src/x11/pango_x.cpp

   1 /**
   2  * This file gets included from dcclient.cpp and implements
   3  * the X11 interface to Pango.
   4  * Copyright (C) Owen Taylor and Robert Roebling.
   5  * Licence: The wxWindows licence
   6  */
   7
   8 /* Declaration */
   9
  10 void
  11 x11_draw_glyphs( Drawable       drawable,
  12                          GC             gc,
  13                          PangoFont     *font,
  14                          int            x,
  15                          int            y,
  16                          PangoGlyphString *glyphs,
  17                  wxColour       &colour );
  18
  19 void
  20 x11_draw_layout_line_with_colors( Drawable         drawable,
  21                                   GC               gc,
  22                                   int              x,
  23                                   int              y,
  24                                   PangoLayoutLine  *line,
  25                                   wxColour       &colour );
  26
  27 void
  28 x11_draw_layout_with_colors( Drawable      drawable,
  29                              GC            gc,
  30                              int           x,
  31                              int           y,
  32                              PangoLayout  *layout,
  33                              wxColour     &colour );
  34
  35 void
  36 x11_draw_layout( Drawable     drawable,
  37                  GC           gc,
  38                  int          x,
  39                  int          y,
  40                  PangoLayout *layout,
  41                  wxColour    &colour);
  42
  43 void
  44 x11_pango_get_item_properties( PangoItem      *item,
  45                                PangoUnderline *uline,
  46                                gboolean       *strikethrough,
  47                                gint           *rise,
  48                                PangoColor     *fg_color,
  49                                gboolean       *fg_set,
  50                                PangoColor     *bg_color,
  51                                gboolean       *bg_set,
  52                                gboolean       *shape_set,
  53                                PangoRectangle *ink_rect,
  54                                PangoRectangle *logical_rect);
  55
  56 /* Implementation */
  57
  58 void
  59 x11_draw_glyphs( Drawable            drawable,
  60                          GC                  gc,
  61                          PangoFont          *font,
  62                          int                 x,
  63                          int                 y,
  64                          PangoGlyphString   *glyphs,
  65                  wxColour           &colour )
  66 {
  67     if (PANGO_XFT_IS_FONT (font))
  68     {
  69         Display* xdisplay = wxGlobalDisplay();
  70         int xscreen = DefaultScreen( xdisplay );
  71         Visual* xvisual = DefaultVisual( xdisplay, xscreen );
  72
  73         Colormap xcolormap = DefaultColormapOfScreen( XScreenOfDisplay( xdisplay, xscreen ) );
  74
  75         XftDraw *draw = XftDrawCreate( xdisplay, drawable, xvisual, xcolormap );
  76         XftColor color;
  77         color.pixel = 0;
  78         color.color.red = colour.Red() << 8;
  79         color.color.green = colour.Green() << 8;
  80         color.color.blue = colour.Blue() << 8;
  81         color.color.alpha = 65000;
  82         pango_xft_render( draw, &color, font, glyphs, x, y );
  83
  84         XftDrawDestroy( draw );
  85     }
  86     else
  87     {
  88         pango_x_render( wxGlobalDisplay(), drawable, gc, font, glyphs, x, y );
  89     }
  90 }
  91
  92 void
  93 x11_draw_layout_line_with_colors( Drawable         drawable,
  94                                   GC               gc,
  95                                   int              x,
  96                                   int              y,
  97                                   PangoLayoutLine *line,
  98                                   wxColour        &colour )
  99 {
 100     PangoRectangle overall_rect;
 101     PangoRectangle logical_rect;
 102     PangoRectangle ink_rect;
 103     PangoContext *context;
 104     gint x_off = 0;
 105     gint rise = 0;
 106
 107     context = pango_layout_get_context (line->layout);
 108
 109     pango_layout_line_get_extents (line,NULL, &overall_rect);
 110
 111     GSList *tmp_list = line->runs;
 112     while (tmp_list)
 113     {
 114         PangoUnderline uline = PANGO_UNDERLINE_NONE;
 115         PangoLayoutRun *run = (PangoLayoutRun *) tmp_list->data;
 116         PangoColor fg_color, bg_color;
 117         gboolean strike, fg_set, bg_set, shape_set;
 118         gint risen_y;
 119
 120         tmp_list = tmp_list->next;
 121
 122         x11_pango_get_item_properties (run->item, &uline,
 123             &strike, &rise,  &fg_color, &fg_set, &bg_color, &bg_set,
 124             &shape_set, &ink_rect, &logical_rect);
 125
 126         /* we subtract the rise because X coordinates are upside down */
 127         risen_y = y - rise / PANGO_SCALE;
 128
 129         if (!shape_set)
 130         {
 131             if (uline == PANGO_UNDERLINE_NONE)
 132                 pango_glyph_string_extents (run->glyphs, run->item->analysis.font, NULL, &logical_rect);
 133             else
 134                 pango_glyph_string_extents (run->glyphs, run->item->analysis.font, &ink_rect, &logical_rect);
 135         }
 136
 137 #if 0
 138             XDrawRectangle( drawable, gc, TRUE,
 139                               x + (x_off + logical_rect.x) / PANGO_SCALE,
 140                               risen_y + overall_rect.y / PANGO_SCALE,
 141                               logical_rect.width / PANGO_SCALE,
 142                               overall_rect.height / PANGO_SCALE);
 143 #endif
 144
 145         if (!shape_set)
 146         {
 147             int gx = x + x_off / PANGO_SCALE;
 148             int gy = risen_y;
 149
 150             x11_draw_glyphs( drawable, gc, run->item->analysis.font, gx, gy, run->glyphs, colour );
 151         }
 152
 153         if (uline ==  PANGO_UNDERLINE_SINGLE)
 154         {
 155             XDrawLine( wxGlobalDisplay(), drawable, gc,
 156                           x + (x_off + ink_rect.x) / PANGO_SCALE - 1,
 157                           risen_y + 1,
 158                           x + (x_off + ink_rect.x + ink_rect.width) / PANGO_SCALE,
 159                          risen_y + 1);
 160         }
 161
 162         x_off += logical_rect.width;
 163     }
 164 }
 165
 166 void
 167 x11_draw_layout_with_colors( Drawable      drawable,
 168                              GC            gc,
 169                              int           x,
 170                              int           y,
 171                              PangoLayout  *layout,
 172                              wxColour       &colour )
 173 {
 174     PangoLayoutIter *iter = pango_layout_get_iter (layout);
 175
 176     do
 177     {
 178         PangoLayoutLine *line = pango_layout_iter_get_line (iter);
 179
 180         PangoRectangle logical_rect;
 181         pango_layout_iter_get_line_extents (iter, NULL, &logical_rect);
 182
 183         int baseline = pango_layout_iter_get_baseline (iter);
 184
 185         x11_draw_layout_line_with_colors( drawable, gc,
 186                                           x + logical_rect.x / PANGO_SCALE,
 187                                           y + baseline / PANGO_SCALE,
 188                                           line,
 189                                           colour );
 190
 191     } while (pango_layout_iter_next_line (iter));
 192
 193     pango_layout_iter_free (iter);
 194 }
 195
 196 void
 197 x11_draw_layout( Drawable     drawable,
 198                  GC           gc,
 199                  int          x,
 200                  int          y,
 201                  PangoLayout *layout,
 202                  wxColour    &colour)
 203 {
 204     wxCHECK_RET( layout, wxT("No layout") );
 205
 206     x11_draw_layout_with_colors (drawable, gc, x, y, layout, colour );
 207 }
 208
 209 void
 210 x11_pango_get_item_properties( PangoItem      *item,
 211                                PangoUnderline *uline,
 212                                gboolean       *strikethrough,
 213                                gint           *rise,
 214                                PangoColor     *fg_color,
 215                                gboolean       *fg_set,
 216                                PangoColor     *bg_color,
 217                                gboolean       *bg_set,
 218                                gboolean       *shape_set,
 219                                PangoRectangle *ink_rect,
 220                                PangoRectangle *logical_rect)
 221 {
 222   GSList *tmp_list = item->analysis.extra_attrs;
 223
 224   if (strikethrough)
 225       *strikethrough = FALSE;
 226
 227   if (fg_set)
 228     *fg_set = FALSE;
 229
 230   if (bg_set)
 231     *bg_set = FALSE;
 232
 233   if (shape_set)
 234     *shape_set = FALSE;
 235
 236   if (rise)
 237     *rise = 0;
 238
 239   while (tmp_list)
 240     {
 241       PangoAttribute *attr = (PangoAttribute *) tmp_list->data;
 242
 243       switch (attr->klass->type)
 244         {
 245         case PANGO_ATTR_UNDERLINE:
 246           if (uline)
 247             *uline = (PangoUnderline) ((PangoAttrInt *)attr)->value;
 248           break;
 249
 250         case PANGO_ATTR_STRIKETHROUGH:
 251             if (strikethrough)
 252                 *strikethrough = ((PangoAttrInt *)attr)->value;
 253             break;
 254
 255         case PANGO_ATTR_FOREGROUND:
 256           if (fg_color)
 257             *fg_color = ((PangoAttrColor *)attr)->color;
 258           if (fg_set)
 259             *fg_set = TRUE;
 260
 261           break;
 262
 263         case PANGO_ATTR_BACKGROUND:
 264           if (bg_color)
 265             *bg_color = ((PangoAttrColor *)attr)->color;
 266           if (bg_set)
 267             *bg_set = TRUE;
 268
 269           break;
 270
 271         case PANGO_ATTR_SHAPE:
 272           if (shape_set)
 273             *shape_set = TRUE;
 274           if (logical_rect)
 275             *logical_rect = ((PangoAttrShape *)attr)->logical_rect;
 276           if (ink_rect)
 277             *ink_rect = ((PangoAttrShape *)attr)->ink_rect;
 278           break;
 279
 280         case PANGO_ATTR_RISE:
 281           if (rise)
 282             *rise = ((PangoAttrInt *)attr)->value;
 283           break;
 284
 285         default:
 286           break;
 287         }
 288       tmp_list = tmp_list->next;
 289     }
 290 }
 291