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 #ifdef HAVE_PANGO_XFT
  68     if (PANGO_XFT_IS_FONT (font))
  69     {
  70         Display* xdisplay = wxGlobalDisplay();
  71         int xscreen = DefaultScreen( xdisplay );
  72         Visual* xvisual = DefaultVisual( xdisplay, xscreen );
  73
  74         Colormap xcolormap = DefaultColormapOfScreen( XScreenOfDisplay( xdisplay, xscreen ) );
  75
  76         XftDraw *draw = XftDrawCreate( xdisplay, drawable, xvisual, xcolormap );
  77         XftColor color;
  78         color.pixel = 0;
  79         color.color.red = colour.Red() << 8;
  80         color.color.green = colour.Green() << 8;
  81         color.color.blue = colour.Blue() << 8;
  82         color.color.alpha = 65000;
  83         pango_xft_render( draw, &color, font, glyphs, x, y );
  84
  85         XftDrawDestroy( draw );
  86     }
  87     else
  88 #endif
  89     {
  90         pango_x_render( wxGlobalDisplay(), drawable, gc, font, glyphs, x, y );
  91     }
  92 }
  93
  94 void
  95 x11_draw_layout_line_with_colors( Drawable         drawable,
  96                                   GC               gc,
  97                                   int              x,
  98                                   int              y,
  99                                   PangoLayoutLine *line,
 100                                   wxColour        &colour )
 101 {
 102     PangoRectangle overall_rect;
 103     PangoRectangle logical_rect;
 104     PangoRectangle ink_rect;
 105     PangoContext *context;
 106     gint x_off = 0;
 107     gint rise = 0;
 108
 109     context = pango_layout_get_context (line->layout);
 110
 111     pango_layout_line_get_extents (line,NULL, &overall_rect);
 112
 113     GSList *tmp_list = line->runs;
 114     while (tmp_list)
 115     {
 116         PangoUnderline uline = PANGO_UNDERLINE_NONE;
 117         PangoLayoutRun *run = (PangoLayoutRun *) tmp_list->data;
 118         PangoColor fg_color, bg_color;
 119         gboolean strike, fg_set, bg_set, shape_set;
 120         gint risen_y;
 121
 122         tmp_list = tmp_list->next;
 123
 124         x11_pango_get_item_properties (run->item, &uline,
 125             &strike, &rise,  &fg_color, &fg_set, &bg_color, &bg_set,
 126             &shape_set, &ink_rect, &logical_rect);
 127
 128         /* we subtract the rise because X coordinates are upside down */
 129         risen_y = y - rise / PANGO_SCALE;
 130
 131         if (!shape_set)
 132         {
 133             if (uline == PANGO_UNDERLINE_NONE)
 134                 pango_glyph_string_extents (run->glyphs, run->item->analysis.font, NULL, &logical_rect);
 135             else
 136                 pango_glyph_string_extents (run->glyphs, run->item->analysis.font, &ink_rect, &logical_rect);
 137         }
 138
 139 #if 0
 140             XDrawRectangle( drawable, gc, TRUE,
 141                               x + (x_off + logical_rect.x) / PANGO_SCALE,
 142                               risen_y + overall_rect.y / PANGO_SCALE,
 143                               logical_rect.width / PANGO_SCALE,
 144                               overall_rect.height / PANGO_SCALE);
 145 #endif
 146
 147         if (!shape_set)
 148         {
 149             int gx = x + x_off / PANGO_SCALE;
 150             int gy = risen_y;
 151
 152             x11_draw_glyphs( drawable, gc, run->item->analysis.font, gx, gy, run->glyphs, colour );
 153         }
 154
 155         if (uline ==  PANGO_UNDERLINE_SINGLE)
 156         {
 157             XDrawLine( wxGlobalDisplay(), drawable, gc,
 158                           x + (x_off + ink_rect.x) / PANGO_SCALE - 1,
 159                           risen_y + 1,
 160                           x + (x_off + ink_rect.x + ink_rect.width) / PANGO_SCALE,
 161                          risen_y + 1);
 162         }
 163
 164         x_off += logical_rect.width;
 165     }
 166 }
 167
 168 void
 169 x11_draw_layout_with_colors( Drawable      drawable,
 170                              GC            gc,
 171                              int           x,
 172                              int           y,
 173                              PangoLayout  *layout,
 174                              wxColour       &colour )
 175 {
 176     PangoLayoutIter *iter = pango_layout_get_iter (layout);
 177
 178     do
 179     {
 180         PangoLayoutLine *line = pango_layout_iter_get_line (iter);
 181
 182         PangoRectangle logical_rect;
 183         pango_layout_iter_get_line_extents (iter, NULL, &logical_rect);
 184
 185         int baseline = pango_layout_iter_get_baseline (iter);
 186
 187         x11_draw_layout_line_with_colors( drawable, gc,
 188                                           x + logical_rect.x / PANGO_SCALE,
 189                                           y + baseline / PANGO_SCALE,
 190                                           line,
 191                                           colour );
 192
 193     } while (pango_layout_iter_next_line (iter));
 194
 195     pango_layout_iter_free (iter);
 196 }
 197
 198 void
 199 x11_draw_layout( Drawable     drawable,
 200                  GC           gc,
 201                  int          x,
 202                  int          y,
 203                  PangoLayout *layout,
 204                  wxColour    &colour)
 205 {
 206     wxCHECK_RET( layout, wxT("No layout") );
 207
 208     x11_draw_layout_with_colors (drawable, gc, x, y, layout, colour );
 209 }
 210
 211 void
 212 x11_pango_get_item_properties( PangoItem      *item,
 213                                PangoUnderline *uline,
 214                                gboolean       *strikethrough,
 215                                gint           *rise,
 216                                PangoColor     *fg_color,
 217                                gboolean       *fg_set,
 218                                PangoColor     *bg_color,
 219                                gboolean       *bg_set,
 220                                gboolean       *shape_set,
 221                                PangoRectangle *ink_rect,
 222                                PangoRectangle *logical_rect)
 223 {
 224   GSList *tmp_list = item->analysis.extra_attrs;
 225
 226   if (strikethrough)
 227       *strikethrough = FALSE;
 228
 229   if (fg_set)
 230     *fg_set = FALSE;
 231
 232   if (bg_set)
 233     *bg_set = FALSE;
 234
 235   if (shape_set)
 236     *shape_set = FALSE;
 237
 238   if (rise)
 239     *rise = 0;
 240
 241   while (tmp_list)
 242     {
 243       PangoAttribute *attr = (PangoAttribute *) tmp_list->data;
 244
 245       switch (attr->klass->type)
 246         {
 247         case PANGO_ATTR_UNDERLINE:
 248           if (uline)
 249             *uline = (PangoUnderline) ((PangoAttrInt *)attr)->value;
 250           break;
 251
 252         case PANGO_ATTR_STRIKETHROUGH:
 253             if (strikethrough)
 254                 *strikethrough = ((PangoAttrInt *)attr)->value;
 255             break;
 256
 257         case PANGO_ATTR_FOREGROUND:
 258           if (fg_color)
 259             *fg_color = ((PangoAttrColor *)attr)->color;
 260           if (fg_set)
 261             *fg_set = TRUE;
 262
 263           break;
 264
 265         case PANGO_ATTR_BACKGROUND:
 266           if (bg_color)
 267             *bg_color = ((PangoAttrColor *)attr)->color;
 268           if (bg_set)
 269             *bg_set = TRUE;
 270
 271           break;
 272
 273         case PANGO_ATTR_SHAPE:
 274           if (shape_set)
 275             *shape_set = TRUE;
 276           if (logical_rect)
 277             *logical_rect = ((PangoAttrShape *)attr)->logical_rect;
 278           if (ink_rect)
 279             *ink_rect = ((PangoAttrShape *)attr)->ink_rect;
 280           break;
 281
 282         case PANGO_ATTR_RISE:
 283           if (rise)
 284             *rise = ((PangoAttrInt *)attr)->value;
 285           break;
 286
 287         default:
 288           break;
 289         }
 290       tmp_list = tmp_list->next;
 291     }
 292 }
 293