objects/text.c

   1 /*
   2  * text functions
   3  *
   4  * Copyright 1993 Alexandre Julliard
   5  */
   6
   7 static char Copyright[] = "Copyright  Alexandre Julliard, 1993";
   8
   9 #include <X11/Xatom.h>
  10
  11 #include "gdi.h"
  12
  13 #define TAB     9
  14 #define LF     10
  15 #define CR     13
  16 #define SPACE  32
  17 #define PREFIX 38
  18
  19 static int tabstop = 8;
  20 static int tabwidth;
  21 static int spacewidth;
  22 static int prefix_offset;
  23
  24
  25 static char *TEXT_NextLine(HDC hdc, char *str, int *count, char *dest,
  26                            int *len, int width, WORD format)
  27 {
  28     /* Return next line of text from a string.
  29      *
  30      * hdc - handle to DC.
  31      * str - string to parse into lines.
  32      * count - length of str.
  33      * dest - destination in which to return line.
  34      * len - length of resultant line in dest in chars.
  35      * width - maximum width of line in pixels.
  36      * format - format type passed to DrawText.
  37      *
  38      * Returns pointer to next char in str after end of the line
  39      * or NULL if end of str reached.
  40      */
  41
  42     int i = 0, j = 0, k;
  43     int plen = 0;
  44     int numspaces;
  45     SIZE size;
  46     int lasttab = 0;
  47     int wb_i = 0, wb_j = 0, wb_count;
  48
  49     while (*count)
  50     {
  51         switch (str[i])
  52         {
  53         case CR:
  54         case LF:
  55             if (!(format & DT_SINGLELINE))
  56             {
  57                 i++;
  58                 if (str[i] == CR || str[i] == LF)
  59                     i++;
  60                 *len = j;
  61                 return (&str[i]);
  62             }
  63             dest[j++] = str[i++];
  64             if (!(format & DT_NOCLIP) || !(format & DT_NOPREFIX))
  65             {
  66                 if (!GetTextExtentPoint(hdc, &dest[j-1], 1, &size))
  67                     return NULL;
  68                 plen += size.cx;
  69             }
  70             break;
  71
  72         case PREFIX:
  73             if (!(format & DT_NOPREFIX))
  74             {
  75                 prefix_offset = j + 1;
  76                 i++;
  77             }
  78             else
  79             {
  80                 dest[j++] = str[i++];
  81                 if (!(format & DT_NOCLIP))
  82                 {
  83                     if (!GetTextExtentPoint(hdc, &dest[j-1], 1, &size))
  84                         return NULL;
  85                     plen += size.cx;
  86                 }
  87             }
  88             break;
  89
  90         case TAB:
  91             if (format & DT_EXPANDTABS)
  92             {
  93                 wb_i = ++i;
  94                 wb_j = j;
  95                 wb_count = *count;
  96
  97                 if (!GetTextExtentPoint(hdc, &dest[lasttab], j - lasttab,
  98                                                                  &size))
  99                     return NULL;
 100
 101                 numspaces = (tabwidth - size.cx) / spacewidth;
 102                 for (k = 0; k < numspaces; k++)
 103                     dest[j++] = SPACE;
 104                 plen += tabwidth - size.cx;
 105                 lasttab = wb_j + numspaces;
 106             }
 107             else
 108             {
 109                 dest[j++] = str[i++];
 110                 if (!(format & DT_NOCLIP) || !(format & DT_NOPREFIX))
 111                 {
 112                     if (!GetTextExtentPoint(hdc, &dest[j-1], 1, &size))
 113                         return NULL;
 114                     plen += size.cx;
 115                 }
 116             }
 117             break;
 118
 119         case SPACE:
 120             dest[j++] = str[i++];
 121             if (!(format & DT_NOCLIP) || !(format & DT_NOPREFIX))
 122             {
 123                 wb_i = i;
 124                 wb_j = j - 1;
 125                 wb_count = *count;
 126                 if (!GetTextExtentPoint(hdc, &dest[j-1], 1, &size))
 127                     return NULL;
 128                 plen += size.cx;
 129             }
 130             break;
 131
 132         default:
 133             dest[j++] = str[i++];
 134             if (!(format & DT_NOCLIP) || !(format & DT_NOPREFIX))
 135             {
 136                 if (!GetTextExtentPoint(hdc, &dest[j-1], 1, &size))
 137                     return NULL;
 138                 plen += size.cx;
 139             }
 140         }
 141
 142         (*count)--;
 143         if (!(format & DT_NOCLIP) || (format & DT_WORDBREAK))
 144         {
 145             if (plen > width)
 146             {
 147                 if (format & DT_WORDBREAK)
 148                 {
 149                     *len = wb_j;
 150                     *count = wb_count;
 151                     return (&str[wb_i]);
 152                 }
 153                 else
 154                 {
 155                     *len = j;
 156                     return (&str[i]);
 157                 }
 158             }
 159         }
 160     }
 161
 162     *len = j;
 163     return NULL;
 164 }
 165
 166
 167 /***********************************************************************
 168  *           DrawText    (USER.85)
 169  */
 170 int DrawText( HDC hdc, LPSTR str, int count, LPRECT rect, WORD flags )
 171 {
 172     SIZE size;
 173     char *strPtr;
 174     static char line[1024];
 175     int len, lh, prefix_x, prefix_len;
 176     TEXTMETRIC tm;
 177     int x = rect->left, y = rect->top;
 178     int width = rect->right - rect->left;
 179
 180     if (count == -1) count = strlen(str);
 181     strPtr = str;
 182
 183     GetTextMetrics(hdc, &tm);
 184     if (flags & DT_EXTERNALLEADING)
 185         lh = tm.tmHeight + tm.tmExternalLeading;
 186     else
 187         lh = tm.tmHeight;
 188
 189     if (flags & DT_TABSTOP)
 190         tabstop = flags >> 8;
 191
 192     if (flags & DT_EXPANDTABS)
 193     {
 194         GetTextExtentPoint(hdc, " ", 1, &size);
 195         spacewidth = size.cx;
 196         GetTextExtentPoint(hdc, "o", 1, &size);
 197         tabwidth = size.cx * tabstop;
 198     }
 199
 200     do
 201     {
 202         prefix_offset = -1;
 203         strPtr = TEXT_NextLine(hdc, strPtr, &count, line, &len, width, flags);
 204
 205         if (prefix_offset != -1)
 206         {
 207             GetTextExtentPoint(hdc, line, prefix_offset - 1, &size);
 208             prefix_x = size.cx;
 209             GetTextExtentPoint(hdc, line + prefix_offset, 1, &size);
 210             prefix_len = size.cx;
 211         }
 212
 213         if (!GetTextExtentPoint(hdc, line, len, &size)) return 0;
 214         if (flags & DT_CENTER) x = (rect->left + rect->right -
 215                                     size.cx) / 2;
 216         else if (flags & DT_RIGHT) x = rect->right - size.cx;
 217
 218         if (flags & DT_SINGLELINE)
 219         {
 220             if (flags & DT_VCENTER) y = rect->top +
 221                 (rect->bottom - rect->top) / 2 - size.cy / 2;
 222             else if (flags & DT_BOTTOM) y = rect->bottom - size.cy;
 223         }
 224         if (!(flags & DT_CALCRECT))
 225             if (!TextOut(hdc, x, y, line, len)) return 0;
 226         if (prefix_offset != -1)
 227         {
 228             MoveTo(hdc, x + prefix_x, y + size.cy);
 229             LineTo(hdc, x + prefix_x + prefix_len, y + size.cy);
 230         }
 231
 232         if (strPtr)
 233         {
 234             y += lh;
 235             if (!(flags & DT_NOCLIP))
 236             {
 237                 if (y > rect->bottom - lh)
 238                     break;
 239             }
 240         }
 241     }
 242     while (strPtr);
 243     if (flags & DT_CALCRECT) rect->bottom = y;
 244     return 1;
 245 }
 246
 247
 248 /***********************************************************************
 249  *           TextOut    (GDI.33)
 250  */
 251 BOOL TextOut( HDC hdc, short x, short y, LPSTR str, short count )
 252 {
 253     int dir, ascent, descent, i;
 254     XCharStruct info;
 255     XFontStruct *font;
 256
 257     DC * dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
 258     if (!dc) return FALSE;
 259     if (!DC_SetupGCForText( dc )) return TRUE;
 260     font = dc->u.x.font.fstruct;
 261
 262     if (dc->w.textAlign & TA_UPDATECP)
 263     {
 264         x = dc->w.CursPosX;
 265         y = dc->w.CursPosY;
 266     }
 267 #ifdef DEBUG_TEXT
 268     printf( "TextOut: %d,%d '%s'\n", x, y, str );
 269 #endif
 270     x = XLPTODP( dc, x );
 271     y = YLPTODP( dc, y );
 272
 273     XTextExtents( font, str, count, &dir, &ascent, &descent, &info );
 274     info.width += count*dc->w.charExtra + dc->w.breakExtra*dc->w.breakCount;
 275
 276       /* Compute starting position */
 277
 278     switch( dc->w.textAlign & (TA_LEFT | TA_RIGHT | TA_CENTER) )
 279     {
 280       case TA_LEFT:
 281           if (dc->w.textAlign & TA_UPDATECP)
 282               dc->w.CursPosX = XDPTOLP( dc, x + info.width );
 283           break;
 284       case TA_RIGHT:
 285           x -= info.width;
 286           if (dc->w.textAlign & TA_UPDATECP) dc->w.CursPosX = XDPTOLP( dc, x );
 287           break;
 288       case TA_CENTER:
 289           x -= info.width / 2;
 290           break;
 291     }
 292     switch( dc->w.textAlign & (TA_TOP | TA_BOTTOM | TA_BASELINE) )
 293     {
 294       case TA_TOP:
 295           y += font->ascent;
 296           break;
 297       case TA_BOTTOM:
 298           y -= font->descent;
 299           break;
 300       case TA_BASELINE:
 301           break;
 302     }
 303
 304       /* Draw text */
 305
 306     if (!dc->w.charExtra && !dc->w.breakExtra)
 307     {
 308         if (dc->w.backgroundMode == TRANSPARENT)
 309             XDrawString( XT_display, dc->u.x.drawable, dc->u.x.gc,
 310                          dc->w.DCOrgX + x, dc->w.DCOrgY + y, str, count );
 311         else
 312             XDrawImageString( XT_display, dc->u.x.drawable, dc->u.x.gc,
 313                               dc->w.DCOrgX + x, dc->w.DCOrgY + y, str, count );
 314     }
 315     else
 316     {
 317         char * p = str;
 318         int xchar = x;
 319         for (i = 0; i < count; i++, p++)
 320         {
 321             XCharStruct * charStr;
 322             unsigned char ch = *p;
 323             int extraWidth;
 324
 325             if ((ch < font->min_char_or_byte2)||(ch > font->max_char_or_byte2))
 326                 ch = font->default_char;
 327             if (!font->per_char) charStr = &font->min_bounds;
 328             else charStr = font->per_char + ch - font->min_char_or_byte2;
 329
 330             extraWidth = dc->w.charExtra;
 331             if (ch == dc->u.x.font.metrics.tmBreakChar)
 332                 extraWidth += dc->w.breakExtra;
 333
 334             if (dc->w.backgroundMode == TRANSPARENT)
 335                 XDrawString( XT_display, dc->u.x.drawable, dc->u.x.gc,
 336                              dc->w.DCOrgX + xchar, dc->w.DCOrgY + y, p, 1 );
 337             else
 338             {
 339                 XDrawImageString( XT_display, dc->u.x.drawable, dc->u.x.gc,
 340                                   dc->w.DCOrgX + xchar, dc->w.DCOrgY + y, p, 1 );
 341                 XSetForeground( XT_display, dc->u.x.gc, dc->w.backgroundPixel);
 342                 XFillRectangle( XT_display, dc->u.x.drawable, dc->u.x.gc,
 343                                 dc->w.DCOrgX + xchar + charStr->width,
 344                                 dc->w.DCOrgY + y - font->ascent,
 345                                 extraWidth, font->ascent + font->descent );
 346                 XSetForeground( XT_display, dc->u.x.gc, dc->w.textPixel );
 347             }
 348             xchar += charStr->width + extraWidth;
 349         }
 350     }
 351
 352       /* Draw underline and strike-out if needed */
 353
 354     if (dc->u.x.font.metrics.tmUnderlined)
 355     {
 356         long linePos, lineWidth;
 357         if (!XGetFontProperty( font, XA_UNDERLINE_POSITION, &linePos ))
 358             linePos = font->descent-1;
 359         if (!XGetFontProperty( font, XA_UNDERLINE_THICKNESS, &lineWidth ))
 360             lineWidth = 0;
 361         else if (lineWidth == 1) lineWidth = 0;
 362         XSetLineAttributes( XT_display, dc->u.x.gc, lineWidth,
 363                             LineSolid, CapRound, JoinBevel );
 364         XDrawLine( XT_display, dc->u.x.drawable, dc->u.x.gc,
 365                    dc->w.DCOrgX + x, dc->w.DCOrgY + y + linePos,
 366                    dc->w.DCOrgX + x + info.width, dc->w.DCOrgY + y + linePos );
 367     }
 368     if (dc->u.x.font.metrics.tmStruckOut)
 369     {
 370         long lineAscent, lineDescent;
 371         if (!XGetFontProperty( font, XA_STRIKEOUT_ASCENT, &lineAscent ))
 372             lineAscent = font->ascent / 3;
 373         if (!XGetFontProperty( font, XA_STRIKEOUT_DESCENT, &lineDescent ))
 374             lineDescent = -lineAscent;
 375         XSetLineAttributes( XT_display, dc->u.x.gc, lineAscent + lineDescent,
 376                             LineSolid, CapRound, JoinBevel );
 377         XDrawLine( XT_display, dc->u.x.drawable, dc->u.x.gc,
 378                    dc->w.DCOrgX + x, dc->w.DCOrgY + y - lineAscent,
 379                    dc->w.DCOrgX + x + info.width, dc->w.DCOrgY + y - lineAscent );
 380     }
 381
 382     return TRUE;
 383 }