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/* $XTermId: testxmc.c,v 1.48 2011/09/11 14:59:40 tom Exp $ */
/*
* Copyright 1997-2010,2011 by Thomas E. Dickey
*
* All Rights Reserved
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* Except as contained in this notice, the name(s) of the above copyright
* holders shall not be used in advertising or otherwise to promote the
* sale, use or other dealings in this Software without prior written
* authorization.
*/
/*
* This module provides test support for curses applications that must work
* with terminals that have the xmc (magic cookie) glitch. The xmc_glitch
* resource denotes the number of spaces that are emitted when switching to or
* from standout (reverse) mode. Some terminals implement this by storing the
* attribute controls in the character cell that is skipped. So if the cell is
* overwritten by text, then the attribute change in the cell is cancelled,
* causing attributes to the left of the change to propagate.
*
* We implement the glitch by writing a character that won't be mistaken for
* other normal characters (and mapping normal writes to that character to a
* different one).
*
* Since xmc isn't normally part of xterm, we document it here rather than in
* the man-page. This module is driven by resources rather than by the
* termcap/terminfo description to make it a little more flexible for testing
* purposes.
*
* Resources:
*
* xmcGlitch (class XmcGlitch)
* When true, enables this extension. The default is `0', which disables
* the module. (termcap sg, terminfo xmc).
*
* xmcAttributes (class XmcAttributes)
* The attributes for which we'll generate a glitch, as a bitmask.
*
* INVERSE 1
* UNDERLINE 2
* BOLD 4
* BLINK 8
*
* The default is `1' (INVERSE). Some terminals emit glitches for
* underline. Just for completeness, we recognize all of the video
* attributes.
*
* xmcInline (class XmcInline)
* When true, limits the extent of an SGR change to the current line.
* The default is `false'. (No termcap or terminfo equivalent, though
* there are comments in some entries relating to this issue).
*
* xmcMoveSGR (class XmcMoveSGR)
* When false, a cursor movement will leave a glitch when SGR's are
* active. The default is `true'. (termcap ms, terminfo msgr).
*
* TODO:
* When xmc is active, the terminfo max_attributes (ma) capability is
* assumed to be 1.
*
* The xmcAttributes resource should also apply to alternate character
* sets and to color.
*/
#include <xterm.h>
#include <data.h>
#define MARK_ON(a) (Bool) ((my_attrs & a) != 0 && (xw->flags & (whichone = CharOf(a))) == 0)
#define MARK_OFF(a) (Bool) ((my_attrs & a) != 0 && (xw->flags & (whichone = CharOf(a))) != 0)
void
Mark_XMC(XtermWidget xw, int param)
{
static IChar *glitch;
TScreen *screen = TScreenOf(xw);
Bool found = False;
unsigned my_attrs = CharOf(screen->xmc_attributes & XMC_FLAGS);
unsigned whichone = 0;
if (glitch == 0) {
unsigned len = screen->xmc_glitch;
glitch = TypeMallocN(IChar, len);
while (len--)
glitch[len] = XMC_GLITCH;
}
switch (param) {
case -1: /* DEFAULT */
case 0: /* FALLTHRU */
found = MARK_OFF((xw->flags & XMC_FLAGS));
break;
case 1:
found = MARK_ON(BOLD);
break;
case 4:
found = MARK_ON(UNDERLINE);
break;
case 5:
found = MARK_ON(BLINK);
break;
case 7:
found = MARK_ON(INVERSE);
break;
case 22:
found = MARK_OFF(BOLD);
break;
case 24:
found = MARK_OFF(UNDERLINE);
break;
case 25:
found = MARK_OFF(BLINK);
break;
case 27:
found = MARK_OFF(INVERSE);
break;
}
/*
* Write a glitch with the attributes temporarily set to the new(er)
* ones.
*/
if (found) {
unsigned save = xw->flags;
xw->flags ^= whichone;
TRACE(("XMC Writing glitch (%d/%d) after SGR %d\n", my_attrs,
whichone, param));
dotext(xw, '?', glitch, screen->xmc_glitch);
xw->flags = save;
}
}
/*
* Force a glitch on cursor movement when we're in standout mode and not at the
* end of a line.
*/
void
Jump_XMC(XtermWidget xw)
{
TScreen *screen = TScreenOf(xw);
if (!screen->move_sgr_ok
&& screen->cur_col <= LineMaxCol(screen,
getLineData(screen, screen->cur_row))) {
Mark_XMC(xw, -1);
}
}
/*
* After writing text to the screen, resolve mismatch between the current
* location and any attributes that would have been set by preceding locations.
*/
void
Resolve_XMC(XtermWidget xw)
{
TScreen *screen = TScreenOf(xw);
LineData *ld;
Bool changed = False;
Char start;
Char my_attrs = CharOf(screen->xmc_attributes & XMC_FLAGS);
int row = screen->cur_row;
int col = screen->cur_col;
/* Find the preceding cell.
*/
ld = getLineData(screen, row);
if (ld->charData[col] != XMC_GLITCH) {
if (col != 0) {
col--;
} else if (!screen->xmc_inline && row != 0) {
ld = getLineData(screen, --row);
col = LineMaxCol(screen, ld);
}
}
start = (ld->attribs[col] & my_attrs);
/* Now propagate the starting state until we reach a cell which holds
* a glitch.
*/
for (;;) {
if (col < LineMaxCol(screen, ld)) {
col++;
} else if (!screen->xmc_inline && row < screen->max_row) {
col = 0;
ld = getLineData(screen, ++row);
} else
break;
if (ld->charData[col] == XMC_GLITCH)
break;
if ((ld->attribs[col] & my_attrs) != start) {
ld->attribs[col] =
CharOf(start | (ld->attribs[col] & ~my_attrs));
changed = True;
}
}
TRACE(("XMC %s (%s:%d/%d) from %d,%d to %d,%d\n",
changed ? "Ripple" : "Nochange",
BtoS(xw->flags & my_attrs),
my_attrs, start,
screen->cur_row, screen->cur_col,
row, col));
if (changed) {
ScrnUpdate(xw, screen->cur_row, 0, row + 1 - screen->cur_row,
MaxCols(screen), True);
}
}
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