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comparison Core/Images/Font.cpp @ 1612:96582230ddcb

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Core/ImageFormats folder renamed as Core/Images
author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 04 Sep 2015 16:36:18 +0200
parents Core/ImageFormats/Font.cpp@5e9b2aac8b89
children 644c32c07306
comparison
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1611:5e9b2aac8b89 1612:96582230ddcb
1 /**
2 * Orthanc - A Lightweight, RESTful DICOM Store
3 * Copyright (C) 2012-2015 Sebastien Jodogne, Medical Physics
4 * Department, University Hospital of Liege, Belgium
5 *
6 * This program is free software: you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation, either version 3 of the
9 * License, or (at your option) any later version.
10 *
11 * In addition, as a special exception, the copyright holders of this
12 * program give permission to link the code of its release with the
13 * OpenSSL project's "OpenSSL" library (or with modified versions of it
14 * that use the same license as the "OpenSSL" library), and distribute
15 * the linked executables. You must obey the GNU General Public License
16 * in all respects for all of the code used other than "OpenSSL". If you
17 * modify file(s) with this exception, you may extend this exception to
18 * your version of the file(s), but you are not obligated to do so. If
19 * you do not wish to do so, delete this exception statement from your
20 * version. If you delete this exception statement from all source files
21 * in the program, then also delete it here.
22 *
23 * This program is distributed in the hope that it will be useful, but
24 * WITHOUT ANY WARRANTY; without even the implied warranty of
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
26 * General Public License for more details.
27 *
28 * You should have received a copy of the GNU General Public License
29 * along with this program. If not, see <http://www.gnu.org/licenses/>.
30 **/
31
32
33 #include "../PrecompiledHeaders.h"
34 #include "Font.h"
35
36 #include "../Toolbox.h"
37 #include "../OrthancException.h"
38
39 #include <stdio.h>
40 #include <memory>
41 #include <boost/lexical_cast.hpp>
42
43 namespace Orthanc
44 {
45 Font::~Font()
46 {
47 for (Characters::iterator it = characters_.begin();
48 it != characters_.end(); it++)
49 {
50 delete it->second;
51 }
52 }
53
54
55 void Font::LoadFromMemory(const std::string& font)
56 {
57 Json::Value v;
58 Json::Reader reader;
59 if (!reader.parse(font, v) ||
60 v.type() != Json::objectValue ||
61 !v.isMember("Name") ||
62 !v.isMember("Size") ||
63 !v.isMember("Characters") ||
64 v["Name"].type() != Json::stringValue ||
65 v["Size"].type() != Json::intValue ||
66 v["Characters"].type() != Json::objectValue)
67 {
68 throw OrthancException(ErrorCode_BadFont);
69 }
70
71 name_ = v["Name"].asString();
72 size_ = v["Size"].asUInt();
73 maxHeight_ = 0;
74
75 Json::Value::Members characters = v["Characters"].getMemberNames();
76
77 for (size_t i = 0; i < characters.size(); i++)
78 {
79 const Json::Value& info = v["Characters"][characters[i]];
80 if (info.type() != Json::objectValue ||
81 !info.isMember("Advance") ||
82 !info.isMember("Bitmap") ||
83 !info.isMember("Height") ||
84 !info.isMember("Top") ||
85 !info.isMember("Width") ||
86 info["Advance"].type() != Json::intValue ||
87 info["Bitmap"].type() != Json::arrayValue ||
88 info["Height"].type() != Json::intValue ||
89 info["Top"].type() != Json::intValue ||
90 info["Width"].type() != Json::intValue)
91 {
92 throw OrthancException(ErrorCode_BadFont);
93 }
94
95 std::auto_ptr<Character> c(new Character);
96
97 c->advance_ = info["Advance"].asUInt();
98 c->height_ = info["Height"].asUInt();
99 c->top_ = info["Top"].asUInt();
100 c->width_ = info["Width"].asUInt();
101 c->bitmap_.resize(info["Bitmap"].size());
102
103 if (c->height_ > maxHeight_)
104 {
105 maxHeight_ = c->height_;
106 }
107
108 for (Json::Value::ArrayIndex j = 0; j < info["Bitmap"].size(); j++)
109 {
110 if (info["Bitmap"][j].type() != Json::intValue)
111 {
112 throw OrthancException(ErrorCode_BadFont);
113 }
114
115 int value = info["Bitmap"][j].asInt();
116 if (value < 0 || value > 255)
117 {
118 throw OrthancException(ErrorCode_BadFont);
119 }
120
121 c->bitmap_[j] = value;
122 }
123
124 int index = boost::lexical_cast<int>(characters[i]);
125 if (index < 0 || index > 255)
126 {
127 throw OrthancException(ErrorCode_BadFont);
128 }
129
130 characters_[static_cast<char>(index)] = c.release();
131 }
132 }
133
134
135 void Font::LoadFromFile(const std::string& path)
136 {
137 std::string font;
138 Toolbox::ReadFile(font, path);
139 LoadFromMemory(font);
140 }
141
142
143 static unsigned int MyMin(unsigned int a,
144 unsigned int b)
145 {
146 return a < b ? a : b;
147 }
148
149
150 void Font::DrawCharacter(ImageAccessor& target,
151 const Character& character,
152 int x,
153 int y,
154 const uint8_t color[4]) const
155 {
156 // Compute the bounds of the character
157 if (x >= static_cast<int>(target.GetWidth()) ||
158 y >= static_cast<int>(target.GetHeight()))
159 {
160 // The character is out of the image
161 return;
162 }
163
164 unsigned int left = x < 0 ? -x : 0;
165 unsigned int top = y < 0 ? -y : 0;
166 unsigned int width = MyMin(character.width_, target.GetWidth() - x);
167 unsigned int height = MyMin(character.height_, target.GetHeight() - y);
168
169 uint8_t bpp = target.GetBytesPerPixel();
170
171 // Blit the font bitmap OVER the target image
172 // https://en.wikipedia.org/wiki/Alpha_compositing
173
174 for (unsigned int cy = top; cy < height; cy++)
175 {
176 uint8_t* p = reinterpret_cast<uint8_t*>(target.GetRow(y + cy)) + (x + left) * bpp;
177 unsigned int pos = cy * character.width_ + left;
178
179 switch (target.GetFormat())
180 {
181 case PixelFormat_Grayscale8:
182 {
183 assert(bpp == 1);
184 for (unsigned int cx = left; cx < width; cx++, pos++, p++)
185 {
186 uint16_t alpha = character.bitmap_[pos];
187 *p = (alpha * static_cast<uint16_t>(color[0]) + (255 - alpha) * static_cast<uint16_t>(*p)) >> 8;
188 }
189
190 break;
191 }
192
193 case PixelFormat_RGB24:
194 {
195 assert(bpp == 3);
196 for (unsigned int cx = left; cx < width; cx++, pos++, p += 3)
197 {
198 uint16_t alpha = character.bitmap_[pos];
199 p[0] = (alpha * static_cast<uint16_t>(color[0]) + (255 - alpha) * static_cast<uint16_t>(p[0])) >> 8;
200 p[1] = (alpha * static_cast<uint16_t>(color[1]) + (255 - alpha) * static_cast<uint16_t>(p[1])) >> 8;
201 p[2] = (alpha * static_cast<uint16_t>(color[2]) + (255 - alpha) * static_cast<uint16_t>(p[2])) >> 8;
202 }
203
204 break;
205 }
206
207 case PixelFormat_RGBA32:
208 {
209 assert(bpp == 4);
210
211 for (unsigned int cx = left; cx < width; cx++, pos++, p += 4)
212 {
213 float alpha = static_cast<float>(character.bitmap_[pos]) / 255.0f;
214 float beta = (1.0f - alpha) * static_cast<float>(p[3]) / 255.0f;
215 float denom = 1.0f / (alpha + beta);
216
217 for (uint8_t i = 0; i < 3; i++)
218 {
219 p[i] = static_cast<uint8_t>((alpha * static_cast<float>(color[i]) +
220 beta * static_cast<float>(p[i])) * denom);
221 }
222
223 p[3] = static_cast<uint8_t>(255.0f * (alpha + beta));
224 }
225
226 break;
227 }
228
229 default:
230 throw OrthancException(ErrorCode_NotImplemented);
231 }
232 }
233
234 }
235
236
237 void Font::DrawInternal(ImageAccessor& target,
238 const std::string& utf8,
239 int x,
240 int y,
241 const uint8_t color[4]) const
242 {
243 if (target.GetFormat() != PixelFormat_Grayscale8 &&
244 target.GetFormat() != PixelFormat_RGB24 &&
245 target.GetFormat() != PixelFormat_RGBA32)
246 {
247 throw OrthancException(ErrorCode_NotImplemented);
248 }
249
250 int a = x;
251
252 std::string s = Toolbox::ConvertFromUtf8(utf8, Encoding_Latin1);
253
254 for (size_t i = 0; i < s.size(); i++)
255 {
256 if (s[i] == '\n')
257 {
258 // Go to the next line
259 a = x;
260 y += maxHeight_ + 1;
261 }
262 else
263 {
264 Characters::const_iterator c = characters_.find(s[i]);
265 if (c != characters_.end())
266 {
267 DrawCharacter(target, *c->second, a, y + static_cast<int>(c->second->top_), color);
268 a += c->second->advance_;
269 }
270 }
271 }
272 }
273
274
275 void Font::Draw(ImageAccessor& target,
276 const std::string& utf8,
277 int x,
278 int y,
279 uint8_t grayscale) const
280 {
281 uint8_t color[4] = { grayscale, grayscale, grayscale, 255 };
282 DrawInternal(target, utf8, x, y, color);
283 }
284
285
286 void Font::Draw(ImageAccessor& target,
287 const std::string& utf8,
288 int x,
289 int y,
290 uint8_t r,
291 uint8_t g,
292 uint8_t b) const
293 {
294 uint8_t color[4] = { r, g, b, 255 };
295 DrawInternal(target, utf8, x, y, color);
296 }
297
298 }