1 // -*- c-basic-offset: 8; indent-tabs-mode: t -*-
2 // vim:ts=8:sw=8:noet:ai:
4 * Copyright (C) 2006 Evgeniy Stepanov <eugeni.stepanov@gmail.com>
6 * This file is part of libass.
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.
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.
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.
29 #include FT_FREETYPE_H
32 #include FT_SYNTHESIS_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"
44 #define MAX_GLYPHS 3000
46 #define BLUR_MAX_RADIUS 50.0
48 #define ROUND(x) ((int) ((x) + .5))
49 #define SUBPIXEL_MASK 56 // d6 bitmask for subpixel accuracy adjustment
51 static int last_render_id
= 0;
53 typedef struct ass_settings_s
{
56 double font_size_coeff
; // font size multiplier
57 double line_spacing
; // additional line spacing (in frame pixels)
58 int top_margin
; // height of top margin. Everything except toptitles is shifted down by top_margin.
59 int bottom_margin
; // height of bottom margin. (frame_height - top_margin - bottom_margin) is original video height.
62 int use_margins
; // 0 - place all subtitles inside original frame
63 // 1 - use margins for placing toptitles and subtitles
64 double aspect
; // frame aspect ratio, d_width / d_height.
65 ass_hinting_t hinting
;
72 typedef struct event_images_s
{
75 int detect_collisions
;
80 struct ass_renderer_s
{
81 ass_library_t
* library
;
83 fc_instance_t
* fontconfig_priv
;
84 ass_settings_t settings
;
86 ass_synth_priv_t
* synth_priv
;
88 ass_image_t
* images_root
; // rendering result is stored here
89 ass_image_t
* prev_images_root
;
91 event_images_t
* eimg
; // temporary buffer for sorting rendered events
92 int eimg_size
; // allocated buffer size
95 typedef enum {EF_NONE
= 0, EF_KARAOKE
, EF_KARAOKE_KF
, EF_KARAOKE_KO
} effect_t
;
98 // glyph_info_t and text_info_t are used for text centering and word-wrapping operations
99 typedef struct glyph_info_s
{
102 FT_Glyph outline_glyph
;
103 bitmap_t
* bm
; // glyph bitmap
104 bitmap_t
* bm_o
; // outline bitmap
105 bitmap_t
* bm_s
; // shadow bitmap
108 char linebreak
; // the first (leading) glyph of some line ?
109 uint32_t c
[4]; // colors
110 FT_Vector advance
; // 26.6
111 effect_t effect_type
;
112 int effect_timing
; // time duration of current karaoke word
113 // after process_karaoke_effects: distance in pixels from the glyph origin.
114 // part of the glyph to the left of it is displayed in a different color.
115 int effect_skip_timing
; // delay after the end of last karaoke word
116 int asc
, desc
; // font max ascender and descender
118 int be
; // blur edges
119 double blur
; // gaussian blur
121 double frx
, fry
, frz
; // rotation
123 bitmap_hash_key_t hash_key
;
126 typedef struct line_info_s
{
130 typedef struct text_info_s
{
131 glyph_info_t
* glyphs
;
133 line_info_t lines
[MAX_LINES
];
140 // Values like current font face, color, screen position, clipping and so on are stored here.
141 typedef struct render_context_s
{
150 int alignment
; // alignment overrides go here; if zero, style value will be used
151 double frx
, fry
, frz
;
152 enum { EVENT_NORMAL
, // "normal" top-, sub- or mid- title
153 EVENT_POSITIONED
, // happens after pos(,), margins are ignored
154 EVENT_HSCROLL
, // "Banner" transition effect, text_width is unlimited
155 EVENT_VSCROLL
// "Scroll up", "Scroll down" transition effects
157 double pos_x
, pos_y
; // position
158 double org_x
, org_y
; // origin
159 char have_origin
; // origin is explicitly defined; if 0, get_base_point() is used
160 double scale_x
, scale_y
;
161 double hspacing
; // distance between letters, in pixels
162 double border
; // outline width
163 uint32_t c
[4]; // colors(Primary, Secondary, so on) in RGBA
164 int clip_x0
, clip_y0
, clip_x1
, clip_y1
;
165 char detect_collisions
;
166 uint32_t fade
; // alpha from \fad
167 char be
; // blur edges
168 double blur
; // gaussian blur
170 int drawing_mode
; // not implemented; when != 0 text is discarded, except for style override tags
172 effect_t effect_type
;
174 int effect_skip_timing
;
176 enum { SCROLL_LR
, // left-to-right
178 SCROLL_TB
, // top-to-bottom
180 } scroll_direction
; // for EVENT_HSCROLL, EVENT_VSCROLL
187 int treat_family_as_pattern
;
192 typedef struct frame_context_s
{
193 ass_renderer_t
* ass_priv
;
194 int width
, height
; // screen dimensions
195 int orig_height
; // frame height ( = screen height - margins )
196 int orig_width
; // frame width ( = screen width - margins )
197 int orig_height_nocrop
; // frame height ( = screen height - margins + cropheight)
198 int orig_width_nocrop
; // frame width ( = screen width - margins + cropwidth)
200 long long time
; // frame's timestamp, ms
202 double font_scale_x
; // x scale applied to all glyphs to preserve text aspect ratio
206 static ass_renderer_t
* ass_renderer
;
207 static ass_settings_t
* global_settings
;
208 static text_info_t text_info
;
209 static render_context_t render_context
;
210 static frame_context_t frame_context
;
212 struct render_priv_s
{
217 static void ass_lazy_track_init(void)
219 ass_track_t
* track
= frame_context
.track
;
220 if (track
->PlayResX
&& track
->PlayResY
)
222 if (!track
->PlayResX
&& !track
->PlayResY
) {
223 mp_msg(MSGT_ASS
, MSGL_WARN
, MSGTR_LIBASS_NeitherPlayResXNorPlayResYDefined
);
224 track
->PlayResX
= 384;
225 track
->PlayResY
= 288;
227 double orig_aspect
= (global_settings
->aspect
* frame_context
.height
* frame_context
.orig_width
) /
228 frame_context
.orig_height
/ frame_context
.width
;
229 if (!track
->PlayResY
&& track
->PlayResX
== 1280) {
230 track
->PlayResY
= 1024;
231 mp_msg(MSGT_ASS
, MSGL_WARN
, MSGTR_LIBASS_PlayResYUndefinedSettingY
, track
->PlayResY
);
232 } else if (!track
->PlayResY
) {
233 track
->PlayResY
= track
->PlayResX
/ orig_aspect
+ .5;
234 mp_msg(MSGT_ASS
, MSGL_WARN
, MSGTR_LIBASS_PlayResYUndefinedSettingY
, track
->PlayResY
);
235 } else if (!track
->PlayResX
&& track
->PlayResY
== 1024) {
236 track
->PlayResX
= 1280;
237 mp_msg(MSGT_ASS
, MSGL_WARN
, MSGTR_LIBASS_PlayResXUndefinedSettingX
, track
->PlayResX
);
238 } else if (!track
->PlayResX
) {
239 track
->PlayResX
= track
->PlayResY
* orig_aspect
+ .5;
240 mp_msg(MSGT_ASS
, MSGL_WARN
, MSGTR_LIBASS_PlayResXUndefinedSettingX
, track
->PlayResX
);
245 ass_renderer_t
* ass_renderer_init(ass_library_t
* library
)
249 ass_renderer_t
* priv
= 0;
250 int vmajor
, vminor
, vpatch
;
252 memset(&render_context
, 0, sizeof(render_context
));
253 memset(&frame_context
, 0, sizeof(frame_context
));
254 memset(&text_info
, 0, sizeof(text_info
));
256 error
= FT_Init_FreeType( &ft
);
258 mp_msg(MSGT_ASS
, MSGL_FATAL
, MSGTR_LIBASS_FT_Init_FreeTypeFailed
);
262 FT_Library_Version(ft
, &vmajor
, &vminor
, &vpatch
);
263 mp_msg(MSGT_ASS
, MSGL_V
, "FreeType library version: %d.%d.%d\n",
264 vmajor
, vminor
, vpatch
);
265 mp_msg(MSGT_ASS
, MSGL_V
, "FreeType headers version: %d.%d.%d\n",
266 FREETYPE_MAJOR
, FREETYPE_MINOR
, FREETYPE_PATCH
);
268 priv
= calloc(1, sizeof(ass_renderer_t
));
270 FT_Done_FreeType(ft
);
274 priv
->synth_priv
= ass_synth_init(BLUR_MAX_RADIUS
);
276 priv
->library
= library
;
277 priv
->ftlibrary
= ft
;
278 // images_root and related stuff is zero-filled in calloc
280 ass_font_cache_init();
281 ass_bitmap_cache_init();
282 ass_composite_cache_init();
283 ass_glyph_cache_init();
285 text_info
.glyphs
= calloc(MAX_GLYPHS
, sizeof(glyph_info_t
));
288 if (priv
) mp_msg(MSGT_ASS
, MSGL_INFO
, MSGTR_LIBASS_Init
);
289 else mp_msg(MSGT_ASS
, MSGL_ERR
, MSGTR_LIBASS_InitFailed
);
294 void ass_renderer_done(ass_renderer_t
* priv
)
296 ass_font_cache_done();
297 ass_bitmap_cache_done();
298 ass_composite_cache_done();
299 ass_glyph_cache_done();
300 if (render_context
.stroker
) {
301 FT_Stroker_Done(render_context
.stroker
);
302 render_context
.stroker
= 0;
304 if (priv
&& priv
->ftlibrary
) FT_Done_FreeType(priv
->ftlibrary
);
305 if (priv
&& priv
->fontconfig_priv
) fontconfig_done(priv
->fontconfig_priv
);
306 if (priv
&& priv
->synth_priv
) ass_synth_done(priv
->synth_priv
);
307 if (priv
&& priv
->eimg
) free(priv
->eimg
);
308 if (priv
) free(priv
);
309 if (text_info
.glyphs
) free(text_info
.glyphs
);
313 * \brief Create a new ass_image_t
314 * Parameters are the same as ass_image_t fields.
316 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
)
318 ass_image_t
* img
= calloc(1, sizeof(ass_image_t
));
322 img
->stride
= stride
;
323 img
->bitmap
= bitmap
;
332 * \brief convert bitmap glyph into ass_image_t struct(s)
333 * \param bit freetype bitmap glyph, FT_PIXEL_MODE_GRAY
334 * \param dst_x bitmap x coordinate in video frame
335 * \param dst_y bitmap y coordinate in video frame
336 * \param color first color, RGBA
337 * \param color2 second color, RGBA
338 * \param brk x coordinate relative to glyph origin, color is used to the left of brk, color2 - to the right
339 * \param tail pointer to the last image's next field, head of the generated list should be stored here
340 * \return pointer to the new list tail
341 * Performs clipping. Uses my_draw_bitmap for actual bitmap convertion.
343 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
)
345 // brk is relative to dst_x
346 // color = color left of brk
347 // color2 = color right of brk
348 int b_x0
, b_y0
, b_x1
, b_y1
; // visible part of the bitmap
349 int clip_x0
, clip_y0
, clip_x1
, clip_y1
;
358 clip_x0
= render_context
.clip_x0
;
359 clip_y0
= render_context
.clip_y0
;
360 clip_x1
= render_context
.clip_x1
;
361 clip_y1
= render_context
.clip_y1
;
367 tmp
= dst_x
- clip_x0
;
369 mp_msg(MSGT_ASS
, MSGL_DBG2
, "clip left\n");
372 tmp
= dst_y
- clip_y0
;
374 mp_msg(MSGT_ASS
, MSGL_DBG2
, "clip top\n");
377 tmp
= clip_x1
- dst_x
- bm
->w
;
379 mp_msg(MSGT_ASS
, MSGL_DBG2
, "clip right\n");
382 tmp
= clip_y1
- dst_y
- bm
->h
;
384 mp_msg(MSGT_ASS
, MSGL_DBG2
, "clip bottom\n");
388 if ((b_y0
>= b_y1
) || (b_x0
>= b_x1
))
391 if (brk
> b_x0
) { // draw left part
392 if (brk
> b_x1
) brk
= b_x1
;
393 img
= my_draw_bitmap(bm
->buffer
+ bm
->w
* b_y0
+ b_x0
,
394 brk
- b_x0
, b_y1
- b_y0
, bm
->w
,
395 dst_x
+ b_x0
, dst_y
+ b_y0
, color
);
399 if (brk
< b_x1
) { // draw right part
400 if (brk
< b_x0
) brk
= b_x0
;
401 img
= my_draw_bitmap(bm
->buffer
+ bm
->w
* b_y0
+ brk
,
402 b_x1
- brk
, b_y1
- b_y0
, bm
->w
,
403 dst_x
+ brk
, dst_y
+ b_y0
, color2
);
411 * \brief Calculate overlapping area of two consecutive bitmaps and in case they
412 * overlap, composite them together
413 * Mainly useful for translucent glyphs and especially borders, to avoid the
414 * luminance adding up where they overlap (which looks ugly)
416 static void render_overlap(ass_image_t
** last_tail
, ass_image_t
** tail
, bitmap_hash_key_t
*last_hash
, bitmap_hash_key_t
* hash
) {
417 int left
, top
, bottom
, right
;
418 int old_left
, old_top
, w
, h
, cur_left
, cur_top
;
419 int x
, y
, opos
, cpos
;
421 composite_hash_key_t hk
;
422 composite_hash_val_t
*hv
;
423 composite_hash_key_t
*nhk
;
424 int ax
= (*last_tail
)->dst_x
;
425 int ay
= (*last_tail
)->dst_y
;
426 int aw
= (*last_tail
)->w
;
427 int as
= (*last_tail
)->stride
;
428 int ah
= (*last_tail
)->h
;
429 int bx
= (*tail
)->dst_x
;
430 int by
= (*tail
)->dst_y
;
432 int bs
= (*tail
)->stride
;
437 if ((*last_tail
)->bitmap
== (*tail
)->bitmap
)
440 if ((*last_tail
)->color
!= (*tail
)->color
)
443 // Calculate overlap coordinates
444 left
= (ax
> bx
) ? ax
: bx
;
445 top
= (ay
> by
) ? ay
: by
;
446 right
= ((ax
+aw
) < (bx
+bw
)) ? (ax
+aw
) : (bx
+bw
);
447 bottom
= ((ay
+ah
) < (by
+bh
)) ? (ay
+ah
) : (by
+bh
);
448 if ((right
<= left
) || (bottom
<= top
))
458 memset(&hk
, 0, sizeof(hk
));
459 memcpy(&hk
.a
, last_hash
, sizeof(*last_hash
));
460 memcpy(&hk
.b
, hash
, sizeof(*hash
));
469 hv
= cache_find_composite(&hk
);
471 (*last_tail
)->bitmap
= hv
->a
;
472 (*tail
)->bitmap
= hv
->b
;
476 // Allocate new bitmaps and copy over data
477 a
= (*last_tail
)->bitmap
;
479 (*last_tail
)->bitmap
= malloc(as
*ah
);
480 (*tail
)->bitmap
= malloc(bs
*bh
);
481 memcpy((*last_tail
)->bitmap
, a
, as
*ah
);
482 memcpy((*tail
)->bitmap
, b
, bs
*bh
);
484 // Composite overlapping area
486 for (x
=0; x
<w
; x
++) {
487 opos
= (old_top
+y
)*(as
) + (old_left
+x
);
488 cpos
= (cur_top
+y
)*(bs
) + (cur_left
+x
);
489 m
= (a
[opos
] > b
[cpos
]) ? a
[opos
] : b
[cpos
];
490 (*last_tail
)->bitmap
[opos
] = 0;
491 (*tail
)->bitmap
[cpos
] = m
;
494 // Insert bitmaps into the cache
495 nhk
= calloc(1, sizeof(*nhk
));
496 memcpy(nhk
, &hk
, sizeof(*nhk
));
497 hv
= calloc(1, sizeof(*hv
));
498 hv
->a
= (*last_tail
)->bitmap
;
499 hv
->b
= (*tail
)->bitmap
;
500 cache_add_composite(nhk
, hv
);
504 * \brief Convert text_info_t struct to ass_image_t list
505 * Splits glyphs in halves when needed (for \kf karaoke).
507 static ass_image_t
* render_text(text_info_t
* text_info
, int dst_x
, int dst_y
)
513 ass_image_t
** tail
= &head
;
514 ass_image_t
** last_tail
= 0;
515 ass_image_t
** here_tail
= 0;
516 bitmap_hash_key_t
* last_hash
= 0;
518 for (i
= 0; i
< text_info
->length
; ++i
) {
519 glyph_info_t
* info
= text_info
->glyphs
+ i
;
520 if ((info
->symbol
== 0) || (info
->symbol
== '\n') || !info
->bm_s
|| (info
->shadow
== 0))
523 pen_x
= dst_x
+ info
->pos
.x
+ ROUND(info
->shadow
* frame_context
.border_scale
);
524 pen_y
= dst_y
+ info
->pos
.y
+ ROUND(info
->shadow
* frame_context
.border_scale
);
528 tail
= render_glyph(bm
, pen_x
, pen_y
, info
->c
[3], 0, 1000000, tail
);
529 if (last_tail
&& tail
!= here_tail
&& ((info
->c
[3] & 0xff) > 0))
530 render_overlap(last_tail
, here_tail
, last_hash
, &info
->hash_key
);
531 last_tail
= here_tail
;
532 last_hash
= &info
->hash_key
;
536 for (i
= 0; i
< text_info
->length
; ++i
) {
537 glyph_info_t
* info
= text_info
->glyphs
+ i
;
538 if ((info
->symbol
== 0) || (info
->symbol
== '\n') || !info
->bm_o
)
541 pen_x
= dst_x
+ info
->pos
.x
;
542 pen_y
= dst_y
+ info
->pos
.y
;
545 if ((info
->effect_type
== EF_KARAOKE_KO
) && (info
->effect_timing
<= info
->bbox
.xMax
)) {
549 tail
= render_glyph(bm
, pen_x
, pen_y
, info
->c
[2], 0, 1000000, tail
);
550 if (last_tail
&& tail
!= here_tail
&& ((info
->c
[2] & 0xff) > 0))
551 render_overlap(last_tail
, here_tail
, last_hash
, &info
->hash_key
);
552 last_tail
= here_tail
;
553 last_hash
= &info
->hash_key
;
556 for (i
= 0; i
< text_info
->length
; ++i
) {
557 glyph_info_t
* info
= text_info
->glyphs
+ i
;
558 if ((info
->symbol
== 0) || (info
->symbol
== '\n') || !info
->bm
)
561 pen_x
= dst_x
+ info
->pos
.x
;
562 pen_y
= dst_y
+ info
->pos
.y
;
565 if ((info
->effect_type
== EF_KARAOKE
) || (info
->effect_type
== EF_KARAOKE_KO
)) {
566 if (info
->effect_timing
> info
->bbox
.xMax
)
567 tail
= render_glyph(bm
, pen_x
, pen_y
, info
->c
[0], 0, 1000000, tail
);
569 tail
= render_glyph(bm
, pen_x
, pen_y
, info
->c
[1], 0, 1000000, tail
);
570 } else if (info
->effect_type
== EF_KARAOKE_KF
) {
571 tail
= render_glyph(bm
, pen_x
, pen_y
, info
->c
[0], info
->c
[1], info
->effect_timing
, tail
);
573 tail
= render_glyph(bm
, pen_x
, pen_y
, info
->c
[0], 0, 1000000, tail
);
581 * \brief Mapping between script and screen coordinates
583 static int x2scr(double x
) {
584 return x
*frame_context
.orig_width_nocrop
/ frame_context
.track
->PlayResX
+
585 FFMAX(global_settings
->left_margin
, 0);
587 static double x2scr_pos(double x
) {
588 return x
*frame_context
.orig_width
/ frame_context
.track
->PlayResX
+
589 global_settings
->left_margin
;
592 * \brief Mapping between script and screen coordinates
594 static double y2scr(double y
) {
595 return y
* frame_context
.orig_height_nocrop
/ frame_context
.track
->PlayResY
+
596 FFMAX(global_settings
->top_margin
, 0);
598 static double y2scr_pos(double y
) {
599 return y
* frame_context
.orig_height
/ frame_context
.track
->PlayResY
+
600 global_settings
->top_margin
;
603 // the same for toptitles
604 static int y2scr_top(double y
) {
605 if (global_settings
->use_margins
)
606 return y
* frame_context
.orig_height_nocrop
/ frame_context
.track
->PlayResY
;
608 return y
* frame_context
.orig_height_nocrop
/ frame_context
.track
->PlayResY
+
609 FFMAX(global_settings
->top_margin
, 0);
611 // the same for subtitles
612 static int y2scr_sub(double y
) {
613 if (global_settings
->use_margins
)
614 return y
* frame_context
.orig_height_nocrop
/ frame_context
.track
->PlayResY
+
615 FFMAX(global_settings
->top_margin
, 0) +
616 FFMAX(global_settings
->bottom_margin
, 0);
618 return y
* frame_context
.orig_height_nocrop
/ frame_context
.track
->PlayResY
+
619 FFMAX(global_settings
->top_margin
, 0);
622 static void compute_string_bbox( text_info_t
* info
, FT_BBox
*abbox
) {
626 if (text_info
.length
> 0) {
629 bbox
.yMin
= - d6_to_int(text_info
.lines
[0].asc
) + text_info
.glyphs
[0].pos
.y
;
630 bbox
.yMax
= d6_to_int(text_info
.height
- text_info
.lines
[0].asc
) + text_info
.glyphs
[0].pos
.y
;
632 for (i
= 0; i
< text_info
.length
; ++i
) {
633 int s
= text_info
.glyphs
[i
].pos
.x
;
634 int e
= s
+ d6_to_int(text_info
.glyphs
[i
].advance
.x
);
635 bbox
.xMin
= FFMIN(bbox
.xMin
, s
);
636 bbox
.xMax
= FFMAX(bbox
.xMax
, e
);
639 bbox
.xMin
= bbox
.xMax
= bbox
.yMin
= bbox
.yMax
= 0;
641 /* return string bbox */
647 * \brief Check if starting part of (*p) matches sample. If true, shift p to the first symbol after the matching part.
649 static inline int mystrcmp(char** p
, const char* sample
) {
650 int len
= strlen(sample
);
651 if (strncmp(*p
, sample
, len
) == 0) {
658 static void change_font_size(double sz
)
660 double size
= sz
* frame_context
.font_scale
;
664 else if (size
> frame_context
.height
* 2)
665 size
= frame_context
.height
* 2;
667 ass_font_set_size(render_context
.font
, size
);
669 render_context
.font_size
= sz
;
673 * \brief Change current font, using setting from render_context.
675 static void update_font(void)
678 ass_renderer_t
* priv
= frame_context
.ass_priv
;
679 ass_font_desc_t desc
;
680 desc
.family
= strdup(render_context
.family
);
681 desc
.treat_family_as_pattern
= render_context
.treat_family_as_pattern
;
683 val
= render_context
.bold
;
684 // 0 = normal, 1 = bold, >1 = exact weight
685 if (val
== 0) val
= 80; // normal
686 else if (val
== 1) val
= 200; // bold
689 val
= render_context
.italic
;
690 if (val
== 0) val
= 0; // normal
691 else if (val
== 1) val
= 110; //italic
694 render_context
.font
= ass_font_new(priv
->library
, priv
->ftlibrary
, priv
->fontconfig_priv
, &desc
);
697 if (render_context
.font
)
698 change_font_size(render_context
.font_size
);
702 * \brief Change border width
703 * negative value resets border to style value
705 static void change_border(double border
)
708 if (!render_context
.font
) return;
711 if (render_context
.style
->BorderStyle
== 1)
712 border
= render_context
.style
->Outline
;
716 render_context
.border
= border
;
718 b
= 64 * border
* frame_context
.border_scale
;
720 if (!render_context
.stroker
) {
722 #if (FREETYPE_MAJOR > 2) || ((FREETYPE_MAJOR == 2) && (FREETYPE_MINOR > 1))
723 error
= FT_Stroker_New( ass_renderer
->ftlibrary
, &render_context
.stroker
);
725 error
= FT_Stroker_New( render_context
.font
->faces
[0]->memory
, &render_context
.stroker
);
728 mp_msg(MSGT_ASS
, MSGL_V
, "failed to get stroker\n");
729 render_context
.stroker
= 0;
732 if (render_context
.stroker
)
733 FT_Stroker_Set( render_context
.stroker
, b
,
734 FT_STROKER_LINECAP_ROUND
,
735 FT_STROKER_LINEJOIN_ROUND
,
738 FT_Stroker_Done(render_context
.stroker
);
739 render_context
.stroker
= 0;
743 #define _r(c) ((c)>>24)
744 #define _g(c) (((c)>>16)&0xFF)
745 #define _b(c) (((c)>>8)&0xFF)
746 #define _a(c) ((c)&0xFF)
749 * \brief Calculate a weighted average of two colors
750 * calculates c1*(1-a) + c2*a, but separately for each component except alpha
752 static void change_color(uint32_t* var
, uint32_t new, double pwr
)
754 (*var
)= ((uint32_t)(_r(*var
) * (1 - pwr
) + _r(new) * pwr
) << 24) +
755 ((uint32_t)(_g(*var
) * (1 - pwr
) + _g(new) * pwr
) << 16) +
756 ((uint32_t)(_b(*var
) * (1 - pwr
) + _b(new) * pwr
) << 8) +
760 // like change_color, but for alpha component only
761 static void change_alpha(uint32_t* var
, uint32_t new, double pwr
)
763 *var
= (_r(*var
) << 24) + (_g(*var
) << 16) + (_b(*var
) << 8) + (_a(*var
) * (1 - pwr
) + _a(new) * pwr
);
767 * \brief Multiply two alpha values
768 * \param a first value
769 * \param b second value
770 * \return result of multiplication
771 * Parameters and result are limited by 0xFF.
773 static uint32_t mult_alpha(uint32_t a
, uint32_t b
)
775 return 0xFF - (0xFF - a
) * (0xFF - b
) / 0xFF;
779 * \brief Calculate alpha value by piecewise linear function
780 * Used for \fad, \fade implementation.
782 static unsigned interpolate_alpha(long long now
,
783 long long t1
, long long t2
, long long t3
, long long t4
,
784 unsigned a1
, unsigned a2
, unsigned a3
)
790 } else if (now
>= t4
) {
792 } else if (now
< t2
) { // and > t1
793 cf
= ((double)(now
- t1
)) / (t2
- t1
);
794 a
= a1
* (1 - cf
) + a2
* cf
;
795 } else if (now
> t3
) {
796 cf
= ((double)(now
- t3
)) / (t4
- t3
);
797 a
= a2
* (1 - cf
) + a3
* cf
;
798 } else { // t2 <= now <= t3
805 static void reset_render_context(void);
808 * \brief Parse style override tag.
809 * \param p string to parse
810 * \param pwr multiplier for some tag effects (comes from \t tags)
812 static char* parse_tag(char* p
, double pwr
) {
813 #define skip_to(x) while ((*p != (x)) && (*p != '}') && (*p != 0)) { ++p;}
814 #define skip(x) if (*p == (x)) ++p; else { return p; }
818 if ((*p
== '}') || (*p
== 0))
821 // New tags introduced in vsfilter 2.39
822 if (mystrcmp(&p
, "xbord")) {
824 if (mystrtod(&p
, &val
))
825 mp_msg(MSGT_ASS
, MSGL_V
, "stub: \\xbord%.2f\n", val
);
826 } else if (mystrcmp(&p
, "ybord")) {
828 if (mystrtod(&p
, &val
))
829 mp_msg(MSGT_ASS
, MSGL_V
, "stub: \\ybord%.2f\n", val
);
830 } else if (mystrcmp(&p
, "xshad")) {
832 if (mystrtoi(&p
, &val
))
833 mp_msg(MSGT_ASS
, MSGL_V
, "stub: \\xshad%d\n", val
);
834 } else if (mystrcmp(&p
, "yshad")) {
836 if (mystrtoi(&p
, &val
))
837 mp_msg(MSGT_ASS
, MSGL_V
, "stub: \\yshad%d\n", val
);
838 } else if (mystrcmp(&p
, "fax")) {
840 if (mystrtoi(&p
, &val
))
841 mp_msg(MSGT_ASS
, MSGL_V
, "stub: \\fax%d\n", val
);
842 } else if (mystrcmp(&p
, "fay")) {
844 if (mystrtoi(&p
, &val
))
845 mp_msg(MSGT_ASS
, MSGL_V
, "stub: \\fay%d\n", val
);
846 } else if (mystrcmp(&p
, "iclip")) {
850 res
&= mystrtoi(&p
, &x0
);
852 res
&= mystrtoi(&p
, &y0
);
854 res
&= mystrtoi(&p
, &x1
);
856 res
&= mystrtoi(&p
, &y1
);
858 mp_msg(MSGT_ASS
, MSGL_V
, "stub: \\iclip(%d,%d,%d,%d)\n", x0
, y0
, x1
, y1
);
859 } else if (mystrcmp(&p
, "blur")) {
861 if (mystrtod(&p
, &val
)) {
862 val
= (val
< 0) ? 0 : val
;
863 val
= (val
> BLUR_MAX_RADIUS
) ? BLUR_MAX_RADIUS
: val
;
864 render_context
.blur
= val
;
866 render_context
.blur
= 0.0;
868 } else if (mystrcmp(&p
, "fsc")) {
872 if (mystrtod(&p
, &val
)) {
874 render_context
.scale_x
= render_context
.scale_x
* ( 1 - pwr
) + val
* pwr
;
876 render_context
.scale_x
= render_context
.style
->ScaleX
;
877 } else if (tp
== 'y') {
878 if (mystrtod(&p
, &val
)) {
880 render_context
.scale_y
= render_context
.scale_y
* ( 1 - pwr
) + val
* pwr
;
882 render_context
.scale_y
= render_context
.style
->ScaleY
;
884 } else if (mystrcmp(&p
, "fsp")) {
886 if (mystrtod(&p
, &val
))
887 render_context
.hspacing
= render_context
.hspacing
* ( 1 - pwr
) + val
* pwr
;
889 render_context
.hspacing
= render_context
.style
->Spacing
;
890 } else if (mystrcmp(&p
, "fs")) {
892 if (mystrtod(&p
, &val
))
893 val
= render_context
.font_size
* ( 1 - pwr
) + val
* pwr
;
895 val
= render_context
.style
->FontSize
;
896 if (render_context
.font
)
897 change_font_size(val
);
898 } else if (mystrcmp(&p
, "bord")) {
900 if (mystrtod(&p
, &val
))
901 val
= render_context
.border
* ( 1 - pwr
) + val
* pwr
;
903 val
= -1.; // reset to default
905 } else if (mystrcmp(&p
, "move")) {
906 double x1
, x2
, y1
, y2
;
907 long long t1
, t2
, delta_t
, t
;
923 mp_msg(MSGT_ASS
, MSGL_DBG2
, "movement6: (%f, %f) -> (%f, %f), (%" PRId64
" .. %" PRId64
")\n",
924 x1
, y1
, x2
, y2
, (int64_t)t1
, (int64_t)t2
);
927 t2
= render_context
.event
->Duration
;
928 mp_msg(MSGT_ASS
, MSGL_DBG2
, "movement: (%f, %f) -> (%f, %f)\n", x1
, y1
, x2
, y2
);
932 t
= frame_context
.time
- render_context
.event
->Start
;
937 else k
= ((double)(t
- t1
)) / delta_t
;
938 x
= k
* (x2
- x1
) + x1
;
939 y
= k
* (y2
- y1
) + y1
;
940 if (render_context
.evt_type
!= EVENT_POSITIONED
) {
941 render_context
.pos_x
= x
;
942 render_context
.pos_y
= y
;
943 render_context
.detect_collisions
= 0;
944 render_context
.evt_type
= EVENT_POSITIONED
;
946 } else if (mystrcmp(&p
, "frx")) {
948 if (mystrtod(&p
, &val
)) {
950 render_context
.frx
= val
* pwr
+ render_context
.frx
* (1-pwr
);
952 render_context
.frx
= 0.;
953 } else if (mystrcmp(&p
, "fry")) {
955 if (mystrtod(&p
, &val
)) {
957 render_context
.fry
= val
* pwr
+ render_context
.fry
* (1-pwr
);
959 render_context
.fry
= 0.;
960 } else if (mystrcmp(&p
, "frz") || mystrcmp(&p
, "fr")) {
962 if (mystrtod(&p
, &val
)) {
964 render_context
.frz
= val
* pwr
+ render_context
.frz
* (1-pwr
);
966 render_context
.frz
= M_PI
* render_context
.style
->Angle
/ 180.;
967 } else if (mystrcmp(&p
, "fn")) {
972 family
= malloc(p
- start
+ 1);
973 strncpy(family
, start
, p
- start
);
974 family
[p
- start
] = '\0';
976 family
= strdup(render_context
.style
->FontName
);
977 if (render_context
.family
)
978 free(render_context
.family
);
979 render_context
.family
= family
;
981 } else if (mystrcmp(&p
, "alpha")) {
984 if (strtocolor(&p
, &val
)) {
985 unsigned char a
= val
>> 24;
986 for (i
= 0; i
< 4; ++i
)
987 change_alpha(&render_context
.c
[i
], a
, pwr
);
989 change_alpha(&render_context
.c
[0], render_context
.style
->PrimaryColour
, pwr
);
990 change_alpha(&render_context
.c
[1], render_context
.style
->SecondaryColour
, pwr
);
991 change_alpha(&render_context
.c
[2], render_context
.style
->OutlineColour
, pwr
);
992 change_alpha(&render_context
.c
[3], render_context
.style
->BackColour
, pwr
);
995 } else if (mystrcmp(&p
, "an")) {
997 if (mystrtoi(&p
, &val
) && val
) {
998 int v
= (val
- 1) / 3; // 0, 1 or 2 for vertical alignment
999 mp_msg(MSGT_ASS
, MSGL_DBG2
, "an %d\n", val
);
1000 if (v
!= 0) v
= 3 - v
;
1001 val
= ((val
- 1) % 3) + 1; // horizontal alignment
1003 mp_msg(MSGT_ASS
, MSGL_DBG2
, "align %d\n", val
);
1004 render_context
.alignment
= val
;
1006 render_context
.alignment
= render_context
.style
->Alignment
;
1007 } else if (mystrcmp(&p
, "a")) {
1009 if (mystrtoi(&p
, &val
) && val
)
1010 render_context
.alignment
= val
;
1012 render_context
.alignment
= render_context
.style
->Alignment
;
1013 } else if (mystrcmp(&p
, "pos")) {
1020 mp_msg(MSGT_ASS
, MSGL_DBG2
, "pos(%f, %f)\n", v1
, v2
);
1021 if (render_context
.evt_type
== EVENT_POSITIONED
) {
1022 mp_msg(MSGT_ASS
, MSGL_V
, "Subtitle has a new \\pos "
1023 "after \\move or \\pos, ignoring\n");
1025 render_context
.evt_type
= EVENT_POSITIONED
;
1026 render_context
.detect_collisions
= 0;
1027 render_context
.pos_x
= v1
;
1028 render_context
.pos_y
= v2
;
1030 } else if (mystrcmp(&p
, "fad")) {
1032 long long t1
, t2
, t3
, t4
;
1033 if (*p
== 'e') ++p
; // either \fad or \fade
1039 // 2-argument version (\fad, according to specs)
1040 // a1 and a2 are fade-in and fade-out durations
1042 t4
= render_context
.event
->Duration
;
1049 // 6-argument version (\fade)
1050 // a1 and a2 (and a3) are opacity values
1063 render_context
.fade
= interpolate_alpha(frame_context
.time
- render_context
.event
->Start
, t1
, t2
, t3
, t4
, a1
, a2
, a3
);
1064 } else if (mystrcmp(&p
, "org")) {
1071 mp_msg(MSGT_ASS
, MSGL_DBG2
, "org(%d, %d)\n", v1
, v2
);
1072 // render_context.evt_type = EVENT_POSITIONED;
1073 if (!render_context
.have_origin
) {
1074 render_context
.org_x
= v1
;
1075 render_context
.org_y
= v2
;
1076 render_context
.have_origin
= 1;
1077 render_context
.detect_collisions
= 0;
1079 } else if (mystrcmp(&p
, "t")) {
1084 long long t1
, t2
, t
, delta_t
;
1087 for (cnt
= 0; cnt
< 3; ++cnt
) {
1090 v
[cnt
] = strtod(p
, &p
);
1094 v1
= v
[0]; v2
= v
[1]; v3
= v
[2];
1095 } else if (cnt
== 2) {
1096 v1
= v
[0]; v2
= v
[1]; v3
= 1.;
1097 } else if (cnt
== 1) {
1098 v1
= 0; v2
= render_context
.event
->Duration
; v3
= v
[0];
1099 } else { // cnt == 0
1100 v1
= 0; v2
= render_context
.event
->Duration
; v3
= 1.;
1102 render_context
.detect_collisions
= 0;
1108 t
= frame_context
.time
- render_context
.event
->Start
; // FIXME: move to render_context
1114 assert(delta_t
!= 0.);
1115 k
= pow(((double)(t
- t1
)) / delta_t
, v3
);
1118 p
= parse_tag(p
, k
); // maybe k*pwr ? no, specs forbid nested \t's
1119 skip_to(')'); // in case there is some unknown tag or a comment
1121 } else if (mystrcmp(&p
, "clip")) {
1125 res
&= mystrtoi(&p
, &x0
);
1127 res
&= mystrtoi(&p
, &y0
);
1129 res
&= mystrtoi(&p
, &x1
);
1131 res
&= mystrtoi(&p
, &y1
);
1134 render_context
.clip_x0
= render_context
.clip_x0
* (1-pwr
) + x0
* pwr
;
1135 render_context
.clip_x1
= render_context
.clip_x1
* (1-pwr
) + x1
* pwr
;
1136 render_context
.clip_y0
= render_context
.clip_y0
* (1-pwr
) + y0
* pwr
;
1137 render_context
.clip_y1
= render_context
.clip_y1
* (1-pwr
) + y1
* pwr
;
1139 render_context
.clip_x0
= 0;
1140 render_context
.clip_y0
= 0;
1141 render_context
.clip_x1
= frame_context
.track
->PlayResX
;
1142 render_context
.clip_y1
= frame_context
.track
->PlayResY
;
1144 } else if (mystrcmp(&p
, "c")) {
1146 if (!strtocolor(&p
, &val
))
1147 val
= render_context
.style
->PrimaryColour
;
1148 mp_msg(MSGT_ASS
, MSGL_DBG2
, "color: %X\n", val
);
1149 change_color(&render_context
.c
[0], val
, pwr
);
1150 } else if ((*p
>= '1') && (*p
<= '4') && (++p
) && (mystrcmp(&p
, "c") || mystrcmp(&p
, "a"))) {
1155 assert((n
>= '1') && (n
<= '4'));
1156 if (!strtocolor(&p
, &val
))
1158 case '1': val
= render_context
.style
->PrimaryColour
; break;
1159 case '2': val
= render_context
.style
->SecondaryColour
; break;
1160 case '3': val
= render_context
.style
->OutlineColour
; break;
1161 case '4': val
= render_context
.style
->BackColour
; break;
1162 default : val
= 0; break; // impossible due to assert; avoid compilation warning
1165 case 'c': change_color(render_context
.c
+ cidx
, val
, pwr
); break;
1166 case 'a': change_alpha(render_context
.c
+ cidx
, val
>> 24, pwr
); break;
1167 default: mp_msg(MSGT_ASS
, MSGL_WARN
, MSGTR_LIBASS_BadCommand
, n
, cmd
); break;
1169 mp_msg(MSGT_ASS
, MSGL_DBG2
, "single c/a at %f: %c%c = %X \n", pwr
, n
, cmd
, render_context
.c
[cidx
]);
1170 } else if (mystrcmp(&p
, "r")) {
1171 reset_render_context();
1172 } else if (mystrcmp(&p
, "be")) {
1174 if (mystrtoi(&p
, &val
)) {
1175 // Clamp to a safe upper limit, since high values need excessive CPU
1176 val
= (val
< 0) ? 0 : val
;
1177 val
= (val
> MAX_BE
) ? MAX_BE
: val
;
1178 render_context
.be
= val
;
1180 render_context
.be
= 0;
1181 } else if (mystrcmp(&p
, "b")) {
1183 if (mystrtoi(&p
, &b
)) {
1185 render_context
.bold
= b
;
1187 render_context
.bold
= render_context
.style
->Bold
;
1189 } else if (mystrcmp(&p
, "i")) {
1191 if (mystrtoi(&p
, &i
)) {
1193 render_context
.italic
= i
;
1195 render_context
.italic
= render_context
.style
->Italic
;
1197 } else if (mystrcmp(&p
, "kf") || mystrcmp(&p
, "K")) {
1200 render_context
.effect_type
= EF_KARAOKE_KF
;
1201 if (render_context
.effect_timing
)
1202 render_context
.effect_skip_timing
+= render_context
.effect_timing
;
1203 render_context
.effect_timing
= val
* 10;
1204 } else if (mystrcmp(&p
, "ko")) {
1207 render_context
.effect_type
= EF_KARAOKE_KO
;
1208 if (render_context
.effect_timing
)
1209 render_context
.effect_skip_timing
+= render_context
.effect_timing
;
1210 render_context
.effect_timing
= val
* 10;
1211 } else if (mystrcmp(&p
, "k")) {
1214 render_context
.effect_type
= EF_KARAOKE
;
1215 if (render_context
.effect_timing
)
1216 render_context
.effect_skip_timing
+= render_context
.effect_timing
;
1217 render_context
.effect_timing
= val
* 10;
1218 } else if (mystrcmp(&p
, "shad")) {
1220 if (mystrtoi(&p
, &val
))
1221 render_context
.shadow
= val
;
1223 render_context
.shadow
= render_context
.style
->Shadow
;
1224 } else if (mystrcmp(&p
, "pbo")) {
1226 mystrtoi(&p
, &val
); // ignored
1227 } else if (mystrcmp(&p
, "p")) {
1229 if (!mystrtoi(&p
, &val
))
1231 render_context
.drawing_mode
= !!val
;
1241 * \brief Get next ucs4 char from string, parsing and executing style overrides
1242 * \param str string pointer
1243 * \return ucs4 code of the next char
1244 * On return str points to the unparsed part of the string
1246 static unsigned get_next_char(char** str
)
1250 if (*p
== '{') { // '\0' goes here
1253 p
= parse_tag(p
, 1.);
1254 if (*p
== '}') { // end of tag
1261 } else if (*p
!= '\\')
1262 mp_msg(MSGT_ASS
, MSGL_V
, "Unable to parse: \"%s\" \n", p
);
1273 if ((*(p
+1) == 'N') || ((*(p
+1) == 'n') && (frame_context
.track
->WrapStyle
== 2))) {
1277 } else if ((*(p
+1) == 'n') || (*(p
+1) == 'h')) {
1283 chr
= utf8_get_char((const char **)&p
);
1288 static void apply_transition_effects(ass_event_t
* event
)
1292 char* p
= event
->Effect
;
1294 if (!p
|| !*p
) return;
1297 while (cnt
< 4 && (p
= strchr(p
, ';'))) {
1298 v
[cnt
++] = atoi(++p
);
1301 if (strncmp(event
->Effect
, "Banner;", 7) == 0) {
1304 mp_msg(MSGT_ASS
, MSGL_V
, "Error parsing effect: %s \n", event
->Effect
);
1307 if (cnt
>= 2 && v
[1] == 0) // right-to-left
1308 render_context
.scroll_direction
= SCROLL_RL
;
1309 else // left-to-right
1310 render_context
.scroll_direction
= SCROLL_LR
;
1313 if (delay
== 0) delay
= 1; // ?
1314 render_context
.scroll_shift
= (frame_context
.time
- render_context
.event
->Start
) / delay
;
1315 render_context
.evt_type
= EVENT_HSCROLL
;
1319 if (strncmp(event
->Effect
, "Scroll up;", 10) == 0) {
1320 render_context
.scroll_direction
= SCROLL_BT
;
1321 } else if (strncmp(event
->Effect
, "Scroll down;", 12) == 0) {
1322 render_context
.scroll_direction
= SCROLL_TB
;
1324 mp_msg(MSGT_ASS
, MSGL_V
, "Unknown transition effect: %s \n", event
->Effect
);
1327 // parse scroll up/down parameters
1332 mp_msg(MSGT_ASS
, MSGL_V
, "Error parsing effect: %s \n", event
->Effect
);
1336 if (delay
== 0) delay
= 1; // ?
1337 render_context
.scroll_shift
= (frame_context
.time
- render_context
.event
->Start
) / delay
;
1339 y0
= v
[0]; y1
= v
[1];
1341 y0
= v
[1]; y1
= v
[0];
1344 y1
= frame_context
.track
->PlayResY
; // y0=y1=0 means fullscreen scrolling
1345 render_context
.clip_y0
= y0
;
1346 render_context
.clip_y1
= y1
;
1347 render_context
.evt_type
= EVENT_VSCROLL
;
1348 render_context
.detect_collisions
= 0;
1354 * \brief partially reset render_context to style values
1355 * Works like {\r}: resets some style overrides
1357 static void reset_render_context(void)
1359 render_context
.c
[0] = render_context
.style
->PrimaryColour
;
1360 render_context
.c
[1] = render_context
.style
->SecondaryColour
;
1361 render_context
.c
[2] = render_context
.style
->OutlineColour
;
1362 render_context
.c
[3] = render_context
.style
->BackColour
;
1363 render_context
.font_size
= render_context
.style
->FontSize
;
1365 if (render_context
.family
)
1366 free(render_context
.family
);
1367 render_context
.family
= strdup(render_context
.style
->FontName
);
1368 render_context
.treat_family_as_pattern
= render_context
.style
->treat_fontname_as_pattern
;
1369 render_context
.bold
= render_context
.style
->Bold
;
1370 render_context
.italic
= render_context
.style
->Italic
;
1374 render_context
.scale_x
= render_context
.style
->ScaleX
;
1375 render_context
.scale_y
= render_context
.style
->ScaleY
;
1376 render_context
.hspacing
= render_context
.style
->Spacing
;
1377 render_context
.be
= 0;
1378 render_context
.blur
= 0.0;
1379 render_context
.shadow
= render_context
.style
->Shadow
;
1380 render_context
.frx
= render_context
.fry
= 0.;
1381 render_context
.frz
= M_PI
* render_context
.style
->Angle
/ 180.;
1383 // FIXME: does not reset unsupported attributes.
1387 * \brief Start new event. Reset render_context.
1389 static void init_render_context(ass_event_t
* event
)
1391 render_context
.event
= event
;
1392 render_context
.style
= frame_context
.track
->styles
+ event
->Style
;
1394 reset_render_context();
1396 render_context
.evt_type
= EVENT_NORMAL
;
1397 render_context
.alignment
= render_context
.style
->Alignment
;
1398 render_context
.pos_x
= 0;
1399 render_context
.pos_y
= 0;
1400 render_context
.org_x
= 0;
1401 render_context
.org_y
= 0;
1402 render_context
.have_origin
= 0;
1403 render_context
.clip_x0
= 0;
1404 render_context
.clip_y0
= 0;
1405 render_context
.clip_x1
= frame_context
.track
->PlayResX
;
1406 render_context
.clip_y1
= frame_context
.track
->PlayResY
;
1407 render_context
.detect_collisions
= 1;
1408 render_context
.fade
= 0;
1409 render_context
.drawing_mode
= 0;
1410 render_context
.effect_type
= EF_NONE
;
1411 render_context
.effect_timing
= 0;
1412 render_context
.effect_skip_timing
= 0;
1414 apply_transition_effects(event
);
1417 static void free_render_context(void)
1422 * \brief Get normal and outline (border) glyphs
1423 * \param symbol ucs4 char
1424 * \param info out: struct filled with extracted data
1425 * \param advance subpixel shift vector used for cache lookup
1426 * Tries to get both glyphs from cache.
1427 * If they can't be found, gets a glyph from font face, generates outline with FT_Stroker,
1428 * and add them to cache.
1429 * The glyphs are returned in info->glyph and info->outline_glyph
1431 static void get_outline_glyph(int symbol
, glyph_info_t
* info
, FT_Vector
* advance
)
1434 glyph_hash_val_t
* val
;
1435 glyph_hash_key_t key
;
1436 memset(&key
, 0, sizeof(key
));
1437 key
.font
= render_context
.font
;
1438 key
.size
= render_context
.font_size
;
1440 key
.scale_x
= (render_context
.scale_x
* 0xFFFF);
1441 key
.scale_y
= (render_context
.scale_y
* 0xFFFF);
1442 key
.advance
= *advance
;
1443 key
.bold
= render_context
.bold
;
1444 key
.italic
= render_context
.italic
;
1445 key
.outline
= render_context
.border
* 0xFFFF;
1447 memset(info
, 0, sizeof(glyph_info_t
));
1449 val
= cache_find_glyph(&key
);
1451 FT_Glyph_Copy(val
->glyph
, &info
->glyph
);
1452 if (val
->outline_glyph
)
1453 FT_Glyph_Copy(val
->outline_glyph
, &info
->outline_glyph
);
1454 info
->bbox
= val
->bbox_scaled
;
1455 info
->advance
.x
= val
->advance
.x
;
1456 info
->advance
.y
= val
->advance
.y
;
1459 info
->glyph
= ass_font_get_glyph(frame_context
.ass_priv
->fontconfig_priv
, render_context
.font
, symbol
, global_settings
->hinting
);
1462 info
->advance
.x
= d16_to_d6(info
->glyph
->advance
.x
);
1463 info
->advance
.y
= d16_to_d6(info
->glyph
->advance
.y
);
1464 FT_Glyph_Get_CBox( info
->glyph
, FT_GLYPH_BBOX_PIXELS
, &info
->bbox
);
1466 if (render_context
.stroker
) {
1467 info
->outline_glyph
= info
->glyph
;
1468 error
= FT_Glyph_StrokeBorder( &(info
->outline_glyph
), render_context
.stroker
, 0 , 0 ); // don't destroy original
1470 mp_msg(MSGT_ASS
, MSGL_WARN
, MSGTR_LIBASS_FT_Glyph_Stroke_Error
, error
);
1474 memset(&v
, 0, sizeof(v
));
1475 FT_Glyph_Copy(info
->glyph
, &v
.glyph
);
1476 if (info
->outline_glyph
)
1477 FT_Glyph_Copy(info
->outline_glyph
, &v
.outline_glyph
);
1478 v
.advance
= info
->advance
;
1479 v
.bbox_scaled
= info
->bbox
;
1480 cache_add_glyph(&key
, &v
);
1484 static void transform_3d(FT_Vector shift
, FT_Glyph
* glyph
, FT_Glyph
* glyph2
, double frx
, double fry
, double frz
);
1487 * \brief Get bitmaps for a glyph
1488 * \param info glyph info
1489 * Tries to get glyph bitmaps from bitmap cache.
1490 * If they can't be found, they are generated by rotating and rendering the glyph.
1491 * After that, bitmaps are added to the cache.
1492 * They are returned in info->bm (glyph), info->bm_o (outline) and info->bm_s (shadow).
1494 static void get_bitmap_glyph(glyph_info_t
* info
)
1496 bitmap_hash_val_t
* val
;
1497 bitmap_hash_key_t
* key
= &info
->hash_key
;
1499 val
= cache_find_bitmap(key
);
1504 info
->bm_o
= val
->bm_o
;
1505 info
->bm_s
= val
->bm_s
;
1508 bitmap_hash_val_t hash_val
;
1510 info
->bm
= info
->bm_o
= info
->bm_s
= 0;
1511 if (info
->glyph
&& info
->symbol
!= '\n' && info
->symbol
!= 0) {
1512 // calculating rotation shift vector (from rotation origin to the glyph basepoint)
1513 shift
.x
= int_to_d6(info
->hash_key
.shift_x
);
1514 shift
.y
= int_to_d6(info
->hash_key
.shift_y
);
1516 transform_3d(shift
, &info
->glyph
, &info
->outline_glyph
, info
->frx
, info
->fry
, info
->frz
);
1519 error
= glyph_to_bitmap(ass_renderer
->synth_priv
,
1520 info
->glyph
, info
->outline_glyph
,
1521 &info
->bm
, &info
->bm_o
,
1522 &info
->bm_s
, info
->be
, info
->blur
* frame_context
.border_scale
);
1526 // add bitmaps to cache
1527 hash_val
.bm_o
= info
->bm_o
;
1528 hash_val
.bm
= info
->bm
;
1529 hash_val
.bm_s
= info
->bm_s
;
1530 cache_add_bitmap(&(info
->hash_key
), &hash_val
);
1533 // deallocate glyphs
1535 FT_Done_Glyph(info
->glyph
);
1536 if (info
->outline_glyph
)
1537 FT_Done_Glyph(info
->outline_glyph
);
1541 * This function goes through text_info and calculates text parameters.
1542 * The following text_info fields are filled:
1548 static void measure_text(void)
1550 int cur_line
= 0, max_asc
= 0, max_desc
= 0;
1552 text_info
.height
= 0;
1553 for (i
= 0; i
< text_info
.length
+ 1; ++i
) {
1554 if ((i
== text_info
.length
) || text_info
.glyphs
[i
].linebreak
) {
1555 text_info
.lines
[cur_line
].asc
= max_asc
;
1556 text_info
.lines
[cur_line
].desc
= max_desc
;
1557 text_info
.height
+= max_asc
+ max_desc
;
1559 max_asc
= max_desc
= 0;
1561 if (i
< text_info
.length
) {
1562 glyph_info_t
* cur
= text_info
.glyphs
+ i
;
1563 if (cur
->asc
> max_asc
)
1565 if (cur
->desc
> max_desc
)
1566 max_desc
= cur
->desc
;
1569 text_info
.height
+= (text_info
.n_lines
- 1) * double_to_d6(global_settings
->line_spacing
);
1573 * \brief rearrange text between lines
1574 * \param max_text_width maximal text line width in pixels
1575 * The algo is similar to the one in libvo/sub.c:
1576 * 1. Place text, wrapping it when current line is full
1577 * 2. Try moving words from the end of a line to the beginning of the next one while it reduces
1578 * the difference in lengths between this two lines.
1579 * The result may not be optimal, but usually is good enough.
1581 static void wrap_lines_smart(int max_text_width
)
1584 glyph_info_t
*cur
, *s1
, *e1
, *s2
, *s3
, *w
;
1593 text_info
.n_lines
= 1;
1595 s1
= text_info
.glyphs
; // current line start
1596 for (i
= 0; i
< text_info
.length
; ++i
) {
1597 int break_at
, s_offset
, len
;
1598 cur
= text_info
.glyphs
+ i
;
1600 s_offset
= s1
->bbox
.xMin
+ s1
->pos
.x
;
1601 len
= (cur
->bbox
.xMax
+ cur
->pos
.x
) - s_offset
;
1603 if (cur
->symbol
== '\n') {
1606 mp_msg(MSGT_ASS
, MSGL_DBG2
, "forced line break at %d\n", break_at
);
1609 if ((len
>= max_text_width
) && (frame_context
.track
->WrapStyle
!= 2)) {
1611 break_at
= last_space
;
1616 mp_msg(MSGT_ASS
, MSGL_DBG2
, "overfill at %d\n", i
);
1617 mp_msg(MSGT_ASS
, MSGL_DBG2
, "line break at %d\n", break_at
);
1620 if (break_at
!= -1) {
1621 // need to use one more line
1622 // marking break_at+1 as start of a new line
1623 int lead
= break_at
+ 1; // the first symbol of the new line
1624 if (text_info
.n_lines
>= MAX_LINES
) {
1626 // no more linebreaks
1627 for (j
= lead
; j
< text_info
.length
; ++j
)
1628 text_info
.glyphs
[j
].linebreak
= 0;
1631 if (lead
< text_info
.length
)
1632 text_info
.glyphs
[lead
].linebreak
= break_type
;
1634 s1
= text_info
.glyphs
+ lead
;
1635 s_offset
= s1
->bbox
.xMin
+ s1
->pos
.x
;
1636 text_info
.n_lines
++;
1639 if (cur
->symbol
== ' ')
1642 // make sure the hard linebreak is not forgotten when
1643 // there was a new soft linebreak just inserted
1644 if (cur
->symbol
== '\n' && break_type
== 1)
1647 #define DIFF(x,y) (((x) < (y)) ? (y - x) : (x - y))
1651 w
= s3
= text_info
.glyphs
;
1653 for (i
= 0; i
<= text_info
.length
; ++i
) {
1654 cur
= text_info
.glyphs
+ i
;
1655 if ((i
== text_info
.length
) || cur
->linebreak
) {
1659 if (s1
&& (s2
->linebreak
== 1)) { // have at least 2 lines, and linebreak is 'soft'
1660 int l1
, l2
, l1_new
, l2_new
;
1663 do { --w
; } while ((w
> s1
) && (w
->symbol
== ' '));
1664 while ((w
> s1
) && (w
->symbol
!= ' ')) { --w
; }
1666 while ((e1
> s1
) && (e1
->symbol
== ' ')) { --e1
; }
1667 if (w
->symbol
== ' ') ++w
;
1669 l1
= ((s2
-1)->bbox
.xMax
+ (s2
-1)->pos
.x
) - (s1
->bbox
.xMin
+ s1
->pos
.x
);
1670 l2
= ((s3
-1)->bbox
.xMax
+ (s3
-1)->pos
.x
) - (s2
->bbox
.xMin
+ s2
->pos
.x
);
1671 l1_new
= (e1
->bbox
.xMax
+ e1
->pos
.x
) - (s1
->bbox
.xMin
+ s1
->pos
.x
);
1672 l2_new
= ((s3
-1)->bbox
.xMax
+ (s3
-1)->pos
.x
) - (w
->bbox
.xMin
+ w
->pos
.x
);
1674 if (DIFF(l1_new
, l2_new
) < DIFF(l1
, l2
)) {
1681 if (i
== text_info
.length
)
1686 assert(text_info
.n_lines
>= 1);
1694 for (i
= 0; i
< text_info
.length
; ++i
) {
1695 cur
= text_info
.glyphs
+ i
;
1696 if (cur
->linebreak
) {
1697 int height
= text_info
.lines
[cur_line
- 1].desc
+ text_info
.lines
[cur_line
].asc
;
1699 pen_shift_x
= - cur
->pos
.x
;
1700 pen_shift_y
+= d6_to_int(height
+ double_to_d6(global_settings
->line_spacing
));
1701 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
);
1703 cur
->pos
.x
+= pen_shift_x
;
1704 cur
->pos
.y
+= pen_shift_y
;
1709 * \brief determine karaoke effects
1710 * Karaoke effects cannot be calculated during parse stage (get_next_char()),
1711 * so they are done in a separate step.
1712 * Parse stage: when karaoke style override is found, its parameters are stored in the next glyph's
1713 * (the first glyph of the karaoke word)'s effect_type and effect_timing.
1715 * 1. sets effect_type for all glyphs in the word (_karaoke_ word)
1716 * 2. sets effect_timing for all glyphs to x coordinate of the border line between the left and right karaoke parts
1717 * (left part is filled with PrimaryColour, right one - with SecondaryColour).
1719 static void process_karaoke_effects(void)
1721 glyph_info_t
*cur
, *cur2
;
1722 glyph_info_t
*s1
, *e1
; // start and end of the current word
1723 glyph_info_t
*s2
; // start of the next word
1725 int timing
; // current timing
1726 int tm_start
, tm_end
; // timings at start and end of the current word
1732 tm_current
= frame_context
.time
- render_context
.event
->Start
;
1735 for (i
= 0; i
<= text_info
.length
; ++i
) {
1736 cur
= text_info
.glyphs
+ i
;
1737 if ((i
== text_info
.length
) || (cur
->effect_type
!= EF_NONE
)) {
1742 tm_start
= timing
+ s1
->effect_skip_timing
;
1743 tm_end
= tm_start
+ s1
->effect_timing
;
1747 for (cur2
= s1
; cur2
<= e1
; ++cur2
) {
1748 x_start
= FFMIN(x_start
, cur2
->bbox
.xMin
+ cur2
->pos
.x
);
1749 x_end
= FFMAX(x_end
, cur2
->bbox
.xMax
+ cur2
->pos
.x
);
1752 dt
= (tm_current
- tm_start
);
1753 if ((s1
->effect_type
== EF_KARAOKE
) || (s1
->effect_type
== EF_KARAOKE_KO
)) {
1758 } else if (s1
->effect_type
== EF_KARAOKE_KF
) {
1759 dt
/= (tm_end
- tm_start
);
1760 x
= x_start
+ (x_end
- x_start
) * dt
;
1762 mp_msg(MSGT_ASS
, MSGL_ERR
, MSGTR_LIBASS_UnknownEffectType_InternalError
);
1766 for (cur2
= s1
; cur2
<= e1
; ++cur2
) {
1767 cur2
->effect_type
= s1
->effect_type
;
1768 cur2
->effect_timing
= x
- cur2
->pos
.x
;
1776 * \brief Calculate base point for positioning and rotation
1777 * \param bbox text bbox
1778 * \param alignment alignment
1779 * \param bx, by out: base point coordinates
1781 static void get_base_point(FT_BBox bbox
, int alignment
, int* bx
, int* by
)
1783 const int halign
= alignment
& 3;
1784 const int valign
= alignment
& 12;
1791 *bx
= (bbox
.xMax
+ bbox
.xMin
) / 2;
1803 *by
= (bbox
.yMax
+ bbox
.yMin
) / 2;
1812 * \brief Apply transformation to outline points of a glyph
1813 * Applies rotations given by frx, fry and frz and projects the points back
1814 * onto the screen plane.
1816 static void transform_3d_points(FT_Vector shift
, FT_Glyph glyph
, double frx
, double fry
, double frz
) {
1817 double sx
= sin(frx
);
1818 double sy
= sin(fry
);
1819 double sz
= sin(frz
);
1820 double cx
= cos(frx
);
1821 double cy
= cos(fry
);
1822 double cz
= cos(frz
);
1823 FT_Outline
*outline
= &((FT_OutlineGlyph
) glyph
)->outline
;
1824 FT_Vector
* p
= outline
->points
;
1825 double x
, y
, z
, xx
, yy
, zz
;
1828 for (i
=0; i
<outline
->n_points
; i
++) {
1829 x
= p
[i
].x
+ shift
.x
;
1830 y
= p
[i
].y
+ shift
.y
;
1834 yy
= -(x
*sz
- y
*cz
);
1845 zz
= FFMAX(zz
, -19000);
1847 x
= (xx
* 20000) / (zz
+ 20000);
1848 y
= (yy
* 20000) / (zz
+ 20000);
1849 p
[i
].x
= x
- shift
.x
+ 0.5;
1850 p
[i
].y
= y
- shift
.y
+ 0.5;
1855 * \brief Apply 3d transformation to several objects
1856 * \param shift FreeType vector
1857 * \param glyph FreeType glyph
1858 * \param glyph2 FreeType glyph
1859 * \param frx x-axis rotation angle
1860 * \param fry y-axis rotation angle
1861 * \param frz z-axis rotation angle
1862 * Rotates both glyphs by frx, fry and frz. Shift vector is added before rotation and subtracted after it.
1864 static void transform_3d(FT_Vector shift
, FT_Glyph
* glyph
, FT_Glyph
* glyph2
, double frx
, double fry
, double frz
)
1868 if (frx
!= 0. || fry
!= 0. || frz
!= 0.) {
1869 if (glyph
&& *glyph
)
1870 transform_3d_points(shift
, *glyph
, frx
, fry
, frz
);
1872 if (glyph2
&& *glyph2
)
1873 transform_3d_points(shift
, *glyph2
, frx
, fry
, frz
);
1879 * \brief Main ass rendering function, glues everything together
1880 * \param event event to render
1881 * \param event_images struct containing resulting images, will also be initialized
1882 * Process event, appending resulting ass_image_t's to images_root.
1884 static int ass_render_event(ass_event_t
* event
, event_images_t
* event_images
)
1894 int MarginL
, MarginR
, MarginV
;
1896 int alignment
, halign
, valign
;
1897 int device_x
= 0, device_y
= 0;
1899 if (event
->Style
>= frame_context
.track
->n_styles
) {
1900 mp_msg(MSGT_ASS
, MSGL_WARN
, MSGTR_LIBASS_NoStyleFound
);
1904 mp_msg(MSGT_ASS
, MSGL_WARN
, MSGTR_LIBASS_EmptyEvent
);
1908 init_render_context(event
);
1910 text_info
.length
= 0;
1918 // get next char, executing style override
1919 // this affects render_context
1921 code
= get_next_char(&p
);
1922 } while (code
&& render_context
.drawing_mode
); // skip everything in drawing mode
1924 // face could have been changed in get_next_char
1925 if (!render_context
.font
) {
1926 free_render_context();
1933 if (text_info
.length
>= MAX_GLYPHS
) {
1934 mp_msg(MSGT_ASS
, MSGL_WARN
, MSGTR_LIBASS_MAX_GLYPHS_Reached
,
1935 (int)(event
- frame_context
.track
->events
), event
->Start
, event
->Duration
, event
->Text
);
1939 if ( previous
&& code
) {
1941 delta
= ass_font_get_kerning(render_context
.font
, previous
, code
);
1942 pen
.x
+= delta
.x
* render_context
.scale_x
;
1943 pen
.y
+= delta
.y
* render_context
.scale_y
;
1946 shift
.x
= pen
.x
& SUBPIXEL_MASK
;
1947 shift
.y
= pen
.y
& SUBPIXEL_MASK
;
1949 if (render_context
.evt_type
== EVENT_POSITIONED
) {
1950 shift
.x
+= double_to_d6(x2scr_pos(render_context
.pos_x
)) & SUBPIXEL_MASK
;
1951 shift
.y
-= double_to_d6(y2scr_pos(render_context
.pos_y
)) & SUBPIXEL_MASK
;
1954 ass_font_set_transform(render_context
.font
,
1955 render_context
.scale_x
* frame_context
.font_scale_x
,
1956 render_context
.scale_y
,
1959 get_outline_glyph(code
, text_info
.glyphs
+ text_info
.length
, &shift
);
1961 text_info
.glyphs
[text_info
.length
].pos
.x
= pen
.x
>> 6;
1962 text_info
.glyphs
[text_info
.length
].pos
.y
= pen
.y
>> 6;
1964 pen
.x
+= text_info
.glyphs
[text_info
.length
].advance
.x
;
1965 pen
.x
+= double_to_d6(render_context
.hspacing
);
1966 pen
.y
+= text_info
.glyphs
[text_info
.length
].advance
.y
;
1970 text_info
.glyphs
[text_info
.length
].symbol
= code
;
1971 text_info
.glyphs
[text_info
.length
].linebreak
= 0;
1972 for (i
= 0; i
< 4; ++i
) {
1973 uint32_t clr
= render_context
.c
[i
];
1974 change_alpha(&clr
, mult_alpha(_a(clr
), render_context
.fade
), 1.);
1975 text_info
.glyphs
[text_info
.length
].c
[i
] = clr
;
1977 text_info
.glyphs
[text_info
.length
].effect_type
= render_context
.effect_type
;
1978 text_info
.glyphs
[text_info
.length
].effect_timing
= render_context
.effect_timing
;
1979 text_info
.glyphs
[text_info
.length
].effect_skip_timing
= render_context
.effect_skip_timing
;
1980 text_info
.glyphs
[text_info
.length
].be
= render_context
.be
;
1981 text_info
.glyphs
[text_info
.length
].blur
= render_context
.blur
;
1982 text_info
.glyphs
[text_info
.length
].shadow
= render_context
.shadow
;
1983 text_info
.glyphs
[text_info
.length
].frx
= render_context
.frx
;
1984 text_info
.glyphs
[text_info
.length
].fry
= render_context
.fry
;
1985 text_info
.glyphs
[text_info
.length
].frz
= render_context
.frz
;
1986 ass_font_get_asc_desc(render_context
.font
, code
,
1987 &text_info
.glyphs
[text_info
.length
].asc
,
1988 &text_info
.glyphs
[text_info
.length
].desc
);
1989 text_info
.glyphs
[text_info
.length
].asc
*= render_context
.scale_y
;
1990 text_info
.glyphs
[text_info
.length
].desc
*= render_context
.scale_y
;
1992 // fill bitmap_hash_key
1993 text_info
.glyphs
[text_info
.length
].hash_key
.font
= render_context
.font
;
1994 text_info
.glyphs
[text_info
.length
].hash_key
.size
= render_context
.font_size
;
1995 text_info
.glyphs
[text_info
.length
].hash_key
.outline
= render_context
.border
* 0xFFFF;
1996 text_info
.glyphs
[text_info
.length
].hash_key
.scale_x
= render_context
.scale_x
* 0xFFFF;
1997 text_info
.glyphs
[text_info
.length
].hash_key
.scale_y
= render_context
.scale_y
* 0xFFFF;
1998 text_info
.glyphs
[text_info
.length
].hash_key
.frx
= render_context
.frx
* 0xFFFF;
1999 text_info
.glyphs
[text_info
.length
].hash_key
.fry
= render_context
.fry
* 0xFFFF;
2000 text_info
.glyphs
[text_info
.length
].hash_key
.frz
= render_context
.frz
* 0xFFFF;
2001 text_info
.glyphs
[text_info
.length
].hash_key
.bold
= render_context
.bold
;
2002 text_info
.glyphs
[text_info
.length
].hash_key
.italic
= render_context
.italic
;
2003 text_info
.glyphs
[text_info
.length
].hash_key
.ch
= code
;
2004 text_info
.glyphs
[text_info
.length
].hash_key
.advance
= shift
;
2005 text_info
.glyphs
[text_info
.length
].hash_key
.be
= render_context
.be
;
2006 text_info
.glyphs
[text_info
.length
].hash_key
.blur
= render_context
.blur
;
2010 render_context
.effect_type
= EF_NONE
;
2011 render_context
.effect_timing
= 0;
2012 render_context
.effect_skip_timing
= 0;
2015 if (text_info
.length
== 0) {
2016 // no valid symbols in the event; this can be smth like {comment}
2017 free_render_context();
2021 // depends on glyph x coordinates being monotonous, so it should be done before line wrap
2022 process_karaoke_effects();
2025 alignment
= render_context
.alignment
;
2026 halign
= alignment
& 3;
2027 valign
= alignment
& 12;
2029 MarginL
= (event
->MarginL
) ? event
->MarginL
: render_context
.style
->MarginL
;
2030 MarginR
= (event
->MarginR
) ? event
->MarginR
: render_context
.style
->MarginR
;
2031 MarginV
= (event
->MarginV
) ? event
->MarginV
: render_context
.style
->MarginV
;
2033 if (render_context
.evt_type
!= EVENT_HSCROLL
) {
2036 // calculate max length of a line
2037 max_text_width
= x2scr(frame_context
.track
->PlayResX
- MarginR
) - x2scr(MarginL
);
2039 // rearrange text in several lines
2040 wrap_lines_smart(max_text_width
);
2044 for (i
= 1; i
< text_info
.length
+ 1; ++i
) { // (text_info.length + 1) is the end of the last line
2045 if ((i
== text_info
.length
) || text_info
.glyphs
[i
].linebreak
) {
2046 int width
, shift
= 0;
2047 glyph_info_t
* first_glyph
= text_info
.glyphs
+ last_break
+ 1;
2048 glyph_info_t
* last_glyph
= text_info
.glyphs
+ i
- 1;
2050 while ((last_glyph
> first_glyph
) && ((last_glyph
->symbol
== '\n') || (last_glyph
->symbol
== 0)))
2053 width
= last_glyph
->pos
.x
+ d6_to_int(last_glyph
->advance
.x
) - first_glyph
->pos
.x
;
2054 if (halign
== HALIGN_LEFT
) { // left aligned, no action
2056 } else if (halign
== HALIGN_RIGHT
) { // right aligned
2057 shift
= max_text_width
- width
;
2058 } else if (halign
== HALIGN_CENTER
) { // centered
2059 shift
= (max_text_width
- width
) / 2;
2061 for (j
= last_break
+ 1; j
< i
; ++j
) {
2062 text_info
.glyphs
[j
].pos
.x
+= shift
;
2067 } else { // render_context.evt_type == EVENT_HSCROLL
2071 // determing text bounding box
2072 compute_string_bbox(&text_info
, &bbox
);
2074 // determine device coordinates for text
2076 // x coordinate for everything except positioned events
2077 if (render_context
.evt_type
== EVENT_NORMAL
||
2078 render_context
.evt_type
== EVENT_VSCROLL
) {
2079 device_x
= x2scr(MarginL
);
2080 } else if (render_context
.evt_type
== EVENT_HSCROLL
) {
2081 if (render_context
.scroll_direction
== SCROLL_RL
)
2082 device_x
= x2scr(frame_context
.track
->PlayResX
- render_context
.scroll_shift
);
2083 else if (render_context
.scroll_direction
== SCROLL_LR
)
2084 device_x
= x2scr(render_context
.scroll_shift
) - (bbox
.xMax
- bbox
.xMin
);
2087 // y coordinate for everything except positioned events
2088 if (render_context
.evt_type
== EVENT_NORMAL
||
2089 render_context
.evt_type
== EVENT_HSCROLL
) {
2090 if (valign
== VALIGN_TOP
) { // toptitle
2091 device_y
= y2scr_top(MarginV
) + d6_to_int(text_info
.lines
[0].asc
);
2092 } else if (valign
== VALIGN_CENTER
) { // midtitle
2093 int scr_y
= y2scr(frame_context
.track
->PlayResY
/ 2);
2094 device_y
= scr_y
- (bbox
.yMax
- bbox
.yMin
) / 2;
2095 } else { // subtitle
2097 if (valign
!= VALIGN_SUB
)
2098 mp_msg(MSGT_ASS
, MSGL_V
, "Invalid valign, supposing 0 (subtitle)\n");
2099 scr_y
= y2scr_sub(frame_context
.track
->PlayResY
- MarginV
);
2101 device_y
-= d6_to_int(text_info
.height
);
2102 device_y
+= d6_to_int(text_info
.lines
[0].asc
);
2104 } else if (render_context
.evt_type
== EVENT_VSCROLL
) {
2105 if (render_context
.scroll_direction
== SCROLL_TB
)
2106 device_y
= y2scr(render_context
.clip_y0
+ render_context
.scroll_shift
) - (bbox
.yMax
- bbox
.yMin
);
2107 else if (render_context
.scroll_direction
== SCROLL_BT
)
2108 device_y
= y2scr(render_context
.clip_y1
- render_context
.scroll_shift
);
2111 // positioned events are totally different
2112 if (render_context
.evt_type
== EVENT_POSITIONED
) {
2115 mp_msg(MSGT_ASS
, MSGL_DBG2
, "positioned event at %f, %f\n", render_context
.pos_x
, render_context
.pos_y
);
2116 get_base_point(bbox
, alignment
, &base_x
, &base_y
);
2117 device_x
= x2scr_pos(render_context
.pos_x
) - base_x
;
2118 device_y
= y2scr_pos(render_context
.pos_y
) - base_y
;
2121 // fix clip coordinates (they depend on alignment)
2122 if (render_context
.evt_type
== EVENT_NORMAL
||
2123 render_context
.evt_type
== EVENT_HSCROLL
||
2124 render_context
.evt_type
== EVENT_VSCROLL
) {
2125 render_context
.clip_x0
= x2scr(render_context
.clip_x0
);
2126 render_context
.clip_x1
= x2scr(render_context
.clip_x1
);
2127 if (valign
== VALIGN_TOP
) {
2128 render_context
.clip_y0
= y2scr_top(render_context
.clip_y0
);
2129 render_context
.clip_y1
= y2scr_top(render_context
.clip_y1
);
2130 } else if (valign
== VALIGN_CENTER
) {
2131 render_context
.clip_y0
= y2scr(render_context
.clip_y0
);
2132 render_context
.clip_y1
= y2scr(render_context
.clip_y1
);
2133 } else if (valign
== VALIGN_SUB
) {
2134 render_context
.clip_y0
= y2scr_sub(render_context
.clip_y0
);
2135 render_context
.clip_y1
= y2scr_sub(render_context
.clip_y1
);
2137 } else if (render_context
.evt_type
== EVENT_POSITIONED
) {
2138 render_context
.clip_x0
= x2scr_pos(render_context
.clip_x0
);
2139 render_context
.clip_x1
= x2scr_pos(render_context
.clip_x1
);
2140 render_context
.clip_y0
= y2scr_pos(render_context
.clip_y0
);
2141 render_context
.clip_y1
= y2scr_pos(render_context
.clip_y1
);
2144 // calculate rotation parameters
2148 if (render_context
.have_origin
) {
2149 center
.x
= x2scr(render_context
.org_x
);
2150 center
.y
= y2scr(render_context
.org_y
);
2153 get_base_point(bbox
, alignment
, &bx
, &by
);
2154 center
.x
= device_x
+ bx
;
2155 center
.y
= device_y
+ by
;
2158 for (i
= 0; i
< text_info
.length
; ++i
) {
2159 glyph_info_t
* info
= text_info
.glyphs
+ i
;
2161 if (info
->hash_key
.frx
|| info
->hash_key
.fry
|| info
->hash_key
.frz
) {
2162 info
->hash_key
.shift_x
= info
->pos
.x
+ device_x
- center
.x
;
2163 info
->hash_key
.shift_y
= - (info
->pos
.y
+ device_y
- center
.y
);
2165 info
->hash_key
.shift_x
= 0;
2166 info
->hash_key
.shift_y
= 0;
2171 // convert glyphs to bitmaps
2172 for (i
= 0; i
< text_info
.length
; ++i
)
2173 get_bitmap_glyph(text_info
.glyphs
+ i
);
2175 memset(event_images
, 0, sizeof(*event_images
));
2176 event_images
->top
= device_y
- d6_to_int(text_info
.lines
[0].asc
);
2177 event_images
->height
= d6_to_int(text_info
.height
);
2178 event_images
->detect_collisions
= render_context
.detect_collisions
;
2179 event_images
->shift_direction
= (valign
== VALIGN_TOP
) ? 1 : -1;
2180 event_images
->event
= event
;
2181 event_images
->imgs
= render_text(&text_info
, device_x
, device_y
);
2183 free_render_context();
2189 * \brief deallocate image list
2190 * \param img list pointer
2192 static void ass_free_images(ass_image_t
* img
)
2195 ass_image_t
* next
= img
->next
;
2201 static void ass_reconfigure(ass_renderer_t
* priv
)
2203 priv
->render_id
= ++last_render_id
;
2204 ass_glyph_cache_reset();
2205 ass_bitmap_cache_reset();
2206 ass_composite_cache_reset();
2207 ass_free_images(priv
->prev_images_root
);
2208 priv
->prev_images_root
= 0;
2211 void ass_set_frame_size(ass_renderer_t
* priv
, int w
, int h
)
2213 if (priv
->settings
.frame_width
!= w
|| priv
->settings
.frame_height
!= h
) {
2214 priv
->settings
.frame_width
= w
;
2215 priv
->settings
.frame_height
= h
;
2216 if (priv
->settings
.aspect
== 0.)
2217 priv
->settings
.aspect
= ((double)w
) / h
;
2218 ass_reconfigure(priv
);
2222 void ass_set_margins(ass_renderer_t
* priv
, int t
, int b
, int l
, int r
)
2224 if (priv
->settings
.left_margin
!= l
||
2225 priv
->settings
.right_margin
!= r
||
2226 priv
->settings
.top_margin
!= t
||
2227 priv
->settings
.bottom_margin
!= b
) {
2228 priv
->settings
.left_margin
= l
;
2229 priv
->settings
.right_margin
= r
;
2230 priv
->settings
.top_margin
= t
;
2231 priv
->settings
.bottom_margin
= b
;
2232 ass_reconfigure(priv
);
2236 void ass_set_use_margins(ass_renderer_t
* priv
, int use
)
2238 priv
->settings
.use_margins
= use
;
2241 void ass_set_aspect_ratio(ass_renderer_t
* priv
, double ar
)
2243 if (priv
->settings
.aspect
!= ar
) {
2244 priv
->settings
.aspect
= ar
;
2245 ass_reconfigure(priv
);
2249 void ass_set_font_scale(ass_renderer_t
* priv
, double font_scale
)
2251 if (priv
->settings
.font_size_coeff
!= font_scale
) {
2252 priv
->settings
.font_size_coeff
= font_scale
;
2253 ass_reconfigure(priv
);
2257 void ass_set_hinting(ass_renderer_t
* priv
, ass_hinting_t ht
)
2259 if (priv
->settings
.hinting
!= ht
) {
2260 priv
->settings
.hinting
= ht
;
2261 ass_reconfigure(priv
);
2265 void ass_set_line_spacing(ass_renderer_t
* priv
, double line_spacing
)
2267 priv
->settings
.line_spacing
= line_spacing
;
2270 static int ass_set_fonts_(ass_renderer_t
* priv
, const char* default_font
, const char* default_family
, int fc
)
2272 if (priv
->settings
.default_font
)
2273 free(priv
->settings
.default_font
);
2274 if (priv
->settings
.default_family
)
2275 free(priv
->settings
.default_family
);
2277 priv
->settings
.default_font
= default_font
? strdup(default_font
) : 0;
2278 priv
->settings
.default_family
= default_family
? strdup(default_family
) : 0;
2280 if (priv
->fontconfig_priv
)
2281 fontconfig_done(priv
->fontconfig_priv
);
2282 priv
->fontconfig_priv
= fontconfig_init(priv
->library
, priv
->ftlibrary
, default_family
, default_font
, fc
);
2284 return !!priv
->fontconfig_priv
;
2287 int ass_set_fonts(ass_renderer_t
* priv
, const char* default_font
, const char* default_family
)
2289 return ass_set_fonts_(priv
, default_font
, default_family
, 1);
2292 int ass_set_fonts_nofc(ass_renderer_t
* priv
, const char* default_font
, const char* default_family
)
2294 return ass_set_fonts_(priv
, default_font
, default_family
, 0);
2298 * \brief Start a new frame
2300 static int ass_start_frame(ass_renderer_t
*priv
, ass_track_t
* track
, long long now
)
2302 ass_renderer
= priv
;
2303 global_settings
= &priv
->settings
;
2305 if (!priv
->settings
.frame_width
&& !priv
->settings
.frame_height
)
2306 return 1; // library not initialized
2308 if (track
->n_events
== 0)
2309 return 1; // nothing to do
2311 frame_context
.ass_priv
= priv
;
2312 frame_context
.width
= global_settings
->frame_width
;
2313 frame_context
.height
= global_settings
->frame_height
;
2314 frame_context
.orig_width
= global_settings
->frame_width
- global_settings
->left_margin
- global_settings
->right_margin
;
2315 frame_context
.orig_height
= global_settings
->frame_height
- global_settings
->top_margin
- global_settings
->bottom_margin
;
2316 frame_context
.orig_width_nocrop
= global_settings
->frame_width
-
2317 FFMAX(global_settings
->left_margin
, 0) -
2318 FFMAX(global_settings
->right_margin
, 0);
2319 frame_context
.orig_height_nocrop
= global_settings
->frame_height
-
2320 FFMAX(global_settings
->top_margin
, 0) -
2321 FFMAX(global_settings
->bottom_margin
, 0);
2322 frame_context
.track
= track
;
2323 frame_context
.time
= now
;
2325 ass_lazy_track_init();
2327 frame_context
.font_scale
= global_settings
->font_size_coeff
*
2328 frame_context
.orig_height
/ frame_context
.track
->PlayResY
;
2329 if (frame_context
.track
->ScaledBorderAndShadow
)
2330 frame_context
.border_scale
= ((double)frame_context
.orig_height
) / frame_context
.track
->PlayResY
;
2332 frame_context
.border_scale
= 1.;
2334 frame_context
.font_scale_x
= 1.;
2336 priv
->prev_images_root
= priv
->images_root
;
2337 priv
->images_root
= 0;
2342 static int cmp_event_layer(const void* p1
, const void* p2
)
2344 ass_event_t
* e1
= ((event_images_t
*)p1
)->event
;
2345 ass_event_t
* e2
= ((event_images_t
*)p2
)->event
;
2346 if (e1
->Layer
< e2
->Layer
)
2348 if (e1
->Layer
> e2
->Layer
)
2350 if (e1
->ReadOrder
< e2
->ReadOrder
)
2352 if (e1
->ReadOrder
> e2
->ReadOrder
)
2357 #define MAX_EVENTS 100
2359 static render_priv_t
* get_render_priv(ass_event_t
* event
)
2361 if (!event
->render_priv
)
2362 event
->render_priv
= calloc(1, sizeof(render_priv_t
));
2363 // FIXME: check render_id
2364 if (ass_renderer
->render_id
!= event
->render_priv
->render_id
) {
2365 memset(event
->render_priv
, 0, sizeof(render_priv_t
));
2366 event
->render_priv
->render_id
= ass_renderer
->render_id
;
2368 return event
->render_priv
;
2371 typedef struct segment_s
{
2372 int a
, b
; // top and height
2375 static int overlap(segment_t
* s1
, segment_t
* s2
)
2377 if (s1
->a
>= s2
->b
|| s2
->a
>= s1
->b
)
2382 static int cmp_segment(const void* p1
, const void* p2
)
2384 return ((segment_t
*)p1
)->a
- ((segment_t
*)p2
)->a
;
2387 static void shift_event(event_images_t
* ei
, int shift
)
2389 ass_image_t
* cur
= ei
->imgs
;
2391 cur
->dst_y
+= shift
;
2392 // clip top and bottom
2393 if (cur
->dst_y
< 0) {
2394 int clip
= - cur
->dst_y
;
2396 cur
->bitmap
+= clip
* cur
->stride
;
2399 if (cur
->dst_y
+ cur
->h
>= frame_context
.height
) {
2400 int clip
= cur
->dst_y
+ cur
->h
- frame_context
.height
;
2412 // dir: 1 - move down
2414 static int fit_segment(segment_t
* s
, segment_t
* fixed
, int* cnt
, int dir
)
2419 if (dir
== 1) // move down
2420 for (i
= 0; i
< *cnt
; ++i
) {
2421 if (s
->b
+ shift
<= fixed
[i
].a
|| s
->a
+ shift
>= fixed
[i
].b
)
2423 shift
= fixed
[i
].b
- s
->a
;
2425 else // dir == -1, move up
2426 for (i
= *cnt
-1; i
>= 0; --i
) {
2427 if (s
->b
+ shift
<= fixed
[i
].a
|| s
->a
+ shift
>= fixed
[i
].b
)
2429 shift
= fixed
[i
].a
- s
->b
;
2432 fixed
[*cnt
].a
= s
->a
+ shift
;
2433 fixed
[*cnt
].b
= s
->b
+ shift
;
2435 qsort(fixed
, *cnt
, sizeof(segment_t
), cmp_segment
);
2440 static void fix_collisions(event_images_t
* imgs
, int cnt
)
2442 segment_t used
[MAX_EVENTS
];
2446 // fill used[] with fixed events
2447 for (i
= 0; i
< cnt
; ++i
) {
2448 render_priv_t
* priv
;
2449 if (!imgs
[i
].detect_collisions
) continue;
2450 priv
= get_render_priv(imgs
[i
].event
);
2451 if (priv
->height
> 0) { // it's a fixed event
2454 s
.b
= priv
->top
+ priv
->height
;
2455 if (priv
->height
!= imgs
[i
].height
) { // no, it's not
2456 mp_msg(MSGT_ASS
, MSGL_WARN
, MSGTR_LIBASS_EventHeightHasChanged
);
2460 for (j
= 0; j
< cnt_used
; ++j
)
2461 if (overlap(&s
, used
+ j
)) { // no, it's not
2465 if (priv
->height
> 0) { // still a fixed event
2466 used
[cnt_used
].a
= priv
->top
;
2467 used
[cnt_used
].b
= priv
->top
+ priv
->height
;
2469 shift_event(imgs
+ i
, priv
->top
- imgs
[i
].top
);
2473 qsort(used
, cnt_used
, sizeof(segment_t
), cmp_segment
);
2475 // try to fit other events in free spaces
2476 for (i
= 0; i
< cnt
; ++i
) {
2477 render_priv_t
* priv
;
2478 if (!imgs
[i
].detect_collisions
) continue;
2479 priv
= get_render_priv(imgs
[i
].event
);
2480 if (priv
->height
== 0) { // not a fixed event
2484 s
.b
= imgs
[i
].top
+ imgs
[i
].height
;
2485 shift
= fit_segment(&s
, used
, &cnt_used
, imgs
[i
].shift_direction
);
2486 if (shift
) shift_event(imgs
+ i
, shift
);
2488 priv
->top
= imgs
[i
].top
;
2489 priv
->height
= imgs
[i
].height
;
2496 * \brief compare two images
2497 * \param i1 first image
2498 * \param i2 second image
2499 * \return 0 if identical, 1 if different positions, 2 if different content
2501 static int ass_image_compare(ass_image_t
*i1
, ass_image_t
*i2
)
2503 if (i1
->w
!= i2
->w
) return 2;
2504 if (i1
->h
!= i2
->h
) return 2;
2505 if (i1
->stride
!= i2
->stride
) return 2;
2506 if (i1
->color
!= i2
->color
) return 2;
2507 if (i1
->bitmap
!= i2
->bitmap
)
2509 if (i1
->dst_x
!= i2
->dst_x
) return 1;
2510 if (i1
->dst_y
!= i2
->dst_y
) return 1;
2515 * \brief compare current and previous image list
2516 * \param priv library handle
2517 * \return 0 if identical, 1 if different positions, 2 if different content
2519 static int ass_detect_change(ass_renderer_t
*priv
)
2521 ass_image_t
* img
, *img2
;
2524 img
= priv
->prev_images_root
;
2525 img2
= priv
->images_root
;
2527 while (img
&& diff
< 2) {
2528 ass_image_t
* next
, *next2
;
2531 int d
= ass_image_compare(img
, img2
);
2532 if (d
> diff
) diff
= d
;
2535 // previous list is shorter
2543 // is the previous list longer?
2551 * \brief render a frame
2552 * \param priv library handle
2553 * \param track track
2554 * \param now current video timestamp (ms)
2555 * \param detect_change a value describing how the new images differ from the previous ones will be written here:
2556 * 0 if identical, 1 if different positions, 2 if different content.
2557 * Can be NULL, in that case no detection is performed.
2559 ass_image_t
* ass_render_frame(ass_renderer_t
*priv
, ass_track_t
* track
, long long now
, int* detect_change
)
2562 event_images_t
* last
;
2566 rc
= ass_start_frame(priv
, track
, now
);
2570 // render events separately
2572 for (i
= 0; i
< track
->n_events
; ++i
) {
2573 ass_event_t
* event
= track
->events
+ i
;
2574 if ( (event
->Start
<= now
) && (now
< (event
->Start
+ event
->Duration
)) ) {
2575 if (cnt
>= priv
->eimg_size
) {
2576 priv
->eimg_size
+= 100;
2577 priv
->eimg
= realloc(priv
->eimg
, priv
->eimg_size
* sizeof(event_images_t
));
2579 rc
= ass_render_event(event
, priv
->eimg
+ cnt
);
2585 qsort(priv
->eimg
, cnt
, sizeof(event_images_t
), cmp_event_layer
);
2587 // call fix_collisions for each group of events with the same layer
2589 for (i
= 1; i
< cnt
; ++i
)
2590 if (last
->event
->Layer
!= priv
->eimg
[i
].event
->Layer
) {
2591 fix_collisions(last
, priv
->eimg
+ i
- last
);
2592 last
= priv
->eimg
+ i
;
2595 fix_collisions(last
, priv
->eimg
+ cnt
- last
);
2598 tail
= &ass_renderer
->images_root
;
2599 for (i
= 0; i
< cnt
; ++i
) {
2600 ass_image_t
* cur
= priv
->eimg
[i
].imgs
;
2609 *detect_change
= ass_detect_change(priv
);
2611 // free the previous image list
2612 ass_free_images(priv
->prev_images_root
);
2613 priv
->prev_images_root
= 0;
2615 return ass_renderer
->images_root
;