2 * Copyright (C) 2006 Evgeniy Stepanov <eugeni.stepanov@gmail.com>
3 * Copyright (C) 2009 Grigori Goronzy <greg@geekmind.org>
5 * This file is part of libass.
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20 #ifndef LIBASS_RENDER_H
21 #define LIBASS_RENDER_H
25 #include FT_FREETYPE_H
28 #include FT_SYNTHESIS_H
32 #include "ass_bitmap.h"
33 #include "ass_cache.h"
34 #include "ass_utils.h"
35 #include "ass_fontconfig.h"
36 #include "ass_library.h"
37 #include "ass_drawing.h"
39 #define GLYPH_CACHE_MAX 1000
40 #define BITMAP_CACHE_MAX_SIZE 30 * 1048576
42 #define PARSED_FADE (1<<0)
43 #define PARSED_A (1<<1)
57 typedef struct free_list {
59 struct free_list *next;
65 double font_size_coeff; // font size multiplier
66 double line_spacing; // additional line spacing (in frame pixels)
67 int top_margin; // height of top margin. Everything except toptitles is shifted down by top_margin.
68 int bottom_margin; // height of bottom margin. (frame_height - top_margin - bottom_margin) is original video height.
71 int use_margins; // 0 - place all subtitles inside original frame
72 // 1 - use margins for placing toptitles and subtitles
73 double aspect; // frame aspect ratio, d_width / d_height.
74 double storage_aspect; // pixel ratio of the source image
84 int top, height, left, width;
85 int detect_collisions;
98 // GlyphInfo and TextInfo are used for text centering and word-wrapping operations
99 typedef struct glyph_info {
101 unsigned skip; // skip glyph when layouting text
106 ASS_Drawing *drawing;
109 Bitmap *bm; // glyph bitmap
110 Bitmap *bm_o; // outline bitmap
111 Bitmap *bm_s; // shadow bitmap
115 char linebreak; // the first (leading) glyph of some line ?
116 uint32_t c[4]; // colors
117 FT_Vector advance; // 26.6
119 int effect_timing; // time duration of current karaoke word
120 // after process_karaoke_effects: distance in pixels from the glyph origin.
121 // part of the glyph to the left of it is displayed in a different color.
122 int effect_skip_timing; // delay after the end of last karaoke word
123 int asc, desc; // font max ascender and descender
124 int be; // blur edges
125 double blur; // gaussian blur
128 double frx, fry, frz; // rotation
129 double fax, fay; // text shearing
130 double scale_x, scale_y;
131 double border_x, border_y;
139 BitmapHashKey hash_key;
141 // next glyph in this cluster
142 struct glyph_info *next;
161 // Values like current font face, color, screen position, clipping and so on are stored here.
169 int flags; // decoration flags (underline/strike-through)
172 int alignment; // alignment overrides go here; if zero, style value will be used
173 double frx, fry, frz;
174 double fax, fay; // text shearing
176 EVENT_NORMAL, // "normal" top-, sub- or mid- title
177 EVENT_POSITIONED, // happens after pos(,), margins are ignored
178 EVENT_HSCROLL, // "Banner" transition effect, text_width is unlimited
179 EVENT_VSCROLL // "Scroll up", "Scroll down" transition effects
181 double pos_x, pos_y; // position
182 double org_x, org_y; // origin
183 char have_origin; // origin is explicitly defined; if 0, get_base_point() is used
184 double scale_x, scale_y;
185 double hspacing; // distance between letters, in pixels
186 double border_x; // outline width
188 uint32_t c[4]; // colors(Primary, Secondary, so on) in RGBA
189 int clip_x0, clip_y0, clip_x1, clip_y1;
190 char clip_mode; // 1 = iclip
191 char detect_collisions;
192 uint32_t fade; // alpha from \fad
193 char be; // blur edges
194 double blur; // gaussian blur
197 int drawing_mode; // not implemented; when != 0 text is discarded, except for style override tags
198 ASS_Drawing *drawing; // current drawing
199 ASS_Drawing *clip_drawing; // clip vector
200 int clip_drawing_mode; // 0 = regular clip, 1 = inverse clip
204 int effect_skip_timing;
206 // bitmap run id (used for final bitmap rendering)
210 SCROLL_LR, // left-to-right
212 SCROLL_TB, // top-to-bottom
214 } scroll_direction; // for EVENT_HSCROLL, EVENT_VSCROLL
221 int treat_family_as_pattern;
227 Cache *outline_cache;
229 Cache *composite_cache;
231 size_t bitmap_max_size;
234 struct ass_renderer {
235 ASS_Library *library;
236 FT_Library ftlibrary;
237 FCInstance *fontconfig_priv;
238 ASS_Settings settings;
240 ASS_SynthPriv *synth_priv;
242 ASS_Image *images_root; // rendering result is stored here
243 ASS_Image *prev_images_root;
245 EventImages *eimg; // temporary buffer for sorting rendered events
246 int eimg_size; // allocated buffer size
249 int width, height; // screen dimensions
250 int orig_height; // frame height ( = screen height - margins )
251 int orig_width; // frame width ( = screen width - margins )
252 int orig_height_nocrop; // frame height ( = screen height - margins + cropheight)
253 int orig_width_nocrop; // frame width ( = screen width - margins + cropwidth)
255 long long time; // frame's timestamp, ms
257 double font_scale_x; // x scale applied to all glyphs to preserve text aspect ratio
268 typedef struct render_priv {
269 int top, height, left, width;
281 int a, b; // top and height
282 int ha, hb; // left and width
285 void reset_render_context(ASS_Renderer *render_priv);
286 void ass_free_images(ASS_Image *img);
288 // XXX: this is actually in ass.c, includes should be fixed later on
289 void ass_lazy_track_init(ASS_Library *lib, ASS_Track *track);
291 #endif /* LIBASS_RENDER_H */