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comparison OrthancFramework/Sources/Images/Font.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/Font.cpp@058b5ade8acd
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 "Font.h"
36
37 #if !defined(ORTHANC_ENABLE_LOCALE)
38 # error ORTHANC_ENABLE_LOCALE must be defined to use this file
39 #endif
40
41 #if ORTHANC_SANDBOXED == 0
42 # include "../SystemToolbox.h"
43 #endif
44
45 #include "../OrthancException.h"
46 #include "../Toolbox.h"
47 #include "Image.h"
48 #include "ImageProcessing.h"
49
50 #include <stdio.h>
51 #include <memory>
52 #include <boost/lexical_cast.hpp>
53
54 namespace Orthanc
55 {
56 Font::~Font()
57 {
58 for (Characters::iterator it = characters_.begin();
59 it != characters_.end(); ++it)
60 {
61 delete it->second;
62 }
63 }
64
65
66 void Font::LoadFromMemory(const std::string& font)
67 {
68 Json::Value v;
69 Json::Reader reader;
70 if (!reader.parse(font, v) ||
71 v.type() != Json::objectValue ||
72 !v.isMember("Name") ||
73 !v.isMember("Size") ||
74 !v.isMember("Characters") ||
75 v["Name"].type() != Json::stringValue ||
76 v["Size"].type() != Json::intValue ||
77 v["Characters"].type() != Json::objectValue)
78 {
79 throw OrthancException(ErrorCode_BadFont);
80 }
81
82 name_ = v["Name"].asString();
83 size_ = v["Size"].asUInt();
84 maxHeight_ = 0;
85
86 Json::Value::Members characters = v["Characters"].getMemberNames();
87
88 for (size_t i = 0; i < characters.size(); i++)
89 {
90 const Json::Value& info = v["Characters"][characters[i]];
91 if (info.type() != Json::objectValue ||
92 !info.isMember("Advance") ||
93 !info.isMember("Bitmap") ||
94 !info.isMember("Height") ||
95 !info.isMember("Top") ||
96 !info.isMember("Width") ||
97 info["Advance"].type() != Json::intValue ||
98 info["Bitmap"].type() != Json::arrayValue ||
99 info["Height"].type() != Json::intValue ||
100 info["Top"].type() != Json::intValue ||
101 info["Width"].type() != Json::intValue)
102 {
103 throw OrthancException(ErrorCode_BadFont);
104 }
105
106 std::unique_ptr<Character> c(new Character);
107
108 c->advance_ = info["Advance"].asUInt();
109 c->height_ = info["Height"].asUInt();
110 c->top_ = info["Top"].asUInt();
111 c->width_ = info["Width"].asUInt();
112 c->bitmap_.resize(info["Bitmap"].size());
113
114 if (c->height_ > maxHeight_)
115 {
116 maxHeight_ = c->height_;
117 }
118
119 for (Json::Value::ArrayIndex j = 0; j < info["Bitmap"].size(); j++)
120 {
121 if (info["Bitmap"][j].type() != Json::intValue)
122 {
123 throw OrthancException(ErrorCode_BadFont);
124 }
125
126 int value = info["Bitmap"][j].asInt();
127 if (value < 0 || value > 255)
128 {
129 throw OrthancException(ErrorCode_BadFont);
130 }
131
132 c->bitmap_[j] = static_cast<uint8_t>(value);
133 }
134
135 int index = boost::lexical_cast<int>(characters[i]);
136 if (index < 0 || index > 255)
137 {
138 throw OrthancException(ErrorCode_BadFont);
139 }
140
141 characters_[static_cast<char>(index)] = c.release();
142 }
143 }
144
145
146 #if ORTHANC_SANDBOXED == 0
147 void Font::LoadFromFile(const std::string& path)
148 {
149 std::string font;
150 SystemToolbox::ReadFile(font, path);
151 LoadFromMemory(font);
152 }
153 #endif
154
155
156 static unsigned int MyMin(unsigned int a,
157 unsigned int b)
158 {
159 return a < b ? a : b;
160 }
161
162
163 void Font::DrawCharacter(ImageAccessor& target,
164 const Character& character,
165 int x,
166 int y,
167 const uint8_t color[4]) const
168 {
169 // Compute the bounds of the character
170 if (x >= static_cast<int>(target.GetWidth()) ||
171 y >= static_cast<int>(target.GetHeight()))
172 {
173 // The character is out of the image
174 return;
175 }
176
177 unsigned int left = x < 0 ? -x : 0;
178 unsigned int top = y < 0 ? -y : 0;
179 unsigned int width = MyMin(character.width_, target.GetWidth() - x);
180 unsigned int height = MyMin(character.height_, target.GetHeight() - y);
181
182 unsigned int bpp = target.GetBytesPerPixel();
183
184 // Blit the font bitmap OVER the target image
185 // https://en.wikipedia.org/wiki/Alpha_compositing
186
187 for (unsigned int cy = top; cy < height; cy++)
188 {
189 uint8_t* p = reinterpret_cast<uint8_t*>(target.GetRow(y + cy)) + (x + left) * bpp;
190 unsigned int pos = cy * character.width_ + left;
191
192 switch (target.GetFormat())
193 {
194 case PixelFormat_Grayscale8:
195 {
196 assert(bpp == 1);
197 for (unsigned int cx = left; cx < width; cx++, pos++, p++)
198 {
199 uint16_t alpha = character.bitmap_[pos];
200 uint16_t value = alpha * static_cast<uint16_t>(color[0]) + (255 - alpha) * static_cast<uint16_t>(*p);
201 *p = static_cast<uint8_t>(value >> 8);
202 }
203
204 break;
205 }
206
207 case PixelFormat_RGB24:
208 {
209 assert(bpp == 3);
210 for (unsigned int cx = left; cx < width; cx++, pos++, p += 3)
211 {
212 uint16_t alpha = character.bitmap_[pos];
213 for (uint8_t i = 0; i < 3; i++)
214 {
215 uint16_t value = alpha * static_cast<uint16_t>(color[i]) + (255 - alpha) * static_cast<uint16_t>(p[i]);
216 p[i] = static_cast<uint8_t>(value >> 8);
217 }
218 }
219
220 break;
221 }
222
223 case PixelFormat_RGBA32:
224 case PixelFormat_BGRA32:
225 {
226 assert(bpp == 4);
227
228 for (unsigned int cx = left; cx < width; cx++, pos++, p += 4)
229 {
230 float alpha = static_cast<float>(character.bitmap_[pos]) / 255.0f;
231 float beta = (1.0f - alpha) * static_cast<float>(p[3]) / 255.0f;
232 float denom = 1.0f / (alpha + beta);
233
234 for (uint8_t i = 0; i < 3; i++)
235 {
236 p[i] = static_cast<uint8_t>((alpha * static_cast<float>(color[i]) +
237 beta * static_cast<float>(p[i])) * denom);
238 }
239
240 p[3] = static_cast<uint8_t>(255.0f * (alpha + beta));
241 }
242
243 break;
244 }
245
246 default:
247 throw OrthancException(ErrorCode_NotImplemented);
248 }
249 }
250
251 }
252
253
254 void Font::DrawInternal(ImageAccessor& target,
255 const std::string& utf8,
256 int x,
257 int y,
258 const uint8_t color[4]) const
259 {
260 if (target.GetFormat() != PixelFormat_Grayscale8 &&
261 target.GetFormat() != PixelFormat_RGB24 &&
262 target.GetFormat() != PixelFormat_RGBA32 &&
263 target.GetFormat() != PixelFormat_BGRA32)
264 {
265 throw OrthancException(ErrorCode_NotImplemented);
266 }
267
268 int a = x;
269
270 #if ORTHANC_ENABLE_LOCALE == 1
271 std::string s = Toolbox::ConvertFromUtf8(utf8, Encoding_Latin1);
272 #else
273 // If the locale support is disabled, simply drop non-ASCII
274 // characters from the source UTF-8 string
275 std::string s = Toolbox::ConvertToAscii(utf8);
276 #endif
277
278 for (size_t i = 0; i < s.size(); i++)
279 {
280 if (s[i] == '\n')
281 {
282 // Go to the next line
283 a = x;
284 y += maxHeight_ + 1;
285 }
286 else
287 {
288 Characters::const_iterator c = characters_.find(s[i]);
289 if (c != characters_.end())
290 {
291 DrawCharacter(target, *c->second, a, y + static_cast<int>(c->second->top_), color);
292 a += c->second->advance_;
293 }
294 }
295 }
296 }
297
298
299 void Font::Draw(ImageAccessor& target,
300 const std::string& utf8,
301 int x,
302 int y,
303 uint8_t grayscale) const
304 {
305 uint8_t color[4] = { grayscale, grayscale, grayscale, 255 };
306 DrawInternal(target, utf8, x, y, color);
307 }
308
309
310 void Font::Draw(ImageAccessor& target,
311 const std::string& utf8,
312 int x,
313 int y,
314 uint8_t r,
315 uint8_t g,
316 uint8_t b) const
317 {
318 uint8_t color[4];
319
320 switch (target.GetFormat())
321 {
322 case PixelFormat_BGRA32:
323 color[0] = b;
324 color[1] = g;
325 color[2] = r;
326 color[3] = 255;
327 break;
328
329 default:
330 color[0] = r;
331 color[1] = g;
332 color[2] = b;
333 color[3] = 255;
334 break;
335 }
336
337 DrawInternal(target, utf8, x, y, color);
338 }
339
340
341 void Font::ComputeTextExtent(unsigned int& width,
342 unsigned int& height,
343 const std::string& utf8) const
344 {
345 width = 0;
346 height = 0;
347
348 #if ORTHANC_ENABLE_LOCALE == 1
349 std::string s = Toolbox::ConvertFromUtf8(utf8, Encoding_Latin1);
350 #else
351 // If the locale support is disabled, simply drop non-ASCII
352 // characters from the source UTF-8 string
353 std::string s = Toolbox::ConvertToAscii(utf8);
354 #endif
355
356 // Compute the text extent
357 unsigned int x = 0;
358 unsigned int y = 0;
359
360 for (size_t i = 0; i < s.size(); i++)
361 {
362 if (s[i] == '\n')
363 {
364 // Go to the next line
365 x = 0;
366 y += (maxHeight_ + 1);
367 }
368 else
369 {
370 Characters::const_iterator c = characters_.find(s[i]);
371 if (c != characters_.end())
372 {
373 x += c->second->advance_;
374
375 unsigned int bottom = y + c->second->top_ + c->second->height_;
376 if (bottom > height)
377 {
378 height = bottom;
379 }
380
381 if (x > width)
382 {
383 width = x;
384 }
385 }
386 }
387 }
388 }
389
390
391 ImageAccessor* Font::Render(const std::string& utf8,
392 PixelFormat format,
393 uint8_t r,
394 uint8_t g,
395 uint8_t b) const
396 {
397 unsigned int width, height;
398 ComputeTextExtent(width, height, utf8);
399
400 std::unique_ptr<ImageAccessor> target(new Image(format, width, height, false));
401 ImageProcessing::Set(*target, 0, 0, 0, 255);
402 Draw(*target, utf8, 0, 0, r, g, b);
403
404 return target.release();
405 }
406
407
408 ImageAccessor* Font::RenderAlpha(const std::string& utf8) const
409 {
410 unsigned int width, height;
411 ComputeTextExtent(width, height, utf8);
412
413 std::unique_ptr<ImageAccessor> target(new Image(PixelFormat_Grayscale8, width, height, false));
414 ImageProcessing::Set(*target, 0);
415 Draw(*target, utf8, 0, 0, 255);
416
417 return target.release();
418 }
419 }