2 * Copyright (C) 2006 Evgeniy Stepanov <eugeni.stepanov@gmail.com>
4 * This file is part of libass.
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
24 #include "ass_render.h"
25 #include "ass_parse.h"
26 #include "ass_shaper.h"
28 #define MAX_GLYPHS_INITIAL 1024
29 #define MAX_LINES_INITIAL 64
30 #define SUBPIXEL_MASK 63
31 #define SUBPIXEL_ACCURACY 7
33 ASS_Renderer
*ass_renderer_init(ASS_Library
*library
)
37 ASS_Renderer
*priv
= 0;
38 int vmajor
, vminor
, vpatch
;
40 error
= FT_Init_FreeType(&ft
);
42 ass_msg(library
, MSGL_FATAL
, "%s failed", "FT_Init_FreeType");
46 FT_Library_Version(ft
, &vmajor
, &vminor
, &vpatch
);
47 ass_msg(library
, MSGL_V
, "FreeType library version: %d.%d.%d",
48 vmajor
, vminor
, vpatch
);
49 ass_msg(library
, MSGL_V
, "FreeType headers version: %d.%d.%d",
50 FREETYPE_MAJOR
, FREETYPE_MINOR
, FREETYPE_PATCH
);
52 priv
= calloc(1, sizeof(ASS_Renderer
));
58 priv
->synth_priv
= ass_synth_init(BLUR_MAX_RADIUS
);
60 priv
->library
= library
;
62 // images_root and related stuff is zero-filled in calloc
64 priv
->cache
.font_cache
= ass_font_cache_create();
65 priv
->cache
.bitmap_cache
= ass_bitmap_cache_create();
66 priv
->cache
.composite_cache
= ass_composite_cache_create();
67 priv
->cache
.outline_cache
= ass_outline_cache_create();
68 priv
->cache
.glyph_max
= GLYPH_CACHE_MAX
;
69 priv
->cache
.bitmap_max_size
= BITMAP_CACHE_MAX_SIZE
;
71 priv
->text_info
.max_glyphs
= MAX_GLYPHS_INITIAL
;
72 priv
->text_info
.max_lines
= MAX_LINES_INITIAL
;
73 priv
->text_info
.glyphs
= calloc(MAX_GLYPHS_INITIAL
, sizeof(GlyphInfo
));
74 priv
->text_info
.lines
= calloc(MAX_LINES_INITIAL
, sizeof(LineInfo
));
76 priv
->settings
.font_size_coeff
= 1.;
78 priv
->shaper
= ass_shaper_new(0);
79 ass_shaper_info(library
);
83 ass_msg(library
, MSGL_V
, "Init");
85 ass_msg(library
, MSGL_ERR
, "Init failed");
90 static void free_list_clear(ASS_Renderer
*render_priv
)
92 if (render_priv
->free_head
) {
93 FreeList
*item
= render_priv
->free_head
;
100 render_priv
->free_head
= NULL
;
104 void ass_renderer_done(ASS_Renderer
*render_priv
)
106 ass_cache_done(render_priv
->cache
.font_cache
);
107 ass_cache_done(render_priv
->cache
.bitmap_cache
);
108 ass_cache_done(render_priv
->cache
.composite_cache
);
109 ass_cache_done(render_priv
->cache
.outline_cache
);
111 ass_free_images(render_priv
->images_root
);
112 ass_free_images(render_priv
->prev_images_root
);
114 if (render_priv
->state
.stroker
) {
115 FT_Stroker_Done(render_priv
->state
.stroker
);
116 render_priv
->state
.stroker
= 0;
118 if (render_priv
->ftlibrary
)
119 FT_Done_FreeType(render_priv
->ftlibrary
);
120 if (render_priv
->fontconfig_priv
)
121 fontconfig_done(render_priv
->fontconfig_priv
);
122 if (render_priv
->synth_priv
)
123 ass_synth_done(render_priv
->synth_priv
);
124 ass_shaper_free(render_priv
->shaper
);
125 free(render_priv
->eimg
);
126 free(render_priv
->text_info
.glyphs
);
127 free(render_priv
->text_info
.lines
);
129 free(render_priv
->settings
.default_font
);
130 free(render_priv
->settings
.default_family
);
132 free_list_clear(render_priv
);
137 * \brief Create a new ASS_Image
138 * Parameters are the same as ASS_Image fields.
140 static ASS_Image
*my_draw_bitmap(unsigned char *bitmap
, int bitmap_w
,
141 int bitmap_h
, int stride
, int dst_x
,
142 int dst_y
, uint32_t color
)
144 ASS_Image
*img
= malloc(sizeof(ASS_Image
));
149 img
->stride
= stride
;
150 img
->bitmap
= bitmap
;
160 * \brief Mapping between script and screen coordinates
162 static double x2scr(ASS_Renderer
*render_priv
, double x
)
164 return x
* render_priv
->orig_width_nocrop
/ render_priv
->font_scale_x
/
165 render_priv
->track
->PlayResX
+
166 FFMAX(render_priv
->settings
.left_margin
, 0);
168 static double x2scr_pos(ASS_Renderer
*render_priv
, double x
)
170 return x
* render_priv
->orig_width
/ render_priv
->font_scale_x
/ render_priv
->track
->PlayResX
+
171 render_priv
->settings
.left_margin
;
173 static double x2scr_scaled(ASS_Renderer
*render_priv
, double x
)
175 return x
* render_priv
->orig_width_nocrop
/
176 render_priv
->track
->PlayResX
+
177 FFMAX(render_priv
->settings
.left_margin
, 0);
179 static double x2scr_pos_scaled(ASS_Renderer
*render_priv
, double x
)
181 return x
* render_priv
->orig_width
/ render_priv
->track
->PlayResX
+
182 render_priv
->settings
.left_margin
;
185 * \brief Mapping between script and screen coordinates
187 static double y2scr(ASS_Renderer
*render_priv
, double y
)
189 return y
* render_priv
->orig_height_nocrop
/
190 render_priv
->track
->PlayResY
+
191 FFMAX(render_priv
->settings
.top_margin
, 0);
193 static double y2scr_pos(ASS_Renderer
*render_priv
, double y
)
195 return y
* render_priv
->orig_height
/ render_priv
->track
->PlayResY
+
196 render_priv
->settings
.top_margin
;
199 // the same for toptitles
200 static double y2scr_top(ASS_Renderer
*render_priv
, double y
)
202 if (render_priv
->settings
.use_margins
)
203 return y
* render_priv
->orig_height_nocrop
/
204 render_priv
->track
->PlayResY
;
206 return y
* render_priv
->orig_height_nocrop
/
207 render_priv
->track
->PlayResY
+
208 FFMAX(render_priv
->settings
.top_margin
, 0);
210 // the same for subtitles
211 static double y2scr_sub(ASS_Renderer
*render_priv
, double y
)
213 if (render_priv
->settings
.use_margins
)
214 return y
* render_priv
->orig_height_nocrop
/
215 render_priv
->track
->PlayResY
+
216 FFMAX(render_priv
->settings
.top_margin
, 0)
217 + FFMAX(render_priv
->settings
.bottom_margin
, 0);
219 return y
* render_priv
->orig_height_nocrop
/
220 render_priv
->track
->PlayResY
+
221 FFMAX(render_priv
->settings
.top_margin
, 0);
225 * \brief Convert bitmap glyphs into ASS_Image list with inverse clipping
227 * Inverse clipping with the following strategy:
228 * - find rectangle from (x0, y0) to (cx0, y1)
229 * - find rectangle from (cx0, y0) to (cx1, cy0)
230 * - find rectangle from (cx0, cy1) to (cx1, y1)
231 * - find rectangle from (cx1, y0) to (x1, y1)
232 * These rectangles can be invalid and in this case are discarded.
233 * Afterwards, they are clipped against the screen coordinates.
234 * In an additional pass, the rectangles need to be split up left/right for
235 * karaoke effects. This can result in a lot of bitmaps (6 to be exact).
237 static ASS_Image
**render_glyph_i(ASS_Renderer
*render_priv
,
238 Bitmap
*bm
, int dst_x
, int dst_y
,
239 uint32_t color
, uint32_t color2
, int brk
,
242 int i
, j
, x0
, y0
, x1
, y1
, cx0
, cy0
, cx1
, cy1
, sx
, sy
, zx
, zy
;
249 // we still need to clip against screen boundaries
250 zx
= x2scr_pos_scaled(render_priv
, 0);
251 zy
= y2scr_pos(render_priv
, 0);
252 sx
= x2scr_pos_scaled(render_priv
, render_priv
->track
->PlayResX
);
253 sy
= y2scr_pos(render_priv
, render_priv
->track
->PlayResY
);
259 cx0
= render_priv
->state
.clip_x0
- dst_x
;
260 cy0
= render_priv
->state
.clip_y0
- dst_y
;
261 cx1
= render_priv
->state
.clip_x1
- dst_x
;
262 cy1
= render_priv
->state
.clip_y1
- dst_y
;
264 // calculate rectangles and discard invalid ones while we're at it.
268 r
[i
].x1
= (cx0
> x1
) ? x1
: cx0
;
270 if (r
[i
].x1
> r
[i
].x0
&& r
[i
].y1
> r
[i
].y0
) i
++;
271 r
[i
].x0
= (cx0
< 0) ? x0
: cx0
;
273 r
[i
].x1
= (cx1
> x1
) ? x1
: cx1
;
274 r
[i
].y1
= (cy0
> y1
) ? y1
: cy0
;
275 if (r
[i
].x1
> r
[i
].x0
&& r
[i
].y1
> r
[i
].y0
) i
++;
276 r
[i
].x0
= (cx0
< 0) ? x0
: cx0
;
277 r
[i
].y0
= (cy1
< 0) ? y0
: cy1
;
278 r
[i
].x1
= (cx1
> x1
) ? x1
: cx1
;
280 if (r
[i
].x1
> r
[i
].x0
&& r
[i
].y1
> r
[i
].y0
) i
++;
281 r
[i
].x0
= (cx1
< 0) ? x0
: cx1
;
285 if (r
[i
].x1
> r
[i
].x0
&& r
[i
].y1
> r
[i
].y0
) i
++;
287 // clip each rectangle to screen coordinates
288 for (j
= 0; j
< i
; j
++) {
289 r
[j
].x0
= (r
[j
].x0
+ dst_x
< zx
) ? zx
- dst_x
: r
[j
].x0
;
290 r
[j
].y0
= (r
[j
].y0
+ dst_y
< zy
) ? zy
- dst_y
: r
[j
].y0
;
291 r
[j
].x1
= (r
[j
].x1
+ dst_x
> sx
) ? sx
- dst_x
: r
[j
].x1
;
292 r
[j
].y1
= (r
[j
].y1
+ dst_y
> sy
) ? sy
- dst_y
: r
[j
].y1
;
295 // draw the rectangles
296 for (j
= 0; j
< i
; j
++) {
298 // kick out rectangles that are invalid now
299 if (r
[j
].x1
<= r
[j
].x0
|| r
[j
].y1
<= r
[j
].y0
)
301 // split up into left and right for karaoke, if needed
302 if (lbrk
> r
[j
].x0
) {
303 if (lbrk
> r
[j
].x1
) lbrk
= r
[j
].x1
;
304 img
= my_draw_bitmap(bm
->buffer
+ r
[j
].y0
* bm
->stride
+ r
[j
].x0
,
305 lbrk
- r
[j
].x0
, r
[j
].y1
- r
[j
].y0
,
306 bm
->stride
, dst_x
+ r
[j
].x0
, dst_y
+ r
[j
].y0
, color
);
311 if (lbrk
< r
[j
].x1
) {
312 if (lbrk
< r
[j
].x0
) lbrk
= r
[j
].x0
;
313 img
= my_draw_bitmap(bm
->buffer
+ r
[j
].y0
* bm
->stride
+ lbrk
,
314 r
[j
].x1
- lbrk
, r
[j
].y1
- r
[j
].y0
,
315 bm
->stride
, dst_x
+ lbrk
, dst_y
+ r
[j
].y0
, color2
);
326 * \brief convert bitmap glyph into ASS_Image struct(s)
327 * \param bit freetype bitmap glyph, FT_PIXEL_MODE_GRAY
328 * \param dst_x bitmap x coordinate in video frame
329 * \param dst_y bitmap y coordinate in video frame
330 * \param color first color, RGBA
331 * \param color2 second color, RGBA
332 * \param brk x coordinate relative to glyph origin, color is used to the left of brk, color2 - to the right
333 * \param tail pointer to the last image's next field, head of the generated list should be stored here
334 * \return pointer to the new list tail
335 * Performs clipping. Uses my_draw_bitmap for actual bitmap convertion.
338 render_glyph(ASS_Renderer
*render_priv
, Bitmap
*bm
, int dst_x
, int dst_y
,
339 uint32_t color
, uint32_t color2
, int brk
, ASS_Image
**tail
)
341 // Inverse clipping in use?
342 if (render_priv
->state
.clip_mode
)
343 return render_glyph_i(render_priv
, bm
, dst_x
, dst_y
, color
, color2
,
346 // brk is relative to dst_x
347 // color = color left of brk
348 // color2 = color right of brk
349 int b_x0
, b_y0
, b_x1
, b_y1
; // visible part of the bitmap
350 int clip_x0
, clip_y0
, clip_x1
, clip_y1
;
359 clip_x0
= FFMINMAX(render_priv
->state
.clip_x0
, 0, render_priv
->width
);
360 clip_y0
= FFMINMAX(render_priv
->state
.clip_y0
, 0, render_priv
->height
);
361 clip_x1
= FFMINMAX(render_priv
->state
.clip_x1
, 0, render_priv
->width
);
362 clip_y1
= FFMINMAX(render_priv
->state
.clip_y1
, 0, render_priv
->height
);
368 tmp
= dst_x
- clip_x0
;
370 ass_msg(render_priv
->library
, MSGL_DBG2
, "clip left");
373 tmp
= dst_y
- clip_y0
;
375 ass_msg(render_priv
->library
, MSGL_DBG2
, "clip top");
378 tmp
= clip_x1
- dst_x
- bm
->w
;
380 ass_msg(render_priv
->library
, MSGL_DBG2
, "clip right");
383 tmp
= clip_y1
- dst_y
- bm
->h
;
385 ass_msg(render_priv
->library
, MSGL_DBG2
, "clip bottom");
389 if ((b_y0
>= b_y1
) || (b_x0
>= b_x1
))
392 if (brk
> b_x0
) { // draw left part
395 img
= my_draw_bitmap(bm
->buffer
+ bm
->stride
* b_y0
+ b_x0
,
396 brk
- b_x0
, b_y1
- b_y0
, bm
->stride
,
397 dst_x
+ b_x0
, dst_y
+ b_y0
, color
);
398 if (!img
) return tail
;
402 if (brk
< b_x1
) { // draw right part
405 img
= my_draw_bitmap(bm
->buffer
+ bm
->stride
* b_y0
+ brk
,
406 b_x1
- brk
, b_y1
- b_y0
, bm
->stride
,
407 dst_x
+ brk
, dst_y
+ b_y0
, color2
);
408 if (!img
) return tail
;
416 * \brief Replace the bitmap buffer in ASS_Image with a copy
417 * \param img ASS_Image to operate on
418 * \return pointer to old bitmap buffer
420 static unsigned char *clone_bitmap_buffer(ASS_Image
*img
)
422 unsigned char *old_bitmap
= img
->bitmap
;
423 int size
= img
->stride
* (img
->h
- 1) + img
->w
;
424 img
->bitmap
= malloc(size
);
425 memcpy(img
->bitmap
, old_bitmap
, size
);
430 * \brief Calculate overlapping area of two consecutive bitmaps and in case they
431 * overlap, blend them together
432 * Mainly useful for translucent glyphs and especially borders, to avoid the
433 * luminance adding up where they overlap (which looks ugly)
436 render_overlap(ASS_Renderer
*render_priv
, ASS_Image
**last_tail
,
439 int left
, top
, bottom
, right
;
440 int old_left
, old_top
, w
, h
, cur_left
, cur_top
;
441 int x
, y
, opos
, cpos
;
444 CompositeHashValue
*hv
;
445 CompositeHashValue chv
;
446 int ax
= (*last_tail
)->dst_x
;
447 int ay
= (*last_tail
)->dst_y
;
448 int aw
= (*last_tail
)->w
;
449 int as
= (*last_tail
)->stride
;
450 int ah
= (*last_tail
)->h
;
451 int bx
= (*tail
)->dst_x
;
452 int by
= (*tail
)->dst_y
;
454 int bs
= (*tail
)->stride
;
459 if ((*last_tail
)->bitmap
== (*tail
)->bitmap
)
462 if ((*last_tail
)->color
!= (*tail
)->color
)
465 // Calculate overlap coordinates
466 left
= (ax
> bx
) ? ax
: bx
;
467 top
= (ay
> by
) ? ay
: by
;
468 right
= ((ax
+ aw
) < (bx
+ bw
)) ? (ax
+ aw
) : (bx
+ bw
);
469 bottom
= ((ay
+ ah
) < (by
+ bh
)) ? (ay
+ ah
) : (by
+ bh
);
470 if ((right
<= left
) || (bottom
<= top
))
472 old_left
= left
- ax
;
476 cur_left
= left
- bx
;
480 hk
.a
= (*last_tail
)->bitmap
;
481 hk
.b
= (*tail
)->bitmap
;
492 hv
= ass_cache_get(render_priv
->cache
.composite_cache
, &hk
);
494 (*last_tail
)->bitmap
= hv
->a
;
495 (*tail
)->bitmap
= hv
->b
;
498 // Allocate new bitmaps and copy over data
499 a
= clone_bitmap_buffer(*last_tail
);
500 b
= clone_bitmap_buffer(*tail
);
502 // Blend overlapping area
503 for (y
= 0; y
< h
; y
++)
504 for (x
= 0; x
< w
; x
++) {
505 opos
= (old_top
+ y
) * (as
) + (old_left
+ x
);
506 cpos
= (cur_top
+ y
) * (bs
) + (cur_left
+ x
);
507 m
= FFMIN(a
[opos
] + b
[cpos
], 0xff);
508 (*last_tail
)->bitmap
[opos
] = 0;
509 (*tail
)->bitmap
[cpos
] = m
;
512 // Insert bitmaps into the cache
513 chv
.a
= (*last_tail
)->bitmap
;
514 chv
.b
= (*tail
)->bitmap
;
515 ass_cache_put(render_priv
->cache
.composite_cache
, &hk
, &chv
);
518 static void free_list_add(ASS_Renderer
*render_priv
, void *object
)
520 if (!render_priv
->free_head
) {
521 render_priv
->free_head
= calloc(1, sizeof(FreeList
));
522 render_priv
->free_head
->object
= object
;
523 render_priv
->free_tail
= render_priv
->free_head
;
525 FreeList
*l
= calloc(1, sizeof(FreeList
));
527 render_priv
->free_tail
->next
= l
;
528 render_priv
->free_tail
= render_priv
->free_tail
->next
;
533 * Iterate through a list of bitmaps and blend with clip vector, if
534 * applicable. The blended bitmaps are added to a free list which is freed
535 * at the start of a new frame.
537 static void blend_vector_clip(ASS_Renderer
*render_priv
,
541 Bitmap
*clip_bm
= NULL
;
543 ASS_Drawing
*drawing
= render_priv
->state
.clip_drawing
;
545 BitmapHashValue
*val
;
551 // Try to get mask from cache
552 memset(&key
, 0, sizeof(key
));
553 key
.type
= BITMAP_CLIP
;
554 key
.u
.clip
.text
= strdup(drawing
->text
);
555 val
= ass_cache_get(render_priv
->cache
.bitmap_cache
, &key
);
562 // Not found in cache, parse and rasterize it
563 outline
= ass_drawing_parse(drawing
, 1);
565 ass_msg(render_priv
->library
, MSGL_WARN
,
566 "Clip vector parsing failed. Skipping.");
567 goto blend_vector_error
;
570 // We need to translate the clip according to screen borders
571 if (render_priv
->settings
.left_margin
!= 0 ||
572 render_priv
->settings
.top_margin
!= 0) {
574 .x
= int_to_d6(render_priv
->settings
.left_margin
),
575 .y
= -int_to_d6(render_priv
->settings
.top_margin
),
577 FT_Outline_Translate(outline
, trans
.x
, trans
.y
);
580 ass_msg(render_priv
->library
, MSGL_DBG2
,
581 "Parsed vector clip: scales (%f, %f) string [%s]\n",
582 drawing
->scale_x
, drawing
->scale_y
, drawing
->text
);
584 clip_bm
= outline_to_bitmap(render_priv
->library
,
585 render_priv
->ftlibrary
, outline
, 0);
586 if (clip_bm
== NULL
) {
587 ass_msg(render_priv
->library
, MSGL_WARN
,
588 "Clip vector rasterization failed: %d. Skipping.", error
);
592 memset(&v
, 0, sizeof(v
));
594 ass_cache_put(render_priv
->cache
.bitmap_cache
, &key
, &v
);
598 if (!clip_bm
) goto blend_vector_exit
;
600 // Iterate through bitmaps and blend/clip them
601 for (cur
= head
; cur
; cur
= cur
->next
) {
602 int left
, top
, right
, bottom
, apos
, bpos
, y
, x
, w
, h
;
603 int ax
, ay
, aw
, ah
, as
;
604 int bx
, by
, bw
, bh
, bs
;
605 int aleft
, atop
, bleft
, btop
;
606 unsigned char *abuffer
, *bbuffer
, *nbuffer
;
608 abuffer
= cur
->bitmap
;
609 bbuffer
= clip_bm
->buffer
;
619 bs
= clip_bm
->stride
;
621 // Calculate overlap coordinates
622 left
= (ax
> bx
) ? ax
: bx
;
623 top
= (ay
> by
) ? ay
: by
;
624 right
= ((ax
+ aw
) < (bx
+ bw
)) ? (ax
+ aw
) : (bx
+ bw
);
625 bottom
= ((ay
+ ah
) < (by
+ bh
)) ? (ay
+ ah
) : (by
+ bh
);
633 if (render_priv
->state
.clip_drawing_mode
) {
635 if (ax
+ aw
< bx
|| ay
+ ah
< by
|| ax
> bx
+ bw
||
640 // Allocate new buffer and add to free list
641 nbuffer
= malloc(as
* ah
);
642 if (!nbuffer
) goto blend_vector_exit
;
643 free_list_add(render_priv
, nbuffer
);
646 memcpy(nbuffer
, abuffer
, as
* (ah
- 1) + aw
);
647 for (y
= 0; y
< h
; y
++)
648 for (x
= 0; x
< w
; x
++) {
649 apos
= (atop
+ y
) * as
+ aleft
+ x
;
650 bpos
= (btop
+ y
) * bs
+ bleft
+ x
;
651 nbuffer
[apos
] = FFMAX(0, abuffer
[apos
] - bbuffer
[bpos
]);
655 if (ax
+ aw
< bx
|| ay
+ ah
< by
|| ax
> bx
+ bw
||
661 // Allocate new buffer and add to free list
662 nbuffer
= calloc(as
, ah
);
663 if (!nbuffer
) goto blend_vector_exit
;
664 free_list_add(render_priv
, nbuffer
);
667 for (y
= 0; y
< h
; y
++)
668 for (x
= 0; x
< w
; x
++) {
669 apos
= (atop
+ y
) * as
+ aleft
+ x
;
670 bpos
= (btop
+ y
) * bs
+ bleft
+ x
;
671 nbuffer
[apos
] = (abuffer
[apos
] * bbuffer
[bpos
] + 255) >> 8;
674 cur
->bitmap
= nbuffer
;
678 ass_drawing_free(render_priv
->state
.clip_drawing
);
679 render_priv
->state
.clip_drawing
= 0;
683 * \brief Convert TextInfo struct to ASS_Image list
684 * Splits glyphs in halves when needed (for \kf karaoke).
686 static ASS_Image
*render_text(ASS_Renderer
*render_priv
, int dst_x
, int dst_y
)
692 ASS_Image
**tail
= &head
;
693 ASS_Image
**last_tail
= 0;
694 ASS_Image
**here_tail
= 0;
695 TextInfo
*text_info
= &render_priv
->text_info
;
697 for (i
= 0; i
< text_info
->length
; ++i
) {
698 GlyphInfo
*info
= text_info
->glyphs
+ i
;
699 if ((info
->symbol
== 0) || (info
->symbol
== '\n') || !info
->bm_s
700 || (info
->shadow_x
== 0 && info
->shadow_y
== 0) || info
->skip
)
710 dst_x
+ (info
->pos
.x
>> 6) +
711 (int) (info
->shadow_x
* render_priv
->border_scale
);
713 dst_y
+ (info
->pos
.y
>> 6) +
714 (int) (info
->shadow_y
* render_priv
->border_scale
);
719 render_glyph(render_priv
, bm
, pen_x
, pen_y
, info
->c
[3], 0,
722 if (last_tail
&& tail
!= here_tail
&& ((info
->c
[3] & 0xff) > 0))
723 render_overlap(render_priv
, last_tail
, here_tail
);
724 last_tail
= here_tail
;
731 for (i
= 0; i
< text_info
->length
; ++i
) {
732 GlyphInfo
*info
= text_info
->glyphs
+ i
;
733 if ((info
->symbol
== 0) || (info
->symbol
== '\n') || !info
->bm_o
743 pen_x
= dst_x
+ (info
->pos
.x
>> 6);
744 pen_y
= dst_y
+ (info
->pos
.y
>> 6);
747 if ((info
->effect_type
== EF_KARAOKE_KO
)
748 && (info
->effect_timing
<= (info
->bbox
.xMax
>> 6))) {
753 render_glyph(render_priv
, bm
, pen_x
, pen_y
, info
->c
[2],
755 if (last_tail
&& tail
!= here_tail
&& ((info
->c
[2] & 0xff) > 0))
756 render_overlap(render_priv
, last_tail
, here_tail
);
758 last_tail
= here_tail
;
764 for (i
= 0; i
< text_info
->length
; ++i
) {
765 GlyphInfo
*info
= text_info
->glyphs
+ i
;
766 if ((info
->symbol
== 0) || (info
->symbol
== '\n') || !info
->bm
776 pen_x
= dst_x
+ (info
->pos
.x
>> 6);
777 pen_y
= dst_y
+ (info
->pos
.y
>> 6);
780 if ((info
->effect_type
== EF_KARAOKE
)
781 || (info
->effect_type
== EF_KARAOKE_KO
)) {
782 if (info
->effect_timing
> (info
->bbox
.xMax
>> 6))
784 render_glyph(render_priv
, bm
, pen_x
, pen_y
,
785 info
->c
[0], 0, 1000000, tail
);
788 render_glyph(render_priv
, bm
, pen_x
, pen_y
,
789 info
->c
[1], 0, 1000000, tail
);
790 } else if (info
->effect_type
== EF_KARAOKE_KF
) {
792 render_glyph(render_priv
, bm
, pen_x
, pen_y
, info
->c
[0],
793 info
->c
[1], info
->effect_timing
, tail
);
796 render_glyph(render_priv
, bm
, pen_x
, pen_y
, info
->c
[0],
803 blend_vector_clip(render_priv
, head
);
808 static void compute_string_bbox(TextInfo
*text
, DBBox
*bbox
)
812 if (text
->length
> 0) {
815 bbox
->yMin
= -1 * text
->lines
[0].asc
+ d6_to_double(text
->glyphs
[0].pos
.y
);
816 bbox
->yMax
= text
->height
- text
->lines
[0].asc
+
817 d6_to_double(text
->glyphs
[0].pos
.y
);
819 for (i
= 0; i
< text
->length
; ++i
) {
820 GlyphInfo
*info
= text
->glyphs
+ i
;
821 if (info
->skip
) continue;
823 double s
= d6_to_double(info
->pos
.x
);
824 double e
= s
+ d6_to_double(info
->advance
.x
);
825 bbox
->xMin
= FFMIN(bbox
->xMin
, s
);
826 bbox
->xMax
= FFMAX(bbox
->xMax
, e
);
831 bbox
->xMin
= bbox
->xMax
= bbox
->yMin
= bbox
->yMax
= 0.;
835 * \brief Compute the size of the target bitmap for a run of outlines.
836 * \param run first outline of the run
837 * \param len run length
838 * \param w returns target width, in pixels
839 * \param h returns target height, in pixels
841 static void compute_run_size(GlyphInfo
*run
, size_t len
, int *w
, int *h
)
845 bbox
.xMin
= bbox
.yMin
= INT_MAX
;
846 bbox
.xMax
= bbox
.yMax
= INT_MIN
;
848 for (i
= 0; i
< len
; i
++) {
849 GlyphInfo
*info
= run
+ i
;
850 if (info
->skip
|| info
->symbol
== 0 || info
->symbol
== '\n')
852 bbox
.xMin
= FFMIN(bbox
.xMin
, info
->pos
.x
+ info
->bbox
.xMin
);
853 bbox
.yMin
= FFMIN(bbox
.yMin
, info
->pos
.y
+ info
->bbox
.yMin
);
854 bbox
.xMax
= FFMAX(bbox
.xMax
, info
->pos
.x
+ info
->bbox
.xMax
);
855 bbox
.yMax
= FFMAX(bbox
.yMax
, info
->pos
.y
+ info
->bbox
.yMax
);
859 bbox
.xMax
= (bbox
.xMax
+ 63) & ~63;
860 bbox
.yMax
= (bbox
.yMax
+ 63) & ~63;
861 *w
= (bbox
.xMax
- bbox
.xMin
) >> 6;
862 *h
= (bbox
.yMax
- bbox
.yMin
) >> 6;
866 * \brief partially reset render_context to style values
867 * Works like {\r}: resets some style overrides
869 void reset_render_context(ASS_Renderer
*render_priv
)
871 render_priv
->state
.c
[0] = render_priv
->state
.style
->PrimaryColour
;
872 render_priv
->state
.c
[1] = render_priv
->state
.style
->SecondaryColour
;
873 render_priv
->state
.c
[2] = render_priv
->state
.style
->OutlineColour
;
874 render_priv
->state
.c
[3] = render_priv
->state
.style
->BackColour
;
875 render_priv
->state
.flags
=
876 (render_priv
->state
.style
->Underline
? DECO_UNDERLINE
: 0) |
877 (render_priv
->state
.style
->StrikeOut
? DECO_STRIKETHROUGH
: 0);
878 render_priv
->state
.font_size
= render_priv
->state
.style
->FontSize
;
880 free(render_priv
->state
.family
);
881 render_priv
->state
.family
= NULL
;
882 render_priv
->state
.family
= strdup(render_priv
->state
.style
->FontName
);
883 render_priv
->state
.treat_family_as_pattern
=
884 render_priv
->state
.style
->treat_fontname_as_pattern
;
885 render_priv
->state
.bold
= render_priv
->state
.style
->Bold
;
886 render_priv
->state
.italic
= render_priv
->state
.style
->Italic
;
887 update_font(render_priv
);
889 change_border(render_priv
, -1., -1.);
890 render_priv
->state
.scale_x
= render_priv
->state
.style
->ScaleX
;
891 render_priv
->state
.scale_y
= render_priv
->state
.style
->ScaleY
;
892 render_priv
->state
.hspacing
= render_priv
->state
.style
->Spacing
;
893 render_priv
->state
.be
= 0;
894 render_priv
->state
.blur
= 0.0;
895 render_priv
->state
.shadow_x
= render_priv
->state
.style
->Shadow
;
896 render_priv
->state
.shadow_y
= render_priv
->state
.style
->Shadow
;
897 render_priv
->state
.frx
= render_priv
->state
.fry
= 0.;
898 render_priv
->state
.frz
= M_PI
* render_priv
->state
.style
->Angle
/ 180.;
899 render_priv
->state
.fax
= render_priv
->state
.fay
= 0.;
900 render_priv
->state
.wrap_style
= render_priv
->track
->WrapStyle
;
904 * \brief Start new event. Reset render_priv->state.
907 init_render_context(ASS_Renderer
*render_priv
, ASS_Event
*event
)
909 render_priv
->state
.event
= event
;
910 render_priv
->state
.style
= render_priv
->track
->styles
+ event
->Style
;
911 render_priv
->state
.parsed_tags
= 0;
913 reset_render_context(render_priv
);
915 render_priv
->state
.evt_type
= EVENT_NORMAL
;
916 render_priv
->state
.alignment
= render_priv
->state
.style
->Alignment
;
917 render_priv
->state
.pos_x
= 0;
918 render_priv
->state
.pos_y
= 0;
919 render_priv
->state
.org_x
= 0;
920 render_priv
->state
.org_y
= 0;
921 render_priv
->state
.have_origin
= 0;
922 render_priv
->state
.clip_x0
= 0;
923 render_priv
->state
.clip_y0
= 0;
924 render_priv
->state
.clip_x1
= render_priv
->track
->PlayResX
;
925 render_priv
->state
.clip_y1
= render_priv
->track
->PlayResY
;
926 render_priv
->state
.clip_mode
= 0;
927 render_priv
->state
.detect_collisions
= 1;
928 render_priv
->state
.fade
= 0;
929 render_priv
->state
.drawing_mode
= 0;
930 render_priv
->state
.effect_type
= EF_NONE
;
931 render_priv
->state
.effect_timing
= 0;
932 render_priv
->state
.effect_skip_timing
= 0;
933 render_priv
->state
.bm_run_id
= 0;
934 ass_drawing_free(render_priv
->state
.drawing
);
935 render_priv
->state
.drawing
= ass_drawing_new(render_priv
->library
,
936 render_priv
->ftlibrary
);
938 apply_transition_effects(render_priv
, event
);
941 static void free_render_context(ASS_Renderer
*render_priv
)
943 free(render_priv
->state
.family
);
944 ass_drawing_free(render_priv
->state
.drawing
);
946 render_priv
->state
.family
= NULL
;
947 render_priv
->state
.drawing
= NULL
;
951 * Replace the outline of a glyph by a contour which makes up a simple
954 static void draw_opaque_box(ASS_Renderer
*render_priv
, uint32_t ch
,
955 FT_Outline
*ol
, FT_Vector advance
, int sx
, int sy
)
957 int asc
= 0, desc
= 0;
960 double scale_y
= render_priv
->state
.scale_y
;
961 double scale_x
= render_priv
->state
.scale_x
;
968 asc
= render_priv
->state
.drawing
->asc
;
969 desc
= render_priv
->state
.drawing
->desc
;
971 ass_font_get_asc_desc(render_priv
->state
.font
, ch
, &asc
, &desc
);
976 // Emulate the WTFish behavior of VSFilter, i.e. double-scale
977 // the sizes of the opaque box.
978 adv
+= double_to_d6(render_priv
->state
.hspacing
* render_priv
->font_scale
984 desc
+= asc
* (scale_y
- 1.0);
986 FT_Vector points
[4] = {
987 { .x
= -sx
, .y
= asc
+ sy
},
988 { .x
= adv
+ sx
, .y
= asc
+ sy
},
989 { .x
= adv
+ sx
, .y
= -desc
- sy
},
990 { .x
= -sx
, .y
= -desc
- sy
},
993 FT_Outline_Done(render_priv
->ftlibrary
, ol
);
994 FT_Outline_New(render_priv
->ftlibrary
, 4, 1, ol
);
996 ol
->n_points
= ol
->n_contours
= 0;
997 for (i
= 0; i
< 4; i
++) {
998 ol
->points
[ol
->n_points
] = points
[i
];
999 ol
->tags
[ol
->n_points
++] = 1;
1001 ol
->contours
[ol
->n_contours
++] = ol
->n_points
- 1;
1005 * Stroke an outline glyph in x/y direction. Applies various fixups to get
1006 * around limitations of the FreeType stroker.
1008 static void stroke_outline(ASS_Renderer
*render_priv
, FT_Outline
*outline
,
1011 if (sx
<= 0 && sy
<= 0)
1014 fix_freetype_stroker(outline
, sx
, sy
);
1016 // Borders are equal; use the regular stroker
1017 if (sx
== sy
&& render_priv
->state
.stroker
) {
1019 unsigned n_points
, n_contours
;
1021 FT_StrokerBorder border
= FT_Outline_GetOutsideBorder(outline
);
1022 error
= FT_Stroker_ParseOutline(render_priv
->state
.stroker
, outline
, 0);
1024 ass_msg(render_priv
->library
, MSGL_WARN
,
1025 "FT_Stroker_ParseOutline failed, error: %d", error
);
1027 error
= FT_Stroker_GetBorderCounts(render_priv
->state
.stroker
, border
,
1028 &n_points
, &n_contours
);
1030 ass_msg(render_priv
->library
, MSGL_WARN
,
1031 "FT_Stroker_GetBorderCounts failed, error: %d", error
);
1033 FT_Outline_Done(render_priv
->ftlibrary
, outline
);
1034 FT_Outline_New(render_priv
->ftlibrary
, n_points
, n_contours
, outline
);
1035 outline
->n_points
= outline
->n_contours
= 0;
1036 FT_Stroker_ExportBorder(render_priv
->state
.stroker
, border
, outline
);
1038 // "Stroke" with the outline emboldener in two passes.
1039 // The outlines look uglier, but the emboldening never adds any points
1044 FT_Outline_New(render_priv
->ftlibrary
, outline
->n_points
,
1045 outline
->n_contours
, &nol
);
1046 FT_Outline_Copy(outline
, &nol
);
1048 FT_Outline_Embolden(outline
, sx
* 2);
1049 FT_Outline_Translate(outline
, -sx
, -sx
);
1050 FT_Outline_Embolden(&nol
, sy
* 2);
1051 FT_Outline_Translate(&nol
, -sy
, -sy
);
1053 for (i
= 0; i
< outline
->n_points
; i
++)
1054 outline
->points
[i
].y
= nol
.points
[i
].y
;
1056 FT_Outline_Done(render_priv
->ftlibrary
, &nol
);
1061 * \brief Prepare glyph hash
1064 fill_glyph_hash(ASS_Renderer
*priv
, OutlineHashKey
*outline_key
,
1067 if (info
->drawing
) {
1068 DrawingHashKey
*key
= &outline_key
->u
.drawing
;
1069 outline_key
->type
= OUTLINE_DRAWING
;
1070 key
->scale_x
= double_to_d16(info
->scale_x
);
1071 key
->scale_y
= double_to_d16(info
->scale_y
);
1072 key
->outline
.x
= double_to_d16(info
->border_x
);
1073 key
->outline
.y
= double_to_d16(info
->border_y
);
1074 key
->border_style
= priv
->state
.style
->BorderStyle
;
1075 key
->hash
= info
->drawing
->hash
;
1076 key
->text
= strdup(info
->drawing
->text
);
1077 key
->pbo
= info
->drawing
->pbo
;
1078 key
->scale
= info
->drawing
->scale
;
1080 GlyphHashKey
*key
= &outline_key
->u
.glyph
;
1081 outline_key
->type
= OUTLINE_GLYPH
;
1082 key
->font
= info
->font
;
1083 key
->size
= info
->font_size
;
1084 key
->face_index
= info
->face_index
;
1085 key
->glyph_index
= info
->glyph_index
;
1086 key
->bold
= info
->bold
;
1087 key
->italic
= info
->italic
;
1088 key
->scale_x
= double_to_d16(info
->scale_x
);
1089 key
->scale_y
= double_to_d16(info
->scale_y
);
1090 key
->outline
.x
= double_to_d16(info
->border_x
);
1091 key
->outline
.y
= double_to_d16(info
->border_y
);
1092 key
->flags
= info
->flags
;
1093 key
->border_style
= priv
->state
.style
->BorderStyle
;
1098 * \brief Get normal and outline (border) glyphs
1099 * \param info out: struct filled with extracted data
1100 * Tries to get both glyphs from cache.
1101 * If they can't be found, gets a glyph from font face, generates outline with FT_Stroker,
1102 * and add them to cache.
1103 * The glyphs are returned in info->glyph and info->outline_glyph
1106 get_outline_glyph(ASS_Renderer
*render_priv
, GlyphInfo
*info
)
1108 OutlineHashValue
*val
;
1111 memset(&info
->hash_key
, 0, sizeof(key
));
1113 fill_glyph_hash(render_priv
, &key
, info
);
1114 val
= ass_cache_get(render_priv
->cache
.outline_cache
, &key
);
1116 info
->hash_key
.u
.outline
.outline
= val
;
1117 info
->outline
= val
->outline
;
1118 info
->border
= val
->border
;
1119 info
->bbox
= val
->bbox_scaled
;
1120 if (info
->drawing
) {
1121 info
->cluster_advance
.x
= info
->advance
.x
= val
->advance
.x
;
1122 info
->cluster_advance
.y
= info
->advance
.y
= val
->advance
.y
;
1124 info
->asc
= val
->asc
;
1125 info
->desc
= val
->desc
;
1128 if (info
->drawing
) {
1129 ASS_Drawing
*drawing
= info
->drawing
;
1130 ass_drawing_hash(drawing
);
1131 if(!ass_drawing_parse(drawing
, 0))
1133 outline_copy(render_priv
->ftlibrary
, &drawing
->outline
,
1135 info
->cluster_advance
.x
= info
->advance
.x
= drawing
->advance
.x
;
1136 info
->cluster_advance
.y
= info
->advance
.y
= drawing
->advance
.y
;
1137 info
->asc
= drawing
->asc
;
1138 info
->desc
= drawing
->desc
;
1139 ass_drawing_free(drawing
);
1141 double size_scaled
= ensure_font_size(render_priv
,
1142 info
->font_size
* render_priv
->font_scale
);
1143 ass_font_set_size(info
->font
, size_scaled
);
1144 ass_font_set_transform(info
->font
, info
->scale_x
,
1145 info
->scale_y
, NULL
);
1146 // symbol might have been changed. re-get it.
1147 //if (info->face_index < 0)
1148 // ass_font_get_index(render_priv->fontconfig_priv, info->font,
1149 // info->symbol, &info->face_index, &info->glyph_index);
1151 ass_font_get_glyph(render_priv
->fontconfig_priv
, info
->font
,
1152 info
->symbol
, info
->face_index
, info
->glyph_index
,
1153 render_priv
->settings
.hinting
, info
->flags
);
1154 if (glyph
!= NULL
) {
1155 outline_copy(render_priv
->ftlibrary
,
1156 &((FT_OutlineGlyph
)glyph
)->outline
, &info
->outline
);
1157 //info->advance.x = d16_to_d6(glyph->advance.x);
1158 //info->advance.y = d16_to_d6(glyph->advance.y);
1159 FT_Done_Glyph(glyph
);
1160 ass_font_get_asc_desc(info
->font
, info
->symbol
,
1161 &info
->asc
, &info
->desc
);
1162 info
->asc
*= info
->scale_y
;
1163 info
->desc
*= info
->scale_y
;
1169 FT_Outline_Get_CBox(info
->outline
, &info
->bbox
);
1171 if (render_priv
->state
.style
->BorderStyle
== 3 &&
1172 (info
->border_x
> 0|| info
->border_y
> 0)) {
1173 outline_copy(render_priv
->ftlibrary
, info
->outline
, &info
->border
);
1174 draw_opaque_box(render_priv
, info
->symbol
, info
->border
,
1176 double_to_d6(info
->border_x
*
1177 render_priv
->border_scale
),
1178 double_to_d6(info
->border_y
*
1179 render_priv
->border_scale
));
1180 } else if ((info
->border_x
> 0 || info
->border_y
> 0)
1181 && double_to_d6(info
->scale_x
) && double_to_d6(info
->scale_y
)) {
1183 outline_copy(render_priv
->ftlibrary
, info
->outline
, &info
->border
);
1184 stroke_outline(render_priv
, info
->border
,
1185 double_to_d6(info
->border_x
* render_priv
->border_scale
),
1186 double_to_d6(info
->border_y
* render_priv
->border_scale
));
1189 memset(&v
, 0, sizeof(v
));
1190 v
.lib
= render_priv
->ftlibrary
;
1191 v
.outline
= info
->outline
;
1192 v
.border
= info
->border
;
1193 v
.advance
= info
->cluster_advance
;
1194 v
.bbox_scaled
= info
->bbox
;
1196 v
.desc
= info
->desc
;
1197 info
->hash_key
.u
.outline
.outline
=
1198 ass_cache_put(render_priv
->cache
.outline_cache
, &key
, &v
);
1203 * \brief Apply transformation to outline points of a glyph
1204 * Applies rotations given by frx, fry and frz and projects the points back
1205 * onto the screen plane.
1208 transform_3d_points(FT_Vector shift
, FT_Outline
*outline
, double frx
, double fry
,
1209 double frz
, double fax
, double fay
, double scale
,
1212 double sx
= sin(frx
);
1213 double sy
= sin(fry
);
1214 double sz
= sin(frz
);
1215 double cx
= cos(frx
);
1216 double cy
= cos(fry
);
1217 double cz
= cos(frz
);
1218 FT_Vector
*p
= outline
->points
;
1219 double x
, y
, z
, xx
, yy
, zz
;
1222 dist
= 20000 * scale
;
1223 for (i
= 0; i
< outline
->n_points
; i
++) {
1224 x
= (double) p
[i
].x
+ shift
.x
+ (fax
* (yshift
- p
[i
].y
));
1225 y
= (double) p
[i
].y
+ shift
.y
+ (-fay
* p
[i
].x
);
1228 xx
= x
* cz
+ y
* sz
;
1229 yy
= -(x
* sz
- y
* cz
);
1233 y
= yy
* cx
+ zz
* sx
;
1234 z
= yy
* sx
- zz
* cx
;
1236 xx
= x
* cy
+ z
* sy
;
1238 zz
= x
* sy
- z
* cy
;
1240 zz
= FFMAX(zz
, 1000 - dist
);
1242 x
= (xx
* dist
) / (zz
+ dist
);
1243 y
= (yy
* dist
) / (zz
+ dist
);
1244 p
[i
].x
= x
- shift
.x
+ 0.5;
1245 p
[i
].y
= y
- shift
.y
+ 0.5;
1250 * \brief Apply 3d transformation to several objects
1251 * \param shift FreeType vector
1252 * \param glyph FreeType glyph
1253 * \param glyph2 FreeType glyph
1254 * \param frx x-axis rotation angle
1255 * \param fry y-axis rotation angle
1256 * \param frz z-axis rotation angle
1257 * Rotates both glyphs by frx, fry and frz. Shift vector is added before rotation and subtracted after it.
1260 transform_3d(FT_Vector shift
, FT_Outline
*outline
, FT_Outline
*border
,
1261 double frx
, double fry
, double frz
, double fax
, double fay
,
1262 double scale
, int yshift
)
1266 if (frx
!= 0. || fry
!= 0. || frz
!= 0. || fax
!= 0. || fay
!= 0.) {
1268 transform_3d_points(shift
, outline
, frx
, fry
, frz
,
1269 fax
, fay
, scale
, yshift
);
1272 transform_3d_points(shift
, border
, frx
, fry
, frz
,
1273 fax
, fay
, scale
, yshift
);
1278 * \brief Get bitmaps for a glyph
1279 * \param info glyph info
1280 * Tries to get glyph bitmaps from bitmap cache.
1281 * If they can't be found, they are generated by rotating and rendering the glyph.
1282 * After that, bitmaps are added to the cache.
1283 * They are returned in info->bm (glyph), info->bm_o (outline) and info->bm_s (shadow).
1286 get_bitmap_glyph(ASS_Renderer
*render_priv
, GlyphInfo
*info
)
1288 BitmapHashValue
*val
;
1289 OutlineBitmapHashKey
*key
= &info
->hash_key
.u
.outline
;
1291 val
= ass_cache_get(render_priv
->cache
.bitmap_cache
, &info
->hash_key
);
1295 info
->bm_o
= val
->bm_o
;
1296 info
->bm_s
= val
->bm_s
;
1299 BitmapHashValue hash_val
;
1301 double fax_scaled
, fay_scaled
;
1302 info
->bm
= info
->bm_o
= info
->bm_s
= 0;
1303 if (info
->outline
&& info
->symbol
!= '\n' && info
->symbol
!= 0
1305 FT_Outline
*outline
, *border
;
1306 double scale_x
= render_priv
->font_scale_x
;
1308 outline_copy(render_priv
->ftlibrary
, info
->outline
, &outline
);
1309 outline_copy(render_priv
->ftlibrary
, info
->border
, &border
);
1310 // calculating rotation shift vector (from rotation origin to the glyph basepoint)
1311 shift
.x
= key
->shift_x
;
1312 shift
.y
= key
->shift_y
;
1313 fax_scaled
= info
->fax
*
1314 render_priv
->state
.scale_x
;
1315 fay_scaled
= info
->fay
* render_priv
->state
.scale_y
;
1317 transform_3d(shift
, outline
, border
,
1318 info
->frx
, info
->fry
, info
->frz
, fax_scaled
,
1319 fay_scaled
, render_priv
->font_scale
, info
->asc
);
1321 // PAR correction scaling
1322 FT_Matrix m
= { double_to_d16(scale_x
), 0,
1323 0, double_to_d16(1.0) };
1328 FT_Outline_Transform(outline
, &m
);
1329 FT_Outline_Translate(outline
, key
->advance
.x
, -key
->advance
.y
);
1333 FT_Outline_Transform(border
, &m
);
1334 FT_Outline_Translate(border
, key
->advance
.x
, -key
->advance
.y
);
1337 error
= outline_to_bitmap3(render_priv
->library
,
1338 render_priv
->synth_priv
,
1339 render_priv
->ftlibrary
,
1341 &info
->bm
, &info
->bm_o
,
1342 &info
->bm_s
, info
->be
,
1343 info
->blur
* render_priv
->border_scale
,
1345 render_priv
->state
.style
->BorderStyle
);
1349 // add bitmaps to cache
1350 hash_val
.bm_o
= info
->bm_o
;
1351 hash_val
.bm
= info
->bm
;
1352 hash_val
.bm_s
= info
->bm_s
;
1353 ass_cache_put(render_priv
->cache
.bitmap_cache
, &info
->hash_key
,
1356 outline_free(render_priv
->ftlibrary
, outline
);
1357 outline_free(render_priv
->ftlibrary
, border
);
1361 // VSFilter compatibility: invisible fill and no border?
1362 // In this case no shadow is supposed to be rendered.
1363 if (!info
->border
&& (info
->c
[0] & 0xFF) == 0xFF)
1368 * This function goes through text_info and calculates text parameters.
1369 * The following text_info fields are filled:
1375 static void measure_text(ASS_Renderer
*render_priv
)
1377 TextInfo
*text_info
= &render_priv
->text_info
;
1379 double max_asc
= 0., max_desc
= 0.;
1380 GlyphInfo
*last
= NULL
;
1383 text_info
->height
= 0.;
1384 for (i
= 0; i
< text_info
->length
+ 1; ++i
) {
1385 if ((i
== text_info
->length
) || text_info
->glyphs
[i
].linebreak
) {
1386 if (empty_line
&& cur_line
> 0 && last
&& i
< text_info
->length
) {
1387 max_asc
= d6_to_double(last
->asc
) / 2.0;
1388 max_desc
= d6_to_double(last
->desc
) / 2.0;
1390 text_info
->lines
[cur_line
].asc
= max_asc
;
1391 text_info
->lines
[cur_line
].desc
= max_desc
;
1392 text_info
->height
+= max_asc
+ max_desc
;
1394 max_asc
= max_desc
= 0.;
1398 if (i
< text_info
->length
) {
1399 GlyphInfo
*cur
= text_info
->glyphs
+ i
;
1400 if (d6_to_double(cur
->asc
) > max_asc
)
1401 max_asc
= d6_to_double(cur
->asc
);
1402 if (d6_to_double(cur
->desc
) > max_desc
)
1403 max_desc
= d6_to_double(cur
->desc
);
1404 if (cur
->symbol
!= '\n' && cur
->symbol
!= 0)
1408 text_info
->height
+=
1409 (text_info
->n_lines
-
1410 1) * render_priv
->settings
.line_spacing
;
1414 * Mark extra whitespace for later removal.
1416 #define IS_WHITESPACE(x) ((x->symbol == ' ' || x->symbol == '\n') \
1418 static void trim_whitespace(ASS_Renderer
*render_priv
)
1422 TextInfo
*ti
= &render_priv
->text_info
;
1424 // Mark trailing spaces
1426 cur
= ti
->glyphs
+ i
;
1427 while (i
&& IS_WHITESPACE(cur
)) {
1429 cur
= ti
->glyphs
+ --i
;
1432 // Mark leading whitespace
1435 while (i
< ti
->length
&& IS_WHITESPACE(cur
)) {
1437 cur
= ti
->glyphs
+ ++i
;
1440 // Mark all extraneous whitespace inbetween
1441 for (i
= 0; i
< ti
->length
; ++i
) {
1442 cur
= ti
->glyphs
+ i
;
1443 if (cur
->linebreak
) {
1444 // Mark whitespace before
1446 cur
= ti
->glyphs
+ j
;
1447 while (j
&& IS_WHITESPACE(cur
)) {
1449 cur
= ti
->glyphs
+ --j
;
1451 // A break itself can contain a whitespace, too
1452 cur
= ti
->glyphs
+ i
;
1453 if (cur
->symbol
== ' ') {
1455 // Mark whitespace after
1457 cur
= ti
->glyphs
+ j
;
1458 while (j
< ti
->length
&& IS_WHITESPACE(cur
)) {
1460 cur
= ti
->glyphs
+ ++j
;
1467 #undef IS_WHITESPACE
1470 * \brief rearrange text between lines
1471 * \param max_text_width maximal text line width in pixels
1472 * The algo is similar to the one in libvo/sub.c:
1473 * 1. Place text, wrapping it when current line is full
1474 * 2. Try moving words from the end of a line to the beginning of the next one while it reduces
1475 * the difference in lengths between this two lines.
1476 * The result may not be optimal, but usually is good enough.
1478 * FIXME: implement style 0 and 3 correctly
1481 wrap_lines_smart(ASS_Renderer
*render_priv
, double max_text_width
)
1484 GlyphInfo
*cur
, *s1
, *e1
, *s2
, *s3
, *w
;
1492 TextInfo
*text_info
= &render_priv
->text_info
;
1495 text_info
->n_lines
= 1;
1497 s1
= text_info
->glyphs
; // current line start
1498 for (i
= 0; i
< text_info
->length
; ++i
) {
1500 double s_offset
, len
;
1501 cur
= text_info
->glyphs
+ i
;
1502 s_offset
= d6_to_double(s1
->bbox
.xMin
+ s1
->pos
.x
);
1503 len
= d6_to_double(cur
->bbox
.xMax
+ cur
->pos
.x
) - s_offset
;
1505 if (cur
->symbol
== '\n') {
1508 ass_msg(render_priv
->library
, MSGL_DBG2
,
1509 "forced line break at %d", break_at
);
1510 } else if (cur
->symbol
== ' ') {
1512 } else if (len
>= max_text_width
1513 && (render_priv
->state
.wrap_style
!= 2)) {
1515 break_at
= last_space
;
1517 ass_msg(render_priv
->library
, MSGL_DBG2
, "line break at %d",
1521 if (break_at
!= -1) {
1522 // need to use one more line
1523 // marking break_at+1 as start of a new line
1524 int lead
= break_at
+ 1; // the first symbol of the new line
1525 if (text_info
->n_lines
>= text_info
->max_lines
) {
1526 // Raise maximum number of lines
1527 text_info
->max_lines
*= 2;
1528 text_info
->lines
= realloc(text_info
->lines
,
1530 text_info
->max_lines
);
1532 if (lead
< text_info
->length
)
1533 text_info
->glyphs
[lead
].linebreak
= break_type
;
1535 s1
= text_info
->glyphs
+ lead
;
1536 s_offset
= d6_to_double(s1
->bbox
.xMin
+ s1
->pos
.x
);
1537 text_info
->n_lines
++;
1540 #define DIFF(x,y) (((x) < (y)) ? (y - x) : (x - y))
1542 while (!exit
&& render_priv
->state
.wrap_style
!= 1) {
1544 w
= s3
= text_info
->glyphs
;
1546 for (i
= 0; i
<= text_info
->length
; ++i
) {
1547 cur
= text_info
->glyphs
+ i
;
1548 if ((i
== text_info
->length
) || cur
->linebreak
) {
1552 if (s1
&& (s2
->linebreak
== 1)) { // have at least 2 lines, and linebreak is 'soft'
1553 double l1
, l2
, l1_new
, l2_new
;
1558 } while ((w
> s1
) && (w
->symbol
== ' '));
1559 while ((w
> s1
) && (w
->symbol
!= ' ')) {
1563 while ((e1
> s1
) && (e1
->symbol
== ' ')) {
1566 if (w
->symbol
== ' ')
1569 l1
= d6_to_double(((s2
- 1)->bbox
.xMax
+ (s2
- 1)->pos
.x
) -
1570 (s1
->bbox
.xMin
+ s1
->pos
.x
));
1571 l2
= d6_to_double(((s3
- 1)->bbox
.xMax
+ (s3
- 1)->pos
.x
) -
1572 (s2
->bbox
.xMin
+ s2
->pos
.x
));
1573 l1_new
= d6_to_double(
1574 (e1
->bbox
.xMax
+ e1
->pos
.x
) -
1575 (s1
->bbox
.xMin
+ s1
->pos
.x
));
1576 l2_new
= d6_to_double(
1577 ((s3
- 1)->bbox
.xMax
+ (s3
- 1)->pos
.x
) -
1578 (w
->bbox
.xMin
+ w
->pos
.x
));
1580 if (DIFF(l1_new
, l2_new
) < DIFF(l1
, l2
)) {
1587 if (i
== text_info
->length
)
1592 assert(text_info
->n_lines
>= 1);
1595 measure_text(render_priv
);
1596 trim_whitespace(render_priv
);
1604 cur
= text_info
->glyphs
+ i
;
1605 while (i
< text_info
->length
&& cur
->skip
)
1606 cur
= text_info
->glyphs
+ ++i
;
1607 pen_shift_x
= d6_to_double(-cur
->pos
.x
);
1609 for (i
= 0; i
< text_info
->length
; ++i
) {
1610 cur
= text_info
->glyphs
+ i
;
1611 if (cur
->linebreak
) {
1612 while (i
< text_info
->length
&& cur
->skip
&& cur
->symbol
!= '\n')
1613 cur
= text_info
->glyphs
+ ++i
;
1615 text_info
->lines
[cur_line
- 1].desc
+
1616 text_info
->lines
[cur_line
].asc
;
1617 text_info
->lines
[cur_line
- 1].len
= i
-
1618 text_info
->lines
[cur_line
- 1].offset
;
1619 text_info
->lines
[cur_line
].offset
= i
;
1622 pen_shift_x
= d6_to_double(-cur
->pos
.x
);
1623 pen_shift_y
+= height
+ render_priv
->settings
.line_spacing
;
1624 ass_msg(render_priv
->library
, MSGL_DBG2
,
1625 "shifting from %d to %d by (%f, %f)", i
,
1626 text_info
->length
- 1, pen_shift_x
, pen_shift_y
);
1628 cur
->bm_run_id
+= run_offset
;
1629 cur
->pos
.x
+= double_to_d6(pen_shift_x
);
1630 cur
->pos
.y
+= double_to_d6(pen_shift_y
);
1632 text_info
->lines
[cur_line
- 1].len
=
1633 text_info
->length
- text_info
->lines
[cur_line
- 1].offset
;
1637 for (i
= 0; i
< text_info
->n_lines
; i
++) {
1638 printf("line %d offset %d length %d\n", i
, text_info
->lines
[i
].offset
,
1639 text_info
->lines
[i
].len
);
1645 * \brief Calculate base point for positioning and rotation
1646 * \param bbox text bbox
1647 * \param alignment alignment
1648 * \param bx, by out: base point coordinates
1650 static void get_base_point(DBBox
*bbox
, int alignment
, double *bx
, double *by
)
1652 const int halign
= alignment
& 3;
1653 const int valign
= alignment
& 12;
1660 *bx
= (bbox
->xMax
+ bbox
->xMin
) / 2.0;
1672 *by
= (bbox
->yMax
+ bbox
->yMin
) / 2.0;
1681 * Prepare bitmap hash key of a glyph
1684 fill_bitmap_hash(ASS_Renderer
*priv
, GlyphInfo
*info
,
1685 OutlineBitmapHashKey
*hash_key
)
1687 hash_key
->frx
= rot_key(info
->frx
);
1688 hash_key
->fry
= rot_key(info
->fry
);
1689 hash_key
->frz
= rot_key(info
->frz
);
1690 hash_key
->fax
= double_to_d16(info
->fax
);
1691 hash_key
->fay
= double_to_d16(info
->fay
);
1692 hash_key
->be
= info
->be
;
1693 hash_key
->blur
= info
->blur
;
1694 hash_key
->shadow_offset
.x
= double_to_d6(
1695 info
->shadow_x
* priv
->border_scale
-
1696 (int) (info
->shadow_x
* priv
->border_scale
));
1697 hash_key
->shadow_offset
.y
= double_to_d6(
1698 info
->shadow_y
* priv
->border_scale
-
1699 (int) (info
->shadow_y
* priv
->border_scale
));
1703 * \brief Main ass rendering function, glues everything together
1704 * \param event event to render
1705 * \param event_images struct containing resulting images, will also be initialized
1706 * Process event, appending resulting ASS_Image's to images_root.
1709 ass_render_event(ASS_Renderer
*render_priv
, ASS_Event
*event
,
1710 EventImages
*event_images
)
1719 int MarginL
, MarginR
, MarginV
;
1721 int alignment
, halign
, valign
;
1722 double device_x
= 0;
1723 double device_y
= 0;
1724 TextInfo
*text_info
= &render_priv
->text_info
;
1725 GlyphInfo
*glyphs
= render_priv
->text_info
.glyphs
;
1726 ASS_Drawing
*drawing
;
1728 if (event
->Style
>= render_priv
->track
->n_styles
) {
1729 ass_msg(render_priv
->library
, MSGL_WARN
, "No style found");
1733 ass_msg(render_priv
->library
, MSGL_WARN
, "Empty event");
1737 init_render_context(render_priv
, event
);
1739 drawing
= render_priv
->state
.drawing
;
1740 text_info
->length
= 0;
1746 // get next char, executing style override
1747 // this affects render_context
1749 code
= get_next_char(render_priv
, &p
);
1750 if (render_priv
->state
.drawing_mode
&& code
)
1751 ass_drawing_add_char(drawing
, (char) code
);
1752 } while (code
&& render_priv
->state
.drawing_mode
); // skip everything in drawing mode
1754 if (text_info
->length
>= text_info
->max_glyphs
) {
1755 // Raise maximum number of glyphs
1756 text_info
->max_glyphs
*= 2;
1757 text_info
->glyphs
= glyphs
=
1758 realloc(text_info
->glyphs
,
1759 sizeof(GlyphInfo
) * text_info
->max_glyphs
);
1762 // Clear current GlyphInfo
1763 memset(&glyphs
[text_info
->length
], 0, sizeof(GlyphInfo
));
1767 drawing
->scale_x
= render_priv
->state
.scale_x
*
1768 render_priv
->font_scale
;
1769 drawing
->scale_y
= render_priv
->state
.scale_y
*
1770 render_priv
->font_scale
;
1772 code
= 0xfffc; // object replacement character
1773 glyphs
[text_info
->length
].drawing
= drawing
;
1776 // face could have been changed in get_next_char
1777 if (!render_priv
->state
.font
) {
1778 free_render_context(render_priv
);
1785 // Fill glyph information
1786 glyphs
[text_info
->length
].symbol
= code
;
1787 glyphs
[text_info
->length
].font
= render_priv
->state
.font
;
1788 for (i
= 0; i
< 4; ++i
) {
1789 uint32_t clr
= render_priv
->state
.c
[i
];
1791 mult_alpha(_a(clr
), render_priv
->state
.fade
), 1.);
1792 glyphs
[text_info
->length
].c
[i
] = clr
;
1794 glyphs
[text_info
->length
].effect_type
= render_priv
->state
.effect_type
;
1795 glyphs
[text_info
->length
].effect_timing
=
1796 render_priv
->state
.effect_timing
;
1797 glyphs
[text_info
->length
].effect_skip_timing
=
1798 render_priv
->state
.effect_skip_timing
;
1799 glyphs
[text_info
->length
].font_size
= render_priv
->state
.font_size
;
1800 glyphs
[text_info
->length
].be
= render_priv
->state
.be
;
1801 glyphs
[text_info
->length
].blur
= render_priv
->state
.blur
;
1802 glyphs
[text_info
->length
].shadow_x
= render_priv
->state
.shadow_x
;
1803 glyphs
[text_info
->length
].shadow_y
= render_priv
->state
.shadow_y
;
1804 glyphs
[text_info
->length
].scale_x
= render_priv
->state
.scale_x
;
1805 glyphs
[text_info
->length
].scale_y
= render_priv
->state
.scale_y
;
1806 glyphs
[text_info
->length
].border_x
= render_priv
->state
.border_x
;
1807 glyphs
[text_info
->length
].border_y
= render_priv
->state
.border_y
;
1808 glyphs
[text_info
->length
].bold
= render_priv
->state
.bold
;
1809 glyphs
[text_info
->length
].italic
= render_priv
->state
.italic
;
1810 glyphs
[text_info
->length
].flags
= render_priv
->state
.flags
;
1811 glyphs
[text_info
->length
].frx
= render_priv
->state
.frx
;
1812 glyphs
[text_info
->length
].fry
= render_priv
->state
.fry
;
1813 glyphs
[text_info
->length
].frz
= render_priv
->state
.frz
;
1814 glyphs
[text_info
->length
].fax
= render_priv
->state
.fax
;
1815 glyphs
[text_info
->length
].fay
= render_priv
->state
.fay
;
1816 glyphs
[text_info
->length
].bm_run_id
= render_priv
->state
.bm_run_id
;
1818 if (glyphs
[text_info
->length
].drawing
) {
1819 drawing
= render_priv
->state
.drawing
=
1820 ass_drawing_new(render_priv
->library
, render_priv
->ftlibrary
);
1823 text_info
->length
++;
1825 render_priv
->state
.effect_type
= EF_NONE
;
1826 render_priv
->state
.effect_timing
= 0;
1827 render_priv
->state
.effect_skip_timing
= 0;
1831 if (text_info
->length
== 0) {
1832 // no valid symbols in the event; this can be smth like {comment}
1833 free_render_context(render_priv
);
1837 // Find shape runs and shape text
1838 ass_shaper_find_runs(render_priv
->shaper
, render_priv
, glyphs
,
1840 ass_shaper_shape(render_priv
->shaper
, text_info
);
1843 for (i
= 0; i
< text_info
->length
; i
++) {
1844 GlyphInfo
*info
= glyphs
+ i
;
1846 get_outline_glyph(render_priv
, info
);
1851 // add horizontal letter spacing
1852 info
->cluster_advance
.x
+= double_to_d6(render_priv
->state
.hspacing
*
1853 render_priv
->font_scale
* info
->scale_x
);
1855 // add displacement for vertical shearing
1856 info
->cluster_advance
.y
+= (info
->fay
* info
->scale_y
) * info
->cluster_advance
.x
;
1859 // Preliminary layout (for line wrapping)
1863 for (i
= 0; i
< text_info
->length
; i
++) {
1864 GlyphInfo
*info
= glyphs
+ i
;
1865 FT_Vector cluster_pen
= pen
;
1869 // Add additional space after italic to non-italic style changes
1870 if (i
&& glyphs
[i
- 1].italic
&& !info
->italic
) {
1872 GlyphInfo
*og
= &glyphs
[back
];
1873 while (back
&& og
->bbox
.xMax
- og
->bbox
.xMin
== 0
1875 og
= &glyphs
[--back
];
1876 if (og
->bbox
.xMax
> og
->advance
.x
) {
1877 // The FreeType oblique slants by 6/16
1878 pen
.x
+= og
->bbox
.yMax
* 0.375;
1883 info
->pos
.x
= cluster_pen
.x
;
1884 info
->pos
.y
= cluster_pen
.y
;
1886 cluster_pen
.x
+= info
->advance
.x
;
1887 cluster_pen
.y
+= info
->advance
.y
;
1890 info
->hash_key
.type
= BITMAP_OUTLINE
;
1891 fill_bitmap_hash(render_priv
, info
, &info
->hash_key
.u
.outline
);
1896 pen
.x
+= info
->cluster_advance
.x
;
1897 pen
.y
+= info
->cluster_advance
.y
;
1898 previous
= info
->symbol
;
1902 // depends on glyph x coordinates being monotonous, so it should be done before line wrap
1903 process_karaoke_effects(render_priv
);
1906 alignment
= render_priv
->state
.alignment
;
1907 halign
= alignment
& 3;
1908 valign
= alignment
& 12;
1911 (event
->MarginL
) ? event
->MarginL
: render_priv
->state
.style
->MarginL
;
1913 (event
->MarginR
) ? event
->MarginR
: render_priv
->state
.style
->MarginR
;
1915 (event
->MarginV
) ? event
->MarginV
: render_priv
->state
.style
->MarginV
;
1917 // calculate max length of a line
1918 double max_text_width
=
1919 x2scr(render_priv
, render_priv
->track
->PlayResX
- MarginR
) -
1920 x2scr(render_priv
, MarginL
);
1923 if (render_priv
->state
.evt_type
!= EVENT_HSCROLL
) {
1924 // rearrange text in several lines
1925 wrap_lines_smart(render_priv
, max_text_width
);
1927 // no breaking or wrapping, everything in a single line
1928 text_info
->lines
[0].offset
= 0;
1929 text_info
->lines
[0].len
= text_info
->length
;
1930 text_info
->n_lines
= 1;
1931 measure_text(render_priv
);
1934 // Reorder text into visual order
1935 FriBidiStrIndex
*cmap
= ass_shaper_reorder(render_priv
->shaper
, text_info
);
1937 // Reposition according to the map
1941 for (i
= 0; i
< text_info
->length
; i
++) {
1942 GlyphInfo
*info
= glyphs
+ cmap
[i
];
1943 if (glyphs
[i
].linebreak
) {
1945 pen
.y
+= double_to_d6(text_info
->lines
[lineno
-1].desc
);
1946 pen
.y
+= double_to_d6(text_info
->lines
[lineno
].asc
);
1947 pen
.y
+= double_to_d6(render_priv
->settings
.line_spacing
);
1950 if (info
->skip
) continue;
1951 FT_Vector cluster_pen
= pen
;
1953 info
->pos
.x
= info
->offset
.x
+ cluster_pen
.x
;
1954 info
->pos
.y
= info
->offset
.y
+ cluster_pen
.y
;
1955 cluster_pen
.x
+= info
->advance
.x
;
1956 cluster_pen
.y
+= info
->advance
.y
;
1959 info
= glyphs
+ cmap
[i
];
1960 pen
.x
+= info
->cluster_advance
.x
;
1961 pen
.y
+= info
->cluster_advance
.y
;
1965 if (render_priv
->state
.evt_type
!= EVENT_HSCROLL
) {
1968 for (i
= 0; i
<= text_info
->length
; ++i
) { // (text_info->length + 1) is the end of the last line
1969 if ((i
== text_info
->length
) || glyphs
[i
].linebreak
) {
1970 // remove letter spacing (which is included in cluster_advance)
1972 width
-= render_priv
->state
.hspacing
* render_priv
->font_scale
*
1973 glyphs
[i
-1].scale_x
;
1975 if (halign
== HALIGN_LEFT
) { // left aligned, no action
1977 } else if (halign
== HALIGN_RIGHT
) { // right aligned
1978 shift
= max_text_width
- width
;
1979 } else if (halign
== HALIGN_CENTER
) { // centered
1980 shift
= (max_text_width
- width
) / 2.0;
1982 for (j
= last_break
+ 1; j
< i
; ++j
) {
1983 GlyphInfo
*info
= glyphs
+ j
;
1985 info
->pos
.x
+= double_to_d6(shift
);
1992 if (i
< text_info
->length
&& !glyphs
[i
].skip
&&
1993 glyphs
[i
].symbol
!= '\n' && glyphs
[i
].symbol
!= 0) {
1994 width
+= d6_to_double(glyphs
[i
].cluster_advance
.x
);
1999 // determing text bounding box
2000 compute_string_bbox(text_info
, &bbox
);
2002 // determine device coordinates for text
2004 // x coordinate for everything except positioned events
2005 if (render_priv
->state
.evt_type
== EVENT_NORMAL
||
2006 render_priv
->state
.evt_type
== EVENT_VSCROLL
) {
2007 device_x
= x2scr(render_priv
, MarginL
);
2008 } else if (render_priv
->state
.evt_type
== EVENT_HSCROLL
) {
2009 if (render_priv
->state
.scroll_direction
== SCROLL_RL
)
2012 render_priv
->track
->PlayResX
-
2013 render_priv
->state
.scroll_shift
);
2014 else if (render_priv
->state
.scroll_direction
== SCROLL_LR
)
2017 render_priv
->state
.scroll_shift
) - (bbox
.xMax
-
2021 // y coordinate for everything except positioned events
2022 if (render_priv
->state
.evt_type
== EVENT_NORMAL
||
2023 render_priv
->state
.evt_type
== EVENT_HSCROLL
) {
2024 if (valign
== VALIGN_TOP
) { // toptitle
2026 y2scr_top(render_priv
,
2027 MarginV
) + text_info
->lines
[0].asc
;
2028 } else if (valign
== VALIGN_CENTER
) { // midtitle
2030 y2scr(render_priv
, render_priv
->track
->PlayResY
/ 2.0);
2031 device_y
= scr_y
- (bbox
.yMax
+ bbox
.yMin
) / 2.0;
2032 } else { // subtitle
2034 if (valign
!= VALIGN_SUB
)
2035 ass_msg(render_priv
->library
, MSGL_V
,
2036 "Invalid valign, assuming 0 (subtitle)");
2038 y2scr_sub(render_priv
,
2039 render_priv
->track
->PlayResY
- MarginV
);
2041 device_y
-= text_info
->height
;
2042 device_y
+= text_info
->lines
[0].asc
;
2044 } else if (render_priv
->state
.evt_type
== EVENT_VSCROLL
) {
2045 if (render_priv
->state
.scroll_direction
== SCROLL_TB
)
2048 render_priv
->state
.clip_y0
+
2049 render_priv
->state
.scroll_shift
) - (bbox
.yMax
-
2051 else if (render_priv
->state
.scroll_direction
== SCROLL_BT
)
2054 render_priv
->state
.clip_y1
-
2055 render_priv
->state
.scroll_shift
);
2058 // positioned events are totally different
2059 if (render_priv
->state
.evt_type
== EVENT_POSITIONED
) {
2062 ass_msg(render_priv
->library
, MSGL_DBG2
, "positioned event at %f, %f",
2063 render_priv
->state
.pos_x
, render_priv
->state
.pos_y
);
2064 get_base_point(&bbox
, alignment
, &base_x
, &base_y
);
2066 x2scr_pos(render_priv
, render_priv
->state
.pos_x
) - base_x
;
2068 y2scr_pos(render_priv
, render_priv
->state
.pos_y
) - base_y
;
2071 // fix clip coordinates (they depend on alignment)
2072 if (render_priv
->state
.evt_type
== EVENT_NORMAL
||
2073 render_priv
->state
.evt_type
== EVENT_HSCROLL
||
2074 render_priv
->state
.evt_type
== EVENT_VSCROLL
) {
2075 render_priv
->state
.clip_x0
=
2076 x2scr_scaled(render_priv
, render_priv
->state
.clip_x0
);
2077 render_priv
->state
.clip_x1
=
2078 x2scr_scaled(render_priv
, render_priv
->state
.clip_x1
);
2079 if (valign
== VALIGN_TOP
) {
2080 render_priv
->state
.clip_y0
=
2081 y2scr_top(render_priv
, render_priv
->state
.clip_y0
);
2082 render_priv
->state
.clip_y1
=
2083 y2scr_top(render_priv
, render_priv
->state
.clip_y1
);
2084 } else if (valign
== VALIGN_CENTER
) {
2085 render_priv
->state
.clip_y0
=
2086 y2scr(render_priv
, render_priv
->state
.clip_y0
);
2087 render_priv
->state
.clip_y1
=
2088 y2scr(render_priv
, render_priv
->state
.clip_y1
);
2089 } else if (valign
== VALIGN_SUB
) {
2090 render_priv
->state
.clip_y0
=
2091 y2scr_sub(render_priv
, render_priv
->state
.clip_y0
);
2092 render_priv
->state
.clip_y1
=
2093 y2scr_sub(render_priv
, render_priv
->state
.clip_y1
);
2095 } else if (render_priv
->state
.evt_type
== EVENT_POSITIONED
) {
2096 render_priv
->state
.clip_x0
=
2097 x2scr_pos_scaled(render_priv
, render_priv
->state
.clip_x0
);
2098 render_priv
->state
.clip_x1
=
2099 x2scr_pos_scaled(render_priv
, render_priv
->state
.clip_x1
);
2100 render_priv
->state
.clip_y0
=
2101 y2scr_pos(render_priv
, render_priv
->state
.clip_y0
);
2102 render_priv
->state
.clip_y1
=
2103 y2scr_pos(render_priv
, render_priv
->state
.clip_y1
);
2106 // calculate rotation parameters
2110 if (render_priv
->state
.have_origin
) {
2111 center
.x
= x2scr(render_priv
, render_priv
->state
.org_x
);
2112 center
.y
= y2scr(render_priv
, render_priv
->state
.org_y
);
2114 double bx
= 0., by
= 0.;
2115 get_base_point(&bbox
, alignment
, &bx
, &by
);
2116 center
.x
= device_x
+ bx
;
2117 center
.y
= device_y
+ by
;
2120 for (i
= 0; i
< text_info
->length
; ++i
) {
2121 GlyphInfo
*info
= glyphs
+ i
;
2123 OutlineBitmapHashKey
*key
= &info
->hash_key
.u
.outline
;
2125 if (key
->frx
|| key
->fry
|| key
->frz
|| key
->fax
|| key
->fay
) {
2126 key
->shift_x
= info
->pos
.x
+ double_to_d6(device_x
- center
.x
);
2127 key
->shift_y
= -(info
->pos
.y
+ double_to_d6(device_y
- center
.y
));
2137 // convert glyphs to bitmaps
2138 device_x
*= render_priv
->font_scale_x
;
2139 for (i
= 0; i
< text_info
->length
; ++i
) {
2140 GlyphInfo
*info
= glyphs
+ i
;
2142 OutlineBitmapHashKey
*key
= &info
->hash_key
.u
.outline
;
2143 info
->pos
.x
*= render_priv
->font_scale_x
;
2145 double_to_d6(device_x
- (int) device_x
+
2146 d6_to_double(info
->pos
.x
& SUBPIXEL_MASK
)) & ~SUBPIXEL_ACCURACY
;
2148 double_to_d6(device_y
- (int) device_y
+
2149 d6_to_double(info
->pos
.y
& SUBPIXEL_MASK
)) & ~SUBPIXEL_ACCURACY
;
2150 get_bitmap_glyph(render_priv
, info
);
2156 // Compute runs and their bboxes
2157 // XXX: currently does nothing visible/functional
2158 for (i
= 0; i
< text_info
->length
; i
++) {
2159 GlyphInfo
*g
= glyphs
+ i
;
2160 OutlineBitmapHashKey
*key
= &g
->hash_key
.u
.outline
;
2163 // skip non-visual glyphs
2164 if (g
->skip
|| g
->symbol
== '\n' || g
->symbol
== 0)
2167 // Determine run length and compute run bbox
2169 int cur_run
= g
->bm_run_id
;
2170 while (g
->bm_run_id
== cur_run
&& (i
+ run_len
) < text_info
->length
) {
2175 compute_run_size(g
, run_len
, &w
, &h
);
2176 //printf("run_id %d len %d size %d %d\n", g->bm_run_id, run_len, w, h);
2182 memset(event_images
, 0, sizeof(*event_images
));
2183 event_images
->top
= device_y
- text_info
->lines
[0].asc
;
2184 event_images
->height
= text_info
->height
;
2185 event_images
->left
=
2186 (device_x
+ bbox
.xMin
* render_priv
->font_scale_x
) + 0.5;
2187 event_images
->width
=
2188 (bbox
.xMax
- bbox
.xMin
) * render_priv
->font_scale_x
+ 0.5;
2189 event_images
->detect_collisions
= render_priv
->state
.detect_collisions
;
2190 event_images
->shift_direction
= (valign
== VALIGN_TOP
) ? 1 : -1;
2191 event_images
->event
= event
;
2192 event_images
->imgs
= render_text(render_priv
, (int) device_x
, (int) device_y
);
2194 ass_shaper_cleanup(render_priv
->shaper
, text_info
);
2195 free_render_context(render_priv
);
2201 * \brief deallocate image list
2202 * \param img list pointer
2204 void ass_free_images(ASS_Image
*img
)
2207 ASS_Image
*next
= img
->next
;
2214 * \brief Check cache limits and reset cache if they are exceeded
2216 static void check_cache_limits(ASS_Renderer
*priv
, CacheStore
*cache
)
2218 if (ass_cache_empty(cache
->bitmap_cache
, cache
->bitmap_max_size
)) {
2219 ass_cache_empty(cache
->composite_cache
, 0);
2220 ass_free_images(priv
->prev_images_root
);
2221 priv
->prev_images_root
= 0;
2223 if (ass_cache_empty(cache
->outline_cache
, cache
->glyph_max
)) {
2224 ass_cache_empty(cache
->bitmap_cache
, 0);
2225 ass_cache_empty(cache
->composite_cache
, 0);
2226 ass_free_images(priv
->prev_images_root
);
2227 priv
->prev_images_root
= 0;
2232 * \brief Start a new frame
2235 ass_start_frame(ASS_Renderer
*render_priv
, ASS_Track
*track
,
2238 ASS_Settings
*settings_priv
= &render_priv
->settings
;
2240 if (!render_priv
->settings
.frame_width
2241 && !render_priv
->settings
.frame_height
)
2242 return 1; // library not initialized
2244 if (render_priv
->library
!= track
->library
)
2247 if (!render_priv
->fontconfig_priv
)
2250 free_list_clear(render_priv
);
2252 if (track
->n_events
== 0)
2253 return 1; // nothing to do
2255 render_priv
->track
= track
;
2256 render_priv
->time
= now
;
2258 ass_lazy_track_init(render_priv
->library
, render_priv
->track
);
2260 render_priv
->font_scale
= settings_priv
->font_size_coeff
*
2261 render_priv
->orig_height
/ render_priv
->track
->PlayResY
;
2262 if (render_priv
->track
->ScaledBorderAndShadow
)
2263 render_priv
->border_scale
=
2264 ((double) render_priv
->orig_height
) /
2265 render_priv
->track
->PlayResY
;
2267 render_priv
->border_scale
= 1.;
2269 ass_shaper_set_kerning(render_priv
->shaper
, track
->Kerning
);
2272 render_priv
->font_scale_x
= render_priv
->settings
.aspect
/
2273 render_priv
->settings
.storage_aspect
;
2275 render_priv
->prev_images_root
= render_priv
->images_root
;
2276 render_priv
->images_root
= 0;
2278 check_cache_limits(render_priv
, &render_priv
->cache
);
2283 static int cmp_event_layer(const void *p1
, const void *p2
)
2285 ASS_Event
*e1
= ((EventImages
*) p1
)->event
;
2286 ASS_Event
*e2
= ((EventImages
*) p2
)->event
;
2287 if (e1
->Layer
< e2
->Layer
)
2289 if (e1
->Layer
> e2
->Layer
)
2291 if (e1
->ReadOrder
< e2
->ReadOrder
)
2293 if (e1
->ReadOrder
> e2
->ReadOrder
)
2298 static ASS_RenderPriv
*get_render_priv(ASS_Renderer
*render_priv
,
2301 if (!event
->render_priv
)
2302 event
->render_priv
= calloc(1, sizeof(ASS_RenderPriv
));
2303 if (render_priv
->render_id
!= event
->render_priv
->render_id
) {
2304 memset(event
->render_priv
, 0, sizeof(ASS_RenderPriv
));
2305 event
->render_priv
->render_id
= render_priv
->render_id
;
2308 return event
->render_priv
;
2311 static int overlap(Segment
*s1
, Segment
*s2
)
2313 if (s1
->a
>= s2
->b
|| s2
->a
>= s1
->b
||
2314 s1
->ha
>= s2
->hb
|| s2
->ha
>= s1
->hb
)
2319 static int cmp_segment(const void *p1
, const void *p2
)
2321 return ((Segment
*) p1
)->a
- ((Segment
*) p2
)->a
;
2325 shift_event(ASS_Renderer
*render_priv
, EventImages
*ei
, int shift
)
2327 ASS_Image
*cur
= ei
->imgs
;
2329 cur
->dst_y
+= shift
;
2330 // clip top and bottom
2331 if (cur
->dst_y
< 0) {
2332 int clip
= -cur
->dst_y
;
2334 cur
->bitmap
+= clip
* cur
->stride
;
2337 if (cur
->dst_y
+ cur
->h
>= render_priv
->height
) {
2338 int clip
= cur
->dst_y
+ cur
->h
- render_priv
->height
;
2350 // dir: 1 - move down
2352 static int fit_segment(Segment
*s
, Segment
*fixed
, int *cnt
, int dir
)
2357 if (dir
== 1) // move down
2358 for (i
= 0; i
< *cnt
; ++i
) {
2359 if (s
->b
+ shift
<= fixed
[i
].a
|| s
->a
+ shift
>= fixed
[i
].b
||
2360 s
->hb
<= fixed
[i
].ha
|| s
->ha
>= fixed
[i
].hb
)
2362 shift
= fixed
[i
].b
- s
->a
;
2363 } else // dir == -1, move up
2364 for (i
= *cnt
- 1; i
>= 0; --i
) {
2365 if (s
->b
+ shift
<= fixed
[i
].a
|| s
->a
+ shift
>= fixed
[i
].b
||
2366 s
->hb
<= fixed
[i
].ha
|| s
->ha
>= fixed
[i
].hb
)
2368 shift
= fixed
[i
].a
- s
->b
;
2371 fixed
[*cnt
].a
= s
->a
+ shift
;
2372 fixed
[*cnt
].b
= s
->b
+ shift
;
2373 fixed
[*cnt
].ha
= s
->ha
;
2374 fixed
[*cnt
].hb
= s
->hb
;
2376 qsort(fixed
, *cnt
, sizeof(Segment
), cmp_segment
);
2382 fix_collisions(ASS_Renderer
*render_priv
, EventImages
*imgs
, int cnt
)
2384 Segment
*used
= malloc(cnt
* sizeof(*used
));
2388 // fill used[] with fixed events
2389 for (i
= 0; i
< cnt
; ++i
) {
2390 ASS_RenderPriv
*priv
;
2391 if (!imgs
[i
].detect_collisions
)
2393 priv
= get_render_priv(render_priv
, imgs
[i
].event
);
2394 if (priv
->height
> 0) { // it's a fixed event
2397 s
.b
= priv
->top
+ priv
->height
;
2399 s
.hb
= priv
->left
+ priv
->width
;
2400 if (priv
->height
!= imgs
[i
].height
) { // no, it's not
2401 ass_msg(render_priv
->library
, MSGL_WARN
,
2402 "Event height has changed");
2408 for (j
= 0; j
< cnt_used
; ++j
)
2409 if (overlap(&s
, used
+ j
)) { // no, it's not
2415 if (priv
->height
> 0) { // still a fixed event
2416 used
[cnt_used
].a
= priv
->top
;
2417 used
[cnt_used
].b
= priv
->top
+ priv
->height
;
2418 used
[cnt_used
].ha
= priv
->left
;
2419 used
[cnt_used
].hb
= priv
->left
+ priv
->width
;
2421 shift_event(render_priv
, imgs
+ i
, priv
->top
- imgs
[i
].top
);
2425 qsort(used
, cnt_used
, sizeof(Segment
), cmp_segment
);
2427 // try to fit other events in free spaces
2428 for (i
= 0; i
< cnt
; ++i
) {
2429 ASS_RenderPriv
*priv
;
2430 if (!imgs
[i
].detect_collisions
)
2432 priv
= get_render_priv(render_priv
, imgs
[i
].event
);
2433 if (priv
->height
== 0) { // not a fixed event
2437 s
.b
= imgs
[i
].top
+ imgs
[i
].height
;
2438 s
.ha
= imgs
[i
].left
;
2439 s
.hb
= imgs
[i
].left
+ imgs
[i
].width
;
2440 shift
= fit_segment(&s
, used
, &cnt_used
, imgs
[i
].shift_direction
);
2442 shift_event(render_priv
, imgs
+ i
, shift
);
2444 priv
->top
= imgs
[i
].top
;
2445 priv
->height
= imgs
[i
].height
;
2446 priv
->left
= imgs
[i
].left
;
2447 priv
->width
= imgs
[i
].width
;
2456 * \brief compare two images
2457 * \param i1 first image
2458 * \param i2 second image
2459 * \return 0 if identical, 1 if different positions, 2 if different content
2461 static int ass_image_compare(ASS_Image
*i1
, ASS_Image
*i2
)
2467 if (i1
->stride
!= i2
->stride
)
2469 if (i1
->color
!= i2
->color
)
2471 if (i1
->bitmap
!= i2
->bitmap
)
2473 if (i1
->dst_x
!= i2
->dst_x
)
2475 if (i1
->dst_y
!= i2
->dst_y
)
2481 * \brief compare current and previous image list
2482 * \param priv library handle
2483 * \return 0 if identical, 1 if different positions, 2 if different content
2485 static int ass_detect_change(ASS_Renderer
*priv
)
2487 ASS_Image
*img
, *img2
;
2490 img
= priv
->prev_images_root
;
2491 img2
= priv
->images_root
;
2493 while (img
&& diff
< 2) {
2494 ASS_Image
*next
, *next2
;
2497 int d
= ass_image_compare(img
, img2
);
2502 // previous list is shorter
2510 // is the previous list longer?
2518 * \brief render a frame
2519 * \param priv library handle
2520 * \param track track
2521 * \param now current video timestamp (ms)
2522 * \param detect_change a value describing how the new images differ from the previous ones will be written here:
2523 * 0 if identical, 1 if different positions, 2 if different content.
2524 * Can be NULL, in that case no detection is performed.
2526 ASS_Image
*ass_render_frame(ASS_Renderer
*priv
, ASS_Track
*track
,
2527 long long now
, int *detect_change
)
2534 rc
= ass_start_frame(priv
, track
, now
);
2538 // render events separately
2540 for (i
= 0; i
< track
->n_events
; ++i
) {
2541 ASS_Event
*event
= track
->events
+ i
;
2542 if ((event
->Start
<= now
)
2543 && (now
< (event
->Start
+ event
->Duration
))) {
2544 if (cnt
>= priv
->eimg_size
) {
2545 priv
->eimg_size
+= 100;
2548 priv
->eimg_size
* sizeof(EventImages
));
2550 rc
= ass_render_event(priv
, event
, priv
->eimg
+ cnt
);
2557 qsort(priv
->eimg
, cnt
, sizeof(EventImages
), cmp_event_layer
);
2559 // call fix_collisions for each group of events with the same layer
2561 for (i
= 1; i
< cnt
; ++i
)
2562 if (last
->event
->Layer
!= priv
->eimg
[i
].event
->Layer
) {
2563 fix_collisions(priv
, last
, priv
->eimg
+ i
- last
);
2564 last
= priv
->eimg
+ i
;
2567 fix_collisions(priv
, last
, priv
->eimg
+ cnt
- last
);
2570 tail
= &priv
->images_root
;
2571 for (i
= 0; i
< cnt
; ++i
) {
2572 ASS_Image
*cur
= priv
->eimg
[i
].imgs
;
2581 *detect_change
= ass_detect_change(priv
);
2583 // free the previous image list
2584 ass_free_images(priv
->prev_images_root
);
2585 priv
->prev_images_root
= 0;
2587 return priv
->images_root
;