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screen.c
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screen.c
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/* vi:set ts=8 sts=4 sw=4:
*
* VIM - Vi IMproved by Bram Moolenaar
*
* Do ":help uganda" in Vim to read copying and usage conditions.
* Do ":help credits" in Vim to see a list of people who contributed.
* See README.txt for an overview of the Vim source code.
*/
/*
* screen.c: code for displaying on the screen
*
* Output to the screen (console, terminal emulator or GUI window) is minimized
* by remembering what is already on the screen, and only updating the parts
* that changed.
*
* ScreenLines[off] Contains a copy of the whole screen, as it is currently
* displayed (excluding text written by external commands).
* ScreenAttrs[off] Contains the associated attributes.
* LineOffset[row] Contains the offset into ScreenLines*[] and ScreenAttrs[]
* for each line.
* LineWraps[row] Flag for each line whether it wraps to the next line.
*
* For double-byte characters, two consecutive bytes in ScreenLines[] can form
* one character which occupies two display cells.
* For UTF-8 a multi-byte character is converted to Unicode and stored in
* ScreenLinesUC[]. ScreenLines[] contains the first byte only. For an ASCII
* character without composing chars ScreenLinesUC[] will be 0. When the
* character occupies two display cells the next byte in ScreenLines[] is 0.
* ScreenLinesC[][] contain up to 'maxcombine' composing characters
* (drawn on top of the first character). They are 0 when not used.
* ScreenLines2[] is only used for euc-jp to store the second byte if the
* first byte is 0x8e (single-width character).
*
* The screen_*() functions write to the screen and handle updating
* ScreenLines[].
*
* update_screen() is the function that updates all windows and status lines.
* It is called form the main loop when must_redraw is non-zero. It may be
* called from other places when an immediate screen update is needed.
*
* The part of the buffer that is displayed in a window is set with:
* - w_topline (first buffer line in window)
* - w_topfill (filler line above the first line)
* - w_leftcol (leftmost window cell in window),
* - w_skipcol (skipped window cells of first line)
*
* Commands that only move the cursor around in a window, do not need to take
* action to update the display. The main loop will check if w_topline is
* valid and update it (scroll the window) when needed.
*
* Commands that scroll a window change w_topline and must call
* check_cursor() to move the cursor into the visible part of the window, and
* call redraw_later(VALID) to have the window displayed by update_screen()
* later.
*
* Commands that change text in the buffer must call changed_bytes() or
* changed_lines() to mark the area that changed and will require updating
* later. The main loop will call update_screen(), which will update each
* window that shows the changed buffer. This assumes text above the change
* can remain displayed as it is. Text after the change may need updating for
* scrolling, folding and syntax highlighting.
*
* Commands that change how a window is displayed (e.g., setting 'list') or
* invalidate the contents of a window in another way (e.g., change fold
* settings), must call redraw_later(NOT_VALID) to have the whole window
* redisplayed by update_screen() later.
*
* Commands that change how a buffer is displayed (e.g., setting 'tabstop')
* must call redraw_curbuf_later(NOT_VALID) to have all the windows for the
* buffer redisplayed by update_screen() later.
*
* Commands that change highlighting and possibly cause a scroll too must call
* redraw_later(SOME_VALID) to update the whole window but still use scrolling
* to avoid redrawing everything. But the length of displayed lines must not
* change, use NOT_VALID then.
*
* Commands that move the window position must call redraw_later(NOT_VALID).
* TODO: should minimize redrawing by scrolling when possible.
*
* Commands that change everything (e.g., resizing the screen) must call
* redraw_all_later(NOT_VALID) or redraw_all_later(CLEAR).
*
* Things that are handled indirectly:
* - When messages scroll the screen up, msg_scrolled will be set and
* update_screen() called to redraw.
*/
#include "vim.h"
/*
* The attributes that are actually active for writing to the screen.
*/
static int screen_attr = 0;
/*
* Positioning the cursor is reduced by remembering the last position.
* Mostly used by windgoto() and screen_char().
*/
static int screen_cur_row, screen_cur_col; /* last known cursor position */
#ifdef FEAT_SEARCH_EXTRA
/*
* Struct used for highlighting 'hlsearch' matches for the last use search
* pattern or a ":match" item.
* For 'hlsearch' there is one pattern for all windows. For ":match" there is
* a different pattern for each window.
*/
typedef struct
{
regmmatch_T rm; /* points to the regexp program; contains last found
match (may continue in next line) */
buf_T *buf; /* the buffer to search for a match */
linenr_T lnum; /* the line to search for a match */
int attr; /* attributes to be used for a match */
int attr_cur; /* attributes currently active in win_line() */
linenr_T first_lnum; /* first lnum to search for multi-line pat */
colnr_T startcol; /* in win_line() points to char where HL starts */
colnr_T endcol; /* in win_line() points to char where HL ends */
} match_T;
static match_T search_hl; /* used for 'hlsearch' highlight matching */
static match_T match_hl[3]; /* used for ":match" highlight matching */
#endif
#ifdef FEAT_FOLDING
static foldinfo_T win_foldinfo; /* info for 'foldcolumn' */
#endif
/*
* Buffer for one screen line (characters and attributes).
*/
static schar_T *current_ScreenLine;
static void win_update __ARGS((win_T *wp));
static void win_draw_end __ARGS((win_T *wp, int c1, int c2, int row, int endrow, hlf_T hl));
#ifdef FEAT_FOLDING
static void fold_line __ARGS((win_T *wp, long fold_count, foldinfo_T *foldinfo, linenr_T lnum, int row));
static void fill_foldcolumn __ARGS((char_u *p, win_T *wp, int closed, linenr_T lnum));
static void copy_text_attr __ARGS((int off, char_u *buf, int len, int attr));
#endif
static int win_line __ARGS((win_T *, linenr_T, int, int, int nochange));
static int char_needs_redraw __ARGS((int off_from, int off_to, int cols));
#ifdef FEAT_RIGHTLEFT
static void screen_line __ARGS((int row, int coloff, int endcol, int clear_width, int rlflag));
# define SCREEN_LINE(r, o, e, c, rl) screen_line((r), (o), (e), (c), (rl))
#else
static void screen_line __ARGS((int row, int coloff, int endcol, int clear_width));
# define SCREEN_LINE(r, o, e, c, rl) screen_line((r), (o), (e), (c))
#endif
#ifdef FEAT_VERTSPLIT
static void draw_vsep_win __ARGS((win_T *wp, int row));
#endif
#ifdef FEAT_STL_OPT
static void redraw_custum_statusline __ARGS((win_T *wp));
#endif
#ifdef FEAT_SEARCH_EXTRA
static void start_search_hl __ARGS((void));
static void end_search_hl __ARGS((void));
static void prepare_search_hl __ARGS((win_T *wp, linenr_T lnum));
static void next_search_hl __ARGS((win_T *win, match_T *shl, linenr_T lnum, colnr_T mincol));
#endif
static void screen_start_highlight __ARGS((int attr));
static void screen_char __ARGS((unsigned off, int row, int col));
#ifdef FEAT_MBYTE
static void screen_char_2 __ARGS((unsigned off, int row, int col));
#endif
static void screenclear2 __ARGS((void));
static void lineclear __ARGS((unsigned off, int width));
static void lineinvalid __ARGS((unsigned off, int width));
#ifdef FEAT_VERTSPLIT
static void linecopy __ARGS((int to, int from, win_T *wp));
static void redraw_block __ARGS((int row, int end, win_T *wp));
#endif
static int win_do_lines __ARGS((win_T *wp, int row, int line_count, int mayclear, int del));
static void win_rest_invalid __ARGS((win_T *wp));
static void msg_pos_mode __ARGS((void));
#if defined(FEAT_WINDOWS)
static void draw_tabline __ARGS((void));
#endif
#if defined(FEAT_WINDOWS) || defined(FEAT_WILDMENU) || defined(FEAT_STL_OPT)
static int fillchar_status __ARGS((int *attr, int is_curwin));
#endif
#ifdef FEAT_VERTSPLIT
static int fillchar_vsep __ARGS((int *attr));
#endif
#ifdef FEAT_STL_OPT
static void win_redr_custom __ARGS((win_T *wp, int draw_ruler));
#endif
#ifdef FEAT_CMDL_INFO
static void win_redr_ruler __ARGS((win_T *wp, int always));
#endif
#if defined(FEAT_CLIPBOARD) || defined(FEAT_VERTSPLIT)
/* Ugly global: overrule attribute used by screen_char() */
static int screen_char_attr = 0;
#endif
/*
* Redraw the current window later, with update_screen(type).
* Set must_redraw only if not already set to a higher value.
* e.g. if must_redraw is CLEAR, type NOT_VALID will do nothing.
*/
void
redraw_later(type)
int type;
{
redraw_win_later(curwin, type);
}
void
redraw_win_later(wp, type)
win_T *wp;
int type;
{
if (wp->w_redr_type < type)
{
wp->w_redr_type = type;
if (type >= NOT_VALID)
wp->w_lines_valid = 0;
if (must_redraw < type) /* must_redraw is the maximum of all windows */
must_redraw = type;
}
}
/*
* Force a complete redraw later. Also resets the highlighting. To be used
* after executing a shell command that messes up the screen.
*/
void
redraw_later_clear()
{
redraw_all_later(CLEAR);
#ifdef FEAT_GUI
if (gui.in_use)
/* Use a code that will reset gui.highlight_mask in
* gui_stop_highlight(). */
screen_attr = HL_ALL + 1;
else
#endif
/* Use attributes that is very unlikely to appear in text. */
screen_attr = HL_BOLD | HL_UNDERLINE | HL_INVERSE;
}
/*
* Mark all windows to be redrawn later.
*/
void
redraw_all_later(type)
int type;
{
win_T *wp;
FOR_ALL_WINDOWS(wp)
{
redraw_win_later(wp, type);
}
}
/*
* Mark all windows that are editing the current buffer to be updated later.
*/
void
redraw_curbuf_later(type)
int type;
{
redraw_buf_later(curbuf, type);
}
void
redraw_buf_later(buf, type)
buf_T *buf;
int type;
{
win_T *wp;
FOR_ALL_WINDOWS(wp)
{
if (wp->w_buffer == buf)
redraw_win_later(wp, type);
}
}
/*
* Changed something in the current window, at buffer line "lnum", that
* requires that line and possibly other lines to be redrawn.
* Used when entering/leaving Insert mode with the cursor on a folded line.
* Used to remove the "$" from a change command.
* Note that when also inserting/deleting lines w_redraw_top and w_redraw_bot
* may become invalid and the whole window will have to be redrawn.
*/
/*ARGSUSED*/
void
redrawWinline(lnum, invalid)
linenr_T lnum;
int invalid; /* window line height is invalid now */
{
#ifdef FEAT_FOLDING
int i;
#endif
if (curwin->w_redraw_top == 0 || curwin->w_redraw_top > lnum)
curwin->w_redraw_top = lnum;
if (curwin->w_redraw_bot == 0 || curwin->w_redraw_bot < lnum)
curwin->w_redraw_bot = lnum;
redraw_later(VALID);
#ifdef FEAT_FOLDING
if (invalid)
{
/* A w_lines[] entry for this lnum has become invalid. */
i = find_wl_entry(curwin, lnum);
if (i >= 0)
curwin->w_lines[i].wl_valid = FALSE;
}
#endif
}
/*
* update all windows that are editing the current buffer
*/
void
update_curbuf(type)
int type;
{
redraw_curbuf_later(type);
update_screen(type);
}
/*
* update_screen()
*
* Based on the current value of curwin->w_topline, transfer a screenfull
* of stuff from Filemem to ScreenLines[], and update curwin->w_botline.
*/
void
update_screen(type)
int type;
{
win_T *wp;
static int did_intro = FALSE;
#if defined(FEAT_SEARCH_EXTRA) || defined(FEAT_CLIPBOARD)
int did_one;
#endif
if (!screen_valid(TRUE))
return;
if (must_redraw)
{
if (type < must_redraw) /* use maximal type */
type = must_redraw;
must_redraw = 0;
}
/* Need to update w_lines[]. */
if (curwin->w_lines_valid == 0 && type < NOT_VALID)
type = NOT_VALID;
if (!redrawing())
{
redraw_later(type); /* remember type for next time */
must_redraw = type;
if (type > INVERTED_ALL)
curwin->w_lines_valid = 0; /* don't use w_lines[].wl_size now */
return;
}
updating_screen = TRUE;
#ifdef FEAT_SYN_HL
++display_tick; /* let syntax code know we're in a next round of
* display updating */
#endif
/*
* if the screen was scrolled up when displaying a message, scroll it down
*/
if (msg_scrolled)
{
clear_cmdline = TRUE;
if (msg_scrolled > Rows - 5) /* clearing is faster */
type = CLEAR;
else if (type != CLEAR)
{
check_for_delay(FALSE);
if (screen_ins_lines(0, 0, msg_scrolled, (int)Rows, NULL) == FAIL)
type = CLEAR;
FOR_ALL_WINDOWS(wp)
{
if (W_WINROW(wp) < msg_scrolled)
{
if (W_WINROW(wp) + wp->w_height > msg_scrolled
&& wp->w_redr_type < REDRAW_TOP
&& wp->w_lines_valid > 0
&& wp->w_topline == wp->w_lines[0].wl_lnum)
{
wp->w_upd_rows = msg_scrolled - W_WINROW(wp);
wp->w_redr_type = REDRAW_TOP;
}
else
{
wp->w_redr_type = NOT_VALID;
#ifdef FEAT_WINDOWS
if (W_WINROW(wp) + wp->w_height + W_STATUS_HEIGHT(wp)
<= msg_scrolled)
wp->w_redr_status = TRUE;
#endif
}
}
}
redraw_cmdline = TRUE;
#ifdef FEAT_WINDOWS
redraw_tabline = TRUE;
#endif
}
msg_scrolled = 0;
need_wait_return = FALSE;
}
/* reset cmdline_row now (may have been changed temporarily) */
compute_cmdrow();
/* Check for changed highlighting */
if (need_highlight_changed)
highlight_changed();
if (type == CLEAR) /* first clear screen */
{
screenclear(); /* will reset clear_cmdline */
type = NOT_VALID;
}
if (clear_cmdline) /* going to clear cmdline (done below) */
check_for_delay(FALSE);
#ifdef FEAT_LINEBREAK
/* Force redraw when width of 'number' column changes. */
if (curwin->w_redr_type < NOT_VALID
&& curwin->w_nrwidth != (curwin->w_p_nu ? number_width(curwin) : 0))
curwin->w_redr_type = NOT_VALID;
#endif
/*
* Only start redrawing if there is really something to do.
*/
if (type == INVERTED)
update_curswant();
if (curwin->w_redr_type < type
&& !((type == VALID
&& curwin->w_lines[0].wl_valid
#ifdef FEAT_DIFF
&& curwin->w_topfill == curwin->w_old_topfill
&& curwin->w_botfill == curwin->w_old_botfill
#endif
&& curwin->w_topline == curwin->w_lines[0].wl_lnum)
#ifdef FEAT_VISUAL
|| (type == INVERTED
&& VIsual_active
&& curwin->w_old_cursor_lnum == curwin->w_cursor.lnum
&& curwin->w_old_visual_mode == VIsual_mode
&& (curwin->w_valid & VALID_VIRTCOL)
&& curwin->w_old_curswant == curwin->w_curswant)
#endif
))
curwin->w_redr_type = type;
#ifdef FEAT_WINDOWS
/* Redraw the tab pages line if needed. */
if (redraw_tabline || type >= NOT_VALID)
draw_tabline();
#endif
#ifdef FEAT_SYN_HL
/*
* Correct stored syntax highlighting info for changes in each displayed
* buffer. Each buffer must only be done once.
*/
FOR_ALL_WINDOWS(wp)
{
if (wp->w_buffer->b_mod_set)
{
# ifdef FEAT_WINDOWS
win_T *wwp;
/* Check if we already did this buffer. */
for (wwp = firstwin; wwp != wp; wwp = wwp->w_next)
if (wwp->w_buffer == wp->w_buffer)
break;
# endif
if (
# ifdef FEAT_WINDOWS
wwp == wp &&
# endif
syntax_present(wp->w_buffer))
syn_stack_apply_changes(wp->w_buffer);
}
}
#endif
/*
* Go from top to bottom through the windows, redrawing the ones that need
* it.
*/
#if defined(FEAT_SEARCH_EXTRA) || defined(FEAT_CLIPBOARD)
did_one = FALSE;
#endif
#ifdef FEAT_SEARCH_EXTRA
search_hl.rm.regprog = NULL;
#endif
FOR_ALL_WINDOWS(wp)
{
if (wp->w_redr_type != 0)
{
cursor_off();
#if defined(FEAT_SEARCH_EXTRA) || defined(FEAT_CLIPBOARD)
if (!did_one)
{
did_one = TRUE;
# ifdef FEAT_SEARCH_EXTRA
start_search_hl();
# endif
# ifdef FEAT_CLIPBOARD
/* When Visual area changed, may have to update selection. */
if (clip_star.available && clip_isautosel())
clip_update_selection();
# endif
#ifdef FEAT_GUI
/* Remove the cursor before starting to do anything, because
* scrolling may make it difficult to redraw the text under
* it. */
if (gui.in_use)
gui_undraw_cursor();
#endif
}
#endif
win_update(wp);
}
#ifdef FEAT_WINDOWS
/* redraw status line after the window to minimize cursor movement */
if (wp->w_redr_status)
{
cursor_off();
win_redr_status(wp);
}
#endif
}
#if defined(FEAT_SEARCH_EXTRA)
end_search_hl();
#endif
#ifdef FEAT_WINDOWS
/* Reset b_mod_set flags. Going through all windows is probably faster
* than going through all buffers (there could be many buffers). */
for (wp = firstwin; wp != NULL; wp = wp->w_next)
wp->w_buffer->b_mod_set = FALSE;
#else
curbuf->b_mod_set = FALSE;
#endif
updating_screen = FALSE;
#ifdef FEAT_GUI
gui_may_resize_shell();
#endif
/* Clear or redraw the command line. Done last, because scrolling may
* mess up the command line. */
if (clear_cmdline || redraw_cmdline)
showmode();
/* May put up an introductory message when not editing a file */
if (!did_intro && bufempty()
&& curbuf->b_fname == NULL
#ifdef FEAT_WINDOWS
&& firstwin->w_next == NULL
#endif
&& vim_strchr(p_shm, SHM_INTRO) == NULL)
intro_message(FALSE);
did_intro = TRUE;
#ifdef FEAT_GUI
/* Redraw the cursor and update the scrollbars when all screen updating is
* done. */
if (gui.in_use)
{
out_flush(); /* required before updating the cursor */
if (did_one)
gui_update_cursor(FALSE, FALSE);
gui_update_scrollbars(FALSE);
}
#endif
}
#if defined(FEAT_SIGNS) || defined(FEAT_GUI)
static void update_prepare __ARGS((void));
static void update_finish __ARGS((void));
/*
* Prepare for updating one or more windows.
*/
static void
update_prepare()
{
cursor_off();
updating_screen = TRUE;
#ifdef FEAT_GUI
/* Remove the cursor before starting to do anything, because scrolling may
* make it difficult to redraw the text under it. */
if (gui.in_use)
gui_undraw_cursor();
#endif
#ifdef FEAT_SEARCH_EXTRA
start_search_hl();
#endif
}
/*
* Finish updating one or more windows.
*/
static void
update_finish()
{
if (redraw_cmdline)
showmode();
# ifdef FEAT_SEARCH_EXTRA
end_search_hl();
# endif
updating_screen = FALSE;
# ifdef FEAT_GUI
gui_may_resize_shell();
/* Redraw the cursor and update the scrollbars when all screen updating is
* done. */
if (gui.in_use)
{
out_flush(); /* required before updating the cursor */
gui_update_cursor(FALSE, FALSE);
gui_update_scrollbars(FALSE);
}
# endif
}
#endif
#if defined(FEAT_SIGNS) || defined(PROTO)
void
update_debug_sign(buf, lnum)
buf_T *buf;
linenr_T lnum;
{
win_T *wp;
int doit = FALSE;
# ifdef FEAT_FOLDING
win_foldinfo.fi_level = 0;
# endif
/* update/delete a specific mark */
FOR_ALL_WINDOWS(wp)
{
if (buf != NULL && lnum > 0)
{
if (wp->w_buffer == buf && lnum >= wp->w_topline
&& lnum < wp->w_botline)
{
if (wp->w_redraw_top == 0 || wp->w_redraw_top > lnum)
wp->w_redraw_top = lnum;
if (wp->w_redraw_bot == 0 || wp->w_redraw_bot < lnum)
wp->w_redraw_bot = lnum;
redraw_win_later(wp, VALID);
}
}
else
redraw_win_later(wp, VALID);
if (wp->w_redr_type != 0)
doit = TRUE;
}
if (!doit)
return;
/* update all windows that need updating */
update_prepare();
# ifdef FEAT_WINDOWS
for (wp = firstwin; wp; wp = wp->w_next)
{
if (wp->w_redr_type != 0)
win_update(wp);
if (wp->w_redr_status)
win_redr_status(wp);
}
# else
if (curwin->w_redr_type != 0)
win_update(curwin);
# endif
update_finish();
}
#endif
#if defined(FEAT_GUI) || defined(PROTO)
/*
* Update a single window, its status line and maybe the command line msg.
* Used for the GUI scrollbar.
*/
void
updateWindow(wp)
win_T *wp;
{
update_prepare();
#ifdef FEAT_CLIPBOARD
/* When Visual area changed, may have to update selection. */
if (clip_star.available && clip_isautosel())
clip_update_selection();
#endif
win_update(wp);
#ifdef FEAT_WINDOWS
/* When the screen was cleared redraw the tab pages line. */
if (redraw_tabline)
draw_tabline();
if (wp->w_redr_status
# ifdef FEAT_CMDL_INFO
|| p_ru
# endif
# ifdef FEAT_STL_OPT
|| *p_stl != NUL || *wp->w_p_stl != NUL
# endif
)
win_redr_status(wp);
#endif
update_finish();
}
#endif
/*
* Update a single window.
*
* This may cause the windows below it also to be redrawn (when clearing the
* screen or scrolling lines).
*
* How the window is redrawn depends on wp->w_redr_type. Each type also
* implies the one below it.
* NOT_VALID redraw the whole window
* SOME_VALID redraw the whole window but do scroll when possible
* REDRAW_TOP redraw the top w_upd_rows window lines, otherwise like VALID
* INVERTED redraw the changed part of the Visual area
* INVERTED_ALL redraw the whole Visual area
* VALID 1. scroll up/down to adjust for a changed w_topline
* 2. update lines at the top when scrolled down
* 3. redraw changed text:
* - if wp->w_buffer->b_mod_set set, update lines between
* b_mod_top and b_mod_bot.
* - if wp->w_redraw_top non-zero, redraw lines between
* wp->w_redraw_top and wp->w_redr_bot.
* - continue redrawing when syntax status is invalid.
* 4. if scrolled up, update lines at the bottom.
* This results in three areas that may need updating:
* top: from first row to top_end (when scrolled down)
* mid: from mid_start to mid_end (update inversion or changed text)
* bot: from bot_start to last row (when scrolled up)
*/
static void
win_update(wp)
win_T *wp;
{
buf_T *buf = wp->w_buffer;
int type;
int top_end = 0; /* Below last row of the top area that needs
updating. 0 when no top area updating. */
int mid_start = 999;/* first row of the mid area that needs
updating. 999 when no mid area updating. */
int mid_end = 0; /* Below last row of the mid area that needs
updating. 0 when no mid area updating. */
int bot_start = 999;/* first row of the bot area that needs
updating. 999 when no bot area updating */
#ifdef FEAT_VISUAL
int scrolled_down = FALSE; /* TRUE when scrolled down when
w_topline got smaller a bit */
#endif
#ifdef FEAT_SEARCH_EXTRA
int top_to_mod = FALSE; /* redraw above mod_top */
#endif
int row; /* current window row to display */
linenr_T lnum; /* current buffer lnum to display */
int idx; /* current index in w_lines[] */
int srow; /* starting row of the current line */
int eof = FALSE; /* if TRUE, we hit the end of the file */
int didline = FALSE; /* if TRUE, we finished the last line */
int i;
long j;
static int recursive = FALSE; /* being called recursively */
int old_botline = wp->w_botline;
#ifdef FEAT_FOLDING
long fold_count;
#endif
#ifdef FEAT_SYN_HL
/* remember what happened to the previous line, to know if
* check_visual_highlight() can be used */
#define DID_NONE 1 /* didn't update a line */
#define DID_LINE 2 /* updated a normal line */
#define DID_FOLD 3 /* updated a folded line */
int did_update = DID_NONE;
linenr_T syntax_last_parsed = 0; /* last parsed text line */
#endif
linenr_T mod_top = 0;
linenr_T mod_bot = 0;
#if defined(FEAT_SYN_HL) || defined(FEAT_SEARCH_EXTRA)
int save_got_int;
#endif
type = wp->w_redr_type;
if (type == NOT_VALID)
{
#ifdef FEAT_WINDOWS
wp->w_redr_status = TRUE;
#endif
wp->w_lines_valid = 0;
}
/* Window is zero-height: nothing to draw. */
if (wp->w_height == 0)
{
wp->w_redr_type = 0;
return;
}
#ifdef FEAT_VERTSPLIT
/* Window is zero-width: Only need to draw the separator. */
if (wp->w_width == 0)
{
/* draw the vertical separator right of this window */
draw_vsep_win(wp, 0);
wp->w_redr_type = 0;
return;
}
#endif
#ifdef FEAT_SEARCH_EXTRA
/* Setup for ":match" and 'hlsearch' highlighting. Disable any previous
* match */
for (i = 0; i < 3; ++i)
{
match_hl[i].rm = wp->w_match[i];
if (wp->w_match_id[i] == 0)
match_hl[i].attr = 0;
else
match_hl[i].attr = syn_id2attr(wp->w_match_id[i]);
match_hl[i].buf = buf;
match_hl[i].lnum = 0;
match_hl[i].first_lnum = 0;
}
search_hl.buf = buf;
search_hl.lnum = 0;
search_hl.first_lnum = 0;
#endif
#ifdef FEAT_LINEBREAK
/* Force redraw when width of 'number' column changes. */
i = wp->w_p_nu ? number_width(wp) : 0;
if (wp->w_nrwidth != i)
{
type = NOT_VALID;
wp->w_nrwidth = i;
}
else
#endif
if (buf->b_mod_set && buf->b_mod_xlines != 0 && wp->w_redraw_top != 0)
{
/*
* When there are both inserted/deleted lines and specific lines to be
* redrawn, w_redraw_top and w_redraw_bot may be invalid, just redraw
* everything (only happens when redrawing is off for while).
*/
type = NOT_VALID;
}
else
{
/*
* Set mod_top to the first line that needs displaying because of
* changes. Set mod_bot to the first line after the changes.
*/
mod_top = wp->w_redraw_top;
if (wp->w_redraw_bot != 0)
mod_bot = wp->w_redraw_bot + 1;
else
mod_bot = 0;
wp->w_redraw_top = 0; /* reset for next time */
wp->w_redraw_bot = 0;
if (buf->b_mod_set)
{
if (mod_top == 0 || mod_top > buf->b_mod_top)
{
mod_top = buf->b_mod_top;
#ifdef FEAT_SYN_HL
/* Need to redraw lines above the change that may be included
* in a pattern match. */
if (syntax_present(buf))
{
mod_top -= buf->b_syn_sync_linebreaks;
if (mod_top < 1)
mod_top = 1;
}
#endif
}
if (mod_bot == 0 || mod_bot < buf->b_mod_bot)
mod_bot = buf->b_mod_bot;
#ifdef FEAT_SEARCH_EXTRA
/* When 'hlsearch' is on and using a multi-line search pattern, a
* change in one line may make the Search highlighting in a
* previous line invalid. Simple solution: redraw all visible
* lines above the change.
* Same for a ":match" pattern.
*/
if (search_hl.rm.regprog != NULL
&& re_multiline(search_hl.rm.regprog))
top_to_mod = TRUE;
else
for (i = 0; i < 3; ++i)
if (match_hl[i].rm.regprog != NULL
&& re_multiline(match_hl[i].rm.regprog))
{
top_to_mod = TRUE;
break;
}
#endif
}
#ifdef FEAT_FOLDING
if (mod_top != 0 && hasAnyFolding(wp))
{
linenr_T lnumt, lnumb;
/*
* A change in a line can cause lines above it to become folded or
* unfolded. Find the top most buffer line that may be affected.
* If the line was previously folded and displayed, get the first
* line of that fold. If the line is folded now, get the first
* folded line. Use the minimum of these two.
*/
/* Find last valid w_lines[] entry above mod_top. Set lnumt to
* the line below it. If there is no valid entry, use w_topline.
* Find the first valid w_lines[] entry below mod_bot. Set lnumb
* to this line. If there is no valid entry, use MAXLNUM. */
lnumt = wp->w_topline;
lnumb = MAXLNUM;
for (i = 0; i < wp->w_lines_valid; ++i)
if (wp->w_lines[i].wl_valid)
{
if (wp->w_lines[i].wl_lastlnum < mod_top)
lnumt = wp->w_lines[i].wl_lastlnum + 1;
if (lnumb == MAXLNUM && wp->w_lines[i].wl_lnum >= mod_bot)
{
lnumb = wp->w_lines[i].wl_lnum;
/* When there is a fold column it might need updating
* in the next line ("J" just above an open fold). */
if (wp->w_p_fdc > 0)
++lnumb;
}
}
(void)hasFoldingWin(wp, mod_top, &mod_top, NULL, TRUE, NULL);
if (mod_top > lnumt)
mod_top = lnumt;
/* Now do the same for the bottom line (one above mod_bot). */
--mod_bot;
(void)hasFoldingWin(wp, mod_bot, NULL, &mod_bot, TRUE, NULL);
++mod_bot;
if (mod_bot < lnumb)
mod_bot = lnumb;
}
#endif
/* When a change starts above w_topline and the end is below
* w_topline, start redrawing at w_topline.
* If the end of the change is above w_topline: do like no change was
* made, but redraw the first line to find changes in syntax. */
if (mod_top != 0 && mod_top < wp->w_topline)
{
if (mod_bot > wp->w_topline)
mod_top = wp->w_topline;
#ifdef FEAT_SYN_HL
else if (syntax_present(buf))
top_end = 1;
#endif
}