File size: 4,961 Bytes
be903e2 | 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 | // Tencent is pleased to support the open source community by making ncnn available.
//
// Copyright (C) 2021 THL A29 Limited, a Tencent company. All rights reserved.
//
// Licensed under the BSD 3-Clause License (the "License"); you may not use this file except
// in compliance with the License. You may obtain a copy of the License at
//
// https://opensource.org/licenses/BSD-3-Clause
//
// Unless required by applicable law or agreed to in writing, software distributed
// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
// CONDITIONS OF ANY KIND, either express or implied. See the License for the
// specific language governing permissions and limitations under the License.
#include "imreadwrite.h"
#include <stdio.h>
#define STB_IMAGE_IMPLEMENTATION
#define STBI_NO_THREAD_LOCALS
#define STBI_ONLY_JPEG
#define STBI_ONLY_PNG
#define STBI_ONLY_BMP
#define STBI_ONLY_PNM
#include "../../src/stb_image.h"
#define STB_IMAGE_WRITE_IMPLEMENTATION
#include "../../src/stb_image_write.h"
namespace cv {
Mat imread(const std::string& path, int flags)
{
int desired_channels = 0;
if (flags == IMREAD_UNCHANGED)
{
desired_channels = 0;
}
else if (flags == IMREAD_GRAYSCALE)
{
desired_channels = 1;
}
else if (flags == IMREAD_COLOR)
{
desired_channels = 3;
}
else
{
// unknown flags
return Mat();
}
int w;
int h;
int c;
unsigned char* pixeldata = stbi_load(path.c_str(), &w, &h, &c, desired_channels);
if (!pixeldata)
{
// load failed
return Mat();
}
if (desired_channels)
{
c = desired_channels;
}
// copy pixeldata to Mat
Mat img;
if (c == 1)
{
img.create(h, w, CV_8UC1);
}
else if (c == 3)
{
img.create(h, w, CV_8UC3);
}
else if (c == 4)
{
img.create(h, w, CV_8UC4);
}
else
{
// unexpected channels
stbi_image_free(pixeldata);
return Mat();
}
memcpy(img.data, pixeldata, static_cast<size_t>(w) * static_cast<size_t>(h) * static_cast<size_t>(c));
stbi_image_free(pixeldata);
// // resolve exif orientation
// {
// std::ifstream ifs;
// ifs.open(filename.c_str(), std::ifstream::in);
//
// if (ifs.good())
// {
// ExifReader exif_reader(ifs);
// if (exif_reader.parse())
// {
// ExifEntry_t e = exif_reader.getTag(ORIENTATION);
// int orientation = e.field_u16;
// if (orientation >= 1 && orientation <= 8)
// rotate_by_orientation(img, img, orientation);
// }
// }
//
// ifs.close();
// }
// rgb to bgr
if (c == 3)
{
uchar* p = img.data;
for (int i = 0; i < w * h; i++)
{
std::swap(p[0], p[2]);
p += 3;
}
}
if (c == 4)
{
uchar* p = img.data;
for (int i = 0; i < w * h; i++)
{
std::swap(p[0], p[2]);
p += 4;
}
}
return img;
}
bool imwrite(const std::string& path, const Mat& m, const std::vector<int>& params)
{
const char* _ext = strrchr(path.c_str(), '.');
if (!_ext)
{
// missing extension
return false;
}
std::string ext = _ext;
Mat img = m.clone();
// bgr to rgb
int c = 0;
if (img.type() == CV_8UC1)
{
c = 1;
}
else if (img.type() == CV_8UC3)
{
c = 3;
uchar* p = img.data;
for (int i = 0; i < img.cols * img.rows; i++)
{
std::swap(p[0], p[2]);
p += 3;
}
}
else if (img.type() == CV_8UC4)
{
c = 4;
uchar* p = img.data;
for (int i = 0; i < img.cols * img.rows; i++)
{
std::swap(p[0], p[2]);
p += 4;
}
}
else
{
// unexpected image channels
return false;
}
bool success = false;
if (ext == ".jpg" || ext == ".jpeg" || ext == ".JPG" || ext == ".JPEG")
{
int quality = 95;
for (size_t i = 0; i < params.size(); i += 2)
{
if (params[i] == IMWRITE_JPEG_QUALITY)
{
quality = params[i + 1];
break;
}
}
success = stbi_write_jpg(path.c_str(), img.cols, img.rows, c, img.data, quality);
}
else if (ext == ".png" || ext == ".PNG")
{
success = stbi_write_png(path.c_str(), img.cols, img.rows, c, img.data, 0);
}
else if (ext == ".bmp" || ext == ".BMP")
{
success = stbi_write_bmp(path.c_str(), img.cols, img.rows, c, img.data);
}
else
{
// unknown extension type
return false;
}
return success;
}
} // namespace cv
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