/* * Copyright (C) 2006 Evgeniy Stepanov * Copyright (C) 2009 Grigori Goronzy * * This file is part of libass. * * libass is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * libass is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with libass; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #ifndef LIBASS_RENDER_H #define LIBASS_RENDER_H #include #include #include FT_FREETYPE_H #include FT_STROKER_H #include FT_GLYPH_H #include FT_SYNTHESIS_H #include "ass.h" #include "ass_font.h" #include "ass_bitmap.h" #include "ass_cache.h" #include "ass_utils.h" #include "ass_fontconfig.h" #include "ass_library.h" #include "ass_drawing.h" typedef struct { double xMin; double xMax; double yMin; double yMax; } DBBox; typedef struct { double x; double y; } DVector; typedef struct free_list { void *object; struct free_list *next; } FreeList; typedef struct { int frame_width; int frame_height; double font_size_coeff; // font size multiplier double line_spacing; // additional line spacing (in frame pixels) int top_margin; // height of top margin. Everything except toptitles is shifted down by top_margin. int bottom_margin; // height of bottom margin. (frame_height - top_margin - bottom_margin) is original video height. int left_margin; int right_margin; int use_margins; // 0 - place all subtitles inside original frame // 1 - use margins for placing toptitles and subtitles double aspect; // frame aspect ratio, d_width / d_height. double storage_aspect; // pixel ratio of the source image ASS_Hinting hinting; char *default_font; char *default_family; } ASS_Settings; // a rendered event typedef struct { ASS_Image *imgs; int top, height, left, width; int detect_collisions; int shift_direction; ASS_Event *event; } EventImages; typedef enum { EF_NONE = 0, EF_KARAOKE, EF_KARAOKE_KF, EF_KARAOKE_KO } Effect; // describes a glyph // GlyphInfo and TextInfo are used for text centering and word-wrapping operations typedef struct { unsigned symbol; unsigned skip; // skip glyph when layouting text FT_Glyph glyph; FT_Glyph outline_glyph; Bitmap *bm; // glyph bitmap Bitmap *bm_o; // outline bitmap Bitmap *bm_s; // shadow bitmap FT_BBox bbox; FT_Vector pos; char linebreak; // the first (leading) glyph of some line ? uint32_t c[4]; // colors FT_Vector advance; // 26.6 Effect effect_type; int effect_timing; // time duration of current karaoke word // after process_karaoke_effects: distance in pixels from the glyph origin. // part of the glyph to the left of it is displayed in a different color. int effect_skip_timing; // delay after the end of last karaoke word int asc, desc; // font max ascender and descender int be; // blur edges double blur; // gaussian blur double shadow_x; double shadow_y; double frx, fry, frz; // rotation double fax, fay; // text shearing BitmapHashKey hash_key; } GlyphInfo; typedef struct { double asc, desc; } LineInfo; typedef struct { GlyphInfo *glyphs; int length; LineInfo *lines; int n_lines; double height; int max_glyphs; int max_lines; } TextInfo; // Renderer state. // Values like current font face, color, screen position, clipping and so on are stored here. typedef struct { ASS_Event *event; ASS_Style *style; ASS_Font *font; char *font_path; double font_size; int flags; // decoration flags (underline/strike-through) FT_Stroker stroker; int alignment; // alignment overrides go here; if zero, style value will be used double frx, fry, frz; double fax, fay; // text shearing enum { EVENT_NORMAL, // "normal" top-, sub- or mid- title EVENT_POSITIONED, // happens after pos(,), margins are ignored EVENT_HSCROLL, // "Banner" transition effect, text_width is unlimited EVENT_VSCROLL // "Scroll up", "Scroll down" transition effects } evt_type; double pos_x, pos_y; // position double org_x, org_y; // origin char have_origin; // origin is explicitly defined; if 0, get_base_point() is used double scale_x, scale_y; double hspacing; // distance between letters, in pixels double border_x; // outline width double border_y; uint32_t c[4]; // colors(Primary, Secondary, so on) in RGBA int clip_x0, clip_y0, clip_x1, clip_y1; char clip_mode; // 1 = iclip char detect_collisions; uint32_t fade; // alpha from \fad char be; // blur edges double blur; // gaussian blur double shadow_x; double shadow_y; int drawing_mode; // not implemented; when != 0 text is discarded, except for style override tags ASS_Drawing *drawing; // current drawing ASS_Drawing *clip_drawing; // clip vector int clip_drawing_mode; // 0 = regular clip, 1 = inverse clip Effect effect_type; int effect_timing; int effect_skip_timing; enum { SCROLL_LR, // left-to-right SCROLL_RL, SCROLL_TB, // top-to-bottom SCROLL_BT } scroll_direction; // for EVENT_HSCROLL, EVENT_VSCROLL int scroll_shift; // face properties char *family; unsigned bold; unsigned italic; int treat_family_as_pattern; int wrap_style; } RenderContext; typedef struct { Hashmap *font_cache; Hashmap *glyph_cache; Hashmap *bitmap_cache; Hashmap *composite_cache; size_t glyph_max; size_t bitmap_max_size; } CacheStore; struct ass_renderer { ASS_Library *library; FT_Library ftlibrary; FCInstance *fontconfig_priv; ASS_Settings settings; int render_id; ASS_SynthPriv *synth_priv; ASS_Image *images_root; // rendering result is stored here ASS_Image *prev_images_root; EventImages *eimg; // temporary buffer for sorting rendered events int eimg_size; // allocated buffer size // frame-global data int width, height; // screen dimensions int orig_height; // frame height ( = screen height - margins ) int orig_width; // frame width ( = screen width - margins ) int orig_height_nocrop; // frame height ( = screen height - margins + cropheight) int orig_width_nocrop; // frame width ( = screen width - margins + cropwidth) ASS_Track *track; long long time; // frame's timestamp, ms double font_scale; double font_scale_x; // x scale applied to all glyphs to preserve text aspect ratio double border_scale; RenderContext state; TextInfo text_info; CacheStore cache; FreeList *free_head; FreeList *free_tail; }; typedef struct render_priv { int top, height, left, width; int render_id; } RenderPriv; typedef struct { int x0; int y0; int x1; int y1; } Rect; typedef struct { int a, b; // top and height int ha, hb; // left and width } Segment; void reset_render_context(ASS_Renderer *render_priv); #endif /* LIBASS_RENDER_H */