228 lines
6.7 KiB
C
228 lines
6.7 KiB
C
/* $XTermId: testxmc.c,v 1.52 2014/05/11 14:05:38 tom Exp $ */
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/*
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* Copyright 1997-2011,2014 by Thomas E. Dickey
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*
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* All Rights Reserved
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* Except as contained in this notice, the name(s) of the above copyright
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* holders shall not be used in advertising or otherwise to promote the
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* sale, use or other dealings in this Software without prior written
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* authorization.
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*/
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/*
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* This module provides test support for curses applications that must work
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* with terminals that have the xmc (magic cookie) glitch. The xmc_glitch
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* resource denotes the number of spaces that are emitted when switching to or
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* from standout (reverse) mode. Some terminals implement this by storing the
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* attribute controls in the character cell that is skipped. So if the cell is
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* overwritten by text, then the attribute change in the cell is cancelled,
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* causing attributes to the left of the change to propagate.
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*
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* We implement the glitch by writing a character that won't be mistaken for
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* other normal characters (and mapping normal writes to that character to a
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* different one).
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*
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* Since xmc isn't normally part of xterm, we document it here rather than in
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* the man-page. This module is driven by resources rather than by the
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* termcap/terminfo description to make it a little more flexible for testing
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* purposes.
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*
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* Resources:
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*
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* xmcGlitch (class XmcGlitch)
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* When true, enables this extension. The default is `0', which disables
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* the module. (termcap sg, terminfo xmc).
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*
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* xmcAttributes (class XmcAttributes)
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* The attributes for which we'll generate a glitch, as a bitmask.
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*
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* INVERSE 1
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* UNDERLINE 2
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* BOLD 4
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* BLINK 8
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*
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* The default is `1' (INVERSE). Some terminals emit glitches for
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* underline. Just for completeness, we recognize all of the video
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* attributes.
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*
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* xmcInline (class XmcInline)
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* When true, limits the extent of an SGR change to the current line.
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* The default is `false'. (No termcap or terminfo equivalent, though
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* there are comments in some entries relating to this issue).
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*
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* xmcMoveSGR (class XmcMoveSGR)
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* When false, a cursor movement will leave a glitch when SGR's are
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* active. The default is `true'. (termcap ms, terminfo msgr).
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*
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* TODO:
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* When xmc is active, the terminfo max_attributes (ma) capability is
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* assumed to be 1.
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*
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* The xmcAttributes resource should also apply to alternate character
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* sets and to color.
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*/
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#include <xterm.h>
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#include <data.h>
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#define MARK_ON(a) (Bool) ((my_attrs & a) != 0 && (xw->flags & (whichone = CharOf(a))) == 0)
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#define MARK_OFF(a) (Bool) ((my_attrs & a) != 0 && (xw->flags & (whichone = CharOf(a))) != 0)
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void
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Mark_XMC(XtermWidget xw, int param)
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{
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static IChar *glitch;
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TScreen *screen = TScreenOf(xw);
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Bool found = False;
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unsigned my_attrs = CharOf(screen->xmc_attributes & XMC_FLAGS);
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unsigned whichone = 0;
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if (glitch == 0) {
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unsigned len = screen->xmc_glitch;
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glitch = TypeMallocN(IChar, len);
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while (len--)
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glitch[len] = XMC_GLITCH;
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}
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switch (param) {
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case -1: /* DEFAULT */
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case 0: /* FALLTHRU */
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found = MARK_OFF((xw->flags & XMC_FLAGS));
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break;
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case 1:
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found = MARK_ON(BOLD);
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break;
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case 4:
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found = MARK_ON(UNDERLINE);
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break;
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case 5:
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found = MARK_ON(BLINK);
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break;
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case 7:
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found = MARK_ON(INVERSE);
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break;
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case 22:
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found = MARK_OFF(BOLD);
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break;
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case 24:
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found = MARK_OFF(UNDERLINE);
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break;
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case 25:
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found = MARK_OFF(BLINK);
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break;
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case 27:
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found = MARK_OFF(INVERSE);
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break;
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}
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/*
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* Write a glitch with the attributes temporarily set to the new(er)
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* ones.
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*/
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if (found) {
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unsigned save = xw->flags;
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xw->flags ^= whichone;
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TRACE(("XMC Writing glitch (%d/%d) after SGR %d\n", my_attrs,
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whichone, param));
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dotext(xw, '?', glitch, screen->xmc_glitch);
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xw->flags = save;
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}
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}
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/*
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* Force a glitch on cursor movement when we're in standout mode and not at the
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* end of a line.
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*/
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void
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Jump_XMC(XtermWidget xw)
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{
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TScreen *screen = TScreenOf(xw);
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if (!screen->move_sgr_ok
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&& screen->cur_col <= LineMaxCol(screen,
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getLineData(screen, screen->cur_row))) {
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Mark_XMC(xw, -1);
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}
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}
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/*
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* After writing text to the screen, resolve mismatch between the current
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* location and any attributes that would have been set by preceding locations.
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*/
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void
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Resolve_XMC(XtermWidget xw)
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{
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TScreen *screen = TScreenOf(xw);
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LineData *ld;
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Bool changed = False;
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IAttr start;
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IAttr my_attrs = CharOf(screen->xmc_attributes & XMC_FLAGS);
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int row = screen->cur_row;
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int col = screen->cur_col;
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/* Find the preceding cell.
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*/
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ld = getLineData(screen, row);
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if (ld->charData[col] != XMC_GLITCH) {
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if (col != 0) {
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col--;
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} else if (!screen->xmc_inline && row != 0) {
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ld = getLineData(screen, --row);
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col = LineMaxCol(screen, ld);
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}
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}
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start = (ld->attribs[col] & my_attrs);
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/* Now propagate the starting state until we reach a cell which holds
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* a glitch.
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*/
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for (;;) {
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if (col < LineMaxCol(screen, ld)) {
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col++;
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} else if (!screen->xmc_inline && row < screen->max_row) {
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col = 0;
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ld = getLineData(screen, ++row);
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} else
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break;
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if (ld->charData[col] == XMC_GLITCH)
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break;
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if ((ld->attribs[col] & my_attrs) != start) {
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ld->attribs[col] =
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(IAttr) (start | (ld->attribs[col] & ~my_attrs));
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changed = True;
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}
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}
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TRACE(("XMC %s (%s:%d/%d) from %d,%d to %d,%d\n",
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changed ? "Ripple" : "Nochange",
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BtoS(xw->flags & my_attrs),
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my_attrs, start,
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screen->cur_row, screen->cur_col,
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row, col));
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if (changed) {
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ScrnUpdate(xw, screen->cur_row, 0, row + 1 - screen->cur_row,
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MaxCols(screen), True);
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}
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}
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