aboutsummaryrefslogtreecommitdiff
path: root/saga/font.cpp
blob: 0b0bc676080efac6e28dcd0540ddacc367edf169 (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
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
/* ScummVM - Scumm Interpreter
 * Copyright (C) 2004-2005 The ScummVM project
 *
 * The ReInherit Engine is (C)2000-2003 by Daniel Balsom.
 *
 * This program 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; either version 2
 * of the License, or (at your option) any later version.

 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * $Header$
 *
 */

// Font management and font drawing module
#include "saga/saga.h"
#include "saga/gfx.h"

#include "saga/rscfile_mod.h"

#include "saga/font.h"
#include "saga/stream.h"

namespace Saga {

Font::Font(SagaEngine *vm) : _vm(vm), _initialized(false) {
	int i;

	// Load font module resource context 
	_fontContext = _vm->getFileContext(GAME_RESOURCEFILE, 0);
	if (_fontContext == NULL) {
		error("Font::Font(): Couldn't get resource context.");
	}

	assert(_vm->getFontsCount() > 0);

	_nFonts = _vm->getFontsCount();

	_fonts = (FONT **)malloc(_nFonts * sizeof(*_fonts));
	if (_fonts == NULL) {
		error("Font::Font(): Memory allocation failure.");
	}

	for (i = 0; i < _nFonts; i++) {
		loadFont(_vm->getFontDescription(i)->font_rn, _vm->getFontDescription(i)->font_id);
	}

	_initialized = true;
}

Font::~Font(void) {
//	int i;

	debug(0, "Font::~Font(): Freeing fonts.");
/*
	for (i = 0 ; i < FONT_COUNT ; i++) {
		if (_fonts[i] != NULL) {
			if (_fonts[i]->normal_loaded) {
				free(_fonts[i]->normal->font_free_p);
				free(_fonts[i]->normal);
			}

			if (_fonts[i]->outline_loaded) {
				free(_fonts[i]->outline->font_free_p);
				free(_fonts[i]->outline);
			}
		}

		free(_fonts[i]);
	}
*/
}

int Font::loadFont(uint32 font_rn, int font_id) {
	FONT_HEADER fh;
	FONT *font;
	FONT_STYLE *normal_font;
	byte *fontres_p;
	size_t fontres_len;
	int nbits;
	int c;

	if ((font_id < 0) || (font_id >= _nFonts)) {
		return FAILURE;
	}

	// Load font resource
	if (RSC_LoadResource(_fontContext, font_rn, &fontres_p, &fontres_len) != SUCCESS) {
		error("Font::loadFont(): Couldn't load font resource.");
	}

	if (fontres_len < FONT_DESCSIZE) {
		warning("Font::loadFont(): Invalid font length (%d < %d)", fontres_len, FONT_DESCSIZE);
		return FAILURE;
	}

	MemoryReadStreamEndian readS(fontres_p, fontres_len, IS_BIG_ENDIAN);

	// Create new font structure
	font = (FONT *)malloc(sizeof(*font));
	if (font == NULL) {
		error("Font:loadFont(): Memory allocation error.");
	}

	// Read font header
	fh.c_height = readS.readUint16();
	fh.c_width = readS.readUint16();
	fh.row_length = readS.readUint16();

	debug(1, "Font::loadFont(): Reading font resource #%d...", font_rn);

	debug(2, "Character width: %d", fh.c_width);
	debug(2, "Character height: %d", fh.c_height);
	debug(2, "Row padding: %d", fh.row_length);

	// Create normal font style
	normal_font = (FONT_STYLE *)malloc(sizeof(*normal_font));
	if (normal_font == NULL) {
		error("Font::loadFont(): Memory allocation error.");
	}

	normal_font->font_free_p = fontres_p;
	normal_font->hdr.c_height = fh.c_height;
	normal_font->hdr.c_width = fh.c_width;
	normal_font->hdr.row_length = fh.row_length;

	for (c = 0; c < FONT_CHARCOUNT; c++) {
		normal_font->fce[c].index = readS.readUint16();
	}

	for (c = 0; c < FONT_CHARCOUNT; c++) {
		nbits = normal_font->fce[c].width = readS.readByte();
		normal_font->fce[c].byte_width = getByteLen(nbits);
	}

	for (c = 0; c < FONT_CHARCOUNT; c++) {
		normal_font->fce[c].flag = readS.readByte();
	}

	for (c = 0; c < FONT_CHARCOUNT; c++) {
		normal_font->fce[c].tracking = readS.readByte();
	}

	if (readS.pos() != FONT_DESCSIZE) {
		warning("Invalid font resource size.");
		return FAILURE;
	}

	normal_font->font_p = fontres_p + FONT_DESCSIZE;

	font->normal = normal_font;
	font->normal_loaded = 1;

	// Create outline font style
	font->outline = createOutline(normal_font);
	font->outline_loaded = 1;

	// Set font data 
	_fonts[font_id] = font;

	return SUCCESS;
}

int Font::getHeight(int font_id) {
	FONT *font;

	if (!_initialized) {
		return FAILURE;
	}

	if ((font_id < 0) || (font_id >= _nFonts) || (_fonts[font_id] == NULL)) {
		error("Font::getHeight(): Invalid font id.");
	}

	font = _fonts[font_id];

	return font->normal->hdr.c_height;
}

FONT_STYLE *Font::createOutline(FONT_STYLE *src_font) {
	FONT_STYLE *new_font;
	unsigned char *new_font_data;
	size_t new_font_data_len;
	int s_width = src_font->hdr.c_width;
	int s_height = src_font->hdr.c_height;
	int new_row_len = 0;
	int row;
	int i;
	int index;
	size_t index_offset = 0;
	int new_byte_width;
	int old_byte_width;
	int current_byte;
	unsigned char *base_ptr;
	unsigned char *src_ptr;
	unsigned char *dest_ptr1;
	unsigned char *dest_ptr2;
	unsigned char *dest_ptr3;
	unsigned char c_rep;

	// Create new font style structure
	new_font = (FONT_STYLE *)malloc(sizeof(*new_font));

	if (new_font == NULL) {
		error("Font::createOutline(): Memory allocation error.");
	}

	memset(new_font, 0, sizeof(*new_font));

	// Populate new font style character data 
	for (i = 0; i < FONT_CHARCOUNT; i++) {
		new_byte_width = 0;
		old_byte_width = 0;
		index = src_font->fce[i].index;
		if ((index > 0) || (i == FONT_FIRSTCHAR)) {
			index += index_offset;
		}

		new_font->fce[i].index = index;
		new_font->fce[i].tracking = src_font->fce[i].tracking;
		new_font->fce[i].flag = src_font->fce[i].flag;

		if (src_font->fce[i].width != 0) {
			new_byte_width = getByteLen(src_font->fce[i].width + 2);
			old_byte_width = getByteLen(src_font->fce[i].width);

			if (new_byte_width > old_byte_width) {
				index_offset++;
			}
		}

		new_font->fce[i].width = src_font->fce[i].width + 2;
		new_font->fce[i].byte_width = new_byte_width;
		new_row_len += new_byte_width;
	}

	debug(2, "New row length: %d", new_row_len);

	new_font->hdr.c_width = s_width + 2;
	new_font->hdr.c_height = s_height + 2;
	new_font->hdr.row_length = new_row_len;

	// Allocate new font representation storage 
	new_font_data_len = new_row_len * (s_height + 2);
	new_font_data = (unsigned char *)malloc(new_font_data_len);

	if (new_font_data == NULL) {
		error("Font::createOutline(): Memory allocation error.");
	}

	memset(new_font_data, 0, new_font_data_len);

	new_font->font_free_p = new_font_data;
	new_font->font_p = new_font_data;

	// Generate outline font representation
	for (i = 0; i < FONT_CHARCOUNT; i++) {
		for (row = 0; row < s_height; row++) {
			for (current_byte = 0; current_byte < new_font->fce[i].byte_width; current_byte++) {
				base_ptr = new_font->font_p + new_font->fce[i].index + current_byte;
				dest_ptr1 = base_ptr + new_font->hdr.row_length * row;
				dest_ptr2 = base_ptr + new_font->hdr.row_length * (row + 1);
				dest_ptr3 = base_ptr + new_font->hdr.row_length * (row + 2);
				if (current_byte > 0) {
					// Get last two columns from previous byte
					src_ptr = src_font->font_p + src_font->hdr.row_length * row + src_font->fce[i].index +
								(current_byte - 1);
					c_rep = *src_ptr;
					*dest_ptr1 |= ((c_rep << 6) | (c_rep << 7));
					*dest_ptr2 |= ((c_rep << 6) | (c_rep << 7));
					*dest_ptr3 |= ((c_rep << 6) | (c_rep << 7));
				}

				if (current_byte < src_font->fce[i].byte_width) {
					src_ptr = src_font->font_p + src_font->hdr.row_length * row + src_font->fce[i].index +
								current_byte;
					c_rep = *src_ptr;
					*dest_ptr1 |= c_rep | (c_rep >> 1) | (c_rep >> 2);
					*dest_ptr2 |= c_rep | (c_rep >> 1) | (c_rep >> 2);
					*dest_ptr3 |= c_rep | (c_rep >> 1) | (c_rep >> 2);
				}
			}
		}

		// "Hollow out" character to prevent overdraw
		for (row = 0; row < s_height; row++) {
			for (current_byte = 0; current_byte < new_font->fce[i].byte_width; current_byte++) {
				dest_ptr2 = new_font->font_p +  new_font->hdr.row_length * (row + 1) + new_font->fce[i].index + current_byte;
				if (current_byte > 0) {
					// Get last two columns from previous byte
					src_ptr = src_font->font_p + src_font->hdr.row_length * row + src_font->fce[i].index +
								(current_byte - 1);
					*dest_ptr2 &= ((*src_ptr << 7) ^ 0xFFU);
				}

				if (current_byte < src_font->fce[i].byte_width) {
					src_ptr = src_font->font_p + src_font->hdr.row_length * row + src_font->fce[i].index +
								current_byte;
					*dest_ptr2 &= ((*src_ptr >> 1) ^ 0xFFU);
				}
			}
		}
	}

	return new_font;
}

int Font::getByteLen(int num_bits) {
	int byte_len;
	byte_len = num_bits / 8;

	if (num_bits % 8) {
		byte_len++;
	}

	return byte_len;
}

// Returns the horizontal length in pixels of the graphical representation
// of at most 'test_str_ct' characters of the string 'test_str', taking
// into account any formatting options specified by 'flags'.
// If 'test_str_ct' is 0, all characters of 'test_str' are counted.
int Font::getStringWidth(int font_id, const char *test_str, size_t test_str_ct, int flags) {
	FONT *font;
	size_t ct;
	int width = 0;
	int ch;
	const byte *txt_p;

	if (!_initialized) {
		return FAILURE;
	}

	if ((font_id < 0) || (font_id >= _nFonts) || (_fonts[font_id] == NULL)) {
		error("Font::getStringWidth(): Invalid font id.");
	}

	font = _fonts[font_id];
	assert(font != NULL);

	txt_p = (const byte *) test_str;

	for (ct = test_str_ct; *txt_p && (!test_str_ct || ct > 0); txt_p++, ct--) {
		ch = *txt_p & 0xFFU;
		// Translate character
		ch = _charMap[ch];
		assert(ch < FONT_CHARCOUNT);
		width += font->normal->fce[ch].tracking;
	}

	if ((flags & FONT_BOLD) || (flags & FONT_OUTLINE)) {
		width += 1;
	}

	return width;
}

int Font::draw(int font_id, SURFACE *ds, const char *draw_str, size_t draw_str_ct,
			int text_x, int text_y, int color, int effect_color, int flags) {
	FONT *font;

	if (!_initialized) {
		error("Font::draw(): Font Module not initialized.");
	}

	if ((font_id < 0) || (font_id >= _nFonts) || (_fonts[font_id] == NULL)) {
		error("Font::draw(): Invalid font id.");
	}

	font = _fonts[font_id];

	if (flags & FONT_OUTLINE) { 
		outFont(font->outline, ds, draw_str, draw_str_ct, text_x - 1, text_y - 1, effect_color);
		outFont(font->normal, ds, draw_str, draw_str_ct, text_x, text_y, color);
	} else if (flags & FONT_SHADOW) {
		outFont(font->normal, ds, draw_str, draw_str_ct, text_x - 1, text_y + 1, effect_color);
		outFont(font->normal, ds, draw_str, draw_str_ct, text_x, text_y, color);
	} else { // FONT_NORMAL
		outFont(font->normal, ds, draw_str, draw_str_ct, text_x, text_y, color);
	}

	return SUCCESS;
}

int Font::outFont(FONT_STYLE * draw_font, SURFACE * ds, const char *draw_str, size_t draw_str_ct,
				int text_x, int text_y, int color) {
	const byte *draw_str_p;
	byte *c_data_ptr;
	int c_code;
	int char_row;

	byte *output_ptr;
	byte *output_ptr_min;
	byte *output_ptr_max;

	int row;
	int row_limit;

	int c_byte_len;
	int c_byte;
	int c_bit;
	int ct;

	if ((text_x > ds->w) || (text_y > ds->h)) {
		// Output string can't be visible
		return SUCCESS;
	}

	draw_str_p = (const byte *) draw_str;
	ct = draw_str_ct;

	// Draw string one character at a time, maximum of 'draw_str'_ct 
	// characters, or no limit if 'draw_str_ct' is 0
	for (; *draw_str_p && (!draw_str_ct || ct); draw_str_p++, ct--) {
		c_code = *draw_str_p & 0xFFU;

		// Translate character
		c_code = _charMap[c_code];
		assert(c_code < FONT_CHARCOUNT);

		// Check if character is defined
		if ((draw_font->fce[c_code].index == 0) && (c_code != FONT_FIRSTCHAR)) {
#if FONT_SHOWUNDEFINED
			if (c_code == FONT_CH_SPACE) {
				text_x += draw_font->fce[c_code].tracking;
				continue;
			}
			c_code = FONT_CH_QMARK;
#else
			// Character code is not defined, but advance tracking
			// ( Not defined if offset is 0, except for 33 ('!') which
			//   is defined )
			text_x += draw_font->fce[c_code].tracking;
			continue;
#endif
		}

		// Get length of character in bytes
		c_byte_len = ((draw_font->fce[c_code].width - 1) / 8) + 1;
		row_limit = (ds->h < (text_y + draw_font->hdr.c_height)) ? ds->h : text_y + draw_font->hdr.c_height;
		char_row = 0;

		for (row = text_y; row < row_limit; row++, char_row++) {
			// Clip negative rows */
			if (row < 0) {
				continue;
			}

			output_ptr = (byte *)ds->pixels + (ds->pitch * row) + text_x;
			output_ptr_min = (byte *)ds->pixels + (ds->pitch * row) + (text_x > 0 ? text_x : 0);
			output_ptr_max = output_ptr + (ds->pitch - text_x);

			// If character starts off the screen, jump to next character
			if (output_ptr < output_ptr_min) {
				break;
			}

			c_data_ptr = draw_font->font_p + char_row * draw_font->hdr.row_length + draw_font->fce[c_code].index;

			for (c_byte = 0; c_byte < c_byte_len; c_byte++, c_data_ptr++) {
				// Check each bit, draw pixel if bit is set
				for (c_bit = 7; c_bit >= 0 && (output_ptr < output_ptr_max); c_bit--) {
					if ((*c_data_ptr >> c_bit) & 0x01) {
						*output_ptr = (byte) color;
					}
					output_ptr++;
				} // end per-bit processing
			} // end per-byte processing
		} // end per-row processing

		// Advance tracking position
		text_x += draw_font->fce[c_code].tracking;
	} // end per-character processing

	return SUCCESS;
}

} // End of namespace Saga