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349 lines
13 KiB
349 lines
13 KiB
/*****************************************************************************
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* subsdec.c : text subtitle decoder
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*****************************************************************************
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* Copyright © 2011-2015 VLC authors and VideoLAN
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*
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* Authors: Laurent Aimer <fenrir@videolan.org>
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* Jean-Baptiste Kempf <jb@videolan.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#include <vlc_strings.h>
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#include <vlc_text_style.h>
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#include <vlc_subpicture.h>
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typedef struct substext_updater_region_t substext_updater_region_t;
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enum substext_updater_region_flags_e
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{
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UPDT_REGION_ORIGIN_X_IS_RATIO = 1 << 0,
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UPDT_REGION_ORIGIN_Y_IS_RATIO = 1 << 1,
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UPDT_REGION_EXTENT_X_IS_RATIO = 1 << 2,
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UPDT_REGION_EXTENT_Y_IS_RATIO = 1 << 3,
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UPDT_REGION_IGNORE_BACKGROUND = 1 << 4,
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UPDT_REGION_USES_GRID_COORDINATES = 1 << 5,
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UPDT_REGION_FIXED_DONE = 1 << 31,
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};
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struct substext_updater_region_t
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{
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struct
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{
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float x;
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float y;
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} origin, extent;
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/* store above percentile meanings as modifier flags */
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int flags; /* subpicture_updater_sys_region_flags_e */
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int align; /* alignment of the region itself */
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bool b_absolute; /**< position is absolute in the movie */
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bool b_in_window; /**< position the region in whole window */
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int inner_align; /* alignment of content inside the region */
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text_style_t *p_region_style;
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text_segment_t *p_segments;
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substext_updater_region_t *p_next;
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};
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typedef struct
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{
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/* a min of one region */
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substext_updater_region_t region;
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/* styling */
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text_style_t *p_default_style; /* decoder (full or partial) defaults */
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float margin_ratio;
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vlc_tick_t i_next_update;
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bool b_blink_even;
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} subtext_updater_sys_t;
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static inline void SubpictureUpdaterSysRegionClean(substext_updater_region_t *p_updtregion)
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{
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text_segment_ChainDelete( p_updtregion->p_segments );
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text_style_Delete( p_updtregion->p_region_style );
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}
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static inline void SubpictureUpdaterSysRegionInit(substext_updater_region_t *p_updtregion)
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{
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memset(p_updtregion, 0, sizeof(*p_updtregion));
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p_updtregion->align = SUBPICTURE_ALIGN_BOTTOM;
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p_updtregion->b_absolute = false;
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p_updtregion->b_in_window = false;
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p_updtregion->inner_align = 0 ; // centered
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}
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static inline substext_updater_region_t *SubpictureUpdaterSysRegionNew( void )
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{
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substext_updater_region_t *p_region = malloc(sizeof(*p_region));
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if(p_region)
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SubpictureUpdaterSysRegionInit(p_region);
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return p_region;
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}
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static inline void SubpictureUpdaterSysRegionAdd(substext_updater_region_t *p_prev,
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substext_updater_region_t *p_new)
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{
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substext_updater_region_t **pp_next = &p_prev->p_next;
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for(; *pp_next; pp_next = &(*pp_next)->p_next);
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*pp_next = p_new;
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}
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static void SubpictureTextUpdate(subpicture_t *subpic,
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const struct vlc_spu_updater_configuration *cfg)
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{
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subtext_updater_sys_t *sys = subpic->updater.sys;
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const video_format_t *fmt_src = cfg->video_src;
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const video_format_t *fmt_dst = cfg->video_dst;
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if (fmt_src->i_visible_height == cfg->prev_src->i_visible_height &&
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video_format_IsSimilar(cfg->prev_dst, fmt_dst) &&
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(sys->i_next_update == VLC_TICK_INVALID || sys->i_next_update > cfg->pts))
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return;
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substext_updater_region_t *p_updtregion = &sys->region;
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if (!(p_updtregion->flags & UPDT_REGION_FIXED_DONE) &&
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p_updtregion->b_absolute && !vlc_spu_regions_is_empty(&subpic->regions) &&
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subpic->i_original_picture_width > 0 &&
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subpic->i_original_picture_height > 0)
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{
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subpicture_region_t *p_region =
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vlc_spu_regions_first_or_null(&subpic->regions);
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p_updtregion->flags |= UPDT_REGION_FIXED_DONE;
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p_updtregion->origin.x = p_region->i_x;
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p_updtregion->origin.y = p_region->i_y;
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p_updtregion->extent.x = subpic->i_original_picture_width;
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p_updtregion->extent.y = subpic->i_original_picture_height;
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p_updtregion->flags &= ~(UPDT_REGION_ORIGIN_X_IS_RATIO|UPDT_REGION_ORIGIN_Y_IS_RATIO|
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UPDT_REGION_EXTENT_X_IS_RATIO|UPDT_REGION_EXTENT_Y_IS_RATIO);
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}
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vlc_spu_regions_Clear( &subpic->regions );
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assert(fmt_dst->i_sar_num && fmt_dst->i_sar_den);
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vlc_rational_t sar;
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/* NOTE about fmt_dst:
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* fmt_dst area and A/R will change to display once WxH of the
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* display is greater than the source video in direct rendering.
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* This will cause weird sudded region "moves" or "linebreaks" when
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* resizing window, mostly vertically.
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* see changes by 4a49754d943560fe79bc42f107d8ce566ea24898 */
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if( sys->region.flags & UPDT_REGION_USES_GRID_COORDINATES )
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{
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sar.num = 4;
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sar.den = 3;
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}
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else
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{
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sar.num = 1;
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sar.den = 1;
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}
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if ( p_updtregion->b_in_window )
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{
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subpic->i_original_picture_width = cfg->display_width;
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subpic->i_original_picture_height = cfg->display_height;
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}
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else if( sys->region.flags & UPDT_REGION_USES_GRID_COORDINATES )
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{
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subpic->i_original_picture_width = fmt_dst->i_visible_height * sar.num / sar.den;
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subpic->i_original_picture_height = fmt_dst->i_visible_height;
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}
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else
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{
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subpic->i_original_picture_width = fmt_dst->i_width * fmt_dst->i_sar_num / fmt_dst->i_sar_den;
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subpic->i_original_picture_height = fmt_dst->i_height;
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}
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bool b_schedule_blink_update = false;
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video_format_t render_fmt = *fmt_dst;
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if (p_updtregion->b_in_window)
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{
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render_fmt.i_x_offset = render_fmt.i_y_offset = 0;
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render_fmt.i_width = render_fmt.i_visible_width = cfg->display_width;
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render_fmt.i_height = render_fmt.i_visible_height = cfg->display_height;
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}
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for( substext_updater_region_t *update_region = &sys->region;
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update_region; update_region = update_region->p_next )
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{
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subpicture_region_t *r = subpicture_region_NewText();
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if (!r)
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return;
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vlc_spu_regions_push(&subpic->regions, r);
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r->fmt.i_sar_num = sar.num;
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r->fmt.i_sar_den = sar.den;
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r->p_text = text_segment_Copy( update_region->p_segments );
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r->b_absolute = update_region->b_absolute;
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r->b_in_window = update_region->b_in_window;
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r->i_align = update_region->align;
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r->text_flags |= update_region->inner_align & SUBPICTURE_ALIGN_MASK;
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if (update_region->flags & UPDT_REGION_IGNORE_BACKGROUND)
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r->text_flags |= VLC_SUBPIC_TEXT_FLAG_NO_REGION_BG;
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bool b_gridmode = (update_region->flags & UPDT_REGION_USES_GRID_COORDINATES) != 0;
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if (b_gridmode)
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r->text_flags |= VLC_SUBPIC_TEXT_FLAG_GRID_MODE;
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if (!(update_region->flags & UPDT_REGION_FIXED_DONE))
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{
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const float margin_ratio = sys->margin_ratio;
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const int margin_h = margin_ratio * ( b_gridmode ? subpic->i_original_picture_width
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: render_fmt.i_visible_width );
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const int margin_v = margin_ratio * render_fmt.i_visible_height;
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/* subpic invisible margins sizes */
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const int outerright_h = render_fmt.i_width - (render_fmt.i_visible_width + render_fmt.i_x_offset);
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const int outerbottom_v = render_fmt.i_height - (render_fmt.i_visible_height + render_fmt.i_y_offset);
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/* regions usable */
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const int inner_w = render_fmt.i_visible_width - margin_h * 2;
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const int inner_h = render_fmt.i_visible_height - margin_v * 2;
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if (r->i_align & SUBPICTURE_ALIGN_LEFT)
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r->i_x = margin_h + render_fmt.i_x_offset;
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else if (r->i_align & SUBPICTURE_ALIGN_RIGHT)
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r->i_x = margin_h + outerright_h;
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else
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r->i_x = 0;
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if (r->i_align & SUBPICTURE_ALIGN_TOP )
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r->i_y = margin_v + render_fmt.i_y_offset;
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else if (r->i_align & SUBPICTURE_ALIGN_BOTTOM )
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r->i_y = margin_v + outerbottom_v;
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else
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r->i_y = 0;
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if( update_region->flags & UPDT_REGION_ORIGIN_X_IS_RATIO )
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r->i_x += update_region->origin.x * inner_w;
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else
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r->i_x += update_region->origin.x;
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if( update_region->flags & UPDT_REGION_ORIGIN_Y_IS_RATIO )
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r->i_y += update_region->origin.y * inner_h;
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else
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r->i_y += update_region->origin.y;
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if( update_region->flags & UPDT_REGION_EXTENT_X_IS_RATIO )
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r->i_max_width += update_region->extent.x * inner_w;
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else
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r->i_max_width += update_region->extent.x;
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if( update_region->flags & UPDT_REGION_EXTENT_Y_IS_RATIO )
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r->i_max_height += update_region->extent.y * inner_h;
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else
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r->i_max_height += update_region->extent.y;
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} else {
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/* FIXME it doesn't adapt on crop settings changes */
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r->i_x = update_region->origin.x * render_fmt.i_width / update_region->extent.x;
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r->i_y = update_region->origin.y * render_fmt.i_height / update_region->extent.y;
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}
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/* Add missing default style, if any, to all segments */
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for ( text_segment_t* p_segment = r->p_text; p_segment; p_segment = p_segment->p_next )
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{
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/* Add decoder defaults */
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if( p_segment->style )
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text_style_Merge( p_segment->style, sys->p_default_style, false );
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else
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p_segment->style = text_style_Duplicate( sys->p_default_style );
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if( p_segment->style )
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{
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/* Update all segments font sizes in video source %,
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* so we can handle HiDPI properly and have consistent rendering limits */
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if( p_segment->style->i_font_size > 0 && fmt_src->i_visible_height > 0 )
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{
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p_segment->style->f_font_relsize = 100.0 * p_segment->style->i_font_size / fmt_src->i_visible_height;
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p_segment->style->i_font_size = 0;
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}
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if( p_segment->style->i_style_flags & (STYLE_BLINK_BACKGROUND|STYLE_BLINK_FOREGROUND) )
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{
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if( sys->b_blink_even ) /* do nothing at first */
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{
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if( p_segment->style->i_style_flags & STYLE_BLINK_BACKGROUND )
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p_segment->style->i_background_alpha =
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(~p_segment->style->i_background_alpha) & 0xFF;
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if( p_segment->style->i_style_flags & STYLE_BLINK_FOREGROUND )
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p_segment->style->i_font_alpha =
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(~p_segment->style->i_font_alpha) & 0xFF;
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}
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b_schedule_blink_update = true;
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}
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}
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}
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}
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if( b_schedule_blink_update &&
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(sys->i_next_update == VLC_TICK_INVALID || sys->i_next_update < cfg->pts) )
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{
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sys->i_next_update = cfg->pts + VLC_TICK_FROM_SEC(1);
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sys->b_blink_even = !sys->b_blink_even;
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}
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}
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static void SubpictureTextDestroy(subpicture_t *subpic)
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{
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subtext_updater_sys_t *sys = subpic->updater.sys;
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SubpictureUpdaterSysRegionClean( &sys->region );
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substext_updater_region_t *p_region = sys->region.p_next;
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while( p_region )
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{
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substext_updater_region_t *p_next = p_region->p_next;
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SubpictureUpdaterSysRegionClean( p_region );
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free( p_region );
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p_region = p_next;
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}
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text_style_Delete( sys->p_default_style );
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free(sys);
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}
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static inline subpicture_t *decoder_NewSubpictureText(decoder_t *decoder)
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{
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subtext_updater_sys_t *sys = calloc(1, sizeof(*sys));
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static const struct vlc_spu_updater_ops spu_ops =
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{
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.update = SubpictureTextUpdate,
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.destroy = SubpictureTextDestroy,
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};
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subpicture_updater_t updater = {
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.sys = sys,
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.ops = &spu_ops,
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};
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SubpictureUpdaterSysRegionInit( &sys->region );
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sys->margin_ratio = 0.04f;
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sys->p_default_style = text_style_Create( STYLE_NO_DEFAULTS );
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if(unlikely(!sys->p_default_style))
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{
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free(sys);
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return NULL;
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}
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subpicture_t *subpic = decoder_NewSubpicture(decoder, &updater);
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if (!subpic)
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{
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text_style_Delete(sys->p_default_style);
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free(sys);
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return NULL;
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}
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sys->region.b_absolute = true; sys->region.b_in_window = false;
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sys->i_next_update = VLC_TICK_INVALID;
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return subpic;
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}
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