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
47 #define BLUR_MAX_RADIUS 50.0
49 static int last_render_id
= 0;
51 typedef struct ass_settings_s
{
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.
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
;
70 typedef struct event_images_s
{
73 int detect_collisions
;
78 struct ass_renderer_s
{
79 ass_library_t
* library
;
81 fc_instance_t
* fontconfig_priv
;
82 ass_settings_t settings
;
84 ass_synth_priv_t
* synth_priv
;
85 ass_synth_priv_t
* synth_priv_blur
;
87 ass_image_t
* images_root
; // rendering result is stored here
88 ass_image_t
* prev_images_root
;
90 event_images_t
* eimg
; // temporary buffer for sorting rendered events
91 int eimg_size
; // allocated buffer size
94 typedef enum {EF_NONE
= 0, EF_KARAOKE
, EF_KARAOKE_KF
, EF_KARAOKE_KO
} effect_t
;
97 // glyph_info_t and text_info_t are used for text centering and word-wrapping operations
98 typedef struct glyph_info_s
{
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
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
117 int be
; // blur edges
118 double blur
; // gaussian blur
120 double frx
, fry
, frz
; // rotation
122 bitmap_hash_key_t hash_key
;
125 typedef struct line_info_s
{
129 typedef struct text_info_s
{
130 glyph_info_t
* glyphs
;
132 line_info_t lines
[MAX_LINES
];
139 // Values like current font face, color, screen position, clipping and so on are stored here.
140 typedef struct render_context_s
{
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
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
169 int drawing_mode
; // not implemented; when != 0 text is discarded, except for style override tags
171 effect_t effect_type
;
173 int effect_skip_timing
;
175 enum { SCROLL_LR
, // left-to-right
177 SCROLL_TB
, // top-to-bottom
179 } scroll_direction
; // for EVENT_HSCROLL, EVENT_VSCROLL
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)
198 long long time
; // frame's timestamp, ms
200 double font_scale_x
; // x scale applied to all glyphs to preserve text aspect ratio
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
;
210 struct render_priv_s
{
215 static void ass_lazy_track_init(void)
217 ass_track_t
* track
= frame_context
.track
;
218 if (track
->PlayResX
&& track
->PlayResY
)
220 if (!track
->PlayResX
&& !track
->PlayResY
) {
221 mp_msg(MSGT_ASS
, MSGL_WARN
, MSGTR_LIBASS_NeitherPlayResXNorPlayResYDefined
);
222 track
->PlayResX
= 384;
223 track
->PlayResY
= 288;
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
);
237 ass_renderer_t
* ass_renderer_init(ass_library_t
* library
)
241 ass_renderer_t
* priv
= 0;
242 int vmajor
, vminor
, vpatch
;
244 memset(&render_context
, 0, sizeof(render_context
));
245 memset(&frame_context
, 0, sizeof(frame_context
));
246 memset(&text_info
, 0, sizeof(text_info
));
248 error
= FT_Init_FreeType( &ft
);
250 mp_msg(MSGT_ASS
, MSGL_FATAL
, MSGTR_LIBASS_FT_Init_FreeTypeFailed
);
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
);
260 priv
= calloc(1, sizeof(ass_renderer_t
));
262 FT_Done_FreeType(ft
);
266 priv
->synth_priv
= ass_synth_init(BE_RADIUS
);
267 priv
->synth_priv_blur
= ass_synth_init(BLUR_MAX_RADIUS
);
269 priv
->library
= library
;
270 priv
->ftlibrary
= ft
;
271 // images_root and related stuff is zero-filled in calloc
273 ass_font_cache_init();
274 ass_bitmap_cache_init();
275 ass_glyph_cache_init();
277 text_info
.glyphs
= calloc(MAX_GLYPHS
, sizeof(glyph_info_t
));
280 if (priv
) mp_msg(MSGT_ASS
, MSGL_INFO
, MSGTR_LIBASS_Init
);
281 else mp_msg(MSGT_ASS
, MSGL_ERR
, MSGTR_LIBASS_InitFailed
);
286 void ass_renderer_done(ass_renderer_t
* priv
)
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;
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
);
304 * \brief Create a new ass_image_t
305 * Parameters are the same as ass_image_t fields.
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
)
309 ass_image_t
* img
= calloc(1, sizeof(ass_image_t
));
313 img
->stride
= stride
;
314 img
->bitmap
= bitmap
;
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.
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
)
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
;
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
;
358 tmp
= dst_x
- clip_x0
;
360 mp_msg(MSGT_ASS
, MSGL_DBG2
, "clip left\n");
363 tmp
= dst_y
- clip_y0
;
365 mp_msg(MSGT_ASS
, MSGL_DBG2
, "clip top\n");
368 tmp
= clip_x1
- dst_x
- bm
->w
;
370 mp_msg(MSGT_ASS
, MSGL_DBG2
, "clip right\n");
373 tmp
= clip_y1
- dst_y
- bm
->h
;
375 mp_msg(MSGT_ASS
, MSGL_DBG2
, "clip bottom\n");
379 if ((b_y0
>= b_y1
) || (b_x0
>= b_x1
))
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
);
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
);
402 * \brief Convert text_info_t struct to ass_image_t list
403 * Splits glyphs in halves when needed (for \kf karaoke).
405 static ass_image_t
* render_text(text_info_t
* text_info
, int dst_x
, int dst_y
)
411 ass_image_t
** tail
= &head
;
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))
418 pen_x
= dst_x
+ info
->pos
.x
+ info
->shadow
;
419 pen_y
= dst_y
+ info
->pos
.y
+ info
->shadow
;
422 tail
= render_glyph(bm
, pen_x
, pen_y
, info
->c
[3], 0, 1000000, tail
);
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
)
430 pen_x
= dst_x
+ info
->pos
.x
;
431 pen_y
= dst_y
+ info
->pos
.y
;
434 if ((info
->effect_type
== EF_KARAOKE_KO
) && (info
->effect_timing
<= info
->bbox
.xMax
)) {
437 tail
= render_glyph(bm
, pen_x
, pen_y
, info
->c
[2], 0, 1000000, tail
);
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
)
444 pen_x
= dst_x
+ info
->pos
.x
;
445 pen_y
= dst_y
+ info
->pos
.y
;
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
);
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
);
456 tail
= render_glyph(bm
, pen_x
, pen_y
, info
->c
[0], 0, 1000000, tail
);
464 * \brief Mapping between script and screen coordinates
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);
471 * \brief Mapping between script and screen coordinates
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);
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
;
482 return y
* frame_context
.orig_height_nocrop
/ frame_context
.track
->PlayResY
+
483 FFMAX(global_settings
->top_margin
, 0);
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);
492 return y
* frame_context
.orig_height_nocrop
/ frame_context
.track
->PlayResY
+
493 FFMAX(global_settings
->top_margin
, 0);
496 static void compute_string_bbox( text_info_t
* info
, FT_BBox
*abbox
) {
500 if (text_info
.length
> 0) {
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
;
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
);
513 bbox
.xMin
= bbox
.xMax
= bbox
.yMin
= bbox
.yMax
= 0;
515 /* return string bbox */
521 * \brief Check if starting part of (*p) matches sample. If true, shift p to the first symbol after the matching part.
523 static inline int mystrcmp(char** p
, const char* sample
) {
524 int len
= strlen(sample
);
525 if (strncmp(*p
, sample
, len
) == 0) {
532 static void change_font_size(double sz
)
534 double size
= sz
* frame_context
.font_scale
;
538 else if (size
> frame_context
.height
* 2)
539 size
= frame_context
.height
* 2;
541 ass_font_set_size(render_context
.font
, size
);
543 render_context
.font_size
= sz
;
547 * \brief Change current font, using setting from render_context.
549 static void update_font(void)
552 ass_renderer_t
* priv
= frame_context
.ass_priv
;
553 ass_font_desc_t desc
;
554 desc
.family
= strdup(render_context
.family
);
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
562 val
= render_context
.italic
;
563 if (val
== 0) val
= 0; // normal
564 else if (val
== 1) val
= 110; //italic
567 render_context
.font
= ass_font_new(priv
->library
, priv
->ftlibrary
, priv
->fontconfig_priv
, &desc
);
570 if (render_context
.font
)
571 change_font_size(render_context
.font_size
);
575 * \brief Change border width
576 * negative value resets border to style value
578 static void change_border(double border
)
581 if (!render_context
.font
) return;
584 if (render_context
.style
->BorderStyle
== 1)
585 border
= render_context
.style
->Outline
;
589 render_context
.border
= border
;
591 b
= 64 * border
* frame_context
.border_scale
;
593 if (!render_context
.stroker
) {
595 #if (FREETYPE_MAJOR > 2) || ((FREETYPE_MAJOR == 2) && (FREETYPE_MINOR > 1))
596 error
= FT_Stroker_New( ass_renderer
->ftlibrary
, &render_context
.stroker
);
598 error
= FT_Stroker_New( render_context
.font
->faces
[0]->memory
, &render_context
.stroker
);
601 mp_msg(MSGT_ASS
, MSGL_V
, "failed to get stroker\n");
602 render_context
.stroker
= 0;
605 if (render_context
.stroker
)
606 FT_Stroker_Set( render_context
.stroker
, b
,
607 FT_STROKER_LINECAP_ROUND
,
608 FT_STROKER_LINEJOIN_ROUND
,
611 FT_Stroker_Done(render_context
.stroker
);
612 render_context
.stroker
= 0;
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)
622 * \brief Calculate a weighted average of two colors
623 * calculates c1*(1-a) + c2*a, but separately for each component except alpha
625 static void change_color(uint32_t* var
, uint32_t new, double pwr
)
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) +
633 // like change_color, but for alpha component only
634 static void change_alpha(uint32_t* var
, uint32_t new, double pwr
)
636 *var
= (_r(*var
) << 24) + (_g(*var
) << 16) + (_b(*var
) << 8) + (_a(*var
) * (1 - pwr
) + _a(new) * pwr
);
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.
646 static uint32_t mult_alpha(uint32_t a
, uint32_t b
)
648 return 0xFF - (0xFF - a
) * (0xFF - b
) / 0xFF;
652 * \brief Calculate alpha value by piecewise linear function
653 * Used for \fad, \fade implementation.
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
)
663 } else if (now
>= t4
) {
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
678 static void reset_render_context(void);
681 * \brief Parse style override tag.
682 * \param p string to parse
683 * \param pwr multiplier for some tag effects (comes from \t tags)
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; }
691 if ((*p
== '}') || (*p
== 0))
694 // New tags introduced in vsfilter 2.39
695 if (mystrcmp(&p
, "xbord")) {
697 if (mystrtod(&p
, &val
))
698 mp_msg(MSGT_ASS
, MSGL_V
, "stub: \\xbord%.2f\n", val
);
699 } else if (mystrcmp(&p
, "ybord")) {
701 if (mystrtod(&p
, &val
))
702 mp_msg(MSGT_ASS
, MSGL_V
, "stub: \\ybord%.2f\n", val
);
703 } else if (mystrcmp(&p
, "xshad")) {
705 if (mystrtoi(&p
, &val
))
706 mp_msg(MSGT_ASS
, MSGL_V
, "stub: \\xshad%d\n", val
);
707 } else if (mystrcmp(&p
, "yshad")) {
709 if (mystrtoi(&p
, &val
))
710 mp_msg(MSGT_ASS
, MSGL_V
, "stub: \\yshad%d\n", val
);
711 } else if (mystrcmp(&p
, "fax")) {
713 if (mystrtoi(&p
, &val
))
714 mp_msg(MSGT_ASS
, MSGL_V
, "stub: \\fax%d\n", val
);
715 } else if (mystrcmp(&p
, "fay")) {
717 if (mystrtoi(&p
, &val
))
718 mp_msg(MSGT_ASS
, MSGL_V
, "stub: \\fay%d\n", val
);
719 } else if (mystrcmp(&p
, "iclip")) {
723 res
&= mystrtoi(&p
, &x0
);
725 res
&= mystrtoi(&p
, &y0
);
727 res
&= mystrtoi(&p
, &x1
);
729 res
&= mystrtoi(&p
, &y1
);
731 mp_msg(MSGT_ASS
, MSGL_V
, "stub: \\iclip(%d,%d,%d,%d)\n", x0
, y0
, x1
, y1
);
732 } else if (mystrcmp(&p
, "blur")) {
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
;
739 render_context
.blur
= 0.0;
741 } else if (mystrcmp(&p
, "fsc")) {
745 if (mystrtod(&p
, &val
)) {
747 render_context
.scale_x
= render_context
.scale_x
* ( 1 - pwr
) + val
* pwr
;
749 render_context
.scale_x
= render_context
.style
->ScaleX
;
750 } else if (tp
== 'y') {
751 if (mystrtod(&p
, &val
)) {
753 render_context
.scale_y
= render_context
.scale_y
* ( 1 - pwr
) + val
* pwr
;
755 render_context
.scale_y
= render_context
.style
->ScaleY
;
757 } else if (mystrcmp(&p
, "fsp")) {
759 if (mystrtod(&p
, &val
))
760 render_context
.hspacing
= render_context
.hspacing
* ( 1 - pwr
) + val
* pwr
;
762 render_context
.hspacing
= render_context
.style
->Spacing
;
763 } else if (mystrcmp(&p
, "fs")) {
765 if (mystrtod(&p
, &val
))
766 val
= render_context
.font_size
* ( 1 - pwr
) + val
* pwr
;
768 val
= render_context
.style
->FontSize
;
769 if (render_context
.font
)
770 change_font_size(val
);
771 } else if (mystrcmp(&p
, "bord")) {
773 if (mystrtod(&p
, &val
))
774 val
= render_context
.border
* ( 1 - pwr
) + val
* pwr
;
776 val
= -1.; // reset to default
778 } else if (mystrcmp(&p
, "move")) {
780 long long t1
, t2
, delta_t
, t
;
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
);
800 t2
= render_context
.event
->Duration
;
801 mp_msg(MSGT_ASS
, MSGL_DBG2
, "movement: (%d, %d) -> (%d, %d)\n", x1
, y1
, x2
, y2
);
805 t
= frame_context
.time
- render_context
.event
->Start
;
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
;
819 } else if (mystrcmp(&p
, "frx")) {
821 if (mystrtod(&p
, &val
)) {
823 render_context
.frx
= val
* pwr
+ render_context
.frx
* (1-pwr
);
825 render_context
.frx
= 0.;
826 } else if (mystrcmp(&p
, "fry")) {
828 if (mystrtod(&p
, &val
)) {
830 render_context
.fry
= val
* pwr
+ render_context
.fry
* (1-pwr
);
832 render_context
.fry
= 0.;
833 } else if (mystrcmp(&p
, "frz") || mystrcmp(&p
, "fr")) {
835 if (mystrtod(&p
, &val
)) {
837 render_context
.frz
= val
* pwr
+ render_context
.frz
* (1-pwr
);
839 render_context
.frz
= M_PI
* render_context
.style
->Angle
/ 180.;
840 } else if (mystrcmp(&p
, "fn")) {
845 family
= malloc(p
- start
+ 1);
846 strncpy(family
, start
, p
- start
);
847 family
[p
- start
] = '\0';
849 family
= strdup(render_context
.style
->FontName
);
850 if (render_context
.family
)
851 free(render_context
.family
);
852 render_context
.family
= family
;
854 } else if (mystrcmp(&p
, "alpha")) {
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
);
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
);
868 } else if (mystrcmp(&p
, "an")) {
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
876 mp_msg(MSGT_ASS
, MSGL_DBG2
, "align %d\n", val
);
877 render_context
.alignment
= val
;
879 render_context
.alignment
= render_context
.style
->Alignment
;
880 } else if (mystrcmp(&p
, "a")) {
882 if (mystrtoi(&p
, &val
) && val
)
883 render_context
.alignment
= val
;
885 render_context
.alignment
= render_context
.style
->Alignment
;
886 } else if (mystrcmp(&p
, "pos")) {
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
;
900 } else if (mystrcmp(&p
, "fad")) {
902 long long t1
, t2
, t3
, t4
;
903 if (*p
== 'e') ++p
; // either \fad or \fade
909 // 2-argument version (\fad, according to specs)
910 // a1 and a2 are fade-in and fade-out durations
912 t4
= render_context
.event
->Duration
;
919 // 6-argument version (\fade)
920 // a1 and a2 (and a3) are opacity values
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")) {
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")) {
952 long long t1
, t2
, t
, delta_t
;
955 for (cnt
= 0; cnt
< 3; ++cnt
) {
958 v
[cnt
] = strtod(p
, &p
);
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];
968 v1
= 0; v2
= render_context
.event
->Duration
; v3
= 1.;
970 render_context
.detect_collisions
= 0;
976 t
= frame_context
.time
- render_context
.event
->Start
; // FIXME: move to render_context
982 assert(delta_t
!= 0.);
983 k
= pow(((double)(t
- t1
)) / delta_t
, v3
);
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
989 } else if (mystrcmp(&p
, "clip")) {
993 res
&= mystrtoi(&p
, &x0
);
995 res
&= mystrtoi(&p
, &y0
);
997 res
&= mystrtoi(&p
, &x1
);
999 res
&= mystrtoi(&p
, &y1
);
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
;
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
;
1012 } else if (mystrcmp(&p
, "c")) {
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"))) {
1023 assert((n
>= '1') && (n
<= '4'));
1024 if (!strtocolor(&p
, &val
))
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
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;
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")) {
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
;
1048 render_context
.be
= 0;
1049 } else if (mystrcmp(&p
, "b")) {
1051 if (mystrtoi(&p
, &b
)) {
1053 render_context
.bold
= b
;
1055 render_context
.bold
= render_context
.style
->Bold
;
1057 } else if (mystrcmp(&p
, "i")) {
1059 if (mystrtoi(&p
, &i
)) {
1061 render_context
.italic
= i
;
1063 render_context
.italic
= render_context
.style
->Italic
;
1065 } else if (mystrcmp(&p
, "kf") || mystrcmp(&p
, "K")) {
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")) {
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")) {
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")) {
1088 if (mystrtoi(&p
, &val
))
1089 render_context
.shadow
= val
;
1091 render_context
.shadow
= render_context
.style
->Shadow
;
1092 } else if (mystrcmp(&p
, "pbo")) {
1094 mystrtoi(&p
, &val
); // ignored
1095 } else if (mystrcmp(&p
, "p")) {
1097 if (!mystrtoi(&p
, &val
))
1099 render_context
.drawing_mode
= !!val
;
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
1114 static unsigned get_next_char(char** str
)
1118 if (*p
== '{') { // '\0' goes here
1121 p
= parse_tag(p
, 1.);
1122 if (*p
== '}') { // end of tag
1129 } else if (*p
!= '\\')
1130 mp_msg(MSGT_ASS
, MSGL_V
, "Unable to parse: \"%s\" \n", p
);
1141 if ((*(p
+1) == 'N') || ((*(p
+1) == 'n') && (frame_context
.track
->WrapStyle
== 2))) {
1145 } else if ((*(p
+1) == 'n') || (*(p
+1) == 'h')) {
1151 chr
= utf8_get_char((const char **)&p
);
1156 static void apply_transition_effects(ass_event_t
* event
)
1160 char* p
= event
->Effect
;
1162 if (!p
|| !*p
) return;
1165 while (cnt
< 4 && (p
= strchr(p
, ';'))) {
1166 v
[cnt
++] = atoi(++p
);
1169 if (strncmp(event
->Effect
, "Banner;", 7) == 0) {
1172 mp_msg(MSGT_ASS
, MSGL_V
, "Error parsing effect: %s \n", event
->Effect
);
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
;
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
;
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
;
1192 mp_msg(MSGT_ASS
, MSGL_V
, "Unknown transition effect: %s \n", event
->Effect
);
1195 // parse scroll up/down parameters
1200 mp_msg(MSGT_ASS
, MSGL_V
, "Error parsing effect: %s \n", event
->Effect
);
1204 if (delay
== 0) delay
= 1; // ?
1205 render_context
.scroll_shift
= (frame_context
.time
- render_context
.event
->Start
) / delay
;
1207 y0
= v
[0]; y1
= v
[1];
1209 y0
= v
[1]; y1
= v
[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;
1222 * \brief partially reset render_context to style values
1223 * Works like {\r}: resets some style overrides
1225 static void reset_render_context(void)
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
;
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
;
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.;
1250 // FIXME: does not reset unsupported attributes.
1254 * \brief Start new event. Reset render_context.
1256 static void init_render_context(ass_event_t
* event
)
1258 render_context
.event
= event
;
1259 render_context
.style
= frame_context
.track
->styles
+ event
->Style
;
1261 reset_render_context();
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;
1281 apply_transition_effects(event
);
1284 static void free_render_context(void)
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
1298 static void get_outline_glyph(int symbol
, glyph_info_t
* info
, FT_Vector
* advance
)
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
;
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;
1313 memset(info
, 0, sizeof(glyph_info_t
));
1315 val
= cache_find_glyph(&key
);
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
;
1325 info
->glyph
= ass_font_get_glyph(frame_context
.ass_priv
->fontconfig_priv
, render_context
.font
, symbol
, global_settings
->hinting
);
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
);
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
1336 mp_msg(MSGT_ASS
, MSGL_WARN
, MSGTR_LIBASS_FT_Glyph_Stroke_Error
, error
);
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
);
1350 static void transform_3d(FT_Vector shift
, FT_Glyph
* glyph
, FT_Glyph
* glyph2
, double frx
, double fry
, double frz
);
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).
1360 static void get_bitmap_glyph(glyph_info_t
* info
)
1362 bitmap_hash_val_t
* val
;
1363 bitmap_hash_key_t
* key
= &info
->hash_key
;
1365 val
= cache_find_bitmap(key
);
1370 info
->bm_o
= val
->bm_o
;
1371 info
->bm_s
= val
->bm_s
;
1374 bitmap_hash_val_t hash_val
;
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
);
1382 transform_3d(shift
, &info
->glyph
, &info
->outline_glyph
, info
->frx
, info
->fry
, info
->frz
);
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
);
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
);
1400 // deallocate glyphs
1402 FT_Done_Glyph(info
->glyph
);
1403 if (info
->outline_glyph
)
1404 FT_Done_Glyph(info
->outline_glyph
);
1408 * This function goes through text_info and calculates text parameters.
1409 * The following text_info fields are filled:
1415 static void measure_text(void)
1417 int cur_line
= 0, max_asc
= 0, max_desc
= 0;
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
;
1426 max_asc
= max_desc
= 0;
1428 if (i
< text_info
.length
) {
1429 glyph_info_t
* cur
= text_info
.glyphs
+ i
;
1430 if (cur
->asc
> max_asc
)
1432 if (cur
->desc
> max_desc
)
1433 max_desc
= cur
->desc
;
1436 text_info
.height
+= (text_info
.n_lines
- 1) * double_to_d6(global_settings
->line_spacing
);
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.
1448 static void wrap_lines_smart(int max_text_width
)
1451 glyph_info_t
*cur
, *s1
, *e1
, *s2
, *s3
, *w
;
1460 text_info
.n_lines
= 1;
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
;
1467 s_offset
= s1
->bbox
.xMin
+ s1
->pos
.x
;
1468 len
= (cur
->bbox
.xMax
+ cur
->pos
.x
) - s_offset
;
1470 if (cur
->symbol
== '\n') {
1473 mp_msg(MSGT_ASS
, MSGL_DBG2
, "forced line break at %d\n", break_at
);
1476 if (len
>= max_text_width
) {
1478 break_at
= last_space
;
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
);
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
) {
1493 // no more linebreaks
1494 for (j
= lead
; j
< text_info
.length
; ++j
)
1495 text_info
.glyphs
[j
].linebreak
= 0;
1498 if (lead
< text_info
.length
)
1499 text_info
.glyphs
[lead
].linebreak
= break_type
;
1501 s1
= text_info
.glyphs
+ lead
;
1502 s_offset
= s1
->bbox
.xMin
+ s1
->pos
.x
;
1503 text_info
.n_lines
++;
1506 if (cur
->symbol
== ' ')
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)
1514 #define DIFF(x,y) (((x) < (y)) ? (y - x) : (x - y))
1518 w
= s3
= text_info
.glyphs
;
1520 for (i
= 0; i
<= text_info
.length
; ++i
) {
1521 cur
= text_info
.glyphs
+ i
;
1522 if ((i
== text_info
.length
) || cur
->linebreak
) {
1526 if (s1
&& (s2
->linebreak
== 1)) { // have at least 2 lines, and linebreak is 'soft'
1527 int l1
, l2
, l1_new
, l2_new
;
1530 do { --w
; } while ((w
> s1
) && (w
->symbol
== ' '));
1531 while ((w
> s1
) && (w
->symbol
!= ' ')) { --w
; }
1533 while ((e1
> s1
) && (e1
->symbol
== ' ')) { --e1
; }
1534 if (w
->symbol
== ' ') ++w
;
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
);
1541 if (DIFF(l1_new
, l2_new
) < DIFF(l1
, l2
)) {
1548 if (i
== text_info
.length
)
1553 assert(text_info
.n_lines
>= 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
;
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
);
1570 cur
->pos
.x
+= pen_shift_x
;
1571 cur
->pos
.y
+= pen_shift_y
;
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.
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).
1586 static void process_karaoke_effects(void)
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
1592 int timing
; // current timing
1593 int tm_start
, tm_end
; // timings at start and end of the current word
1599 tm_current
= frame_context
.time
- render_context
.event
->Start
;
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
)) {
1609 tm_start
= timing
+ s1
->effect_skip_timing
;
1610 tm_end
= tm_start
+ s1
->effect_timing
;
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
);
1619 dt
= (tm_current
- tm_start
);
1620 if ((s1
->effect_type
== EF_KARAOKE
) || (s1
->effect_type
== EF_KARAOKE_KO
)) {
1625 } else if (s1
->effect_type
== EF_KARAOKE_KF
) {
1626 dt
/= (tm_end
- tm_start
);
1627 x
= x_start
+ (x_end
- x_start
) * dt
;
1629 mp_msg(MSGT_ASS
, MSGL_ERR
, MSGTR_LIBASS_UnknownEffectType_InternalError
);
1633 for (cur2
= s1
; cur2
<= e1
; ++cur2
) {
1634 cur2
->effect_type
= s1
->effect_type
;
1635 cur2
->effect_timing
= x
- cur2
->pos
.x
;
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
1648 static void get_base_point(FT_BBox bbox
, int alignment
, int* bx
, int* by
)
1650 const int halign
= alignment
& 3;
1651 const int valign
= alignment
& 12;
1658 *bx
= (bbox
.xMax
+ bbox
.xMin
) / 2;
1670 *by
= (bbox
.yMax
+ bbox
.yMin
) / 2;
1679 * \brief Multiply 4-vector by 4-matrix
1681 * \param m 4-matrix]
1682 * \param b out: 4-vector
1683 * Calculates a * m and stores result in b
1685 static inline void transform_point_3d(double *a
, double *m
, double *b
)
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];
1694 * \brief Apply 3d transformation to a vector
1695 * \param v FreeType vector (2d)
1697 * Transforms v by m, projects the result back to the screen plane
1698 * Result is returned in v.
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.;
1704 a
[0] = d6_to_double(v
->x
);
1705 a
[1] = d6_to_double(v
->y
);
1708 transform_point_3d(a
, m
, b
);
1709 /* Apply perspective projection with the following matrix:
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. */
1720 b
[3] = 8 * b
[2] + camera
;
1721 if (b
[3] < cutoff_z
)
1723 v
->x
= double_to_d6(b
[0] / b
[3]);
1724 v
->y
= double_to_d6(b
[1] / b
[3]);
1728 * \brief Apply 3d transformation to a glyph
1729 * \param glyph FreeType glyph
1731 * Transforms glyph by m, projects the result back to the screen plane
1732 * Result is returned in glyph.
1734 static inline void transform_glyph_3d(FT_Glyph glyph
, double *m
, FT_Vector shift
) {
1736 FT_Outline
* outline
= &((FT_OutlineGlyph
)glyph
)->outline
;
1737 FT_Vector
* p
= outline
->points
;
1739 for (i
=0; i
<outline
->n_points
; i
++) {
1742 transform_vector_3d(p
+ i
, m
);
1747 //transform_vector_3d(&glyph->advance, m);
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.
1760 static void transform_3d(FT_Vector shift
, FT_Glyph
* glyph
, FT_Glyph
* glyph2
, double frx
, double fry
, double frz
)
1762 fry
= - fry
; // FreeType's y axis goes in the opposite direction
1763 if (frx
!= 0. || fry
!= 0. || frz
!= 0.) {
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;
1776 if (glyph
&& *glyph
)
1777 transform_glyph_3d(*glyph
, m
, shift
);
1779 if (glyph2
&& *glyph2
)
1780 transform_glyph_3d(*glyph2
, m
, shift
);
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.
1789 static int ass_render_event(ass_event_t
* event
, event_images_t
* event_images
)
1799 int MarginL
, MarginR
, MarginV
;
1801 int alignment
, halign
, valign
;
1802 int device_x
= 0, device_y
= 0;
1804 if (event
->Style
>= frame_context
.track
->n_styles
) {
1805 mp_msg(MSGT_ASS
, MSGL_WARN
, MSGTR_LIBASS_NoStyleFound
);
1809 mp_msg(MSGT_ASS
, MSGL_WARN
, MSGTR_LIBASS_EmptyEvent
);
1813 init_render_context(event
);
1815 text_info
.length
= 0;
1823 // get next char, executing style override
1824 // this affects render_context
1826 code
= get_next_char(&p
);
1827 } while (code
&& render_context
.drawing_mode
); // skip everything in drawing mode
1829 // face could have been changed in get_next_char
1830 if (!render_context
.font
) {
1831 free_render_context();
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
);
1844 if ( previous
&& code
) {
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
;
1851 shift
.x
= pen
.x
& 63;
1852 shift
.y
= pen
.y
& 63;
1854 ass_font_set_transform(render_context
.font
,
1855 render_context
.scale_x
* frame_context
.font_scale_x
,
1856 render_context
.scale_y
,
1859 get_outline_glyph(code
, text_info
.glyphs
+ text_info
.length
, &shift
);
1861 text_info
.glyphs
[text_info
.length
].pos
.x
= pen
.x
>> 6;
1862 text_info
.glyphs
[text_info
.length
].pos
.y
= pen
.y
>> 6;
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
;
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
;
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
;
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
;
1910 render_context
.effect_type
= EF_NONE
;
1911 render_context
.effect_timing
= 0;
1912 render_context
.effect_skip_timing
= 0;
1915 if (text_info
.length
== 0) {
1916 // no valid symbols in the event; this can be smth like {comment}
1917 free_render_context();
1921 // depends on glyph x coordinates being monotonous, so it should be done before line wrap
1922 process_karaoke_effects();
1925 alignment
= render_context
.alignment
;
1926 halign
= alignment
& 3;
1927 valign
= alignment
& 12;
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
;
1933 if (render_context
.evt_type
!= EVENT_HSCROLL
) {
1936 // calculate max length of a line
1937 max_text_width
= x2scr(frame_context
.track
->PlayResX
- MarginR
) - x2scr(MarginL
);
1939 // rearrange text in several lines
1940 wrap_lines_smart(max_text_width
);
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;
1950 while ((last_glyph
> first_glyph
) && ((last_glyph
->symbol
== '\n') || (last_glyph
->symbol
== 0)))
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
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;
1961 for (j
= last_break
+ 1; j
< i
; ++j
) {
1962 text_info
.glyphs
[j
].pos
.x
+= shift
;
1967 } else { // render_context.evt_type == EVENT_HSCROLL
1971 // determing text bounding box
1972 compute_string_bbox(&text_info
, &bbox
);
1974 // determine device coordinates for text
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
);
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
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
);
2001 device_y
-= d6_to_int(text_info
.height
);
2002 device_y
+= d6_to_int(text_info
.lines
[0].asc
);
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
);
2011 // positioned events are totally different
2012 if (render_context
.evt_type
== EVENT_POSITIONED
) {
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
;
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
);
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
);
2042 // calculate rotation parameters
2046 if (render_context
.have_origin
) {
2047 center
.x
= x2scr(render_context
.org_x
);
2048 center
.y
= y2scr(render_context
.org_y
);
2051 get_base_point(bbox
, alignment
, &bx
, &by
);
2052 center
.x
= device_x
+ bx
;
2053 center
.y
= device_y
+ by
;
2056 for (i
= 0; i
< text_info
.length
; ++i
) {
2057 glyph_info_t
* info
= text_info
.glyphs
+ i
;
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
);
2063 info
->hash_key
.shift_x
= 0;
2064 info
->hash_key
.shift_y
= 0;
2069 // convert glyphs to bitmaps
2070 for (i
= 0; i
< text_info
.length
; ++i
)
2071 get_bitmap_glyph(text_info
.glyphs
+ i
);
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
);
2080 free_render_context();
2086 * \brief deallocate image list
2087 * \param img list pointer
2089 void ass_free_images(ass_image_t
* img
)
2092 ass_image_t
* next
= img
->next
;
2098 static void ass_reconfigure(ass_renderer_t
* priv
)
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;
2107 void ass_set_frame_size(ass_renderer_t
* priv
, int w
, int h
)
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
);
2118 void ass_set_margins(ass_renderer_t
* priv
, int t
, int b
, int l
, int r
)
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
);
2132 void ass_set_use_margins(ass_renderer_t
* priv
, int use
)
2134 priv
->settings
.use_margins
= use
;
2137 void ass_set_aspect_ratio(ass_renderer_t
* priv
, double ar
)
2139 if (priv
->settings
.aspect
!= ar
) {
2140 priv
->settings
.aspect
= ar
;
2141 ass_reconfigure(priv
);
2145 void ass_set_font_scale(ass_renderer_t
* priv
, double font_scale
)
2147 if (priv
->settings
.font_size_coeff
!= font_scale
) {
2148 priv
->settings
.font_size_coeff
= font_scale
;
2149 ass_reconfigure(priv
);
2153 void ass_set_hinting(ass_renderer_t
* priv
, ass_hinting_t ht
)
2155 if (priv
->settings
.hinting
!= ht
) {
2156 priv
->settings
.hinting
= ht
;
2157 ass_reconfigure(priv
);
2161 void ass_set_line_spacing(ass_renderer_t
* priv
, double line_spacing
)
2163 priv
->settings
.line_spacing
= line_spacing
;
2166 static int ass_set_fonts_(ass_renderer_t
* priv
, const char* default_font
, const char* default_family
, int fc
)
2168 if (priv
->settings
.default_font
)
2169 free(priv
->settings
.default_font
);
2170 if (priv
->settings
.default_family
)
2171 free(priv
->settings
.default_family
);
2173 priv
->settings
.default_font
= default_font
? strdup(default_font
) : 0;
2174 priv
->settings
.default_family
= default_family
? strdup(default_family
) : 0;
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
);
2180 return !!priv
->fontconfig_priv
;
2183 int ass_set_fonts(ass_renderer_t
* priv
, const char* default_font
, const char* default_family
)
2185 return ass_set_fonts_(priv
, default_font
, default_family
, 1);
2188 int ass_set_fonts_nofc(ass_renderer_t
* priv
, const char* default_font
, const char* default_family
)
2190 return ass_set_fonts_(priv
, default_font
, default_family
, 0);
2194 * \brief Start a new frame
2196 static int ass_start_frame(ass_renderer_t
*priv
, ass_track_t
* track
, long long now
)
2198 ass_renderer
= priv
;
2199 global_settings
= &priv
->settings
;
2201 if (!priv
->settings
.frame_width
&& !priv
->settings
.frame_height
)
2202 return 1; // library not initialized
2204 if (track
->n_events
== 0)
2205 return 1; // nothing to do
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
;
2221 ass_lazy_track_init();
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
;
2227 if (frame_context
.orig_width
* track
->PlayResY
== frame_context
.orig_height
* track
->PlayResX
)
2228 frame_context
.font_scale_x
= 1.;
2230 frame_context
.font_scale_x
= ((double)(frame_context
.orig_width
* track
->PlayResY
)) / (frame_context
.orig_height
* track
->PlayResX
);
2232 priv
->prev_images_root
= priv
->images_root
;
2233 priv
->images_root
= 0;
2238 static int cmp_event_layer(const void* p1
, const void* p2
)
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
)
2244 if (e1
->Layer
> e2
->Layer
)
2246 if (e1
->ReadOrder
< e2
->ReadOrder
)
2248 if (e1
->ReadOrder
> e2
->ReadOrder
)
2253 #define MAX_EVENTS 100
2255 static render_priv_t
* get_render_priv(ass_event_t
* event
)
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
;
2264 return event
->render_priv
;
2267 typedef struct segment_s
{
2268 int a
, b
; // top and height
2271 static int overlap(segment_t
* s1
, segment_t
* s2
)
2273 if (s1
->a
>= s2
->b
|| s2
->a
>= s1
->b
)
2278 static int cmp_segment(const void* p1
, const void* p2
)
2280 return ((segment_t
*)p1
)->a
- ((segment_t
*)p2
)->a
;
2283 static void shift_event(event_images_t
* ei
, int shift
)
2285 ass_image_t
* cur
= ei
->imgs
;
2287 cur
->dst_y
+= shift
;
2288 // clip top and bottom
2289 if (cur
->dst_y
< 0) {
2290 int clip
= - cur
->dst_y
;
2292 cur
->bitmap
+= clip
* cur
->stride
;
2295 if (cur
->dst_y
+ cur
->h
>= frame_context
.height
) {
2296 int clip
= cur
->dst_y
+ cur
->h
- frame_context
.height
;
2308 // dir: 1 - move down
2310 static int fit_segment(segment_t
* s
, segment_t
* fixed
, int* cnt
, int dir
)
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
)
2319 shift
= fixed
[i
].b
- s
->a
;
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
)
2325 shift
= fixed
[i
].a
- s
->b
;
2328 fixed
[*cnt
].a
= s
->a
+ shift
;
2329 fixed
[*cnt
].b
= s
->b
+ shift
;
2331 qsort(fixed
, *cnt
, sizeof(segment_t
), cmp_segment
);
2336 static void fix_collisions(event_images_t
* imgs
, int cnt
)
2338 segment_t used
[MAX_EVENTS
];
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
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
);
2356 for (j
= 0; j
< cnt_used
; ++j
)
2357 if (overlap(&s
, used
+ j
)) { // no, it's not
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
;
2365 shift_event(imgs
+ i
, priv
->top
- imgs
[i
].top
);
2369 qsort(used
, cnt_used
, sizeof(segment_t
), cmp_segment
);
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
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
);
2384 priv
->top
= imgs
[i
].top
;
2385 priv
->height
= imgs
[i
].height
;
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
2397 int ass_image_compare(ass_image_t
*i1
, ass_image_t
*i2
)
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
)
2405 if (i1
->dst_x
!= i2
->dst_x
) return 1;
2406 if (i1
->dst_y
!= i2
->dst_y
) return 1;
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
2415 int ass_detect_change(ass_renderer_t
*priv
)
2417 ass_image_t
* img
, *img2
;
2420 img
= priv
->prev_images_root
;
2421 img2
= priv
->images_root
;
2423 while (img
&& diff
< 2) {
2424 ass_image_t
* next
, *next2
;
2427 int d
= ass_image_compare(img
, img2
);
2428 if (d
> diff
) diff
= d
;
2431 // previous list is shorter
2439 // is the previous list longer?
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.
2455 ass_image_t
* ass_render_frame(ass_renderer_t
*priv
, ass_track_t
* track
, long long now
, int* detect_change
)
2458 event_images_t
* last
;
2462 rc
= ass_start_frame(priv
, track
, now
);
2466 // render events separately
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
));
2475 rc
= ass_render_event(event
, priv
->eimg
+ cnt
);
2481 qsort(priv
->eimg
, cnt
, sizeof(event_images_t
), cmp_event_layer
);
2483 // call fix_collisions for each group of events with the same layer
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
;
2491 fix_collisions(last
, priv
->eimg
+ cnt
- last
);
2494 tail
= &ass_renderer
->images_root
;
2495 for (i
= 0; i
< cnt
; ++i
) {
2496 ass_image_t
* cur
= priv
->eimg
[i
].imgs
;
2505 *detect_change
= ass_detect_change(priv
);
2507 // free the previous image list
2508 ass_free_images(priv
->prev_images_root
);
2509 priv
->prev_images_root
= 0;
2511 return ass_renderer
->images_root
;