264 lines
8.1 KiB
C
264 lines
8.1 KiB
C
/*
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* Copyright (C) 2006 Evgeniy Stepanov <eugeni.stepanov@gmail.com>
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* Copyright (C) 2009 Grigori Goronzy <greg@geekmind.org>
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*
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* This file is part of libass.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef LIBASS_RENDER_H
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#define LIBASS_RENDER_H
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#include <inttypes.h>
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#include <ft2build.h>
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#include FT_FREETYPE_H
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#include FT_STROKER_H
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#include FT_GLYPH_H
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#include FT_SYNTHESIS_H
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#include "ass.h"
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#include "ass_font.h"
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#include "ass_bitmap.h"
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#include "ass_cache.h"
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#include "ass_utils.h"
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#include "ass_fontconfig.h"
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#include "ass_library.h"
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#include "ass_drawing.h"
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#define GLYPH_CACHE_MAX 1000
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#define BITMAP_CACHE_MAX_SIZE 30 * 1048576
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typedef struct {
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double xMin;
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double xMax;
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double yMin;
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double yMax;
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} DBBox;
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typedef struct {
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double x;
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double y;
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} DVector;
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typedef struct free_list {
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void *object;
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struct free_list *next;
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} FreeList;
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typedef struct {
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int frame_width;
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int frame_height;
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double font_size_coeff; // font size multiplier
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double line_spacing; // additional line spacing (in frame pixels)
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int top_margin; // height of top margin. Everything except toptitles is shifted down by top_margin.
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int bottom_margin; // height of bottom margin. (frame_height - top_margin - bottom_margin) is original video height.
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int left_margin;
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int right_margin;
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int use_margins; // 0 - place all subtitles inside original frame
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// 1 - use margins for placing toptitles and subtitles
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double aspect; // frame aspect ratio, d_width / d_height.
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double storage_aspect; // pixel ratio of the source image
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ASS_Hinting hinting;
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char *default_font;
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char *default_family;
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} ASS_Settings;
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// a rendered event
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typedef struct {
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ASS_Image *imgs;
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int top, height, left, width;
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int detect_collisions;
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int shift_direction;
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ASS_Event *event;
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} EventImages;
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typedef enum {
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EF_NONE = 0,
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EF_KARAOKE,
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EF_KARAOKE_KF,
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EF_KARAOKE_KO
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} Effect;
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// describes a glyph
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// GlyphInfo and TextInfo are used for text centering and word-wrapping operations
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typedef struct {
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unsigned symbol;
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unsigned skip; // skip glyph when layouting text
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FT_Glyph glyph;
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FT_Glyph outline_glyph;
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Bitmap *bm; // glyph bitmap
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Bitmap *bm_o; // outline bitmap
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Bitmap *bm_s; // shadow bitmap
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FT_BBox bbox;
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FT_Vector pos;
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char linebreak; // the first (leading) glyph of some line ?
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uint32_t c[4]; // colors
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FT_Vector advance; // 26.6
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Effect effect_type;
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int effect_timing; // time duration of current karaoke word
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// after process_karaoke_effects: distance in pixels from the glyph origin.
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// part of the glyph to the left of it is displayed in a different color.
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int effect_skip_timing; // delay after the end of last karaoke word
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int asc, desc; // font max ascender and descender
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int be; // blur edges
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double blur; // gaussian blur
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double shadow_x;
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double shadow_y;
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double frx, fry, frz; // rotation
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double fax, fay; // text shearing
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BitmapHashKey hash_key;
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} GlyphInfo;
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typedef struct {
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double asc, desc;
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} LineInfo;
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typedef struct {
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GlyphInfo *glyphs;
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int length;
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LineInfo *lines;
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int n_lines;
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double height;
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int max_glyphs;
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int max_lines;
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} TextInfo;
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// Renderer state.
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// Values like current font face, color, screen position, clipping and so on are stored here.
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typedef struct {
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ASS_Event *event;
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ASS_Style *style;
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ASS_Font *font;
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char *font_path;
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double font_size;
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int flags; // decoration flags (underline/strike-through)
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FT_Stroker stroker;
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int alignment; // alignment overrides go here; if zero, style value will be used
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double frx, fry, frz;
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double fax, fay; // text shearing
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enum {
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EVENT_NORMAL, // "normal" top-, sub- or mid- title
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EVENT_POSITIONED, // happens after pos(,), margins are ignored
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EVENT_HSCROLL, // "Banner" transition effect, text_width is unlimited
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EVENT_VSCROLL // "Scroll up", "Scroll down" transition effects
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} evt_type;
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double pos_x, pos_y; // position
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double org_x, org_y; // origin
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char have_origin; // origin is explicitly defined; if 0, get_base_point() is used
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double scale_x, scale_y;
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double hspacing; // distance between letters, in pixels
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double border_x; // outline width
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double border_y;
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uint32_t c[4]; // colors(Primary, Secondary, so on) in RGBA
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int clip_x0, clip_y0, clip_x1, clip_y1;
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char clip_mode; // 1 = iclip
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char detect_collisions;
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uint32_t fade; // alpha from \fad
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char be; // blur edges
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double blur; // gaussian blur
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double shadow_x;
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double shadow_y;
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int drawing_mode; // not implemented; when != 0 text is discarded, except for style override tags
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ASS_Drawing *drawing; // current drawing
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ASS_Drawing *clip_drawing; // clip vector
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int clip_drawing_mode; // 0 = regular clip, 1 = inverse clip
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Effect effect_type;
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int effect_timing;
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int effect_skip_timing;
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enum {
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SCROLL_LR, // left-to-right
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SCROLL_RL,
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SCROLL_TB, // top-to-bottom
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SCROLL_BT
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} scroll_direction; // for EVENT_HSCROLL, EVENT_VSCROLL
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int scroll_shift;
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// face properties
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char *family;
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unsigned bold;
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unsigned italic;
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int treat_family_as_pattern;
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int wrap_style;
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} RenderContext;
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typedef struct {
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Hashmap *font_cache;
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Hashmap *glyph_cache;
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Hashmap *bitmap_cache;
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Hashmap *composite_cache;
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size_t glyph_max;
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size_t bitmap_max_size;
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} CacheStore;
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struct ass_renderer {
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ASS_Library *library;
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FT_Library ftlibrary;
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FCInstance *fontconfig_priv;
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ASS_Settings settings;
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int render_id;
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ASS_SynthPriv *synth_priv;
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ASS_Image *images_root; // rendering result is stored here
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ASS_Image *prev_images_root;
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EventImages *eimg; // temporary buffer for sorting rendered events
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int eimg_size; // allocated buffer size
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// frame-global data
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int width, height; // screen dimensions
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int orig_height; // frame height ( = screen height - margins )
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int orig_width; // frame width ( = screen width - margins )
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int orig_height_nocrop; // frame height ( = screen height - margins + cropheight)
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int orig_width_nocrop; // frame width ( = screen width - margins + cropwidth)
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ASS_Track *track;
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long long time; // frame's timestamp, ms
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double font_scale;
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double font_scale_x; // x scale applied to all glyphs to preserve text aspect ratio
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double border_scale;
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RenderContext state;
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TextInfo text_info;
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CacheStore cache;
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FreeList *free_head;
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FreeList *free_tail;
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};
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typedef struct render_priv {
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int top, height, left, width;
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int render_id;
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} RenderPriv;
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typedef struct {
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int x0;
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int y0;
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int x1;
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int y1;
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} Rect;
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typedef struct {
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int a, b; // top and height
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int ha, hb; // left and width
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} Segment;
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void reset_render_context(ASS_Renderer *render_priv);
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void ass_free_images(ASS_Image *img);
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#endif /* LIBASS_RENDER_H */
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