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Fix braindead and broken way to calculate abase, fixes regression tests on
[mplayer/glamo.git] / libass / ass_render.c
blobead118dddef74abc0cc32048b01dabc63001b146
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 render_context.evt_type = EVENT_POSITIONED;
896 render_context.detect_collisions = 0;
897 render_context.pos_x = v1;
898 render_context.pos_y = v2;
899 }
900 } else if (mystrcmp(&p, "fad")) {
901 int a1, a2, a3;
902 long long t1, t2, t3, t4;
903 if (*p == 'e') ++p; // either \fad or \fade
904 skip('(');
905 mystrtoi(&p, &a1);
906 skip(',');
907 mystrtoi(&p, &a2);
908 if (*p == ')') {
909 // 2-argument version (\fad, according to specs)
910 // a1 and a2 are fade-in and fade-out durations
911 t1 = 0;
912 t4 = render_context.event->Duration;
913 t2 = a1;
914 t3 = t4 - a2;
915 a1 = 0xFF;
916 a2 = 0;
917 a3 = 0xFF;
918 } else {
919 // 6-argument version (\fade)
920 // a1 and a2 (and a3) are opacity values
921 skip(',');
922 mystrtoi(&p, &a3);
923 skip(',');
924 mystrtoll(&p, &t1);
925 skip(',');
926 mystrtoll(&p, &t2);
927 skip(',');
928 mystrtoll(&p, &t3);
929 skip(',');
930 mystrtoll(&p, &t4);
931 }
932 skip(')');
933 render_context.fade = interpolate_alpha(frame_context.time - render_context.event->Start, t1, t2, t3, t4, a1, a2, a3);
934 } else if (mystrcmp(&p, "org")) {
935 int v1, v2;
936 skip('(');
937 mystrtoi(&p, &v1);
938 skip(',');
939 mystrtoi(&p, &v2);
940 skip(')');
941 mp_msg(MSGT_ASS, MSGL_DBG2, "org(%d, %d)\n", v1, v2);
942 // render_context.evt_type = EVENT_POSITIONED;
943 render_context.org_x = v1;
944 render_context.org_y = v2;
945 render_context.have_origin = 1;
946 render_context.detect_collisions = 0;
947 } else if (mystrcmp(&p, "t")) {
948 double v[3];
949 int v1, v2;
950 double v3;
951 int cnt;
952 long long t1, t2, t, delta_t;
953 double k;
954 skip('(');
955 for (cnt = 0; cnt < 3; ++cnt) {
956 if (*p == '\\')
957 break;
958 v[cnt] = strtod(p, &p);
959 skip(',');
960 }
961 if (cnt == 3) {
962 v1 = v[0]; v2 = v[1]; v3 = v[2];
963 } else if (cnt == 2) {
964 v1 = v[0]; v2 = v[1]; v3 = 1.;
965 } else if (cnt == 1) {
966 v1 = 0; v2 = render_context.event->Duration; v3 = v[0];
967 } else { // cnt == 0
968 v1 = 0; v2 = render_context.event->Duration; v3 = 1.;
969 }
970 render_context.detect_collisions = 0;
971 t1 = v1;
972 t2 = v2;
973 delta_t = v2 - v1;
974 if (v3 < 0.)
975 v3 = 0.;
976 t = frame_context.time - render_context.event->Start; // FIXME: move to render_context
977 if (t <= t1)
978 k = 0.;
979 else if (t >= t2)
980 k = 1.;
981 else {
982 assert(delta_t != 0.);
983 k = pow(((double)(t - t1)) / delta_t, v3);
984 }
985 while (*p == '\\')
986 p = parse_tag(p, k); // maybe k*pwr ? no, specs forbid nested \t's
987 skip_to(')'); // in case there is some unknown tag or a comment
988 skip(')');
989 } else if (mystrcmp(&p, "clip")) {
990 int x0, y0, x1, y1;
991 int res = 1;
992 skip('(');
993 res &= mystrtoi(&p, &x0);
994 skip(',');
995 res &= mystrtoi(&p, &y0);
996 skip(',');
997 res &= mystrtoi(&p, &x1);
998 skip(',');
999 res &= mystrtoi(&p, &y1);
1000 skip(')');
1001 if (res) {
1002 render_context.clip_x0 = render_context.clip_x0 * (1-pwr) + x0 * pwr;
1003 render_context.clip_x1 = render_context.clip_x1 * (1-pwr) + x1 * pwr;
1004 render_context.clip_y0 = render_context.clip_y0 * (1-pwr) + y0 * pwr;
1005 render_context.clip_y1 = render_context.clip_y1 * (1-pwr) + y1 * pwr;
1006 } else {
1007 render_context.clip_x0 = 0;
1008 render_context.clip_y0 = 0;
1009 render_context.clip_x1 = frame_context.track->PlayResX;
1010 render_context.clip_y1 = frame_context.track->PlayResY;
1011 }
1012 } else if (mystrcmp(&p, "c")) {
1013 uint32_t val;
1014 if (!strtocolor(&p, &val))
1015 val = render_context.style->PrimaryColour;
1016 mp_msg(MSGT_ASS, MSGL_DBG2, "color: %X\n", val);
1017 change_color(&render_context.c[0], val, pwr);
1018 } else if ((*p >= '1') && (*p <= '4') && (++p) && (mystrcmp(&p, "c") || mystrcmp(&p, "a"))) {
1019 char n = *(p-2);
1020 int cidx = n - '1';
1021 char cmd = *(p-1);
1022 uint32_t val;
1023 assert((n >= '1') && (n <= '4'));
1024 if (!strtocolor(&p, &val))
1025 switch(n) {
1026 case '1': val = render_context.style->PrimaryColour; break;
1027 case '2': val = render_context.style->SecondaryColour; break;
1028 case '3': val = render_context.style->OutlineColour; break;
1029 case '4': val = render_context.style->BackColour; break;
1030 default : val = 0; break; // impossible due to assert; avoid compilation warning
1031 }
1032 switch (cmd) {
1033 case 'c': change_color(render_context.c + cidx, val, pwr); break;
1034 case 'a': change_alpha(render_context.c + cidx, val >> 24, pwr); break;
1035 default: mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_BadCommand, n, cmd); break;
1036 }
1037 mp_msg(MSGT_ASS, MSGL_DBG2, "single c/a at %f: %c%c = %X \n", pwr, n, cmd, render_context.c[cidx]);
1038 } else if (mystrcmp(&p, "r")) {
1039 reset_render_context();
1040 } else if (mystrcmp(&p, "be")) {
1041 int val;
1042 if (mystrtoi(&p, &val)) {
1043 // Clamp to 10, since high values need excessive CPU
1044 val = (val < 0) ? 0 : val;
1045 val = (val > 10) ? 10 : val;
1046 render_context.be = val;
1047 } else
1048 render_context.be = 0;
1049 } else if (mystrcmp(&p, "b")) {
1050 int b;
1051 if (mystrtoi(&p, &b)) {
1052 if (pwr >= .5)
1053 render_context.bold = b;
1054 } else
1055 render_context.bold = render_context.style->Bold;
1056 update_font();
1057 } else if (mystrcmp(&p, "i")) {
1058 int i;
1059 if (mystrtoi(&p, &i)) {
1060 if (pwr >= .5)
1061 render_context.italic = i;
1062 } else
1063 render_context.italic = render_context.style->Italic;
1064 update_font();
1065 } else if (mystrcmp(&p, "kf") || mystrcmp(&p, "K")) {
1066 int val = 0;
1067 mystrtoi(&p, &val);
1068 render_context.effect_type = EF_KARAOKE_KF;
1069 if (render_context.effect_timing)
1070 render_context.effect_skip_timing += render_context.effect_timing;
1071 render_context.effect_timing = val * 10;
1072 } else if (mystrcmp(&p, "ko")) {
1073 int val = 0;
1074 mystrtoi(&p, &val);
1075 render_context.effect_type = EF_KARAOKE_KO;
1076 if (render_context.effect_timing)
1077 render_context.effect_skip_timing += render_context.effect_timing;
1078 render_context.effect_timing = val * 10;
1079 } else if (mystrcmp(&p, "k")) {
1080 int val = 0;
1081 mystrtoi(&p, &val);
1082 render_context.effect_type = EF_KARAOKE;
1083 if (render_context.effect_timing)
1084 render_context.effect_skip_timing += render_context.effect_timing;
1085 render_context.effect_timing = val * 10;
1086 } else if (mystrcmp(&p, "shad")) {
1087 int val;
1088 if (mystrtoi(&p, &val))
1089 render_context.shadow = val;
1090 else
1091 render_context.shadow = render_context.style->Shadow;
1092 } else if (mystrcmp(&p, "pbo")) {
1093 int val = 0;
1094 mystrtoi(&p, &val); // ignored
1095 } else if (mystrcmp(&p, "p")) {
1096 int val;
1097 if (!mystrtoi(&p, &val))
1098 val = 0;
1099 render_context.drawing_mode = !!val;
1100 }
1101
1102 return p;
1103
1104 #undef skip
1105 #undef skip_to
1106 }
1107
1108 /**
1109 * \brief Get next ucs4 char from string, parsing and executing style overrides
1110 * \param str string pointer
1111 * \return ucs4 code of the next char
1112 * On return str points to the unparsed part of the string
1113 */
1114 static unsigned get_next_char(char** str)
1115 {
1116 char* p = *str;
1117 unsigned chr;
1118 if (*p == '{') { // '\0' goes here
1119 p++;
1120 while (1) {
1121 p = parse_tag(p, 1.);
1122 if (*p == '}') { // end of tag
1123 p++;
1124 if (*p == '{') {
1125 p++;
1126 continue;
1127 } else
1128 break;
1129 } else if (*p != '\\')
1130 mp_msg(MSGT_ASS, MSGL_V, "Unable to parse: \"%s\" \n", p);
1131 if (*p == 0)
1132 break;
1133 }
1134 }
1135 if (*p == '\t') {
1136 ++p;
1137 *str = p;
1138 return ' ';
1139 }
1140 if (*p == '\\') {
1141 if ((*(p+1) == 'N') || ((*(p+1) == 'n') && (frame_context.track->WrapStyle == 2))) {
1142 p += 2;
1143 *str = p;
1144 return '\n';
1145 } else if ((*(p+1) == 'n') || (*(p+1) == 'h')) {
1146 p += 2;
1147 *str = p;
1148 return ' ';
1149 }
1150 }
1151 chr = utf8_get_char((const char **)&p);
1152 *str = p;
1153 return chr;
1154 }
1155
1156 static void apply_transition_effects(ass_event_t* event)
1157 {
1158 int v[4];
1159 int cnt;
1160 char* p = event->Effect;
1161
1162 if (!p || !*p) return;
1163
1164 cnt = 0;
1165 while (cnt < 4 && (p = strchr(p, ';'))) {
1166 v[cnt++] = atoi(++p);
1167 }
1168
1169 if (strncmp(event->Effect, "Banner;", 7) == 0) {
1170 int delay;
1171 if (cnt < 1) {
1172 mp_msg(MSGT_ASS, MSGL_V, "Error parsing effect: %s \n", event->Effect);
1173 return;
1174 }
1175 if (cnt >= 2 && v[1] == 0) // right-to-left
1176 render_context.scroll_direction = SCROLL_RL;
1177 else // left-to-right
1178 render_context.scroll_direction = SCROLL_LR;
1179
1180 delay = v[0];
1181 if (delay == 0) delay = 1; // ?
1182 render_context.scroll_shift = (frame_context.time - render_context.event->Start) / delay;
1183 render_context.evt_type = EVENT_HSCROLL;
1184 return;
1185 }
1186
1187 if (strncmp(event->Effect, "Scroll up;", 10) == 0) {
1188 render_context.scroll_direction = SCROLL_BT;
1189 } else if (strncmp(event->Effect, "Scroll down;", 12) == 0) {
1190 render_context.scroll_direction = SCROLL_TB;
1191 } else {
1192 mp_msg(MSGT_ASS, MSGL_V, "Unknown transition effect: %s \n", event->Effect);
1193 return;
1194 }
1195 // parse scroll up/down parameters
1196 {
1197 int delay;
1198 int y0, y1;
1199 if (cnt < 3) {
1200 mp_msg(MSGT_ASS, MSGL_V, "Error parsing effect: %s \n", event->Effect);
1201 return;
1202 }
1203 delay = v[2];
1204 if (delay == 0) delay = 1; // ?
1205 render_context.scroll_shift = (frame_context.time - render_context.event->Start) / delay;
1206 if (v[0] < v[1]) {
1207 y0 = v[0]; y1 = v[1];
1208 } else {
1209 y0 = v[1]; y1 = v[0];
1210 }
1211 if (y1 == 0)
1212 y1 = frame_context.track->PlayResY; // y0=y1=0 means fullscreen scrolling
1213 render_context.clip_y0 = y0;
1214 render_context.clip_y1 = y1;
1215 render_context.evt_type = EVENT_VSCROLL;
1216 render_context.detect_collisions = 0;
1217 }
1218
1219 }
1220
1221 /**
1222 * \brief partially reset render_context to style values
1223 * Works like {\r}: resets some style overrides
1224 */
1225 static void reset_render_context(void)
1226 {
1227 render_context.c[0] = render_context.style->PrimaryColour;
1228 render_context.c[1] = render_context.style->SecondaryColour;
1229 render_context.c[2] = render_context.style->OutlineColour;
1230 render_context.c[3] = render_context.style->BackColour;
1231 render_context.font_size = render_context.style->FontSize;
1232
1233 if (render_context.family)
1234 free(render_context.family);
1235 render_context.family = strdup(render_context.style->FontName);
1236 render_context.bold = render_context.style->Bold;
1237 render_context.italic = render_context.style->Italic;
1238 update_font();
1239
1240 change_border(-1.);
1241 render_context.scale_x = render_context.style->ScaleX;
1242 render_context.scale_y = render_context.style->ScaleY;
1243 render_context.hspacing = render_context.style->Spacing;
1244 render_context.be = 0;
1245 render_context.blur = 0.0;
1246 render_context.shadow = render_context.style->Shadow;
1247 render_context.frx = render_context.fry = 0.;
1248 render_context.frz = M_PI * render_context.style->Angle / 180.;
1249
1250 // FIXME: does not reset unsupported attributes.
1251 }
1252
1253 /**
1254 * \brief Start new event. Reset render_context.
1255 */
1256 static void init_render_context(ass_event_t* event)
1257 {
1258 render_context.event = event;
1259 render_context.style = frame_context.track->styles + event->Style;
1260
1261 reset_render_context();
1262
1263 render_context.evt_type = EVENT_NORMAL;
1264 render_context.alignment = render_context.style->Alignment;
1265 render_context.pos_x = 0;
1266 render_context.pos_y = 0;
1267 render_context.org_x = 0;
1268 render_context.org_y = 0;
1269 render_context.have_origin = 0;
1270 render_context.clip_x0 = 0;
1271 render_context.clip_y0 = 0;
1272 render_context.clip_x1 = frame_context.track->PlayResX;
1273 render_context.clip_y1 = frame_context.track->PlayResY;
1274 render_context.detect_collisions = 1;
1275 render_context.fade = 0;
1276 render_context.drawing_mode = 0;
1277 render_context.effect_type = EF_NONE;
1278 render_context.effect_timing = 0;
1279 render_context.effect_skip_timing = 0;
1280
1281 apply_transition_effects(event);
1282 }
1283
1284 static void free_render_context(void)
1285 {
1286 }
1287
1288 /**
1289 * \brief Get normal and outline (border) glyphs
1290 * \param symbol ucs4 char
1291 * \param info out: struct filled with extracted data
1292 * \param advance subpixel shift vector used for cache lookup
1293 * Tries to get both glyphs from cache.
1294 * If they can't be found, gets a glyph from font face, generates outline with FT_Stroker,
1295 * and add them to cache.
1296 * The glyphs are returned in info->glyph and info->outline_glyph
1297 */
1298 static void get_outline_glyph(int symbol, glyph_info_t* info, FT_Vector* advance)
1299 {
1300 int error;
1301 glyph_hash_val_t* val;
1302 glyph_hash_key_t key;
1303 key.font = render_context.font;
1304 key.size = render_context.font_size;
1305 key.ch = symbol;
1306 key.scale_x = (render_context.scale_x * 0xFFFF);
1307 key.scale_y = (render_context.scale_y * 0xFFFF);
1308 key.advance = *advance;
1309 key.bold = render_context.bold;
1310 key.italic = render_context.italic;
1311 key.outline = render_context.border * 0xFFFF;
1312
1313 memset(info, 0, sizeof(glyph_info_t));
1314
1315 val = cache_find_glyph(&key);
1316 if (val) {
1317 FT_Glyph_Copy(val->glyph, &info->glyph);
1318 if (val->outline_glyph)
1319 FT_Glyph_Copy(val->outline_glyph, &info->outline_glyph);
1320 info->bbox = val->bbox_scaled;
1321 info->advance.x = val->advance.x;
1322 info->advance.y = val->advance.y;
1323 } else {
1324 glyph_hash_val_t v;
1325 info->glyph = ass_font_get_glyph(frame_context.ass_priv->fontconfig_priv, render_context.font, symbol, global_settings->hinting);
1326 if (!info->glyph)
1327 return;
1328 info->advance.x = d16_to_d6(info->glyph->advance.x);
1329 info->advance.y = d16_to_d6(info->glyph->advance.y);
1330 FT_Glyph_Get_CBox( info->glyph, FT_GLYPH_BBOX_PIXELS, &info->bbox);
1331
1332 if (render_context.stroker) {
1333 info->outline_glyph = info->glyph;
1334 error = FT_Glyph_StrokeBorder( &(info->outline_glyph), render_context.stroker, 0 , 0 ); // don't destroy original
1335 if (error) {
1336 mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_FT_Glyph_Stroke_Error, error);
1337 }
1338 }
1339
1340 memset(&v, 0, sizeof(v));
1341 FT_Glyph_Copy(info->glyph, &v.glyph);
1342 if (info->outline_glyph)
1343 FT_Glyph_Copy(info->outline_glyph, &v.outline_glyph);
1344 v.advance = info->advance;
1345 v.bbox_scaled = info->bbox;
1346 cache_add_glyph(&key, &v);
1347 }
1348 }
1349
1350 static void transform_3d(FT_Vector shift, FT_Glyph* glyph, FT_Glyph* glyph2, double frx, double fry, double frz);
1351
1352 /**
1353 * \brief Get bitmaps for a glyph
1354 * \param info glyph info
1355 * Tries to get glyph bitmaps from bitmap cache.
1356 * If they can't be found, they are generated by rotating and rendering the glyph.
1357 * After that, bitmaps are added to the cache.
1358 * They are returned in info->bm (glyph), info->bm_o (outline) and info->bm_s (shadow).
1359 */
1360 static void get_bitmap_glyph(glyph_info_t* info)
1361 {
1362 bitmap_hash_val_t* val;
1363 bitmap_hash_key_t* key = &info->hash_key;
1364
1365 val = cache_find_bitmap(key);
1366 /* val = 0; */
1367
1368 if (val) {
1369 info->bm = val->bm;
1370 info->bm_o = val->bm_o;
1371 info->bm_s = val->bm_s;
1372 } else {
1373 FT_Vector shift;
1374 bitmap_hash_val_t hash_val;
1375 int error;
1376 info->bm = info->bm_o = info->bm_s = 0;
1377 if (info->glyph && info->symbol != '\n' && info->symbol != 0) {
1378 // calculating rotation shift vector (from rotation origin to the glyph basepoint)
1379 shift.x = int_to_d6(info->hash_key.shift_x);
1380 shift.y = int_to_d6(info->hash_key.shift_y);
1381 // apply rotation
1382 transform_3d(shift, &info->glyph, &info->outline_glyph, info->frx, info->fry, info->frz);
1383
1384 // render glyph
1385 error = glyph_to_bitmap(ass_renderer->synth_priv,
1386 ass_renderer->synth_priv_blur,
1387 info->glyph, info->outline_glyph,
1388 &info->bm, &info->bm_o,
1389 &info->bm_s, info->be, info->blur);
1390 if (error)
1391 info->symbol = 0;
1392
1393 // add bitmaps to cache
1394 hash_val.bm_o = info->bm_o;
1395 hash_val.bm = info->bm;
1396 hash_val.bm_s = info->bm_s;
1397 cache_add_bitmap(&(info->hash_key), &hash_val);
1398 }
1399 }
1400 // deallocate glyphs
1401 if (info->glyph)
1402 FT_Done_Glyph(info->glyph);
1403 if (info->outline_glyph)
1404 FT_Done_Glyph(info->outline_glyph);
1405 }
1406
1407 /**
1408 * This function goes through text_info and calculates text parameters.
1409 * The following text_info fields are filled:
1410 * height
1411 * lines[].height
1412 * lines[].asc
1413 * lines[].desc
1414 */
1415 static void measure_text(void)
1416 {
1417 int cur_line = 0, max_asc = 0, max_desc = 0;
1418 int i;
1419 text_info.height = 0;
1420 for (i = 0; i < text_info.length + 1; ++i) {
1421 if ((i == text_info.length) || text_info.glyphs[i].linebreak) {
1422 text_info.lines[cur_line].asc = max_asc;
1423 text_info.lines[cur_line].desc = max_desc;
1424 text_info.height += max_asc + max_desc;
1425 cur_line ++;
1426 max_asc = max_desc = 0;
1427 }
1428 if (i < text_info.length) {
1429 glyph_info_t* cur = text_info.glyphs + i;
1430 if (cur->asc > max_asc)
1431 max_asc = cur->asc;
1432 if (cur->desc > max_desc)
1433 max_desc = cur->desc;
1434 }
1435 }
1436 text_info.height += (text_info.n_lines - 1) * double_to_d6(global_settings->line_spacing);
1437 }
1438
1439 /**
1440 * \brief rearrange text between lines
1441 * \param max_text_width maximal text line width in pixels
1442 * The algo is similar to the one in libvo/sub.c:
1443 * 1. Place text, wrapping it when current line is full
1444 * 2. Try moving words from the end of a line to the beginning of the next one while it reduces
1445 * the difference in lengths between this two lines.
1446 * The result may not be optimal, but usually is good enough.
1447 */
1448 static void wrap_lines_smart(int max_text_width)
1449 {
1450 int i, j;
1451 glyph_info_t *cur, *s1, *e1, *s2, *s3, *w;
1452 int last_space;
1453 int break_type;
1454 int exit;
1455 int pen_shift_x;
1456 int pen_shift_y;
1457 int cur_line;
1458
1459 last_space = -1;
1460 text_info.n_lines = 1;
1461 break_type = 0;
1462 s1 = text_info.glyphs; // current line start
1463 for (i = 0; i < text_info.length; ++i) {
1464 int break_at, s_offset, len;
1465 cur = text_info.glyphs + i;
1466 break_at = -1;
1467 s_offset = s1->bbox.xMin + s1->pos.x;
1468 len = (cur->bbox.xMax + cur->pos.x) - s_offset;
1469
1470 if (cur->symbol == '\n') {
1471 break_type = 2;
1472 break_at = i;
1473 mp_msg(MSGT_ASS, MSGL_DBG2, "forced line break at %d\n", break_at);
1474 }
1475
1476 if (len >= max_text_width) {
1477 break_type = 1;
1478 break_at = last_space;
1479 if (break_at == -1)
1480 break_at = i - 1;
1481 if (break_at == -1)
1482 break_at = 0;
1483 mp_msg(MSGT_ASS, MSGL_DBG2, "overfill at %d\n", i);
1484 mp_msg(MSGT_ASS, MSGL_DBG2, "line break at %d\n", break_at);
1485 }
1486
1487 if (break_at != -1) {
1488 // need to use one more line
1489 // marking break_at+1 as start of a new line
1490 int lead = break_at + 1; // the first symbol of the new line
1491 if (text_info.n_lines >= MAX_LINES) {
1492 // to many lines !
1493 // no more linebreaks
1494 for (j = lead; j < text_info.length; ++j)
1495 text_info.glyphs[j].linebreak = 0;
1496 break;
1497 }
1498 if (lead < text_info.length)
1499 text_info.glyphs[lead].linebreak = break_type;
1500 last_space = -1;
1501 s1 = text_info.glyphs + lead;
1502 s_offset = s1->bbox.xMin + s1->pos.x;
1503 text_info.n_lines ++;
1504 }
1505
1506 if (cur->symbol == ' ')
1507 last_space = i;
1508
1509 // make sure the hard linebreak is not forgotten when
1510 // there was a new soft linebreak just inserted
1511 if (cur->symbol == '\n' && break_type == 1)
1512 i--;
1513 }
1514 #define DIFF(x,y) (((x) < (y)) ? (y - x) : (x - y))
1515 exit = 0;
1516 while (!exit) {
1517 exit = 1;
1518 w = s3 = text_info.glyphs;
1519 s1 = s2 = 0;
1520 for (i = 0; i <= text_info.length; ++i) {
1521 cur = text_info.glyphs + i;
1522 if ((i == text_info.length) || cur->linebreak) {
1523 s1 = s2;
1524 s2 = s3;
1525 s3 = cur;
1526 if (s1 && (s2->linebreak == 1)) { // have at least 2 lines, and linebreak is 'soft'
1527 int l1, l2, l1_new, l2_new;
1528
1529 w = s2;
1530 do { --w; } while ((w > s1) && (w->symbol == ' '));
1531 while ((w > s1) && (w->symbol != ' ')) { --w; }
1532 e1 = w;
1533 while ((e1 > s1) && (e1->symbol == ' ')) { --e1; }
1534 if (w->symbol == ' ') ++w;
1535
1536 l1 = ((s2-1)->bbox.xMax + (s2-1)->pos.x) - (s1->bbox.xMin + s1->pos.x);
1537 l2 = ((s3-1)->bbox.xMax + (s3-1)->pos.x) - (s2->bbox.xMin + s2->pos.x);
1538 l1_new = (e1->bbox.xMax + e1->pos.x) - (s1->bbox.xMin + s1->pos.x);
1539 l2_new = ((s3-1)->bbox.xMax + (s3-1)->pos.x) - (w->bbox.xMin + w->pos.x);
1540
1541 if (DIFF(l1_new, l2_new) < DIFF(l1, l2)) {
1542 w->linebreak = 1;
1543 s2->linebreak = 0;
1544 exit = 0;
1545 }
1546 }
1547 }
1548 if (i == text_info.length)
1549 break;
1550 }
1551
1552 }
1553 assert(text_info.n_lines >= 1);
1554 #undef DIFF
1555
1556 measure_text();
1557
1558 pen_shift_x = 0;
1559 pen_shift_y = 0;
1560 cur_line = 1;
1561 for (i = 0; i < text_info.length; ++i) {
1562 cur = text_info.glyphs + i;
1563 if (cur->linebreak) {
1564 int height = text_info.lines[cur_line - 1].desc + text_info.lines[cur_line].asc;
1565 cur_line ++;
1566 pen_shift_x = - cur->pos.x;
1567 pen_shift_y += d6_to_int(height + double_to_d6(global_settings->line_spacing));
1568 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);
1569 }
1570 cur->pos.x += pen_shift_x;
1571 cur->pos.y += pen_shift_y;
1572 }
1573 }
1574
1575 /**
1576 * \brief determine karaoke effects
1577 * Karaoke effects cannot be calculated during parse stage (get_next_char()),
1578 * so they are done in a separate step.
1579 * Parse stage: when karaoke style override is found, its parameters are stored in the next glyph's
1580 * (the first glyph of the karaoke word)'s effect_type and effect_timing.
1581 * This function:
1582 * 1. sets effect_type for all glyphs in the word (_karaoke_ word)
1583 * 2. sets effect_timing for all glyphs to x coordinate of the border line between the left and right karaoke parts
1584 * (left part is filled with PrimaryColour, right one - with SecondaryColour).
1585 */
1586 static void process_karaoke_effects(void)
1587 {
1588 glyph_info_t *cur, *cur2;
1589 glyph_info_t *s1, *e1; // start and end of the current word
1590 glyph_info_t *s2; // start of the next word
1591 int i;
1592 int timing; // current timing
1593 int tm_start, tm_end; // timings at start and end of the current word
1594 int tm_current;
1595 double dt;
1596 int x;
1597 int x_start, x_end;
1598
1599 tm_current = frame_context.time - render_context.event->Start;
1600 timing = 0;
1601 s1 = s2 = 0;
1602 for (i = 0; i <= text_info.length; ++i) {
1603 cur = text_info.glyphs + i;
1604 if ((i == text_info.length) || (cur->effect_type != EF_NONE)) {
1605 s1 = s2;
1606 s2 = cur;
1607 if (s1) {
1608 e1 = s2 - 1;
1609 tm_start = timing + s1->effect_skip_timing;
1610 tm_end = tm_start + s1->effect_timing;
1611 timing = tm_end;
1612 x_start = 1000000;
1613 x_end = -1000000;
1614 for (cur2 = s1; cur2 <= e1; ++cur2) {
1615 x_start = FFMIN(x_start, cur2->bbox.xMin + cur2->pos.x);
1616 x_end = FFMAX(x_end, cur2->bbox.xMax + cur2->pos.x);
1617 }
1618
1619 dt = (tm_current - tm_start);
1620 if ((s1->effect_type == EF_KARAOKE) || (s1->effect_type == EF_KARAOKE_KO)) {
1621 if (dt > 0)
1622 x = x_end + 1;
1623 else
1624 x = x_start;
1625 } else if (s1->effect_type == EF_KARAOKE_KF) {
1626 dt /= (tm_end - tm_start);
1627 x = x_start + (x_end - x_start) * dt;
1628 } else {
1629 mp_msg(MSGT_ASS, MSGL_ERR, MSGTR_LIBASS_UnknownEffectType_InternalError);
1630 continue;
1631 }
1632
1633 for (cur2 = s1; cur2 <= e1; ++cur2) {
1634 cur2->effect_type = s1->effect_type;
1635 cur2->effect_timing = x - cur2->pos.x;
1636 }
1637 }
1638 }
1639 }
1640 }
1641
1642 /**
1643 * \brief Calculate base point for positioning and rotation
1644 * \param bbox text bbox
1645 * \param alignment alignment
1646 * \param bx, by out: base point coordinates
1647 */
1648 static void get_base_point(FT_BBox bbox, int alignment, int* bx, int* by)
1649 {
1650 const int halign = alignment & 3;
1651 const int valign = alignment & 12;
1652 if (bx)
1653 switch(halign) {
1654 case HALIGN_LEFT:
1655 *bx = bbox.xMin;
1656 break;
1657 case HALIGN_CENTER:
1658 *bx = (bbox.xMax + bbox.xMin) / 2;
1659 break;
1660 case HALIGN_RIGHT:
1661 *bx = bbox.xMax;
1662 break;
1663 }
1664 if (by)
1665 switch(valign) {
1666 case VALIGN_TOP:
1667 *by = bbox.yMin;
1668 break;
1669 case VALIGN_CENTER:
1670 *by = (bbox.yMax + bbox.yMin) / 2;
1671 break;
1672 case VALIGN_SUB:
1673 *by = bbox.yMax;
1674 break;
1675 }
1676 }
1677
1678 /**
1679 * \brief Multiply 4-vector by 4-matrix
1680 * \param a 4-vector
1681 * \param m 4-matrix]
1682 * \param b out: 4-vector
1683 * Calculates a * m and stores result in b
1684 */
1685 static inline void transform_point_3d(double *a, double *m, double *b)
1686 {
1687 b[0] = a[0] * m[0] + a[1] * m[4] + a[2] * m[8] + a[3] * m[12];
1688 b[1] = a[0] * m[1] + a[1] * m[5] + a[2] * m[9] + a[3] * m[13];
1689 b[2] = a[0] * m[2] + a[1] * m[6] + a[2] * m[10] + a[3] * m[14];
1690 b[3] = a[0] * m[3] + a[1] * m[7] + a[2] * m[11] + a[3] * m[15];
1691 }
1692
1693 /**
1694 * \brief Apply 3d transformation to a vector
1695 * \param v FreeType vector (2d)
1696 * \param m 4-matrix
1697 * Transforms v by m, projects the result back to the screen plane
1698 * Result is returned in v.
1699 */
1700 static inline void transform_vector_3d(FT_Vector* v, double *m) {
1701 const double camera = 2500 * frame_context.border_scale; // camera distance
1702 const double cutoff_z = 10.;
1703 double a[4], b[4];
1704 a[0] = d6_to_double(v->x);
1705 a[1] = d6_to_double(v->y);
1706 a[2] = 0.;
1707 a[3] = 1.;
1708 transform_point_3d(a, m, b);
1709 /* Apply perspective projection with the following matrix:
1710 2500 0 0 0
1711 0 2500 0 0
1712 0 0 0 0
1713 0 0 8 2500
1714 where 2500 is camera distance, 8 - z-axis scale.
1715 Camera is always located in (org_x, org_y, -2500). This means
1716 that different subtitle events can be displayed at the same time
1717 using different cameras. */
1718 b[0] *= camera;
1719 b[1] *= camera;
1720 b[3] = 8 * b[2] + camera;
1721 if (b[3] < cutoff_z)
1722 b[3] = cutoff_z;
1723 v->x = double_to_d6(b[0] / b[3]);
1724 v->y = double_to_d6(b[1] / b[3]);
1725 }
1726
1727 /**
1728 * \brief Apply 3d transformation to a glyph
1729 * \param glyph FreeType glyph
1730 * \param m 4-matrix
1731 * Transforms glyph by m, projects the result back to the screen plane
1732 * Result is returned in glyph.
1733 */
1734 static inline void transform_glyph_3d(FT_Glyph glyph, double *m, FT_Vector shift) {
1735 int i;
1736 FT_Outline* outline = &((FT_OutlineGlyph)glyph)->outline;
1737 FT_Vector* p = outline->points;
1738
1739 for (i=0; i<outline->n_points; i++) {
1740 p[i].x += shift.x;
1741 p[i].y += shift.y;
1742 transform_vector_3d(p + i, m);
1743 p[i].x -= shift.x;
1744 p[i].y -= shift.y;
1745 }
1746
1747 //transform_vector_3d(&glyph->advance, m);
1748 }
1749
1750 /**
1751 * \brief Apply 3d transformation to several objects
1752 * \param shift FreeType vector
1753 * \param glyph FreeType glyph
1754 * \param glyph2 FreeType glyph
1755 * \param frx x-axis rotation angle
1756 * \param fry y-axis rotation angle
1757 * \param frz z-axis rotation angle
1758 * Rotates both glyphs by frx, fry and frz. Shift vector is added before rotation and subtracted after it.
1759 */
1760 static void transform_3d(FT_Vector shift, FT_Glyph* glyph, FT_Glyph* glyph2, double frx, double fry, double frz)
1761 {
1762 fry = - fry; // FreeType's y axis goes in the opposite direction
1763 if (frx != 0. || fry != 0. || frz != 0.) {
1764 double m[16];
1765 double sx = sin(frx);
1766 double sy = sin(fry);
1767 double sz = sin(frz);
1768 double cx = cos(frx);
1769 double cy = cos(fry);
1770 double cz = cos(frz);
1771 m[0] = cy * cz; m[1] = cy*sz; m[2] = -sy; m[3] = 0.0;
1772 m[4] = -cx*sz + sx*sy*cz; m[5] = cx*cz + sx*sy*sz; m[6] = sx*cy; m[7] = 0.0;
1773 m[8] = sx*sz + cx*sy*cz; m[9] = -sx*cz + cx*sy*sz; m[10] = cx*cy; m[11] = 0.0;
1774 m[12] = 0.0; m[13] = 0.0; m[14] = 0.0; m[15] = 1.0;
1775
1776 if (glyph && *glyph)
1777 transform_glyph_3d(*glyph, m, shift);
1778
1779 if (glyph2 && *glyph2)
1780 transform_glyph_3d(*glyph2, m, shift);
1781 }
1782 }
1783
1784 /**
1785 * \brief Main ass rendering function, glues everything together
1786 * \param event event to render
1787 * Process event, appending resulting ass_image_t's to images_root.
1788 */
1789 static int ass_render_event(ass_event_t* event, event_images_t* event_images)
1790 {
1791 char* p;
1792 FT_UInt previous;
1793 FT_UInt num_glyphs;
1794 FT_Vector pen;
1795 unsigned code;
1796 FT_BBox bbox;
1797 int i, j;
1798 FT_Vector shift;
1799 int MarginL, MarginR, MarginV;
1800 int last_break;
1801 int alignment, halign, valign;
1802 int device_x = 0, device_y = 0;
1803
1804 if (event->Style >= frame_context.track->n_styles) {
1805 mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_NoStyleFound);
1806 return 1;
1807 }
1808 if (!event->Text) {
1809 mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_EmptyEvent);
1810 return 1;
1811 }
1812
1813 init_render_context(event);
1814
1815 text_info.length = 0;
1816 pen.x = 0;
1817 pen.y = 0;
1818 previous = 0;
1819 num_glyphs = 0;
1820 p = event->Text;
1821 // Event parsing.
1822 while (1) {
1823 // get next char, executing style override
1824 // this affects render_context
1825 do {
1826 code = get_next_char(&p);
1827 } while (code && render_context.drawing_mode); // skip everything in drawing mode
1828
1829 // face could have been changed in get_next_char
1830 if (!render_context.font) {
1831 free_render_context();
1832 return 1;
1833 }
1834
1835 if (code == 0)
1836 break;
1837
1838 if (text_info.length >= MAX_GLYPHS) {
1839 mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_MAX_GLYPHS_Reached,
1840 (int)(event - frame_context.track->events), event->Start, event->Duration, event->Text);
1841 break;
1842 }
1843
1844 if ( previous && code ) {
1845 FT_Vector delta;
1846 delta = ass_font_get_kerning(render_context.font, previous, code);
1847 pen.x += delta.x * render_context.scale_x;
1848 pen.y += delta.y * render_context.scale_y;
1849 }
1850
1851 shift.x = pen.x & 63;
1852 shift.y = pen.y & 63;
1853
1854 ass_font_set_transform(render_context.font,
1855 render_context.scale_x * frame_context.font_scale_x,
1856 render_context.scale_y,
1857 &shift );
1858
1859 get_outline_glyph(code, text_info.glyphs + text_info.length, &shift);
1860
1861 text_info.glyphs[text_info.length].pos.x = pen.x >> 6;
1862 text_info.glyphs[text_info.length].pos.y = pen.y >> 6;
1863
1864 pen.x += text_info.glyphs[text_info.length].advance.x;
1865 pen.x += double_to_d6(render_context.hspacing);
1866 pen.y += text_info.glyphs[text_info.length].advance.y;
1867
1868 previous = code;
1869
1870 text_info.glyphs[text_info.length].symbol = code;
1871 text_info.glyphs[text_info.length].linebreak = 0;
1872 for (i = 0; i < 4; ++i) {
1873 uint32_t clr = render_context.c[i];
1874 change_alpha(&clr, mult_alpha(_a(clr), render_context.fade), 1.);
1875 text_info.glyphs[text_info.length].c[i] = clr;
1876 }
1877 text_info.glyphs[text_info.length].effect_type = render_context.effect_type;
1878 text_info.glyphs[text_info.length].effect_timing = render_context.effect_timing;
1879 text_info.glyphs[text_info.length].effect_skip_timing = render_context.effect_skip_timing;
1880 text_info.glyphs[text_info.length].be = render_context.be;
1881 text_info.glyphs[text_info.length].blur = render_context.blur;
1882 text_info.glyphs[text_info.length].shadow = render_context.shadow;
1883 text_info.glyphs[text_info.length].frx = render_context.frx;
1884 text_info.glyphs[text_info.length].fry = render_context.fry;
1885 text_info.glyphs[text_info.length].frz = render_context.frz;
1886 ass_font_get_asc_desc(render_context.font, code,
1887 &text_info.glyphs[text_info.length].asc,
1888 &text_info.glyphs[text_info.length].desc);
1889 text_info.glyphs[text_info.length].asc *= render_context.scale_y;
1890 text_info.glyphs[text_info.length].desc *= render_context.scale_y;
1891
1892 // fill bitmap_hash_key
1893 text_info.glyphs[text_info.length].hash_key.font = render_context.font;
1894 text_info.glyphs[text_info.length].hash_key.size = render_context.font_size;
1895 text_info.glyphs[text_info.length].hash_key.outline = render_context.border * 0xFFFF;
1896 text_info.glyphs[text_info.length].hash_key.scale_x = render_context.scale_x * 0xFFFF;
1897 text_info.glyphs[text_info.length].hash_key.scale_y = render_context.scale_y * 0xFFFF;
1898 text_info.glyphs[text_info.length].hash_key.frx = render_context.frx * 0xFFFF;
1899 text_info.glyphs[text_info.length].hash_key.fry = render_context.fry * 0xFFFF;
1900 text_info.glyphs[text_info.length].hash_key.frz = render_context.frz * 0xFFFF;
1901 text_info.glyphs[text_info.length].hash_key.bold = render_context.bold;
1902 text_info.glyphs[text_info.length].hash_key.italic = render_context.italic;
1903 text_info.glyphs[text_info.length].hash_key.ch = code;
1904 text_info.glyphs[text_info.length].hash_key.advance = shift;
1905 text_info.glyphs[text_info.length].hash_key.be = render_context.be;
1906 text_info.glyphs[text_info.length].hash_key.blur = render_context.blur;
1907
1908 text_info.length++;
1909
1910 render_context.effect_type = EF_NONE;
1911 render_context.effect_timing = 0;
1912 render_context.effect_skip_timing = 0;
1913 }
1914
1915 if (text_info.length == 0) {
1916 // no valid symbols in the event; this can be smth like {comment}
1917 free_render_context();
1918 return 1;
1919 }
1920
1921 // depends on glyph x coordinates being monotonous, so it should be done before line wrap
1922 process_karaoke_effects();
1923
1924 // alignments
1925 alignment = render_context.alignment;
1926 halign = alignment & 3;
1927 valign = alignment & 12;
1928
1929 MarginL = (event->MarginL) ? event->MarginL : render_context.style->MarginL;
1930 MarginR = (event->MarginR) ? event->MarginR : render_context.style->MarginR;
1931 MarginV = (event->MarginV) ? event->MarginV : render_context.style->MarginV;
1932
1933 if (render_context.evt_type != EVENT_HSCROLL) {
1934 int max_text_width;
1935
1936 // calculate max length of a line
1937 max_text_width = x2scr(frame_context.track->PlayResX - MarginR) - x2scr(MarginL);
1938
1939 // rearrange text in several lines
1940 wrap_lines_smart(max_text_width);
1941
1942 // align text
1943 last_break = -1;
1944 for (i = 1; i < text_info.length + 1; ++i) { // (text_info.length + 1) is the end of the last line
1945 if ((i == text_info.length) || text_info.glyphs[i].linebreak) {
1946 int width, shift = 0;
1947 glyph_info_t* first_glyph = text_info.glyphs + last_break + 1;
1948 glyph_info_t* last_glyph = text_info.glyphs + i - 1;
1949
1950 while ((last_glyph > first_glyph) && ((last_glyph->symbol == '\n') || (last_glyph->symbol == 0)))
1951 last_glyph --;
1952
1953 width = last_glyph->pos.x + d6_to_int(last_glyph->advance.x) - first_glyph->pos.x;
1954 if (halign == HALIGN_LEFT) { // left aligned, no action
1955 shift = 0;
1956 } else if (halign == HALIGN_RIGHT) { // right aligned
1957 shift = max_text_width - width;
1958 } else if (halign == HALIGN_CENTER) { // centered
1959 shift = (max_text_width - width) / 2;
1960 }
1961 for (j = last_break + 1; j < i; ++j) {
1962 text_info.glyphs[j].pos.x += shift;
1963 }
1964 last_break = i - 1;
1965 }
1966 }
1967 } else { // render_context.evt_type == EVENT_HSCROLL
1968 measure_text();
1969 }
1970
1971 // determing text bounding box
1972 compute_string_bbox(&text_info, &bbox);
1973
1974 // determine device coordinates for text
1975
1976 // x coordinate for everything except positioned events
1977 if (render_context.evt_type == EVENT_NORMAL ||
1978 render_context.evt_type == EVENT_VSCROLL) {
1979 device_x = x2scr(MarginL);
1980 } else if (render_context.evt_type == EVENT_HSCROLL) {
1981 if (render_context.scroll_direction == SCROLL_RL)
1982 device_x = x2scr(frame_context.track->PlayResX - render_context.scroll_shift);
1983 else if (render_context.scroll_direction == SCROLL_LR)
1984 device_x = x2scr(render_context.scroll_shift) - (bbox.xMax - bbox.xMin);
1985 }
1986
1987 // y coordinate for everything except positioned events
1988 if (render_context.evt_type == EVENT_NORMAL ||
1989 render_context.evt_type == EVENT_HSCROLL) {
1990 if (valign == VALIGN_TOP) { // toptitle
1991 device_y = y2scr_top(MarginV) + d6_to_int(text_info.lines[0].asc);
1992 } else if (valign == VALIGN_CENTER) { // midtitle
1993 int scr_y = y2scr(frame_context.track->PlayResY / 2);
1994 device_y = scr_y - (bbox.yMax - bbox.yMin) / 2;
1995 } else { // subtitle
1996 int scr_y;
1997 if (valign != VALIGN_SUB)
1998 mp_msg(MSGT_ASS, MSGL_V, "Invalid valign, supposing 0 (subtitle)\n");
1999 scr_y = y2scr_sub(frame_context.track->PlayResY - MarginV);
2000 device_y = scr_y;
2001 device_y -= d6_to_int(text_info.height);
2002 device_y += d6_to_int(text_info.lines[0].asc);
2003 }
2004 } else if (render_context.evt_type == EVENT_VSCROLL) {
2005 if (render_context.scroll_direction == SCROLL_TB)
2006 device_y = y2scr(render_context.clip_y0 + render_context.scroll_shift) - (bbox.yMax - bbox.yMin);
2007 else if (render_context.scroll_direction == SCROLL_BT)
2008 device_y = y2scr(render_context.clip_y1 - render_context.scroll_shift);
2009 }
2010
2011 // positioned events are totally different
2012 if (render_context.evt_type == EVENT_POSITIONED) {
2013 int base_x = 0;
2014 int base_y = 0;
2015 mp_msg(MSGT_ASS, MSGL_DBG2, "positioned event at %f, %f\n", render_context.pos_x, render_context.pos_y);
2016 get_base_point(bbox, alignment, &base_x, &base_y);
2017 device_x = x2scr(render_context.pos_x) - base_x;
2018 device_y = y2scr(render_context.pos_y) - base_y;
2019 }
2020
2021 // fix clip coordinates (they depend on alignment)
2022 render_context.clip_x0 = x2scr(render_context.clip_x0);
2023 render_context.clip_x1 = x2scr(render_context.clip_x1);
2024 if (render_context.evt_type == EVENT_NORMAL ||
2025 render_context.evt_type == EVENT_HSCROLL ||
2026 render_context.evt_type == EVENT_VSCROLL) {
2027 if (valign == VALIGN_TOP) {
2028 render_context.clip_y0 = y2scr_top(render_context.clip_y0);
2029 render_context.clip_y1 = y2scr_top(render_context.clip_y1);
2030 } else if (valign == VALIGN_CENTER) {
2031 render_context.clip_y0 = y2scr(render_context.clip_y0);
2032 render_context.clip_y1 = y2scr(render_context.clip_y1);
2033 } else if (valign == VALIGN_SUB) {
2034 render_context.clip_y0 = y2scr_sub(render_context.clip_y0);
2035 render_context.clip_y1 = y2scr_sub(render_context.clip_y1);
2036 }
2037 } else if (render_context.evt_type == EVENT_POSITIONED) {
2038 render_context.clip_y0 = y2scr(render_context.clip_y0);
2039 render_context.clip_y1 = y2scr(render_context.clip_y1);
2040 }
2041
2042 // calculate rotation parameters
2043 {
2044 FT_Vector center;
2045
2046 if (render_context.have_origin) {
2047 center.x = x2scr(render_context.org_x);
2048 center.y = y2scr(render_context.org_y);
2049 } else {
2050 int bx = 0, by = 0;
2051 get_base_point(bbox, alignment, &bx, &by);
2052 center.x = device_x + bx;
2053 center.y = device_y + by;
2054 }
2055
2056 for (i = 0; i < text_info.length; ++i) {
2057 glyph_info_t* info = text_info.glyphs + i;
2058
2059 if (info->hash_key.frx || info->hash_key.fry || info->hash_key.frz) {
2060 info->hash_key.shift_x = info->pos.x + device_x - center.x;
2061 info->hash_key.shift_y = - (info->pos.y + device_y - center.y);
2062 } else {
2063 info->hash_key.shift_x = 0;
2064 info->hash_key.shift_y = 0;
2065 }
2066 }
2067 }
2068
2069 // convert glyphs to bitmaps
2070 for (i = 0; i < text_info.length; ++i)
2071 get_bitmap_glyph(text_info.glyphs + i);
2072
2073 event_images->top = device_y - d6_to_int(text_info.lines[0].asc);
2074 event_images->height = d6_to_int(text_info.height);
2075 event_images->detect_collisions = render_context.detect_collisions;
2076 event_images->shift_direction = (valign == VALIGN_TOP) ? 1 : -1;
2077 event_images->event = event;
2078 event_images->imgs = render_text(&text_info, device_x, device_y);
2079
2080 free_render_context();
2081
2082 return 0;
2083 }
2084
2085 /**
2086 * \brief deallocate image list
2087 * \param img list pointer
2088 */
2089 void ass_free_images(ass_image_t* img)
2090 {
2091 while (img) {
2092 ass_image_t* next = img->next;
2093 free(img);
2094 img = next;
2095 }
2096 }
2097
2098 static void ass_reconfigure(ass_renderer_t* priv)
2099 {
2100 priv->render_id = ++last_render_id;
2101 ass_glyph_cache_reset();
2102 ass_bitmap_cache_reset();
2103 ass_free_images(priv->prev_images_root);
2104 priv->prev_images_root = 0;
2105 }
2106
2107 void ass_set_frame_size(ass_renderer_t* priv, int w, int h)
2108 {
2109 if (priv->settings.frame_width != w || priv->settings.frame_height != h) {
2110 priv->settings.frame_width = w;
2111 priv->settings.frame_height = h;
2112 if (priv->settings.aspect == 0.)
2113 priv->settings.aspect = ((double)w) / h;
2114 ass_reconfigure(priv);
2115 }
2116 }
2117
2118 void ass_set_margins(ass_renderer_t* priv, int t, int b, int l, int r)
2119 {
2120 if (priv->settings.left_margin != l ||
2121 priv->settings.right_margin != r ||
2122 priv->settings.top_margin != t ||
2123 priv->settings.bottom_margin != b) {
2124 priv->settings.left_margin = l;
2125 priv->settings.right_margin = r;
2126 priv->settings.top_margin = t;
2127 priv->settings.bottom_margin = b;
2128 ass_reconfigure(priv);
2129 }
2130 }
2131
2132 void ass_set_use_margins(ass_renderer_t* priv, int use)
2133 {
2134 priv->settings.use_margins = use;
2135 }
2136
2137 void ass_set_aspect_ratio(ass_renderer_t* priv, double ar)
2138 {
2139 if (priv->settings.aspect != ar) {
2140 priv->settings.aspect = ar;
2141 ass_reconfigure(priv);
2142 }
2143 }
2144
2145 void ass_set_font_scale(ass_renderer_t* priv, double font_scale)
2146 {
2147 if (priv->settings.font_size_coeff != font_scale) {
2148 priv->settings.font_size_coeff = font_scale;
2149 ass_reconfigure(priv);
2150 }
2151 }
2152
2153 void ass_set_hinting(ass_renderer_t* priv, ass_hinting_t ht)
2154 {
2155 if (priv->settings.hinting != ht) {
2156 priv->settings.hinting = ht;
2157 ass_reconfigure(priv);
2158 }
2159 }
2160
2161 void ass_set_line_spacing(ass_renderer_t* priv, double line_spacing)
2162 {
2163 priv->settings.line_spacing = line_spacing;
2164 }
2165
2166 static int ass_set_fonts_(ass_renderer_t* priv, const char* default_font, const char* default_family, int fc)
2167 {
2168 if (priv->settings.default_font)
2169 free(priv->settings.default_font);
2170 if (priv->settings.default_family)
2171 free(priv->settings.default_family);
2172
2173 priv->settings.default_font = default_font ? strdup(default_font) : 0;
2174 priv->settings.default_family = default_family ? strdup(default_family) : 0;
2175
2176 if (priv->fontconfig_priv)
2177 fontconfig_done(priv->fontconfig_priv);
2178 priv->fontconfig_priv = fontconfig_init(priv->library, priv->ftlibrary, default_family, default_font, fc);
2179
2180 return !!priv->fontconfig_priv;
2181 }
2182
2183 int ass_set_fonts(ass_renderer_t* priv, const char* default_font, const char* default_family)
2184 {
2185 return ass_set_fonts_(priv, default_font, default_family, 1);
2186 }
2187
2188 int ass_set_fonts_nofc(ass_renderer_t* priv, const char* default_font, const char* default_family)
2189 {
2190 return ass_set_fonts_(priv, default_font, default_family, 0);
2191 }
2192
2193 /**
2194 * \brief Start a new frame
2195 */
2196 static int ass_start_frame(ass_renderer_t *priv, ass_track_t* track, long long now)
2197 {
2198 ass_renderer = priv;
2199 global_settings = &priv->settings;
2200
2201 if (!priv->settings.frame_width && !priv->settings.frame_height)
2202 return 1; // library not initialized
2203
2204 if (track->n_events == 0)
2205 return 1; // nothing to do
2206
2207 frame_context.ass_priv = priv;
2208 frame_context.width = global_settings->frame_width;
2209 frame_context.height = global_settings->frame_height;
2210 frame_context.orig_width = global_settings->frame_width - global_settings->left_margin - global_settings->right_margin;
2211 frame_context.orig_height = global_settings->frame_height - global_settings->top_margin - global_settings->bottom_margin;
2212 frame_context.orig_width_nocrop = global_settings->frame_width -
2213 FFMAX(global_settings->left_margin, 0) -
2214 FFMAX(global_settings->right_margin, 0);
2215 frame_context.orig_height_nocrop = global_settings->frame_height -
2216 FFMAX(global_settings->top_margin, 0) -
2217 FFMAX(global_settings->bottom_margin, 0);
2218 frame_context.track = track;
2219 frame_context.time = now;
2220
2221 ass_lazy_track_init();
2222
2223 frame_context.font_scale = global_settings->font_size_coeff *
2224 frame_context.orig_height / frame_context.track->PlayResY;
2225 frame_context.border_scale = ((double)frame_context.orig_height) / frame_context.track->PlayResY;
2226
2227 if (frame_context.orig_width * track->PlayResY == frame_context.orig_height * track->PlayResX)
2228 frame_context.font_scale_x = 1.;
2229 else
2230 frame_context.font_scale_x = ((double)(frame_context.orig_width * track->PlayResY)) / (frame_context.orig_height * track->PlayResX);
2231
2232 priv->prev_images_root = priv->images_root;
2233 priv->images_root = 0;
2234
2235 return 0;
2236 }
2237
2238 static int cmp_event_layer(const void* p1, const void* p2)
2239 {
2240 ass_event_t* e1 = ((event_images_t*)p1)->event;
2241 ass_event_t* e2 = ((event_images_t*)p2)->event;
2242 if (e1->Layer < e2->Layer)
2243 return -1;
2244 if (e1->Layer > e2->Layer)
2245 return 1;
2246 if (e1->ReadOrder < e2->ReadOrder)
2247 return -1;
2248 if (e1->ReadOrder > e2->ReadOrder)
2249 return 1;
2250 return 0;
2251 }
2252
2253 #define MAX_EVENTS 100
2254
2255 static render_priv_t* get_render_priv(ass_event_t* event)
2256 {
2257 if (!event->render_priv)
2258 event->render_priv = calloc(1, sizeof(render_priv_t));
2259 // FIXME: check render_id
2260 if (ass_renderer->render_id != event->render_priv->render_id) {
2261 memset(event->render_priv, 0, sizeof(render_priv_t));
2262 event->render_priv->render_id = ass_renderer->render_id;
2263 }
2264 return event->render_priv;
2265 }
2266
2267 typedef struct segment_s {
2268 int a, b; // top and height
2269 } segment_t;
2270
2271 static int overlap(segment_t* s1, segment_t* s2)
2272 {
2273 if (s1->a >= s2->b || s2->a >= s1->b)
2274 return 0;
2275 return 1;
2276 }
2277
2278 static int cmp_segment(const void* p1, const void* p2)
2279 {
2280 return ((segment_t*)p1)->a - ((segment_t*)p2)->a;
2281 }
2282
2283 static void shift_event(event_images_t* ei, int shift)
2284 {
2285 ass_image_t* cur = ei->imgs;
2286 while (cur) {
2287 cur->dst_y += shift;
2288 // clip top and bottom
2289 if (cur->dst_y < 0) {
2290 int clip = - cur->dst_y;
2291 cur->h -= clip;
2292 cur->bitmap += clip * cur->stride;
2293 cur->dst_y = 0;
2294 }
2295 if (cur->dst_y + cur->h >= frame_context.height) {
2296 int clip = cur->dst_y + cur->h - frame_context.height;
2297 cur->h -= clip;
2298 }
2299 if (cur->h <= 0) {
2300 cur->h = 0;
2301 cur->dst_y = 0;
2302 }
2303 cur = cur->next;
2304 }
2305 ei->top += shift;
2306 }
2307
2308 // dir: 1 - move down
2309 // -1 - move up
2310 static int fit_segment(segment_t* s, segment_t* fixed, int* cnt, int dir)
2311 {
2312 int i;
2313 int shift = 0;
2314
2315 if (dir == 1) // move down
2316 for (i = 0; i < *cnt; ++i) {
2317 if (s->b + shift <= fixed[i].a || s->a + shift >= fixed[i].b)
2318 continue;
2319 shift = fixed[i].b - s->a;
2320 }
2321 else // dir == -1, move up
2322 for (i = *cnt-1; i >= 0; --i) {
2323 if (s->b + shift <= fixed[i].a || s->a + shift >= fixed[i].b)
2324 continue;
2325 shift = fixed[i].a - s->b;
2326 }
2327
2328 fixed[*cnt].a = s->a + shift;
2329 fixed[*cnt].b = s->b + shift;
2330 (*cnt)++;
2331 qsort(fixed, *cnt, sizeof(segment_t), cmp_segment);
2332
2333 return shift;
2334 }
2335
2336 static void fix_collisions(event_images_t* imgs, int cnt)
2337 {
2338 segment_t used[MAX_EVENTS];
2339 int cnt_used = 0;
2340 int i, j;
2341
2342 // fill used[] with fixed events
2343 for (i = 0; i < cnt; ++i) {
2344 render_priv_t* priv;
2345 if (!imgs[i].detect_collisions) continue;
2346 priv = get_render_priv(imgs[i].event);
2347 if (priv->height > 0) { // it's a fixed event
2348 segment_t s;
2349 s.a = priv->top;
2350 s.b = priv->top + priv->height;
2351 if (priv->height != imgs[i].height) { // no, it's not
2352 mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_EventHeightHasChanged);
2353 priv->top = 0;
2354 priv->height = 0;
2355 }
2356 for (j = 0; j < cnt_used; ++j)
2357 if (overlap(&s, used + j)) { // no, it's not
2358 priv->top = 0;
2359 priv->height = 0;
2360 }
2361 if (priv->height > 0) { // still a fixed event
2362 used[cnt_used].a = priv->top;
2363 used[cnt_used].b = priv->top + priv->height;
2364 cnt_used ++;
2365 shift_event(imgs + i, priv->top - imgs[i].top);
2366 }
2367 }
2368 }
2369 qsort(used, cnt_used, sizeof(segment_t), cmp_segment);
2370
2371 // try to fit other events in free spaces
2372 for (i = 0; i < cnt; ++i) {
2373 render_priv_t* priv;
2374 if (!imgs[i].detect_collisions) continue;
2375 priv = get_render_priv(imgs[i].event);
2376 if (priv->height == 0) { // not a fixed event
2377 int shift;
2378 segment_t s;
2379 s.a = imgs[i].top;
2380 s.b = imgs[i].top + imgs[i].height;
2381 shift = fit_segment(&s, used, &cnt_used, imgs[i].shift_direction);
2382 if (shift) shift_event(imgs + i, shift);
2383 // make it fixed
2384 priv->top = imgs[i].top;
2385 priv->height = imgs[i].height;
2386 }
2387
2388 }
2389 }
2390
2391 /**
2392 * \brief compare two images
2393 * \param i1 first image
2394 * \param i2 second image
2395 * \return 0 if identical, 1 if different positions, 2 if different content
2396 */
2397 int ass_image_compare(ass_image_t *i1, ass_image_t *i2)
2398 {
2399 if (i1->w != i2->w) return 2;
2400 if (i1->h != i2->h) return 2;
2401 if (i1->stride != i2->stride) return 2;
2402 if (i1->color != i2->color) return 2;
2403 if (i1->bitmap != i2->bitmap)
2404 return 2;
2405 if (i1->dst_x != i2->dst_x) return 1;
2406 if (i1->dst_y != i2->dst_y) return 1;
2407 return 0;
2408 }
2409
2410 /**
2411 * \brief compare current and previous image list
2412 * \param priv library handle
2413 * \return 0 if identical, 1 if different positions, 2 if different content
2414 */
2415 int ass_detect_change(ass_renderer_t *priv)
2416 {
2417 ass_image_t* img, *img2;
2418 int diff;
2419
2420 img = priv->prev_images_root;
2421 img2 = priv->images_root;
2422 diff = 0;
2423 while (img && diff < 2) {
2424 ass_image_t* next, *next2;
2425 next = img->next;
2426 if (img2) {
2427 int d = ass_image_compare(img, img2);
2428 if (d > diff) diff = d;
2429 next2 = img2->next;
2430 } else {
2431 // previous list is shorter
2432 diff = 2;
2433 break;
2434 }
2435 img = next;
2436 img2 = next2;
2437 }
2438
2439 // is the previous list longer?
2440 if (img2)
2441 diff = 2;
2442
2443 return diff;
2444 }
2445
2446 /**
2447 * \brief render a frame
2448 * \param priv library handle
2449 * \param track track
2450 * \param now current video timestamp (ms)
2451 * \param detect_change a value describing how the new images differ from the previous ones will be written here:
2452 * 0 if identical, 1 if different positions, 2 if different content.
2453 * Can be NULL, in that case no detection is performed.
2454 */
2455 ass_image_t* ass_render_frame(ass_renderer_t *priv, ass_track_t* track, long long now, int* detect_change)
2456 {
2457 int i, cnt, rc;
2458 event_images_t* last;
2459 ass_image_t** tail;
2460
2461 // init frame
2462 rc = ass_start_frame(priv, track, now);
2463 if (rc != 0)
2464 return 0;
2465
2466 // render events separately
2467 cnt = 0;
2468 for (i = 0; i < track->n_events; ++i) {
2469 ass_event_t* event = track->events + i;
2470 if ( (event->Start <= now) && (now < (event->Start + event->Duration)) ) {
2471 if (cnt >= priv->eimg_size) {
2472 priv->eimg_size += 100;
2473 priv->eimg = realloc(priv->eimg, priv->eimg_size * sizeof(event_images_t));
2474 }
2475 rc = ass_render_event(event, priv->eimg + cnt);
2476 if (!rc) ++cnt;
2477 }
2478 }
2479
2480 // sort by layer
2481 qsort(priv->eimg, cnt, sizeof(event_images_t), cmp_event_layer);
2482
2483 // call fix_collisions for each group of events with the same layer
2484 last = priv->eimg;
2485 for (i = 1; i < cnt; ++i)
2486 if (last->event->Layer != priv->eimg[i].event->Layer) {
2487 fix_collisions(last, priv->eimg + i - last);
2488 last = priv->eimg + i;
2489 }
2490 if (cnt > 0)
2491 fix_collisions(last, priv->eimg + cnt - last);
2492
2493 // concat lists
2494 tail = &ass_renderer->images_root;
2495 for (i = 0; i < cnt; ++i) {
2496 ass_image_t* cur = priv->eimg[i].imgs;
2497 while (cur) {
2498 *tail = cur;
2499 tail = &cur->next;
2500 cur = cur->next;
2501 }
2502 }
2503
2504 if (detect_change)
2505 *detect_change = ass_detect_change(priv);
2506
2507 // free the previous image list
2508 ass_free_images(priv->prev_images_root);
2509 priv->prev_images_root = 0;
2510
2511 return ass_renderer->images_root;
2512 }
2513
mplayer with SMedia Glamo drivers