1 /*****************************************************************************
2 * transform.c : transform image module for vlc
3 *****************************************************************************
4 * Copyright (C) 2000-2006 the VideoLAN team
7 * Authors: Samuel Hocevar <sam@zoy.org>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
32 #include <vlc_common.h>
33 #include <vlc_plugin.h>
36 #include "filter_common.h"
37 #include "filter_picture.h"
39 #define TRANSFORM_MODE_HFLIP 1
40 #define TRANSFORM_MODE_VFLIP 2
41 #define TRANSFORM_MODE_90 3
42 #define TRANSFORM_MODE_180 4
43 #define TRANSFORM_MODE_270 5
45 /*****************************************************************************
47 *****************************************************************************/
48 static int Create ( vlc_object_t * );
49 static void Destroy ( vlc_object_t * );
51 static int Init ( vout_thread_t * );
52 static void End ( vout_thread_t * );
53 static void Render ( vout_thread_t *, picture_t * );
55 static void FilterPlanar( vout_thread_t *, const picture_t *, picture_t * );
56 static void FilterI422( vout_thread_t *, const picture_t *, picture_t * );
57 static void FilterYUYV( vout_thread_t *, const picture_t *, picture_t * );
59 static int MouseEvent( vlc_object_t *, char const *,
60 vlc_value_t, vlc_value_t, void * );
62 /*****************************************************************************
64 *****************************************************************************/
65 #define TYPE_TEXT N_("Transform type")
66 #define TYPE_LONGTEXT N_("One of '90', '180', '270', 'hflip' and 'vflip'")
68 static const char *const type_list[] = { "90", "180", "270", "hflip", "vflip" };
69 static const char *const type_list_text[] = { N_("Rotate by 90 degrees"),
70 N_("Rotate by 180 degrees"), N_("Rotate by 270 degrees"),
71 N_("Flip horizontally"), N_("Flip vertically") };
73 #define TRANSFORM_HELP N_("Rotate or flip the video")
74 #define CFG_PREFIX "transform-"
77 set_description( N_("Video transformation filter") )
78 set_shortname( N_("Transformation"))
79 set_help(TRANSFORM_HELP)
80 set_capability( "video filter", 0 )
81 set_category( CAT_VIDEO )
82 set_subcategory( SUBCAT_VIDEO_VFILTER )
84 add_string( CFG_PREFIX "type", "90", NULL,
85 TYPE_TEXT, TYPE_LONGTEXT, false)
86 change_string_list( type_list, type_list_text, 0)
88 add_shortcut( "transform" )
89 set_callbacks( Create, Destroy )
92 static const char *const ppsz_filter_options[] = {
96 /*****************************************************************************
97 * vout_sys_t: Transform video output method descriptor
98 *****************************************************************************
99 * This structure is part of the video output thread descriptor.
100 * It describes the Transform specific properties of an output thread.
101 *****************************************************************************/
106 vout_thread_t *p_vout;
108 void (*pf_filter)( vout_thread_t *, const picture_t *, picture_t * );
111 /*****************************************************************************
112 * Control: control facility for the vout (forwards to child vout)
113 *****************************************************************************/
114 static int Control( vout_thread_t *p_vout, int i_query, va_list args )
116 return vout_vaControl( p_vout->p_sys->p_vout, i_query, args );
119 /*****************************************************************************
120 * Create: allocates Transform video thread output method
121 *****************************************************************************
122 * This function allocates and initializes a Transform vout method.
123 *****************************************************************************/
124 static int Create( vlc_object_t *p_this )
126 vout_thread_t *p_vout = (vout_thread_t *)p_this;
129 /* Allocate structure */
130 p_vout->p_sys = malloc( sizeof( vout_sys_t ) );
131 if( p_vout->p_sys == NULL )
134 p_vout->pf_init = Init;
135 p_vout->pf_end = End;
136 p_vout->pf_manage = NULL;
137 p_vout->pf_render = Render;
138 p_vout->pf_display = NULL;
139 p_vout->pf_control = Control;
141 config_ChainParse( p_vout, CFG_PREFIX, ppsz_filter_options,
144 /* Look what method was requested */
145 psz_method = var_CreateGetNonEmptyStringCommand( p_vout, "transform-type" );
147 switch( p_vout->fmt_in.i_chroma )
149 CASE_PLANAR_YUV_SQUARE
151 p_vout->p_sys->pf_filter = FilterPlanar;
156 p_vout->p_sys->pf_filter = FilterI422;
160 p_vout->p_sys->pf_filter = FilterYUYV;
164 msg_Err( p_vout, "Unsupported chroma" );
165 free( p_vout->p_sys );
169 if( psz_method == NULL )
171 msg_Err( p_vout, "configuration variable %s empty", "transform-type" );
172 msg_Err( p_vout, "no valid transform mode provided, using '90'" );
173 p_vout->p_sys->i_mode = TRANSFORM_MODE_90;
174 p_vout->p_sys->b_rotation = 1;
178 if( !strcmp( psz_method, "hflip" ) )
180 p_vout->p_sys->i_mode = TRANSFORM_MODE_HFLIP;
181 p_vout->p_sys->b_rotation = 0;
183 else if( !strcmp( psz_method, "vflip" ) )
185 p_vout->p_sys->i_mode = TRANSFORM_MODE_VFLIP;
186 p_vout->p_sys->b_rotation = 0;
188 else if( !strcmp( psz_method, "90" ) )
190 p_vout->p_sys->i_mode = TRANSFORM_MODE_90;
191 p_vout->p_sys->b_rotation = 1;
193 else if( !strcmp( psz_method, "180" ) )
195 p_vout->p_sys->i_mode = TRANSFORM_MODE_180;
196 p_vout->p_sys->b_rotation = 0;
198 else if( !strcmp( psz_method, "270" ) )
200 p_vout->p_sys->i_mode = TRANSFORM_MODE_270;
201 p_vout->p_sys->b_rotation = 1;
205 msg_Err( p_vout, "no valid transform mode provided, using '90'" );
206 p_vout->p_sys->i_mode = TRANSFORM_MODE_90;
207 p_vout->p_sys->b_rotation = 1;
216 /*****************************************************************************
217 * Init: initialize Transform video thread output method
218 *****************************************************************************/
219 static int Init( vout_thread_t *p_vout )
223 I_OUTPUTPICTURES = 0;
224 memset( &fmt, 0, sizeof(video_format_t) );
226 /* Initialize the output structure */
227 p_vout->output.i_chroma = p_vout->render.i_chroma;
228 p_vout->output.i_width = p_vout->render.i_width;
229 p_vout->output.i_height = p_vout->render.i_height;
230 p_vout->output.i_aspect = p_vout->render.i_aspect;
231 p_vout->fmt_out = p_vout->fmt_in;
232 fmt = p_vout->fmt_out;
234 /* Try to open the real video output */
235 msg_Dbg( p_vout, "spawning the real video output" );
237 if( p_vout->p_sys->b_rotation )
239 fmt.i_width = p_vout->fmt_out.i_height;
240 fmt.i_visible_width = p_vout->fmt_out.i_visible_height;
241 fmt.i_x_offset = p_vout->fmt_out.i_y_offset;
243 fmt.i_height = p_vout->fmt_out.i_width;
244 fmt.i_visible_height = p_vout->fmt_out.i_visible_width;
245 fmt.i_y_offset = p_vout->fmt_out.i_x_offset;
247 fmt.i_sar_num = p_vout->fmt_out.i_sar_den;
248 fmt.i_sar_den = p_vout->fmt_out.i_sar_num;
251 p_vout->p_sys->p_vout = vout_Create( p_vout, &fmt );
253 /* Everything failed */
254 if( p_vout->p_sys->p_vout == NULL )
256 msg_Err( p_vout, "cannot open vout, aborting" );
260 vout_filter_AllocateDirectBuffers( p_vout, VOUT_MAX_PICTURES );
262 vout_filter_AddChild( p_vout, p_vout->p_sys->p_vout, MouseEvent );
267 /*****************************************************************************
268 * End: terminate Transform video thread output method
269 *****************************************************************************/
270 static void End( vout_thread_t *p_vout )
272 vout_sys_t *p_sys = p_vout->p_sys;
274 vout_filter_DelChild( p_vout, p_sys->p_vout, MouseEvent );
275 vout_CloseAndRelease( p_sys->p_vout );
277 vout_filter_ReleaseDirectBuffers( p_vout );
280 /*****************************************************************************
281 * Destroy: destroy Transform video thread output method
282 *****************************************************************************
283 * Terminate an output method created by TransformCreateOutputMethod
284 *****************************************************************************/
285 static void Destroy( vlc_object_t *p_this )
287 vout_thread_t *p_vout = (vout_thread_t *)p_this;
289 free( p_vout->p_sys );
292 /*****************************************************************************
293 * Render: displays previously rendered output
294 *****************************************************************************
295 * This function send the currently rendered image to Transform image, waits
296 * until it is displayed and switch the two rendering buffers, preparing next
298 *****************************************************************************/
299 static void Render( vout_thread_t *p_vout, picture_t *p_pic )
303 /* This is a new frame. Get a structure from the video_output. */
304 while( ( p_outpic = vout_CreatePicture( p_vout->p_sys->p_vout, 0, 0, 0 ) )
307 if( !vlc_object_alive (p_vout) || p_vout->b_error )
311 msleep( VOUT_OUTMEM_SLEEP );
314 p_outpic->date = p_pic->date;
315 vout_LinkPicture( p_vout->p_sys->p_vout, p_outpic );
317 p_vout->p_sys->pf_filter( p_vout, p_pic, p_outpic );
319 vout_UnlinkPicture( p_vout->p_sys->p_vout, p_outpic );
321 vout_DisplayPicture( p_vout->p_sys->p_vout, p_outpic );
325 * Forward mouse event with proper conversion.
327 static int MouseEvent( vlc_object_t *p_this, char const *psz_var,
328 vlc_value_t oldval, vlc_value_t newval, void *p_data )
330 vout_thread_t *p_vout = p_data;
331 VLC_UNUSED(p_this); VLC_UNUSED(oldval);
333 /* Translate the mouse coordinates
334 * FIXME missing lock */
335 if( !strcmp( psz_var, "mouse-x" ) )
337 switch( p_vout->p_sys->i_mode )
339 case TRANSFORM_MODE_270:
340 newval.i_int = p_vout->p_sys->p_vout->output.i_width
342 case TRANSFORM_MODE_90:
346 case TRANSFORM_MODE_180:
347 case TRANSFORM_MODE_HFLIP:
348 newval.i_int = p_vout->p_sys->p_vout->output.i_width
352 case TRANSFORM_MODE_VFLIP:
357 else if( !strcmp( psz_var, "mouse-y" ) )
359 switch( p_vout->p_sys->i_mode )
361 case TRANSFORM_MODE_90:
362 newval.i_int = p_vout->p_sys->p_vout->output.i_height
364 case TRANSFORM_MODE_270:
368 case TRANSFORM_MODE_180:
369 case TRANSFORM_MODE_VFLIP:
370 newval.i_int = p_vout->p_sys->p_vout->output.i_height
374 case TRANSFORM_MODE_HFLIP:
380 return var_Set( p_vout, psz_var, newval );
383 static void FilterPlanar( vout_thread_t *p_vout,
384 const picture_t *p_pic, picture_t *p_outpic )
387 switch( p_vout->p_sys->i_mode )
389 case TRANSFORM_MODE_90:
390 for( i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
392 int i_pitch = p_pic->p[i_index].i_pitch;
394 uint8_t *p_in = p_pic->p[i_index].p_pixels;
396 uint8_t *p_out = p_outpic->p[i_index].p_pixels;
397 uint8_t *p_out_end = p_out +
398 p_outpic->p[i_index].i_visible_lines *
399 p_outpic->p[i_index].i_pitch;
401 for( ; p_out < p_out_end ; )
405 p_out_end -= p_outpic->p[i_index].i_pitch
406 - p_outpic->p[i_index].i_visible_pitch;
407 p_line_end = p_in + p_pic->p[i_index].i_visible_lines *
410 for( ; p_in < p_line_end ; )
412 p_line_end -= i_pitch;
413 *(--p_out_end) = *p_line_end;
421 case TRANSFORM_MODE_180:
422 for( i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
424 uint8_t *p_in = p_pic->p[i_index].p_pixels;
425 uint8_t *p_in_end = p_in + p_pic->p[i_index].i_visible_lines
426 * p_pic->p[i_index].i_pitch;
428 uint8_t *p_out = p_outpic->p[i_index].p_pixels;
430 for( ; p_in < p_in_end ; )
432 uint8_t *p_line_start = p_in_end
433 - p_pic->p[i_index].i_pitch;
434 p_in_end -= p_pic->p[i_index].i_pitch
435 - p_pic->p[i_index].i_visible_pitch;
437 for( ; p_line_start < p_in_end ; )
439 *p_out++ = *(--p_in_end);
442 p_out += p_outpic->p[i_index].i_pitch
443 - p_outpic->p[i_index].i_visible_pitch;
448 case TRANSFORM_MODE_270:
449 for( i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
451 int i_pitch = p_pic->p[i_index].i_pitch;
453 uint8_t *p_in = p_pic->p[i_index].p_pixels;
455 uint8_t *p_out = p_outpic->p[i_index].p_pixels;
456 uint8_t *p_out_end = p_out +
457 p_outpic->p[i_index].i_visible_lines *
458 p_outpic->p[i_index].i_pitch;
460 for( ; p_out < p_out_end ; )
464 p_in_end = p_in + p_pic->p[i_index].i_visible_lines *
467 for( ; p_in < p_in_end ; )
470 *p_out++ = *p_in_end;
473 p_out += p_outpic->p[i_index].i_pitch
474 - p_outpic->p[i_index].i_visible_pitch;
480 case TRANSFORM_MODE_HFLIP:
481 for( i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
483 uint8_t *p_in = p_pic->p[i_index].p_pixels;
484 uint8_t *p_in_end = p_in + p_pic->p[i_index].i_visible_lines
485 * p_pic->p[i_index].i_pitch;
487 uint8_t *p_out = p_outpic->p[i_index].p_pixels;
489 for( ; p_in < p_in_end ; )
491 p_in_end -= p_pic->p[i_index].i_pitch;
492 vlc_memcpy( p_out, p_in_end,
493 p_pic->p[i_index].i_visible_pitch );
494 p_out += p_pic->p[i_index].i_pitch;
499 case TRANSFORM_MODE_VFLIP:
500 for( i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
502 uint8_t *p_in = p_pic->p[i_index].p_pixels;
503 uint8_t *p_in_end = p_in + p_pic->p[i_index].i_visible_lines
504 * p_pic->p[i_index].i_pitch;
506 uint8_t *p_out = p_outpic->p[i_index].p_pixels;
508 for( ; p_in < p_in_end ; )
510 uint8_t *p_line_end = p_in
511 + p_pic->p[i_index].i_visible_pitch;
513 for( ; p_in < p_line_end ; )
515 *p_out++ = *(--p_line_end);
518 p_in += p_pic->p[i_index].i_pitch;
528 static void FilterI422( vout_thread_t *p_vout,
529 const picture_t *p_pic, picture_t *p_outpic )
532 switch( p_vout->p_sys->i_mode )
534 case TRANSFORM_MODE_180:
535 case TRANSFORM_MODE_HFLIP:
536 case TRANSFORM_MODE_VFLIP:
537 /* Fall back on the default implementation */
538 FilterPlanar( p_vout, p_pic, p_outpic );
541 case TRANSFORM_MODE_90:
542 for( i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
544 int i_pitch = p_pic->p[i_index].i_pitch;
546 uint8_t *p_in = p_pic->p[i_index].p_pixels;
548 uint8_t *p_out = p_outpic->p[i_index].p_pixels;
549 uint8_t *p_out_end = p_out +
550 p_outpic->p[i_index].i_visible_lines *
551 p_outpic->p[i_index].i_pitch;
555 for( ; p_out < p_out_end ; )
559 p_out_end -= p_outpic->p[i_index].i_pitch
560 - p_outpic->p[i_index].i_visible_pitch;
561 p_line_end = p_in + p_pic->p[i_index].i_visible_lines *
564 for( ; p_in < p_line_end ; )
566 p_line_end -= i_pitch;
567 *(--p_out_end) = *p_line_end;
573 else /* i_index == 1 or 2 */
575 for( ; p_out < p_out_end ; )
577 uint8_t *p_line_end, *p_out_end2;
579 p_out_end -= p_outpic->p[i_index].i_pitch
580 - p_outpic->p[i_index].i_visible_pitch;
581 p_out_end2 = p_out_end - p_outpic->p[i_index].i_pitch;
582 p_line_end = p_in + p_pic->p[i_index].i_visible_lines *
585 for( ; p_in < p_line_end ; )
589 p_line_end -= i_pitch;
591 p_line_end -= i_pitch;
594 /* Trick for (x+y)/2 without overflow, based on
595 * x + y == (x ^ y) + 2 * (x & y) */
596 *(--p_out_end) = (p1 & p2) + ((p1 ^ p2) / 2);
597 *(--p_out_end2) = (p1 & p2) + ((p1 ^ p2) / 2);
600 p_out_end = p_out_end2;
607 case TRANSFORM_MODE_270:
608 for( i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
610 int i_pitch = p_pic->p[i_index].i_pitch;
612 uint8_t *p_in = p_pic->p[i_index].p_pixels;
614 uint8_t *p_out = p_outpic->p[i_index].p_pixels;
615 uint8_t *p_out_end = p_out +
616 p_outpic->p[i_index].i_visible_lines *
617 p_outpic->p[i_index].i_pitch;
621 for( ; p_out < p_out_end ; )
625 p_in_end = p_in + p_pic->p[i_index].i_visible_lines *
628 for( ; p_in < p_in_end ; )
631 *p_out++ = *p_in_end;
634 p_out += p_outpic->p[i_index].i_pitch
635 - p_outpic->p[i_index].i_visible_pitch;
639 else /* i_index == 1 or 2 */
641 for( ; p_out < p_out_end ; )
643 uint8_t *p_in_end, *p_out2;
645 p_in_end = p_in + p_pic->p[i_index].i_visible_lines *
647 p_out2 = p_out + p_outpic->p[i_index].i_pitch;
649 for( ; p_in < p_in_end ; )
658 /* Trick for (x+y)/2 without overflow, based on
659 * x + y == (x ^ y) + 2 * (x & y) */
660 *p_out++ = (p1 & p2) + ((p1 ^ p2) / 2);
661 *p_out2++ = (p1 & p2) + ((p1 ^ p2) / 2);
664 p_out2 += p_outpic->p[i_index].i_pitch
665 - p_outpic->p[i_index].i_visible_pitch;
678 static void FilterYUYV( vout_thread_t *p_vout,
679 const picture_t *p_pic, picture_t *p_outpic )
682 int i_y_offset, i_u_offset, i_v_offset;
683 if( GetPackedYuvOffsets( p_pic->format.i_chroma, &i_y_offset,
684 &i_u_offset, &i_v_offset ) != VLC_SUCCESS )
687 switch( p_vout->p_sys->i_mode )
689 case TRANSFORM_MODE_HFLIP:
690 /* Fall back on the default implementation */
691 FilterPlanar( p_vout, p_pic, p_outpic );
694 case TRANSFORM_MODE_90:
695 for( i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
697 int i_pitch = p_pic->p[i_index].i_pitch;
699 uint8_t *p_in = p_pic->p[i_index].p_pixels;
701 uint8_t *p_out = p_outpic->p[i_index].p_pixels;
702 uint8_t *p_out_end = p_out +
703 p_outpic->p[i_index].i_visible_lines *
704 p_outpic->p[i_index].i_pitch;
706 int i_offset = i_u_offset;
707 int i_offset2 = i_v_offset;
708 for( ; p_out < p_out_end ; )
712 p_out_end -= p_outpic->p[i_index].i_pitch
713 - p_outpic->p[i_index].i_visible_pitch;
714 p_line_end = p_in + p_pic->p[i_index].i_visible_lines *
717 for( ; p_in < p_line_end ; )
719 p_line_end -= i_pitch;
721 p_out_end[i_y_offset+2] = p_line_end[i_y_offset];
722 p_out_end[i_u_offset] = p_line_end[i_offset];
723 p_line_end -= i_pitch;
724 p_out_end[i_y_offset] = p_line_end[i_y_offset];
725 p_out_end[i_v_offset] = p_line_end[i_offset2];
732 i_offset = i_offset2;
739 case TRANSFORM_MODE_180:
740 for( i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
742 uint8_t *p_in = p_pic->p[i_index].p_pixels;
743 uint8_t *p_in_end = p_in + p_pic->p[i_index].i_visible_lines
744 * p_pic->p[i_index].i_pitch;
746 uint8_t *p_out = p_outpic->p[i_index].p_pixels;
748 for( ; p_in < p_in_end ; )
750 uint8_t *p_line_start = p_in_end
751 - p_pic->p[i_index].i_pitch;
752 p_in_end -= p_pic->p[i_index].i_pitch
753 - p_pic->p[i_index].i_visible_pitch;
755 for( ; p_line_start < p_in_end ; )
758 p_out[i_y_offset] = p_in_end[i_y_offset+2];
759 p_out[i_u_offset] = p_in_end[i_u_offset];
760 p_out[i_y_offset+2] = p_in_end[i_y_offset];
761 p_out[i_v_offset] = p_in_end[i_v_offset];
765 p_out += p_outpic->p[i_index].i_pitch
766 - p_outpic->p[i_index].i_visible_pitch;
771 case TRANSFORM_MODE_270:
772 for( i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
774 int i_pitch = p_pic->p[i_index].i_pitch;
776 uint8_t *p_in = p_pic->p[i_index].p_pixels;
778 uint8_t *p_out = p_outpic->p[i_index].p_pixels;
779 uint8_t *p_out_end = p_out +
780 p_outpic->p[i_index].i_visible_lines *
781 p_outpic->p[i_index].i_pitch;
783 int i_offset = i_u_offset;
784 int i_offset2 = i_v_offset;
785 for( ; p_out < p_out_end ; )
790 + p_pic->p[i_index].i_visible_lines * i_pitch;
792 for( ; p_in < p_in_end ; )
795 p_out[i_y_offset] = p_in_end[i_y_offset];
796 p_out[i_u_offset] = p_in_end[i_offset];
798 p_out[i_y_offset+2] = p_in_end[i_y_offset];
799 p_out[i_v_offset] = p_in_end[i_offset2];
803 p_out += p_outpic->p[i_index].i_pitch
804 - p_outpic->p[i_index].i_visible_pitch;
809 i_offset = i_offset2;
816 case TRANSFORM_MODE_VFLIP:
817 for( i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
819 uint8_t *p_in = p_pic->p[i_index].p_pixels;
820 uint8_t *p_in_end = p_in + p_pic->p[i_index].i_visible_lines
821 * p_pic->p[i_index].i_pitch;
823 uint8_t *p_out = p_outpic->p[i_index].p_pixels;
825 for( ; p_in < p_in_end ; )
827 uint8_t *p_line_end = p_in
828 + p_pic->p[i_index].i_visible_pitch;
830 for( ; p_in < p_line_end ; )
833 p_out[i_y_offset] = p_line_end[i_y_offset+2];
834 p_out[i_u_offset] = p_line_end[i_u_offset];
835 p_out[i_y_offset+2] = p_line_end[i_y_offset];
836 p_out[i_v_offset] = p_line_end[i_v_offset];
840 p_in += p_pic->p[i_index].i_pitch;