// -*- c-basic-offset: 8; indent-tabs-mode: t -*- // vim:ts=8:sw=8:noet:ai: /* * Copyright (C) 2006 Evgeniy Stepanov * * This file is part of libass. * * libass is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * libass is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with libass; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "config.h" #include #include #include #include #include FT_FREETYPE_H #include FT_STROKER_H #include FT_GLYPH_H #include FT_SYNTHESIS_H #include "mputils.h" #include "ass.h" #include "ass_font.h" #include "ass_bitmap.h" #include "ass_cache.h" #include "ass_utils.h" #include "ass_fontconfig.h" #include "ass_library.h" #define MAX_GLYPHS 3000 #define MAX_LINES 300 static int last_render_id = 0; typedef struct ass_settings_s { int frame_width; int frame_height; double font_size_coeff; // font size multiplier double line_spacing; // additional line spacing (in frame pixels) int top_margin; // height of top margin. Everything except toptitles is shifted down by top_margin. int bottom_margin; // height of bottom margin. (frame_height - top_margin - bottom_margin) is original video height. int left_margin; int right_margin; int use_margins; // 0 - place all subtitles inside original frame // 1 - use margins for placing toptitles and subtitles double aspect; // frame aspect ratio, d_width / d_height. ass_hinting_t hinting; char* default_font; char* default_family; } ass_settings_t; // a rendered event typedef struct event_images_s { ass_image_t* imgs; int top, height; int detect_collisions; int shift_direction; ass_event_t* event; } event_images_t; struct ass_renderer_s { ass_library_t* library; FT_Library ftlibrary; fc_instance_t* fontconfig_priv; ass_settings_t settings; int render_id; ass_synth_priv_t* synth_priv; ass_image_t* images_root; // rendering result is stored here ass_image_t* prev_images_root; event_images_t* eimg; // temporary buffer for sorting rendered events int eimg_size; // allocated buffer size }; typedef enum {EF_NONE = 0, EF_KARAOKE, EF_KARAOKE_KF, EF_KARAOKE_KO} effect_t; // describes a glyph // glyph_info_t and text_info_t are used for text centering and word-wrapping operations typedef struct glyph_info_s { unsigned symbol; FT_Glyph glyph; FT_Glyph outline_glyph; bitmap_t* bm; // glyph bitmap bitmap_t* bm_o; // outline bitmap bitmap_t* bm_s; // shadow bitmap FT_BBox bbox; FT_Vector pos; char linebreak; // the first (leading) glyph of some line ? uint32_t c[4]; // colors FT_Vector advance; // 26.6 effect_t effect_type; int effect_timing; // time duration of current karaoke word // after process_karaoke_effects: distance in pixels from the glyph origin. // part of the glyph to the left of it is displayed in a different color. int effect_skip_timing; // delay after the end of last karaoke word int asc, desc; // font max ascender and descender // int height; int be; // blur edges int shadow; double frx, fry, frz; // rotation bitmap_hash_key_t hash_key; } glyph_info_t; typedef struct line_info_s { int asc, desc; } line_info_t; typedef struct text_info_s { glyph_info_t* glyphs; int length; line_info_t lines[MAX_LINES]; int n_lines; int height; } text_info_t; // Renderer state. // Values like current font face, color, screen position, clipping and so on are stored here. typedef struct render_context_s { ass_event_t* event; ass_style_t* style; ass_font_t* font; char* font_path; double font_size; FT_Stroker stroker; int alignment; // alignment overrides go here; if zero, style value will be used double frx, fry, frz; enum { EVENT_NORMAL, // "normal" top-, sub- or mid- title EVENT_POSITIONED, // happens after pos(,), margins are ignored EVENT_HSCROLL, // "Banner" transition effect, text_width is unlimited EVENT_VSCROLL // "Scroll up", "Scroll down" transition effects } evt_type; double pos_x, pos_y; // position double org_x, org_y; // origin char have_origin; // origin is explicitly defined; if 0, get_base_point() is used double scale_x, scale_y; double hspacing; // distance between letters, in pixels double border; // outline width uint32_t c[4]; // colors(Primary, Secondary, so on) in RGBA int clip_x0, clip_y0, clip_x1, clip_y1; char detect_collisions; uint32_t fade; // alpha from \fad char be; // blur edges int shadow; int drawing_mode; // not implemented; when != 0 text is discarded, except for style override tags effect_t effect_type; int effect_timing; int effect_skip_timing; enum { SCROLL_LR, // left-to-right SCROLL_RL, SCROLL_TB, // top-to-bottom SCROLL_BT } scroll_direction; // for EVENT_HSCROLL, EVENT_VSCROLL int scroll_shift; // face properties char* family; unsigned bold; unsigned italic; } render_context_t; // frame-global data typedef struct frame_context_s { ass_renderer_t* ass_priv; int width, height; // screen dimensions int orig_height; // frame height ( = screen height - margins ) int orig_width; // frame width ( = screen width - margins ) int orig_height_nocrop; // frame height ( = screen height - margins + cropheight) int orig_width_nocrop; // frame width ( = screen width - margins + cropwidth) ass_track_t* track; long long time; // frame's timestamp, ms double font_scale; double font_scale_x; // x scale applied to all glyphs to preserve text aspect ratio double border_scale; } frame_context_t; static ass_renderer_t* ass_renderer; static ass_settings_t* global_settings; static text_info_t text_info; static render_context_t render_context; static frame_context_t frame_context; struct render_priv_s { int top, height; int render_id; }; static void ass_lazy_track_init(void) { ass_track_t* track = frame_context.track; if (track->PlayResX && track->PlayResY) return; if (!track->PlayResX && !track->PlayResY) { mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_NeitherPlayResXNorPlayResYDefined); track->PlayResX = 384; track->PlayResY = 288; } else { double orig_aspect = (global_settings->aspect * frame_context.height * frame_context.orig_width) / frame_context.orig_height / frame_context.width; if (!track->PlayResY) { track->PlayResY = track->PlayResX / orig_aspect + .5; mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_PlayResYUndefinedSettingY, track->PlayResY); } else if (!track->PlayResX) { track->PlayResX = track->PlayResY * orig_aspect + .5; mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_PlayResXUndefinedSettingX, track->PlayResX); } } } ass_renderer_t* ass_renderer_init(ass_library_t* library) { int error; FT_Library ft; ass_renderer_t* priv = 0; int vmajor, vminor, vpatch; memset(&render_context, 0, sizeof(render_context)); memset(&frame_context, 0, sizeof(frame_context)); memset(&text_info, 0, sizeof(text_info)); error = FT_Init_FreeType( &ft ); if ( error ) { mp_msg(MSGT_ASS, MSGL_FATAL, MSGTR_LIBASS_FT_Init_FreeTypeFailed); goto ass_init_exit; } FT_Library_Version(ft, &vmajor, &vminor, &vpatch); mp_msg(MSGT_ASS, MSGL_V, "FreeType library version: %d.%d.%d\n", vmajor, vminor, vpatch); mp_msg(MSGT_ASS, MSGL_V, "FreeType headers version: %d.%d.%d\n", FREETYPE_MAJOR, FREETYPE_MINOR, FREETYPE_PATCH); priv = calloc(1, sizeof(ass_renderer_t)); if (!priv) { FT_Done_FreeType(ft); goto ass_init_exit; } priv->synth_priv = ass_synth_init(); priv->library = library; priv->ftlibrary = ft; // images_root and related stuff is zero-filled in calloc ass_font_cache_init(); ass_bitmap_cache_init(); ass_glyph_cache_init(); text_info.glyphs = calloc(MAX_GLYPHS, sizeof(glyph_info_t)); ass_init_exit: if (priv) mp_msg(MSGT_ASS, MSGL_INFO, MSGTR_LIBASS_Init); else mp_msg(MSGT_ASS, MSGL_ERR, MSGTR_LIBASS_InitFailed); return priv; } void ass_renderer_done(ass_renderer_t* priv) { ass_font_cache_done(); ass_bitmap_cache_done(); ass_glyph_cache_done(); if (render_context.stroker) { FT_Stroker_Done(render_context.stroker); render_context.stroker = 0; } if (priv && priv->ftlibrary) FT_Done_FreeType(priv->ftlibrary); if (priv && priv->fontconfig_priv) fontconfig_done(priv->fontconfig_priv); if (priv && priv->synth_priv) ass_synth_done(priv->synth_priv); if (priv && priv->eimg) free(priv->eimg); if (priv) free(priv); if (text_info.glyphs) free(text_info.glyphs); } /** * \brief Create a new ass_image_t * Parameters are the same as ass_image_t fields. */ 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) { ass_image_t* img = calloc(1, sizeof(ass_image_t)); img->w = bitmap_w; img->h = bitmap_h; img->stride = stride; img->bitmap = bitmap; img->color = color; img->dst_x = dst_x; img->dst_y = dst_y; return img; } /** * \brief convert bitmap glyph into ass_image_t struct(s) * \param bit freetype bitmap glyph, FT_PIXEL_MODE_GRAY * \param dst_x bitmap x coordinate in video frame * \param dst_y bitmap y coordinate in video frame * \param color first color, RGBA * \param color2 second color, RGBA * \param brk x coordinate relative to glyph origin, color is used to the left of brk, color2 - to the right * \param tail pointer to the last image's next field, head of the generated list should be stored here * \return pointer to the new list tail * Performs clipping. Uses my_draw_bitmap for actual bitmap convertion. */ 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) { // brk is relative to dst_x // color = color left of brk // color2 = color right of brk int b_x0, b_y0, b_x1, b_y1; // visible part of the bitmap int clip_x0, clip_y0, clip_x1, clip_y1; int tmp; ass_image_t* img; dst_x += bm->left; dst_y += bm->top; brk -= bm->left; // clipping clip_x0 = render_context.clip_x0; clip_y0 = render_context.clip_y0; clip_x1 = render_context.clip_x1; clip_y1 = render_context.clip_y1; b_x0 = 0; b_y0 = 0; b_x1 = bm->w; b_y1 = bm->h; tmp = dst_x - clip_x0; if (tmp < 0) { mp_msg(MSGT_ASS, MSGL_DBG2, "clip left\n"); b_x0 = - tmp; } tmp = dst_y - clip_y0; if (tmp < 0) { mp_msg(MSGT_ASS, MSGL_DBG2, "clip top\n"); b_y0 = - tmp; } tmp = clip_x1 - dst_x - bm->w; if (tmp < 0) { mp_msg(MSGT_ASS, MSGL_DBG2, "clip right\n"); b_x1 = bm->w + tmp; } tmp = clip_y1 - dst_y - bm->h; if (tmp < 0) { mp_msg(MSGT_ASS, MSGL_DBG2, "clip bottom\n"); b_y1 = bm->h + tmp; } if ((b_y0 >= b_y1) || (b_x0 >= b_x1)) return tail; if (brk > b_x0) { // draw left part if (brk > b_x1) brk = b_x1; img = my_draw_bitmap(bm->buffer + bm->w * b_y0 + b_x0, brk - b_x0, b_y1 - b_y0, bm->w, dst_x + b_x0, dst_y + b_y0, color); *tail = img; tail = &img->next; } if (brk < b_x1) { // draw right part if (brk < b_x0) brk = b_x0; img = my_draw_bitmap(bm->buffer + bm->w * b_y0 + brk, b_x1 - brk, b_y1 - b_y0, bm->w, dst_x + brk, dst_y + b_y0, color2); *tail = img; tail = &img->next; } return tail; } /** * \brief Convert text_info_t struct to ass_image_t list * Splits glyphs in halves when needed (for \kf karaoke). */ static ass_image_t* render_text(text_info_t* text_info, int dst_x, int dst_y) { int pen_x, pen_y; int i; bitmap_t* bm; ass_image_t* head; ass_image_t** tail = &head; for (i = 0; i < text_info->length; ++i) { glyph_info_t* info = text_info->glyphs + i; if ((info->symbol == 0) || (info->symbol == '\n') || !info->bm_s || (info->shadow == 0)) continue; pen_x = dst_x + info->pos.x + info->shadow; pen_y = dst_y + info->pos.y + info->shadow; bm = info->bm_s; tail = render_glyph(bm, pen_x, pen_y, info->c[3], 0, 1000000, tail); } for (i = 0; i < text_info->length; ++i) { glyph_info_t* info = text_info->glyphs + i; if ((info->symbol == 0) || (info->symbol == '\n') || !info->bm_o) continue; pen_x = dst_x + info->pos.x; pen_y = dst_y + info->pos.y; bm = info->bm_o; if ((info->effect_type == EF_KARAOKE_KO) && (info->effect_timing <= info->bbox.xMax)) { // do nothing } else tail = render_glyph(bm, pen_x, pen_y, info->c[2], 0, 1000000, tail); } for (i = 0; i < text_info->length; ++i) { glyph_info_t* info = text_info->glyphs + i; if ((info->symbol == 0) || (info->symbol == '\n') || !info->bm) continue; pen_x = dst_x + info->pos.x; pen_y = dst_y + info->pos.y; bm = info->bm; if ((info->effect_type == EF_KARAOKE) || (info->effect_type == EF_KARAOKE_KO)) { if (info->effect_timing > info->bbox.xMax) tail = render_glyph(bm, pen_x, pen_y, info->c[0], 0, 1000000, tail); else tail = render_glyph(bm, pen_x, pen_y, info->c[1], 0, 1000000, tail); } else if (info->effect_type == EF_KARAOKE_KF) { tail = render_glyph(bm, pen_x, pen_y, info->c[0], info->c[1], info->effect_timing, tail); } else tail = render_glyph(bm, pen_x, pen_y, info->c[0], 0, 1000000, tail); } *tail = 0; return head; } /** * \brief Mapping between script and screen coordinates */ static int x2scr(double x) { return x*frame_context.orig_width_nocrop / frame_context.track->PlayResX + FFMAX(global_settings->left_margin, 0); } /** * \brief Mapping between script and screen coordinates */ static int y2scr(double y) { return y * frame_context.orig_height_nocrop / frame_context.track->PlayResY + FFMAX(global_settings->top_margin, 0); } // the same for toptitles static int y2scr_top(double y) { if (global_settings->use_margins) return y * frame_context.orig_height_nocrop / frame_context.track->PlayResY; else return y * frame_context.orig_height_nocrop / frame_context.track->PlayResY + FFMAX(global_settings->top_margin, 0); } // the same for subtitles static int y2scr_sub(double y) { if (global_settings->use_margins) return y * frame_context.orig_height_nocrop / frame_context.track->PlayResY + FFMAX(global_settings->top_margin, 0) + FFMAX(global_settings->bottom_margin, 0); else return y * frame_context.orig_height_nocrop / frame_context.track->PlayResY + FFMAX(global_settings->top_margin, 0); } static void compute_string_bbox( text_info_t* info, FT_BBox *abbox ) { FT_BBox bbox; int i; if (text_info.length > 0) { bbox.xMin = 32000; bbox.xMax = -32000; bbox.yMin = - d6_to_int(text_info.lines[0].asc) + text_info.glyphs[0].pos.y; bbox.yMax = d6_to_int(text_info.height - text_info.lines[0].asc) + text_info.glyphs[0].pos.y; for (i = 0; i < text_info.length; ++i) { int s = text_info.glyphs[i].pos.x; int e = s + d6_to_int(text_info.glyphs[i].advance.x); bbox.xMin = FFMIN(bbox.xMin, s); bbox.xMax = FFMAX(bbox.xMax, e); } } else bbox.xMin = bbox.xMax = bbox.yMin = bbox.yMax = 0; /* return string bbox */ *abbox = bbox; } /** * \brief Check if starting part of (*p) matches sample. If true, shift p to the first symbol after the matching part. */ static inline int mystrcmp(char** p, const char* sample) { int len = strlen(sample); if (strncmp(*p, sample, len) == 0) { (*p) += len; return 1; } else return 0; } static void change_font_size(double sz) { double size = sz * frame_context.font_scale; if (size < 1) size = 1; else if (size > frame_context.height * 2) size = frame_context.height * 2; ass_font_set_size(render_context.font, size); render_context.font_size = sz; } /** * \brief Change current font, using setting from render_context. */ static void update_font(void) { unsigned val; ass_renderer_t* priv = frame_context.ass_priv; ass_font_desc_t desc; desc.family = strdup(render_context.family); val = render_context.bold; // 0 = normal, 1 = bold, >1 = exact weight if (val == 0) val = 80; // normal else if (val == 1) val = 200; // bold desc.bold = val; val = render_context.italic; if (val == 0) val = 0; // normal else if (val == 1) val = 110; //italic desc.italic = val; render_context.font = ass_font_new(priv->library, priv->ftlibrary, priv->fontconfig_priv, &desc); free(desc.family); if (render_context.font) change_font_size(render_context.font_size); } /** * \brief Change border width * negative value resets border to style value */ static void change_border(double border) { int b; if (!render_context.font) return; if (border < 0) { if (render_context.style->BorderStyle == 1) { if (render_context.style->Outline == 0 && render_context.style->Shadow > 0) border = 1.; else border = render_context.style->Outline; } else border = 1.; } render_context.border = border; b = 64 * border * frame_context.border_scale; if (b > 0) { if (!render_context.stroker) { int error; #if (FREETYPE_MAJOR > 2) || ((FREETYPE_MAJOR == 2) && (FREETYPE_MINOR > 1)) error = FT_Stroker_New( ass_renderer->ftlibrary, &render_context.stroker ); #else // < 2.2 error = FT_Stroker_New( render_context.font->faces[0]->memory, &render_context.stroker ); #endif if (error) { mp_msg(MSGT_ASS, MSGL_V, "failed to get stroker\n"); render_context.stroker = 0; } } if (render_context.stroker) FT_Stroker_Set( render_context.stroker, b, FT_STROKER_LINECAP_ROUND, FT_STROKER_LINEJOIN_ROUND, 0 ); } else { FT_Stroker_Done(render_context.stroker); render_context.stroker = 0; } } #define _r(c) ((c)>>24) #define _g(c) (((c)>>16)&0xFF) #define _b(c) (((c)>>8)&0xFF) #define _a(c) ((c)&0xFF) /** * \brief Calculate a weighted average of two colors * calculates c1*(1-a) + c2*a, but separately for each component except alpha */ static void change_color(uint32_t* var, uint32_t new, double pwr) { (*var)= ((uint32_t)(_r(*var) * (1 - pwr) + _r(new) * pwr) << 24) + ((uint32_t)(_g(*var) * (1 - pwr) + _g(new) * pwr) << 16) + ((uint32_t)(_b(*var) * (1 - pwr) + _b(new) * pwr) << 8) + _a(*var); } // like change_color, but for alpha component only static void change_alpha(uint32_t* var, uint32_t new, double pwr) { *var = (_r(*var) << 24) + (_g(*var) << 16) + (_b(*var) << 8) + (_a(*var) * (1 - pwr) + _a(new) * pwr); } /** * \brief Multiply two alpha values * \param a first value * \param b second value * \return result of multiplication * Parameters and result are limited by 0xFF. */ static uint32_t mult_alpha(uint32_t a, uint32_t b) { return 0xFF - (0xFF - a) * (0xFF - b) / 0xFF; } /** * \brief Calculate alpha value by piecewise linear function * Used for \fad, \fade implementation. */ static unsigned interpolate_alpha(long long now, long long t1, long long t2, long long t3, long long t4, unsigned a1, unsigned a2, unsigned a3) { unsigned a; double cf; if (now <= t1) { a = a1; } else if (now >= t4) { a = a3; } else if (now < t2) { // and > t1 cf = ((double)(now - t1)) / (t2 - t1); a = a1 * (1 - cf) + a2 * cf; } else if (now > t3) { cf = ((double)(now - t3)) / (t4 - t3); a = a2 * (1 - cf) + a3 * cf; } else { // t2 <= now <= t3 a = a2; } return a; } static void reset_render_context(void); /** * \brief Parse style override tag. * \param p string to parse * \param pwr multiplier for some tag effects (comes from \t tags) */ static char* parse_tag(char* p, double pwr) { #define skip_to(x) while ((*p != (x)) && (*p != '}') && (*p != 0)) { ++p;} #define skip(x) if (*p == (x)) ++p; else { return p; } skip_to('\\'); skip('\\'); if ((*p == '}') || (*p == 0)) return p; if (mystrcmp(&p, "fsc")) { char tp = *p++; double val; if (tp == 'x') { if (mystrtod(&p, &val)) { val /= 100; render_context.scale_x = render_context.scale_x * ( 1 - pwr) + val * pwr; } else render_context.scale_x = render_context.style->ScaleX; } else if (tp == 'y') { if (mystrtod(&p, &val)) { val /= 100; render_context.scale_y = render_context.scale_y * ( 1 - pwr) + val * pwr; } else render_context.scale_y = render_context.style->ScaleY; } } else if (mystrcmp(&p, "fsp")) { double val; if (mystrtod(&p, &val)) render_context.hspacing = render_context.hspacing * ( 1 - pwr ) + val * pwr; else render_context.hspacing = render_context.style->Spacing; } else if (mystrcmp(&p, "fs")) { double val; if (mystrtod(&p, &val)) val = render_context.font_size * ( 1 - pwr ) + val * pwr; else val = render_context.style->FontSize; if (render_context.font) change_font_size(val); } else if (mystrcmp(&p, "bord")) { double val; if (mystrtod(&p, &val)) val = render_context.border * ( 1 - pwr ) + val * pwr; else val = -1.; // reset to default change_border(val); } else if (mystrcmp(&p, "move")) { int x1, x2, y1, y2; long long t1, t2, delta_t, t; double x, y; double k; skip('('); x1 = strtol(p, &p, 10); skip(','); y1 = strtol(p, &p, 10); skip(','); x2 = strtol(p, &p, 10); skip(','); y2 = strtol(p, &p, 10); if (*p == ',') { skip(','); t1 = strtoll(p, &p, 10); skip(','); t2 = strtoll(p, &p, 10); mp_msg(MSGT_ASS, MSGL_DBG2, "movement6: (%d, %d) -> (%d, %d), (%" PRId64 " .. %" PRId64 ")\n", x1, y1, x2, y2, (int64_t)t1, (int64_t)t2); } else { t1 = 0; t2 = render_context.event->Duration; mp_msg(MSGT_ASS, MSGL_DBG2, "movement: (%d, %d) -> (%d, %d)\n", x1, y1, x2, y2); } skip(')'); delta_t = t2 - t1; t = frame_context.time - render_context.event->Start; if (t < t1) k = 0.; else if (t > t2) k = 1.; else k = ((double)(t - t1)) / delta_t; x = k * (x2 - x1) + x1; y = k * (y2 - y1) + y1; render_context.pos_x = x; render_context.pos_y = y; render_context.detect_collisions = 0; render_context.evt_type = EVENT_POSITIONED; } else if (mystrcmp(&p, "frx")) { double val; if (mystrtod(&p, &val)) { val *= M_PI / 180; render_context.frx = val * pwr + render_context.frx * (1-pwr); } else render_context.frx = 0.; } else if (mystrcmp(&p, "fry")) { double val; if (mystrtod(&p, &val)) { val *= M_PI / 180; render_context.fry = val * pwr + render_context.fry * (1-pwr); } else render_context.fry = 0.; } else if (mystrcmp(&p, "frz") || mystrcmp(&p, "fr")) { double val; if (mystrtod(&p, &val)) { val *= M_PI / 180; render_context.frz = val * pwr + render_context.frz * (1-pwr); } else render_context.frz = M_PI * render_context.style->Angle / 180.; } else if (mystrcmp(&p, "fn")) { char* start = p; char* family; skip_to('\\'); if (p > start) { family = malloc(p - start + 1); strncpy(family, start, p - start); family[p - start] = '\0'; } else family = strdup(render_context.style->FontName); if (render_context.family) free(render_context.family); render_context.family = family; update_font(); } else if (mystrcmp(&p, "alpha")) { uint32_t val; int i; if (strtocolor(&p, &val)) { unsigned char a = val >> 24; for (i = 0; i < 4; ++i) change_alpha(&render_context.c[i], a, pwr); } else { change_alpha(&render_context.c[0], render_context.style->PrimaryColour, pwr); change_alpha(&render_context.c[1], render_context.style->SecondaryColour, pwr); change_alpha(&render_context.c[2], render_context.style->OutlineColour, pwr); change_alpha(&render_context.c[3], render_context.style->BackColour, pwr); } // FIXME: simplify } else if (mystrcmp(&p, "an")) { int val; if (mystrtoi(&p, 10, &val) && val) { int v = (val - 1) / 3; // 0, 1 or 2 for vertical alignment mp_msg(MSGT_ASS, MSGL_DBG2, "an %d\n", val); if (v != 0) v = 3 - v; val = ((val - 1) % 3) + 1; // horizontal alignment val += v*4; mp_msg(MSGT_ASS, MSGL_DBG2, "align %d\n", val); render_context.alignment = val; } else render_context.alignment = render_context.style->Alignment; } else if (mystrcmp(&p, "a")) { int val; if (mystrtoi(&p, 10, &val) && val) render_context.alignment = val; else render_context.alignment = render_context.style->Alignment; } else if (mystrcmp(&p, "pos")) { int v1, v2; skip('('); v1 = strtol(p, &p, 10); skip(','); v2 = strtol(p, &p, 10); skip(')'); mp_msg(MSGT_ASS, MSGL_DBG2, "pos(%d, %d)\n", v1, v2); render_context.evt_type = EVENT_POSITIONED; render_context.detect_collisions = 0; render_context.pos_x = v1; render_context.pos_y = v2; } else if (mystrcmp(&p, "fad")) { int a1, a2, a3; long long t1, t2, t3, t4; if (*p == 'e') ++p; // either \fad or \fade skip('('); a1 = strtol(p, &p, 10); skip(','); a2 = strtol(p, &p, 10); if (*p == ')') { // 2-argument version (\fad, according to specs) // a1 and a2 are fade-in and fade-out durations t1 = 0; t4 = render_context.event->Duration; t2 = a1; t3 = t4 - a2; a1 = 0xFF; a2 = 0; a3 = 0xFF; } else { // 6-argument version (\fade) // a1 and a2 (and a3) are opacity values skip(','); a3 = strtol(p, &p, 10); skip(','); t1 = strtoll(p, &p, 10); skip(','); t2 = strtoll(p, &p, 10); skip(','); t3 = strtoll(p, &p, 10); skip(','); t4 = strtoll(p, &p, 10); } skip(')'); render_context.fade = interpolate_alpha(frame_context.time - render_context.event->Start, t1, t2, t3, t4, a1, a2, a3); } else if (mystrcmp(&p, "org")) { int v1, v2; skip('('); v1 = strtol(p, &p, 10); skip(','); v2 = strtol(p, &p, 10); skip(')'); mp_msg(MSGT_ASS, MSGL_DBG2, "org(%d, %d)\n", v1, v2); // render_context.evt_type = EVENT_POSITIONED; render_context.org_x = v1; render_context.org_y = v2; render_context.have_origin = 1; render_context.detect_collisions = 0; } else if (mystrcmp(&p, "t")) { double v[3]; int v1, v2; double v3; int cnt; long long t1, t2, t, delta_t; double k; skip('('); for (cnt = 0; cnt < 3; ++cnt) { if (*p == '\\') break; v[cnt] = strtod(p, &p); skip(','); } if (cnt == 3) { v1 = v[0]; v2 = v[1]; v3 = v[2]; } else if (cnt == 2) { v1 = v[0]; v2 = v[1]; v3 = 1.; } else if (cnt == 1) { v1 = 0; v2 = render_context.event->Duration; v3 = v[0]; } else { // cnt == 0 v1 = 0; v2 = render_context.event->Duration; v3 = 1.; } render_context.detect_collisions = 0; t1 = v1; t2 = v2; delta_t = v2 - v1; if (v3 < 0.) v3 = 0.; t = frame_context.time - render_context.event->Start; // FIXME: move to render_context if (t <= t1) k = 0.; else if (t >= t2) k = 1.; else { assert(delta_t != 0.); k = pow(((double)(t - t1)) / delta_t, v3); } while (*p == '\\') p = parse_tag(p, k); // maybe k*pwr ? no, specs forbid nested \t's skip_to(')'); // in case there is some unknown tag or a comment skip(')'); } else if (mystrcmp(&p, "clip")) { int x0, y0, x1, y1; int res = 1; skip('('); res &= mystrtoi(&p, 10, &x0); skip(','); res &= mystrtoi(&p, 10, &y0); skip(','); res &= mystrtoi(&p, 10, &x1); skip(','); res &= mystrtoi(&p, 10, &y1); skip(')'); if (res) { render_context.clip_x0 = render_context.clip_x0 * (1-pwr) + x0 * pwr; render_context.clip_x1 = render_context.clip_x1 * (1-pwr) + x1 * pwr; render_context.clip_y0 = render_context.clip_y0 * (1-pwr) + y0 * pwr; render_context.clip_y1 = render_context.clip_y1 * (1-pwr) + y1 * pwr; } else { render_context.clip_x0 = 0; render_context.clip_y0 = 0; render_context.clip_x1 = frame_context.track->PlayResX; render_context.clip_y1 = frame_context.track->PlayResY; } } else if (mystrcmp(&p, "c")) { uint32_t val; if (!strtocolor(&p, &val)) val = render_context.style->PrimaryColour; mp_msg(MSGT_ASS, MSGL_DBG2, "color: %X\n", val); change_color(&render_context.c[0], val, pwr); } else if ((*p >= '1') && (*p <= '4') && (++p) && (mystrcmp(&p, "c") || mystrcmp(&p, "a"))) { char n = *(p-2); int cidx = n - '1'; char cmd = *(p-1); uint32_t val; assert((n >= '1') && (n <= '4')); if (!strtocolor(&p, &val)) switch(n) { case '1': val = render_context.style->PrimaryColour; break; case '2': val = render_context.style->SecondaryColour; break; case '3': val = render_context.style->OutlineColour; break; case '4': val = render_context.style->BackColour; break; default : val = 0; break; // impossible due to assert; avoid compilation warning } switch (cmd) { case 'c': change_color(render_context.c + cidx, val, pwr); break; case 'a': change_alpha(render_context.c + cidx, val >> 24, pwr); break; default: mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_BadCommand, n, cmd); break; } mp_msg(MSGT_ASS, MSGL_DBG2, "single c/a at %f: %c%c = %X \n", pwr, n, cmd, render_context.c[cidx]); } else if (mystrcmp(&p, "r")) { reset_render_context(); } else if (mystrcmp(&p, "be")) { int val; if (mystrtoi(&p, 10, &val)) render_context.be = val ? 1 : 0; else render_context.be = 0; } else if (mystrcmp(&p, "b")) { int b; if (mystrtoi(&p, 10, &b)) { if (pwr >= .5) render_context.bold = b; } else render_context.bold = render_context.style->Bold; update_font(); } else if (mystrcmp(&p, "i")) { int i; if (mystrtoi(&p, 10, &i)) { if (pwr >= .5) render_context.italic = i; } else render_context.italic = render_context.style->Italic; update_font(); } else if (mystrcmp(&p, "kf") || mystrcmp(&p, "K")) { int val = strtol(p, &p, 10); render_context.effect_type = EF_KARAOKE_KF; if (render_context.effect_timing) render_context.effect_skip_timing += render_context.effect_timing; render_context.effect_timing = val * 10; } else if (mystrcmp(&p, "ko")) { int val = strtol(p, &p, 10); render_context.effect_type = EF_KARAOKE_KO; if (render_context.effect_timing) render_context.effect_skip_timing += render_context.effect_timing; render_context.effect_timing = val * 10; } else if (mystrcmp(&p, "k")) { int val = strtol(p, &p, 10); render_context.effect_type = EF_KARAOKE; if (render_context.effect_timing) render_context.effect_skip_timing += render_context.effect_timing; render_context.effect_timing = val * 10; } else if (mystrcmp(&p, "shad")) { int val; if (mystrtoi(&p, 10, &val)) render_context.shadow = val; else render_context.shadow = render_context.style->Shadow; } else if (mystrcmp(&p, "pbo")) { (void)strtol(p, &p, 10); // ignored } else if (mystrcmp(&p, "p")) { int val; if (!mystrtoi(&p, 10, &val)) val = 0; render_context.drawing_mode = !!val; } return p; #undef skip #undef skip_to } /** * \brief Get next ucs4 char from string, parsing and executing style overrides * \param str string pointer * \return ucs4 code of the next char * On return str points to the unparsed part of the string */ static unsigned get_next_char(char** str) { char* p = *str; unsigned chr; if (*p == '{') { // '\0' goes here p++; while (1) { p = parse_tag(p, 1.); if (*p == '}') { // end of tag p++; if (*p == '{') { p++; continue; } else break; } else if (*p != '\\') mp_msg(MSGT_ASS, MSGL_V, "Unable to parse: \"%s\" \n", p); if (*p == 0) break; } } if (*p == '\t') { ++p; *str = p; return ' '; } if (*p == '\\') { if ((*(p+1) == 'N') || ((*(p+1) == 'n') && (frame_context.track->WrapStyle == 2))) { p += 2; *str = p; return '\n'; } else if ((*(p+1) == 'n') || (*(p+1) == 'h')) { p += 2; *str = p; return ' '; } } chr = utf8_get_char(&p); *str = p; return chr; } static void apply_transition_effects(ass_event_t* event) { int v[4]; int cnt; char* p = event->Effect; if (!p || !*p) return; cnt = 0; while (cnt < 4 && (p = strchr(p, ';'))) { v[cnt++] = atoi(++p); } if (strncmp(event->Effect, "Banner;", 7) == 0) { int delay; if (cnt < 1) { mp_msg(MSGT_ASS, MSGL_V, "Error parsing effect: %s \n", event->Effect); return; } if (cnt >= 2 && v[1] == 0) // right-to-left render_context.scroll_direction = SCROLL_RL; else // left-to-right render_context.scroll_direction = SCROLL_LR; delay = v[0]; if (delay == 0) delay = 1; // ? render_context.scroll_shift = (frame_context.time - render_context.event->Start) / delay; render_context.evt_type = EVENT_HSCROLL; return; } if (strncmp(event->Effect, "Scroll up;", 10) == 0) { render_context.scroll_direction = SCROLL_BT; } else if (strncmp(event->Effect, "Scroll down;", 12) == 0) { render_context.scroll_direction = SCROLL_TB; } else { mp_msg(MSGT_ASS, MSGL_V, "Unknown transition effect: %s \n", event->Effect); return; } // parse scroll up/down parameters { int delay; int y0, y1; if (cnt < 3) { mp_msg(MSGT_ASS, MSGL_V, "Error parsing effect: %s \n", event->Effect); return; } delay = v[2]; if (delay == 0) delay = 1; // ? render_context.scroll_shift = (frame_context.time - render_context.event->Start) / delay; if (v[0] < v[1]) { y0 = v[0]; y1 = v[1]; } else { y0 = v[1]; y1 = v[0]; } if (y1 == 0) y1 = frame_context.track->PlayResY; // y0=y1=0 means fullscreen scrolling render_context.clip_y0 = y0; render_context.clip_y1 = y1; render_context.evt_type = EVENT_VSCROLL; render_context.detect_collisions = 0; } } /** * \brief partially reset render_context to style values * Works like {\r}: resets some style overrides */ static void reset_render_context(void) { render_context.c[0] = render_context.style->PrimaryColour; render_context.c[1] = render_context.style->SecondaryColour; render_context.c[2] = render_context.style->OutlineColour; render_context.c[3] = render_context.style->BackColour; render_context.font_size = render_context.style->FontSize; if (render_context.family) free(render_context.family); render_context.family = strdup(render_context.style->FontName); render_context.bold = render_context.style->Bold; render_context.italic = render_context.style->Italic; update_font(); change_border(-1.); render_context.scale_x = render_context.style->ScaleX; render_context.scale_y = render_context.style->ScaleY; render_context.hspacing = render_context.style->Spacing; render_context.be = 0; render_context.shadow = render_context.style->Shadow; render_context.frx = render_context.fry = 0.; render_context.frz = M_PI * render_context.style->Angle / 180.; // FIXME: does not reset unsupported attributes. } /** * \brief Start new event. Reset render_context. */ static void init_render_context(ass_event_t* event) { render_context.event = event; render_context.style = frame_context.track->styles + event->Style; reset_render_context(); render_context.evt_type = EVENT_NORMAL; render_context.alignment = render_context.style->Alignment; render_context.pos_x = 0; render_context.pos_y = 0; render_context.org_x = 0; render_context.org_y = 0; render_context.have_origin = 0; render_context.clip_x0 = 0; render_context.clip_y0 = 0; render_context.clip_x1 = frame_context.track->PlayResX; render_context.clip_y1 = frame_context.track->PlayResY; render_context.detect_collisions = 1; render_context.fade = 0; render_context.drawing_mode = 0; render_context.effect_type = EF_NONE; render_context.effect_timing = 0; render_context.effect_skip_timing = 0; apply_transition_effects(event); } static void free_render_context(void) { } /** * \brief Get normal and outline (border) glyphs * \param symbol ucs4 char * \param info out: struct filled with extracted data * \param advance subpixel shift vector used for cache lookup * Tries to get both glyphs from cache. * If they can't be found, gets a glyph from font face, generates outline with FT_Stroker, * and add them to cache. * The glyphs are returned in info->glyph and info->outline_glyph */ static void get_outline_glyph(int symbol, glyph_info_t* info, FT_Vector* advance) { int error; glyph_hash_val_t* val; glyph_hash_key_t key; key.font = render_context.font; key.size = render_context.font_size; key.ch = symbol; key.scale_x = (render_context.scale_x * 0xFFFF); key.scale_y = (render_context.scale_y * 0xFFFF); key.advance = *advance; key.bold = render_context.bold; key.italic = render_context.italic; key.outline = render_context.border * 0xFFFF; info->glyph = info->outline_glyph = 0; val = cache_find_glyph(&key); if (val) { FT_Glyph_Copy(val->glyph, &info->glyph); if (val->outline_glyph) FT_Glyph_Copy(val->outline_glyph, &info->outline_glyph); info->bbox = val->bbox_scaled; info->advance.x = val->advance.x; info->advance.y = val->advance.y; } else { glyph_hash_val_t v; info->glyph = ass_font_get_glyph(frame_context.ass_priv->fontconfig_priv, render_context.font, symbol, global_settings->hinting); if (!info->glyph) return; info->advance.x = d16_to_d6(info->glyph->advance.x); info->advance.y = d16_to_d6(info->glyph->advance.y); FT_Glyph_Get_CBox( info->glyph, FT_GLYPH_BBOX_PIXELS, &info->bbox); if (render_context.stroker) { info->outline_glyph = info->glyph; error = FT_Glyph_StrokeBorder( &(info->outline_glyph), render_context.stroker, 0 , 0 ); // don't destroy original if (error) { mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_FT_Glyph_Stroke_Error, error); } } memset(&v, 0, sizeof(v)); FT_Glyph_Copy(info->glyph, &v.glyph); if (info->outline_glyph) FT_Glyph_Copy(info->outline_glyph, &v.outline_glyph); v.advance = info->advance; v.bbox_scaled = info->bbox; cache_add_glyph(&key, &v); } } static void transform_3d(FT_Vector shift, FT_Glyph* glyph, FT_Glyph* glyph2, double frx, double fry, double frz); /** * \brief Get bitmaps for a glyph * \param info glyph info * Tries to get glyph bitmaps from bitmap cache. * If they can't be found, they are generated by rotating and rendering the glyph. * After that, bitmaps are added to the cache. * They are returned in info->bm (glyph), info->bm_o (outline) and info->bm_s (shadow). */ static void get_bitmap_glyph(glyph_info_t* info) { bitmap_hash_val_t* val; bitmap_hash_key_t* key = &info->hash_key; val = cache_find_bitmap(key); /* val = 0; */ if (val) { info->bm = val->bm; info->bm_o = val->bm_o; info->bm_s = val->bm_s; } else { FT_Vector shift; bitmap_hash_val_t hash_val; int error; info->bm = info->bm_o = info->bm_s = 0; if (info->glyph && info->symbol != '\n' && info->symbol != 0) { // calculating rotation shift vector (from rotation origin to the glyph basepoint) shift.x = int_to_d6(info->hash_key.shift_x); shift.y = int_to_d6(info->hash_key.shift_y); // apply rotation transform_3d(shift, &info->glyph, &info->outline_glyph, info->frx, info->fry, info->frz); // render glyph error = glyph_to_bitmap(ass_renderer->synth_priv, info->glyph, info->outline_glyph, &info->bm, &info->bm_o, &info->bm_s, info->be); if (error) info->symbol = 0; // add bitmaps to cache hash_val.bm_o = info->bm_o; hash_val.bm = info->bm; hash_val.bm_s = info->bm_s; cache_add_bitmap(&(info->hash_key), &hash_val); } } // deallocate glyphs if (info->glyph) FT_Done_Glyph(info->glyph); if (info->outline_glyph) FT_Done_Glyph(info->outline_glyph); } /** * This function goes through text_info and calculates text parameters. * The following text_info fields are filled: * height * lines[].height * lines[].asc * lines[].desc */ static void measure_text(void) { int cur_line = 0, max_asc = 0, max_desc = 0; int i; text_info.height = 0; for (i = 0; i < text_info.length + 1; ++i) { if ((i == text_info.length) || text_info.glyphs[i].linebreak) { text_info.lines[cur_line].asc = max_asc; text_info.lines[cur_line].desc = max_desc; text_info.height += max_asc + max_desc; cur_line ++; max_asc = max_desc = 0; } if (i < text_info.length) { glyph_info_t* cur = text_info.glyphs + i; if (cur->asc > max_asc) max_asc = cur->asc; if (cur->desc > max_desc) max_desc = cur->desc; } } text_info.height += (text_info.n_lines - 1) * double_to_d6(global_settings->line_spacing); } /** * \brief rearrange text between lines * \param max_text_width maximal text line width in pixels * The algo is similar to the one in libvo/sub.c: * 1. Place text, wrapping it when current line is full * 2. Try moving words from the end of a line to the beginning of the next one while it reduces * the difference in lengths between this two lines. * The result may not be optimal, but usually is good enough. */ static void wrap_lines_smart(int max_text_width) { int i, j; glyph_info_t *cur, *s1, *e1, *s2, *s3, *w; int last_space; int break_type; int exit; int pen_shift_x; int pen_shift_y; int cur_line; last_space = -1; text_info.n_lines = 1; break_type = 0; s1 = text_info.glyphs; // current line start for (i = 0; i < text_info.length; ++i) { int break_at, s_offset, len; cur = text_info.glyphs + i; break_at = -1; s_offset = s1->bbox.xMin + s1->pos.x; len = (cur->bbox.xMax + cur->pos.x) - s_offset; if (cur->symbol == '\n') { break_type = 2; break_at = i; mp_msg(MSGT_ASS, MSGL_DBG2, "forced line break at %d\n", break_at); } if (len >= max_text_width) { break_type = 1; break_at = last_space; if (break_at == -1) break_at = i - 1; if (break_at == -1) break_at = 0; mp_msg(MSGT_ASS, MSGL_DBG2, "overfill at %d\n", i); mp_msg(MSGT_ASS, MSGL_DBG2, "line break at %d\n", break_at); } if (break_at != -1) { // need to use one more line // marking break_at+1 as start of a new line int lead = break_at + 1; // the first symbol of the new line if (text_info.n_lines >= MAX_LINES) { // to many lines ! // no more linebreaks for (j = lead; j < text_info.length; ++j) text_info.glyphs[j].linebreak = 0; break; } if (lead < text_info.length) text_info.glyphs[lead].linebreak = break_type; last_space = -1; s1 = text_info.glyphs + lead; s_offset = s1->bbox.xMin + s1->pos.x; text_info.n_lines ++; } if (cur->symbol == ' ') last_space = i; // make sure the hard linebreak is not forgotten when // there was a new soft linebreak just inserted if (cur->symbol == '\n' && break_type == 1) i--; } #define DIFF(x,y) (((x) < (y)) ? (y - x) : (x - y)) exit = 0; while (!exit) { exit = 1; w = s3 = text_info.glyphs; s1 = s2 = 0; for (i = 0; i <= text_info.length; ++i) { cur = text_info.glyphs + i; if ((i == text_info.length) || cur->linebreak) { s1 = s2; s2 = s3; s3 = cur; if (s1 && (s2->linebreak == 1)) { // have at least 2 lines, and linebreak is 'soft' int l1, l2, l1_new, l2_new; w = s2; do { --w; } while ((w > s1) && (w->symbol == ' ')); while ((w > s1) && (w->symbol != ' ')) { --w; } e1 = w; while ((e1 > s1) && (e1->symbol == ' ')) { --e1; } if (w->symbol == ' ') ++w; l1 = ((s2-1)->bbox.xMax + (s2-1)->pos.x) - (s1->bbox.xMin + s1->pos.x); l2 = ((s3-1)->bbox.xMax + (s3-1)->pos.x) - (s2->bbox.xMin + s2->pos.x); l1_new = (e1->bbox.xMax + e1->pos.x) - (s1->bbox.xMin + s1->pos.x); l2_new = ((s3-1)->bbox.xMax + (s3-1)->pos.x) - (w->bbox.xMin + w->pos.x); if (DIFF(l1_new, l2_new) < DIFF(l1, l2)) { w->linebreak = 1; s2->linebreak = 0; exit = 0; } } } if (i == text_info.length) break; } } assert(text_info.n_lines >= 1); #undef DIFF measure_text(); pen_shift_x = 0; pen_shift_y = 0; cur_line = 1; for (i = 0; i < text_info.length; ++i) { cur = text_info.glyphs + i; if (cur->linebreak) { int height = text_info.lines[cur_line - 1].desc + text_info.lines[cur_line].asc; cur_line ++; pen_shift_x = - cur->pos.x; pen_shift_y += d6_to_int(height + double_to_d6(global_settings->line_spacing)); 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); } cur->pos.x += pen_shift_x; cur->pos.y += pen_shift_y; } } /** * \brief determine karaoke effects * Karaoke effects cannot be calculated during parse stage (get_next_char()), * so they are done in a separate step. * Parse stage: when karaoke style override is found, its parameters are stored in the next glyph's * (the first glyph of the karaoke word)'s effect_type and effect_timing. * This function: * 1. sets effect_type for all glyphs in the word (_karaoke_ word) * 2. sets effect_timing for all glyphs to x coordinate of the border line between the left and right karaoke parts * (left part is filled with PrimaryColour, right one - with SecondaryColour). */ static void process_karaoke_effects(void) { glyph_info_t *cur, *cur2; glyph_info_t *s1, *e1; // start and end of the current word glyph_info_t *s2; // start of the next word int i; int timing; // current timing int tm_start, tm_end; // timings at start and end of the current word int tm_current; double dt; int x; int x_start, x_end; tm_current = frame_context.time - render_context.event->Start; timing = 0; s1 = s2 = 0; for (i = 0; i <= text_info.length; ++i) { cur = text_info.glyphs + i; if ((i == text_info.length) || (cur->effect_type != EF_NONE)) { s1 = s2; s2 = cur; if (s1) { e1 = s2 - 1; tm_start = timing + s1->effect_skip_timing; tm_end = tm_start + s1->effect_timing; timing = tm_end; x_start = 1000000; x_end = -1000000; for (cur2 = s1; cur2 <= e1; ++cur2) { x_start = FFMIN(x_start, cur2->bbox.xMin + cur2->pos.x); x_end = FFMAX(x_end, cur2->bbox.xMax + cur2->pos.x); } dt = (tm_current - tm_start); if ((s1->effect_type == EF_KARAOKE) || (s1->effect_type == EF_KARAOKE_KO)) { if (dt > 0) x = x_end + 1; else x = x_start; } else if (s1->effect_type == EF_KARAOKE_KF) { dt /= (tm_end - tm_start); x = x_start + (x_end - x_start) * dt; } else { mp_msg(MSGT_ASS, MSGL_ERR, MSGTR_LIBASS_UnknownEffectType_InternalError); continue; } for (cur2 = s1; cur2 <= e1; ++cur2) { cur2->effect_type = s1->effect_type; cur2->effect_timing = x - cur2->pos.x; } } } } } /** * \brief Calculate base point for positioning and rotation * \param bbox text bbox * \param alignment alignment * \param bx, by out: base point coordinates */ static void get_base_point(FT_BBox bbox, int alignment, int* bx, int* by) { const int halign = alignment & 3; const int valign = alignment & 12; if (bx) switch(halign) { case HALIGN_LEFT: *bx = bbox.xMin; break; case HALIGN_CENTER: *bx = (bbox.xMax + bbox.xMin) / 2; break; case HALIGN_RIGHT: *bx = bbox.xMax; break; } if (by) switch(valign) { case VALIGN_TOP: *by = bbox.yMin; break; case VALIGN_CENTER: *by = (bbox.yMax + bbox.yMin) / 2; break; case VALIGN_SUB: *by = bbox.yMax; break; } } /** * \brief Multiply 4-vector by 4-matrix * \param a 4-vector * \param m 4-matrix] * \param b out: 4-vector * Calculates a * m and stores result in b */ static inline void transform_point_3d(double *a, double *m, double *b) { b[0] = a[0] * m[0] + a[1] * m[4] + a[2] * m[8] + a[3] * m[12]; b[1] = a[0] * m[1] + a[1] * m[5] + a[2] * m[9] + a[3] * m[13]; b[2] = a[0] * m[2] + a[1] * m[6] + a[2] * m[10] + a[3] * m[14]; b[3] = a[0] * m[3] + a[1] * m[7] + a[2] * m[11] + a[3] * m[15]; } /** * \brief Apply 3d transformation to a vector * \param v FreeType vector (2d) * \param m 4-matrix * Transforms v by m, projects the result back to the screen plane * Result is returned in v. */ static inline void transform_vector_3d(FT_Vector* v, double *m) { const double camera = 2500 * frame_context.border_scale; // camera distance const double cutoff_z = 10.; double a[4], b[4]; a[0] = d6_to_double(v->x); a[1] = d6_to_double(v->y); a[2] = 0.; a[3] = 1.; transform_point_3d(a, m, b); /* Apply perspective projection with the following matrix: 2500 0 0 0 0 2500 0 0 0 0 0 0 0 0 8 2500 where 2500 is camera distance, 8 - z-axis scale. Camera is always located in (org_x, org_y, -2500). This means that different subtitle events can be displayed at the same time using different cameras. */ b[0] *= camera; b[1] *= camera; b[3] = 8 * b[2] + camera; if (b[3] < cutoff_z) b[3] = cutoff_z; v->x = double_to_d6(b[0] / b[3]); v->y = double_to_d6(b[1] / b[3]); } /** * \brief Apply 3d transformation to a glyph * \param glyph FreeType glyph * \param m 4-matrix * Transforms glyph by m, projects the result back to the screen plane * Result is returned in glyph. */ static inline void transform_glyph_3d(FT_Glyph glyph, double *m, FT_Vector shift) { int i; FT_Outline* outline = &((FT_OutlineGlyph)glyph)->outline; FT_Vector* p = outline->points; for (i=0; in_points; i++) { p[i].x += shift.x; p[i].y += shift.y; transform_vector_3d(p + i, m); p[i].x -= shift.x; p[i].y -= shift.y; } //transform_vector_3d(&glyph->advance, m); } /** * \brief Apply 3d transformation to several objects * \param shift FreeType vector * \param glyph FreeType glyph * \param glyph2 FreeType glyph * \param frx x-axis rotation angle * \param fry y-axis rotation angle * \param frz z-axis rotation angle * Rotates both glyphs by frx, fry and frz. Shift vector is added before rotation and subtracted after it. */ static void transform_3d(FT_Vector shift, FT_Glyph* glyph, FT_Glyph* glyph2, double frx, double fry, double frz) { fry = - fry; // FreeType's y axis goes in the opposite direction if (frx != 0. || fry != 0. || frz != 0.) { double m[16]; double sx = sin(frx); double sy = sin(fry); double sz = sin(frz); double cx = cos(frx); double cy = cos(fry); double cz = cos(frz); m[0] = cy * cz; m[1] = cy*sz; m[2] = -sy; m[3] = 0.0; m[4] = -cx*sz + sx*sy*cz; m[5] = cx*cz + sx*sy*sz; m[6] = sx*cy; m[7] = 0.0; m[8] = sx*sz + cx*sy*cz; m[9] = -sx*cz + cx*sy*sz; m[10] = cx*cy; m[11] = 0.0; m[12] = 0.0; m[13] = 0.0; m[14] = 0.0; m[15] = 1.0; if (glyph && *glyph) transform_glyph_3d(*glyph, m, shift); if (glyph2 && *glyph2) transform_glyph_3d(*glyph2, m, shift); } } /** * \brief Main ass rendering function, glues everything together * \param event event to render * Process event, appending resulting ass_image_t's to images_root. */ static int ass_render_event(ass_event_t* event, event_images_t* event_images) { char* p; FT_UInt previous; FT_UInt num_glyphs; FT_Vector pen; unsigned code; FT_BBox bbox; int i, j; FT_Vector shift; int MarginL, MarginR, MarginV; int last_break; int alignment, halign, valign; int device_x = 0, device_y = 0; if (event->Style >= frame_context.track->n_styles) { mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_NoStyleFound); return 1; } if (!event->Text) { mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_EmptyEvent); return 1; } init_render_context(event); text_info.length = 0; pen.x = 0; pen.y = 0; previous = 0; num_glyphs = 0; p = event->Text; // Event parsing. while (1) { // get next char, executing style override // this affects render_context do { code = get_next_char(&p); } while (code && render_context.drawing_mode); // skip everything in drawing mode // face could have been changed in get_next_char if (!render_context.font) { free_render_context(); return 1; } if (code == 0) break; if (text_info.length >= MAX_GLYPHS) { mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_MAX_GLYPHS_Reached, (int)(event - frame_context.track->events), event->Start, event->Duration, event->Text); break; } if ( previous && code ) { FT_Vector delta; delta = ass_font_get_kerning(render_context.font, previous, code); pen.x += delta.x * render_context.scale_x; pen.y += delta.y * render_context.scale_y; } shift.x = pen.x & 63; shift.y = pen.y & 63; ass_font_set_transform(render_context.font, render_context.scale_x * frame_context.font_scale_x, render_context.scale_y, &shift ); get_outline_glyph(code, text_info.glyphs + text_info.length, &shift); text_info.glyphs[text_info.length].pos.x = pen.x >> 6; text_info.glyphs[text_info.length].pos.y = pen.y >> 6; pen.x += text_info.glyphs[text_info.length].advance.x; pen.x += double_to_d6(render_context.hspacing); pen.y += text_info.glyphs[text_info.length].advance.y; previous = code; text_info.glyphs[text_info.length].symbol = code; text_info.glyphs[text_info.length].linebreak = 0; for (i = 0; i < 4; ++i) { uint32_t clr = render_context.c[i]; change_alpha(&clr, mult_alpha(_a(clr), render_context.fade), 1.); text_info.glyphs[text_info.length].c[i] = clr; } text_info.glyphs[text_info.length].effect_type = render_context.effect_type; text_info.glyphs[text_info.length].effect_timing = render_context.effect_timing; text_info.glyphs[text_info.length].effect_skip_timing = render_context.effect_skip_timing; text_info.glyphs[text_info.length].be = render_context.be; text_info.glyphs[text_info.length].shadow = render_context.shadow; text_info.glyphs[text_info.length].frx = render_context.frx; text_info.glyphs[text_info.length].fry = render_context.fry; text_info.glyphs[text_info.length].frz = render_context.frz; ass_font_get_asc_desc(render_context.font, code, &text_info.glyphs[text_info.length].asc, &text_info.glyphs[text_info.length].desc); text_info.glyphs[text_info.length].asc *= render_context.scale_y; text_info.glyphs[text_info.length].desc *= render_context.scale_y; // fill bitmap_hash_key text_info.glyphs[text_info.length].hash_key.font = render_context.font; text_info.glyphs[text_info.length].hash_key.size = render_context.font_size; text_info.glyphs[text_info.length].hash_key.outline = render_context.border * 0xFFFF; text_info.glyphs[text_info.length].hash_key.scale_x = render_context.scale_x * 0xFFFF; text_info.glyphs[text_info.length].hash_key.scale_y = render_context.scale_y * 0xFFFF; text_info.glyphs[text_info.length].hash_key.frx = render_context.frx * 0xFFFF; text_info.glyphs[text_info.length].hash_key.fry = render_context.fry * 0xFFFF; text_info.glyphs[text_info.length].hash_key.frz = render_context.frz * 0xFFFF; text_info.glyphs[text_info.length].hash_key.bold = render_context.bold; text_info.glyphs[text_info.length].hash_key.italic = render_context.italic; text_info.glyphs[text_info.length].hash_key.ch = code; text_info.glyphs[text_info.length].hash_key.advance = shift; text_info.glyphs[text_info.length].hash_key.be = render_context.be; text_info.length++; render_context.effect_type = EF_NONE; render_context.effect_timing = 0; render_context.effect_skip_timing = 0; } if (text_info.length == 0) { // no valid symbols in the event; this can be smth like {comment} free_render_context(); return 1; } // depends on glyph x coordinates being monotonous, so it should be done before line wrap process_karaoke_effects(); // alignments alignment = render_context.alignment; halign = alignment & 3; valign = alignment & 12; MarginL = (event->MarginL) ? event->MarginL : render_context.style->MarginL; MarginR = (event->MarginR) ? event->MarginR : render_context.style->MarginR; MarginV = (event->MarginV) ? event->MarginV : render_context.style->MarginV; if (render_context.evt_type != EVENT_HSCROLL) { int max_text_width; // calculate max length of a line max_text_width = x2scr(frame_context.track->PlayResX - MarginR) - x2scr(MarginL); // rearrange text in several lines wrap_lines_smart(max_text_width); // align text last_break = -1; for (i = 1; i < text_info.length + 1; ++i) { // (text_info.length + 1) is the end of the last line if ((i == text_info.length) || text_info.glyphs[i].linebreak) { int width, shift = 0; glyph_info_t* first_glyph = text_info.glyphs + last_break + 1; glyph_info_t* last_glyph = text_info.glyphs + i - 1; while ((last_glyph > first_glyph) && ((last_glyph->symbol == '\n') || (last_glyph->symbol == 0))) last_glyph --; width = last_glyph->pos.x + d6_to_int(last_glyph->advance.x) - first_glyph->pos.x; if (halign == HALIGN_LEFT) { // left aligned, no action shift = 0; } else if (halign == HALIGN_RIGHT) { // right aligned shift = max_text_width - width; } else if (halign == HALIGN_CENTER) { // centered shift = (max_text_width - width) / 2; } for (j = last_break + 1; j < i; ++j) { text_info.glyphs[j].pos.x += shift; } last_break = i - 1; } } } else { // render_context.evt_type == EVENT_HSCROLL measure_text(); } // determing text bounding box compute_string_bbox(&text_info, &bbox); // determine device coordinates for text // x coordinate for everything except positioned events if (render_context.evt_type == EVENT_NORMAL || render_context.evt_type == EVENT_VSCROLL) { device_x = x2scr(MarginL); } else if (render_context.evt_type == EVENT_HSCROLL) { if (render_context.scroll_direction == SCROLL_RL) device_x = x2scr(frame_context.track->PlayResX - render_context.scroll_shift); else if (render_context.scroll_direction == SCROLL_LR) device_x = x2scr(render_context.scroll_shift) - (bbox.xMax - bbox.xMin); } // y coordinate for everything except positioned events if (render_context.evt_type == EVENT_NORMAL || render_context.evt_type == EVENT_HSCROLL) { if (valign == VALIGN_TOP) { // toptitle device_y = y2scr_top(MarginV) + d6_to_int(text_info.lines[0].asc); } else if (valign == VALIGN_CENTER) { // midtitle int scr_y = y2scr(frame_context.track->PlayResY / 2); device_y = scr_y - (bbox.yMax - bbox.yMin) / 2; } else { // subtitle int scr_y; if (valign != VALIGN_SUB) mp_msg(MSGT_ASS, MSGL_V, "Invalid valign, supposing 0 (subtitle)\n"); scr_y = y2scr_sub(frame_context.track->PlayResY - MarginV); device_y = scr_y; device_y -= d6_to_int(text_info.height); device_y += d6_to_int(text_info.lines[0].asc); } } else if (render_context.evt_type == EVENT_VSCROLL) { if (render_context.scroll_direction == SCROLL_TB) device_y = y2scr(render_context.clip_y0 + render_context.scroll_shift) - (bbox.yMax - bbox.yMin); else if (render_context.scroll_direction == SCROLL_BT) device_y = y2scr(render_context.clip_y1 - render_context.scroll_shift); } // positioned events are totally different if (render_context.evt_type == EVENT_POSITIONED) { int base_x = 0; int base_y = 0; mp_msg(MSGT_ASS, MSGL_DBG2, "positioned event at %f, %f\n", render_context.pos_x, render_context.pos_y); get_base_point(bbox, alignment, &base_x, &base_y); device_x = x2scr(render_context.pos_x) - base_x; device_y = y2scr(render_context.pos_y) - base_y; } // fix clip coordinates (they depend on alignment) render_context.clip_x0 = x2scr(render_context.clip_x0); render_context.clip_x1 = x2scr(render_context.clip_x1); if (render_context.evt_type == EVENT_NORMAL || render_context.evt_type == EVENT_HSCROLL || render_context.evt_type == EVENT_VSCROLL) { if (valign == VALIGN_TOP) { render_context.clip_y0 = y2scr_top(render_context.clip_y0); render_context.clip_y1 = y2scr_top(render_context.clip_y1); } else if (valign == VALIGN_CENTER) { render_context.clip_y0 = y2scr(render_context.clip_y0); render_context.clip_y1 = y2scr(render_context.clip_y1); } else if (valign == VALIGN_SUB) { render_context.clip_y0 = y2scr_sub(render_context.clip_y0); render_context.clip_y1 = y2scr_sub(render_context.clip_y1); } } else if (render_context.evt_type == EVENT_POSITIONED) { render_context.clip_y0 = y2scr(render_context.clip_y0); render_context.clip_y1 = y2scr(render_context.clip_y1); } // calculate rotation parameters { FT_Vector center; if (render_context.have_origin) { center.x = x2scr(render_context.org_x); center.y = y2scr(render_context.org_y); } else { int bx, by; get_base_point(bbox, alignment, &bx, &by); center.x = device_x + bx; center.y = device_y + by; } for (i = 0; i < text_info.length; ++i) { glyph_info_t* info = text_info.glyphs + i; if (info->hash_key.frx || info->hash_key.fry || info->hash_key.frz) { info->hash_key.shift_x = info->pos.x + device_x - center.x; info->hash_key.shift_y = - (info->pos.y + device_y - center.y); } else { info->hash_key.shift_x = 0; info->hash_key.shift_y = 0; } } } // convert glyphs to bitmaps for (i = 0; i < text_info.length; ++i) get_bitmap_glyph(text_info.glyphs + i); event_images->top = device_y - d6_to_int(text_info.lines[0].asc); event_images->height = d6_to_int(text_info.height); event_images->detect_collisions = render_context.detect_collisions; event_images->shift_direction = (valign == VALIGN_TOP) ? 1 : -1; event_images->event = event; event_images->imgs = render_text(&text_info, device_x, device_y); free_render_context(); return 0; } /** * \brief deallocate image list * \param img list pointer */ void ass_free_images(ass_image_t* img) { while (img) { ass_image_t* next = img->next; free(img); img = next; } } static void ass_reconfigure(ass_renderer_t* priv) { priv->render_id = ++last_render_id; ass_glyph_cache_reset(); ass_bitmap_cache_reset(); ass_free_images(priv->prev_images_root); priv->prev_images_root = 0; } void ass_set_frame_size(ass_renderer_t* priv, int w, int h) { if (priv->settings.frame_width != w || priv->settings.frame_height != h) { priv->settings.frame_width = w; priv->settings.frame_height = h; if (priv->settings.aspect == 0.) priv->settings.aspect = ((double)w) / h; ass_reconfigure(priv); } } void ass_set_margins(ass_renderer_t* priv, int t, int b, int l, int r) { if (priv->settings.left_margin != l || priv->settings.right_margin != r || priv->settings.top_margin != t || priv->settings.bottom_margin != b) { priv->settings.left_margin = l; priv->settings.right_margin = r; priv->settings.top_margin = t; priv->settings.bottom_margin = b; ass_reconfigure(priv); } } void ass_set_use_margins(ass_renderer_t* priv, int use) { priv->settings.use_margins = use; } void ass_set_aspect_ratio(ass_renderer_t* priv, double ar) { if (priv->settings.aspect != ar) { priv->settings.aspect = ar; ass_reconfigure(priv); } } void ass_set_font_scale(ass_renderer_t* priv, double font_scale) { if (priv->settings.font_size_coeff != font_scale) { priv->settings.font_size_coeff = font_scale; ass_reconfigure(priv); } } void ass_set_hinting(ass_renderer_t* priv, ass_hinting_t ht) { if (priv->settings.hinting != ht) { priv->settings.hinting = ht; ass_reconfigure(priv); } } void ass_set_line_spacing(ass_renderer_t* priv, double line_spacing) { priv->settings.line_spacing = line_spacing; } static int ass_set_fonts_(ass_renderer_t* priv, const char* default_font, const char* default_family, int fc) { if (priv->settings.default_font) free(priv->settings.default_font); if (priv->settings.default_family) free(priv->settings.default_family); priv->settings.default_font = default_font ? strdup(default_font) : 0; priv->settings.default_family = default_family ? strdup(default_family) : 0; if (priv->fontconfig_priv) fontconfig_done(priv->fontconfig_priv); priv->fontconfig_priv = fontconfig_init(priv->library, priv->ftlibrary, default_family, default_font, fc); return !!priv->fontconfig_priv; } int ass_set_fonts(ass_renderer_t* priv, const char* default_font, const char* default_family) { return ass_set_fonts_(priv, default_font, default_family, 1); } int ass_set_fonts_nofc(ass_renderer_t* priv, const char* default_font, const char* default_family) { return ass_set_fonts_(priv, default_font, default_family, 0); } /** * \brief Start a new frame */ static int ass_start_frame(ass_renderer_t *priv, ass_track_t* track, long long now) { ass_renderer = priv; global_settings = &priv->settings; if (!priv->settings.frame_width && !priv->settings.frame_height) return 1; // library not initialized if (track->n_events == 0) return 1; // nothing to do frame_context.ass_priv = priv; frame_context.width = global_settings->frame_width; frame_context.height = global_settings->frame_height; frame_context.orig_width = global_settings->frame_width - global_settings->left_margin - global_settings->right_margin; frame_context.orig_height = global_settings->frame_height - global_settings->top_margin - global_settings->bottom_margin; frame_context.orig_width_nocrop = global_settings->frame_width - FFMAX(global_settings->left_margin, 0) - FFMAX(global_settings->right_margin, 0); frame_context.orig_height_nocrop = global_settings->frame_height - FFMAX(global_settings->top_margin, 0) - FFMAX(global_settings->bottom_margin, 0); frame_context.track = track; frame_context.time = now; ass_lazy_track_init(); frame_context.font_scale = global_settings->font_size_coeff * frame_context.orig_height / frame_context.track->PlayResY; frame_context.border_scale = ((double)frame_context.orig_height) / frame_context.track->PlayResY; if (frame_context.orig_width * track->PlayResY == frame_context.orig_height * track->PlayResX) frame_context.font_scale_x = 1.; else frame_context.font_scale_x = ((double)(frame_context.orig_width * track->PlayResY)) / (frame_context.orig_height * track->PlayResX); priv->prev_images_root = priv->images_root; priv->images_root = 0; return 0; } static int cmp_event_layer(const void* p1, const void* p2) { ass_event_t* e1 = ((event_images_t*)p1)->event; ass_event_t* e2 = ((event_images_t*)p2)->event; if (e1->Layer < e2->Layer) return -1; if (e1->Layer > e2->Layer) return 1; if (e1->ReadOrder < e2->ReadOrder) return -1; if (e1->ReadOrder > e2->ReadOrder) return 1; return 0; } #define MAX_EVENTS 100 static render_priv_t* get_render_priv(ass_event_t* event) { if (!event->render_priv) event->render_priv = calloc(1, sizeof(render_priv_t)); // FIXME: check render_id if (ass_renderer->render_id != event->render_priv->render_id) { memset(event->render_priv, 0, sizeof(render_priv_t)); event->render_priv->render_id = ass_renderer->render_id; } return event->render_priv; } typedef struct segment_s { int a, b; // top and height } segment_t; static int overlap(segment_t* s1, segment_t* s2) { if (s1->a >= s2->b || s2->a >= s1->b) return 0; return 1; } static int cmp_segment(const void* p1, const void* p2) { return ((segment_t*)p1)->a - ((segment_t*)p2)->a; } static void shift_event(event_images_t* ei, int shift) { ass_image_t* cur = ei->imgs; while (cur) { cur->dst_y += shift; // clip top and bottom if (cur->dst_y < 0) { int clip = - cur->dst_y; cur->h -= clip; cur->bitmap += clip * cur->stride; cur->dst_y = 0; } if (cur->dst_y + cur->h >= frame_context.height) { int clip = cur->dst_y + cur->h - frame_context.height; cur->h -= clip; } if (cur->h <= 0) { cur->h = 0; cur->dst_y = 0; } cur = cur->next; } ei->top += shift; } // dir: 1 - move down // -1 - move up static int fit_segment(segment_t* s, segment_t* fixed, int* cnt, int dir) { int i; int shift = 0; if (dir == 1) // move down for (i = 0; i < *cnt; ++i) { if (s->b + shift <= fixed[i].a || s->a + shift >= fixed[i].b) continue; shift = fixed[i].b - s->a; } else // dir == -1, move up for (i = *cnt-1; i >= 0; --i) { if (s->b + shift <= fixed[i].a || s->a + shift >= fixed[i].b) continue; shift = fixed[i].a - s->b; } fixed[*cnt].a = s->a + shift; fixed[*cnt].b = s->b + shift; (*cnt)++; qsort(fixed, *cnt, sizeof(segment_t), cmp_segment); return shift; } static void fix_collisions(event_images_t* imgs, int cnt) { segment_t used[MAX_EVENTS]; int cnt_used = 0; int i, j; // fill used[] with fixed events for (i = 0; i < cnt; ++i) { render_priv_t* priv; if (!imgs[i].detect_collisions) continue; priv = get_render_priv(imgs[i].event); if (priv->height > 0) { // it's a fixed event segment_t s; s.a = priv->top; s.b = priv->top + priv->height; if (priv->height != imgs[i].height) { // no, it's not mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_EventHeightHasChanged); priv->top = 0; priv->height = 0; } for (j = 0; j < cnt_used; ++j) if (overlap(&s, used + j)) { // no, it's not priv->top = 0; priv->height = 0; } if (priv->height > 0) { // still a fixed event used[cnt_used].a = priv->top; used[cnt_used].b = priv->top + priv->height; cnt_used ++; shift_event(imgs + i, priv->top - imgs[i].top); } } } qsort(used, cnt_used, sizeof(segment_t), cmp_segment); // try to fit other events in free spaces for (i = 0; i < cnt; ++i) { render_priv_t* priv; if (!imgs[i].detect_collisions) continue; priv = get_render_priv(imgs[i].event); if (priv->height == 0) { // not a fixed event int shift; segment_t s; s.a = imgs[i].top; s.b = imgs[i].top + imgs[i].height; shift = fit_segment(&s, used, &cnt_used, imgs[i].shift_direction); if (shift) shift_event(imgs + i, shift); // make it fixed priv->top = imgs[i].top; priv->height = imgs[i].height; } } } /** * \brief compare two images * \param i1 first image * \param i2 second image * \return 0 if identical, 1 if different positions, 2 if different content */ int ass_image_compare(ass_image_t *i1, ass_image_t *i2) { if (i1->w != i2->w) return 2; if (i1->h != i2->h) return 2; if (i1->stride != i2->stride) return 2; if (i1->color != i2->color) return 2; if (i1->bitmap != i2->bitmap) return 2; if (i1->dst_x != i2->dst_x) return 1; if (i1->dst_y != i2->dst_y) return 1; return 0; } /** * \brief compare current and previous image list * \param priv library handle * \return 0 if identical, 1 if different positions, 2 if different content */ int ass_detect_change(ass_renderer_t *priv) { ass_image_t* img, *img2; int diff; img = priv->prev_images_root; img2 = priv->images_root; diff = 0; while (img && diff < 2) { ass_image_t* next, *next2; next = img->next; if (img2) { int d = ass_image_compare(img, img2); if (d > diff) diff = d; next2 = img2->next; } else { // previous list is shorter diff = 2; break; } img = next; img2 = next2; } // is the previous list longer? if (img2) diff = 2; return diff; } /** * \brief render a frame * \param priv library handle * \param track track * \param now current video timestamp (ms) * \param detect_change a value describing how the new images differ from the previous ones will be written here: * 0 if identical, 1 if different positions, 2 if different content. * Can be NULL, in that case no detection is performed. */ ass_image_t* ass_render_frame(ass_renderer_t *priv, ass_track_t* track, long long now, int* detect_change) { int i, cnt, rc; event_images_t* last; ass_image_t** tail; // init frame rc = ass_start_frame(priv, track, now); if (rc != 0) return 0; // render events separately cnt = 0; for (i = 0; i < track->n_events; ++i) { ass_event_t* event = track->events + i; if ( (event->Start <= now) && (now < (event->Start + event->Duration)) ) { if (cnt >= priv->eimg_size) { priv->eimg_size += 100; priv->eimg = realloc(priv->eimg, priv->eimg_size * sizeof(event_images_t)); } rc = ass_render_event(event, priv->eimg + cnt); if (!rc) ++cnt; } } // sort by layer qsort(priv->eimg, cnt, sizeof(event_images_t), cmp_event_layer); // call fix_collisions for each group of events with the same layer last = priv->eimg; for (i = 1; i < cnt; ++i) if (last->event->Layer != priv->eimg[i].event->Layer) { fix_collisions(last, priv->eimg + i - last); last = priv->eimg + i; } if (cnt > 0) fix_collisions(last, priv->eimg + cnt - last); // concat lists tail = &ass_renderer->images_root; for (i = 0; i < cnt; ++i) { ass_image_t* cur = priv->eimg[i].imgs; while (cur) { *tail = cur; tail = &cur->next; cur = cur->next; } } if (detect_change) *detect_change = ass_detect_change(priv); // free the previous image list ass_free_images(priv->prev_images_root); priv->prev_images_root = 0; return ass_renderer->images_root; }