mpv/libass/ass_render.h

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/*
* Copyright (C) 2006 Evgeniy Stepanov <eugeni.stepanov@gmail.com>
* Copyright (C) 2009 Grigori Goronzy <greg@geekmind.org>
*
* 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 <inttypes.h>
#include <ft2build.h>
#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 */