2 * Copyright (C) 2006 Evgeniy Stepanov <eugeni.stepanov@gmail.com>
4 * This file is part of libass.
6 * libass is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * libass is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License along
17 * with libass; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
26 #include "ass_render.h"
27 #include "ass_parse.h"
29 #define MAX_GLYPHS_INITIAL 1024
30 #define MAX_LINES_INITIAL 64
31 #define SUBPIXEL_MASK 63
32 #define SUBPIXEL_ACCURACY 7
34 static void ass_lazy_track_init(ASS_Renderer
*render_priv
)
36 ASS_Track
*track
= render_priv
->track
;
38 if (track
->PlayResX
&& track
->PlayResY
)
40 if (!track
->PlayResX
&& !track
->PlayResY
) {
41 ass_msg(render_priv
->library
, MSGL_WARN
,
42 "Neither PlayResX nor PlayResY defined. Assuming 384x288");
43 track
->PlayResX
= 384;
44 track
->PlayResY
= 288;
46 if (!track
->PlayResY
&& track
->PlayResX
== 1280) {
47 track
->PlayResY
= 1024;
48 ass_msg(render_priv
->library
, MSGL_WARN
,
49 "PlayResY undefined, setting to %d", track
->PlayResY
);
50 } else if (!track
->PlayResY
) {
51 track
->PlayResY
= track
->PlayResX
* 3 / 4;
52 ass_msg(render_priv
->library
, MSGL_WARN
,
53 "PlayResY undefined, setting to %d", track
->PlayResY
);
54 } else if (!track
->PlayResX
&& track
->PlayResY
== 1024) {
55 track
->PlayResX
= 1280;
56 ass_msg(render_priv
->library
, MSGL_WARN
,
57 "PlayResX undefined, setting to %d", track
->PlayResX
);
58 } else if (!track
->PlayResX
) {
59 track
->PlayResX
= track
->PlayResY
* 4 / 3;
60 ass_msg(render_priv
->library
, MSGL_WARN
,
61 "PlayResX undefined, setting to %d", track
->PlayResX
);
66 ASS_Renderer
*ass_renderer_init(ASS_Library
*library
)
70 ASS_Renderer
*priv
= 0;
71 int vmajor
, vminor
, vpatch
;
73 error
= FT_Init_FreeType(&ft
);
75 ass_msg(library
, MSGL_FATAL
, "%s failed", "FT_Init_FreeType");
79 FT_Library_Version(ft
, &vmajor
, &vminor
, &vpatch
);
80 ass_msg(library
, MSGL_V
, "FreeType library version: %d.%d.%d",
81 vmajor
, vminor
, vpatch
);
82 ass_msg(library
, MSGL_V
, "FreeType headers version: %d.%d.%d",
83 FREETYPE_MAJOR
, FREETYPE_MINOR
, FREETYPE_PATCH
);
85 priv
= calloc(1, sizeof(ASS_Renderer
));
91 priv
->synth_priv
= ass_synth_init(BLUR_MAX_RADIUS
);
93 priv
->library
= library
;
95 // images_root and related stuff is zero-filled in calloc
97 priv
->cache
.font_cache
= ass_font_cache_init(library
);
98 priv
->cache
.bitmap_cache
= ass_bitmap_cache_init(library
);
99 priv
->cache
.composite_cache
= ass_composite_cache_init(library
);
100 priv
->cache
.glyph_cache
= ass_glyph_cache_init(library
);
101 priv
->cache
.glyph_max
= GLYPH_CACHE_MAX
;
102 priv
->cache
.bitmap_max_size
= BITMAP_CACHE_MAX_SIZE
;
104 priv
->text_info
.max_glyphs
= MAX_GLYPHS_INITIAL
;
105 priv
->text_info
.max_lines
= MAX_LINES_INITIAL
;
106 priv
->text_info
.glyphs
= calloc(MAX_GLYPHS_INITIAL
, sizeof(GlyphInfo
));
107 priv
->text_info
.lines
= calloc(MAX_LINES_INITIAL
, sizeof(LineInfo
));
109 priv
->settings
.font_size_coeff
= 1.;
113 ass_msg(library
, MSGL_V
, "Init");
115 ass_msg(library
, MSGL_ERR
, "Init failed");
120 static void free_list_clear(ASS_Renderer
*render_priv
)
122 if (render_priv
->free_head
) {
123 FreeList
*item
= render_priv
->free_head
;
130 render_priv
->free_head
= NULL
;
134 void ass_renderer_done(ASS_Renderer
*render_priv
)
136 ass_font_cache_done(render_priv
->cache
.font_cache
);
137 ass_bitmap_cache_done(render_priv
->cache
.bitmap_cache
);
138 ass_composite_cache_done(render_priv
->cache
.composite_cache
);
139 ass_glyph_cache_done(render_priv
->cache
.glyph_cache
);
141 ass_free_images(render_priv
->images_root
);
142 ass_free_images(render_priv
->prev_images_root
);
144 if (render_priv
->state
.stroker
) {
145 FT_Stroker_Done(render_priv
->state
.stroker
);
146 render_priv
->state
.stroker
= 0;
148 if (render_priv
->ftlibrary
)
149 FT_Done_FreeType(render_priv
->ftlibrary
);
150 if (render_priv
->fontconfig_priv
)
151 fontconfig_done(render_priv
->fontconfig_priv
);
152 if (render_priv
->synth_priv
)
153 ass_synth_done(render_priv
->synth_priv
);
154 free(render_priv
->eimg
);
155 free(render_priv
->text_info
.glyphs
);
156 free(render_priv
->text_info
.lines
);
158 free(render_priv
->settings
.default_font
);
159 free(render_priv
->settings
.default_family
);
161 free_list_clear(render_priv
);
166 * \brief Create a new ASS_Image
167 * Parameters are the same as ASS_Image fields.
169 static ASS_Image
*my_draw_bitmap(unsigned char *bitmap
, int bitmap_w
,
170 int bitmap_h
, int stride
, int dst_x
,
171 int dst_y
, uint32_t color
)
173 ASS_Image
*img
= malloc(sizeof(ASS_Image
));
178 img
->stride
= stride
;
179 img
->bitmap
= bitmap
;
189 * \brief Mapping between script and screen coordinates
191 static double x2scr(ASS_Renderer
*render_priv
, double x
)
193 return x
* render_priv
->orig_width_nocrop
/ render_priv
->font_scale_x
/
194 render_priv
->track
->PlayResX
+
195 FFMAX(render_priv
->settings
.left_margin
, 0);
197 static double x2scr_pos(ASS_Renderer
*render_priv
, double x
)
199 return x
* render_priv
->orig_width
/ render_priv
->font_scale_x
/ render_priv
->track
->PlayResX
+
200 render_priv
->settings
.left_margin
;
202 static double x2scr_scaled(ASS_Renderer
*render_priv
, double x
)
204 return x
* render_priv
->orig_width_nocrop
/
205 render_priv
->track
->PlayResX
+
206 FFMAX(render_priv
->settings
.left_margin
, 0);
208 static double x2scr_pos_scaled(ASS_Renderer
*render_priv
, double x
)
210 return x
* render_priv
->orig_width
/ render_priv
->track
->PlayResX
+
211 render_priv
->settings
.left_margin
;
214 * \brief Mapping between script and screen coordinates
216 static double y2scr(ASS_Renderer
*render_priv
, double y
)
218 return y
* render_priv
->orig_height_nocrop
/
219 render_priv
->track
->PlayResY
+
220 FFMAX(render_priv
->settings
.top_margin
, 0);
222 static double y2scr_pos(ASS_Renderer
*render_priv
, double y
)
224 return y
* render_priv
->orig_height
/ render_priv
->track
->PlayResY
+
225 render_priv
->settings
.top_margin
;
228 // the same for toptitles
229 static double y2scr_top(ASS_Renderer
*render_priv
, double y
)
231 if (render_priv
->settings
.use_margins
)
232 return y
* render_priv
->orig_height_nocrop
/
233 render_priv
->track
->PlayResY
;
235 return y
* render_priv
->orig_height_nocrop
/
236 render_priv
->track
->PlayResY
+
237 FFMAX(render_priv
->settings
.top_margin
, 0);
239 // the same for subtitles
240 static double y2scr_sub(ASS_Renderer
*render_priv
, double y
)
242 if (render_priv
->settings
.use_margins
)
243 return y
* render_priv
->orig_height_nocrop
/
244 render_priv
->track
->PlayResY
+
245 FFMAX(render_priv
->settings
.top_margin
, 0)
246 + FFMAX(render_priv
->settings
.bottom_margin
, 0);
248 return y
* render_priv
->orig_height_nocrop
/
249 render_priv
->track
->PlayResY
+
250 FFMAX(render_priv
->settings
.top_margin
, 0);
254 * \brief Convert bitmap glyphs into ASS_Image list with inverse clipping
256 * Inverse clipping with the following strategy:
257 * - find rectangle from (x0, y0) to (cx0, y1)
258 * - find rectangle from (cx0, y0) to (cx1, cy0)
259 * - find rectangle from (cx0, cy1) to (cx1, y1)
260 * - find rectangle from (cx1, y0) to (x1, y1)
261 * These rectangles can be invalid and in this case are discarded.
262 * Afterwards, they are clipped against the screen coordinates.
263 * In an additional pass, the rectangles need to be split up left/right for
264 * karaoke effects. This can result in a lot of bitmaps (6 to be exact).
266 static ASS_Image
**render_glyph_i(ASS_Renderer
*render_priv
,
267 Bitmap
*bm
, int dst_x
, int dst_y
,
268 uint32_t color
, uint32_t color2
, int brk
,
271 int i
, j
, x0
, y0
, x1
, y1
, cx0
, cy0
, cx1
, cy1
, sx
, sy
, zx
, zy
;
278 // we still need to clip against screen boundaries
279 zx
= x2scr_pos_scaled(render_priv
, 0);
280 zy
= y2scr_pos(render_priv
, 0);
281 sx
= x2scr_pos_scaled(render_priv
, render_priv
->track
->PlayResX
);
282 sy
= y2scr_pos(render_priv
, render_priv
->track
->PlayResY
);
288 cx0
= render_priv
->state
.clip_x0
- dst_x
;
289 cy0
= render_priv
->state
.clip_y0
- dst_y
;
290 cx1
= render_priv
->state
.clip_x1
- dst_x
;
291 cy1
= render_priv
->state
.clip_y1
- dst_y
;
293 // calculate rectangles and discard invalid ones while we're at it.
297 r
[i
].x1
= (cx0
> x1
) ? x1
: cx0
;
299 if (r
[i
].x1
> r
[i
].x0
&& r
[i
].y1
> r
[i
].y0
) i
++;
300 r
[i
].x0
= (cx0
< 0) ? x0
: cx0
;
302 r
[i
].x1
= (cx1
> x1
) ? x1
: cx1
;
303 r
[i
].y1
= (cy0
> y1
) ? y1
: cy0
;
304 if (r
[i
].x1
> r
[i
].x0
&& r
[i
].y1
> r
[i
].y0
) i
++;
305 r
[i
].x0
= (cx0
< 0) ? x0
: cx0
;
306 r
[i
].y0
= (cy1
< 0) ? y0
: cy1
;
307 r
[i
].x1
= (cx1
> x1
) ? x1
: cx1
;
309 if (r
[i
].x1
> r
[i
].x0
&& r
[i
].y1
> r
[i
].y0
) i
++;
310 r
[i
].x0
= (cx1
< 0) ? x0
: cx1
;
314 if (r
[i
].x1
> r
[i
].x0
&& r
[i
].y1
> r
[i
].y0
) i
++;
316 // clip each rectangle to screen coordinates
317 for (j
= 0; j
< i
; j
++) {
318 r
[j
].x0
= (r
[j
].x0
+ dst_x
< zx
) ? zx
- dst_x
: r
[j
].x0
;
319 r
[j
].y0
= (r
[j
].y0
+ dst_y
< zy
) ? zy
- dst_y
: r
[j
].y0
;
320 r
[j
].x1
= (r
[j
].x1
+ dst_x
> sx
) ? sx
- dst_x
: r
[j
].x1
;
321 r
[j
].y1
= (r
[j
].y1
+ dst_y
> sy
) ? sy
- dst_y
: r
[j
].y1
;
324 // draw the rectangles
325 for (j
= 0; j
< i
; j
++) {
327 // kick out rectangles that are invalid now
328 if (r
[j
].x1
<= r
[j
].x0
|| r
[j
].y1
<= r
[j
].y0
)
330 // split up into left and right for karaoke, if needed
331 if (lbrk
> r
[j
].x0
) {
332 if (lbrk
> r
[j
].x1
) lbrk
= r
[j
].x1
;
333 img
= my_draw_bitmap(bm
->buffer
+ r
[j
].y0
* bm
->w
+ r
[j
].x0
,
334 lbrk
- r
[j
].x0
, r
[j
].y1
- r
[j
].y0
,
335 bm
->w
, dst_x
+ r
[j
].x0
, dst_y
+ r
[j
].y0
, color
);
340 if (lbrk
< r
[j
].x1
) {
341 if (lbrk
< r
[j
].x0
) lbrk
= r
[j
].x0
;
342 img
= my_draw_bitmap(bm
->buffer
+ r
[j
].y0
* bm
->w
+ lbrk
,
343 r
[j
].x1
- lbrk
, r
[j
].y1
- r
[j
].y0
,
344 bm
->w
, dst_x
+ lbrk
, dst_y
+ r
[j
].y0
, color2
);
355 * \brief convert bitmap glyph into ASS_Image struct(s)
356 * \param bit freetype bitmap glyph, FT_PIXEL_MODE_GRAY
357 * \param dst_x bitmap x coordinate in video frame
358 * \param dst_y bitmap y coordinate in video frame
359 * \param color first color, RGBA
360 * \param color2 second color, RGBA
361 * \param brk x coordinate relative to glyph origin, color is used to the left of brk, color2 - to the right
362 * \param tail pointer to the last image's next field, head of the generated list should be stored here
363 * \return pointer to the new list tail
364 * Performs clipping. Uses my_draw_bitmap for actual bitmap convertion.
367 render_glyph(ASS_Renderer
*render_priv
, Bitmap
*bm
, int dst_x
, int dst_y
,
368 uint32_t color
, uint32_t color2
, int brk
, ASS_Image
**tail
)
370 // Inverse clipping in use?
371 if (render_priv
->state
.clip_mode
)
372 return render_glyph_i(render_priv
, bm
, dst_x
, dst_y
, color
, color2
,
375 // brk is relative to dst_x
376 // color = color left of brk
377 // color2 = color right of brk
378 int b_x0
, b_y0
, b_x1
, b_y1
; // visible part of the bitmap
379 int clip_x0
, clip_y0
, clip_x1
, clip_y1
;
388 clip_x0
= FFMINMAX(render_priv
->state
.clip_x0
, 0, render_priv
->width
);
389 clip_y0
= FFMINMAX(render_priv
->state
.clip_y0
, 0, render_priv
->height
);
390 clip_x1
= FFMINMAX(render_priv
->state
.clip_x1
, 0, render_priv
->width
);
391 clip_y1
= FFMINMAX(render_priv
->state
.clip_y1
, 0, render_priv
->height
);
397 tmp
= dst_x
- clip_x0
;
399 ass_msg(render_priv
->library
, MSGL_DBG2
, "clip left");
402 tmp
= dst_y
- clip_y0
;
404 ass_msg(render_priv
->library
, MSGL_DBG2
, "clip top");
407 tmp
= clip_x1
- dst_x
- bm
->w
;
409 ass_msg(render_priv
->library
, MSGL_DBG2
, "clip right");
412 tmp
= clip_y1
- dst_y
- bm
->h
;
414 ass_msg(render_priv
->library
, MSGL_DBG2
, "clip bottom");
418 if ((b_y0
>= b_y1
) || (b_x0
>= b_x1
))
421 if (brk
> b_x0
) { // draw left part
424 img
= my_draw_bitmap(bm
->buffer
+ bm
->w
* b_y0
+ b_x0
,
425 brk
- b_x0
, b_y1
- b_y0
, bm
->w
,
426 dst_x
+ b_x0
, dst_y
+ b_y0
, color
);
427 if (!img
) return tail
;
431 if (brk
< b_x1
) { // draw right part
434 img
= my_draw_bitmap(bm
->buffer
+ bm
->w
* b_y0
+ brk
,
435 b_x1
- brk
, b_y1
- b_y0
, bm
->w
,
436 dst_x
+ brk
, dst_y
+ b_y0
, color2
);
437 if (!img
) return tail
;
445 * \brief Replace the bitmap buffer in ASS_Image with a copy
446 * \param img ASS_Image to operate on
447 * \return pointer to old bitmap buffer
449 static unsigned char *clone_bitmap_buffer(ASS_Image
*img
)
451 unsigned char *old_bitmap
= img
->bitmap
;
452 int size
= img
->stride
* (img
->h
- 1) + img
->w
;
453 img
->bitmap
= malloc(size
);
454 memcpy(img
->bitmap
, old_bitmap
, size
);
459 * \brief Calculate overlapping area of two consecutive bitmaps and in case they
460 * overlap, blend them together
461 * Mainly useful for translucent glyphs and especially borders, to avoid the
462 * luminance adding up where they overlap (which looks ugly)
465 render_overlap(ASS_Renderer
*render_priv
, ASS_Image
**last_tail
,
468 int left
, top
, bottom
, right
;
469 int old_left
, old_top
, w
, h
, cur_left
, cur_top
;
470 int x
, y
, opos
, cpos
;
473 CompositeHashValue
*hv
;
474 CompositeHashValue chv
;
475 int ax
= (*last_tail
)->dst_x
;
476 int ay
= (*last_tail
)->dst_y
;
477 int aw
= (*last_tail
)->w
;
478 int as
= (*last_tail
)->stride
;
479 int ah
= (*last_tail
)->h
;
480 int bx
= (*tail
)->dst_x
;
481 int by
= (*tail
)->dst_y
;
483 int bs
= (*tail
)->stride
;
488 if ((*last_tail
)->bitmap
== (*tail
)->bitmap
)
491 if ((*last_tail
)->color
!= (*tail
)->color
)
494 // Calculate overlap coordinates
495 left
= (ax
> bx
) ? ax
: bx
;
496 top
= (ay
> by
) ? ay
: by
;
497 right
= ((ax
+ aw
) < (bx
+ bw
)) ? (ax
+ aw
) : (bx
+ bw
);
498 bottom
= ((ay
+ ah
) < (by
+ bh
)) ? (ay
+ ah
) : (by
+ bh
);
499 if ((right
<= left
) || (bottom
<= top
))
501 old_left
= left
- ax
;
505 cur_left
= left
- bx
;
509 hk
.a
= (*last_tail
)->bitmap
;
510 hk
.b
= (*tail
)->bitmap
;
521 hv
= cache_find_composite(render_priv
->cache
.composite_cache
, &hk
);
523 (*last_tail
)->bitmap
= hv
->a
;
524 (*tail
)->bitmap
= hv
->b
;
527 // Allocate new bitmaps and copy over data
528 a
= clone_bitmap_buffer(*last_tail
);
529 b
= clone_bitmap_buffer(*tail
);
531 // Blend overlapping area
532 for (y
= 0; y
< h
; y
++)
533 for (x
= 0; x
< w
; x
++) {
534 opos
= (old_top
+ y
) * (as
) + (old_left
+ x
);
535 cpos
= (cur_top
+ y
) * (bs
) + (cur_left
+ x
);
536 m
= FFMIN(a
[opos
] + b
[cpos
], 0xff);
537 (*last_tail
)->bitmap
[opos
] = 0;
538 (*tail
)->bitmap
[cpos
] = m
;
541 // Insert bitmaps into the cache
542 chv
.a
= (*last_tail
)->bitmap
;
543 chv
.b
= (*tail
)->bitmap
;
544 cache_add_composite(render_priv
->cache
.composite_cache
, &hk
, &chv
);
547 static void free_list_add(ASS_Renderer
*render_priv
, void *object
)
549 if (!render_priv
->free_head
) {
550 render_priv
->free_head
= calloc(1, sizeof(FreeList
));
551 render_priv
->free_head
->object
= object
;
552 render_priv
->free_tail
= render_priv
->free_head
;
554 FreeList
*l
= calloc(1, sizeof(FreeList
));
556 render_priv
->free_tail
->next
= l
;
557 render_priv
->free_tail
= render_priv
->free_tail
->next
;
562 * Iterate through a list of bitmaps and blend with clip vector, if
563 * applicable. The blended bitmaps are added to a free list which is freed
564 * at the start of a new frame.
566 static void blend_vector_clip(ASS_Renderer
*render_priv
,
570 FT_BitmapGlyph clip_bm
;
572 ASS_Drawing
*drawing
= render_priv
->state
.clip_drawing
;
580 // Try to get mask from cache
581 ass_drawing_hash(drawing
);
582 memset(&key
, 0, sizeof(key
));
584 key
.drawing_hash
= drawing
->hash
;
585 val
= cache_find_glyph(render_priv
->cache
.glyph_cache
, &key
);
588 clip_bm
= (FT_BitmapGlyph
) val
->glyph
;
592 // Not found in cache, parse and rasterize it
593 glyph
= (FT_Glyph
) *ass_drawing_parse(drawing
, 1);
595 ass_msg(render_priv
->library
, MSGL_WARN
,
596 "Clip vector parsing failed. Skipping.");
597 goto blend_vector_error
;
600 // We need to translate the clip according to screen borders
601 if (render_priv
->settings
.left_margin
!= 0 ||
602 render_priv
->settings
.top_margin
!= 0) {
604 .x
= int_to_d6(render_priv
->settings
.left_margin
),
605 .y
= -int_to_d6(render_priv
->settings
.top_margin
),
607 FT_Outline_Translate(&drawing
->glyph
->outline
,
611 // Check glyph bounding box size
612 if (check_glyph_area(render_priv
->library
, glyph
)) {
613 FT_Done_Glyph(glyph
);
615 goto blend_vector_error
;
618 ass_msg(render_priv
->library
, MSGL_DBG2
,
619 "Parsed vector clip: scales (%f, %f) string [%s]\n",
620 drawing
->scale_x
, drawing
->scale_y
, drawing
->text
);
622 error
= FT_Glyph_To_Bitmap(&glyph
, FT_RENDER_MODE_NORMAL
, 0, 1);
624 ass_msg(render_priv
->library
, MSGL_WARN
,
625 "Clip vector rasterization failed: %d. Skipping.", error
);
626 FT_Done_Glyph(glyph
);
631 clip_bm
= (FT_BitmapGlyph
) glyph
;
634 memset(&v
, 0, sizeof(v
));
636 cache_add_glyph(render_priv
->cache
.glyph_cache
, &key
, &v
);
639 if (!clip_bm
) goto blend_vector_exit
;
641 // Iterate through bitmaps and blend/clip them
642 for (cur
= head
; cur
; cur
= cur
->next
) {
643 int left
, top
, right
, bottom
, apos
, bpos
, y
, x
, w
, h
;
644 int ax
, ay
, aw
, ah
, as
;
645 int bx
, by
, bw
, bh
, bs
;
646 int aleft
, atop
, bleft
, btop
;
647 unsigned char *abuffer
, *bbuffer
, *nbuffer
;
649 abuffer
= cur
->bitmap
;
650 bbuffer
= clip_bm
->bitmap
.buffer
;
658 bw
= clip_bm
->bitmap
.width
;
659 bh
= clip_bm
->bitmap
.rows
;
660 bs
= clip_bm
->bitmap
.pitch
;
662 // Calculate overlap coordinates
663 left
= (ax
> bx
) ? ax
: bx
;
664 top
= (ay
> by
) ? ay
: by
;
665 right
= ((ax
+ aw
) < (bx
+ bw
)) ? (ax
+ aw
) : (bx
+ bw
);
666 bottom
= ((ay
+ ah
) < (by
+ bh
)) ? (ay
+ ah
) : (by
+ bh
);
674 if (render_priv
->state
.clip_drawing_mode
) {
676 if (ax
+ aw
< bx
|| ay
+ ah
< by
|| ax
> bx
+ bw
||
681 // Allocate new buffer and add to free list
682 nbuffer
= malloc(as
* ah
);
683 if (!nbuffer
) goto blend_vector_exit
;
684 free_list_add(render_priv
, nbuffer
);
687 memcpy(nbuffer
, abuffer
, as
* (ah
- 1) + aw
);
688 for (y
= 0; y
< h
; y
++)
689 for (x
= 0; x
< w
; x
++) {
690 apos
= (atop
+ y
) * as
+ aleft
+ x
;
691 bpos
= (btop
+ y
) * bs
+ bleft
+ x
;
692 nbuffer
[apos
] = FFMAX(0, abuffer
[apos
] - bbuffer
[bpos
]);
696 if (ax
+ aw
< bx
|| ay
+ ah
< by
|| ax
> bx
+ bw
||
702 // Allocate new buffer and add to free list
703 nbuffer
= calloc(as
, ah
);
704 if (!nbuffer
) goto blend_vector_exit
;
705 free_list_add(render_priv
, nbuffer
);
708 for (y
= 0; y
< h
; y
++)
709 for (x
= 0; x
< w
; x
++) {
710 apos
= (atop
+ y
) * as
+ aleft
+ x
;
711 bpos
= (btop
+ y
) * bs
+ bleft
+ x
;
712 nbuffer
[apos
] = (abuffer
[apos
] * bbuffer
[bpos
] + 255) >> 8;
715 cur
->bitmap
= nbuffer
;
719 ass_drawing_free(render_priv
->state
.clip_drawing
);
720 render_priv
->state
.clip_drawing
= 0;
724 * \brief Convert TextInfo struct to ASS_Image list
725 * Splits glyphs in halves when needed (for \kf karaoke).
727 static ASS_Image
*render_text(ASS_Renderer
*render_priv
, int dst_x
, int dst_y
)
733 ASS_Image
**tail
= &head
;
734 ASS_Image
**last_tail
= 0;
735 ASS_Image
**here_tail
= 0;
736 TextInfo
*text_info
= &render_priv
->text_info
;
738 for (i
= 0; i
< text_info
->length
; ++i
) {
739 GlyphInfo
*info
= text_info
->glyphs
+ i
;
740 if ((info
->symbol
== 0) || (info
->symbol
== '\n') || !info
->bm_s
741 || (info
->shadow_x
== 0 && info
->shadow_y
== 0) || info
->skip
)
745 dst_x
+ (info
->pos
.x
>> 6) +
746 (int) (info
->shadow_x
* render_priv
->border_scale
);
748 dst_y
+ (info
->pos
.y
>> 6) +
749 (int) (info
->shadow_y
* render_priv
->border_scale
);
754 render_glyph(render_priv
, bm
, pen_x
, pen_y
, info
->c
[3], 0,
756 if (last_tail
&& tail
!= here_tail
&& ((info
->c
[3] & 0xff) > 0))
757 render_overlap(render_priv
, last_tail
, here_tail
);
759 last_tail
= here_tail
;
763 for (i
= 0; i
< text_info
->length
; ++i
) {
764 GlyphInfo
*info
= text_info
->glyphs
+ i
;
765 if ((info
->symbol
== 0) || (info
->symbol
== '\n') || !info
->bm_o
769 pen_x
= dst_x
+ (info
->pos
.x
>> 6);
770 pen_y
= dst_y
+ (info
->pos
.y
>> 6);
773 if ((info
->effect_type
== EF_KARAOKE_KO
)
774 && (info
->effect_timing
<= (info
->bbox
.xMax
>> 6))) {
779 render_glyph(render_priv
, bm
, pen_x
, pen_y
, info
->c
[2],
781 if (last_tail
&& tail
!= here_tail
&& ((info
->c
[2] & 0xff) > 0))
782 render_overlap(render_priv
, last_tail
, here_tail
);
784 last_tail
= here_tail
;
788 for (i
= 0; i
< text_info
->length
; ++i
) {
789 GlyphInfo
*info
= text_info
->glyphs
+ i
;
790 if ((info
->symbol
== 0) || (info
->symbol
== '\n') || !info
->bm
794 pen_x
= dst_x
+ (info
->pos
.x
>> 6);
795 pen_y
= dst_y
+ (info
->pos
.y
>> 6);
798 if ((info
->effect_type
== EF_KARAOKE
)
799 || (info
->effect_type
== EF_KARAOKE_KO
)) {
800 if (info
->effect_timing
> (info
->bbox
.xMax
>> 6))
802 render_glyph(render_priv
, bm
, pen_x
, pen_y
,
803 info
->c
[0], 0, 1000000, tail
);
806 render_glyph(render_priv
, bm
, pen_x
, pen_y
,
807 info
->c
[1], 0, 1000000, tail
);
808 } else if (info
->effect_type
== EF_KARAOKE_KF
) {
810 render_glyph(render_priv
, bm
, pen_x
, pen_y
, info
->c
[0],
811 info
->c
[1], info
->effect_timing
, tail
);
814 render_glyph(render_priv
, bm
, pen_x
, pen_y
, info
->c
[0],
819 blend_vector_clip(render_priv
, head
);
824 static void compute_string_bbox(TextInfo
*info
, DBBox
*bbox
)
828 if (info
->length
> 0) {
831 bbox
->yMin
= -1 * info
->lines
[0].asc
+ d6_to_double(info
->glyphs
[0].pos
.y
);
832 bbox
->yMax
= info
->height
- info
->lines
[0].asc
+
833 d6_to_double(info
->glyphs
[0].pos
.y
);
835 for (i
= 0; i
< info
->length
; ++i
) {
836 if (info
->glyphs
[i
].skip
) continue;
837 double s
= d6_to_double(info
->glyphs
[i
].pos
.x
);
838 double e
= s
+ d6_to_double(info
->glyphs
[i
].advance
.x
);
839 bbox
->xMin
= FFMIN(bbox
->xMin
, s
);
840 bbox
->xMax
= FFMAX(bbox
->xMax
, e
);
843 bbox
->xMin
= bbox
->xMax
= bbox
->yMin
= bbox
->yMax
= 0.;
847 * \brief partially reset render_context to style values
848 * Works like {\r}: resets some style overrides
850 void reset_render_context(ASS_Renderer
*render_priv
)
852 render_priv
->state
.c
[0] = render_priv
->state
.style
->PrimaryColour
;
853 render_priv
->state
.c
[1] = render_priv
->state
.style
->SecondaryColour
;
854 render_priv
->state
.c
[2] = render_priv
->state
.style
->OutlineColour
;
855 render_priv
->state
.c
[3] = render_priv
->state
.style
->BackColour
;
856 render_priv
->state
.flags
=
857 (render_priv
->state
.style
->Underline
? DECO_UNDERLINE
: 0) |
858 (render_priv
->state
.style
->StrikeOut
? DECO_STRIKETHROUGH
: 0);
859 render_priv
->state
.font_size
= render_priv
->state
.style
->FontSize
;
861 free(render_priv
->state
.family
);
862 render_priv
->state
.family
= NULL
;
863 render_priv
->state
.family
= strdup(render_priv
->state
.style
->FontName
);
864 render_priv
->state
.treat_family_as_pattern
=
865 render_priv
->state
.style
->treat_fontname_as_pattern
;
866 render_priv
->state
.bold
= render_priv
->state
.style
->Bold
;
867 render_priv
->state
.italic
= render_priv
->state
.style
->Italic
;
868 update_font(render_priv
);
870 change_border(render_priv
, -1., -1.);
871 render_priv
->state
.scale_x
= render_priv
->state
.style
->ScaleX
;
872 render_priv
->state
.scale_y
= render_priv
->state
.style
->ScaleY
;
873 render_priv
->state
.hspacing
= render_priv
->state
.style
->Spacing
;
874 render_priv
->state
.be
= 0;
875 render_priv
->state
.blur
= 0.0;
876 render_priv
->state
.shadow_x
= render_priv
->state
.style
->Shadow
;
877 render_priv
->state
.shadow_y
= render_priv
->state
.style
->Shadow
;
878 render_priv
->state
.frx
= render_priv
->state
.fry
= 0.;
879 render_priv
->state
.frz
= M_PI
* render_priv
->state
.style
->Angle
/ 180.;
880 render_priv
->state
.fax
= render_priv
->state
.fay
= 0.;
881 render_priv
->state
.wrap_style
= render_priv
->track
->WrapStyle
;
885 * \brief Start new event. Reset render_priv->state.
888 init_render_context(ASS_Renderer
*render_priv
, ASS_Event
*event
)
890 render_priv
->state
.event
= event
;
891 render_priv
->state
.style
= render_priv
->track
->styles
+ event
->Style
;
893 reset_render_context(render_priv
);
895 render_priv
->state
.evt_type
= EVENT_NORMAL
;
896 render_priv
->state
.alignment
= render_priv
->state
.style
->Alignment
;
897 render_priv
->state
.pos_x
= 0;
898 render_priv
->state
.pos_y
= 0;
899 render_priv
->state
.org_x
= 0;
900 render_priv
->state
.org_y
= 0;
901 render_priv
->state
.have_origin
= 0;
902 render_priv
->state
.clip_x0
= 0;
903 render_priv
->state
.clip_y0
= 0;
904 render_priv
->state
.clip_x1
= render_priv
->track
->PlayResX
;
905 render_priv
->state
.clip_y1
= render_priv
->track
->PlayResY
;
906 render_priv
->state
.clip_mode
= 0;
907 render_priv
->state
.detect_collisions
= 1;
908 render_priv
->state
.fade
= 0;
909 render_priv
->state
.drawing_mode
= 0;
910 render_priv
->state
.effect_type
= EF_NONE
;
911 render_priv
->state
.effect_timing
= 0;
912 render_priv
->state
.effect_skip_timing
= 0;
913 ass_drawing_free(render_priv
->state
.drawing
);
914 render_priv
->state
.drawing
= ass_drawing_new(render_priv
->fontconfig_priv
,
915 render_priv
->state
.font
,
916 render_priv
->ftlibrary
);
918 apply_transition_effects(render_priv
, event
);
921 static void free_render_context(ASS_Renderer
*render_priv
)
923 free(render_priv
->state
.family
);
924 ass_drawing_free(render_priv
->state
.drawing
);
926 render_priv
->state
.family
= NULL
;
927 render_priv
->state
.drawing
= NULL
;
931 * Replace the outline of a glyph by a contour which makes up a simple
934 static void draw_opaque_box(ASS_Renderer
*render_priv
, uint32_t ch
,
935 FT_Glyph glyph
, int sx
, int sy
)
937 int asc
= 0, desc
= 0;
939 int adv
= d16_to_d6(glyph
->advance
.x
);
940 double scale_y
= render_priv
->state
.scale_y
;
941 double scale_x
= render_priv
->state
.scale_x
;
942 FT_OutlineGlyph og
= (FT_OutlineGlyph
) glyph
;
950 asc
= render_priv
->state
.drawing
->asc
;
951 desc
= render_priv
->state
.drawing
->desc
;
953 ass_font_get_asc_desc(render_priv
->state
.font
, ch
, &asc
, &desc
);
958 // Emulate the WTFish behavior of VSFilter, i.e. double-scale
959 // the sizes of the opaque box.
960 adv
+= double_to_d6(render_priv
->state
.hspacing
* render_priv
->font_scale
966 desc
+= asc
* (scale_y
- 1.0);
968 FT_Vector points
[4] = {
969 { .x
= -sx
, .y
= asc
+ sy
},
970 { .x
= adv
+ sx
, .y
= asc
+ sy
},
971 { .x
= adv
+ sx
, .y
= -desc
- sy
},
972 { .x
= -sx
, .y
= -desc
- sy
},
975 FT_Outline_Done(render_priv
->ftlibrary
, &og
->outline
);
976 FT_Outline_New(render_priv
->ftlibrary
, 4, 1, &og
->outline
);
979 ol
->n_points
= ol
->n_contours
= 0;
980 for (i
= 0; i
< 4; i
++) {
981 ol
->points
[ol
->n_points
] = points
[i
];
982 ol
->tags
[ol
->n_points
++] = 1;
984 ol
->contours
[ol
->n_contours
++] = ol
->n_points
- 1;
988 * Stroke an outline glyph in x/y direction. Applies various fixups to get
989 * around limitations of the FreeType stroker.
991 static void stroke_outline_glyph(ASS_Renderer
*render_priv
,
992 FT_OutlineGlyph
*glyph
, int sx
, int sy
)
994 if (sx
<= 0 && sy
<= 0)
997 fix_freetype_stroker(*glyph
, sx
, sy
);
999 // Borders are equal; use the regular stroker
1000 if (sx
== sy
&& render_priv
->state
.stroker
) {
1002 error
= FT_Glyph_StrokeBorder((FT_Glyph
*) glyph
,
1003 render_priv
->state
.stroker
, 0, 1);
1005 ass_msg(render_priv
->library
, MSGL_WARN
,
1006 "FT_Glyph_Stroke error: %d", error
);
1008 // "Stroke" with the outline emboldener in two passes.
1009 // The outlines look uglier, but the emboldening never adds any points
1012 FT_Outline
*ol
= &(*glyph
)->outline
;
1014 FT_Outline_New(render_priv
->ftlibrary
, ol
->n_points
,
1015 ol
->n_contours
, &nol
);
1016 FT_Outline_Copy(ol
, &nol
);
1018 FT_Outline_Embolden(ol
, sx
* 2);
1019 FT_Outline_Translate(ol
, -sx
, -sx
);
1020 FT_Outline_Embolden(&nol
, sy
* 2);
1021 FT_Outline_Translate(&nol
, -sy
, -sy
);
1023 for (i
= 0; i
< ol
->n_points
; i
++)
1024 ol
->points
[i
].y
= nol
.points
[i
].y
;
1026 FT_Outline_Done(render_priv
->ftlibrary
, &nol
);
1031 * \brief Prepare glyph hash
1034 fill_glyph_hash(ASS_Renderer
*priv
, GlyphHashKey
*key
,
1035 ASS_Drawing
*drawing
, uint32_t ch
)
1037 if (drawing
->hash
) {
1038 key
->scale_x
= double_to_d16(priv
->state
.scale_x
);
1039 key
->scale_y
= double_to_d16(priv
->state
.scale_y
);
1040 key
->outline
.x
= priv
->state
.border_x
* 0xFFFF;
1041 key
->outline
.y
= priv
->state
.border_y
* 0xFFFF;
1042 key
->border_style
= priv
->state
.style
->BorderStyle
;
1043 key
->drawing_hash
= drawing
->hash
;
1044 // not very clean, but works
1045 key
->size
= drawing
->scale
;
1048 key
->font
= priv
->state
.font
;
1049 key
->size
= priv
->state
.font_size
;
1051 key
->bold
= priv
->state
.bold
;
1052 key
->italic
= priv
->state
.italic
;
1053 key
->scale_x
= double_to_d16(priv
->state
.scale_x
);
1054 key
->scale_y
= double_to_d16(priv
->state
.scale_y
);
1055 key
->outline
.x
= priv
->state
.border_x
* 0xFFFF;
1056 key
->outline
.y
= priv
->state
.border_y
* 0xFFFF;
1057 key
->flags
= priv
->state
.flags
;
1058 key
->border_style
= priv
->state
.style
->BorderStyle
;
1063 * \brief Get normal and outline (border) glyphs
1064 * \param symbol ucs4 char
1065 * \param info out: struct filled with extracted data
1066 * Tries to get both glyphs from cache.
1067 * If they can't be found, gets a glyph from font face, generates outline with FT_Stroker,
1068 * and add them to cache.
1069 * The glyphs are returned in info->glyph and info->outline_glyph
1072 get_outline_glyph(ASS_Renderer
*render_priv
, int symbol
, GlyphInfo
*info
,
1073 ASS_Drawing
*drawing
)
1075 GlyphHashValue
*val
;
1078 memset(&key
, 0, sizeof(key
));
1079 memset(info
, 0, sizeof(GlyphInfo
));
1081 fill_glyph_hash(render_priv
, &key
, drawing
, symbol
);
1082 val
= cache_find_glyph(render_priv
->cache
.glyph_cache
, &key
);
1084 info
->glyph
= val
->glyph
;
1085 info
->outline_glyph
= val
->outline_glyph
;
1086 info
->bbox
= val
->bbox_scaled
;
1087 info
->advance
.x
= val
->advance
.x
;
1088 info
->advance
.y
= val
->advance
.y
;
1089 if (drawing
->hash
) {
1090 drawing
->asc
= val
->asc
;
1091 drawing
->desc
= val
->desc
;
1095 if (drawing
->hash
) {
1096 if(!ass_drawing_parse(drawing
, 0))
1098 info
->glyph
= (FT_Glyph
) drawing
->glyph
;
1101 ass_font_get_glyph(render_priv
->fontconfig_priv
,
1102 render_priv
->state
.font
, symbol
,
1103 render_priv
->settings
.hinting
,
1104 render_priv
->state
.flags
);
1109 info
->advance
.x
= d16_to_d6(info
->glyph
->advance
.x
);
1110 info
->advance
.y
= d16_to_d6(info
->glyph
->advance
.y
);
1111 FT_Glyph_Get_CBox(info
->glyph
, FT_GLYPH_BBOX_SUBPIXELS
, &info
->bbox
);
1113 if (render_priv
->state
.style
->BorderStyle
== 3 &&
1114 (render_priv
->state
.border_x
> 0||
1115 render_priv
->state
.border_y
> 0)) {
1116 FT_Glyph_Copy(info
->glyph
, &info
->outline_glyph
);
1117 draw_opaque_box(render_priv
, symbol
, info
->outline_glyph
,
1118 double_to_d6(render_priv
->state
.border_x
*
1119 render_priv
->border_scale
),
1120 double_to_d6(render_priv
->state
.border_y
*
1121 render_priv
->border_scale
));
1122 } else if ((render_priv
->state
.border_x
> 0
1123 || render_priv
->state
.border_y
> 0)
1124 && key
.scale_x
&& key
.scale_y
) {
1126 FT_Glyph_Copy(info
->glyph
, &info
->outline_glyph
);
1127 stroke_outline_glyph(render_priv
,
1128 (FT_OutlineGlyph
*) &info
->outline_glyph
,
1129 double_to_d6(render_priv
->state
.border_x
*
1130 render_priv
->border_scale
),
1131 double_to_d6(render_priv
->state
.border_y
*
1132 render_priv
->border_scale
));
1135 memset(&v
, 0, sizeof(v
));
1136 v
.glyph
= info
->glyph
;
1137 v
.outline_glyph
= info
->outline_glyph
;
1138 v
.advance
= info
->advance
;
1139 v
.bbox_scaled
= info
->bbox
;
1140 if (drawing
->hash
) {
1141 v
.asc
= drawing
->asc
;
1142 v
.desc
= drawing
->desc
;
1144 cache_add_glyph(render_priv
->cache
.glyph_cache
, &key
, &v
);
1149 * \brief Apply transformation to outline points of a glyph
1150 * Applies rotations given by frx, fry and frz and projects the points back
1151 * onto the screen plane.
1154 transform_3d_points(FT_Vector shift
, FT_Glyph glyph
, double frx
, double fry
,
1155 double frz
, double fax
, double fay
, double scale
,
1158 double sx
= sin(frx
);
1159 double sy
= sin(fry
);
1160 double sz
= sin(frz
);
1161 double cx
= cos(frx
);
1162 double cy
= cos(fry
);
1163 double cz
= cos(frz
);
1164 FT_Outline
*outline
= &((FT_OutlineGlyph
) glyph
)->outline
;
1165 FT_Vector
*p
= outline
->points
;
1166 double x
, y
, z
, xx
, yy
, zz
;
1169 dist
= 20000 * scale
;
1170 for (i
= 0; i
< outline
->n_points
; i
++) {
1171 x
= (double) p
[i
].x
+ shift
.x
+ (fax
* (yshift
- p
[i
].y
));
1172 y
= (double) p
[i
].y
+ shift
.y
+ (-fay
* p
[i
].x
);
1175 xx
= x
* cz
+ y
* sz
;
1176 yy
= -(x
* sz
- y
* cz
);
1180 y
= yy
* cx
+ zz
* sx
;
1181 z
= yy
* sx
- zz
* cx
;
1183 xx
= x
* cy
+ z
* sy
;
1185 zz
= x
* sy
- z
* cy
;
1187 zz
= FFMAX(zz
, 1000 - dist
);
1189 x
= (xx
* dist
) / (zz
+ dist
);
1190 y
= (yy
* dist
) / (zz
+ dist
);
1191 p
[i
].x
= x
- shift
.x
+ 0.5;
1192 p
[i
].y
= y
- shift
.y
+ 0.5;
1197 * \brief Apply 3d transformation to several objects
1198 * \param shift FreeType vector
1199 * \param glyph FreeType glyph
1200 * \param glyph2 FreeType glyph
1201 * \param frx x-axis rotation angle
1202 * \param fry y-axis rotation angle
1203 * \param frz z-axis rotation angle
1204 * Rotates both glyphs by frx, fry and frz. Shift vector is added before rotation and subtracted after it.
1207 transform_3d(FT_Vector shift
, FT_Glyph
*glyph
, FT_Glyph
*glyph2
,
1208 double frx
, double fry
, double frz
, double fax
, double fay
,
1209 double scale
, int yshift
)
1213 if (frx
!= 0. || fry
!= 0. || frz
!= 0. || fax
!= 0. || fay
!= 0.) {
1214 if (glyph
&& *glyph
)
1215 transform_3d_points(shift
, *glyph
, frx
, fry
, frz
,
1216 fax
, fay
, scale
, yshift
);
1218 if (glyph2
&& *glyph2
)
1219 transform_3d_points(shift
, *glyph2
, frx
, fry
, frz
,
1220 fax
, fay
, scale
, yshift
);
1225 * \brief Get bitmaps for a glyph
1226 * \param info glyph info
1227 * Tries to get glyph bitmaps from bitmap cache.
1228 * If they can't be found, they are generated by rotating and rendering the glyph.
1229 * After that, bitmaps are added to the cache.
1230 * They are returned in info->bm (glyph), info->bm_o (outline) and info->bm_s (shadow).
1233 get_bitmap_glyph(ASS_Renderer
*render_priv
, GlyphInfo
*info
)
1235 BitmapHashValue
*val
;
1236 BitmapHashKey
*key
= &info
->hash_key
;
1238 val
= cache_find_bitmap(render_priv
->cache
.bitmap_cache
, key
);
1242 info
->bm_o
= val
->bm_o
;
1243 info
->bm_s
= val
->bm_s
;
1246 BitmapHashValue hash_val
;
1248 double fax_scaled
, fay_scaled
;
1249 info
->bm
= info
->bm_o
= info
->bm_s
= 0;
1250 if (info
->glyph
&& info
->symbol
!= '\n' && info
->symbol
!= 0
1254 double scale_x
= render_priv
->font_scale_x
;
1256 FT_Glyph_Copy(info
->glyph
, &glyph
);
1257 FT_Glyph_Copy(info
->outline_glyph
, &outline
);
1258 // calculating rotation shift vector (from rotation origin to the glyph basepoint)
1259 shift
.x
= key
->shift_x
;
1260 shift
.y
= key
->shift_y
;
1261 fax_scaled
= info
->fax
*
1262 render_priv
->state
.scale_x
;
1263 fay_scaled
= info
->fay
* render_priv
->state
.scale_y
;
1265 transform_3d(shift
, &glyph
, &outline
,
1266 info
->frx
, info
->fry
, info
->frz
, fax_scaled
,
1267 fay_scaled
, render_priv
->font_scale
, info
->asc
);
1269 // PAR correction scaling
1270 FT_Matrix m
= { double_to_d16(scale_x
), 0,
1271 0, double_to_d16(1.0) };
1275 FT_Outline
*outl
= &((FT_OutlineGlyph
) glyph
)->outline
;
1277 FT_Outline_Transform(outl
, &m
);
1278 FT_Outline_Translate(outl
, key
->advance
.x
, -key
->advance
.y
);
1281 FT_Outline
*outl
= &((FT_OutlineGlyph
) outline
)->outline
;
1283 FT_Outline_Transform(outl
, &m
);
1284 FT_Outline_Translate(outl
, key
->advance
.x
, -key
->advance
.y
);
1287 error
= glyph_to_bitmap(render_priv
->library
,
1288 render_priv
->synth_priv
,
1290 &info
->bm
, &info
->bm_o
,
1291 &info
->bm_s
, info
->be
,
1292 info
->blur
* render_priv
->border_scale
,
1293 key
->shadow_offset
, key
->border_style
);
1297 // add bitmaps to cache
1298 hash_val
.bm_o
= info
->bm_o
;
1299 hash_val
.bm
= info
->bm
;
1300 hash_val
.bm_s
= info
->bm_s
;
1301 cache_add_bitmap(render_priv
->cache
.bitmap_cache
, key
, &hash_val
);
1303 FT_Done_Glyph(glyph
);
1304 FT_Done_Glyph(outline
);
1310 * This function goes through text_info and calculates text parameters.
1311 * The following text_info fields are filled:
1317 static void measure_text(ASS_Renderer
*render_priv
)
1319 TextInfo
*text_info
= &render_priv
->text_info
;
1321 double max_asc
= 0., max_desc
= 0.;
1322 GlyphInfo
*last
= NULL
;
1325 text_info
->height
= 0.;
1326 for (i
= 0; i
< text_info
->length
+ 1; ++i
) {
1327 if ((i
== text_info
->length
) || text_info
->glyphs
[i
].linebreak
) {
1328 if (empty_line
&& cur_line
> 0 && last
&& i
< text_info
->length
) {
1329 max_asc
= d6_to_double(last
->asc
) / 2.0;
1330 max_desc
= d6_to_double(last
->desc
) / 2.0;
1332 text_info
->lines
[cur_line
].asc
= max_asc
;
1333 text_info
->lines
[cur_line
].desc
= max_desc
;
1334 text_info
->height
+= max_asc
+ max_desc
;
1336 max_asc
= max_desc
= 0.;
1340 if (i
< text_info
->length
) {
1341 GlyphInfo
*cur
= text_info
->glyphs
+ i
;
1342 if (d6_to_double(cur
->asc
) > max_asc
)
1343 max_asc
= d6_to_double(cur
->asc
);
1344 if (d6_to_double(cur
->desc
) > max_desc
)
1345 max_desc
= d6_to_double(cur
->desc
);
1346 if (cur
->symbol
!= '\n' && cur
->symbol
!= 0)
1350 text_info
->height
+=
1351 (text_info
->n_lines
-
1352 1) * render_priv
->settings
.line_spacing
;
1356 * Mark extra whitespace for later removal.
1358 #define IS_WHITESPACE(x) ((x->symbol == ' ' || x->symbol == '\n') \
1360 static void trim_whitespace(ASS_Renderer
*render_priv
)
1364 TextInfo
*ti
= &render_priv
->text_info
;
1366 // Mark trailing spaces
1368 cur
= ti
->glyphs
+ i
;
1369 while (i
&& IS_WHITESPACE(cur
)) {
1371 cur
= ti
->glyphs
+ --i
;
1374 // Mark leading whitespace
1377 while (i
< ti
->length
&& IS_WHITESPACE(cur
)) {
1379 cur
= ti
->glyphs
+ ++i
;
1382 // Mark all extraneous whitespace inbetween
1383 for (i
= 0; i
< ti
->length
; ++i
) {
1384 cur
= ti
->glyphs
+ i
;
1385 if (cur
->linebreak
) {
1386 // Mark whitespace before
1388 cur
= ti
->glyphs
+ j
;
1389 while (j
&& IS_WHITESPACE(cur
)) {
1391 cur
= ti
->glyphs
+ --j
;
1393 // A break itself can contain a whitespace, too
1394 cur
= ti
->glyphs
+ i
;
1395 if (cur
->symbol
== ' ')
1397 // Mark whitespace after
1399 cur
= ti
->glyphs
+ j
;
1400 while (j
< ti
->length
&& IS_WHITESPACE(cur
)) {
1402 cur
= ti
->glyphs
+ ++j
;
1408 #undef IS_WHITESPACE
1411 * \brief rearrange text between lines
1412 * \param max_text_width maximal text line width in pixels
1413 * The algo is similar to the one in libvo/sub.c:
1414 * 1. Place text, wrapping it when current line is full
1415 * 2. Try moving words from the end of a line to the beginning of the next one while it reduces
1416 * the difference in lengths between this two lines.
1417 * The result may not be optimal, but usually is good enough.
1419 * FIXME: implement style 0 and 3 correctly
1422 wrap_lines_smart(ASS_Renderer
*render_priv
, double max_text_width
)
1425 GlyphInfo
*cur
, *s1
, *e1
, *s2
, *s3
, *w
;
1432 TextInfo
*text_info
= &render_priv
->text_info
;
1435 text_info
->n_lines
= 1;
1437 s1
= text_info
->glyphs
; // current line start
1438 for (i
= 0; i
< text_info
->length
; ++i
) {
1440 double s_offset
, len
;
1441 cur
= text_info
->glyphs
+ i
;
1443 s_offset
= d6_to_double(s1
->bbox
.xMin
+ s1
->pos
.x
);
1444 len
= d6_to_double(cur
->bbox
.xMax
+ cur
->pos
.x
) - s_offset
;
1446 if (cur
->symbol
== '\n') {
1449 ass_msg(render_priv
->library
, MSGL_DBG2
,
1450 "forced line break at %d", break_at
);
1453 if ((len
>= max_text_width
)
1454 && (render_priv
->state
.wrap_style
!= 2)) {
1456 break_at
= last_space
;
1458 ass_msg(render_priv
->library
, MSGL_DBG2
, "line break at %d",
1462 if (break_at
!= -1) {
1463 // need to use one more line
1464 // marking break_at+1 as start of a new line
1465 int lead
= break_at
+ 1; // the first symbol of the new line
1466 if (text_info
->n_lines
>= text_info
->max_lines
) {
1467 // Raise maximum number of lines
1468 text_info
->max_lines
*= 2;
1469 text_info
->lines
= realloc(text_info
->lines
,
1471 text_info
->max_lines
);
1473 if (lead
< text_info
->length
)
1474 text_info
->glyphs
[lead
].linebreak
= break_type
;
1476 s1
= text_info
->glyphs
+ lead
;
1477 s_offset
= d6_to_double(s1
->bbox
.xMin
+ s1
->pos
.x
);
1478 text_info
->n_lines
++;
1481 if (cur
->symbol
== ' ')
1484 // make sure the hard linebreak is not forgotten when
1485 // there was a new soft linebreak just inserted
1486 if (cur
->symbol
== '\n' && break_type
== 1)
1489 #define DIFF(x,y) (((x) < (y)) ? (y - x) : (x - y))
1491 while (!exit
&& render_priv
->state
.wrap_style
!= 1) {
1493 w
= s3
= text_info
->glyphs
;
1495 for (i
= 0; i
<= text_info
->length
; ++i
) {
1496 cur
= text_info
->glyphs
+ i
;
1497 if ((i
== text_info
->length
) || cur
->linebreak
) {
1501 if (s1
&& (s2
->linebreak
== 1)) { // have at least 2 lines, and linebreak is 'soft'
1502 double l1
, l2
, l1_new
, l2_new
;
1507 } while ((w
> s1
) && (w
->symbol
== ' '));
1508 while ((w
> s1
) && (w
->symbol
!= ' ')) {
1512 while ((e1
> s1
) && (e1
->symbol
== ' ')) {
1515 if (w
->symbol
== ' ')
1518 l1
= d6_to_double(((s2
- 1)->bbox
.xMax
+ (s2
- 1)->pos
.x
) -
1519 (s1
->bbox
.xMin
+ s1
->pos
.x
));
1520 l2
= d6_to_double(((s3
- 1)->bbox
.xMax
+ (s3
- 1)->pos
.x
) -
1521 (s2
->bbox
.xMin
+ s2
->pos
.x
));
1522 l1_new
= d6_to_double(
1523 (e1
->bbox
.xMax
+ e1
->pos
.x
) -
1524 (s1
->bbox
.xMin
+ s1
->pos
.x
));
1525 l2_new
= d6_to_double(
1526 ((s3
- 1)->bbox
.xMax
+ (s3
- 1)->pos
.x
) -
1527 (w
->bbox
.xMin
+ w
->pos
.x
));
1529 if (DIFF(l1_new
, l2_new
) < DIFF(l1
, l2
)) {
1536 if (i
== text_info
->length
)
1541 assert(text_info
->n_lines
>= 1);
1544 measure_text(render_priv
);
1545 trim_whitespace(render_priv
);
1552 cur
= text_info
->glyphs
+ i
;
1553 while (i
< text_info
->length
&& cur
->skip
)
1554 cur
= text_info
->glyphs
+ ++i
;
1555 pen_shift_x
= d6_to_double(-cur
->pos
.x
);
1557 for (i
= 0; i
< text_info
->length
; ++i
) {
1558 cur
= text_info
->glyphs
+ i
;
1559 if (cur
->linebreak
) {
1560 while (i
< text_info
->length
&& cur
->skip
&& cur
->symbol
!= '\n')
1561 cur
= text_info
->glyphs
+ ++i
;
1563 text_info
->lines
[cur_line
- 1].desc
+
1564 text_info
->lines
[cur_line
].asc
;
1566 pen_shift_x
= d6_to_double(-cur
->pos
.x
);
1567 pen_shift_y
+= height
+ render_priv
->settings
.line_spacing
;
1568 ass_msg(render_priv
->library
, MSGL_DBG2
,
1569 "shifting from %d to %d by (%f, %f)", i
,
1570 text_info
->length
- 1, pen_shift_x
, pen_shift_y
);
1572 cur
->pos
.x
+= double_to_d6(pen_shift_x
);
1573 cur
->pos
.y
+= double_to_d6(pen_shift_y
);
1578 * \brief determine karaoke effects
1579 * Karaoke effects cannot be calculated during parse stage (get_next_char()),
1580 * so they are done in a separate step.
1581 * Parse stage: when karaoke style override is found, its parameters are stored in the next glyph's
1582 * (the first glyph of the karaoke word)'s effect_type and effect_timing.
1584 * 1. sets effect_type for all glyphs in the word (_karaoke_ word)
1585 * 2. sets effect_timing for all glyphs to x coordinate of the border line between the left and right karaoke parts
1586 * (left part is filled with PrimaryColour, right one - with SecondaryColour).
1588 static void process_karaoke_effects(ASS_Renderer
*render_priv
)
1590 GlyphInfo
*cur
, *cur2
;
1591 GlyphInfo
*s1
, *e1
; // start and end of the current word
1592 GlyphInfo
*s2
; // start of the next word
1594 int timing
; // current timing
1595 int tm_start
, tm_end
; // timings at start and end of the current word
1601 tm_current
= render_priv
->time
- render_priv
->state
.event
->Start
;
1604 for (i
= 0; i
<= render_priv
->text_info
.length
; ++i
) {
1605 cur
= render_priv
->text_info
.glyphs
+ i
;
1606 if ((i
== render_priv
->text_info
.length
)
1607 || (cur
->effect_type
!= EF_NONE
)) {
1612 tm_start
= timing
+ s1
->effect_skip_timing
;
1613 tm_end
= tm_start
+ s1
->effect_timing
;
1617 for (cur2
= s1
; cur2
<= e1
; ++cur2
) {
1618 x_start
= FFMIN(x_start
, d6_to_int(cur2
->bbox
.xMin
+ cur2
->pos
.x
));
1619 x_end
= FFMAX(x_end
, d6_to_int(cur2
->bbox
.xMax
+ cur2
->pos
.x
));
1622 dt
= (tm_current
- tm_start
);
1623 if ((s1
->effect_type
== EF_KARAOKE
)
1624 || (s1
->effect_type
== EF_KARAOKE_KO
)) {
1629 } else if (s1
->effect_type
== EF_KARAOKE_KF
) {
1630 dt
/= (tm_end
- tm_start
);
1631 x
= x_start
+ (x_end
- x_start
) * dt
;
1633 ass_msg(render_priv
->library
, MSGL_ERR
,
1634 "Unknown effect type");
1638 for (cur2
= s1
; cur2
<= e1
; ++cur2
) {
1639 cur2
->effect_type
= s1
->effect_type
;
1640 cur2
->effect_timing
= x
- d6_to_int(cur2
->pos
.x
);
1648 * \brief Calculate base point for positioning and rotation
1649 * \param bbox text bbox
1650 * \param alignment alignment
1651 * \param bx, by out: base point coordinates
1653 static void get_base_point(DBBox
*bbox
, int alignment
, double *bx
, double *by
)
1655 const int halign
= alignment
& 3;
1656 const int valign
= alignment
& 12;
1663 *bx
= (bbox
->xMax
+ bbox
->xMin
) / 2.0;
1675 *by
= (bbox
->yMax
+ bbox
->yMin
) / 2.0;
1684 * Prepare bitmap hash key of a glyph
1687 fill_bitmap_hash(ASS_Renderer
*priv
, BitmapHashKey
*hash_key
,
1688 ASS_Drawing
*drawing
, FT_Vector pen
, uint32_t code
)
1690 if (!drawing
->hash
) {
1691 hash_key
->font
= priv
->state
.font
;
1692 hash_key
->size
= priv
->state
.font_size
;
1693 hash_key
->bold
= priv
->state
.bold
;
1694 hash_key
->italic
= priv
->state
.italic
;
1696 hash_key
->drawing_hash
= drawing
->hash
;
1697 hash_key
->size
= drawing
->scale
;
1699 hash_key
->ch
= code
;
1700 hash_key
->outline
.x
= double_to_d16(priv
->state
.border_x
);
1701 hash_key
->outline
.y
= double_to_d16(priv
->state
.border_y
);
1702 hash_key
->scale_x
= double_to_d16(priv
->state
.scale_x
);
1703 hash_key
->scale_y
= double_to_d16(priv
->state
.scale_y
);
1704 hash_key
->frx
= rot_key(priv
->state
.frx
);
1705 hash_key
->fry
= rot_key(priv
->state
.fry
);
1706 hash_key
->frz
= rot_key(priv
->state
.frz
);
1707 hash_key
->fax
= double_to_d16(priv
->state
.fax
);
1708 hash_key
->fay
= double_to_d16(priv
->state
.fay
);
1709 hash_key
->be
= priv
->state
.be
;
1710 hash_key
->blur
= priv
->state
.blur
;
1711 hash_key
->border_style
= priv
->state
.style
->BorderStyle
;
1712 hash_key
->shadow_offset
.x
= double_to_d6(
1713 priv
->state
.shadow_x
* priv
->border_scale
-
1714 (int) (priv
->state
.shadow_x
* priv
->border_scale
));
1715 hash_key
->shadow_offset
.y
= double_to_d6(
1716 priv
->state
.shadow_y
* priv
->border_scale
-
1717 (int) (priv
->state
.shadow_y
* priv
->border_scale
));
1718 hash_key
->flags
= priv
->state
.flags
;
1722 * \brief Main ass rendering function, glues everything together
1723 * \param event event to render
1724 * \param event_images struct containing resulting images, will also be initialized
1725 * Process event, appending resulting ASS_Image's to images_root.
1728 ass_render_event(ASS_Renderer
*render_priv
, ASS_Event
*event
,
1729 EventImages
*event_images
)
1738 int MarginL
, MarginR
, MarginV
;
1740 int alignment
, halign
, valign
;
1741 int kern
= render_priv
->track
->Kerning
;
1742 double device_x
= 0;
1743 double device_y
= 0;
1744 TextInfo
*text_info
= &render_priv
->text_info
;
1745 GlyphInfo
*glyphs
= render_priv
->text_info
.glyphs
;
1746 ASS_Drawing
*drawing
;
1748 if (event
->Style
>= render_priv
->track
->n_styles
) {
1749 ass_msg(render_priv
->library
, MSGL_WARN
, "No style found");
1753 ass_msg(render_priv
->library
, MSGL_WARN
, "Empty event");
1757 init_render_context(render_priv
, event
);
1759 drawing
= render_priv
->state
.drawing
;
1760 text_info
->length
= 0;
1768 // get next char, executing style override
1769 // this affects render_context
1771 code
= get_next_char(render_priv
, &p
);
1772 if (render_priv
->state
.drawing_mode
&& code
)
1773 ass_drawing_add_char(drawing
, (char) code
);
1774 } while (code
&& render_priv
->state
.drawing_mode
); // skip everything in drawing mode
1778 drawing
->scale_x
= render_priv
->state
.scale_x
*
1779 render_priv
->font_scale
;
1780 drawing
->scale_y
= render_priv
->state
.scale_y
*
1781 render_priv
->font_scale
;
1782 ass_drawing_hash(drawing
);
1787 // face could have been changed in get_next_char
1788 if (!render_priv
->state
.font
) {
1789 free_render_context(render_priv
);
1796 if (text_info
->length
>= text_info
->max_glyphs
) {
1797 // Raise maximum number of glyphs
1798 text_info
->max_glyphs
*= 2;
1799 text_info
->glyphs
= glyphs
=
1800 realloc(text_info
->glyphs
,
1801 sizeof(GlyphInfo
) * text_info
->max_glyphs
);
1804 // Add kerning to pen
1805 if (kern
&& previous
&& code
&& !drawing
->hash
) {
1808 ass_font_get_kerning(render_priv
->state
.font
, previous
,
1810 pen
.x
+= delta
.x
* render_priv
->state
.scale_x
;
1811 pen
.y
+= delta
.y
* render_priv
->state
.scale_y
;
1814 ass_font_set_transform(render_priv
->state
.font
,
1815 render_priv
->state
.scale_x
,
1816 render_priv
->state
.scale_y
, NULL
);
1818 get_outline_glyph(render_priv
, code
,
1819 glyphs
+ text_info
->length
, drawing
);
1821 // Add additional space after italic to non-italic style changes
1822 if (text_info
->length
&&
1823 glyphs
[text_info
->length
- 1].hash_key
.italic
&&
1824 !render_priv
->state
.italic
) {
1825 int back
= text_info
->length
- 1;
1826 GlyphInfo
*og
= &glyphs
[back
];
1827 while (back
&& og
->bbox
.xMax
- og
->bbox
.xMin
== 0
1828 && og
->hash_key
.italic
)
1829 og
= &glyphs
[--back
];
1830 if (og
->bbox
.xMax
> og
->advance
.x
) {
1831 // The FreeType oblique slants by 6/16
1832 pen
.x
+= og
->bbox
.yMax
* 0.375;
1836 glyphs
[text_info
->length
].pos
.x
= pen
.x
;
1837 glyphs
[text_info
->length
].pos
.y
= pen
.y
;
1839 pen
.x
+= glyphs
[text_info
->length
].advance
.x
;
1840 pen
.x
+= double_to_d6(render_priv
->state
.hspacing
*
1841 render_priv
->font_scale
1842 * render_priv
->state
.scale_x
);
1843 pen
.y
+= glyphs
[text_info
->length
].advance
.y
;
1844 pen
.y
+= (render_priv
->state
.fay
* render_priv
->state
.scale_y
) *
1845 glyphs
[text_info
->length
].advance
.x
;
1849 glyphs
[text_info
->length
].symbol
= code
;
1850 glyphs
[text_info
->length
].linebreak
= 0;
1851 for (i
= 0; i
< 4; ++i
) {
1852 uint32_t clr
= render_priv
->state
.c
[i
];
1854 mult_alpha(_a(clr
), render_priv
->state
.fade
), 1.);
1855 glyphs
[text_info
->length
].c
[i
] = clr
;
1857 glyphs
[text_info
->length
].effect_type
= render_priv
->state
.effect_type
;
1858 glyphs
[text_info
->length
].effect_timing
=
1859 render_priv
->state
.effect_timing
;
1860 glyphs
[text_info
->length
].effect_skip_timing
=
1861 render_priv
->state
.effect_skip_timing
;
1862 glyphs
[text_info
->length
].be
= render_priv
->state
.be
;
1863 glyphs
[text_info
->length
].blur
= render_priv
->state
.blur
;
1864 glyphs
[text_info
->length
].shadow_x
= render_priv
->state
.shadow_x
;
1865 glyphs
[text_info
->length
].shadow_y
= render_priv
->state
.shadow_y
;
1866 glyphs
[text_info
->length
].frx
= render_priv
->state
.frx
;
1867 glyphs
[text_info
->length
].fry
= render_priv
->state
.fry
;
1868 glyphs
[text_info
->length
].frz
= render_priv
->state
.frz
;
1869 glyphs
[text_info
->length
].fax
= render_priv
->state
.fax
;
1870 glyphs
[text_info
->length
].fay
= render_priv
->state
.fay
;
1871 if (drawing
->hash
) {
1872 glyphs
[text_info
->length
].asc
= drawing
->asc
;
1873 glyphs
[text_info
->length
].desc
= drawing
->desc
;
1875 ass_font_get_asc_desc(render_priv
->state
.font
, code
,
1876 &glyphs
[text_info
->length
].asc
,
1877 &glyphs
[text_info
->length
].desc
);
1879 glyphs
[text_info
->length
].asc
*= render_priv
->state
.scale_y
;
1880 glyphs
[text_info
->length
].desc
*= render_priv
->state
.scale_y
;
1884 fill_bitmap_hash(render_priv
, &glyphs
[text_info
->length
].hash_key
,
1885 drawing
, pen
, code
);
1887 text_info
->length
++;
1889 render_priv
->state
.effect_type
= EF_NONE
;
1890 render_priv
->state
.effect_timing
= 0;
1891 render_priv
->state
.effect_skip_timing
= 0;
1893 if (drawing
->hash
) {
1894 ass_drawing_free(drawing
);
1895 drawing
= render_priv
->state
.drawing
=
1896 ass_drawing_new(render_priv
->fontconfig_priv
,
1897 render_priv
->state
.font
,
1898 render_priv
->ftlibrary
);
1903 if (text_info
->length
== 0) {
1904 // no valid symbols in the event; this can be smth like {comment}
1905 free_render_context(render_priv
);
1909 // depends on glyph x coordinates being monotonous, so it should be done before line wrap
1910 process_karaoke_effects(render_priv
);
1913 alignment
= render_priv
->state
.alignment
;
1914 halign
= alignment
& 3;
1915 valign
= alignment
& 12;
1918 (event
->MarginL
) ? event
->MarginL
: render_priv
->state
.style
->MarginL
;
1920 (event
->MarginR
) ? event
->MarginR
: render_priv
->state
.style
->MarginR
;
1922 (event
->MarginV
) ? event
->MarginV
: render_priv
->state
.style
->MarginV
;
1924 if (render_priv
->state
.evt_type
!= EVENT_HSCROLL
) {
1925 double max_text_width
;
1927 // calculate max length of a line
1930 render_priv
->track
->PlayResX
- MarginR
) -
1931 x2scr(render_priv
, MarginL
);
1933 // rearrange text in several lines
1934 wrap_lines_smart(render_priv
, max_text_width
);
1938 for (i
= 1; i
< text_info
->length
+ 1; ++i
) { // (text_info->length + 1) is the end of the last line
1939 if ((i
== text_info
->length
)
1940 || glyphs
[i
].linebreak
) {
1941 double width
, shift
= 0;
1942 GlyphInfo
*first_glyph
=
1943 glyphs
+ last_break
+ 1;
1944 GlyphInfo
*last_glyph
= glyphs
+ i
- 1;
1946 while (first_glyph
< last_glyph
&& first_glyph
->skip
)
1949 while ((last_glyph
> first_glyph
)
1950 && ((last_glyph
->symbol
== '\n')
1951 || (last_glyph
->symbol
== 0)
1952 || (last_glyph
->skip
)))
1955 width
= d6_to_double(
1956 last_glyph
->pos
.x
+ last_glyph
->advance
.x
-
1957 first_glyph
->pos
.x
);
1958 if (halign
== HALIGN_LEFT
) { // left aligned, no action
1960 } else if (halign
== HALIGN_RIGHT
) { // right aligned
1961 shift
= max_text_width
- width
;
1962 } else if (halign
== HALIGN_CENTER
) { // centered
1963 shift
= (max_text_width
- width
) / 2.0;
1965 for (j
= last_break
+ 1; j
< i
; ++j
) {
1966 glyphs
[j
].pos
.x
+= double_to_d6(shift
);
1971 } else { // render_priv->state.evt_type == EVENT_HSCROLL
1972 measure_text(render_priv
);
1975 // determing text bounding box
1976 compute_string_bbox(text_info
, &bbox
);
1978 // determine device coordinates for text
1980 // x coordinate for everything except positioned events
1981 if (render_priv
->state
.evt_type
== EVENT_NORMAL
||
1982 render_priv
->state
.evt_type
== EVENT_VSCROLL
) {
1983 device_x
= x2scr(render_priv
, MarginL
);
1984 } else if (render_priv
->state
.evt_type
== EVENT_HSCROLL
) {
1985 if (render_priv
->state
.scroll_direction
== SCROLL_RL
)
1988 render_priv
->track
->PlayResX
-
1989 render_priv
->state
.scroll_shift
);
1990 else if (render_priv
->state
.scroll_direction
== SCROLL_LR
)
1993 render_priv
->state
.scroll_shift
) - (bbox
.xMax
-
1997 // y coordinate for everything except positioned events
1998 if (render_priv
->state
.evt_type
== EVENT_NORMAL
||
1999 render_priv
->state
.evt_type
== EVENT_HSCROLL
) {
2000 if (valign
== VALIGN_TOP
) { // toptitle
2002 y2scr_top(render_priv
,
2003 MarginV
) + text_info
->lines
[0].asc
;
2004 } else if (valign
== VALIGN_CENTER
) { // midtitle
2006 y2scr(render_priv
, render_priv
->track
->PlayResY
/ 2.0);
2007 device_y
= scr_y
- (bbox
.yMax
+ bbox
.yMin
) / 2.0;
2008 } else { // subtitle
2010 if (valign
!= VALIGN_SUB
)
2011 ass_msg(render_priv
->library
, MSGL_V
,
2012 "Invalid valign, assuming 0 (subtitle)");
2014 y2scr_sub(render_priv
,
2015 render_priv
->track
->PlayResY
- MarginV
);
2017 device_y
-= text_info
->height
;
2018 device_y
+= text_info
->lines
[0].asc
;
2020 } else if (render_priv
->state
.evt_type
== EVENT_VSCROLL
) {
2021 if (render_priv
->state
.scroll_direction
== SCROLL_TB
)
2024 render_priv
->state
.clip_y0
+
2025 render_priv
->state
.scroll_shift
) - (bbox
.yMax
-
2027 else if (render_priv
->state
.scroll_direction
== SCROLL_BT
)
2030 render_priv
->state
.clip_y1
-
2031 render_priv
->state
.scroll_shift
);
2034 // positioned events are totally different
2035 if (render_priv
->state
.evt_type
== EVENT_POSITIONED
) {
2038 ass_msg(render_priv
->library
, MSGL_DBG2
, "positioned event at %f, %f",
2039 render_priv
->state
.pos_x
, render_priv
->state
.pos_y
);
2040 get_base_point(&bbox
, alignment
, &base_x
, &base_y
);
2042 x2scr_pos(render_priv
, render_priv
->state
.pos_x
) - base_x
;
2044 y2scr_pos(render_priv
, render_priv
->state
.pos_y
) - base_y
;
2047 // fix clip coordinates (they depend on alignment)
2048 if (render_priv
->state
.evt_type
== EVENT_NORMAL
||
2049 render_priv
->state
.evt_type
== EVENT_HSCROLL
||
2050 render_priv
->state
.evt_type
== EVENT_VSCROLL
) {
2051 render_priv
->state
.clip_x0
=
2052 x2scr_scaled(render_priv
, render_priv
->state
.clip_x0
);
2053 render_priv
->state
.clip_x1
=
2054 x2scr_scaled(render_priv
, render_priv
->state
.clip_x1
);
2055 if (valign
== VALIGN_TOP
) {
2056 render_priv
->state
.clip_y0
=
2057 y2scr_top(render_priv
, render_priv
->state
.clip_y0
);
2058 render_priv
->state
.clip_y1
=
2059 y2scr_top(render_priv
, render_priv
->state
.clip_y1
);
2060 } else if (valign
== VALIGN_CENTER
) {
2061 render_priv
->state
.clip_y0
=
2062 y2scr(render_priv
, render_priv
->state
.clip_y0
);
2063 render_priv
->state
.clip_y1
=
2064 y2scr(render_priv
, render_priv
->state
.clip_y1
);
2065 } else if (valign
== VALIGN_SUB
) {
2066 render_priv
->state
.clip_y0
=
2067 y2scr_sub(render_priv
, render_priv
->state
.clip_y0
);
2068 render_priv
->state
.clip_y1
=
2069 y2scr_sub(render_priv
, render_priv
->state
.clip_y1
);
2071 } else if (render_priv
->state
.evt_type
== EVENT_POSITIONED
) {
2072 render_priv
->state
.clip_x0
=
2073 x2scr_pos_scaled(render_priv
, render_priv
->state
.clip_x0
);
2074 render_priv
->state
.clip_x1
=
2075 x2scr_pos_scaled(render_priv
, render_priv
->state
.clip_x1
);
2076 render_priv
->state
.clip_y0
=
2077 y2scr_pos(render_priv
, render_priv
->state
.clip_y0
);
2078 render_priv
->state
.clip_y1
=
2079 y2scr_pos(render_priv
, render_priv
->state
.clip_y1
);
2082 // calculate rotation parameters
2086 if (render_priv
->state
.have_origin
) {
2087 center
.x
= x2scr(render_priv
, render_priv
->state
.org_x
);
2088 center
.y
= y2scr(render_priv
, render_priv
->state
.org_y
);
2090 double bx
= 0., by
= 0.;
2091 get_base_point(&bbox
, alignment
, &bx
, &by
);
2092 center
.x
= device_x
+ bx
;
2093 center
.y
= device_y
+ by
;
2096 for (i
= 0; i
< text_info
->length
; ++i
) {
2097 GlyphInfo
*info
= glyphs
+ i
;
2099 if (info
->hash_key
.frx
|| info
->hash_key
.fry
2100 || info
->hash_key
.frz
|| info
->hash_key
.fax
2101 || info
->hash_key
.fay
) {
2102 info
->hash_key
.shift_x
= info
->pos
.x
+ double_to_d6(device_x
- center
.x
);
2103 info
->hash_key
.shift_y
=
2104 -(info
->pos
.y
+ double_to_d6(device_y
- center
.y
));
2106 info
->hash_key
.shift_x
= 0;
2107 info
->hash_key
.shift_y
= 0;
2112 // convert glyphs to bitmaps
2113 device_x
*= render_priv
->font_scale_x
;
2114 for (i
= 0; i
< text_info
->length
; ++i
) {
2115 GlyphInfo
*g
= glyphs
+ i
;
2116 g
->pos
.x
*= render_priv
->font_scale_x
;
2117 g
->hash_key
.advance
.x
=
2118 double_to_d6(device_x
- (int) device_x
+
2119 d6_to_double(g
->pos
.x
& SUBPIXEL_MASK
)) & ~SUBPIXEL_ACCURACY
;
2120 g
->hash_key
.advance
.y
=
2121 double_to_d6(device_y
- (int) device_y
+
2122 d6_to_double(g
->pos
.y
& SUBPIXEL_MASK
)) & ~SUBPIXEL_ACCURACY
;
2123 get_bitmap_glyph(render_priv
, glyphs
+ i
);
2126 memset(event_images
, 0, sizeof(*event_images
));
2127 event_images
->top
= device_y
- text_info
->lines
[0].asc
;
2128 event_images
->height
= text_info
->height
;
2129 event_images
->left
=
2130 (device_x
+ bbox
.xMin
* render_priv
->font_scale_x
) + 0.5;
2131 event_images
->width
=
2132 (bbox
.xMax
- bbox
.xMin
) * render_priv
->font_scale_x
+ 0.5;
2133 event_images
->detect_collisions
= render_priv
->state
.detect_collisions
;
2134 event_images
->shift_direction
= (valign
== VALIGN_TOP
) ? 1 : -1;
2135 event_images
->event
= event
;
2136 event_images
->imgs
= render_text(render_priv
, (int) device_x
, (int) device_y
);
2138 free_render_context(render_priv
);
2144 * \brief deallocate image list
2145 * \param img list pointer
2147 void ass_free_images(ASS_Image
*img
)
2150 ASS_Image
*next
= img
->next
;
2157 * \brief Check cache limits and reset cache if they are exceeded
2159 static void check_cache_limits(ASS_Renderer
*priv
, CacheStore
*cache
)
2161 if (cache
->bitmap_cache
->cache_size
> cache
->bitmap_max_size
) {
2162 ass_msg(priv
->library
, MSGL_V
,
2163 "Hitting hard bitmap cache limit (was: %ld bytes), "
2164 "resetting.", (long) cache
->bitmap_cache
->cache_size
);
2165 cache
->bitmap_cache
= ass_bitmap_cache_reset(cache
->bitmap_cache
);
2166 cache
->composite_cache
= ass_composite_cache_reset(
2167 cache
->composite_cache
);
2168 ass_free_images(priv
->prev_images_root
);
2169 priv
->prev_images_root
= 0;
2172 if (cache
->glyph_cache
->count
> cache
->glyph_max
2173 || cache
->glyph_cache
->cache_size
> cache
->bitmap_max_size
) {
2174 ass_msg(priv
->library
, MSGL_V
,
2175 "Hitting hard glyph cache limit (was: %d glyphs, %ld bytes), "
2177 cache
->glyph_cache
->count
, (long) cache
->glyph_cache
->cache_size
);
2178 cache
->glyph_cache
= ass_glyph_cache_reset(cache
->glyph_cache
);
2183 * \brief Start a new frame
2186 ass_start_frame(ASS_Renderer
*render_priv
, ASS_Track
*track
,
2189 ASS_Settings
*settings_priv
= &render_priv
->settings
;
2191 if (!render_priv
->settings
.frame_width
2192 && !render_priv
->settings
.frame_height
)
2193 return 1; // library not initialized
2195 if (render_priv
->library
!= track
->library
)
2198 if (!render_priv
->fontconfig_priv
)
2201 free_list_clear(render_priv
);
2203 if (track
->n_events
== 0)
2204 return 1; // nothing to do
2206 render_priv
->track
= track
;
2207 render_priv
->time
= now
;
2209 ass_lazy_track_init(render_priv
);
2211 render_priv
->font_scale
= settings_priv
->font_size_coeff
*
2212 render_priv
->orig_height
/ render_priv
->track
->PlayResY
;
2213 if (render_priv
->track
->ScaledBorderAndShadow
)
2214 render_priv
->border_scale
=
2215 ((double) render_priv
->orig_height
) /
2216 render_priv
->track
->PlayResY
;
2218 render_priv
->border_scale
= 1.;
2221 render_priv
->font_scale_x
= render_priv
->settings
.aspect
/
2222 render_priv
->settings
.storage_aspect
;
2224 render_priv
->prev_images_root
= render_priv
->images_root
;
2225 render_priv
->images_root
= 0;
2227 check_cache_limits(render_priv
, &render_priv
->cache
);
2232 static int cmp_event_layer(const void *p1
, const void *p2
)
2234 ASS_Event
*e1
= ((EventImages
*) p1
)->event
;
2235 ASS_Event
*e2
= ((EventImages
*) p2
)->event
;
2236 if (e1
->Layer
< e2
->Layer
)
2238 if (e1
->Layer
> e2
->Layer
)
2240 if (e1
->ReadOrder
< e2
->ReadOrder
)
2242 if (e1
->ReadOrder
> e2
->ReadOrder
)
2247 static ASS_RenderPriv
*get_render_priv(ASS_Renderer
*render_priv
,
2250 if (!event
->render_priv
)
2251 event
->render_priv
= calloc(1, sizeof(ASS_RenderPriv
));
2252 if (render_priv
->render_id
!= event
->render_priv
->render_id
) {
2253 memset(event
->render_priv
, 0, sizeof(ASS_RenderPriv
));
2254 event
->render_priv
->render_id
= render_priv
->render_id
;
2257 return event
->render_priv
;
2260 static int overlap(Segment
*s1
, Segment
*s2
)
2262 if (s1
->a
>= s2
->b
|| s2
->a
>= s1
->b
||
2263 s1
->ha
>= s2
->hb
|| s2
->ha
>= s1
->hb
)
2268 static int cmp_segment(const void *p1
, const void *p2
)
2270 return ((Segment
*) p1
)->a
- ((Segment
*) p2
)->a
;
2274 shift_event(ASS_Renderer
*render_priv
, EventImages
*ei
, int shift
)
2276 ASS_Image
*cur
= ei
->imgs
;
2278 cur
->dst_y
+= shift
;
2279 // clip top and bottom
2280 if (cur
->dst_y
< 0) {
2281 int clip
= -cur
->dst_y
;
2283 cur
->bitmap
+= clip
* cur
->stride
;
2286 if (cur
->dst_y
+ cur
->h
>= render_priv
->height
) {
2287 int clip
= cur
->dst_y
+ cur
->h
- render_priv
->height
;
2299 // dir: 1 - move down
2301 static int fit_segment(Segment
*s
, Segment
*fixed
, int *cnt
, int dir
)
2306 if (dir
== 1) // move down
2307 for (i
= 0; i
< *cnt
; ++i
) {
2308 if (s
->b
+ shift
<= fixed
[i
].a
|| s
->a
+ shift
>= fixed
[i
].b
||
2309 s
->hb
<= fixed
[i
].ha
|| s
->ha
>= fixed
[i
].hb
)
2311 shift
= fixed
[i
].b
- s
->a
;
2312 } else // dir == -1, move up
2313 for (i
= *cnt
- 1; i
>= 0; --i
) {
2314 if (s
->b
+ shift
<= fixed
[i
].a
|| s
->a
+ shift
>= fixed
[i
].b
||
2315 s
->hb
<= fixed
[i
].ha
|| s
->ha
>= fixed
[i
].hb
)
2317 shift
= fixed
[i
].a
- s
->b
;
2320 fixed
[*cnt
].a
= s
->a
+ shift
;
2321 fixed
[*cnt
].b
= s
->b
+ shift
;
2322 fixed
[*cnt
].ha
= s
->ha
;
2323 fixed
[*cnt
].hb
= s
->hb
;
2325 qsort(fixed
, *cnt
, sizeof(Segment
), cmp_segment
);
2331 fix_collisions(ASS_Renderer
*render_priv
, EventImages
*imgs
, int cnt
)
2333 Segment
*used
= malloc(cnt
* sizeof(*used
));
2337 // fill used[] with fixed events
2338 for (i
= 0; i
< cnt
; ++i
) {
2339 ASS_RenderPriv
*priv
;
2340 if (!imgs
[i
].detect_collisions
)
2342 priv
= get_render_priv(render_priv
, imgs
[i
].event
);
2343 if (priv
->height
> 0) { // it's a fixed event
2346 s
.b
= priv
->top
+ priv
->height
;
2348 s
.hb
= priv
->left
+ priv
->width
;
2349 if (priv
->height
!= imgs
[i
].height
) { // no, it's not
2350 ass_msg(render_priv
->library
, MSGL_WARN
,
2351 "Event height has changed");
2357 for (j
= 0; j
< cnt_used
; ++j
)
2358 if (overlap(&s
, used
+ j
)) { // no, it's not
2364 if (priv
->height
> 0) { // still a fixed event
2365 used
[cnt_used
].a
= priv
->top
;
2366 used
[cnt_used
].b
= priv
->top
+ priv
->height
;
2367 used
[cnt_used
].ha
= priv
->left
;
2368 used
[cnt_used
].hb
= priv
->left
+ priv
->width
;
2370 shift_event(render_priv
, imgs
+ i
, priv
->top
- imgs
[i
].top
);
2374 qsort(used
, cnt_used
, sizeof(Segment
), cmp_segment
);
2376 // try to fit other events in free spaces
2377 for (i
= 0; i
< cnt
; ++i
) {
2378 ASS_RenderPriv
*priv
;
2379 if (!imgs
[i
].detect_collisions
)
2381 priv
= get_render_priv(render_priv
, imgs
[i
].event
);
2382 if (priv
->height
== 0) { // not a fixed event
2386 s
.b
= imgs
[i
].top
+ imgs
[i
].height
;
2387 s
.ha
= imgs
[i
].left
;
2388 s
.hb
= imgs
[i
].left
+ imgs
[i
].width
;
2389 shift
= fit_segment(&s
, used
, &cnt_used
, imgs
[i
].shift_direction
);
2391 shift_event(render_priv
, imgs
+ i
, shift
);
2393 priv
->top
= imgs
[i
].top
;
2394 priv
->height
= imgs
[i
].height
;
2395 priv
->left
= imgs
[i
].left
;
2396 priv
->width
= imgs
[i
].width
;
2405 * \brief compare two images
2406 * \param i1 first image
2407 * \param i2 second image
2408 * \return 0 if identical, 1 if different positions, 2 if different content
2410 static int ass_image_compare(ASS_Image
*i1
, ASS_Image
*i2
)
2416 if (i1
->stride
!= i2
->stride
)
2418 if (i1
->color
!= i2
->color
)
2420 if (i1
->bitmap
!= i2
->bitmap
)
2422 if (i1
->dst_x
!= i2
->dst_x
)
2424 if (i1
->dst_y
!= i2
->dst_y
)
2430 * \brief compare current and previous image list
2431 * \param priv library handle
2432 * \return 0 if identical, 1 if different positions, 2 if different content
2434 static int ass_detect_change(ASS_Renderer
*priv
)
2436 ASS_Image
*img
, *img2
;
2439 img
= priv
->prev_images_root
;
2440 img2
= priv
->images_root
;
2442 while (img
&& diff
< 2) {
2443 ASS_Image
*next
, *next2
;
2446 int d
= ass_image_compare(img
, img2
);
2451 // previous list is shorter
2459 // is the previous list longer?
2467 * \brief render a frame
2468 * \param priv library handle
2469 * \param track track
2470 * \param now current video timestamp (ms)
2471 * \param detect_change a value describing how the new images differ from the previous ones will be written here:
2472 * 0 if identical, 1 if different positions, 2 if different content.
2473 * Can be NULL, in that case no detection is performed.
2475 ASS_Image
*ass_render_frame(ASS_Renderer
*priv
, ASS_Track
*track
,
2476 long long now
, int *detect_change
)
2483 rc
= ass_start_frame(priv
, track
, now
);
2487 // render events separately
2489 for (i
= 0; i
< track
->n_events
; ++i
) {
2490 ASS_Event
*event
= track
->events
+ i
;
2491 if ((event
->Start
<= now
)
2492 && (now
< (event
->Start
+ event
->Duration
))) {
2493 if (cnt
>= priv
->eimg_size
) {
2494 priv
->eimg_size
+= 100;
2497 priv
->eimg_size
* sizeof(EventImages
));
2499 rc
= ass_render_event(priv
, event
, priv
->eimg
+ cnt
);
2506 qsort(priv
->eimg
, cnt
, sizeof(EventImages
), cmp_event_layer
);
2508 // call fix_collisions for each group of events with the same layer
2510 for (i
= 1; i
< cnt
; ++i
)
2511 if (last
->event
->Layer
!= priv
->eimg
[i
].event
->Layer
) {
2512 fix_collisions(priv
, last
, priv
->eimg
+ i
- last
);
2513 last
= priv
->eimg
+ i
;
2516 fix_collisions(priv
, last
, priv
->eimg
+ cnt
- last
);
2519 tail
= &priv
->images_root
;
2520 for (i
= 0; i
< cnt
; ++i
) {
2521 ASS_Image
*cur
= priv
->eimg
[i
].imgs
;
2530 *detect_change
= ass_detect_change(priv
);
2532 // free the previous image list
2533 ass_free_images(priv
->prev_images_root
);
2534 priv
->prev_images_root
= 0;
2536 return priv
->images_root
;