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Merge svn changes up to r28755
[mplayer.git] / libass / ass_render.c
bloba755f232237653922daee32be8d541f41a86febf
1 // -*- c-basic-offset: 8; indent-tabs-mode: t -*-
2 // vim:ts=8:sw=8:noet:ai:
3 /*
4 * Copyright (C) 2006 Evgeniy Stepanov <eugeni.stepanov@gmail.com>
5 *
6 * This file is part of libass.
7 *
8 * libass is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * libass is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License along
19 * with libass; if not, write to the Free Software Foundation, Inc.,
20 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 */
22
23 #include "config.h"
24
25 #include <assert.h>
26 #include <math.h>
27 #include <inttypes.h>
28 #include <ft2build.h>
29 #include FT_FREETYPE_H
30 #include FT_STROKER_H
31 #include FT_GLYPH_H
32 #include FT_SYNTHESIS_H
33
34 #include "mputils.h"
35
36 #include "ass.h"
37 #include "ass_font.h"
38 #include "ass_bitmap.h"
39 #include "ass_cache.h"
40 #include "ass_utils.h"
41 #include "ass_fontconfig.h"
42 #include "ass_library.h"
43
44 #define MAX_GLYPHS 3000
45 #define MAX_LINES 300
46 #define BE_RADIUS 1.5
47 #define BLUR_MAX_RADIUS 50.0
48
49 static int last_render_id = 0;
50
51 typedef struct ass_settings_s {
52 int frame_width;
53 int frame_height;
54 double font_size_coeff; // font size multiplier
55 double line_spacing; // additional line spacing (in frame pixels)
56 int top_margin; // height of top margin. Everything except toptitles is shifted down by top_margin.
57 int bottom_margin; // height of bottom margin. (frame_height - top_margin - bottom_margin) is original video height.
58 int left_margin;
59 int right_margin;
60 int use_margins; // 0 - place all subtitles inside original frame
61 // 1 - use margins for placing toptitles and subtitles
62 double aspect; // frame aspect ratio, d_width / d_height.
63 ass_hinting_t hinting;
64
65 char* default_font;
66 char* default_family;
67 } ass_settings_t;
68
69 // a rendered event
70 typedef struct event_images_s {
71 ass_image_t* imgs;
72 int top, height;
73 int detect_collisions;
74 int shift_direction;
75 ass_event_t* event;
76 } event_images_t;
77
78 struct ass_renderer_s {
79 ass_library_t* library;
80 FT_Library ftlibrary;
81 fc_instance_t* fontconfig_priv;
82 ass_settings_t settings;
83 int render_id;
84 ass_synth_priv_t* synth_priv;
85 ass_synth_priv_t* synth_priv_blur;
86
87 ass_image_t* images_root; // rendering result is stored here
88 ass_image_t* prev_images_root;
89
90 event_images_t* eimg; // temporary buffer for sorting rendered events
91 int eimg_size; // allocated buffer size
92 };
93
94 typedef enum {EF_NONE = 0, EF_KARAOKE, EF_KARAOKE_KF, EF_KARAOKE_KO} effect_t;
95
96 // describes a glyph
97 // glyph_info_t and text_info_t are used for text centering and word-wrapping operations
98 typedef struct glyph_info_s {
99 unsigned symbol;
100 FT_Glyph glyph;
101 FT_Glyph outline_glyph;
102 bitmap_t* bm; // glyph bitmap
103 bitmap_t* bm_o; // outline bitmap
104 bitmap_t* bm_s; // shadow bitmap
105 FT_BBox bbox;
106 FT_Vector pos;
107 char linebreak; // the first (leading) glyph of some line ?
108 uint32_t c[4]; // colors
109 FT_Vector advance; // 26.6
110 effect_t effect_type;
111 int effect_timing; // time duration of current karaoke word
112 // after process_karaoke_effects: distance in pixels from the glyph origin.
113 // part of the glyph to the left of it is displayed in a different color.
114 int effect_skip_timing; // delay after the end of last karaoke word
115 int asc, desc; // font max ascender and descender
116 // int height;
117 int be; // blur edges
118 double blur; // gaussian blur
119 int shadow;
120 double frx, fry, frz; // rotation
121
122 bitmap_hash_key_t hash_key;
123 } glyph_info_t;
124
125 typedef struct line_info_s {
126 int asc, desc;
127 } line_info_t;
128
129 typedef struct text_info_s {
130 glyph_info_t* glyphs;
131 int length;
132 line_info_t lines[MAX_LINES];
133 int n_lines;
134 int height;
135 } text_info_t;
136
137
138 // Renderer state.
139 // Values like current font face, color, screen position, clipping and so on are stored here.
140 typedef struct render_context_s {
141 ass_event_t* event;
142 ass_style_t* style;
143
144 ass_font_t* font;
145 char* font_path;
146 double font_size;
147
148 FT_Stroker stroker;
149 int alignment; // alignment overrides go here; if zero, style value will be used
150 double frx, fry, frz;
151 enum { EVENT_NORMAL, // "normal" top-, sub- or mid- title
152 EVENT_POSITIONED, // happens after pos(,), margins are ignored
153 EVENT_HSCROLL, // "Banner" transition effect, text_width is unlimited
154 EVENT_VSCROLL // "Scroll up", "Scroll down" transition effects
155 } evt_type;
156 double pos_x, pos_y; // position
157 double org_x, org_y; // origin
158 char have_origin; // origin is explicitly defined; if 0, get_base_point() is used
159 double scale_x, scale_y;
160 double hspacing; // distance between letters, in pixels
161 double border; // outline width
162 uint32_t c[4]; // colors(Primary, Secondary, so on) in RGBA
163 int clip_x0, clip_y0, clip_x1, clip_y1;
164 char detect_collisions;
165 uint32_t fade; // alpha from \fad
166 char be; // blur edges
167 double blur; // gaussian blur
168 int shadow;
169 int drawing_mode; // not implemented; when != 0 text is discarded, except for style override tags
170
171 effect_t effect_type;
172 int effect_timing;
173 int effect_skip_timing;
174
175 enum { SCROLL_LR, // left-to-right
176 SCROLL_RL,
177 SCROLL_TB, // top-to-bottom
178 SCROLL_BT
179 } scroll_direction; // for EVENT_HSCROLL, EVENT_VSCROLL
180 int scroll_shift;
181
182 // face properties
183 char* family;
184 unsigned bold;
185 unsigned italic;
186
187 } render_context_t;
188
189 // frame-global data
190 typedef struct frame_context_s {
191 ass_renderer_t* ass_priv;
192 int width, height; // screen dimensions
193 int orig_height; // frame height ( = screen height - margins )
194 int orig_width; // frame width ( = screen width - margins )
195 int orig_height_nocrop; // frame height ( = screen height - margins + cropheight)
196 int orig_width_nocrop; // frame width ( = screen width - margins + cropwidth)
197 ass_track_t* track;
198 long long time; // frame's timestamp, ms
199 double font_scale;
200 double font_scale_x; // x scale applied to all glyphs to preserve text aspect ratio
201 double border_scale;
202 } frame_context_t;
203
204 static ass_renderer_t* ass_renderer;
205 static ass_settings_t* global_settings;
206 static text_info_t text_info;
207 static render_context_t render_context;
208 static frame_context_t frame_context;
209
210 struct render_priv_s {
211 int top, height;
212 int render_id;
213 };
214
215 static void ass_lazy_track_init(void)
216 {
217 ass_track_t* track = frame_context.track;
218 if (track->PlayResX && track->PlayResY)
219 return;
220 if (!track->PlayResX && !track->PlayResY) {
221 mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_NeitherPlayResXNorPlayResYDefined);
222 track->PlayResX = 384;
223 track->PlayResY = 288;
224 } else {
225 double orig_aspect = (global_settings->aspect * frame_context.height * frame_context.orig_width) /
226 frame_context.orig_height / frame_context.width;
227 if (!track->PlayResY) {
228 track->PlayResY = track->PlayResX / orig_aspect + .5;
229 mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_PlayResYUndefinedSettingY, track->PlayResY);
230 } else if (!track->PlayResX) {
231 track->PlayResX = track->PlayResY * orig_aspect + .5;
232 mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_PlayResXUndefinedSettingX, track->PlayResX);
233 }
234 }
235 }
236
237 ass_renderer_t* ass_renderer_init(ass_library_t* library)
238 {
239 int error;
240 FT_Library ft;
241 ass_renderer_t* priv = 0;
242 int vmajor, vminor, vpatch;
243
244 memset(&render_context, 0, sizeof(render_context));
245 memset(&frame_context, 0, sizeof(frame_context));
246 memset(&text_info, 0, sizeof(text_info));
247
248 error = FT_Init_FreeType( &ft );
249 if ( error ) {
250 mp_msg(MSGT_ASS, MSGL_FATAL, MSGTR_LIBASS_FT_Init_FreeTypeFailed);
251 goto ass_init_exit;
252 }
253
254 FT_Library_Version(ft, &vmajor, &vminor, &vpatch);
255 mp_msg(MSGT_ASS, MSGL_V, "FreeType library version: %d.%d.%d\n",
256 vmajor, vminor, vpatch);
257 mp_msg(MSGT_ASS, MSGL_V, "FreeType headers version: %d.%d.%d\n",
258 FREETYPE_MAJOR, FREETYPE_MINOR, FREETYPE_PATCH);
259
260 priv = calloc(1, sizeof(ass_renderer_t));
261 if (!priv) {
262 FT_Done_FreeType(ft);
263 goto ass_init_exit;
264 }
265
266 priv->synth_priv = ass_synth_init(BE_RADIUS);
267 priv->synth_priv_blur = ass_synth_init(BLUR_MAX_RADIUS);
268
269 priv->library = library;
270 priv->ftlibrary = ft;
271 // images_root and related stuff is zero-filled in calloc
272
273 ass_font_cache_init();
274 ass_bitmap_cache_init();
275 ass_glyph_cache_init();
276
277 text_info.glyphs = calloc(MAX_GLYPHS, sizeof(glyph_info_t));
278
279 ass_init_exit:
280 if (priv) mp_msg(MSGT_ASS, MSGL_INFO, MSGTR_LIBASS_Init);
281 else mp_msg(MSGT_ASS, MSGL_ERR, MSGTR_LIBASS_InitFailed);
282
283 return priv;
284 }
285
286 void ass_renderer_done(ass_renderer_t* priv)
287 {
288 ass_font_cache_done();
289 ass_bitmap_cache_done();
290 ass_glyph_cache_done();
291 if (render_context.stroker) {
292 FT_Stroker_Done(render_context.stroker);
293 render_context.stroker = 0;
294 }
295 if (priv && priv->ftlibrary) FT_Done_FreeType(priv->ftlibrary);
296 if (priv && priv->fontconfig_priv) fontconfig_done(priv->fontconfig_priv);
297 if (priv && priv->synth_priv) ass_synth_done(priv->synth_priv);
298 if (priv && priv->eimg) free(priv->eimg);
299 if (priv) free(priv);
300 if (text_info.glyphs) free(text_info.glyphs);
301 }
302
303 /**
304 * \brief Create a new ass_image_t
305 * Parameters are the same as ass_image_t fields.
306 */
307 static ass_image_t* my_draw_bitmap(unsigned char* bitmap, int bitmap_w, int bitmap_h, int stride, int dst_x, int dst_y, uint32_t color)
308 {
309 ass_image_t* img = calloc(1, sizeof(ass_image_t));
310
311 img->w = bitmap_w;
312 img->h = bitmap_h;
313 img->stride = stride;
314 img->bitmap = bitmap;
315 img->color = color;
316 img->dst_x = dst_x;
317 img->dst_y = dst_y;
318
319 return img;
320 }
321
322 /**
323 * \brief convert bitmap glyph into ass_image_t struct(s)
324 * \param bit freetype bitmap glyph, FT_PIXEL_MODE_GRAY
325 * \param dst_x bitmap x coordinate in video frame
326 * \param dst_y bitmap y coordinate in video frame
327 * \param color first color, RGBA
328 * \param color2 second color, RGBA
329 * \param brk x coordinate relative to glyph origin, color is used to the left of brk, color2 - to the right
330 * \param tail pointer to the last image's next field, head of the generated list should be stored here
331 * \return pointer to the new list tail
332 * Performs clipping. Uses my_draw_bitmap for actual bitmap convertion.
333 */
334 static ass_image_t** render_glyph(bitmap_t* bm, int dst_x, int dst_y, uint32_t color, uint32_t color2, int brk, ass_image_t** tail)
335 {
336 // brk is relative to dst_x
337 // color = color left of brk
338 // color2 = color right of brk
339 int b_x0, b_y0, b_x1, b_y1; // visible part of the bitmap
340 int clip_x0, clip_y0, clip_x1, clip_y1;
341 int tmp;
342 ass_image_t* img;
343
344 dst_x += bm->left;
345 dst_y += bm->top;
346 brk -= bm->left;
347
348 // clipping
349 clip_x0 = render_context.clip_x0;
350 clip_y0 = render_context.clip_y0;
351 clip_x1 = render_context.clip_x1;
352 clip_y1 = render_context.clip_y1;
353 b_x0 = 0;
354 b_y0 = 0;
355 b_x1 = bm->w;
356 b_y1 = bm->h;
357
358 tmp = dst_x - clip_x0;
359 if (tmp < 0) {
360 mp_msg(MSGT_ASS, MSGL_DBG2, "clip left\n");
361 b_x0 = - tmp;
362 }
363 tmp = dst_y - clip_y0;
364 if (tmp < 0) {
365 mp_msg(MSGT_ASS, MSGL_DBG2, "clip top\n");
366 b_y0 = - tmp;
367 }
368 tmp = clip_x1 - dst_x - bm->w;
369 if (tmp < 0) {
370 mp_msg(MSGT_ASS, MSGL_DBG2, "clip right\n");
371 b_x1 = bm->w + tmp;
372 }
373 tmp = clip_y1 - dst_y - bm->h;
374 if (tmp < 0) {
375 mp_msg(MSGT_ASS, MSGL_DBG2, "clip bottom\n");
376 b_y1 = bm->h + tmp;
377 }
378
379 if ((b_y0 >= b_y1) || (b_x0 >= b_x1))
380 return tail;
381
382 if (brk > b_x0) { // draw left part
383 if (brk > b_x1) brk = b_x1;
384 img = my_draw_bitmap(bm->buffer + bm->w * b_y0 + b_x0,
385 brk - b_x0, b_y1 - b_y0, bm->w,
386 dst_x + b_x0, dst_y + b_y0, color);
387 *tail = img;
388 tail = &img->next;
389 }
390 if (brk < b_x1) { // draw right part
391 if (brk < b_x0) brk = b_x0;
392 img = my_draw_bitmap(bm->buffer + bm->w * b_y0 + brk,
393 b_x1 - brk, b_y1 - b_y0, bm->w,
394 dst_x + brk, dst_y + b_y0, color2);
395 *tail = img;
396 tail = &img->next;
397 }
398 return tail;
399 }
400
401 /**
402 * \brief Convert text_info_t struct to ass_image_t list
403 * Splits glyphs in halves when needed (for \kf karaoke).
404 */
405 static ass_image_t* render_text(text_info_t* text_info, int dst_x, int dst_y)
406 {
407 int pen_x, pen_y;
408 int i;
409 bitmap_t* bm;
410 ass_image_t* head;
411 ass_image_t** tail = &head;
412
413 for (i = 0; i < text_info->length; ++i) {
414 glyph_info_t* info = text_info->glyphs + i;
415 if ((info->symbol == 0) || (info->symbol == '\n') || !info->bm_s || (info->shadow == 0))
416 continue;
417
418 pen_x = dst_x + info->pos.x + info->shadow;
419 pen_y = dst_y + info->pos.y + info->shadow;
420 bm = info->bm_s;
421
422 tail = render_glyph(bm, pen_x, pen_y, info->c[3], 0, 1000000, tail);
423 }
424
425 for (i = 0; i < text_info->length; ++i) {
426 glyph_info_t* info = text_info->glyphs + i;
427 if ((info->symbol == 0) || (info->symbol == '\n') || !info->bm_o)
428 continue;
429
430 pen_x = dst_x + info->pos.x;
431 pen_y = dst_y + info->pos.y;
432 bm = info->bm_o;
433
434 if ((info->effect_type == EF_KARAOKE_KO) && (info->effect_timing <= info->bbox.xMax)) {
435 // do nothing
436 } else
437 tail = render_glyph(bm, pen_x, pen_y, info->c[2], 0, 1000000, tail);
438 }
439 for (i = 0; i < text_info->length; ++i) {
440 glyph_info_t* info = text_info->glyphs + i;
441 if ((info->symbol == 0) || (info->symbol == '\n') || !info->bm)
442 continue;
443
444 pen_x = dst_x + info->pos.x;
445 pen_y = dst_y + info->pos.y;
446 bm = info->bm;
447
448 if ((info->effect_type == EF_KARAOKE) || (info->effect_type == EF_KARAOKE_KO)) {
449 if (info->effect_timing > info->bbox.xMax)
450 tail = render_glyph(bm, pen_x, pen_y, info->c[0], 0, 1000000, tail);
451 else
452 tail = render_glyph(bm, pen_x, pen_y, info->c[1], 0, 1000000, tail);
453 } else if (info->effect_type == EF_KARAOKE_KF) {
454 tail = render_glyph(bm, pen_x, pen_y, info->c[0], info->c[1], info->effect_timing, tail);
455 } else
456 tail = render_glyph(bm, pen_x, pen_y, info->c[0], 0, 1000000, tail);
457 }
458
459 *tail = 0;
460 return head;
461 }
462
463 /**
464 * \brief Mapping between script and screen coordinates
465 */
466 static int x2scr(double x) {
467 return x*frame_context.orig_width_nocrop / frame_context.track->PlayResX +
468 FFMAX(global_settings->left_margin, 0);
469 }
470 /**
471 * \brief Mapping between script and screen coordinates
472 */
473 static int y2scr(double y) {
474 return y * frame_context.orig_height_nocrop / frame_context.track->PlayResY +
475 FFMAX(global_settings->top_margin, 0);
476 }
477 // the same for toptitles
478 static int y2scr_top(double y) {
479 if (global_settings->use_margins)
480 return y * frame_context.orig_height_nocrop / frame_context.track->PlayResY;
481 else
482 return y * frame_context.orig_height_nocrop / frame_context.track->PlayResY +
483 FFMAX(global_settings->top_margin, 0);
484 }
485 // the same for subtitles
486 static int y2scr_sub(double y) {
487 if (global_settings->use_margins)
488 return y * frame_context.orig_height_nocrop / frame_context.track->PlayResY +
489 FFMAX(global_settings->top_margin, 0) +
490 FFMAX(global_settings->bottom_margin, 0);
491 else
492 return y * frame_context.orig_height_nocrop / frame_context.track->PlayResY +
493 FFMAX(global_settings->top_margin, 0);
494 }
495
496 static void compute_string_bbox( text_info_t* info, FT_BBox *abbox ) {
497 FT_BBox bbox;
498 int i;
499
500 if (text_info.length > 0) {
501 bbox.xMin = 32000;
502 bbox.xMax = -32000;
503 bbox.yMin = - d6_to_int(text_info.lines[0].asc) + text_info.glyphs[0].pos.y;
504 bbox.yMax = d6_to_int(text_info.height - text_info.lines[0].asc) + text_info.glyphs[0].pos.y;
505
506 for (i = 0; i < text_info.length; ++i) {
507 int s = text_info.glyphs[i].pos.x;
508 int e = s + d6_to_int(text_info.glyphs[i].advance.x);
509 bbox.xMin = FFMIN(bbox.xMin, s);
510 bbox.xMax = FFMAX(bbox.xMax, e);
511 }
512 } else
513 bbox.xMin = bbox.xMax = bbox.yMin = bbox.yMax = 0;
514
515 /* return string bbox */
516 *abbox = bbox;
517 }
518
519
520 /**
521 * \brief Check if starting part of (*p) matches sample. If true, shift p to the first symbol after the matching part.
522 */
523 static inline int mystrcmp(char** p, const char* sample) {
524 int len = strlen(sample);
525 if (strncmp(*p, sample, len) == 0) {
526 (*p) += len;
527 return 1;
528 } else
529 return 0;
530 }
531
532 static void change_font_size(double sz)
533 {
534 double size = sz * frame_context.font_scale;
535
536 if (size < 1)
537 size = 1;
538 else if (size > frame_context.height * 2)
539 size = frame_context.height * 2;
540
541 ass_font_set_size(render_context.font, size);
542
543 render_context.font_size = sz;
544 }
545
546 /**
547 * \brief Change current font, using setting from render_context.
548 */
549 static void update_font(void)
550 {
551 unsigned val;
552 ass_renderer_t* priv = frame_context.ass_priv;
553 ass_font_desc_t desc;
554 desc.family = strdup(render_context.family);
555
556 val = render_context.bold;
557 // 0 = normal, 1 = bold, >1 = exact weight
558 if (val == 0) val = 80; // normal
559 else if (val == 1) val = 200; // bold
560 desc.bold = val;
561
562 val = render_context.italic;
563 if (val == 0) val = 0; // normal
564 else if (val == 1) val = 110; //italic
565 desc.italic = val;
566
567 render_context.font = ass_font_new(priv->library, priv->ftlibrary, priv->fontconfig_priv, &desc);
568 free(desc.family);
569
570 if (render_context.font)
571 change_font_size(render_context.font_size);
572 }
573
574 /**
575 * \brief Change border width
576 * negative value resets border to style value
577 */
578 static void change_border(double border)
579 {
580 int b;
581 if (!render_context.font) return;
582
583 if (border < 0) {
584 if (render_context.style->BorderStyle == 1)
585 border = render_context.style->Outline;
586 else
587 border = 1.;
588 }
589 render_context.border = border;
590
591 b = 64 * border * frame_context.border_scale;
592 if (b > 0) {
593 if (!render_context.stroker) {
594 int error;
595 #if (FREETYPE_MAJOR > 2) || ((FREETYPE_MAJOR == 2) && (FREETYPE_MINOR > 1))
596 error = FT_Stroker_New( ass_renderer->ftlibrary, &render_context.stroker );
597 #else // < 2.2
598 error = FT_Stroker_New( render_context.font->faces[0]->memory, &render_context.stroker );
599 #endif
600 if (error) {
601 mp_msg(MSGT_ASS, MSGL_V, "failed to get stroker\n");
602 render_context.stroker = 0;
603 }
604 }
605 if (render_context.stroker)
606 FT_Stroker_Set( render_context.stroker, b,
607 FT_STROKER_LINECAP_ROUND,
608 FT_STROKER_LINEJOIN_ROUND,
609 0 );
610 } else {
611 FT_Stroker_Done(render_context.stroker);
612 render_context.stroker = 0;
613 }
614 }
615
616 #define _r(c) ((c)>>24)
617 #define _g(c) (((c)>>16)&0xFF)
618 #define _b(c) (((c)>>8)&0xFF)
619 #define _a(c) ((c)&0xFF)
620
621 /**
622 * \brief Calculate a weighted average of two colors
623 * calculates c1*(1-a) + c2*a, but separately for each component except alpha
624 */
625 static void change_color(uint32_t* var, uint32_t new, double pwr)
626 {
627 (*var)= ((uint32_t)(_r(*var) * (1 - pwr) + _r(new) * pwr) << 24) +
628 ((uint32_t)(_g(*var) * (1 - pwr) + _g(new) * pwr) << 16) +
629 ((uint32_t)(_b(*var) * (1 - pwr) + _b(new) * pwr) << 8) +
630 _a(*var);
631 }
632
633 // like change_color, but for alpha component only
634 static void change_alpha(uint32_t* var, uint32_t new, double pwr)
635 {
636 *var = (_r(*var) << 24) + (_g(*var) << 16) + (_b(*var) << 8) + (_a(*var) * (1 - pwr) + _a(new) * pwr);
637 }
638
639 /**
640 * \brief Multiply two alpha values
641 * \param a first value
642 * \param b second value
643 * \return result of multiplication
644 * Parameters and result are limited by 0xFF.
645 */
646 static uint32_t mult_alpha(uint32_t a, uint32_t b)
647 {
648 return 0xFF - (0xFF - a) * (0xFF - b) / 0xFF;
649 }
650
651 /**
652 * \brief Calculate alpha value by piecewise linear function
653 * Used for \fad, \fade implementation.
654 */
655 static unsigned interpolate_alpha(long long now,
656 long long t1, long long t2, long long t3, long long t4,
657 unsigned a1, unsigned a2, unsigned a3)
658 {
659 unsigned a;
660 double cf;
661 if (now <= t1) {
662 a = a1;
663 } else if (now >= t4) {
664 a = a3;
665 } else if (now < t2) { // and > t1
666 cf = ((double)(now - t1)) / (t2 - t1);
667 a = a1 * (1 - cf) + a2 * cf;
668 } else if (now > t3) {
669 cf = ((double)(now - t3)) / (t4 - t3);
670 a = a2 * (1 - cf) + a3 * cf;
671 } else { // t2 <= now <= t3
672 a = a2;
673 }
674
675 return a;
676 }
677
678 static void reset_render_context(void);
679
680 /**
681 * \brief Parse style override tag.
682 * \param p string to parse
683 * \param pwr multiplier for some tag effects (comes from \t tags)
684 */
685 static char* parse_tag(char* p, double pwr) {
686 #define skip_to(x) while ((*p != (x)) && (*p != '}') && (*p != 0)) { ++p;}
687 #define skip(x) if (*p == (x)) ++p; else { return p; }
688
689 skip_to('\\');
690 skip('\\');
691 if ((*p == '}') || (*p == 0))
692 return p;
693
694 // New tags introduced in vsfilter 2.39
695 if (mystrcmp(&p, "xbord")) {
696 double val;
697 if (mystrtod(&p, &val))
698 mp_msg(MSGT_ASS, MSGL_V, "stub: \\xbord%.2f\n", val);
699 } else if (mystrcmp(&p, "ybord")) {
700 double val;
701 if (mystrtod(&p, &val))
702 mp_msg(MSGT_ASS, MSGL_V, "stub: \\ybord%.2f\n", val);
703 } else if (mystrcmp(&p, "xshad")) {
704 int val;
705 if (mystrtoi(&p, &val))
706 mp_msg(MSGT_ASS, MSGL_V, "stub: \\xshad%d\n", val);
707 } else if (mystrcmp(&p, "yshad")) {
708 int val;
709 if (mystrtoi(&p, &val))
710 mp_msg(MSGT_ASS, MSGL_V, "stub: \\yshad%d\n", val);
711 } else if (mystrcmp(&p, "fax")) {
712 int val;
713 if (mystrtoi(&p, &val))
714 mp_msg(MSGT_ASS, MSGL_V, "stub: \\fax%d\n", val);
715 } else if (mystrcmp(&p, "fay")) {
716 int val;
717 if (mystrtoi(&p, &val))
718 mp_msg(MSGT_ASS, MSGL_V, "stub: \\fay%d\n", val);
719 } else if (mystrcmp(&p, "iclip")) {
720 int x0, y0, x1, y1;
721 int res = 1;
722 skip('(');
723 res &= mystrtoi(&p, &x0);
724 skip(',');
725 res &= mystrtoi(&p, &y0);
726 skip(',');
727 res &= mystrtoi(&p, &x1);
728 skip(',');
729 res &= mystrtoi(&p, &y1);
730 skip(')');
731 mp_msg(MSGT_ASS, MSGL_V, "stub: \\iclip(%d,%d,%d,%d)\n", x0, y0, x1, y1);
732 } else if (mystrcmp(&p, "blur")) {
733 double val;
734 if (mystrtod(&p, &val)) {
735 val = (val < 0) ? 0 : val;
736 val = (val > BLUR_MAX_RADIUS) ? BLUR_MAX_RADIUS : val;
737 render_context.blur = val;
738 } else
739 render_context.blur = 0.0;
740 // ASS standard tags
741 } else if (mystrcmp(&p, "fsc")) {
742 char tp = *p++;
743 double val;
744 if (tp == 'x') {
745 if (mystrtod(&p, &val)) {
746 val /= 100;
747 render_context.scale_x = render_context.scale_x * ( 1 - pwr) + val * pwr;
748 } else
749 render_context.scale_x = render_context.style->ScaleX;
750 } else if (tp == 'y') {
751 if (mystrtod(&p, &val)) {
752 val /= 100;
753 render_context.scale_y = render_context.scale_y * ( 1 - pwr) + val * pwr;
754 } else
755 render_context.scale_y = render_context.style->ScaleY;
756 }
757 } else if (mystrcmp(&p, "fsp")) {
758 double val;
759 if (mystrtod(&p, &val))
760 render_context.hspacing = render_context.hspacing * ( 1 - pwr ) + val * pwr;
761 else
762 render_context.hspacing = render_context.style->Spacing;
763 } else if (mystrcmp(&p, "fs")) {
764 double val;
765 if (mystrtod(&p, &val))
766 val = render_context.font_size * ( 1 - pwr ) + val * pwr;
767 else
768 val = render_context.style->FontSize;
769 if (render_context.font)
770 change_font_size(val);
771 } else if (mystrcmp(&p, "bord")) {
772 double val;
773 if (mystrtod(&p, &val))
774 val = render_context.border * ( 1 - pwr ) + val * pwr;
775 else
776 val = -1.; // reset to default
777 change_border(val);
778 } else if (mystrcmp(&p, "move")) {
779 int x1, x2, y1, y2;
780 long long t1, t2, delta_t, t;
781 double x, y;
782 double k;
783 skip('(');
784 mystrtoi(&p, &x1);
785 skip(',');
786 mystrtoi(&p, &y1);
787 skip(',');
788 mystrtoi(&p, &x2);
789 skip(',');
790 mystrtoi(&p, &y2);
791 if (*p == ',') {
792 skip(',');
793 mystrtoll(&p, &t1);
794 skip(',');
795 mystrtoll(&p, &t2);
796 mp_msg(MSGT_ASS, MSGL_DBG2, "movement6: (%d, %d) -> (%d, %d), (%" PRId64 " .. %" PRId64 ")\n",
797 x1, y1, x2, y2, (int64_t)t1, (int64_t)t2);
798 } else {
799 t1 = 0;
800 t2 = render_context.event->Duration;
801 mp_msg(MSGT_ASS, MSGL_DBG2, "movement: (%d, %d) -> (%d, %d)\n", x1, y1, x2, y2);
802 }
803 skip(')');
804 delta_t = t2 - t1;
805 t = frame_context.time - render_context.event->Start;
806 if (t < t1)
807 k = 0.;
808 else if (t > t2)
809 k = 1.;
810 else k = ((double)(t - t1)) / delta_t;
811 x = k * (x2 - x1) + x1;
812 y = k * (y2 - y1) + y1;
813 if (render_context.evt_type != EVENT_POSITIONED) {
814 render_context.pos_x = x;
815 render_context.pos_y = y;
816 render_context.detect_collisions = 0;
817 render_context.evt_type = EVENT_POSITIONED;
818 }
819 } else if (mystrcmp(&p, "frx")) {
820 double val;
821 if (mystrtod(&p, &val)) {
822 val *= M_PI / 180;
823 render_context.frx = val * pwr + render_context.frx * (1-pwr);
824 } else
825 render_context.frx = 0.;
826 } else if (mystrcmp(&p, "fry")) {
827 double val;
828 if (mystrtod(&p, &val)) {
829 val *= M_PI / 180;
830 render_context.fry = val * pwr + render_context.fry * (1-pwr);
831 } else
832 render_context.fry = 0.;
833 } else if (mystrcmp(&p, "frz") || mystrcmp(&p, "fr")) {
834 double val;
835 if (mystrtod(&p, &val)) {
836 val *= M_PI / 180;
837 render_context.frz = val * pwr + render_context.frz * (1-pwr);
838 } else
839 render_context.frz = M_PI * render_context.style->Angle / 180.;
840 } else if (mystrcmp(&p, "fn")) {
841 char* start = p;
842 char* family;
843 skip_to('\\');
844 if (p > start) {
845 family = malloc(p - start + 1);
846 strncpy(family, start, p - start);
847 family[p - start] = '\0';
848 } else
849 family = strdup(render_context.style->FontName);
850 if (render_context.family)
851 free(render_context.family);
852 render_context.family = family;
853 update_font();
854 } else if (mystrcmp(&p, "alpha")) {
855 uint32_t val;
856 int i;
857 if (strtocolor(&p, &val)) {
858 unsigned char a = val >> 24;
859 for (i = 0; i < 4; ++i)
860 change_alpha(&render_context.c[i], a, pwr);
861 } else {
862 change_alpha(&render_context.c[0], render_context.style->PrimaryColour, pwr);
863 change_alpha(&render_context.c[1], render_context.style->SecondaryColour, pwr);
864 change_alpha(&render_context.c[2], render_context.style->OutlineColour, pwr);
865 change_alpha(&render_context.c[3], render_context.style->BackColour, pwr);
866 }
867 // FIXME: simplify
868 } else if (mystrcmp(&p, "an")) {
869 int val;
870 if (mystrtoi(&p, &val) && val) {
871 int v = (val - 1) / 3; // 0, 1 or 2 for vertical alignment
872 mp_msg(MSGT_ASS, MSGL_DBG2, "an %d\n", val);
873 if (v != 0) v = 3 - v;
874 val = ((val - 1) % 3) + 1; // horizontal alignment
875 val += v*4;
876 mp_msg(MSGT_ASS, MSGL_DBG2, "align %d\n", val);
877 render_context.alignment = val;
878 } else
879 render_context.alignment = render_context.style->Alignment;
880 } else if (mystrcmp(&p, "a")) {
881 int val;
882 if (mystrtoi(&p, &val) && val)
883 render_context.alignment = val;
884 else
885 render_context.alignment = render_context.style->Alignment;
886 } else if (mystrcmp(&p, "pos")) {
887 int v1, v2;
888 skip('(');
889 mystrtoi(&p, &v1);
890 skip(',');
891 mystrtoi(&p, &v2);
892 skip(')');
893 mp_msg(MSGT_ASS, MSGL_DBG2, "pos(%d, %d)\n", v1, v2);
894 if (render_context.evt_type == EVENT_POSITIONED) {
895 mp_msg(MSGT_ASS, MSGL_V, "Subtitle has a new \\pos "
896 "after \\move or \\pos, ignoring\n");
897 } else {
898 render_context.evt_type = EVENT_POSITIONED;
899 render_context.detect_collisions = 0;
900 render_context.pos_x = v1;
901 render_context.pos_y = v2;
902 }
903 } else if (mystrcmp(&p, "fad")) {
904 int a1, a2, a3;
905 long long t1, t2, t3, t4;
906 if (*p == 'e') ++p; // either \fad or \fade
907 skip('(');
908 mystrtoi(&p, &a1);
909 skip(',');
910 mystrtoi(&p, &a2);
911 if (*p == ')') {
912 // 2-argument version (\fad, according to specs)
913 // a1 and a2 are fade-in and fade-out durations
914 t1 = 0;
915 t4 = render_context.event->Duration;
916 t2 = a1;
917 t3 = t4 - a2;
918 a1 = 0xFF;
919 a2 = 0;
920 a3 = 0xFF;
921 } else {
922 // 6-argument version (\fade)
923 // a1 and a2 (and a3) are opacity values
924 skip(',');
925 mystrtoi(&p, &a3);
926 skip(',');
927 mystrtoll(&p, &t1);
928 skip(',');
929 mystrtoll(&p, &t2);
930 skip(',');
931 mystrtoll(&p, &t3);
932 skip(',');
933 mystrtoll(&p, &t4);
934 }
935 skip(')');
936 render_context.fade = interpolate_alpha(frame_context.time - render_context.event->Start, t1, t2, t3, t4, a1, a2, a3);
937 } else if (mystrcmp(&p, "org")) {
938 int v1, v2;
939 skip('(');
940 mystrtoi(&p, &v1);
941 skip(',');
942 mystrtoi(&p, &v2);
943 skip(')');
944 mp_msg(MSGT_ASS, MSGL_DBG2, "org(%d, %d)\n", v1, v2);
945 // render_context.evt_type = EVENT_POSITIONED;
946 render_context.org_x = v1;
947 render_context.org_y = v2;
948 render_context.have_origin = 1;
949 render_context.detect_collisions = 0;
950 } else if (mystrcmp(&p, "t")) {
951 double v[3];
952 int v1, v2;
953 double v3;
954 int cnt;
955 long long t1, t2, t, delta_t;
956 double k;
957 skip('(');
958 for (cnt = 0; cnt < 3; ++cnt) {
959 if (*p == '\\')
960 break;
961 v[cnt] = strtod(p, &p);
962 skip(',');
963 }
964 if (cnt == 3) {
965 v1 = v[0]; v2 = v[1]; v3 = v[2];
966 } else if (cnt == 2) {
967 v1 = v[0]; v2 = v[1]; v3 = 1.;
968 } else if (cnt == 1) {
969 v1 = 0; v2 = render_context.event->Duration; v3 = v[0];
970 } else { // cnt == 0
971 v1 = 0; v2 = render_context.event->Duration; v3 = 1.;
972 }
973 render_context.detect_collisions = 0;
974 t1 = v1;
975 t2 = v2;
976 delta_t = v2 - v1;
977 if (v3 < 0.)
978 v3 = 0.;
979 t = frame_context.time - render_context.event->Start; // FIXME: move to render_context
980 if (t <= t1)
981 k = 0.;
982 else if (t >= t2)
983 k = 1.;
984 else {
985 assert(delta_t != 0.);
986 k = pow(((double)(t - t1)) / delta_t, v3);
987 }
988 while (*p == '\\')
989 p = parse_tag(p, k); // maybe k*pwr ? no, specs forbid nested \t's
990 skip_to(')'); // in case there is some unknown tag or a comment
991 skip(')');
992 } else if (mystrcmp(&p, "clip")) {
993 int x0, y0, x1, y1;
994 int res = 1;
995 skip('(');
996 res &= mystrtoi(&p, &x0);
997 skip(',');
998 res &= mystrtoi(&p, &y0);
999 skip(',');
1000 res &= mystrtoi(&p, &x1);
1001 skip(',');
1002 res &= mystrtoi(&p, &y1);
1003 skip(')');
1004 if (res) {
1005 render_context.clip_x0 = render_context.clip_x0 * (1-pwr) + x0 * pwr;
1006 render_context.clip_x1 = render_context.clip_x1 * (1-pwr) + x1 * pwr;
1007 render_context.clip_y0 = render_context.clip_y0 * (1-pwr) + y0 * pwr;
1008 render_context.clip_y1 = render_context.clip_y1 * (1-pwr) + y1 * pwr;
1009 } else {
1010 render_context.clip_x0 = 0;
1011 render_context.clip_y0 = 0;
1012 render_context.clip_x1 = frame_context.track->PlayResX;
1013 render_context.clip_y1 = frame_context.track->PlayResY;
1014 }
1015 } else if (mystrcmp(&p, "c")) {
1016 uint32_t val;
1017 if (!strtocolor(&p, &val))
1018 val = render_context.style->PrimaryColour;
1019 mp_msg(MSGT_ASS, MSGL_DBG2, "color: %X\n", val);
1020 change_color(&render_context.c[0], val, pwr);
1021 } else if ((*p >= '1') && (*p <= '4') && (++p) && (mystrcmp(&p, "c") || mystrcmp(&p, "a"))) {
1022 char n = *(p-2);
1023 int cidx = n - '1';
1024 char cmd = *(p-1);
1025 uint32_t val;
1026 assert((n >= '1') && (n <= '4'));
1027 if (!strtocolor(&p, &val))
1028 switch(n) {
1029 case '1': val = render_context.style->PrimaryColour; break;
1030 case '2': val = render_context.style->SecondaryColour; break;
1031 case '3': val = render_context.style->OutlineColour; break;
1032 case '4': val = render_context.style->BackColour; break;
1033 default : val = 0; break; // impossible due to assert; avoid compilation warning
1034 }
1035 switch (cmd) {
1036 case 'c': change_color(render_context.c + cidx, val, pwr); break;
1037 case 'a': change_alpha(render_context.c + cidx, val >> 24, pwr); break;
1038 default: mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_BadCommand, n, cmd); break;
1039 }
1040 mp_msg(MSGT_ASS, MSGL_DBG2, "single c/a at %f: %c%c = %X \n", pwr, n, cmd, render_context.c[cidx]);
1041 } else if (mystrcmp(&p, "r")) {
1042 reset_render_context();
1043 } else if (mystrcmp(&p, "be")) {
1044 int val;
1045 if (mystrtoi(&p, &val)) {
1046 // Clamp to 10, since high values need excessive CPU
1047 val = (val < 0) ? 0 : val;
1048 val = (val > 10) ? 10 : val;
1049 render_context.be = val;
1050 } else
1051 render_context.be = 0;
1052 } else if (mystrcmp(&p, "b")) {
1053 int b;
1054 if (mystrtoi(&p, &b)) {
1055 if (pwr >= .5)
1056 render_context.bold = b;
1057 } else
1058 render_context.bold = render_context.style->Bold;
1059 update_font();
1060 } else if (mystrcmp(&p, "i")) {
1061 int i;
1062 if (mystrtoi(&p, &i)) {
1063 if (pwr >= .5)
1064 render_context.italic = i;
1065 } else
1066 render_context.italic = render_context.style->Italic;
1067 update_font();
1068 } else if (mystrcmp(&p, "kf") || mystrcmp(&p, "K")) {
1069 int val = 0;
1070 mystrtoi(&p, &val);
1071 render_context.effect_type = EF_KARAOKE_KF;
1072 if (render_context.effect_timing)
1073 render_context.effect_skip_timing += render_context.effect_timing;
1074 render_context.effect_timing = val * 10;
1075 } else if (mystrcmp(&p, "ko")) {
1076 int val = 0;
1077 mystrtoi(&p, &val);
1078 render_context.effect_type = EF_KARAOKE_KO;
1079 if (render_context.effect_timing)
1080 render_context.effect_skip_timing += render_context.effect_timing;
1081 render_context.effect_timing = val * 10;
1082 } else if (mystrcmp(&p, "k")) {
1083 int val = 0;
1084 mystrtoi(&p, &val);
1085 render_context.effect_type = EF_KARAOKE;
1086 if (render_context.effect_timing)
1087 render_context.effect_skip_timing += render_context.effect_timing;
1088 render_context.effect_timing = val * 10;
1089 } else if (mystrcmp(&p, "shad")) {
1090 int val;
1091 if (mystrtoi(&p, &val))
1092 render_context.shadow = val;
1093 else
1094 render_context.shadow = render_context.style->Shadow;
1095 } else if (mystrcmp(&p, "pbo")) {
1096 int val = 0;
1097 mystrtoi(&p, &val); // ignored
1098 } else if (mystrcmp(&p, "p")) {
1099 int val;
1100 if (!mystrtoi(&p, &val))
1101 val = 0;
1102 render_context.drawing_mode = !!val;
1103 }
1104
1105 return p;
1106
1107 #undef skip
1108 #undef skip_to
1109 }
1110
1111 /**
1112 * \brief Get next ucs4 char from string, parsing and executing style overrides
1113 * \param str string pointer
1114 * \return ucs4 code of the next char
1115 * On return str points to the unparsed part of the string
1116 */
1117 static unsigned get_next_char(char** str)
1118 {
1119 char* p = *str;
1120 unsigned chr;
1121 if (*p == '{') { // '\0' goes here
1122 p++;
1123 while (1) {
1124 p = parse_tag(p, 1.);
1125 if (*p == '}') { // end of tag
1126 p++;
1127 if (*p == '{') {
1128 p++;
1129 continue;
1130 } else
1131 break;
1132 } else if (*p != '\\')
1133 mp_msg(MSGT_ASS, MSGL_V, "Unable to parse: \"%s\" \n", p);
1134 if (*p == 0)
1135 break;
1136 }
1137 }
1138 if (*p == '\t') {
1139 ++p;
1140 *str = p;
1141 return ' ';
1142 }
1143 if (*p == '\\') {
1144 if ((*(p+1) == 'N') || ((*(p+1) == 'n') && (frame_context.track->WrapStyle == 2))) {
1145 p += 2;
1146 *str = p;
1147 return '\n';
1148 } else if ((*(p+1) == 'n') || (*(p+1) == 'h')) {
1149 p += 2;
1150 *str = p;
1151 return ' ';
1152 }
1153 }
1154 chr = utf8_get_char((const char **)&p);
1155 *str = p;
1156 return chr;
1157 }
1158
1159 static void apply_transition_effects(ass_event_t* event)
1160 {
1161 int v[4];
1162 int cnt;
1163 char* p = event->Effect;
1164
1165 if (!p || !*p) return;
1166
1167 cnt = 0;
1168 while (cnt < 4 && (p = strchr(p, ';'))) {
1169 v[cnt++] = atoi(++p);
1170 }
1171
1172 if (strncmp(event->Effect, "Banner;", 7) == 0) {
1173 int delay;
1174 if (cnt < 1) {
1175 mp_msg(MSGT_ASS, MSGL_V, "Error parsing effect: %s \n", event->Effect);
1176 return;
1177 }
1178 if (cnt >= 2 && v[1] == 0) // right-to-left
1179 render_context.scroll_direction = SCROLL_RL;
1180 else // left-to-right
1181 render_context.scroll_direction = SCROLL_LR;
1182
1183 delay = v[0];
1184 if (delay == 0) delay = 1; // ?
1185 render_context.scroll_shift = (frame_context.time - render_context.event->Start) / delay;
1186 render_context.evt_type = EVENT_HSCROLL;
1187 return;
1188 }
1189
1190 if (strncmp(event->Effect, "Scroll up;", 10) == 0) {
1191 render_context.scroll_direction = SCROLL_BT;
1192 } else if (strncmp(event->Effect, "Scroll down;", 12) == 0) {
1193 render_context.scroll_direction = SCROLL_TB;
1194 } else {
1195 mp_msg(MSGT_ASS, MSGL_V, "Unknown transition effect: %s \n", event->Effect);
1196 return;
1197 }
1198 // parse scroll up/down parameters
1199 {
1200 int delay;
1201 int y0, y1;
1202 if (cnt < 3) {
1203 mp_msg(MSGT_ASS, MSGL_V, "Error parsing effect: %s \n", event->Effect);
1204 return;
1205 }
1206 delay = v[2];
1207 if (delay == 0) delay = 1; // ?
1208 render_context.scroll_shift = (frame_context.time - render_context.event->Start) / delay;
1209 if (v[0] < v[1]) {
1210 y0 = v[0]; y1 = v[1];
1211 } else {
1212 y0 = v[1]; y1 = v[0];
1213 }
1214 if (y1 == 0)
1215 y1 = frame_context.track->PlayResY; // y0=y1=0 means fullscreen scrolling
1216 render_context.clip_y0 = y0;
1217 render_context.clip_y1 = y1;
1218 render_context.evt_type = EVENT_VSCROLL;
1219 render_context.detect_collisions = 0;
1220 }
1221
1222 }
1223
1224 /**
1225 * \brief partially reset render_context to style values
1226 * Works like {\r}: resets some style overrides
1227 */
1228 static void reset_render_context(void)
1229 {
1230 render_context.c[0] = render_context.style->PrimaryColour;
1231 render_context.c[1] = render_context.style->SecondaryColour;
1232 render_context.c[2] = render_context.style->OutlineColour;
1233 render_context.c[3] = render_context.style->BackColour;
1234 render_context.font_size = render_context.style->FontSize;
1235
1236 if (render_context.family)
1237 free(render_context.family);
1238 render_context.family = strdup(render_context.style->FontName);
1239 render_context.bold = render_context.style->Bold;
1240 render_context.italic = render_context.style->Italic;
1241 update_font();
1242
1243 change_border(-1.);
1244 render_context.scale_x = render_context.style->ScaleX;
1245 render_context.scale_y = render_context.style->ScaleY;
1246 render_context.hspacing = render_context.style->Spacing;
1247 render_context.be = 0;
1248 render_context.blur = 0.0;
1249 render_context.shadow = render_context.style->Shadow;
1250 render_context.frx = render_context.fry = 0.;
1251 render_context.frz = M_PI * render_context.style->Angle / 180.;
1252
1253 // FIXME: does not reset unsupported attributes.
1254 }
1255
1256 /**
1257 * \brief Start new event. Reset render_context.
1258 */
1259 static void init_render_context(ass_event_t* event)
1260 {
1261 render_context.event = event;
1262 render_context.style = frame_context.track->styles + event->Style;
1263
1264 reset_render_context();
1265
1266 render_context.evt_type = EVENT_NORMAL;
1267 render_context.alignment = render_context.style->Alignment;
1268 render_context.pos_x = 0;
1269 render_context.pos_y = 0;
1270 render_context.org_x = 0;
1271 render_context.org_y = 0;
1272 render_context.have_origin = 0;
1273 render_context.clip_x0 = 0;
1274 render_context.clip_y0 = 0;
1275 render_context.clip_x1 = frame_context.track->PlayResX;
1276 render_context.clip_y1 = frame_context.track->PlayResY;
1277 render_context.detect_collisions = 1;
1278 render_context.fade = 0;
1279 render_context.drawing_mode = 0;
1280 render_context.effect_type = EF_NONE;
1281 render_context.effect_timing = 0;
1282 render_context.effect_skip_timing = 0;
1283
1284 apply_transition_effects(event);
1285 }
1286
1287 static void free_render_context(void)
1288 {
1289 }
1290
1291 /**
1292 * \brief Get normal and outline (border) glyphs
1293 * \param symbol ucs4 char
1294 * \param info out: struct filled with extracted data
1295 * \param advance subpixel shift vector used for cache lookup
1296 * Tries to get both glyphs from cache.
1297 * If they can't be found, gets a glyph from font face, generates outline with FT_Stroker,
1298 * and add them to cache.
1299 * The glyphs are returned in info->glyph and info->outline_glyph
1300 */
1301 static void get_outline_glyph(int symbol, glyph_info_t* info, FT_Vector* advance)
1302 {
1303 int error;
1304 glyph_hash_val_t* val;
1305 glyph_hash_key_t key;
1306 key.font = render_context.font;
1307 key.size = render_context.font_size;
1308 key.ch = symbol;
1309 key.scale_x = (render_context.scale_x * 0xFFFF);
1310 key.scale_y = (render_context.scale_y * 0xFFFF);
1311 key.advance = *advance;
1312 key.bold = render_context.bold;
1313 key.italic = render_context.italic;
1314 key.outline = render_context.border * 0xFFFF;
1315
1316 memset(info, 0, sizeof(glyph_info_t));
1317
1318 val = cache_find_glyph(&key);
1319 if (val) {
1320 FT_Glyph_Copy(val->glyph, &info->glyph);
1321 if (val->outline_glyph)
1322 FT_Glyph_Copy(val->outline_glyph, &info->outline_glyph);
1323 info->bbox = val->bbox_scaled;
1324 info->advance.x = val->advance.x;
1325 info->advance.y = val->advance.y;
1326 } else {
1327 glyph_hash_val_t v;
1328 info->glyph = ass_font_get_glyph(frame_context.ass_priv->fontconfig_priv, render_context.font, symbol, global_settings->hinting);
1329 if (!info->glyph)
1330 return;
1331 info->advance.x = d16_to_d6(info->glyph->advance.x);
1332 info->advance.y = d16_to_d6(info->glyph->advance.y);
1333 FT_Glyph_Get_CBox( info->glyph, FT_GLYPH_BBOX_PIXELS, &info->bbox);
1334
1335 if (render_context.stroker) {
1336 info->outline_glyph = info->glyph;
1337 error = FT_Glyph_StrokeBorder( &(info->outline_glyph), render_context.stroker, 0 , 0 ); // don't destroy original
1338 if (error) {
1339 mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_FT_Glyph_Stroke_Error, error);
1340 }
1341 }
1342
1343 memset(&v, 0, sizeof(v));
1344 FT_Glyph_Copy(info->glyph, &v.glyph);
1345 if (info->outline_glyph)
1346 FT_Glyph_Copy(info->outline_glyph, &v.outline_glyph);
1347 v.advance = info->advance;
1348 v.bbox_scaled = info->bbox;
1349 cache_add_glyph(&key, &v);
1350 }
1351 }
1352
1353 static void transform_3d(FT_Vector shift, FT_Glyph* glyph, FT_Glyph* glyph2, double frx, double fry, double frz);
1354
1355 /**
1356 * \brief Get bitmaps for a glyph
1357 * \param info glyph info
1358 * Tries to get glyph bitmaps from bitmap cache.
1359 * If they can't be found, they are generated by rotating and rendering the glyph.
1360 * After that, bitmaps are added to the cache.
1361 * They are returned in info->bm (glyph), info->bm_o (outline) and info->bm_s (shadow).
1362 */
1363 static void get_bitmap_glyph(glyph_info_t* info)
1364 {
1365 bitmap_hash_val_t* val;
1366 bitmap_hash_key_t* key = &info->hash_key;
1367
1368 val = cache_find_bitmap(key);
1369 /* val = 0; */
1370
1371 if (val) {
1372 info->bm = val->bm;
1373 info->bm_o = val->bm_o;
1374 info->bm_s = val->bm_s;
1375 } else {
1376 FT_Vector shift;
1377 bitmap_hash_val_t hash_val;
1378 int error;
1379 info->bm = info->bm_o = info->bm_s = 0;
1380 if (info->glyph && info->symbol != '\n' && info->symbol != 0) {
1381 // calculating rotation shift vector (from rotation origin to the glyph basepoint)
1382 shift.x = int_to_d6(info->hash_key.shift_x);
1383 shift.y = int_to_d6(info->hash_key.shift_y);
1384 // apply rotation
1385 transform_3d(shift, &info->glyph, &info->outline_glyph, info->frx, info->fry, info->frz);
1386
1387 // render glyph
1388 error = glyph_to_bitmap(ass_renderer->synth_priv,
1389 ass_renderer->synth_priv_blur,
1390 info->glyph, info->outline_glyph,
1391 &info->bm, &info->bm_o,
1392 &info->bm_s, info->be, info->blur);
1393 if (error)
1394 info->symbol = 0;
1395
1396 // add bitmaps to cache
1397 hash_val.bm_o = info->bm_o;
1398 hash_val.bm = info->bm;
1399 hash_val.bm_s = info->bm_s;
1400 cache_add_bitmap(&(info->hash_key), &hash_val);
1401 }
1402 }
1403 // deallocate glyphs
1404 if (info->glyph)
1405 FT_Done_Glyph(info->glyph);
1406 if (info->outline_glyph)
1407 FT_Done_Glyph(info->outline_glyph);
1408 }
1409
1410 /**
1411 * This function goes through text_info and calculates text parameters.
1412 * The following text_info fields are filled:
1413 * height
1414 * lines[].height
1415 * lines[].asc
1416 * lines[].desc
1417 */
1418 static void measure_text(void)
1419 {
1420 int cur_line = 0, max_asc = 0, max_desc = 0;
1421 int i;
1422 text_info.height = 0;
1423 for (i = 0; i < text_info.length + 1; ++i) {
1424 if ((i == text_info.length) || text_info.glyphs[i].linebreak) {
1425 text_info.lines[cur_line].asc = max_asc;
1426 text_info.lines[cur_line].desc = max_desc;
1427 text_info.height += max_asc + max_desc;
1428 cur_line ++;
1429 max_asc = max_desc = 0;
1430 }
1431 if (i < text_info.length) {
1432 glyph_info_t* cur = text_info.glyphs + i;
1433 if (cur->asc > max_asc)
1434 max_asc = cur->asc;
1435 if (cur->desc > max_desc)
1436 max_desc = cur->desc;
1437 }
1438 }
1439 text_info.height += (text_info.n_lines - 1) * double_to_d6(global_settings->line_spacing);
1440 }
1441
1442 /**
1443 * \brief rearrange text between lines
1444 * \param max_text_width maximal text line width in pixels
1445 * The algo is similar to the one in libvo/sub.c:
1446 * 1. Place text, wrapping it when current line is full
1447 * 2. Try moving words from the end of a line to the beginning of the next one while it reduces
1448 * the difference in lengths between this two lines.
1449 * The result may not be optimal, but usually is good enough.
1450 */
1451 static void wrap_lines_smart(int max_text_width)
1452 {
1453 int i, j;
1454 glyph_info_t *cur, *s1, *e1, *s2, *s3, *w;
1455 int last_space;
1456 int break_type;
1457 int exit;
1458 int pen_shift_x;
1459 int pen_shift_y;
1460 int cur_line;
1461
1462 last_space = -1;
1463 text_info.n_lines = 1;
1464 break_type = 0;
1465 s1 = text_info.glyphs; // current line start
1466 for (i = 0; i < text_info.length; ++i) {
1467 int break_at, s_offset, len;
1468 cur = text_info.glyphs + i;
1469 break_at = -1;
1470 s_offset = s1->bbox.xMin + s1->pos.x;
1471 len = (cur->bbox.xMax + cur->pos.x) - s_offset;
1472
1473 if (cur->symbol == '\n') {
1474 break_type = 2;
1475 break_at = i;
1476 mp_msg(MSGT_ASS, MSGL_DBG2, "forced line break at %d\n", break_at);
1477 }
1478
1479 if (len >= max_text_width) {
1480 break_type = 1;
1481 break_at = last_space;
1482 if (break_at == -1)
1483 break_at = i - 1;
1484 if (break_at == -1)
1485 break_at = 0;
1486 mp_msg(MSGT_ASS, MSGL_DBG2, "overfill at %d\n", i);
1487 mp_msg(MSGT_ASS, MSGL_DBG2, "line break at %d\n", break_at);
1488 }
1489
1490 if (break_at != -1) {
1491 // need to use one more line
1492 // marking break_at+1 as start of a new line
1493 int lead = break_at + 1; // the first symbol of the new line
1494 if (text_info.n_lines >= MAX_LINES) {
1495 // to many lines !
1496 // no more linebreaks
1497 for (j = lead; j < text_info.length; ++j)
1498 text_info.glyphs[j].linebreak = 0;
1499 break;
1500 }
1501 if (lead < text_info.length)
1502 text_info.glyphs[lead].linebreak = break_type;
1503 last_space = -1;
1504 s1 = text_info.glyphs + lead;
1505 s_offset = s1->bbox.xMin + s1->pos.x;
1506 text_info.n_lines ++;
1507 }
1508
1509 if (cur->symbol == ' ')
1510 last_space = i;
1511
1512 // make sure the hard linebreak is not forgotten when
1513 // there was a new soft linebreak just inserted
1514 if (cur->symbol == '\n' && break_type == 1)
1515 i--;
1516 }
1517 #define DIFF(x,y) (((x) < (y)) ? (y - x) : (x - y))
1518 exit = 0;
1519 while (!exit) {
1520 exit = 1;
1521 w = s3 = text_info.glyphs;
1522 s1 = s2 = 0;
1523 for (i = 0; i <= text_info.length; ++i) {
1524 cur = text_info.glyphs + i;
1525 if ((i == text_info.length) || cur->linebreak) {
1526 s1 = s2;
1527 s2 = s3;
1528 s3 = cur;
1529 if (s1 && (s2->linebreak == 1)) { // have at least 2 lines, and linebreak is 'soft'
1530 int l1, l2, l1_new, l2_new;
1531
1532 w = s2;
1533 do { --w; } while ((w > s1) && (w->symbol == ' '));
1534 while ((w > s1) && (w->symbol != ' ')) { --w; }
1535 e1 = w;
1536 while ((e1 > s1) && (e1->symbol == ' ')) { --e1; }
1537 if (w->symbol == ' ') ++w;
1538
1539 l1 = ((s2-1)->bbox.xMax + (s2-1)->pos.x) - (s1->bbox.xMin + s1->pos.x);
1540 l2 = ((s3-1)->bbox.xMax + (s3-1)->pos.x) - (s2->bbox.xMin + s2->pos.x);
1541 l1_new = (e1->bbox.xMax + e1->pos.x) - (s1->bbox.xMin + s1->pos.x);
1542 l2_new = ((s3-1)->bbox.xMax + (s3-1)->pos.x) - (w->bbox.xMin + w->pos.x);
1543
1544 if (DIFF(l1_new, l2_new) < DIFF(l1, l2)) {
1545 w->linebreak = 1;
1546 s2->linebreak = 0;
1547 exit = 0;
1548 }
1549 }
1550 }
1551 if (i == text_info.length)
1552 break;
1553 }
1554
1555 }
1556 assert(text_info.n_lines >= 1);
1557 #undef DIFF
1558
1559 measure_text();
1560
1561 pen_shift_x = 0;
1562 pen_shift_y = 0;
1563 cur_line = 1;
1564 for (i = 0; i < text_info.length; ++i) {
1565 cur = text_info.glyphs + i;
1566 if (cur->linebreak) {
1567 int height = text_info.lines[cur_line - 1].desc + text_info.lines[cur_line].asc;
1568 cur_line ++;
1569 pen_shift_x = - cur->pos.x;
1570 pen_shift_y += d6_to_int(height + double_to_d6(global_settings->line_spacing));
1571 mp_msg(MSGT_ASS, MSGL_DBG2, "shifting from %d to %d by (%d, %d)\n", i, text_info.length - 1, pen_shift_x, pen_shift_y);
1572 }
1573 cur->pos.x += pen_shift_x;
1574 cur->pos.y += pen_shift_y;
1575 }
1576 }
1577
1578 /**
1579 * \brief determine karaoke effects
1580 * Karaoke effects cannot be calculated during parse stage (get_next_char()),
1581 * so they are done in a separate step.
1582 * Parse stage: when karaoke style override is found, its parameters are stored in the next glyph's
1583 * (the first glyph of the karaoke word)'s effect_type and effect_timing.
1584 * This function:
1585 * 1. sets effect_type for all glyphs in the word (_karaoke_ word)
1586 * 2. sets effect_timing for all glyphs to x coordinate of the border line between the left and right karaoke parts
1587 * (left part is filled with PrimaryColour, right one - with SecondaryColour).
1588 */
1589 static void process_karaoke_effects(void)
1590 {
1591 glyph_info_t *cur, *cur2;
1592 glyph_info_t *s1, *e1; // start and end of the current word
1593 glyph_info_t *s2; // start of the next word
1594 int i;
1595 int timing; // current timing
1596 int tm_start, tm_end; // timings at start and end of the current word
1597 int tm_current;
1598 double dt;
1599 int x;
1600 int x_start, x_end;
1601
1602 tm_current = frame_context.time - render_context.event->Start;
1603 timing = 0;
1604 s1 = s2 = 0;
1605 for (i = 0; i <= text_info.length; ++i) {
1606 cur = text_info.glyphs + i;
1607 if ((i == text_info.length) || (cur->effect_type != EF_NONE)) {
1608 s1 = s2;
1609 s2 = cur;
1610 if (s1) {
1611 e1 = s2 - 1;
1612 tm_start = timing + s1->effect_skip_timing;
1613 tm_end = tm_start + s1->effect_timing;
1614 timing = tm_end;
1615 x_start = 1000000;
1616 x_end = -1000000;
1617 for (cur2 = s1; cur2 <= e1; ++cur2) {
1618 x_start = FFMIN(x_start, cur2->bbox.xMin + cur2->pos.x);
1619 x_end = FFMAX(x_end, cur2->bbox.xMax + cur2->pos.x);
1620 }
1621
1622 dt = (tm_current - tm_start);
1623 if ((s1->effect_type == EF_KARAOKE) || (s1->effect_type == EF_KARAOKE_KO)) {
1624 if (dt > 0)
1625 x = x_end + 1;
1626 else
1627 x = x_start;
1628 } else if (s1->effect_type == EF_KARAOKE_KF) {
1629 dt /= (tm_end - tm_start);
1630 x = x_start + (x_end - x_start) * dt;
1631 } else {
1632 mp_msg(MSGT_ASS, MSGL_ERR, MSGTR_LIBASS_UnknownEffectType_InternalError);
1633 continue;
1634 }
1635
1636 for (cur2 = s1; cur2 <= e1; ++cur2) {
1637 cur2->effect_type = s1->effect_type;
1638 cur2->effect_timing = x - cur2->pos.x;
1639 }
1640 }
1641 }
1642 }
1643 }
1644
1645 /**
1646 * \brief Calculate base point for positioning and rotation
1647 * \param bbox text bbox
1648 * \param alignment alignment
1649 * \param bx, by out: base point coordinates
1650 */
1651 static void get_base_point(FT_BBox bbox, int alignment, int* bx, int* by)
1652 {
1653 const int halign = alignment & 3;
1654 const int valign = alignment & 12;
1655 if (bx)
1656 switch(halign) {
1657 case HALIGN_LEFT:
1658 *bx = bbox.xMin;
1659 break;
1660 case HALIGN_CENTER:
1661 *bx = (bbox.xMax + bbox.xMin) / 2;
1662 break;
1663 case HALIGN_RIGHT:
1664 *bx = bbox.xMax;
1665 break;
1666 }
1667 if (by)
1668 switch(valign) {
1669 case VALIGN_TOP:
1670 *by = bbox.yMin;
1671 break;
1672 case VALIGN_CENTER:
1673 *by = (bbox.yMax + bbox.yMin) / 2;
1674 break;
1675 case VALIGN_SUB:
1676 *by = bbox.yMax;
1677 break;
1678 }
1679 }
1680
1681 /**
1682 * \brief Multiply 4-vector by 4-matrix
1683 * \param a 4-vector
1684 * \param m 4-matrix]
1685 * \param b out: 4-vector
1686 * Calculates a * m and stores result in b
1687 */
1688 static inline void transform_point_3d(double *a, double *m, double *b)
1689 {
1690 b[0] = a[0] * m[0] + a[1] * m[4] + a[2] * m[8] + a[3] * m[12];
1691 b[1] = a[0] * m[1] + a[1] * m[5] + a[2] * m[9] + a[3] * m[13];
1692 b[2] = a[0] * m[2] + a[1] * m[6] + a[2] * m[10] + a[3] * m[14];
1693 b[3] = a[0] * m[3] + a[1] * m[7] + a[2] * m[11] + a[3] * m[15];
1694 }
1695
1696 /**
1697 * \brief Apply 3d transformation to a vector
1698 * \param v FreeType vector (2d)
1699 * \param m 4-matrix
1700 * Transforms v by m, projects the result back to the screen plane
1701 * Result is returned in v.
1702 */
1703 static inline void transform_vector_3d(FT_Vector* v, double *m) {
1704 const double camera = 2500 * frame_context.border_scale; // camera distance
1705 const double cutoff_z = 10.;
1706 double a[4], b[4];
1707 a[0] = d6_to_double(v->x);
1708 a[1] = d6_to_double(v->y);
1709 a[2] = 0.;
1710 a[3] = 1.;
1711 transform_point_3d(a, m, b);
1712 /* Apply perspective projection with the following matrix:
1713 2500 0 0 0
1714 0 2500 0 0
1715 0 0 0 0
1716 0 0 8 2500
1717 where 2500 is camera distance, 8 - z-axis scale.
1718 Camera is always located in (org_x, org_y, -2500). This means
1719 that different subtitle events can be displayed at the same time
1720 using different cameras. */
1721 b[0] *= camera;
1722 b[1] *= camera;
1723 b[3] = 8 * b[2] + camera;
1724 if (b[3] < cutoff_z)
1725 b[3] = cutoff_z;
1726 v->x = double_to_d6(b[0] / b[3]);
1727 v->y = double_to_d6(b[1] / b[3]);
1728 }
1729
1730 /**
1731 * \brief Apply 3d transformation to a glyph
1732 * \param glyph FreeType glyph
1733 * \param m 4-matrix
1734 * Transforms glyph by m, projects the result back to the screen plane
1735 * Result is returned in glyph.
1736 */
1737 static inline void transform_glyph_3d(FT_Glyph glyph, double *m, FT_Vector shift) {
1738 int i;
1739 FT_Outline* outline = &((FT_OutlineGlyph)glyph)->outline;
1740 FT_Vector* p = outline->points;
1741
1742 for (i=0; i<outline->n_points; i++) {
1743 p[i].x += shift.x;
1744 p[i].y += shift.y;
1745 transform_vector_3d(p + i, m);
1746 p[i].x -= shift.x;
1747 p[i].y -= shift.y;
1748 }
1749
1750 //transform_vector_3d(&glyph->advance, m);
1751 }
1752
1753 /**
1754 * \brief Apply 3d transformation to several objects
1755 * \param shift FreeType vector
1756 * \param glyph FreeType glyph
1757 * \param glyph2 FreeType glyph
1758 * \param frx x-axis rotation angle
1759 * \param fry y-axis rotation angle
1760 * \param frz z-axis rotation angle
1761 * Rotates both glyphs by frx, fry and frz. Shift vector is added before rotation and subtracted after it.
1762 */
1763 static void transform_3d(FT_Vector shift, FT_Glyph* glyph, FT_Glyph* glyph2, double frx, double fry, double frz)
1764 {
1765 fry = - fry; // FreeType's y axis goes in the opposite direction
1766 if (frx != 0. || fry != 0. || frz != 0.) {
1767 double m[16];
1768 double sx = sin(frx);
1769 double sy = sin(fry);
1770 double sz = sin(frz);
1771 double cx = cos(frx);
1772 double cy = cos(fry);
1773 double cz = cos(frz);
1774 m[0] = cy * cz; m[1] = cy*sz; m[2] = -sy; m[3] = 0.0;
1775 m[4] = -cx*sz + sx*sy*cz; m[5] = cx*cz + sx*sy*sz; m[6] = sx*cy; m[7] = 0.0;
1776 m[8] = sx*sz + cx*sy*cz; m[9] = -sx*cz + cx*sy*sz; m[10] = cx*cy; m[11] = 0.0;
1777 m[12] = 0.0; m[13] = 0.0; m[14] = 0.0; m[15] = 1.0;
1778
1779 if (glyph && *glyph)
1780 transform_glyph_3d(*glyph, m, shift);
1781
1782 if (glyph2 && *glyph2)
1783 transform_glyph_3d(*glyph2, m, shift);
1784 }
1785 }
1786
1787 /**
1788 * \brief Main ass rendering function, glues everything together
1789 * \param event event to render
1790 * Process event, appending resulting ass_image_t's to images_root.
1791 */
1792 static int ass_render_event(ass_event_t* event, event_images_t* event_images)
1793 {
1794 char* p;
1795 FT_UInt previous;
1796 FT_UInt num_glyphs;
1797 FT_Vector pen;
1798 unsigned code;
1799 FT_BBox bbox;
1800 int i, j;
1801 FT_Vector shift;
1802 int MarginL, MarginR, MarginV;
1803 int last_break;
1804 int alignment, halign, valign;
1805 int device_x = 0, device_y = 0;
1806
1807 if (event->Style >= frame_context.track->n_styles) {
1808 mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_NoStyleFound);
1809 return 1;
1810 }
1811 if (!event->Text) {
1812 mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_EmptyEvent);
1813 return 1;
1814 }
1815
1816 init_render_context(event);
1817
1818 text_info.length = 0;
1819 pen.x = 0;
1820 pen.y = 0;
1821 previous = 0;
1822 num_glyphs = 0;
1823 p = event->Text;
1824 // Event parsing.
1825 while (1) {
1826 // get next char, executing style override
1827 // this affects render_context
1828 do {
1829 code = get_next_char(&p);
1830 } while (code && render_context.drawing_mode); // skip everything in drawing mode
1831
1832 // face could have been changed in get_next_char
1833 if (!render_context.font) {
1834 free_render_context();
1835 return 1;
1836 }
1837
1838 if (code == 0)
1839 break;
1840
1841 if (text_info.length >= MAX_GLYPHS) {
1842 mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_MAX_GLYPHS_Reached,
1843 (int)(event - frame_context.track->events), event->Start, event->Duration, event->Text);
1844 break;
1845 }
1846
1847 if ( previous && code ) {
1848 FT_Vector delta;
1849 delta = ass_font_get_kerning(render_context.font, previous, code);
1850 pen.x += delta.x * render_context.scale_x;
1851 pen.y += delta.y * render_context.scale_y;
1852 }
1853
1854 shift.x = pen.x & 63;
1855 shift.y = pen.y & 63;
1856
1857 ass_font_set_transform(render_context.font,
1858 render_context.scale_x * frame_context.font_scale_x,
1859 render_context.scale_y,
1860 &shift );
1861
1862 get_outline_glyph(code, text_info.glyphs + text_info.length, &shift);
1863
1864 text_info.glyphs[text_info.length].pos.x = pen.x >> 6;
1865 text_info.glyphs[text_info.length].pos.y = pen.y >> 6;
1866
1867 pen.x += text_info.glyphs[text_info.length].advance.x;
1868 pen.x += double_to_d6(render_context.hspacing);
1869 pen.y += text_info.glyphs[text_info.length].advance.y;
1870
1871 previous = code;
1872
1873 text_info.glyphs[text_info.length].symbol = code;
1874 text_info.glyphs[text_info.length].linebreak = 0;
1875 for (i = 0; i < 4; ++i) {
1876 uint32_t clr = render_context.c[i];
1877 change_alpha(&clr, mult_alpha(_a(clr), render_context.fade), 1.);
1878 text_info.glyphs[text_info.length].c[i] = clr;
1879 }
1880 text_info.glyphs[text_info.length].effect_type = render_context.effect_type;
1881 text_info.glyphs[text_info.length].effect_timing = render_context.effect_timing;
1882 text_info.glyphs[text_info.length].effect_skip_timing = render_context.effect_skip_timing;
1883 text_info.glyphs[text_info.length].be = render_context.be;
1884 text_info.glyphs[text_info.length].blur = render_context.blur;
1885 text_info.glyphs[text_info.length].shadow = render_context.shadow;
1886 text_info.glyphs[text_info.length].frx = render_context.frx;
1887 text_info.glyphs[text_info.length].fry = render_context.fry;
1888 text_info.glyphs[text_info.length].frz = render_context.frz;
1889 ass_font_get_asc_desc(render_context.font, code,
1890 &text_info.glyphs[text_info.length].asc,
1891 &text_info.glyphs[text_info.length].desc);
1892 text_info.glyphs[text_info.length].asc *= render_context.scale_y;
1893 text_info.glyphs[text_info.length].desc *= render_context.scale_y;
1894
1895 // fill bitmap_hash_key
1896 text_info.glyphs[text_info.length].hash_key.font = render_context.font;
1897 text_info.glyphs[text_info.length].hash_key.size = render_context.font_size;
1898 text_info.glyphs[text_info.length].hash_key.outline = render_context.border * 0xFFFF;
1899 text_info.glyphs[text_info.length].hash_key.scale_x = render_context.scale_x * 0xFFFF;
1900 text_info.glyphs[text_info.length].hash_key.scale_y = render_context.scale_y * 0xFFFF;
1901 text_info.glyphs[text_info.length].hash_key.frx = render_context.frx * 0xFFFF;
1902 text_info.glyphs[text_info.length].hash_key.fry = render_context.fry * 0xFFFF;
1903 text_info.glyphs[text_info.length].hash_key.frz = render_context.frz * 0xFFFF;
1904 text_info.glyphs[text_info.length].hash_key.bold = render_context.bold;
1905 text_info.glyphs[text_info.length].hash_key.italic = render_context.italic;
1906 text_info.glyphs[text_info.length].hash_key.ch = code;
1907 text_info.glyphs[text_info.length].hash_key.advance = shift;
1908 text_info.glyphs[text_info.length].hash_key.be = render_context.be;
1909 text_info.glyphs[text_info.length].hash_key.blur = render_context.blur;
1910
1911 text_info.length++;
1912
1913 render_context.effect_type = EF_NONE;
1914 render_context.effect_timing = 0;
1915 render_context.effect_skip_timing = 0;
1916 }
1917
1918 if (text_info.length == 0) {
1919 // no valid symbols in the event; this can be smth like {comment}
1920 free_render_context();
1921 return 1;
1922 }
1923
1924 // depends on glyph x coordinates being monotonous, so it should be done before line wrap
1925 process_karaoke_effects();
1926
1927 // alignments
1928 alignment = render_context.alignment;
1929 halign = alignment & 3;
1930 valign = alignment & 12;
1931
1932 MarginL = (event->MarginL) ? event->MarginL : render_context.style->MarginL;
1933 MarginR = (event->MarginR) ? event->MarginR : render_context.style->MarginR;
1934 MarginV = (event->MarginV) ? event->MarginV : render_context.style->MarginV;
1935
1936 if (render_context.evt_type != EVENT_HSCROLL) {
1937 int max_text_width;
1938
1939 // calculate max length of a line
1940 max_text_width = x2scr(frame_context.track->PlayResX - MarginR) - x2scr(MarginL);
1941
1942 // rearrange text in several lines
1943 wrap_lines_smart(max_text_width);
1944
1945 // align text
1946 last_break = -1;
1947 for (i = 1; i < text_info.length + 1; ++i) { // (text_info.length + 1) is the end of the last line
1948 if ((i == text_info.length) || text_info.glyphs[i].linebreak) {
1949 int width, shift = 0;
1950 glyph_info_t* first_glyph = text_info.glyphs + last_break + 1;
1951 glyph_info_t* last_glyph = text_info.glyphs + i - 1;
1952
1953 while ((last_glyph > first_glyph) && ((last_glyph->symbol == '\n') || (last_glyph->symbol == 0)))
1954 last_glyph --;
1955
1956 width = last_glyph->pos.x + d6_to_int(last_glyph->advance.x) - first_glyph->pos.x;
1957 if (halign == HALIGN_LEFT) { // left aligned, no action
1958 shift = 0;
1959 } else if (halign == HALIGN_RIGHT) { // right aligned
1960 shift = max_text_width - width;
1961 } else if (halign == HALIGN_CENTER) { // centered
1962 shift = (max_text_width - width) / 2;
1963 }
1964 for (j = last_break + 1; j < i; ++j) {
1965 text_info.glyphs[j].pos.x += shift;
1966 }
1967 last_break = i - 1;
1968 }
1969 }
1970 } else { // render_context.evt_type == EVENT_HSCROLL
1971 measure_text();
1972 }
1973
1974 // determing text bounding box
1975 compute_string_bbox(&text_info, &bbox);
1976
1977 // determine device coordinates for text
1978
1979 // x coordinate for everything except positioned events
1980 if (render_context.evt_type == EVENT_NORMAL ||
1981 render_context.evt_type == EVENT_VSCROLL) {
1982 device_x = x2scr(MarginL);
1983 } else if (render_context.evt_type == EVENT_HSCROLL) {
1984 if (render_context.scroll_direction == SCROLL_RL)
1985 device_x = x2scr(frame_context.track->PlayResX - render_context.scroll_shift);
1986 else if (render_context.scroll_direction == SCROLL_LR)
1987 device_x = x2scr(render_context.scroll_shift) - (bbox.xMax - bbox.xMin);
1988 }
1989
1990 // y coordinate for everything except positioned events
1991 if (render_context.evt_type == EVENT_NORMAL ||
1992 render_context.evt_type == EVENT_HSCROLL) {
1993 if (valign == VALIGN_TOP) { // toptitle
1994 device_y = y2scr_top(MarginV) + d6_to_int(text_info.lines[0].asc);
1995 } else if (valign == VALIGN_CENTER) { // midtitle
1996 int scr_y = y2scr(frame_context.track->PlayResY / 2);
1997 device_y = scr_y - (bbox.yMax - bbox.yMin) / 2;
1998 } else { // subtitle
1999 int scr_y;
2000 if (valign != VALIGN_SUB)
2001 mp_msg(MSGT_ASS, MSGL_V, "Invalid valign, supposing 0 (subtitle)\n");
2002 scr_y = y2scr_sub(frame_context.track->PlayResY - MarginV);
2003 device_y = scr_y;
2004 device_y -= d6_to_int(text_info.height);
2005 device_y += d6_to_int(text_info.lines[0].asc);
2006 }
2007 } else if (render_context.evt_type == EVENT_VSCROLL) {
2008 if (render_context.scroll_direction == SCROLL_TB)
2009 device_y = y2scr(render_context.clip_y0 + render_context.scroll_shift) - (bbox.yMax - bbox.yMin);
2010 else if (render_context.scroll_direction == SCROLL_BT)
2011 device_y = y2scr(render_context.clip_y1 - render_context.scroll_shift);
2012 }
2013
2014 // positioned events are totally different
2015 if (render_context.evt_type == EVENT_POSITIONED) {
2016 int base_x = 0;
2017 int base_y = 0;
2018 mp_msg(MSGT_ASS, MSGL_DBG2, "positioned event at %f, %f\n", render_context.pos_x, render_context.pos_y);
2019 get_base_point(bbox, alignment, &base_x, &base_y);
2020 device_x = x2scr(render_context.pos_x) - base_x;
2021 device_y = y2scr(render_context.pos_y) - base_y;
2022 }
2023
2024 // fix clip coordinates (they depend on alignment)
2025 render_context.clip_x0 = x2scr(render_context.clip_x0);
2026 render_context.clip_x1 = x2scr(render_context.clip_x1);
2027 if (render_context.evt_type == EVENT_NORMAL ||
2028 render_context.evt_type == EVENT_HSCROLL ||
2029 render_context.evt_type == EVENT_VSCROLL) {
2030 if (valign == VALIGN_TOP) {
2031 render_context.clip_y0 = y2scr_top(render_context.clip_y0);
2032 render_context.clip_y1 = y2scr_top(render_context.clip_y1);
2033 } else if (valign == VALIGN_CENTER) {
2034 render_context.clip_y0 = y2scr(render_context.clip_y0);
2035 render_context.clip_y1 = y2scr(render_context.clip_y1);
2036 } else if (valign == VALIGN_SUB) {
2037 render_context.clip_y0 = y2scr_sub(render_context.clip_y0);
2038 render_context.clip_y1 = y2scr_sub(render_context.clip_y1);
2039 }
2040 } else if (render_context.evt_type == EVENT_POSITIONED) {
2041 render_context.clip_y0 = y2scr(render_context.clip_y0);
2042 render_context.clip_y1 = y2scr(render_context.clip_y1);
2043 }
2044
2045 // calculate rotation parameters
2046 {
2047 FT_Vector center;
2048
2049 if (render_context.have_origin) {
2050 center.x = x2scr(render_context.org_x);
2051 center.y = y2scr(render_context.org_y);
2052 } else {
2053 int bx = 0, by = 0;
2054 get_base_point(bbox, alignment, &bx, &by);
2055 center.x = device_x + bx;
2056 center.y = device_y + by;
2057 }
2058
2059 for (i = 0; i < text_info.length; ++i) {
2060 glyph_info_t* info = text_info.glyphs + i;
2061
2062 if (info->hash_key.frx || info->hash_key.fry || info->hash_key.frz) {
2063 info->hash_key.shift_x = info->pos.x + device_x - center.x;
2064 info->hash_key.shift_y = - (info->pos.y + device_y - center.y);
2065 } else {
2066 info->hash_key.shift_x = 0;
2067 info->hash_key.shift_y = 0;
2068 }
2069 }
2070 }
2071
2072 // convert glyphs to bitmaps
2073 for (i = 0; i < text_info.length; ++i)
2074 get_bitmap_glyph(text_info.glyphs + i);
2075
2076 event_images->top = device_y - d6_to_int(text_info.lines[0].asc);
2077 event_images->height = d6_to_int(text_info.height);
2078 event_images->detect_collisions = render_context.detect_collisions;
2079 event_images->shift_direction = (valign == VALIGN_TOP) ? 1 : -1;
2080 event_images->event = event;
2081 event_images->imgs = render_text(&text_info, device_x, device_y);
2082
2083 free_render_context();
2084
2085 return 0;
2086 }
2087
2088 /**
2089 * \brief deallocate image list
2090 * \param img list pointer
2091 */
2092 static void ass_free_images(ass_image_t* img)
2093 {
2094 while (img) {
2095 ass_image_t* next = img->next;
2096 free(img);
2097 img = next;
2098 }
2099 }
2100
2101 static void ass_reconfigure(ass_renderer_t* priv)
2102 {
2103 priv->render_id = ++last_render_id;
2104 ass_glyph_cache_reset();
2105 ass_bitmap_cache_reset();
2106 ass_free_images(priv->prev_images_root);
2107 priv->prev_images_root = 0;
2108 }
2109
2110 void ass_set_frame_size(ass_renderer_t* priv, int w, int h)
2111 {
2112 if (priv->settings.frame_width != w || priv->settings.frame_height != h) {
2113 priv->settings.frame_width = w;
2114 priv->settings.frame_height = h;
2115 if (priv->settings.aspect == 0.)
2116 priv->settings.aspect = ((double)w) / h;
2117 ass_reconfigure(priv);
2118 }
2119 }
2120
2121 void ass_set_margins(ass_renderer_t* priv, int t, int b, int l, int r)
2122 {
2123 if (priv->settings.left_margin != l ||
2124 priv->settings.right_margin != r ||
2125 priv->settings.top_margin != t ||
2126 priv->settings.bottom_margin != b) {
2127 priv->settings.left_margin = l;
2128 priv->settings.right_margin = r;
2129 priv->settings.top_margin = t;
2130 priv->settings.bottom_margin = b;
2131 ass_reconfigure(priv);
2132 }
2133 }
2134
2135 void ass_set_use_margins(ass_renderer_t* priv, int use)
2136 {
2137 priv->settings.use_margins = use;
2138 }
2139
2140 void ass_set_aspect_ratio(ass_renderer_t* priv, double ar)
2141 {
2142 if (priv->settings.aspect != ar) {
2143 priv->settings.aspect = ar;
2144 ass_reconfigure(priv);
2145 }
2146 }
2147
2148 void ass_set_font_scale(ass_renderer_t* priv, double font_scale)
2149 {
2150 if (priv->settings.font_size_coeff != font_scale) {
2151 priv->settings.font_size_coeff = font_scale;
2152 ass_reconfigure(priv);
2153 }
2154 }
2155
2156 void ass_set_hinting(ass_renderer_t* priv, ass_hinting_t ht)
2157 {
2158 if (priv->settings.hinting != ht) {
2159 priv->settings.hinting = ht;
2160 ass_reconfigure(priv);
2161 }
2162 }
2163
2164 void ass_set_line_spacing(ass_renderer_t* priv, double line_spacing)
2165 {
2166 priv->settings.line_spacing = line_spacing;
2167 }
2168
2169 static int ass_set_fonts_(ass_renderer_t* priv, const char* default_font, const char* default_family, int fc)
2170 {
2171 if (priv->settings.default_font)
2172 free(priv->settings.default_font);
2173 if (priv->settings.default_family)
2174 free(priv->settings.default_family);
2175
2176 priv->settings.default_font = default_font ? strdup(default_font) : 0;
2177 priv->settings.default_family = default_family ? strdup(default_family) : 0;
2178
2179 if (priv->fontconfig_priv)
2180 fontconfig_done(priv->fontconfig_priv);
2181 priv->fontconfig_priv = fontconfig_init(priv->library, priv->ftlibrary, default_family, default_font, fc);
2182
2183 return !!priv->fontconfig_priv;
2184 }
2185
2186 int ass_set_fonts(ass_renderer_t* priv, const char* default_font, const char* default_family)
2187 {
2188 return ass_set_fonts_(priv, default_font, default_family, 1);
2189 }
2190
2191 int ass_set_fonts_nofc(ass_renderer_t* priv, const char* default_font, const char* default_family)
2192 {
2193 return ass_set_fonts_(priv, default_font, default_family, 0);
2194 }
2195
2196 /**
2197 * \brief Start a new frame
2198 */
2199 static int ass_start_frame(ass_renderer_t *priv, ass_track_t* track, long long now)
2200 {
2201 ass_renderer = priv;
2202 global_settings = &priv->settings;
2203
2204 if (!priv->settings.frame_width && !priv->settings.frame_height)
2205 return 1; // library not initialized
2206
2207 if (track->n_events == 0)
2208 return 1; // nothing to do
2209
2210 frame_context.ass_priv = priv;
2211 frame_context.width = global_settings->frame_width;
2212 frame_context.height = global_settings->frame_height;
2213 frame_context.orig_width = global_settings->frame_width - global_settings->left_margin - global_settings->right_margin;
2214 frame_context.orig_height = global_settings->frame_height - global_settings->top_margin - global_settings->bottom_margin;
2215 frame_context.orig_width_nocrop = global_settings->frame_width -
2216 FFMAX(global_settings->left_margin, 0) -
2217 FFMAX(global_settings->right_margin, 0);
2218 frame_context.orig_height_nocrop = global_settings->frame_height -
2219 FFMAX(global_settings->top_margin, 0) -
2220 FFMAX(global_settings->bottom_margin, 0);
2221 frame_context.track = track;
2222 frame_context.time = now;
2223
2224 ass_lazy_track_init();
2225
2226 frame_context.font_scale = global_settings->font_size_coeff *
2227 frame_context.orig_height / frame_context.track->PlayResY;
2228 frame_context.border_scale = ((double)frame_context.orig_height) / frame_context.track->PlayResY;
2229
2230 if (frame_context.orig_width * track->PlayResY == frame_context.orig_height * track->PlayResX)
2231 frame_context.font_scale_x = 1.;
2232 else
2233 frame_context.font_scale_x = ((double)(frame_context.orig_width * track->PlayResY)) / (frame_context.orig_height * track->PlayResX);
2234
2235 priv->prev_images_root = priv->images_root;
2236 priv->images_root = 0;
2237
2238 return 0;
2239 }
2240
2241 static int cmp_event_layer(const void* p1, const void* p2)
2242 {
2243 ass_event_t* e1 = ((event_images_t*)p1)->event;
2244 ass_event_t* e2 = ((event_images_t*)p2)->event;
2245 if (e1->Layer < e2->Layer)
2246 return -1;
2247 if (e1->Layer > e2->Layer)
2248 return 1;
2249 if (e1->ReadOrder < e2->ReadOrder)
2250 return -1;
2251 if (e1->ReadOrder > e2->ReadOrder)
2252 return 1;
2253 return 0;
2254 }
2255
2256 #define MAX_EVENTS 100
2257
2258 static render_priv_t* get_render_priv(ass_event_t* event)
2259 {
2260 if (!event->render_priv)
2261 event->render_priv = calloc(1, sizeof(render_priv_t));
2262 // FIXME: check render_id
2263 if (ass_renderer->render_id != event->render_priv->render_id) {
2264 memset(event->render_priv, 0, sizeof(render_priv_t));
2265 event->render_priv->render_id = ass_renderer->render_id;
2266 }
2267 return event->render_priv;
2268 }
2269
2270 typedef struct segment_s {
2271 int a, b; // top and height
2272 } segment_t;
2273
2274 static int overlap(segment_t* s1, segment_t* s2)
2275 {
2276 if (s1->a >= s2->b || s2->a >= s1->b)
2277 return 0;
2278 return 1;
2279 }
2280
2281 static int cmp_segment(const void* p1, const void* p2)
2282 {
2283 return ((segment_t*)p1)->a - ((segment_t*)p2)->a;
2284 }
2285
2286 static void shift_event(event_images_t* ei, int shift)
2287 {
2288 ass_image_t* cur = ei->imgs;
2289 while (cur) {
2290 cur->dst_y += shift;
2291 // clip top and bottom
2292 if (cur->dst_y < 0) {
2293 int clip = - cur->dst_y;
2294 cur->h -= clip;
2295 cur->bitmap += clip * cur->stride;
2296 cur->dst_y = 0;
2297 }
2298 if (cur->dst_y + cur->h >= frame_context.height) {
2299 int clip = cur->dst_y + cur->h - frame_context.height;
2300 cur->h -= clip;
2301 }
2302 if (cur->h <= 0) {
2303 cur->h = 0;
2304 cur->dst_y = 0;
2305 }
2306 cur = cur->next;
2307 }
2308 ei->top += shift;
2309 }
2310
2311 // dir: 1 - move down
2312 // -1 - move up
2313 static int fit_segment(segment_t* s, segment_t* fixed, int* cnt, int dir)
2314 {
2315 int i;
2316 int shift = 0;
2317
2318 if (dir == 1) // move down
2319 for (i = 0; i < *cnt; ++i) {
2320 if (s->b + shift <= fixed[i].a || s->a + shift >= fixed[i].b)
2321 continue;
2322 shift = fixed[i].b - s->a;
2323 }
2324 else // dir == -1, move up
2325 for (i = *cnt-1; i >= 0; --i) {
2326 if (s->b + shift <= fixed[i].a || s->a + shift >= fixed[i].b)
2327 continue;
2328 shift = fixed[i].a - s->b;
2329 }
2330
2331 fixed[*cnt].a = s->a + shift;
2332 fixed[*cnt].b = s->b + shift;
2333 (*cnt)++;
2334 qsort(fixed, *cnt, sizeof(segment_t), cmp_segment);
2335
2336 return shift;
2337 }
2338
2339 static void fix_collisions(event_images_t* imgs, int cnt)
2340 {
2341 segment_t used[MAX_EVENTS];
2342 int cnt_used = 0;
2343 int i, j;
2344
2345 // fill used[] with fixed events
2346 for (i = 0; i < cnt; ++i) {
2347 render_priv_t* priv;
2348 if (!imgs[i].detect_collisions) continue;
2349 priv = get_render_priv(imgs[i].event);
2350 if (priv->height > 0) { // it's a fixed event
2351 segment_t s;
2352 s.a = priv->top;
2353 s.b = priv->top + priv->height;
2354 if (priv->height != imgs[i].height) { // no, it's not
2355 mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_EventHeightHasChanged);
2356 priv->top = 0;
2357 priv->height = 0;
2358 }
2359 for (j = 0; j < cnt_used; ++j)
2360 if (overlap(&s, used + j)) { // no, it's not
2361 priv->top = 0;
2362 priv->height = 0;
2363 }
2364 if (priv->height > 0) { // still a fixed event
2365 used[cnt_used].a = priv->top;
2366 used[cnt_used].b = priv->top + priv->height;
2367 cnt_used ++;
2368 shift_event(imgs + i, priv->top - imgs[i].top);
2369 }
2370 }
2371 }
2372 qsort(used, cnt_used, sizeof(segment_t), cmp_segment);
2373
2374 // try to fit other events in free spaces
2375 for (i = 0; i < cnt; ++i) {
2376 render_priv_t* priv;
2377 if (!imgs[i].detect_collisions) continue;
2378 priv = get_render_priv(imgs[i].event);
2379 if (priv->height == 0) { // not a fixed event
2380 int shift;
2381 segment_t s;
2382 s.a = imgs[i].top;
2383 s.b = imgs[i].top + imgs[i].height;
2384 shift = fit_segment(&s, used, &cnt_used, imgs[i].shift_direction);
2385 if (shift) shift_event(imgs + i, shift);
2386 // make it fixed
2387 priv->top = imgs[i].top;
2388 priv->height = imgs[i].height;
2389 }
2390
2391 }
2392 }
2393
2394 /**
2395 * \brief compare two images
2396 * \param i1 first image
2397 * \param i2 second image
2398 * \return 0 if identical, 1 if different positions, 2 if different content
2399 */
2400 static int ass_image_compare(ass_image_t *i1, ass_image_t *i2)
2401 {
2402 if (i1->w != i2->w) return 2;
2403 if (i1->h != i2->h) return 2;
2404 if (i1->stride != i2->stride) return 2;
2405 if (i1->color != i2->color) return 2;
2406 if (i1->bitmap != i2->bitmap)
2407 return 2;
2408 if (i1->dst_x != i2->dst_x) return 1;
2409 if (i1->dst_y != i2->dst_y) return 1;
2410 return 0;
2411 }
2412
2413 /**
2414 * \brief compare current and previous image list
2415 * \param priv library handle
2416 * \return 0 if identical, 1 if different positions, 2 if different content
2417 */
2418 static int ass_detect_change(ass_renderer_t *priv)
2419 {
2420 ass_image_t* img, *img2;
2421 int diff;
2422
2423 img = priv->prev_images_root;
2424 img2 = priv->images_root;
2425 diff = 0;
2426 while (img && diff < 2) {
2427 ass_image_t* next, *next2;
2428 next = img->next;
2429 if (img2) {
2430 int d = ass_image_compare(img, img2);
2431 if (d > diff) diff = d;
2432 next2 = img2->next;
2433 } else {
2434 // previous list is shorter
2435 diff = 2;
2436 break;
2437 }
2438 img = next;
2439 img2 = next2;
2440 }
2441
2442 // is the previous list longer?
2443 if (img2)
2444 diff = 2;
2445
2446 return diff;
2447 }
2448
2449 /**
2450 * \brief render a frame
2451 * \param priv library handle
2452 * \param track track
2453 * \param now current video timestamp (ms)
2454 * \param detect_change a value describing how the new images differ from the previous ones will be written here:
2455 * 0 if identical, 1 if different positions, 2 if different content.
2456 * Can be NULL, in that case no detection is performed.
2457 */
2458 ass_image_t* ass_render_frame(ass_renderer_t *priv, ass_track_t* track, long long now, int* detect_change)
2459 {
2460 int i, cnt, rc;
2461 event_images_t* last;
2462 ass_image_t** tail;
2463
2464 // init frame
2465 rc = ass_start_frame(priv, track, now);
2466 if (rc != 0)
2467 return 0;
2468
2469 // render events separately
2470 cnt = 0;
2471 for (i = 0; i < track->n_events; ++i) {
2472 ass_event_t* event = track->events + i;
2473 if ( (event->Start <= now) && (now < (event->Start + event->Duration)) ) {
2474 if (cnt >= priv->eimg_size) {
2475 priv->eimg_size += 100;
2476 priv->eimg = realloc(priv->eimg, priv->eimg_size * sizeof(event_images_t));
2477 }
2478 rc = ass_render_event(event, priv->eimg + cnt);
2479 if (!rc) ++cnt;
2480 }
2481 }
2482
2483 // sort by layer
2484 qsort(priv->eimg, cnt, sizeof(event_images_t), cmp_event_layer);
2485
2486 // call fix_collisions for each group of events with the same layer
2487 last = priv->eimg;
2488 for (i = 1; i < cnt; ++i)
2489 if (last->event->Layer != priv->eimg[i].event->Layer) {
2490 fix_collisions(last, priv->eimg + i - last);
2491 last = priv->eimg + i;
2492 }
2493 if (cnt > 0)
2494 fix_collisions(last, priv->eimg + cnt - last);
2495
2496 // concat lists
2497 tail = &ass_renderer->images_root;
2498 for (i = 0; i < cnt; ++i) {
2499 ass_image_t* cur = priv->eimg[i].imgs;
2500 while (cur) {
2501 *tail = cur;
2502 tail = &cur->next;
2503 cur = cur->next;
2504 }
2505 }
2506
2507 if (detect_change)
2508 *detect_change = ass_detect_change(priv);
2509
2510 // free the previous image list
2511 ass_free_images(priv->prev_images_root);
2512 priv->prev_images_root = 0;
2513
2514 return ass_renderer->images_root;
2515 }
2516
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