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Member "xterm-379/linedata.c" (18 Sep 2022, 8573 Bytes) of package /linux/misc/xterm-379.tgz:

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    1 /* $XTermId: linedata.c,v 1.102 2022/09/18 21:17:43 tom Exp $ */
    2 
    3 /*
    4  * Copyright 2009-2021,2022 by Thomas E. Dickey
    5  *
    6  *                         All Rights Reserved
    7  *
    8  * Permission is hereby granted, free of charge, to any person obtaining a
    9  * copy of this software and associated documentation files (the
   10  * "Software"), to deal in the Software without restriction, including
   11  * without limitation the rights to use, copy, modify, merge, publish,
   12  * distribute, sublicense, and/or sell copies of the Software, and to
   13  * permit persons to whom the Software is furnished to do so, subject to
   14  * the following conditions:
   15  *
   16  * The above copyright notice and this permission notice shall be included
   17  * in all copies or substantial portions of the Software.
   18  *
   19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
   20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
   21  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
   22  * IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
   23  * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
   24  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
   25  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
   26  *
   27  * Except as contained in this notice, the name(s) of the above copyright
   28  * holders shall not be used in advertising or otherwise to promote the
   29  * sale, use or other dealings in this Software without prior written
   30  * authorization.
   31  */
   32 
   33 #include <xterm.h>
   34 #include <data.h>
   35 
   36 #include <assert.h>
   37 
   38 /*
   39  * Given a row-number, find the corresponding data for the line in the VT100
   40  * widget.  Row numbers can be positive or negative.
   41  *
   42  * If the data comes from the scrollback, defer that to getScrollback().
   43  */
   44 LineData *
   45 getLineData(TScreen *screen, int row)
   46 {
   47     LineData *result = 0;
   48     ScrnBuf buffer;
   49     int max_row = LastRowNumber(screen);
   50 
   51     if (row >= 0) {
   52     buffer = screen->visbuf;
   53     } else {
   54     buffer = 0;
   55     result = getScrollback(screen, row);
   56     }
   57     if (row >= 0 && row <= max_row) {
   58     result = (LineData *) scrnHeadAddr(screen, buffer, (unsigned) row);
   59     }
   60 
   61     return result;
   62 }
   63 
   64 /*
   65  * Copy line's data, e.g., from one screen buffer to another, given the preset
   66  * pointers for the destination.
   67  *
   68  * TODO: optionally prune unused combining character data from the result.
   69  */
   70 void
   71 copyLineData(LineData *dst, CLineData *src)
   72 {
   73     if (dst == NULL || src == NULL || dst == src)
   74     return;
   75 
   76     dst->bufHead = src->bufHead;
   77 
   78 #if OPT_WIDE_CHARS
   79     dst->combSize = src->combSize;
   80 #endif
   81 
   82     /*
   83      * Usually we're copying the same-sized line; a memcpy is faster than
   84      * several loops.
   85      */
   86     if (dst->lineSize == src->lineSize) {
   87     size_t size = (sizeof(dst->attribs[0])
   88 #if OPT_ISO_COLORS
   89                + sizeof(dst->color[0])
   90 #endif
   91                + sizeof(dst->charData[0])
   92 #if OPT_WIDE_CHARS
   93                + sizeof(dst->combData[0][0]) * dst->combSize
   94 #endif
   95     );
   96 
   97     memcpy(dst->attribs, src->attribs, size * dst->lineSize);
   98     } else {
   99     Dimension col;
  100     Dimension limit = ((dst->lineSize < src->lineSize)
  101                ? dst->lineSize
  102                : src->lineSize);
  103 #if OPT_WIDE_CHARS
  104     Char comb;
  105 #endif
  106 
  107     for (col = 0; col < limit; ++col) {
  108         dst->attribs[col] = src->attribs[col];
  109 #if OPT_ISO_COLORS
  110         dst->color[col] = src->color[col];
  111 #endif
  112         dst->charData[col] = src->charData[col];
  113 #if OPT_WIDE_CHARS
  114         for (comb = 0; comb < dst->combSize; ++comb) {
  115         dst->combData[comb][col] = src->combData[comb][col];
  116         }
  117 #endif
  118     }
  119     for (col = limit; col < dst->lineSize; ++col) {
  120         dst->attribs[col] = 0;
  121 #if OPT_ISO_COLORS
  122         dst->color[col] = initCColor;
  123 #endif
  124         dst->charData[col] = 0;
  125 #if OPT_WIDE_CHARS
  126         for (comb = 0; comb < dst->combSize; ++comb) {
  127         dst->combData[comb][col] = 0;
  128         }
  129 #endif
  130     }
  131     }
  132 }
  133 
  134 #if OPT_WIDE_CHARS
  135 #define initLineExtra(screen) \
  136     screen->lineExtra = ((size_t) (screen->max_combining) * sizeof(IChar *)); \
  137     screen->cellExtra = ((size_t) (screen->max_combining) * sizeof(IChar))
  138 #else
  139 #define initLineExtra(screen) \
  140     screen->lineExtra = 0; \
  141     screen->cellExtra = 0
  142 #endif
  143 
  144 /*
  145  * CellData size depends on the "combiningChars" resource.
  146  */
  147 #define CellDataSize(screen) (SizeOfCellData + screen->cellExtra)
  148 
  149 #define CellDataAddr(screen, data, cell) \
  150     ( (CellData *)(void *) ((char *)data + (cell * CellDataSize(screen))) )
  151 #define ConstCellDataAddr(screen, data, cell) \
  152     ( (const CellData *)(const void *) ( \
  153           (const char *)data + (cell * CellDataSize(screen))) )
  154 
  155 void
  156 initLineData(XtermWidget xw)
  157 {
  158     TScreen *screen = TScreenOf(xw);
  159 
  160     initLineExtra(screen);
  161 
  162 #if OPT_WIDE_CHARS
  163     TRACE(("initLineData %lu (%d combining chars)\n",
  164        (unsigned long) screen->lineExtra, screen->max_combining));
  165 #else
  166     TRACE(("initLineData\n"));
  167 #endif
  168 
  169     /*
  170      * Per-line size/offsets.
  171      */
  172     TRACE(("** sizeof(LineData)  %lu\n", (unsigned long) sizeof(LineData)));
  173     TRACE(("   offset(lineSize)  %lu\n", (unsigned long) offsetof(LineData, lineSize)));
  174     TRACE(("   offset(bufHead)   %lu\n", (unsigned long) offsetof(LineData, bufHead)));
  175 #if OPT_WIDE_CHARS
  176     TRACE(("   offset(combSize)  %lu\n", (unsigned long) offsetof(LineData, combSize)));
  177 #endif
  178     TRACE(("   offset(*attribs)  %lu\n", (unsigned long) offsetof(LineData, attribs)));
  179 #if OPT_ISO_COLORS
  180     TRACE(("   offset(*color)    %lu\n", (unsigned long) offsetof(LineData, color)));
  181 #endif
  182     TRACE(("   offset(*charData) %lu\n", (unsigned long) offsetof(LineData, charData)));
  183     TRACE(("   offset(*combData) %lu\n", (unsigned long) offsetof(LineData, combData)));
  184 
  185     /*
  186      * Per-cell size/offsets.
  187      */
  188     TRACE(("** sizeof(CellData)  %lu\n", (unsigned long) CellDataSize(screen)));
  189     TRACE(("   offset(attribs)   %lu\n", (unsigned long) offsetof(CellData, attribs)));
  190 #if OPT_WIDE_CHARS
  191     TRACE(("   offset(combSize)  %lu\n", (unsigned long) offsetof(CellData, combSize)));
  192 #endif
  193 #if OPT_ISO_COLORS
  194     TRACE(("   offset(color)     %lu\n", (unsigned long) offsetof(CellData, color)));
  195 #endif
  196     TRACE(("   offset(charData)  %lu\n", (unsigned long) offsetof(CellData, charData)));
  197     TRACE(("   offset(combData)  %lu\n", (unsigned long) offsetof(CellData, combData)));
  198 
  199     /*
  200      * Data-type sizes.
  201      */
  202 #if OPT_ISO_COLORS
  203     TRACE(("** sizeof(CellColor) %lu\n", (unsigned long) sizeof(CellColor)));
  204 #endif
  205     TRACE(("** sizeof(IAttr)     %lu\n", (unsigned long) sizeof(IAttr)));
  206     TRACE(("** sizeof(IChar)     %lu\n", (unsigned long) sizeof(IChar)));
  207     TRACE(("** sizeof(RowData)   %lu\n", (unsigned long) sizeof(RowData)));
  208 }
  209 
  210 CellData *
  211 newCellData(XtermWidget xw, Cardinal count)
  212 {
  213     CellData *result;
  214     TScreen *screen = TScreenOf(xw);
  215 
  216     initLineExtra(screen);
  217     result = (CellData *) calloc((size_t) count, (size_t) CellDataSize(screen));
  218     return result;
  219 }
  220 
  221 void
  222 saveCellData(TScreen *screen,
  223          CellData *data,
  224          Cardinal cell,
  225          CLineData *ld,
  226          XTermRect *limits,
  227          int column)
  228 {
  229     CellData *item = CellDataAddr(screen, data, cell);
  230 
  231     (void) limits;
  232     if (column < MaxCols(screen)) {
  233     item->attribs = ld->attribs[column];
  234     if_OPT_ISO_COLORS(screen, {
  235         item->color = ld->color[column];
  236     });
  237     item->charData = ld->charData[column];
  238     if_OPT_WIDE_CHARS(screen, {
  239         size_t off;
  240         Bool blank = (((item->charData == HIDDEN_CHAR)
  241                && (limits == NULL
  242                    || (column + 1) == limits->left))
  243               || (item->charData != HIDDEN_CHAR
  244                   && WideCells(item->charData) > 1
  245                   && (limits == NULL
  246                   || (column + 1) >= limits->right)));
  247         if (blank) {
  248         item->charData = (CharData) ' ';
  249         }
  250         item->combSize = blank ? 0 : ld->combSize;
  251         for_each_combData(off, item) {
  252         item->combData[off] = ld->combData[off][column];
  253         }
  254     });
  255     TRACE2(("SAVED::%s\n", visibleIChars(&(item->charData), 1)));
  256     }
  257 }
  258 
  259 void
  260 restoreCellData(TScreen *screen,
  261         const CellData *data,
  262         Cardinal cell,
  263         LineData *ld,
  264         XTermRect *limits,
  265         int column)
  266 {
  267     const CellData *item = ConstCellDataAddr(screen, data, cell);
  268 
  269     (void) limits;
  270     if (column < MaxCols(screen)) {
  271     ld->attribs[column] = item->attribs;
  272     TRACE2(("BEFORE:%2d:%s\n", column + 1, visibleIChars(ld->charData, ld->lineSize)));
  273     if_OPT_ISO_COLORS(screen, {
  274         ld->color[column] = item->color;
  275     });
  276     ld->charData[column] = item->charData;
  277     if_OPT_WIDE_CHARS(screen, {
  278         size_t off;
  279         ld->combSize = item->combSize;
  280         for_each_combData(off, ld) {
  281         ld->combData[off][column] = item->combData[off];
  282         }
  283     });
  284     TRACE2(("AFTER::%2d:%s\n", column + 1, visibleIChars(ld->charData, ld->lineSize)));
  285     }
  286 }