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comparison OrthancFramework/Sources/Images/PamWriter.cpp @ 4044:d25f4c0fa160 framework

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splitting code into OrthancFramework and OrthancServer
author Sebastien Jodogne <s.jodogne@gmail.com>
date Wed, 10 Jun 2020 20:30:34 +0200
parents Core/Images/PamWriter.cpp@94f4a18a79cc
children bf7b9edf6b81
comparison
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4043:6c6239aec462 4044:d25f4c0fa160
1 /**
2 * Orthanc - A Lightweight, RESTful DICOM Store
3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
4 * Department, University Hospital of Liege, Belgium
5 * Copyright (C) 2017-2020 Osimis S.A., Belgium
6 *
7 * This program is free software: you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation, either version 3 of the
10 * License, or (at your option) any later version.
11 *
12 * In addition, as a special exception, the copyright holders of this
13 * program give permission to link the code of its release with the
14 * OpenSSL project's "OpenSSL" library (or with modified versions of it
15 * that use the same license as the "OpenSSL" library), and distribute
16 * the linked executables. You must obey the GNU General Public License
17 * in all respects for all of the code used other than "OpenSSL". If you
18 * modify file(s) with this exception, you may extend this exception to
19 * your version of the file(s), but you are not obligated to do so. If
20 * you do not wish to do so, delete this exception statement from your
21 * version. If you delete this exception statement from all source files
22 * in the program, then also delete it here.
23 *
24 * This program is distributed in the hope that it will be useful, but
25 * WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
27 * General Public License for more details.
28 *
29 * You should have received a copy of the GNU General Public License
30 * along with this program. If not, see <http://www.gnu.org/licenses/>.
31 **/
32
33
34 #include "../PrecompiledHeaders.h"
35 #include "PamWriter.h"
36
37 #include "../Endianness.h"
38 #include "../OrthancException.h"
39 #include "../Toolbox.h"
40
41 #include <boost/lexical_cast.hpp>
42
43
44 namespace Orthanc
45 {
46 static void GetPixelFormatInfo(const PixelFormat& format,
47 unsigned int& maxValue,
48 unsigned int& channelCount,
49 unsigned int& bytesPerChannel,
50 std::string& tupleType)
51 {
52 switch (format)
53 {
54 case PixelFormat_Grayscale8:
55 maxValue = 255;
56 channelCount = 1;
57 bytesPerChannel = 1;
58 tupleType = "GRAYSCALE";
59 break;
60
61 case PixelFormat_SignedGrayscale16:
62 case PixelFormat_Grayscale16:
63 maxValue = 65535;
64 channelCount = 1;
65 bytesPerChannel = 2;
66 tupleType = "GRAYSCALE";
67 break;
68
69 case PixelFormat_RGB24:
70 maxValue = 255;
71 channelCount = 3;
72 bytesPerChannel = 1;
73 tupleType = "RGB";
74 break;
75
76 case PixelFormat_RGB48:
77 maxValue = 255;
78 channelCount = 3;
79 bytesPerChannel = 2;
80 tupleType = "RGB";
81 break;
82
83 default:
84 throw OrthancException(ErrorCode_NotImplemented);
85 }
86 }
87
88
89 void PamWriter::WriteToMemoryInternal(std::string& target,
90 unsigned int width,
91 unsigned int height,
92 unsigned int sourcePitch,
93 PixelFormat format,
94 const void* buffer)
95 {
96 unsigned int maxValue, channelCount, bytesPerChannel;
97 std::string tupleType;
98 GetPixelFormatInfo(format, maxValue, channelCount, bytesPerChannel, tupleType);
99
100 target = (std::string("P7") +
101 std::string("\nWIDTH ") + boost::lexical_cast<std::string>(width) +
102 std::string("\nHEIGHT ") + boost::lexical_cast<std::string>(height) +
103 std::string("\nDEPTH ") + boost::lexical_cast<std::string>(channelCount) +
104 std::string("\nMAXVAL ") + boost::lexical_cast<std::string>(maxValue) +
105 std::string("\nTUPLTYPE ") + tupleType +
106 std::string("\nENDHDR\n"));
107
108 if (bytesPerChannel != 1 &&
109 bytesPerChannel != 2)
110 {
111 throw OrthancException(ErrorCode_NotImplemented);
112 }
113
114 size_t targetPitch = channelCount * bytesPerChannel * width;
115 size_t offset = target.size();
116
117 target.resize(offset + targetPitch * height);
118
119 assert(target.size() != 0);
120
121 if (Toolbox::DetectEndianness() == Endianness_Little &&
122 bytesPerChannel == 2)
123 {
124 // Byte swapping
125 for (unsigned int h = 0; h < height; ++h)
126 {
127 const uint16_t* p = reinterpret_cast<const uint16_t*>
128 (reinterpret_cast<const uint8_t*>(buffer) + h * sourcePitch);
129 uint16_t* q = reinterpret_cast<uint16_t*>
130 (reinterpret_cast<uint8_t*>(&target[offset]) + h * targetPitch);
131
132 for (unsigned int w = 0; w < width * channelCount; ++w)
133 {
134 // memcpy() is necessary to avoid segmentation fault if the
135 // "pixel" pointer is not 16-bit aligned (which is the case
136 // if "offset" is an odd number). Check out issue #99:
137 // https://bitbucket.org/sjodogne/orthanc/issues/99
138 uint16_t v = htobe16(*p);
139 memcpy(q, &v, sizeof(uint16_t));
140
141 p++;
142 q++;
143 }
144 }
145 }
146 else
147 {
148 // Either "bytesPerChannel == 1" (and endianness is not
149 // relevant), or we run on a big endian architecture (and no
150 // byte swapping is necessary, as PAM uses big endian)
151
152 for (unsigned int h = 0; h < height; ++h)
153 {
154 const void* p = reinterpret_cast<const uint8_t*>(buffer) + h * sourcePitch;
155 void* q = reinterpret_cast<uint8_t*>(&target[offset]) + h * targetPitch;
156 memcpy(q, p, targetPitch);
157 }
158 }
159 }
160 }