mirror of https://github.com/tmux/tmux.git
430 lines
10 KiB
C
430 lines
10 KiB
C
/* $Id: screen.c,v 1.60 2008-06-03 21:42:37 nicm Exp $ */
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/*
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* Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
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* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <string.h>
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#include "tmux.h"
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/*
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* Virtual screen.
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*
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* A screen is stored as three arrays of lines of 8-bit values, one for the
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* actual characters (data), one for attributes and one for colours. Three
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* seperate blocks means memset and friends can be used. Each array is y by x
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* in size, row then column order. Sizes are 0-based. There is an additional
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* array of u_ints with the size of each line.
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*
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* Each screen has a history starting at the beginning of the arrays and
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* extending for hsize lines. Beyond that is the screen display of size
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* dy:
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*
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* ----------- array base
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* | |
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* | history |
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* ----------- array base + hsize
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* | |
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* | display |
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* | |
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* ----------- array base + hsize + dy
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*
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* The screen_x/screen_y macros are used to convert a cell on the displayed
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* area to an absolute position in the arrays.
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*
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* Screen handling code is split into four files:
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*
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* screen.c: Creation/deletion, utility functions, and basic functions to
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* manipulate the screen based on offsets from the base.
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* screen-display.c: Basic functions for manipulating the displayed
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* part of the screen. x,y coordinates passed to these
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* are relative to the display. These are largely
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* utility functions for screen-write.c.
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* screen-redraw.c: Functions for redrawing all or part of a screen to
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* one or more ttys. A context is filled via one of the
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* screen_redraw_start* variants which sets up (removes
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* cursor etc) and figures out which tty_write_* function
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* to use to write to the terminals, then the other
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* screen_redraw_* functions are used to draw the screen,
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* and screen_redraw_stop used to reset the cursor and
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* clean up. These are used when changing window and a
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* few other bits (status line).
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* screen-write.c: Functions for modifying (writing into) the screen and
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* optionally simultaneously updating one or more ttys.
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* These are used in much the same way as the redraw
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* functions. These are used to update when parsing
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* input from the window (input.c) and for the various
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* other modes which maintain private screens.
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*
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* If you're thinking this all seems too complicated, that's because it is :-/.
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*/
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/* Colour to string. */
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const char *
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screen_colourstring(u_char c)
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{
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switch (c) {
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case 0:
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return ("black");
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case 1:
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return ("red");
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case 2:
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return ("green");
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case 3:
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return ("yellow");
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case 4:
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return ("blue");
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case 5:
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return ("magenta");
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case 6:
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return ("cyan");
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case 7:
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return ("white");
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case 8:
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return ("default");
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}
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return (NULL);
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}
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/* String to colour. */
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u_char
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screen_stringcolour(const char *s)
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{
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if (strcasecmp(s, "black") == 0 || (s[0] == '0' && s[1] == '\0'))
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return (0);
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if (strcasecmp(s, "red") == 0 || (s[0] == '1' && s[1] == '\0'))
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return (1);
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if (strcasecmp(s, "green") == 0 || (s[0] == '2' && s[1] == '\0'))
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return (2);
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if (strcasecmp(s, "yellow") == 0 || (s[0] == '3' && s[1] == '\0'))
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return (3);
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if (strcasecmp(s, "blue") == 0 || (s[0] == '4' && s[1] == '\0'))
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return (4);
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if (strcasecmp(s, "magenta") == 0 || (s[0] == '5' && s[1] == '\0'))
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return (5);
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if (strcasecmp(s, "cyan") == 0 || (s[0] == '6' && s[1] == '\0'))
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return (6);
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if (strcasecmp(s, "white") == 0 || (s[0] == '7' && s[1] == '\0'))
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return (7);
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if (strcasecmp(s, "default") == 0 || (s[0] == '8' && s[1] == '\0'))
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return (8);
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return (255);
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}
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/* Create a new screen. */
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void
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screen_create(struct screen *s, u_int dx, u_int dy, u_int hlimit)
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{
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s->dx = dx;
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s->dy = dy;
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s->cx = 0;
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s->cy = 0;
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s->rupper = 0;
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s->rlower = s->dy - 1;
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s->hsize = 0;
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s->hlimit = hlimit;
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s->attr = SCREEN_DEFATTR;
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s->colr = SCREEN_DEFCOLR;
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s->mode = MODE_CURSOR|MODE_KCURSOR|MODE_KKEYPAD;
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s->title = xstrdup("");
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s->grid_data = xmalloc(dy * (sizeof *s->grid_data));
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s->grid_attr = xmalloc(dy * (sizeof *s->grid_attr));
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s->grid_colr = xmalloc(dy * (sizeof *s->grid_colr));
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s->grid_size = xmalloc(dy * (sizeof *s->grid_size));
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screen_make_lines(s, 0, dy);
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screen_clear_selection(s);
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}
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/* Resize screen. */
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void
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screen_resize(struct screen *s, u_int sx, u_int sy)
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{
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u_int i, ox, oy, ny, my;
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if (sx < 1)
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sx = 1;
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if (sy < 1)
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sy = 1;
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ox = s->dx;
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oy = s->dy;
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if (sx == ox && sy == oy)
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return;
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/*
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* X dimension.
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*/
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if (sx != ox) {
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/*
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* If getting smaller, nuke any data in lines over the new
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* size.
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*/
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if (sx < ox) {
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for (i = s->hsize; i < s->hsize + oy; i++) {
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if (s->grid_size[i] > sx)
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screen_reduce_line(s, i, sx);
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}
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}
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if (s->cx >= sx)
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s->cx = sx - 1;
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s->dx = sx;
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}
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/*
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* Y dimension.
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*/
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if (sy == oy)
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return;
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/* Size decreasing. */
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if (sy < oy) {
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ny = oy - sy;
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if (s->cy != 0) {
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/*
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* The cursor is not at the start. Try to remove as
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* many lines as possible from the top. (Up to the
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* cursor line.)
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*/
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my = s->cy;
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if (my > ny)
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my = ny;
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screen_free_lines(s, s->hsize, my);
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screen_move_lines(s, s->hsize, s->hsize + my, oy - my);
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s->cy -= my;
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oy -= my;
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}
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ny = oy - sy;
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if (ny > 0) {
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/*
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* Remove any remaining lines from the bottom.
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*/
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screen_free_lines(s, s->hsize + oy - ny, ny);
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if (s->cy >= sy)
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s->cy = sy - 1;
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}
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}
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/* Resize line arrays. */
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ny = s->hsize + sy;
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s->grid_data = xrealloc(s->grid_data, ny, sizeof *s->grid_data);
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s->grid_attr = xrealloc(s->grid_attr, ny, sizeof *s->grid_attr);
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s->grid_colr = xrealloc(s->grid_colr, ny, sizeof *s->grid_colr);
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s->grid_size = xrealloc(s->grid_size, ny, sizeof *s->grid_size);
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s->dy = sy;
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/* Size increasing. */
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if (sy > oy)
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screen_make_lines(s, s->hsize + oy, sy - oy);
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s->rupper = 0;
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s->rlower = s->dy - 1;
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}
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/* Expand line. */
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void
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screen_expand_line(struct screen *s, u_int py, u_int nx)
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{
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u_int ox;
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ox = s->grid_size[py];
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s->grid_size[py] = nx;
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s->grid_data[py] = xrealloc(s->grid_data[py], 1, nx);
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memset(&s->grid_data[py][ox], SCREEN_DEFDATA, nx - ox);
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s->grid_attr[py] = xrealloc(s->grid_attr[py], 1, nx);
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memset(&s->grid_attr[py][ox], SCREEN_DEFATTR, nx - ox);
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s->grid_colr[py] = xrealloc(s->grid_colr[py], 1, nx);
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memset(&s->grid_colr[py][ox], SCREEN_DEFCOLR, nx - ox);
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}
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/* Reduce line. */
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void
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screen_reduce_line(struct screen *s, u_int py, u_int nx)
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{
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s->grid_size[py] = nx;
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s->grid_data[py] = xrealloc(s->grid_data[py], 1, nx);
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s->grid_attr[py] = xrealloc(s->grid_attr[py], 1, nx);
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s->grid_colr[py] = xrealloc(s->grid_colr[py], 1, nx);
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}
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/* Get cell. */
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void
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screen_get_cell(struct screen *s,
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u_int cx, u_int cy, u_char *data, u_char *attr, u_char *colr)
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{
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if (cx >= s->grid_size[cy]) {
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*data = SCREEN_DEFDATA;
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*attr = SCREEN_DEFATTR;
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*colr = SCREEN_DEFCOLR;
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} else {
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*data = s->grid_data[cy][cx];
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*attr = s->grid_attr[cy][cx];
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*colr = s->grid_colr[cy][cx];
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}
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if (screen_check_selection(s, cx, cy))
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*attr |= ATTR_REVERSE;
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}
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/* Set a cell. */
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void
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screen_set_cell(struct screen *s,
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u_int cx, u_int cy, u_char data, u_char attr, u_char colr)
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{
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if (cx >= s->grid_size[cy]) {
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if (data == SCREEN_DEFDATA &&
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attr == SCREEN_DEFATTR &&
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colr == SCREEN_DEFCOLR)
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return;
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screen_expand_line(s, cy, cx + 1);
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}
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s->grid_data[cy][cx] = data;
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s->grid_attr[cy][cx] = attr;
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s->grid_colr[cy][cx] = colr;
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}
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/* Destroy a screen. */
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void
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screen_destroy(struct screen *s)
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{
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xfree(s->title);
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screen_free_lines(s, 0, s->dy + s->hsize);
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xfree(s->grid_data);
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xfree(s->grid_attr);
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xfree(s->grid_colr);
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xfree(s->grid_size);
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}
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/* Create a range of lines. */
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void
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screen_make_lines(struct screen *s, u_int py, u_int ny)
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{
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u_int i;
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for (i = py; i < py + ny; i++) {
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s->grid_data[i] = NULL;
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s->grid_attr[i] = NULL;
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s->grid_colr[i] = NULL;
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s->grid_size[i] = 0;
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}
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}
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/* Free a range of ny lines at py. */
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void
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screen_free_lines(struct screen *s, u_int py, u_int ny)
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{
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u_int i;
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for (i = py; i < py + ny; i++) {
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if (s->grid_data[i] != NULL)
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xfree(s->grid_data[i]);
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s->grid_data[i] = NULL;
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if (s->grid_attr[i] != NULL)
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xfree(s->grid_attr[i]);
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s->grid_attr[i] = NULL;
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if (s->grid_colr[i] != NULL)
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xfree(s->grid_colr[i]);
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s->grid_colr[i] = NULL;
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s->grid_size[i] = 0;
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}
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}
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/* Move a range of lines. */
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void
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screen_move_lines(struct screen *s, u_int dy, u_int py, u_int ny)
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{
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memmove(
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&s->grid_data[dy], &s->grid_data[py], ny * (sizeof *s->grid_data));
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memmove(
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&s->grid_attr[dy], &s->grid_attr[py], ny * (sizeof *s->grid_attr));
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memmove(
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&s->grid_colr[dy], &s->grid_colr[py], ny * (sizeof *s->grid_colr));
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memmove(
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&s->grid_size[dy], &s->grid_size[py], ny * (sizeof *s->grid_size));
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}
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/* Fill an area. */
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void
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screen_fill_area(struct screen *s, u_int px, u_int py,
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u_int nx, u_int ny, u_char data, u_char attr, u_char colr)
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{
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u_int i, j;
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for (i = py; i < py + ny; i++) {
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for (j = px; j < px + nx; j++)
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screen_set_cell(s, j, i, data, attr, colr);
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}
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}
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/* Set selection. */
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void
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screen_set_selection(struct screen *s, u_int sx, u_int sy, u_int ex, u_int ey)
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{
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struct screen_sel *sel = &s->sel;
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sel->flag = 1;
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if (ey < sy || (sy == ey && ex < sx)) {
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sel->sx = ex; sel->sy = ey;
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sel->ex = sx; sel->ey = sy;
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} else {
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sel->sx = sx; sel->sy = sy;
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sel->ex = ex; sel->ey = ey;
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}
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}
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/* Clear selection. */
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void
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screen_clear_selection(struct screen *s)
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{
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struct screen_sel *sel = &s->sel;
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sel->flag = 0;
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}
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/* Check if cell in selection. */
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int
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screen_check_selection(struct screen *s, u_int px, u_int py)
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{
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struct screen_sel *sel = &s->sel;
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if (!sel->flag || py < sel->sy || py > sel->ey)
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return (0);
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if (py == sel->sy && py == sel->ey) {
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if (px < sel->sx || px > sel->ex)
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return (0);
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return (1);
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}
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if ((py == sel->sy && px < sel->sx) || (py == sel->ey && px > sel->ex))
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return (0);
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return (1);
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}
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