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316 lines
12 KiB
316 lines
12 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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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->inner_align = 0;
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}
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static inline substext_updater_region_t *SubpictureUpdaterSysRegionNew( )
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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 int SubpictureTextValidate(subpicture_t *subpic,
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bool has_src_changed, const video_format_t *fmt_src,
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bool has_dst_changed, const video_format_t *fmt_dst,
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vlc_tick_t ts)
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{
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subtext_updater_sys_t *sys = subpic->updater.p_sys;
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VLC_UNUSED(fmt_src); VLC_UNUSED(fmt_dst);
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if (!has_src_changed && !has_dst_changed &&
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(sys->i_next_update == VLC_TICK_INVALID || sys->i_next_update > ts))
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return VLC_SUCCESS;
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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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subpic->b_absolute && subpic->p_region &&
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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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p_updtregion->flags |= UPDT_REGION_FIXED_DONE;
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p_updtregion->origin.x = subpic->p_region->i_x;
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p_updtregion->origin.y = subpic->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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return VLC_EGENERIC;
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}
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static void SubpictureTextUpdate(subpicture_t *subpic,
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const video_format_t *fmt_src,
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const video_format_t *fmt_dst,
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vlc_tick_t ts)
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{
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subtext_updater_sys_t *sys = subpic->updater.p_sys;
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VLC_UNUSED(fmt_src);
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if (fmt_dst->i_sar_num <= 0 || fmt_dst->i_sar_den <= 0)
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return;
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video_format_t fmt;
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video_format_Init(&fmt, VLC_CODEC_TEXT);
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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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fmt.i_sar_num = 4;
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fmt.i_sar_den = 3;
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subpic->i_original_picture_width = fmt_dst->i_visible_height * fmt.i_sar_num / fmt.i_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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fmt.i_sar_num = 1;
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fmt.i_sar_den = 1;
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}
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bool b_schedule_blink_update = false;
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subpicture_region_t **pp_last_region = &subpic->p_region;
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for( substext_updater_region_t *p_updtregion = &sys->region;
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p_updtregion; p_updtregion = p_updtregion->p_next )
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{
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subpicture_region_t *r = *pp_last_region = subpicture_region_New(&fmt);
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if (!r)
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return;
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pp_last_region = &r->p_next;
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r->p_text = text_segment_Copy( p_updtregion->p_segments );
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r->i_align = p_updtregion->align;
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r->i_text_align = p_updtregion->inner_align;
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r->b_noregionbg = p_updtregion->flags & UPDT_REGION_IGNORE_BACKGROUND;
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r->b_gridmode = p_updtregion->flags & UPDT_REGION_USES_GRID_COORDINATES;
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if (!(p_updtregion->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 * (( r->b_gridmode ) ? (unsigned) subpic->i_original_picture_width
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: fmt_dst->i_visible_width );
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const int margin_v = margin_ratio * fmt_dst->i_visible_height;
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/* subpic invisible margins sizes */
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const int outerright_h = fmt_dst->i_width - (fmt_dst->i_visible_width + fmt_dst->i_x_offset);
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const int outerbottom_v = fmt_dst->i_height - (fmt_dst->i_visible_height + fmt_dst->i_y_offset);
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/* regions usable */
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const int inner_w = fmt_dst->i_visible_width - margin_h * 2;
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const int inner_h = fmt_dst->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 + fmt_dst->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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if (r->i_align & SUBPICTURE_ALIGN_TOP )
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r->i_y = margin_v + fmt_dst->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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if( p_updtregion->flags & UPDT_REGION_ORIGIN_X_IS_RATIO )
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r->i_x += p_updtregion->origin.x * inner_w;
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else
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r->i_x += p_updtregion->origin.x;
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if( p_updtregion->flags & UPDT_REGION_ORIGIN_Y_IS_RATIO )
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r->i_y += p_updtregion->origin.y * inner_h;
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else
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r->i_y += p_updtregion->origin.y;
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if( p_updtregion->flags & UPDT_REGION_EXTENT_X_IS_RATIO )
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r->i_max_width += p_updtregion->extent.x * inner_w;
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else
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r->i_max_width += p_updtregion->extent.x;
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if( p_updtregion->flags & UPDT_REGION_EXTENT_Y_IS_RATIO )
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r->i_max_height += p_updtregion->extent.y * inner_h;
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else
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r->i_max_height += p_updtregion->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 = p_updtregion->origin.x * fmt_dst->i_width / p_updtregion->extent.x;
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r->i_y = p_updtregion->origin.y * fmt_dst->i_height / p_updtregion->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 < ts) )
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{
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sys->i_next_update = ts + 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.p_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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subpicture_updater_t updater = {
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.pf_validate = SubpictureTextValidate,
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.pf_update = SubpictureTextUpdate,
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.pf_destroy = SubpictureTextDestroy,
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.p_sys = sys,
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};
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SubpictureUpdaterSysRegionInit( &sys->region );
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sys->margin_ratio = 0.04;
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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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}
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return subpic;
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}
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