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42
43#include "precomp.hpp"
44#include "grfmt_hdr.hpp"
45#include "rgbe.hpp"
46
47#ifdef HAVE_IMGCODEC_HDR
48
49namespace cv
50{
51
52HdrDecoder::HdrDecoder()
53{
54 m_signature = "#?RGBE";
55 m_signature_alt = "#?RADIANCE";
56 file = NULL;
57 m_type = CV_32FC3;
58}
59
60HdrDecoder::~HdrDecoder()
61{
62}
63
64size_t HdrDecoder::signatureLength() const
65{
66 return m_signature.size() > m_signature_alt.size() ?
67 m_signature.size() : m_signature_alt.size();
68}
69
70bool HdrDecoder::readHeader()
71{
72 file = fopen(filename: m_filename.c_str(), modes: "rb");
73 if(!file) {
74 return false;
75 }
76 RGBE_ReadHeader(fp: file, width: &m_width, height: &m_height, NULL);
77 if(m_width <= 0 || m_height <= 0) {
78 fclose(stream: file);
79 file = NULL;
80 return false;
81 }
82 return true;
83}
84
85bool HdrDecoder::readData(Mat& _img)
86{
87 Mat img(m_height, m_width, CV_32FC3);
88 if(!file) {
89 if(!readHeader()) {
90 return false;
91 }
92 }
93 RGBE_ReadPixels_RLE(fp: file, data: const_cast<float*>(img.ptr<float>()), scanline_width: img.cols, num_scanlines: img.rows);
94 fclose(stream: file); file = NULL;
95
96 if(_img.depth() == img.depth()) {
97 img.convertTo(m: _img, rtype: _img.type());
98 } else {
99 img.convertTo(m: _img, rtype: _img.type(), alpha: 255);
100 }
101 return true;
102}
103
104bool HdrDecoder::checkSignature( const String& signature ) const
105{
106 if (signature.size() >= m_signature.size() &&
107 0 == memcmp(s1: signature.c_str(), s2: m_signature.c_str(), n: m_signature.size())
108 )
109 return true;
110 if (signature.size() >= m_signature_alt.size() &&
111 0 == memcmp(s1: signature.c_str(), s2: m_signature_alt.c_str(), n: m_signature_alt.size())
112 )
113 return true;
114 return false;
115}
116
117ImageDecoder HdrDecoder::newDecoder() const
118{
119 return makePtr<HdrDecoder>();
120}
121
122HdrEncoder::HdrEncoder()
123{
124 m_description = "Radiance HDR (*.hdr;*.pic)";
125}
126
127HdrEncoder::~HdrEncoder()
128{
129}
130
131bool HdrEncoder::write( const Mat& input_img, const std::vector<int>& params )
132{
133 Mat img;
134 CV_Assert(input_img.channels() == 3 || input_img.channels() == 1);
135 if(input_img.channels() == 1) {
136 std::vector<Mat> splitted(3, input_img);
137 merge(mv: splitted, dst: img);
138 } else {
139 input_img.copyTo(m: img);
140 }
141 if(img.depth() != CV_32F) {
142 img.convertTo(m: img, CV_32FC3, alpha: 1/255.0f);
143 }
144
145 int compression = IMWRITE_HDR_COMPRESSION_RLE;
146 for (size_t i = 0; i + 1 < params.size(); i += 2)
147 {
148 switch (params[i])
149 {
150 case IMWRITE_HDR_COMPRESSION:
151 compression = params[i + 1];
152 break;
153 default:
154 break;
155 }
156 }
157 CV_Check(compression, compression == IMWRITE_HDR_COMPRESSION_NONE || compression == IMWRITE_HDR_COMPRESSION_RLE, "");
158
159 FILE *fout = fopen(filename: m_filename.c_str(), modes: "wb");
160 if(!fout) {
161 return false;
162 }
163
164 RGBE_WriteHeader(fp: fout, width: img.cols, height: img.rows, NULL);
165 if (compression == IMWRITE_HDR_COMPRESSION_RLE) {
166 RGBE_WritePixels_RLE(fp: fout, data: const_cast<float*>(img.ptr<float>()), scanline_width: img.cols, num_scanlines: img.rows);
167 } else {
168 RGBE_WritePixels(fp: fout, data: const_cast<float*>(img.ptr<float>()), numpixels: img.cols * img.rows);
169 }
170
171 fclose(stream: fout);
172 return true;
173}
174
175ImageEncoder HdrEncoder::newEncoder() const
176{
177 return makePtr<HdrEncoder>();
178}
179
180bool HdrEncoder::isFormatSupported( int depth ) const {
181 return depth != CV_64F;
182}
183
184}
185
186#endif // HAVE_IMGCODEC_HDR
187

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source code of opencv/modules/imgcodecs/src/grfmt_hdr.cpp