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
|
#include "pixels.h"
#include <execution>
#include <filesystem>
#include <fstream>
#include <iostream>
Pixels& Pixels::operator+=(
const Pixels& other)
{
std::transform(std::execution::par,
pixels.begin(),
pixels.end(),
other.pixels.begin(),
pixels.begin(),
// [](auto& toAdd) { return dst += src; });
std::plus<>());
return *this;
}
Pixels& Pixels::operator/=(
const float divider)
{
std::for_each(std::execution::par_unseq,
pixels.begin(),
pixels.end(),
[divider](auto& pixel) { pixel /= divider; });
return *this;
}
std::optional<Pixels> Pixels::load(
const QString& filename)
{
const std::filesystem::path filepath{filename.toStdString()};
if (!std::filesystem::exists(filepath)) {
std::cerr << "no such file: " << filepath << std::endl;
return {};
}
std::ifstream ifs(filepath, std::ios::in | std::ios::binary);
if (!ifs)
return {};
Pixels result;
ifs.read(reinterpret_cast<char*>(&result), sizeof(Pixels));
ifs.close();
if (!ifs) {
std::cerr << "cannot read " << filepath << std::endl;
return {};
}
return result;
}
bool Pixels::save(
const QString& filename)
{
const std::filesystem::path filepath{filename.toStdString()};
const auto parent_path = filepath.parent_path();
if (!std::filesystem::exists(parent_path)
&& !std::filesystem::create_directories(parent_path)) {
std::cerr << "cannot create parent directory for file " << filepath
<< std::endl;
return false;
}
std::ofstream ofs(filepath, std::ios::out | std::ios::binary);
if (!ofs)
return false;
ofs.write(reinterpret_cast<const char*>(this), sizeof(Pixels));
ofs.close();
if (!ofs) {
std::cerr << "cannot write " << filepath << std::endl;
return false;
}
return true;
}
Pixels::operator bool() const
{
bool result = std::find_if(pixels.cbegin(),
pixels.cend(),
[](const auto& p) {
return !qFuzzyIsNull(p) && !std::isnan(p);
})
!= pixels.cend();
// std::cout << __func__ << ":\t" << (result ? "true" : "false") << std::endl;
return result;
}
|
