0]);
o.extend_from_slice(&s15(*g));
o
}
Curve::Parametric { kind, p } => {
let mut o = b"para\0\0\0\0".to_vec();
o.extend_from_slice(&kind.to_be_bytes());
o.extend_from_slice(&[0, 0]);
for v in p.iter().take(Curve::param_count(*kind)) {
o.extend_from_slice(&s15(*v));
}
o
}
Curve::Table(t) => {
let mut o = b"curv\0\0\0\0".to_vec();
o.extend_from_slice(&(t.len() as u32).to_be_bytes());
for v in t {
o.extend_from_slice(&u16q(*v).to_be_bytes());
}
o
}
}
}
fn pad4(v: &mut Vec<u8>) {
while !v.len().is_multiple_of(4) {
v.push(0);
}
}
fn curve_table(c: &Curve, n: usize) -> Vec<f32> {
match c {
Curve::Table(t) if t.len() == n => t.clone(),
_ => c.sample(n),
}
}
fn table_len(cs: &[Curve]) -> usize {
cs.iter()
.map(|c| match c {
Curve::Table(t) => t.len(),
Curve::Identity => 2,
_ => 1024,
})
.max()
.unwrap_or(2)
.clamp(2, 4096)
}
/// Splits a LUT's stages into `(matrix, input curves, clut, output curves)` for `mft1`/`mft2`.
type LutParts<'a> = (Option<Vec<f64>>, &'a [Curve], &'a Clut, &'a [Curve]);
fn lut_parts(stages: &[Stage]) -> Option<LutParts<'_>> {
let mut i = 0;
let mut mat = None;
if let Some(Stage::Matrix { rows: 3, cols: 3, m, .. }) = stages.first() {
mat = Some(m.clone());
i = 1;
}
match &stages[i..] {
[Stage::Curves(a), Stage::Clut(c), Stage::Curves(b)] => Some((mat, a, c, b)),
_ => None,
}
}
/// `None` unless the stages are `[matrix?] curves, clut, curves` with a uniform grid.
fn encode_mft(stages: &[Stage], wide: bool) -> Option<Vec<u8>> {
let (mat, a, clut, b) = lut_parts(stages)?;
let g = *clut.grid.first()?;
if !clut.grid.iter().all(|x| *x == g) {
return None;
}
let mut o = if wide { b"mft2\0\0\0\0".to_vec() } else { b"mft1\0\0\0\0".to_vec() };
o.extend_from_slice(&[clut.inputs as u8, clut.outputs as u8, g as u8, 0]);
let m = mat.unwrap_or_else(|| vec![1.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 1.0]);
for v in &m {
o.extend_from_slice(&s15(*v));
}
let (n_in, n_out) = if wide { (table_len(a), table_len(b)) } else { (256, 256) };
if wide {
o.extend_from_slice(&(n_in as u16).to_be_bytes());
o.extend_from_slice(&(n_out as u16).to_be_bytes());
}
let put = |o: &mut Vec<u8>, v: f32| {
if wide {
o.extend_from_slice(&u16q(v).to_be_bytes());
} else {
o.push((v.clamp(0.0, 1.0) * 255.0 + 0.5) as u8);
}
};
for c in a {
for v in curve_table(c, n_in) {
put(&mut o, v);
}
}
for v in &clut.data {
put(&mut o, *v);
}
for c in b {
for v in curve_table(c, n_out) {
put(&mut o, v);
}
}
Some(o)
}
/// `None` when the stages aren't a layout `lutAtoB`/`lutBtoA` can store in this direction.
fn encode_ab(stages: &[Stage], a2b: bool, inputs: usize, outputs: usize) -> Option<Vec<u8>> {
let mut a_curves: Option<&[Curve]> = None;
let mut clut: Option<&Clut> = None;
let mut m_curves: Option<&[Curve]> = None;
let mut matrix: Option<(&Vec<f64>, &Vec<f64>)> = None;
let mut b_curves: Option<&[Curve]> = None;
let mut it = stages.iter().peekable();
if a2b {
// [A, CLUT] [M, matrix] B
if let (Some(Stage::Curves(a)), Some(Stage::Clut(_))) = (stages.first(), stages.get(1)) {
a_curves = Some(a);
it.next();
if let Some(Stage::Clut(c)) = it.next() {
clut = Some(c);
}
}
let rest: Vec<&Stage> = it.collect();
match rest.as_slice() {
[Stage::Curves(m), Stage::Matrix { m: mm, offset, .. }, Stage::Curves(b)] => {
m_curves = Some(m.as_slice());
matrix = Some((mm, offset));
b_curves = Some(b.as_slice());
}
[Stage::Curves(b)] => b_curves = Some(b.as_slice()),
_ => return None,
}
} else {
// B [matrix, M] [CLUT, A]
let v: Vec<&Stage> = it.collect();
let mut k = 0;
if let Some(Stage::Curves(b)) = v.first() {
b_curves = Some(b.as_slice());
k = 1;
}
if let (Some(Stage::Matrix { m: mm, offset, .. }), Some(Stage::Curves(m))) = (v.get(k), v.get(k + 1)) {
matrix = Some((mm, offset));
m_curves = Some(m.as_slice());
k += 2;
}
if let (Some(Stage::Clut(c)), Some(Stage::Curves(a))) = (v.get(k), v.get(k + 1)) {
clut = Some(c);
a_curves = Some(a.as_slice());
k += 2;
}
if k != v.len() {
return None;
}
}
let mut o = if a2b { b"mAB \0\0\0\0".to_vec() } else { b"mBA \0\0\0\0".to_vec() };
o.extend_from_slice(&[inputs as u8, outputs as u8, 0, 0]);
o.extend_from_slice(&[0u8; 20]); // offsets, patched below
let mut offs = [0u32; 5]; // B, matrix, M, CLUT, A
let curves = |o: &mut Vec<u8>, cs: &[Curve]| {
for c in cs {
o.extend_from_slice(&curve_elem(c));
pad4(o);
}
};
let b = b_curves?;
offs[0] = o.len() as u32;
curves(&mut o, b);
if let Some((mm, off)) = matrix {
offs[1] = o.len() as u32;
for v in mm.iter() {
o.extend_from_slice(&s15(*v));
}
for v in off.iter() {
o.extend_from_slice(&s15(*v));
}
offs[2] = o.len() as u32;
curves(&mut o, m_curves?);
}
if let Some(c) = clut {
offs[3] = o.len() as u32;
let mut g = [0u8; 16];
for (k, n) in c.grid.iter().enumerate() {
g[k] = *n as u8;
}
o.extend_from_slice(&g);
o.extend_from_slice(&[2, 0, 0, 0]);
for v in &c.data {
o.extend_from_slice(&u16q(*v).to_be_bytes());
}
pad4(&mut o);
offs[4] = o.len() as u32;
curves(&mut o, a_curves?);
}
for (k, v) in offs.iter().enumerate() {
o[12 + k * 4..16 + k * 4].copy_from_slice(&v.to_be_bytes());
}
Some(o)
}
/// Encodes `p` as ICC v4.3 bytes (identical tag data is shared between tags). A LUT whose
/// stage layout its tag type can't store (only possible for a parsed profile whose LUT tag
/// used the other direction's type) is left out; the matrix/TRC tags still describe it.
pub fn encode(p: &Profile) -> Vec<u8> {
let mut tags: Vec<([u8; 4], Vec<u8>)> = Vec::new();
tags.push((*b"desc", mluc(&p.description)));
tags.push((*b"cprt", mluc(&p.copyright)));
tags.push((*b"wtpt", xyz_type(p.white_point)));
if let Some(bk) = p.black_point {
tags.push((*b"bkpt", xyz_type(bk)));
}
if let Some(c) = &p.chad {
let mut o = b"sf32\0\0\0\0".to_vec();
for v in c.iter().flatten() {
o.extend_from_slice(&s15(*v));
}
tags.push((*b"chad", o));
}
if let Some(m) = &p.matrix {
tags.push((*b"rXYZ", xyz_type([m[0][0], m[1][0], m[2][0]])));
tags.push((*b"gXYZ", xyz_type([m[0][1], m[1][1], m[2][1]])));
tags.push((*b"bXYZ", xyz_type([m[0][2], m[1][2], m[2][2]])));
}
if let Some([r, g, b]) = &p.trc {
tags.push((*b"rTRC", curve_elem(r)));
tags.push((*b"gTRC", curve_elem(g)));
tags.push((*b"bTRC", curve_elem(b)));
}
if let Some(k) = &p.gray_trc {
tags.push((*b"kTRC", curve_elem(k)));
}
for (luts, names, a2b) in [(&p.a2b, [b"A2B0", b"A2B1", b"A2B2"], true), (&p.b2a, [b"B2A0", b"B2A1", b"B2A2"], false)] {
for (l, name) in luts.iter().zip(names) {
if let Some(l) = l {
let data = match l.kind {
LutKind::Lut16 => encode_mft(&l.stages, true),
LutKind::Lut8 => encode_mft(&l.stages, false),
LutKind::Ab => encode_ab(&l.stages, a2b, l.inputs, l.outputs),
};
if let Some(data) = data {
tags.push((*name, data));
}
}
}
}
// Layout: header, tag table, then data (identical payloads share one copy).
let table_len = 4 + tags.len() * 12;
let mut data: Vec<u8> = Vec::new();
let mut entries: Vec<([u8; 4], u32, u32)> = Vec::new();
let mut placed: Vec<(usize, u32, u32)> = Vec::new(); // (tag index, offset, len)
for (i, (sig, d)) in tags.iter().enumerate() {
if let Some((_, off, len)) = placed.iter().find(|(j, _, _)| tags[*j].1 == *d) {
entries.push((*sig, *off, *len));
continue;
}
let off = (128 + table_len + data.len()) as u32;
data.extend_from_slice(d);
pad4(&mut data);
entries.push((*sig, off, d.len() as u32));
placed.push((i, off, d.len() as u32));
}
let size = 128 + table_len + data.len();
let mut o = Vec::with_capacity(size);
o.extend_from_slice(&(size as u32).to_be_bytes());
o.extend_from_slice(&[0, 0, 0, 0]); // preferred CMM
o.extend_from_slice(&[4, 0x30, 0, 0]); // version 4.3
o.extend_from_slice(&p.class.sig().to_be_bytes());
o.extend_from_slice(&p.color_space.sig().to_be_bytes());
o.extend_from_slice(match p.pcs {
Pcs::Xyz => b"XYZ ",
Pcs::Lab => b"Lab ",
});
for v in [2026u16, 1, 1, 0, 0, 0] {
o.extend_from_slice(&v.to_be_bytes());
}
o.extend_from_slice(b"acsp");
o.extend_from_slice(&[0; 4]); // platform
o.extend_from_slice(&[0; 4]); // flags
o.extend_from_slice(&[0; 4]); // manufacturer
o.extend_from_slice(&[0; 4]); // model
o.extend_from_slice(&[0; 8]); // attributes
o.extend_from_slice(&(p.rendering_intent as u32).to_be_bytes());
for v in math::D50 {
o.extend_from_slice(&s15(v));
}
o.extend_from_slice(&[0; 4]); // creator
o.extend_from_slice(&[0; 16]); // profile id (not computed)
o.resize(128, 0);
o.extend_from_slice(&(entries.len() as u32).to_be_bytes());
for (sig, off, len) in &entries {
o.extend_from_slice(sig);
o.extend_from_slice(&off.to_be_bytes());
o.extend_from_slice(&len.to_be_bytes());
}
o.extend_from_slice(&data);
debug_assert_eq!(o.len(), size);
o
}