summaryrefslogtreecommitdiff
path: root/src/os/macosx/string_osx.cpp
blob: 6d90b91a8e9d1a45ce677e32af9e6783a059a570 (plain)
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
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
/* $Id$ */

/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */

/** @file string_osx.cpp Functions related to localized text support on OSX. */

#include "../../stdafx.h"
#include "string_osx.h"
#include "../../string_func.h"
#include "../../strings_func.h"
#include "../../table/control_codes.h"
#include "../../fontcache.h"
#include "macos.h"

#include <CoreFoundation/CoreFoundation.h>


#if (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5)
/** Cached current locale. */
static CFLocaleRef _osx_locale = nullptr;
/** CoreText cache for font information, cleared when OTTD changes fonts. */
static CTFontRef _font_cache[FS_END];


/**
 * Wrapper for doing layouts with CoreText.
 */
class CoreTextParagraphLayout : public ParagraphLayouter {
private:
	const CoreTextParagraphLayoutFactory::CharType *text_buffer;
	ptrdiff_t length;
	const FontMap& font_map;

	CTTypesetterRef typesetter;

	CFIndex cur_offset = 0; ///< Offset from the start of the current run from where to output.

public:
	/** Visual run contains data about the bit of text with the same font. */
	class CoreTextVisualRun : public ParagraphLayouter::VisualRun {
	private:
		std::vector<GlyphID> glyphs;
		std::vector<float> positions;
		std::vector<int> glyph_to_char;

		int total_advance = 0;
		Font *font;

	public:
		CoreTextVisualRun(CTRunRef run, Font *font, const CoreTextParagraphLayoutFactory::CharType *buff);
		CoreTextVisualRun(CoreTextVisualRun &&other) = default;

		const GlyphID *GetGlyphs() const override { return &this->glyphs[0]; }
		const float *GetPositions() const override { return &this->positions[0]; }
		const int *GetGlyphToCharMap() const override { return &this->glyph_to_char[0]; }

		const Font *GetFont() const override { return this->font;  }
		int GetLeading() const override { return this->font->fc->GetHeight(); }
		int GetGlyphCount() const override { return (int)this->glyphs.size(); }
		int GetAdvance() const { return this->total_advance; }
	};

	/** A single line worth of VisualRuns. */
	class CoreTextLine : public std::vector<CoreTextVisualRun>, public ParagraphLayouter::Line {
	public:
		CoreTextLine(CTLineRef line, const FontMap &fontMapping, const CoreTextParagraphLayoutFactory::CharType *buff)
		{
			CFArrayRef runs = CTLineGetGlyphRuns(line);
			for (CFIndex i = 0; i < CFArrayGetCount(runs); i++) {
				CTRunRef run = (CTRunRef)CFArrayGetValueAtIndex(runs, i);

				/* Extract font information for this run. */
				CFRange chars = CTRunGetStringRange(run);
				auto map = fontMapping.begin();
				while (map < fontMapping.end() - 1 && map->first <= chars.location) map++;

				this->emplace_back(run, map->second, buff);
			}
			CFRelease(line);
		}

		int GetLeading() const override;
		int GetWidth() const override;
		int CountRuns() const override { return this->size(); }
		const VisualRun &GetVisualRun(int run) const override { return this->at(run);  }

		int GetInternalCharLength(WChar c) const override
		{
			/* CoreText uses UTF-16 internally which means we need to account for surrogate pairs. */
			return c >= 0x010000U ? 2 : 1;
		}
	};

	CoreTextParagraphLayout(CTTypesetterRef typesetter, const CoreTextParagraphLayoutFactory::CharType *buffer, ptrdiff_t len, const FontMap &fontMapping) : text_buffer(buffer), length(len), font_map(fontMapping), typesetter(typesetter)
	{
		this->Reflow();
	}

	~CoreTextParagraphLayout() override
	{
		CFRelease(this->typesetter);
	}

	void Reflow() override
	{
		this->cur_offset = 0;
	}

	std::unique_ptr<const Line> NextLine(int max_width) override;
};


/** Get the width of an encoded sprite font character.  */
static CGFloat SpriteFontGetWidth(void *ref_con)
{
	FontSize fs = (FontSize)((size_t)ref_con >> 24);
	WChar c = (WChar)((size_t)ref_con & 0xFFFFFF);

	return GetGlyphWidth(fs, c);
}

static CTRunDelegateCallbacks _sprite_font_callback = {
	kCTRunDelegateCurrentVersion, nullptr, nullptr, nullptr,
	&SpriteFontGetWidth
};

/* static */ ParagraphLayouter *CoreTextParagraphLayoutFactory::GetParagraphLayout(CharType *buff, CharType *buff_end, FontMap &fontMapping)
{
	if (!MacOSVersionIsAtLeast(10, 5, 0)) return nullptr;

	/* Can't layout an empty string. */
	ptrdiff_t length = buff_end - buff;
	if (length == 0) return nullptr;

	/* Can't layout our in-built sprite fonts. */
	for (const auto &i : fontMapping) {
		if (i.second->fc->IsBuiltInFont()) return nullptr;
	}

	/* Make attributed string with embedded font information. */
	CFMutableAttributedStringRef str = CFAttributedStringCreateMutable(kCFAllocatorDefault, 0);
	CFAttributedStringBeginEditing(str);

	CFStringRef base = CFStringCreateWithCharactersNoCopy(kCFAllocatorDefault, buff, length, kCFAllocatorNull);
	CFAttributedStringReplaceString(str, CFRangeMake(0, 0), base);
	CFRelease(base);

	/* Apply font and colour ranges to our string. This is important to make sure
	 * that we get proper glyph boundaries on style changes. */
	int last = 0;
	for (const auto &i : fontMapping) {
		if (i.first - last == 0) continue;

		if (_font_cache[i.second->fc->GetSize()] == nullptr) {
			/* Cache font information. */
			CFStringRef font_name = CFStringCreateWithCString(kCFAllocatorDefault, i.second->fc->GetFontName(), kCFStringEncodingUTF8);
			_font_cache[i.second->fc->GetSize()] = CTFontCreateWithName(font_name, i.second->fc->GetFontSize(), nullptr);
			CFRelease(font_name);
		}
		CFAttributedStringSetAttribute(str, CFRangeMake(last, i.first - last), kCTFontAttributeName, _font_cache[i.second->fc->GetSize()]);

		CGColorRef color = CGColorCreateGenericGray((uint8)i.second->colour / 255.0f, 1.0f); // We don't care about the real colours, just that they are different.
		CFAttributedStringSetAttribute(str, CFRangeMake(last, i.first - last), kCTForegroundColorAttributeName, color);
		CGColorRelease(color);

		/* Install a size callback for our special sprite glyphs. */
		for (ssize_t c = last; c < i.first; c++) {
			if (buff[c] >= SCC_SPRITE_START && buff[c] <= SCC_SPRITE_END) {
				CTRunDelegateRef del = CTRunDelegateCreate(&_sprite_font_callback, (void *)(size_t)(buff[c] | (i.second->fc->GetSize() << 24)));
				CFAttributedStringSetAttribute(str, CFRangeMake(c, 1), kCTRunDelegateAttributeName, del);
				CFRelease(del);
			}
		}

		last = i.first;
	}
	CFAttributedStringEndEditing(str);

	/* Create and return typesetter for the string. */
	CTTypesetterRef typesetter = CTTypesetterCreateWithAttributedString(str);
	CFRelease(str);

	return typesetter != nullptr ? new CoreTextParagraphLayout(typesetter, buff, length, fontMapping) : nullptr;
}

/* virtual */ std::unique_ptr<const ParagraphLayouter::Line> CoreTextParagraphLayout::NextLine(int max_width)
{
	if (this->cur_offset >= this->length) return nullptr;

	/* Get line break position, trying word breaking first and breaking somewhere if that doesn't work. */
	CFIndex len = CTTypesetterSuggestLineBreak(this->typesetter, this->cur_offset, max_width);
	if (len <= 0) len = CTTypesetterSuggestClusterBreak(this->typesetter, this->cur_offset, max_width);

	/* Create line. */
	CTLineRef line = CTTypesetterCreateLine(this->typesetter, CFRangeMake(this->cur_offset, len));
	this->cur_offset += len;

	return std::unique_ptr<const Line>(line != nullptr ? new CoreTextLine(line, this->font_map, this->text_buffer) : nullptr);
}

CoreTextParagraphLayout::CoreTextVisualRun::CoreTextVisualRun(CTRunRef run, Font *font, const CoreTextParagraphLayoutFactory::CharType *buff) : font(font)
{
	this->glyphs.resize(CTRunGetGlyphCount(run));

	/* Query map of glyphs to source string index. */
	CFIndex map[this->glyphs.size()];
	CTRunGetStringIndices(run, CFRangeMake(0, 0), map);

	this->glyph_to_char.resize(this->glyphs.size());
	for (size_t i = 0; i < this->glyph_to_char.size(); i++) this->glyph_to_char[i] = (int)map[i];

	CGPoint pts[this->glyphs.size()];
	CTRunGetPositions(run, CFRangeMake(0, 0), pts);
	this->positions.resize(this->glyphs.size() * 2 + 2);

	/* Convert glyph array to our data type. At the same time, substitute
	 * the proper glyphs for our private sprite glyphs. */
	CGGlyph gl[this->glyphs.size()];
	CTRunGetGlyphs(run, CFRangeMake(0, 0), gl);
	for (size_t i = 0; i < this->glyphs.size(); i++) {
		if (buff[this->glyph_to_char[i]] >= SCC_SPRITE_START && buff[this->glyph_to_char[i]] <= SCC_SPRITE_END) {
			this->glyphs[i] = font->fc->MapCharToGlyph(buff[this->glyph_to_char[i]]);
			this->positions[i * 2 + 0] = pts[i].x;
			this->positions[i * 2 + 1] = font->fc->GetAscender() - font->fc->GetGlyph(this->glyphs[i])->height - 1; // Align sprite glyphs to font baseline.
		} else {
			this->glyphs[i] = gl[i];
			this->positions[i * 2 + 0] = pts[i].x;
			this->positions[i * 2 + 1] = pts[i].y;
		}
	}
	this->total_advance = (int)CTRunGetTypographicBounds(run, CFRangeMake(0, 0), nullptr, nullptr, nullptr);
	this->positions[this->glyphs.size() * 2] = this->positions[0] + this->total_advance;
}

/**
 * Get the height of the line.
 * @return The maximum height of the line.
 */
int CoreTextParagraphLayout::CoreTextLine::GetLeading() const
{
	int leading = 0;
	for (const auto &run : *this) {
		leading = max(leading, run.GetLeading());
	}

	return leading;
}

/**
 * Get the width of this line.
 * @return The width of the line.
 */
int CoreTextParagraphLayout::CoreTextLine::GetWidth() const
{
	if (this->size() == 0) return 0;

	int total_width = 0;
	for (const auto &run : *this) {
		total_width += run.GetAdvance();
	}

	return total_width;
}


/** Delete CoreText font reference for a specific font size. */
void MacOSResetScriptCache(FontSize size)
{
	if (_font_cache[size] != nullptr) {
		CFRelease(_font_cache[size]);
		_font_cache[size] = nullptr;
	}
}

/** Store current language locale as a CoreFounation locale. */
void MacOSSetCurrentLocaleName(const char *iso_code)
{
	if (!MacOSVersionIsAtLeast(10, 5, 0)) return;

	if (_osx_locale != nullptr) CFRelease(_osx_locale);

	CFStringRef iso = CFStringCreateWithCString(kCFAllocatorNull, iso_code, kCFStringEncodingUTF8);
	_osx_locale = CFLocaleCreate(kCFAllocatorDefault, iso);
	CFRelease(iso);
}

/**
 * Compares two strings using case insensitive natural sort.
 *
 * @param s1 First string to compare.
 * @param s2 Second string to compare.
 * @return 1 if s1 < s2, 2 if s1 == s2, 3 if s1 > s2, or 0 if not supported by the OS.
 */
int MacOSStringCompare(const char *s1, const char *s2)
{
	static bool supported = MacOSVersionIsAtLeast(10, 5, 0);
	if (!supported) return 0;

	CFStringCompareFlags flags = kCFCompareCaseInsensitive | kCFCompareNumerically | kCFCompareLocalized | kCFCompareWidthInsensitive | kCFCompareForcedOrdering;

	CFStringRef cf1 = CFStringCreateWithCString(kCFAllocatorDefault, s1, kCFStringEncodingUTF8);
	CFStringRef cf2 = CFStringCreateWithCString(kCFAllocatorDefault, s2, kCFStringEncodingUTF8);

	CFComparisonResult res = CFStringCompareWithOptionsAndLocale(cf1, cf2, CFRangeMake(0, CFStringGetLength(cf1)), flags, _osx_locale);

	CFRelease(cf1);
	CFRelease(cf2);

	return (int)res + 2;
}


/* virtual */ void OSXStringIterator::SetString(const char *s)
{
	const char *string_base = s;

	this->utf16_to_utf8.clear();
	this->str_info.clear();
	this->cur_pos = 0;

	/* CoreText operates on UTF-16, thus we have to convert the input string.
	 * To be able to return proper offsets, we have to create a mapping at the same time. */
	std::vector<UniChar> utf16_str;     ///< UTF-16 copy of the string.
	while (*s != '\0') {
		size_t idx = s - string_base;

		WChar c = Utf8Consume(&s);
		if (c < 0x10000) {
			utf16_str.push_back((UniChar)c);
		} else {
			/* Make a surrogate pair. */
			utf16_str.push_back((UniChar)(0xD800 + ((c - 0x10000) >> 10)));
			utf16_str.push_back((UniChar)(0xDC00 + ((c - 0x10000) & 0x3FF)));
			this->utf16_to_utf8.push_back(idx);
		}
		this->utf16_to_utf8.push_back(idx);
	}
	this->utf16_to_utf8.push_back(s - string_base);

	/* Query CoreText for word and cluster break information. */
	this->str_info.resize(utf16_to_utf8.size());

	if (utf16_str.size() > 0) {
		CFStringRef str = CFStringCreateWithCharactersNoCopy(kCFAllocatorDefault, &utf16_str[0], utf16_str.size(), kCFAllocatorNull);

		/* Get cluster breaks. */
		for (CFIndex i = 0; i < CFStringGetLength(str); ) {
			CFRange r = CFStringGetRangeOfComposedCharactersAtIndex(str, i);
			this->str_info[r.location].char_stop = true;

			i += r.length;
		}

		/* Get word breaks. */
		CFStringTokenizerRef tokenizer = CFStringTokenizerCreate(kCFAllocatorDefault, str, CFRangeMake(0, CFStringGetLength(str)), kCFStringTokenizerUnitWordBoundary, _osx_locale);

		CFStringTokenizerTokenType tokenType = kCFStringTokenizerTokenNone;
		while ((tokenType = CFStringTokenizerAdvanceToNextToken(tokenizer)) != kCFStringTokenizerTokenNone) {
			/* Skip tokens that are white-space or punctuation tokens. */
			if ((tokenType & kCFStringTokenizerTokenHasNonLettersMask) != kCFStringTokenizerTokenHasNonLettersMask) {
				CFRange r = CFStringTokenizerGetCurrentTokenRange(tokenizer);
				this->str_info[r.location].word_stop = true;
			}
		}

		CFRelease(tokenizer);
		CFRelease(str);
	}

	/* End-of-string is always a valid stopping point. */
	this->str_info.back().char_stop = true;
	this->str_info.back().word_stop = true;
}

/* virtual */ size_t OSXStringIterator::SetCurPosition(size_t pos)
{
	/* Convert incoming position to an UTF-16 string index. */
	size_t utf16_pos = 0;
	for (size_t i = 0; i < this->utf16_to_utf8.size(); i++) {
		if (this->utf16_to_utf8[i] == pos) {
			utf16_pos = i;
			break;
		}
	}

	/* Sanitize in case we get a position inside a grapheme cluster. */
	while (utf16_pos > 0 && !this->str_info[utf16_pos].char_stop) utf16_pos--;
	this->cur_pos = utf16_pos;

	return this->utf16_to_utf8[this->cur_pos];
}

/* virtual */ size_t OSXStringIterator::Next(IterType what)
{
	assert(this->cur_pos <= this->utf16_to_utf8.size());
	assert(what == StringIterator::ITER_CHARACTER || what == StringIterator::ITER_WORD);

	if (this->cur_pos == this->utf16_to_utf8.size()) return END;

	do {
		this->cur_pos++;
	} while (this->cur_pos < this->utf16_to_utf8.size() && (what  == ITER_WORD ? !this->str_info[this->cur_pos].word_stop : !this->str_info[this->cur_pos].char_stop));

	return this->cur_pos == this->utf16_to_utf8.size() ? END : this->utf16_to_utf8[this->cur_pos];
}

/* virtual */ size_t OSXStringIterator::Prev(IterType what)
{
	assert(this->cur_pos <= this->utf16_to_utf8.size());
	assert(what == StringIterator::ITER_CHARACTER || what == StringIterator::ITER_WORD);

	if (this->cur_pos == 0) return END;

	do {
		this->cur_pos--;
	} while (this->cur_pos > 0 && (what == ITER_WORD ? !this->str_info[this->cur_pos].word_stop : !this->str_info[this->cur_pos].char_stop));

	return this->utf16_to_utf8[this->cur_pos];
}

/* static */ StringIterator *OSXStringIterator::Create()
{
	if (!MacOSVersionIsAtLeast(10, 5, 0)) return nullptr;

	return new OSXStringIterator();
}

#else
void MacOSResetScriptCache(FontSize size) {}
void MacOSSetCurrentLocaleName(const char *iso_code) {}

int MacOSStringCompare(const char *s1, const char *s2)
{
	return 0;
}

/* static */ StringIterator *OSXStringIterator::Create()
{
	return nullptr;
}

/* static */ ParagraphLayouter *CoreTextParagraphLayoutFactory::GetParagraphLayout(CharType *buff, CharType *buff_end, FontMap &fontMapping)
{
	return nullptr;
}
#endif /* (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5) */