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// -*- c-basic-offset: 8; indent-tabs-mode: t -*-
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// vim:ts=8:sw=8:noet:ai:
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Copyright (C) 2006 Evgeniy Stepanov <eugeni.stepanov@gmail.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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// avoid warnings due to different definition of this in freetype headers
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#define WE_DO_HAVE_UNISTD_H
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#include FT_FREETYPE_H
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#include FT_SYNTHESIS_H
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#ifdef WE_DO_HAVE_UNISTD_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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#define MAX_GLYPHS 1000
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static int last_render_id = 0;
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typedef struct ass_settings_s {
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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 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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ass_hinting_t hinting;
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typedef struct event_images_s {
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int detect_collisions;
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struct ass_renderer_s {
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ass_library_t* library;
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fc_instance_t* fontconfig_priv;
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ass_settings_t settings;
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ass_synth_priv_t* synth_priv;
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ass_image_t* images_root; // rendering result is stored here
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ass_image_t* prev_images_root;
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event_images_t* eimg; // temporary buffer for sorting rendered events
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int eimg_size; // allocated buffer size
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typedef enum {EF_NONE = 0, EF_KARAOKE, EF_KARAOKE_KF, EF_KARAOKE_KO} effect_t;
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// glyph_info_t and text_info_t are used for text centering and word-wrapping operations
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typedef struct glyph_info_s {
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FT_Glyph outline_glyph;
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bitmap_t* bm; // glyph bitmap
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bitmap_t* bm_o; // outline bitmap
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bitmap_t* bm_s; // shadow bitmap
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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_t 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 frx, fry, frz; // rotation
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bitmap_hash_key_t hash_key;
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typedef struct line_info_s {
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typedef struct text_info_s {
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glyph_info_t* glyphs;
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line_info_t lines[MAX_LINES];
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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 render_context_s {
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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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enum { 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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int pos_x, pos_y; // position
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int 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; // outline width
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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 detect_collisions;
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uint32_t fade; // alpha from \fad
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char be; // blur edges
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effect_t effect_type;
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int effect_skip_timing;
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enum { SCROLL_LR, // left-to-right
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SCROLL_TB, // top-to-bottom
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} scroll_direction; // for EVENT_HSCROLL, EVENT_VSCROLL
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typedef struct frame_context_s {
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ass_renderer_t* ass_priv;
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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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long long time; // frame's timestamp, ms
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double font_scale_x; // x scale applied to all glyphs to preserve text aspect ratio
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static ass_renderer_t* ass_renderer;
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static ass_settings_t* global_settings;
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static text_info_t text_info;
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static render_context_t render_context;
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static frame_context_t frame_context;
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struct render_priv_s {
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static void ass_lazy_track_init(void)
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ass_track_t* track = frame_context.track;
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if (track->PlayResX && track->PlayResY)
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if (!track->PlayResX && !track->PlayResY) {
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mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_NeitherPlayResXNorPlayResYDefined);
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track->PlayResX = 384;
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track->PlayResY = 288;
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double orig_aspect = (global_settings->aspect * frame_context.height * frame_context.orig_width) /
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frame_context.orig_height / frame_context.width;
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if (!track->PlayResY) {
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track->PlayResY = track->PlayResX / orig_aspect + .5;
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mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_PlayResYUndefinedSettingY, track->PlayResY);
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} else if (!track->PlayResX) {
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track->PlayResX = track->PlayResY * orig_aspect + .5;
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mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_PlayResXUndefinedSettingX, track->PlayResX);
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ass_renderer_t* ass_renderer_init(ass_library_t* library)
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ass_renderer_t* priv = 0;
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memset(&render_context, 0, sizeof(render_context));
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memset(&frame_context, 0, sizeof(frame_context));
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memset(&text_info, 0, sizeof(text_info));
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error = FT_Init_FreeType( &ft );
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mp_msg(MSGT_ASS, MSGL_FATAL, MSGTR_LIBASS_FT_Init_FreeTypeFailed);
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priv = calloc(1, sizeof(ass_renderer_t));
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FT_Done_FreeType(ft);
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priv->synth_priv = ass_synth_init();
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priv->library = library;
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priv->ftlibrary = ft;
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// images_root and related stuff is zero-filled in calloc
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ass_font_cache_init();
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ass_bitmap_cache_init();
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ass_glyph_cache_init();
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text_info.glyphs = calloc(MAX_GLYPHS, sizeof(glyph_info_t));
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if (priv) mp_msg(MSGT_ASS, MSGL_INFO, MSGTR_LIBASS_Init);
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else mp_msg(MSGT_ASS, MSGL_ERR, MSGTR_LIBASS_InitFailed);
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void ass_renderer_done(ass_renderer_t* priv)
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ass_font_cache_done();
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ass_bitmap_cache_done();
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ass_glyph_cache_done();
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if (render_context.stroker) {
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FT_Stroker_Done(render_context.stroker);
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render_context.stroker = 0;
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if (priv && priv->ftlibrary) FT_Done_FreeType(priv->ftlibrary);
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if (priv && priv->fontconfig_priv) fontconfig_done(priv->fontconfig_priv);
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if (priv && priv->synth_priv) ass_synth_done(priv->synth_priv);
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if (priv && priv->eimg) free(priv->eimg);
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if (priv) free(priv);
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if (text_info.glyphs) free(text_info.glyphs);
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* \brief Create a new ass_image_t
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* Parameters are the same as ass_image_t fields.
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static ass_image_t* my_draw_bitmap(unsigned char* bitmap, int bitmap_w, int bitmap_h, int stride, int dst_x, int dst_y, uint32_t color)
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ass_image_t* img = calloc(1, sizeof(ass_image_t));
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img->stride = stride;
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img->bitmap = bitmap;
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* \brief convert bitmap glyph into ass_image_t struct(s)
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* \param bit freetype bitmap glyph, FT_PIXEL_MODE_GRAY
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* \param dst_x bitmap x coordinate in video frame
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* \param dst_y bitmap y coordinate in video frame
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* \param color first color, RGBA
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* \param color2 second color, RGBA
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* \param brk x coordinate relative to glyph origin, color is used to the left of brk, color2 - to the right
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* \param tail pointer to the last image's next field, head of the generated list should be stored here
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* \return pointer to the new list tail
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* Performs clipping. Uses my_draw_bitmap for actual bitmap convertion.
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static ass_image_t** render_glyph(bitmap_t* bm, int dst_x, int dst_y, uint32_t color, uint32_t color2, int brk, ass_image_t** tail)
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// brk is relative to dst_x
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// color = color left of brk
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// color2 = color right of brk
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int b_x0, b_y0, b_x1, b_y1; // visible part of the bitmap
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int clip_x0, clip_y0, clip_x1, clip_y1;
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clip_x0 = render_context.clip_x0;
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clip_y0 = render_context.clip_y0;
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clip_x1 = render_context.clip_x1;
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clip_y1 = render_context.clip_y1;
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tmp = dst_x - clip_x0;
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mp_msg(MSGT_ASS, MSGL_DBG2, "clip left\n");
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tmp = dst_y - clip_y0;
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mp_msg(MSGT_ASS, MSGL_DBG2, "clip top\n");
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tmp = clip_x1 - dst_x - bm->w;
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mp_msg(MSGT_ASS, MSGL_DBG2, "clip right\n");
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tmp = clip_y1 - dst_y - bm->h;
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mp_msg(MSGT_ASS, MSGL_DBG2, "clip bottom\n");
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if ((b_y0 >= b_y1) || (b_x0 >= b_x1))
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if (brk > b_x0) { // draw left part
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if (brk > b_x1) brk = b_x1;
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img = my_draw_bitmap(bm->buffer + bm->w * b_y0 + b_x0,
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brk - b_x0, b_y1 - b_y0, bm->w,
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dst_x + b_x0, dst_y + b_y0, color);
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if (brk < b_x1) { // draw right part
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if (brk < b_x0) brk = b_x0;
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img = my_draw_bitmap(bm->buffer + bm->w * b_y0 + brk,
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b_x1 - brk, b_y1 - b_y0, bm->w,
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dst_x + brk, dst_y + b_y0, color2);
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* \brief Convert text_info_t struct to ass_image_t list
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* Splits glyphs in halves when needed (for \kf karaoke).
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static ass_image_t* render_text(text_info_t* text_info, int dst_x, int dst_y)
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ass_image_t** tail = &head;
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for (i = 0; i < text_info->length; ++i) {
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glyph_info_t* info = text_info->glyphs + i;
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if ((info->symbol == 0) || (info->symbol == '\n') || !info->bm_s || (info->shadow == 0))
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pen_x = dst_x + info->pos.x + info->shadow;
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pen_y = dst_y + info->pos.y + info->shadow;
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tail = render_glyph(bm, pen_x, pen_y, info->c[3], 0, 1000000, tail);
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for (i = 0; i < text_info->length; ++i) {
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glyph_info_t* info = text_info->glyphs + i;
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if ((info->symbol == 0) || (info->symbol == '\n') || !info->bm_o)
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pen_x = dst_x + info->pos.x;
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pen_y = dst_y + info->pos.y;
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if ((info->effect_type == EF_KARAOKE_KO) && (info->effect_timing <= info->bbox.xMax)) {
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tail = render_glyph(bm, pen_x, pen_y, info->c[2], 0, 1000000, tail);
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for (i = 0; i < text_info->length; ++i) {
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glyph_info_t* info = text_info->glyphs + i;
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if ((info->symbol == 0) || (info->symbol == '\n') || !info->bm)
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pen_x = dst_x + info->pos.x;
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pen_y = dst_y + info->pos.y;
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if ((info->effect_type == EF_KARAOKE) || (info->effect_type == EF_KARAOKE_KO)) {
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if (info->effect_timing > info->bbox.xMax)
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tail = render_glyph(bm, pen_x, pen_y, info->c[0], 0, 1000000, tail);
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tail = render_glyph(bm, pen_x, pen_y, info->c[1], 0, 1000000, tail);
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} else if (info->effect_type == EF_KARAOKE_KF) {
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tail = render_glyph(bm, pen_x, pen_y, info->c[0], info->c[1], info->effect_timing, tail);
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tail = render_glyph(bm, pen_x, pen_y, info->c[0], 0, 1000000, tail);
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* \brief Mapping between script and screen coordinates
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static int x2scr(int x) {
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return x*frame_context.orig_width / frame_context.track->PlayResX + global_settings->left_margin;
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* \brief Mapping between script and screen coordinates
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static int y2scr(int y) {
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return y * frame_context.orig_height / frame_context.track->PlayResY + global_settings->top_margin;
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// the same for toptitles
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static int y2scr_top(int y) {
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if (global_settings->use_margins)
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return y * frame_context.orig_height / frame_context.track->PlayResY;
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return y * frame_context.orig_height / frame_context.track->PlayResY + global_settings->top_margin;
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// the same for subtitles
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static int y2scr_sub(int y) {
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if (global_settings->use_margins)
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return y * frame_context.orig_height / frame_context.track->PlayResY +
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global_settings->top_margin + global_settings->bottom_margin;
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return y * frame_context.orig_height / frame_context.track->PlayResY + global_settings->top_margin;
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static void compute_string_bbox( text_info_t* info, FT_BBox *abbox ) {
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if (text_info.length > 0) {
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bbox.yMin = - d6_to_int(text_info.lines[0].asc) + text_info.glyphs[0].pos.y;
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bbox.yMax = d6_to_int(text_info.height - text_info.lines[0].asc) + text_info.glyphs[0].pos.y;
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for (i = 0; i < text_info.length; ++i) {
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int s = text_info.glyphs[i].pos.x;
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int e = s + d6_to_int(text_info.glyphs[i].advance.x);
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bbox.xMin = FFMIN(bbox.xMin, s);
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bbox.xMax = FFMAX(bbox.xMax, e);
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bbox.xMin = bbox.xMax = bbox.yMin = bbox.yMax = 0;
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/* return string bbox */
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* \brief Check if starting part of (*p) matches sample. If true, shift p to the first symbol after the matching part.
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static inline int mystrcmp(char** p, const char* sample) {
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int len = strlen(sample);
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if (strncmp(*p, sample, len) == 0) {
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static void change_font_size(double sz)
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double size = sz * frame_context.font_scale;
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else if (size > frame_context.height * 2)
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size = frame_context.height * 2;
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ass_font_set_size(render_context.font, size);
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render_context.font_size = sz;
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* \brief Change current font, using setting from render_context.
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static void update_font(void)
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ass_renderer_t* priv = frame_context.ass_priv;
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ass_font_desc_t desc;
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desc.family = strdup(render_context.family);
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val = render_context.bold;
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// 0 = normal, 1 = bold, >1 = exact weight
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if (val == 0) val = 80; // normal
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else if (val == 1) val = 200; // bold
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val = render_context.italic;
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if (val == 0) val = 0; // normal
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else if (val == 1) val = 110; //italic
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render_context.font = ass_font_new(priv->library, priv->ftlibrary, priv->fontconfig_priv, &desc);
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if (render_context.font)
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change_font_size(render_context.font_size);
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* \brief Change border width
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* negative value resets border to style value
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static void change_border(double border)
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if (!render_context.font) return;
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if (render_context.style->BorderStyle == 1) {
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if (render_context.style->Outline == 0 && render_context.style->Shadow > 0)
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border = render_context.style->Outline;
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render_context.border = border;
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b = 64 * border * frame_context.border_scale;
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if (!render_context.stroker) {
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#if (FREETYPE_MAJOR > 2) || ((FREETYPE_MAJOR == 2) && (FREETYPE_MINOR > 1))
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error = FT_Stroker_New( ass_renderer->ftlibrary, &render_context.stroker );
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error = FT_Stroker_New( render_context.font->faces[0]->memory, &render_context.stroker );
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mp_msg(MSGT_ASS, MSGL_V, "failed to get stroker\n");
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render_context.stroker = 0;
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if (render_context.stroker)
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FT_Stroker_Set( render_context.stroker, b,
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FT_STROKER_LINECAP_ROUND,
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FT_STROKER_LINEJOIN_ROUND,
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FT_Stroker_Done(render_context.stroker);
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render_context.stroker = 0;
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#define _r(c) ((c)>>24)
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#define _g(c) (((c)>>16)&0xFF)
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#define _b(c) (((c)>>8)&0xFF)
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#define _a(c) ((c)&0xFF)
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* \brief Calculate a weighted average of two colors
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* calculates c1*(1-a) + c2*a, but separately for each component except alpha
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static void change_color(uint32_t* var, uint32_t new, double pwr)
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(*var)= ((uint32_t)(_r(*var) * (1 - pwr) + _r(new) * pwr) << 24) +
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((uint32_t)(_g(*var) * (1 - pwr) + _g(new) * pwr) << 16) +
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((uint32_t)(_b(*var) * (1 - pwr) + _b(new) * pwr) << 8) +
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// like change_color, but for alpha component only
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static void change_alpha(uint32_t* var, uint32_t new, double pwr)
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*var = (_r(*var) << 24) + (_g(*var) << 16) + (_b(*var) << 8) + (_a(*var) * (1 - pwr) + _a(new) * pwr);
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* \brief Multiply two alpha values
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* \param a first value
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* \param b second value
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* \return result of multiplication
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* Parameters and result are limited by 0xFF.
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static uint32_t mult_alpha(uint32_t a, uint32_t b)
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return 0xFF - (0xFF - a) * (0xFF - b) / 0xFF;
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* \brief Calculate alpha value by piecewise linear function
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* Used for \fad, \fade implementation.
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static unsigned interpolate_alpha(long long now,
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long long t1, long long t2, long long t3, long long t4,
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unsigned a1, unsigned a2, unsigned a3)
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} else if (now >= t4) {
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} else if (now < t2) { // and > t1
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cf = ((double)(now - t1)) / (t2 - t1);
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a = a1 * (1 - cf) + a2 * cf;
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} else if (now > t3) {
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cf = ((double)(now - t3)) / (t4 - t3);
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a = a2 * (1 - cf) + a3 * cf;
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} else { // t2 <= now <= t3
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static void reset_render_context(void);
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* \brief Parse style override tag.
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* \param p string to parse
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* \param pwr multiplier for some tag effects (comes from \t tags)
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static char* parse_tag(char* p, double pwr) {
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#define skip_all(x) if (*p == (x)) ++p; else { \
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while ((*p != (x)) && (*p != '}') && (*p != 0)) {++p;} }
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#define skip(x) if (*p == (x)) ++p; else { return p; }
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if ((*p == '}') || (*p == 0))
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if (mystrcmp(&p, "fsc")) {
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if (mystrtod(&p, &val)) {
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render_context.scale_x = render_context.scale_x * ( 1 - pwr) + val * pwr;
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render_context.scale_x = render_context.style->ScaleX;
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} else if (tp == 'y') {
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if (mystrtod(&p, &val)) {
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render_context.scale_y = render_context.scale_y * ( 1 - pwr) + val * pwr;
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render_context.scale_y = render_context.style->ScaleY;
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} else if (mystrcmp(&p, "fsp")) {
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if (mystrtod(&p, &val))
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render_context.hspacing = render_context.hspacing * ( 1 - pwr ) + val * pwr;
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render_context.hspacing = render_context.style->Spacing;
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} else if (mystrcmp(&p, "fs")) {
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if (mystrtod(&p, &val))
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val = render_context.font_size * ( 1 - pwr ) + val * pwr;
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val = render_context.style->FontSize;
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if (render_context.font)
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change_font_size(val);
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} else if (mystrcmp(&p, "bord")) {
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if (mystrtod(&p, &val))
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val = render_context.border * ( 1 - pwr ) + val * pwr;
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val = -1.; // reset to default
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} else if (mystrcmp(&p, "move")) {
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long long t1, t2, delta_t, t;
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x1 = strtol(p, &p, 10);
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y1 = strtol(p, &p, 10);
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x2 = strtol(p, &p, 10);
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y2 = strtol(p, &p, 10);
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t1 = strtoll(p, &p, 10);
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t2 = strtoll(p, &p, 10);
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mp_msg(MSGT_ASS, MSGL_DBG2, "movement6: (%d, %d) -> (%d, %d), (%" PRId64 " .. %" PRId64 ")\n",
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x1, y1, x2, y2, (int64_t)t1, (int64_t)t2);
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t2 = render_context.event->Duration;
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mp_msg(MSGT_ASS, MSGL_DBG2, "movement: (%d, %d) -> (%d, %d)\n", x1, y1, x2, y2);
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t = frame_context.time - render_context.event->Start;
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else k = ((double)(t - t1)) / delta_t;
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x = k * (x2 - x1) + x1;
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y = k * (y2 - y1) + y1;
755
render_context.pos_x = x;
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render_context.pos_y = y;
757
render_context.detect_collisions = 0;
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render_context.evt_type = EVENT_POSITIONED;
759
} else if (mystrcmp(&p, "frx")) {
761
if (mystrtod(&p, &val)) {
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render_context.frx = val * pwr + render_context.frx * (1-pwr);
765
render_context.frx = 0.;
766
} else if (mystrcmp(&p, "fry")) {
768
if (mystrtod(&p, &val)) {
770
render_context.fry = val * pwr + render_context.fry * (1-pwr);
772
render_context.fry = 0.;
773
} else if (mystrcmp(&p, "frz") || mystrcmp(&p, "fr")) {
775
if (mystrtod(&p, &val)) {
777
render_context.frz = val * pwr + render_context.frz * (1-pwr);
779
render_context.frz = M_PI * render_context.style->Angle / 180.;
780
} else if (mystrcmp(&p, "fn")) {
785
family = malloc(p - start + 1);
786
strncpy(family, start, p - start);
787
family[p - start] = '\0';
789
family = strdup(render_context.style->FontName);
790
if (render_context.family)
791
free(render_context.family);
792
render_context.family = family;
794
} else if (mystrcmp(&p, "alpha")) {
797
if (strtocolor(&p, &val)) {
798
unsigned char a = val >> 24;
799
for (i = 0; i < 4; ++i)
800
change_alpha(&render_context.c[i], a, pwr);
802
change_alpha(&render_context.c[0], render_context.style->PrimaryColour, pwr);
803
change_alpha(&render_context.c[1], render_context.style->SecondaryColour, pwr);
804
change_alpha(&render_context.c[2], render_context.style->OutlineColour, pwr);
805
change_alpha(&render_context.c[3], render_context.style->BackColour, pwr);
808
} else if (mystrcmp(&p, "an")) {
810
if (mystrtoi(&p, 10, &val) && val) {
811
int v = (val - 1) / 3; // 0, 1 or 2 for vertical alignment
812
mp_msg(MSGT_ASS, MSGL_DBG2, "an %d\n", val);
813
if (v != 0) v = 3 - v;
814
val = ((val - 1) % 3) + 1; // horizontal alignment
816
mp_msg(MSGT_ASS, MSGL_DBG2, "align %d\n", val);
817
render_context.alignment = val;
819
render_context.alignment = render_context.style->Alignment;
820
} else if (mystrcmp(&p, "a")) {
822
if (mystrtoi(&p, 10, &val) && val)
823
render_context.alignment = val;
825
render_context.alignment = render_context.style->Alignment;
826
} else if (mystrcmp(&p, "pos")) {
829
v1 = strtol(p, &p, 10);
831
v2 = strtol(p, &p, 10);
833
mp_msg(MSGT_ASS, MSGL_DBG2, "pos(%d, %d)\n", v1, v2);
834
render_context.evt_type = EVENT_POSITIONED;
835
render_context.detect_collisions = 0;
836
render_context.pos_x = v1;
837
render_context.pos_y = v2;
838
} else if (mystrcmp(&p, "fad")) {
840
long long t1, t2, t3, t4;
841
if (*p == 'e') ++p; // either \fad or \fade
843
a1 = strtol(p, &p, 10);
845
a2 = strtol(p, &p, 10);
847
// 2-argument version (\fad, according to specs)
848
// a1 and a2 are fade-in and fade-out durations
850
t4 = render_context.event->Duration;
857
// 6-argument version (\fade)
858
// a1 and a2 (and a3) are opacity values
860
a3 = strtol(p, &p, 10);
862
t1 = strtoll(p, &p, 10);
864
t2 = strtoll(p, &p, 10);
866
t3 = strtoll(p, &p, 10);
868
t4 = strtoll(p, &p, 10);
871
render_context.fade = interpolate_alpha(frame_context.time - render_context.event->Start, t1, t2, t3, t4, a1, a2, a3);
872
} else if (mystrcmp(&p, "org")) {
875
v1 = strtol(p, &p, 10);
877
v2 = strtol(p, &p, 10);
879
mp_msg(MSGT_ASS, MSGL_DBG2, "org(%d, %d)\n", v1, v2);
880
// render_context.evt_type = EVENT_POSITIONED;
881
render_context.org_x = v1;
882
render_context.org_y = v2;
883
render_context.have_origin = 1;
884
} else if (mystrcmp(&p, "t")) {
889
long long t1, t2, t, delta_t;
892
for (cnt = 0; cnt < 3; ++cnt) {
895
v[cnt] = strtod(p, &p);
899
v1 = v[0]; v2 = v[1]; v3 = v[2];
900
} else if (cnt == 2) {
901
v1 = v[0]; v2 = v[1]; v3 = 1.;
902
} else if (cnt == 1) {
903
v1 = 0; v2 = render_context.event->Duration; v3 = v[0];
905
v1 = 0; v2 = render_context.event->Duration; v3 = 1.;
907
render_context.detect_collisions = 0;
913
t = frame_context.time - render_context.event->Start; // FIXME: move to render_context
919
assert(delta_t != 0.);
920
k = pow(((double)(t - t1)) / delta_t, v3);
923
p = parse_tag(p, k); // maybe k*pwr ? no, specs forbid nested \t's
924
skip_all(')'); // FIXME: better skip(')'), but much more tags support required
925
} else if (mystrcmp(&p, "clip")) {
929
res &= mystrtoi(&p, 10, &x0);
931
res &= mystrtoi(&p, 10, &y0);
933
res &= mystrtoi(&p, 10, &x1);
935
res &= mystrtoi(&p, 10, &y1);
938
render_context.clip_x0 = render_context.clip_x0 * (1-pwr) + x0 * pwr;
939
render_context.clip_x1 = render_context.clip_x1 * (1-pwr) + x1 * pwr;
940
render_context.clip_y0 = render_context.clip_y0 * (1-pwr) + y0 * pwr;
941
render_context.clip_y1 = render_context.clip_y1 * (1-pwr) + y1 * pwr;
943
render_context.clip_x0 = 0;
944
render_context.clip_y0 = 0;
945
render_context.clip_x1 = frame_context.track->PlayResX;
946
render_context.clip_y1 = frame_context.track->PlayResY;
948
} else if (mystrcmp(&p, "c")) {
950
if (!strtocolor(&p, &val))
951
val = render_context.style->PrimaryColour;
952
mp_msg(MSGT_ASS, MSGL_DBG2, "color: %X\n", val);
953
change_color(&render_context.c[0], val, pwr);
954
} else if ((*p >= '1') && (*p <= '4') && (++p) && (mystrcmp(&p, "c") || mystrcmp(&p, "a"))) {
959
assert((n >= '1') && (n <= '4'));
960
if (!strtocolor(&p, &val))
962
case '1': val = render_context.style->PrimaryColour; break;
963
case '2': val = render_context.style->SecondaryColour; break;
964
case '3': val = render_context.style->OutlineColour; break;
965
case '4': val = render_context.style->BackColour; break;
966
default : val = 0; break; // impossible due to assert; avoid compilation warning
969
case 'c': change_color(render_context.c + cidx, val, pwr); break;
970
case 'a': change_alpha(render_context.c + cidx, val >> 24, pwr); break;
971
default: mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_BadCommand, n, cmd); break;
973
mp_msg(MSGT_ASS, MSGL_DBG2, "single c/a at %f: %c%c = %X \n", pwr, n, cmd, render_context.c[cidx]);
974
} else if (mystrcmp(&p, "r")) {
975
reset_render_context();
976
} else if (mystrcmp(&p, "be")) {
978
if (mystrtoi(&p, 10, &val))
979
render_context.be = val ? 1 : 0;
981
render_context.be = 0;
982
} else if (mystrcmp(&p, "b")) {
984
if (mystrtoi(&p, 10, &b)) {
986
render_context.bold = b;
988
render_context.bold = render_context.style->Bold;
990
} else if (mystrcmp(&p, "i")) {
992
if (mystrtoi(&p, 10, &i)) {
994
render_context.italic = i;
996
render_context.italic = render_context.style->Italic;
998
} else if (mystrcmp(&p, "kf") || mystrcmp(&p, "K")) {
999
int val = strtol(p, &p, 10);
1000
render_context.effect_type = EF_KARAOKE_KF;
1001
if (render_context.effect_timing)
1002
render_context.effect_skip_timing += render_context.effect_timing;
1003
render_context.effect_timing = val * 10;
1004
} else if (mystrcmp(&p, "ko")) {
1005
int val = strtol(p, &p, 10);
1006
render_context.effect_type = EF_KARAOKE_KO;
1007
if (render_context.effect_timing)
1008
render_context.effect_skip_timing += render_context.effect_timing;
1009
render_context.effect_timing = val * 10;
1010
} else if (mystrcmp(&p, "k")) {
1011
int val = strtol(p, &p, 10);
1012
render_context.effect_type = EF_KARAOKE;
1013
if (render_context.effect_timing)
1014
render_context.effect_skip_timing += render_context.effect_timing;
1015
render_context.effect_timing = val * 10;
1016
} else if (mystrcmp(&p, "shad")) {
1018
if (mystrtoi(&p, 10, &val))
1019
render_context.shadow = val;
1021
render_context.shadow = render_context.style->Shadow;
1031
* \brief Get next ucs4 char from string, parsing and executing style overrides
1032
* \param str string pointer
1033
* \return ucs4 code of the next char
1034
* On return str points to the unparsed part of the string
1036
static unsigned get_next_char(char** str)
1040
if (*p == '{') { // '\0' goes here
1043
p = parse_tag(p, 1.);
1044
if (*p == '}') { // end of tag
1051
} else if (*p != '\\')
1052
mp_msg(MSGT_ASS, MSGL_V, "Unable to parse: \"%s\" \n", p);
1063
if ((*(p+1) == 'N') || ((*(p+1) == 'n') && (frame_context.track->WrapStyle == 2))) {
1067
} else if (*(p+1) == 'n') {
1073
chr = utf8_get_char(&p);
1078
static void apply_transition_effects(ass_event_t* event)
1082
char* p = event->Effect;
1084
if (!p || !*p) return;
1087
while (cnt < 4 && (p = strchr(p, ';'))) {
1088
v[cnt++] = atoi(++p);
1091
if (strncmp(event->Effect, "Banner;", 7) == 0) {
1094
mp_msg(MSGT_ASS, MSGL_V, "Error parsing effect: %s \n", event->Effect);
1097
if (cnt >= 2 && v[1] == 0) // right-to-left
1098
render_context.scroll_direction = SCROLL_RL;
1099
else // left-to-right
1100
render_context.scroll_direction = SCROLL_LR;
1103
if (delay == 0) delay = 1; // ?
1104
render_context.scroll_shift = (frame_context.time - render_context.event->Start) / delay;
1105
render_context.evt_type = EVENT_HSCROLL;
1109
if (strncmp(event->Effect, "Scroll up;", 10) == 0) {
1110
render_context.scroll_direction = SCROLL_BT;
1111
} else if (strncmp(event->Effect, "Scroll down;", 12) == 0) {
1112
render_context.scroll_direction = SCROLL_TB;
1114
mp_msg(MSGT_ASS, MSGL_V, "Unknown transition effect: %s \n", event->Effect);
1117
// parse scroll up/down parameters
1122
mp_msg(MSGT_ASS, MSGL_V, "Error parsing effect: %s \n", event->Effect);
1126
if (delay == 0) delay = 1; // ?
1127
render_context.scroll_shift = (frame_context.time - render_context.event->Start) / delay;
1129
y0 = v[0]; y1 = v[1];
1131
y0 = v[1]; y1 = v[0];
1134
y1 = frame_context.track->PlayResY; // y0=y1=0 means fullscreen scrolling
1135
render_context.clip_y0 = y0;
1136
render_context.clip_y1 = y1;
1137
render_context.evt_type = EVENT_VSCROLL;
1138
render_context.detect_collisions = 0;
1144
* \brief partially reset render_context to style values
1145
* Works like {\r}: resets some style overrides
1147
static void reset_render_context(void)
1149
render_context.c[0] = render_context.style->PrimaryColour;
1150
render_context.c[1] = render_context.style->SecondaryColour;
1151
render_context.c[2] = render_context.style->OutlineColour;
1152
render_context.c[3] = render_context.style->BackColour;
1153
render_context.font_size = render_context.style->FontSize;
1155
if (render_context.family)
1156
free(render_context.family);
1157
render_context.family = strdup(render_context.style->FontName);
1158
render_context.bold = render_context.style->Bold;
1159
render_context.italic = render_context.style->Italic;
1163
render_context.scale_x = render_context.style->ScaleX;
1164
render_context.scale_y = render_context.style->ScaleY;
1165
render_context.hspacing = render_context.style->Spacing;
1166
render_context.be = 0;
1167
render_context.shadow = render_context.style->Shadow;
1168
render_context.frx = render_context.fry = 0.;
1169
render_context.frz = M_PI * render_context.style->Angle / 180.;
1171
// FIXME: does not reset unsupported attributes.
1175
* \brief Start new event. Reset render_context.
1177
static void init_render_context(ass_event_t* event)
1179
render_context.event = event;
1180
render_context.style = frame_context.track->styles + event->Style;
1182
reset_render_context();
1184
render_context.evt_type = EVENT_NORMAL;
1185
render_context.alignment = render_context.style->Alignment;
1186
render_context.pos_x = 0;
1187
render_context.pos_y = 0;
1188
render_context.org_x = 0;
1189
render_context.org_y = 0;
1190
render_context.have_origin = 0;
1191
render_context.clip_x0 = 0;
1192
render_context.clip_y0 = 0;
1193
render_context.clip_x1 = frame_context.track->PlayResX;
1194
render_context.clip_y1 = frame_context.track->PlayResY;
1195
render_context.detect_collisions = 1;
1196
render_context.fade = 0;
1197
render_context.effect_type = EF_NONE;
1198
render_context.effect_timing = 0;
1199
render_context.effect_skip_timing = 0;
1201
apply_transition_effects(event);
1204
static void free_render_context(void)
1209
* \brief Get normal and outline (border) glyphs
1210
* \param symbol ucs4 char
1211
* \param info out: struct filled with extracted data
1212
* \param advance subpixel shift vector used for cache lookup
1213
* Tries to get both glyphs from cache.
1214
* If they can't be found, gets a glyph from font face, generates outline with FT_Stroker,
1215
* and add them to cache.
1216
* The glyphs are returned in info->glyph and info->outline_glyph
1218
static void get_outline_glyph(int symbol, glyph_info_t* info, FT_Vector* advance)
1221
glyph_hash_val_t* val;
1222
glyph_hash_key_t key;
1223
key.font = render_context.font;
1224
key.size = render_context.font_size;
1226
key.scale_x = (render_context.scale_x * 0xFFFF);
1227
key.scale_y = (render_context.scale_y * 0xFFFF);
1228
key.advance = *advance;
1229
key.bold = render_context.bold;
1230
key.italic = render_context.italic;
1231
key.outline = render_context.border * 0xFFFF;
1233
info->glyph = info->outline_glyph = 0;
1235
val = cache_find_glyph(&key);
1237
FT_Glyph_Copy(val->glyph, &info->glyph);
1238
if (val->outline_glyph)
1239
FT_Glyph_Copy(val->outline_glyph, &info->outline_glyph);
1240
info->bbox = val->bbox_scaled;
1241
info->advance.x = val->advance.x;
1242
info->advance.y = val->advance.y;
1245
info->glyph = ass_font_get_glyph(frame_context.ass_priv->fontconfig_priv, render_context.font, symbol, global_settings->hinting);
1248
info->advance.x = d16_to_d6(info->glyph->advance.x);
1249
info->advance.y = d16_to_d6(info->glyph->advance.y);
1250
FT_Glyph_Get_CBox( info->glyph, FT_GLYPH_BBOX_PIXELS, &info->bbox);
1252
if (render_context.stroker) {
1253
info->outline_glyph = info->glyph;
1254
error = FT_Glyph_StrokeBorder( &(info->outline_glyph), render_context.stroker, 0 , 0 ); // don't destroy original
1256
mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_FT_Glyph_Stroke_Error, error);
1260
memset(&v, 0, sizeof(v));
1261
FT_Glyph_Copy(info->glyph, &v.glyph);
1262
if (info->outline_glyph)
1263
FT_Glyph_Copy(info->outline_glyph, &v.outline_glyph);
1264
v.advance = info->advance;
1265
v.bbox_scaled = info->bbox;
1266
cache_add_glyph(&key, &v);
1270
static void transform_3d(FT_Vector shift, FT_Glyph* glyph, FT_Glyph* glyph2, double frx, double fry, double frz);
1273
* \brief Get bitmaps for a glyph
1274
* \param info glyph info
1275
* Tries to get glyph bitmaps from bitmap cache.
1276
* If they can't be found, they are generated by rotating and rendering the glyph.
1277
* After that, bitmaps are added to the cache.
1278
* They are returned in info->bm (glyph), info->bm_o (outline) and info->bm_s (shadow).
1280
static void get_bitmap_glyph(glyph_info_t* info)
1282
bitmap_hash_val_t* val;
1283
bitmap_hash_key_t* key = &info->hash_key;
1285
val = cache_find_bitmap(key);
1290
info->bm_o = val->bm_o;
1291
info->bm_s = val->bm_s;
1294
bitmap_hash_val_t hash_val;
1296
info->bm = info->bm_o = info->bm_s = 0;
1297
if (info->glyph && info->symbol != '\n' && info->symbol != 0) {
1298
// calculating rotation shift vector (from rotation origin to the glyph basepoint)
1299
shift.x = int_to_d6(info->hash_key.shift_x);
1300
shift.y = int_to_d6(info->hash_key.shift_y);
1302
transform_3d(shift, &info->glyph, &info->outline_glyph, info->frx, info->fry, info->frz);
1305
error = glyph_to_bitmap(ass_renderer->synth_priv,
1306
info->glyph, info->outline_glyph,
1307
&info->bm, &info->bm_o,
1308
&info->bm_s, info->be);
1312
// add bitmaps to cache
1313
hash_val.bm_o = info->bm_o;
1314
hash_val.bm = info->bm;
1315
hash_val.bm_s = info->bm_s;
1316
cache_add_bitmap(&(info->hash_key), &hash_val);
1319
// deallocate glyphs
1321
FT_Done_Glyph(info->glyph);
1322
if (info->outline_glyph)
1323
FT_Done_Glyph(info->outline_glyph);
1327
* This function goes through text_info and calculates text parameters.
1328
* The following text_info fields are filled:
1335
static void measure_text(void)
1337
int cur_line = 0, max_asc = 0, max_desc = 0;
1339
text_info.height = 0;
1340
for (i = 0; i < text_info.length + 1; ++i) {
1341
if ((i == text_info.length) || text_info.glyphs[i].linebreak) {
1342
text_info.lines[cur_line].asc = max_asc;
1343
text_info.lines[cur_line].desc = max_desc;
1344
text_info.height += max_asc + max_desc;
1346
max_asc = max_desc = 0;
1348
if (i < text_info.length) {
1349
glyph_info_t* cur = text_info.glyphs + i;
1350
if (cur->asc > max_asc)
1352
if (cur->desc > max_desc)
1353
max_desc = cur->desc;
1359
* \brief rearrange text between lines
1360
* \param max_text_width maximal text line width in pixels
1361
* The algo is similar to the one in libvo/sub.c:
1362
* 1. Place text, wrapping it when current line is full
1363
* 2. Try moving words from the end of a line to the beginning of the next one while it reduces
1364
* the difference in lengths between this two lines.
1365
* The result may not be optimal, but usually is good enough.
1367
static void wrap_lines_smart(int max_text_width)
1370
glyph_info_t *cur, *s1, *e1, *s2, *s3, *w;
1379
text_info.n_lines = 1;
1381
s1 = text_info.glyphs; // current line start
1382
for (i = 0; i < text_info.length; ++i) {
1383
int break_at, s_offset, len;
1384
cur = text_info.glyphs + i;
1386
s_offset = s1->bbox.xMin + s1->pos.x;
1387
len = (cur->bbox.xMax + cur->pos.x) - s_offset;
1389
if (cur->symbol == '\n') {
1392
mp_msg(MSGT_ASS, MSGL_DBG2, "forced line break at %d\n", break_at);
1395
if (len >= max_text_width) {
1397
break_at = last_space;
1402
mp_msg(MSGT_ASS, MSGL_DBG2, "overfill at %d\n", i);
1403
mp_msg(MSGT_ASS, MSGL_DBG2, "line break at %d\n", break_at);
1406
if (break_at != -1) {
1407
// need to use one more line
1408
// marking break_at+1 as start of a new line
1409
int lead = break_at + 1; // the first symbol of the new line
1410
if (text_info.n_lines >= MAX_LINES) {
1412
// no more linebreaks
1413
for (j = lead; j < text_info.length; ++j)
1414
text_info.glyphs[j].linebreak = 0;
1417
if (lead < text_info.length)
1418
text_info.glyphs[lead].linebreak = break_type;
1420
s1 = text_info.glyphs + lead;
1421
s_offset = s1->bbox.xMin + s1->pos.x;
1422
text_info.n_lines ++;
1425
if (cur->symbol == ' ')
1428
// make sure the hard linebreak is not forgotten when
1429
// there was a new soft linebreak just inserted
1430
if (cur->symbol == '\n' && break_type == 1)
1433
#define DIFF(x,y) (((x) < (y)) ? (y - x) : (x - y))
1437
w = s3 = text_info.glyphs;
1439
for (i = 0; i <= text_info.length; ++i) {
1440
cur = text_info.glyphs + i;
1441
if ((i == text_info.length) || cur->linebreak) {
1445
if (s1 && (s2->linebreak == 1)) { // have at least 2 lines, and linebreak is 'soft'
1446
int l1, l2, l1_new, l2_new;
1449
do { --w; } while ((w > s1) && (w->symbol == ' '));
1450
while ((w > s1) && (w->symbol != ' ')) { --w; }
1452
while ((e1 > s1) && (e1->symbol == ' ')) { --e1; }
1453
if (w->symbol == ' ') ++w;
1455
l1 = ((s2-1)->bbox.xMax + (s2-1)->pos.x) - (s1->bbox.xMin + s1->pos.x);
1456
l2 = ((s3-1)->bbox.xMax + (s3-1)->pos.x) - (s2->bbox.xMin + s2->pos.x);
1457
l1_new = (e1->bbox.xMax + e1->pos.x) - (s1->bbox.xMin + s1->pos.x);
1458
l2_new = ((s3-1)->bbox.xMax + (s3-1)->pos.x) - (w->bbox.xMin + w->pos.x);
1460
if (DIFF(l1_new, l2_new) < DIFF(l1, l2)) {
1467
if (i == text_info.length)
1472
assert(text_info.n_lines >= 1);
1480
for (i = 0; i < text_info.length; ++i) {
1481
cur = text_info.glyphs + i;
1482
if (cur->linebreak) {
1483
int height = text_info.lines[cur_line - 1].desc + text_info.lines[cur_line].asc;
1485
pen_shift_x = - cur->pos.x;
1486
pen_shift_y += d6_to_int(height) + global_settings->line_spacing;
1487
mp_msg(MSGT_ASS, MSGL_DBG2, "shifting from %d to %d by (%d, %d)\n", i, text_info.length - 1, pen_shift_x, pen_shift_y);
1489
cur->pos.x += pen_shift_x;
1490
cur->pos.y += pen_shift_y;
1495
* \brief determine karaoke effects
1496
* Karaoke effects cannot be calculated during parse stage (get_next_char()),
1497
* so they are done in a separate step.
1498
* Parse stage: when karaoke style override is found, its parameters are stored in the next glyph's
1499
* (the first glyph of the karaoke word)'s effect_type and effect_timing.
1501
* 1. sets effect_type for all glyphs in the word (_karaoke_ word)
1502
* 2. sets effect_timing for all glyphs to x coordinate of the border line between the left and right karaoke parts
1503
* (left part is filled with PrimaryColour, right one - with SecondaryColour).
1505
static void process_karaoke_effects(void)
1507
glyph_info_t *cur, *cur2;
1508
glyph_info_t *s1, *e1; // start and end of the current word
1509
glyph_info_t *s2; // start of the next word
1511
int timing; // current timing
1512
int tm_start, tm_end; // timings at start and end of the current word
1518
tm_current = frame_context.time - render_context.event->Start;
1521
for (i = 0; i <= text_info.length; ++i) {
1522
cur = text_info.glyphs + i;
1523
if ((i == text_info.length) || (cur->effect_type != EF_NONE)) {
1528
tm_start = timing + s1->effect_skip_timing;
1529
tm_end = tm_start + s1->effect_timing;
1533
for (cur2 = s1; cur2 <= e1; ++cur2) {
1534
x_start = FFMIN(x_start, cur2->bbox.xMin + cur2->pos.x);
1535
x_end = FFMAX(x_end, cur2->bbox.xMax + cur2->pos.x);
1538
dt = (tm_current - tm_start);
1539
if ((s1->effect_type == EF_KARAOKE) || (s1->effect_type == EF_KARAOKE_KO)) {
1544
} else if (s1->effect_type == EF_KARAOKE_KF) {
1545
dt /= (tm_end - tm_start);
1546
x = x_start + (x_end - x_start) * dt;
1548
mp_msg(MSGT_ASS, MSGL_ERR, MSGTR_LIBASS_UnknownEffectType_InternalError);
1552
for (cur2 = s1; cur2 <= e1; ++cur2) {
1553
cur2->effect_type = s1->effect_type;
1554
cur2->effect_timing = x - cur2->pos.x;
1562
* \brief Calculate base point for positioning and rotation
1563
* \param bbox text bbox
1564
* \param alignment alignment
1565
* \param bx, by out: base point coordinates
1567
static void get_base_point(FT_BBox bbox, int alignment, int* bx, int* by)
1569
const int halign = alignment & 3;
1570
const int valign = alignment & 12;
1577
*bx = (bbox.xMax + bbox.xMin) / 2;
1589
*by = (bbox.yMax + bbox.yMin) / 2;
1598
* \brief Multiply 4-vector by 4-matrix
1600
* \param m 4-matrix]
1601
* \param b out: 4-vector
1602
* Calculates a * m and stores result in b
1604
static inline void transform_point_3d(double *a, double *m, double *b)
1606
b[0] = a[0] * m[0] + a[1] * m[4] + a[2] * m[8] + a[3] * m[12];
1607
b[1] = a[0] * m[1] + a[1] * m[5] + a[2] * m[9] + a[3] * m[13];
1608
b[2] = a[0] * m[2] + a[1] * m[6] + a[2] * m[10] + a[3] * m[14];
1609
b[3] = a[0] * m[3] + a[1] * m[7] + a[2] * m[11] + a[3] * m[15];
1613
* \brief Apply 3d transformation to a vector
1614
* \param v FreeType vector (2d)
1616
* Transforms v by m, projects the result back to the screen plane
1617
* Result is returned in v.
1619
static inline void transform_vector_3d(FT_Vector* v, double *m) {
1620
const double camera = 2500 * frame_context.border_scale; // camera distance
1622
a[0] = d6_to_double(v->x);
1623
a[1] = d6_to_double(v->y);
1626
transform_point_3d(a, m, b);
1627
/* Apply perspective projection with the following matrix:
1632
where 2500 is camera distance, 8 - z-axis scale.
1633
Camera is always located in (org_x, org_y, -2500). This means
1634
that different subtitle events can be displayed at the same time
1635
using different cameras. */
1638
b[3] = 8 * b[2] + camera;
1639
if (b[3] < 0.001 && b[3] > -0.001)
1640
b[3] = b[3] < 0. ? -0.001 : 0.001;
1641
v->x = double_to_d6(b[0] / b[3]);
1642
v->y = double_to_d6(b[1] / b[3]);
1646
* \brief Apply 3d transformation to a glyph
1647
* \param glyph FreeType glyph
1649
* Transforms glyph by m, projects the result back to the screen plane
1650
* Result is returned in glyph.
1652
static inline void transform_glyph_3d(FT_Glyph glyph, double *m, FT_Vector shift) {
1654
FT_Outline* outline = &((FT_OutlineGlyph)glyph)->outline;
1655
FT_Vector* p = outline->points;
1657
for (i=0; i<outline->n_points; i++) {
1660
transform_vector_3d(p + i, m);
1665
//transform_vector_3d(&glyph->advance, m);
1669
* \brief Apply 3d transformation to several objects
1670
* \param shift FreeType vector
1671
* \param glyph FreeType glyph
1672
* \param glyph2 FreeType glyph
1673
* \param frx x-axis rotation angle
1674
* \param fry y-axis rotation angle
1675
* \param frz z-axis rotation angle
1676
* Rotates both glyphs by frx, fry and frz. Shift vector is added before rotation and subtracted after it.
1678
static void transform_3d(FT_Vector shift, FT_Glyph* glyph, FT_Glyph* glyph2, double frx, double fry, double frz)
1680
fry = - fry; // FreeType's y axis goes in the opposite direction
1681
if (frx != 0. || fry != 0. || frz != 0.) {
1683
double sx = sin(frx);
1684
double sy = sin(fry);
1685
double sz = sin(frz);
1686
double cx = cos(frx);
1687
double cy = cos(fry);
1688
double cz = cos(frz);
1689
m[0] = cy * cz; m[1] = cy*sz; m[2] = -sy; m[3] = 0.0;
1690
m[4] = -cx*sz + sx*sy*cz; m[5] = cx*cz + sx*sy*sz; m[6] = sx*cy; m[7] = 0.0;
1691
m[8] = sx*sz + cx*sy*cz; m[9] = -sx*cz + cx*sy*sz; m[10] = cx*cy; m[11] = 0.0;
1692
m[12] = 0.0; m[13] = 0.0; m[14] = 0.0; m[15] = 1.0;
1694
if (glyph && *glyph)
1695
transform_glyph_3d(*glyph, m, shift);
1697
if (glyph2 && *glyph2)
1698
transform_glyph_3d(*glyph2, m, shift);
1703
* \brief Main ass rendering function, glues everything together
1704
* \param event event to render
1705
* Process event, appending resulting ass_image_t's to images_root.
1707
static int ass_render_event(ass_event_t* event, event_images_t* event_images)
1717
int MarginL, MarginR, MarginV;
1719
int alignment, halign, valign;
1720
int device_x = 0, device_y = 0;
1722
if (event->Style >= frame_context.track->n_styles) {
1723
mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_NoStyleFound);
1727
mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_EmptyEvent);
1731
init_render_context(event);
1733
text_info.length = 0;
1741
// get next char, executing style override
1742
// this affects render_context
1743
code = get_next_char(&p);
1745
// face could have been changed in get_next_char
1746
if (!render_context.font) {
1747
free_render_context();
1754
if (text_info.length >= MAX_GLYPHS) {
1755
mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_MAX_GLYPHS_Reached,
1756
(int)(event - frame_context.track->events), event->Start, event->Duration, event->Text);
1760
if ( previous && code ) {
1762
delta = ass_font_get_kerning(render_context.font, previous, code);
1763
pen.x += delta.x * render_context.scale_x;
1764
pen.y += delta.y * render_context.scale_y;
1767
shift.x = pen.x & 63;
1768
shift.y = pen.y & 63;
1770
ass_font_set_transform(render_context.font,
1771
render_context.scale_x * frame_context.font_scale_x,
1772
render_context.scale_y,
1775
get_outline_glyph(code, text_info.glyphs + text_info.length, &shift);
1777
text_info.glyphs[text_info.length].pos.x = pen.x >> 6;
1778
text_info.glyphs[text_info.length].pos.y = pen.y >> 6;
1780
pen.x += text_info.glyphs[text_info.length].advance.x;
1781
pen.x += double_to_d6(render_context.hspacing);
1782
pen.y += text_info.glyphs[text_info.length].advance.y;
1786
text_info.glyphs[text_info.length].symbol = code;
1787
text_info.glyphs[text_info.length].linebreak = 0;
1788
for (i = 0; i < 4; ++i) {
1789
uint32_t clr = render_context.c[i];
1790
change_alpha(&clr, mult_alpha(_a(clr), render_context.fade), 1.);
1791
text_info.glyphs[text_info.length].c[i] = clr;
1793
text_info.glyphs[text_info.length].effect_type = render_context.effect_type;
1794
text_info.glyphs[text_info.length].effect_timing = render_context.effect_timing;
1795
text_info.glyphs[text_info.length].effect_skip_timing = render_context.effect_skip_timing;
1796
text_info.glyphs[text_info.length].be = render_context.be;
1797
text_info.glyphs[text_info.length].shadow = render_context.shadow;
1798
text_info.glyphs[text_info.length].frx = render_context.frx;
1799
text_info.glyphs[text_info.length].fry = render_context.fry;
1800
text_info.glyphs[text_info.length].frz = render_context.frz;
1801
ass_font_get_asc_desc(render_context.font, code,
1802
&text_info.glyphs[text_info.length].asc,
1803
&text_info.glyphs[text_info.length].desc);
1804
text_info.glyphs[text_info.length].asc *= render_context.scale_y;
1805
text_info.glyphs[text_info.length].desc *= render_context.scale_y;
1807
// fill bitmap_hash_key
1808
text_info.glyphs[text_info.length].hash_key.font = render_context.font;
1809
text_info.glyphs[text_info.length].hash_key.size = render_context.font_size;
1810
text_info.glyphs[text_info.length].hash_key.outline = render_context.border * 0xFFFF;
1811
text_info.glyphs[text_info.length].hash_key.scale_x = render_context.scale_x * 0xFFFF;
1812
text_info.glyphs[text_info.length].hash_key.scale_y = render_context.scale_y * 0xFFFF;
1813
text_info.glyphs[text_info.length].hash_key.frx = render_context.frx * 0xFFFF;
1814
text_info.glyphs[text_info.length].hash_key.fry = render_context.fry * 0xFFFF;
1815
text_info.glyphs[text_info.length].hash_key.frz = render_context.frz * 0xFFFF;
1816
text_info.glyphs[text_info.length].hash_key.bold = render_context.bold;
1817
text_info.glyphs[text_info.length].hash_key.italic = render_context.italic;
1818
text_info.glyphs[text_info.length].hash_key.ch = code;
1819
text_info.glyphs[text_info.length].hash_key.advance = shift;
1820
text_info.glyphs[text_info.length].hash_key.be = render_context.be;
1824
render_context.effect_type = EF_NONE;
1825
render_context.effect_timing = 0;
1826
render_context.effect_skip_timing = 0;
1829
if (text_info.length == 0) {
1830
// no valid symbols in the event; this can be smth like {comment}
1831
free_render_context();
1835
// depends on glyph x coordinates being monotonous, so it should be done before line wrap
1836
process_karaoke_effects();
1839
alignment = render_context.alignment;
1840
halign = alignment & 3;
1841
valign = alignment & 12;
1843
MarginL = (event->MarginL) ? event->MarginL : render_context.style->MarginL;
1844
MarginR = (event->MarginR) ? event->MarginR : render_context.style->MarginR;
1845
MarginV = (event->MarginV) ? event->MarginV : render_context.style->MarginV;
1847
if (render_context.evt_type != EVENT_HSCROLL) {
1850
// calculate max length of a line
1851
max_text_width = x2scr(frame_context.track->PlayResX - MarginR) - x2scr(MarginL);
1853
// rearrange text in several lines
1854
wrap_lines_smart(max_text_width);
1858
for (i = 1; i < text_info.length + 1; ++i) { // (text_info.length + 1) is the end of the last line
1859
if ((i == text_info.length) || text_info.glyphs[i].linebreak) {
1860
int width, shift = 0;
1861
glyph_info_t* first_glyph = text_info.glyphs + last_break + 1;
1862
glyph_info_t* last_glyph = text_info.glyphs + i - 1;
1864
while ((last_glyph > first_glyph) && ((last_glyph->symbol == '\n') || (last_glyph->symbol == 0)))
1867
width = last_glyph->pos.x + d6_to_int(last_glyph->advance.x) - first_glyph->pos.x;
1868
if (halign == HALIGN_LEFT) { // left aligned, no action
1870
} else if (halign == HALIGN_RIGHT) { // right aligned
1871
shift = max_text_width - width;
1872
} else if (halign == HALIGN_CENTER) { // centered
1873
shift = (max_text_width - width) / 2;
1875
for (j = last_break + 1; j < i; ++j) {
1876
text_info.glyphs[j].pos.x += shift;
1881
} else { // render_context.evt_type == EVENT_HSCROLL
1885
// determing text bounding box
1886
compute_string_bbox(&text_info, &bbox);
1888
// determine device coordinates for text
1890
// x coordinate for everything except positioned events
1891
if (render_context.evt_type == EVENT_NORMAL ||
1892
render_context.evt_type == EVENT_VSCROLL) {
1893
device_x = x2scr(MarginL);
1894
} else if (render_context.evt_type == EVENT_HSCROLL) {
1895
if (render_context.scroll_direction == SCROLL_RL)
1896
device_x = x2scr(frame_context.track->PlayResX - render_context.scroll_shift);
1897
else if (render_context.scroll_direction == SCROLL_LR)
1898
device_x = x2scr(render_context.scroll_shift) - (bbox.xMax - bbox.xMin);
1901
// y coordinate for everything except positioned events
1902
if (render_context.evt_type == EVENT_NORMAL ||
1903
render_context.evt_type == EVENT_HSCROLL) {
1904
if (valign == VALIGN_TOP) { // toptitle
1905
device_y = y2scr_top(MarginV) + d6_to_int(text_info.lines[0].asc);
1906
} else if (valign == VALIGN_CENTER) { // midtitle
1907
int scr_y = y2scr(frame_context.track->PlayResY / 2);
1908
device_y = scr_y - (bbox.yMax - bbox.yMin) / 2;
1909
} else { // subtitle
1911
if (valign != VALIGN_SUB)
1912
mp_msg(MSGT_ASS, MSGL_V, "Invalid valign, supposing 0 (subtitle)\n");
1913
scr_y = y2scr_sub(frame_context.track->PlayResY - MarginV);
1915
device_y -= d6_to_int(text_info.height);
1916
device_y += d6_to_int(text_info.lines[0].asc);
1918
} else if (render_context.evt_type == EVENT_VSCROLL) {
1919
if (render_context.scroll_direction == SCROLL_TB)
1920
device_y = y2scr(render_context.clip_y0 + render_context.scroll_shift) - (bbox.yMax - bbox.yMin);
1921
else if (render_context.scroll_direction == SCROLL_BT)
1922
device_y = y2scr(render_context.clip_y1 - render_context.scroll_shift);
1925
// positioned events are totally different
1926
if (render_context.evt_type == EVENT_POSITIONED) {
1929
mp_msg(MSGT_ASS, MSGL_DBG2, "positioned event at %d, %d\n", render_context.pos_x, render_context.pos_y);
1930
get_base_point(bbox, alignment, &base_x, &base_y);
1931
device_x = x2scr(render_context.pos_x) - base_x;
1932
device_y = y2scr(render_context.pos_y) - base_y;
1935
// fix clip coordinates (they depend on alignment)
1936
render_context.clip_x0 = x2scr(render_context.clip_x0);
1937
render_context.clip_x1 = x2scr(render_context.clip_x1);
1938
if (render_context.evt_type == EVENT_NORMAL ||
1939
render_context.evt_type == EVENT_HSCROLL ||
1940
render_context.evt_type == EVENT_VSCROLL) {
1941
if (valign == VALIGN_TOP) {
1942
render_context.clip_y0 = y2scr_top(render_context.clip_y0);
1943
render_context.clip_y1 = y2scr_top(render_context.clip_y1);
1944
} else if (valign == VALIGN_CENTER) {
1945
render_context.clip_y0 = y2scr(render_context.clip_y0);
1946
render_context.clip_y1 = y2scr(render_context.clip_y1);
1947
} else if (valign == VALIGN_SUB) {
1948
render_context.clip_y0 = y2scr_sub(render_context.clip_y0);
1949
render_context.clip_y1 = y2scr_sub(render_context.clip_y1);
1951
} else if (render_context.evt_type == EVENT_POSITIONED) {
1952
render_context.clip_y0 = y2scr(render_context.clip_y0);
1953
render_context.clip_y1 = y2scr(render_context.clip_y1);
1956
// calculate rotation parameters
1960
if (render_context.have_origin) {
1961
center.x = x2scr(render_context.org_x);
1962
center.y = y2scr(render_context.org_y);
1965
get_base_point(bbox, alignment, &bx, &by);
1966
center.x = device_x + bx;
1967
center.y = device_y + by;
1970
for (i = 0; i < text_info.length; ++i) {
1971
glyph_info_t* info = text_info.glyphs + i;
1973
if (info->hash_key.frx || info->hash_key.fry || info->hash_key.frz) {
1974
info->hash_key.shift_x = info->pos.x + device_x - center.x;
1975
info->hash_key.shift_y = - (info->pos.y + device_y - center.y);
1977
info->hash_key.shift_x = 0;
1978
info->hash_key.shift_y = 0;
1983
// convert glyphs to bitmaps
1984
for (i = 0; i < text_info.length; ++i)
1985
get_bitmap_glyph(text_info.glyphs + i);
1987
event_images->top = device_y - d6_to_int(text_info.lines[0].asc);
1988
event_images->height = d6_to_int(text_info.height);
1989
event_images->detect_collisions = render_context.detect_collisions;
1990
event_images->shift_direction = (valign == VALIGN_TOP) ? 1 : -1;
1991
event_images->event = event;
1992
event_images->imgs = render_text(&text_info, device_x, device_y);
1994
free_render_context();
2000
* \brief deallocate image list
2001
* \param img list pointer
2003
void ass_free_images(ass_image_t* img)
2006
ass_image_t* next = img->next;
2012
static void ass_reconfigure(ass_renderer_t* priv)
2014
priv->render_id = ++last_render_id;
2015
ass_glyph_cache_reset();
2016
ass_bitmap_cache_reset();
2017
ass_free_images(priv->prev_images_root);
2018
priv->prev_images_root = 0;
2021
void ass_set_frame_size(ass_renderer_t* priv, int w, int h)
2023
if (priv->settings.frame_width != w || priv->settings.frame_height != h) {
2024
priv->settings.frame_width = w;
2025
priv->settings.frame_height = h;
2026
if (priv->settings.aspect == 0.)
2027
priv->settings.aspect = ((double)w) / h;
2028
ass_reconfigure(priv);
2032
void ass_set_margins(ass_renderer_t* priv, int t, int b, int l, int r)
2034
if (priv->settings.left_margin != l ||
2035
priv->settings.right_margin != r ||
2036
priv->settings.top_margin != t ||
2037
priv->settings.bottom_margin != b) {
2038
priv->settings.left_margin = l;
2039
priv->settings.right_margin = r;
2040
priv->settings.top_margin = t;
2041
priv->settings.bottom_margin = b;
2042
ass_reconfigure(priv);
2046
void ass_set_use_margins(ass_renderer_t* priv, int use)
2048
priv->settings.use_margins = use;
2051
void ass_set_aspect_ratio(ass_renderer_t* priv, double ar)
2053
if (priv->settings.aspect != ar) {
2054
priv->settings.aspect = ar;
2055
ass_reconfigure(priv);
2059
void ass_set_font_scale(ass_renderer_t* priv, double font_scale)
2061
if (priv->settings.font_size_coeff != font_scale) {
2062
priv->settings.font_size_coeff = font_scale;
2063
ass_reconfigure(priv);
2067
void ass_set_hinting(ass_renderer_t* priv, ass_hinting_t ht)
2069
if (priv->settings.hinting != ht) {
2070
priv->settings.hinting = ht;
2071
ass_reconfigure(priv);
2075
int ass_set_fonts(ass_renderer_t* priv, const char* default_font, const char* default_family)
2077
if (priv->settings.default_font)
2078
free(priv->settings.default_font);
2079
if (priv->settings.default_family)
2080
free(priv->settings.default_family);
2082
priv->settings.default_font = default_font ? strdup(default_font) : 0;
2083
priv->settings.default_family = default_family ? strdup(default_family) : 0;
2085
if (priv->fontconfig_priv)
2086
fontconfig_done(priv->fontconfig_priv);
2087
priv->fontconfig_priv = fontconfig_init(priv->library, priv->ftlibrary, default_family, default_font);
2089
return !!priv->fontconfig_priv;
2093
* \brief Start a new frame
2095
static int ass_start_frame(ass_renderer_t *priv, ass_track_t* track, long long now)
2097
ass_renderer = priv;
2098
global_settings = &priv->settings;
2100
if (!priv->settings.frame_width && !priv->settings.frame_height)
2101
return 1; // library not initialized
2103
frame_context.ass_priv = priv;
2104
frame_context.width = global_settings->frame_width;
2105
frame_context.height = global_settings->frame_height;
2106
frame_context.orig_width = global_settings->frame_width - global_settings->left_margin - global_settings->right_margin;
2107
frame_context.orig_height = global_settings->frame_height - global_settings->top_margin - global_settings->bottom_margin;
2108
frame_context.track = track;
2109
frame_context.time = now;
2111
ass_lazy_track_init();
2113
frame_context.font_scale = global_settings->font_size_coeff *
2114
frame_context.orig_height / frame_context.track->PlayResY;
2115
frame_context.border_scale = ((double)frame_context.orig_height) / frame_context.track->PlayResY;
2117
if (frame_context.orig_width * track->PlayResY == frame_context.orig_height * track->PlayResX)
2118
frame_context.font_scale_x = 1.;
2120
frame_context.font_scale_x = ((double)(frame_context.orig_width * track->PlayResY)) / (frame_context.orig_height * track->PlayResX);
2122
priv->prev_images_root = priv->images_root;
2123
priv->images_root = 0;
2128
static int cmp_event_layer(const void* p1, const void* p2)
2130
ass_event_t* e1 = ((event_images_t*)p1)->event;
2131
ass_event_t* e2 = ((event_images_t*)p2)->event;
2132
if (e1->Layer < e2->Layer)
2134
if (e1->Layer > e2->Layer)
2136
if (e1->ReadOrder < e2->ReadOrder)
2138
if (e1->ReadOrder > e2->ReadOrder)
2143
#define MAX_EVENTS 100
2145
static render_priv_t* get_render_priv(ass_event_t* event)
2147
if (!event->render_priv)
2148
event->render_priv = calloc(1, sizeof(render_priv_t));
2149
// FIXME: check render_id
2150
if (ass_renderer->render_id != event->render_priv->render_id) {
2151
memset(event->render_priv, 0, sizeof(render_priv_t));
2152
event->render_priv->render_id = ass_renderer->render_id;
2154
return event->render_priv;
2157
typedef struct segment_s {
2158
int a, b; // top and height
2161
static int overlap(segment_t* s1, segment_t* s2)
2163
if (s1->a >= s2->b || s2->a >= s1->b)
2168
static int cmp_segment(const void* p1, const void* p2)
2170
return ((segment_t*)p1)->a - ((segment_t*)p2)->a;
2173
static void shift_event(event_images_t* ei, int shift)
2175
ass_image_t* cur = ei->imgs;
2177
cur->dst_y += shift;
2178
// clip top and bottom
2179
if (cur->dst_y < 0) {
2180
int clip = - cur->dst_y;
2182
cur->bitmap += clip * cur->stride;
2185
if (cur->dst_y + cur->h >= frame_context.height) {
2186
int clip = cur->dst_y + cur->h - frame_context.height;
2198
// dir: 1 - move down
2200
static int fit_segment(segment_t* s, segment_t* fixed, int* cnt, int dir)
2205
if (dir == 1) // move down
2206
for (i = 0; i < *cnt; ++i) {
2207
if (s->b + shift <= fixed[i].a || s->a + shift >= fixed[i].b)
2209
shift = fixed[i].b - s->a;
2211
else // dir == -1, move up
2212
for (i = *cnt-1; i >= 0; --i) {
2213
if (s->b + shift <= fixed[i].a || s->a + shift >= fixed[i].b)
2215
shift = fixed[i].a - s->b;
2218
fixed[*cnt].a = s->a + shift;
2219
fixed[*cnt].b = s->b + shift;
2221
qsort(fixed, *cnt, sizeof(segment_t), cmp_segment);
2226
static void fix_collisions(event_images_t* imgs, int cnt)
2228
segment_t used[MAX_EVENTS];
2232
// fill used[] with fixed events
2233
for (i = 0; i < cnt; ++i) {
2234
render_priv_t* priv;
2235
if (!imgs[i].detect_collisions) continue;
2236
priv = get_render_priv(imgs[i].event);
2237
if (priv->height > 0) { // it's a fixed event
2240
s.b = priv->top + priv->height;
2241
if (priv->height != imgs[i].height) { // no, it's not
2242
mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_EventHeightHasChanged);
2246
for (j = 0; j < cnt_used; ++j)
2247
if (overlap(&s, used + j)) { // no, it's not
2251
if (priv->height > 0) { // still a fixed event
2252
used[cnt_used].a = priv->top;
2253
used[cnt_used].b = priv->top + priv->height;
2255
shift_event(imgs + i, priv->top - imgs[i].top);
2259
qsort(used, cnt_used, sizeof(segment_t), cmp_segment);
2261
// try to fit other events in free spaces
2262
for (i = 0; i < cnt; ++i) {
2263
render_priv_t* priv;
2264
if (!imgs[i].detect_collisions) continue;
2265
priv = get_render_priv(imgs[i].event);
2266
if (priv->height == 0) { // not a fixed event
2270
s.b = imgs[i].top + imgs[i].height;
2271
shift = fit_segment(&s, used, &cnt_used, imgs[i].shift_direction);
2272
if (shift) shift_event(imgs + i, shift);
2274
priv->top = imgs[i].top;
2275
priv->height = imgs[i].height;
2282
* \brief compare two images
2283
* \param i1 first image
2284
* \param i2 second image
2285
* \return 0 if identical, 1 if different positions, 2 if different content
2287
int ass_image_compare(ass_image_t *i1, ass_image_t *i2)
2289
if (i1->w != i2->w) return 2;
2290
if (i1->h != i2->h) return 2;
2291
if (i1->stride != i2->stride) return 2;
2292
if (i1->color != i2->color) return 2;
2293
if (i1->bitmap != i2->bitmap)
2295
if (i1->dst_x != i2->dst_x) return 1;
2296
if (i1->dst_y != i2->dst_y) return 1;
2301
* \brief compare current and previous image list
2302
* \param priv library handle
2303
* \return 0 if identical, 1 if different positions, 2 if different content
2305
int ass_detect_change(ass_renderer_t *priv)
2307
ass_image_t* img, *img2;
2310
img = priv->prev_images_root;
2311
img2 = priv->images_root;
2313
while (img && diff < 2) {
2314
ass_image_t* next, *next2;
2317
int d = ass_image_compare(img, img2);
2318
if (d > diff) diff = d;
2321
// previous list is shorter
2329
// is the previous list longer?
2337
* \brief render a frame
2338
* \param priv library handle
2339
* \param track track
2340
* \param now current video timestamp (ms)
2341
* \param detect_change a value describing how the new images differ from the previous ones will be written here:
2342
* 0 if identical, 1 if different positions, 2 if different content.
2343
* Can be NULL, in that case no detection is performed.
2345
ass_image_t* ass_render_frame(ass_renderer_t *priv, ass_track_t* track, long long now, int* detect_change)
2348
event_images_t* last;
2352
rc = ass_start_frame(priv, track, now);
2356
// render events separately
2358
for (i = 0; i < track->n_events; ++i) {
2359
ass_event_t* event = track->events + i;
2360
if ( (event->Start <= now) && (now < (event->Start + event->Duration)) ) {
2361
if (cnt >= priv->eimg_size) {
2362
priv->eimg_size += 100;
2363
priv->eimg = realloc(priv->eimg, priv->eimg_size * sizeof(event_images_t));
2365
rc = ass_render_event(event, priv->eimg + cnt);
2371
qsort(priv->eimg, cnt, sizeof(event_images_t), cmp_event_layer);
2373
// call fix_collisions for each group of events with the same layer
2375
for (i = 1; i < cnt; ++i)
2376
if (last->event->Layer != priv->eimg[i].event->Layer) {
2377
fix_collisions(last, priv->eimg + i - last);
2378
last = priv->eimg + i;
2381
fix_collisions(last, priv->eimg + cnt - last);
2384
tail = &ass_renderer->images_root;
2385
for (i = 0; i < cnt; ++i) {
2386
ass_image_t* cur = priv->eimg[i].imgs;
2395
*detect_change = ass_detect_change(priv);
2397
// free the previous image list
2398
ass_free_images(priv->prev_images_root);
2399
priv->prev_images_root = 0;
2401
return ass_renderer->images_root;
added
removed
avidemux/ADM_libraries/ADM_libass/ass_render.c
