Pileus Git - ~andy/gtk/blob - gtk/gtktextdisplay.c

   1 /* gtktextdisplay.c - display layed-out text
   2  *
   3  * Copyright (c) 1992-1994 The Regents of the University of California.
   4  * Copyright (c) 1994-1997 Sun Microsystems, Inc.
   5  * Copyright (c) 2000 Red Hat, Inc.
   6  * Tk->Gtk port by Havoc Pennington
   7  *
   8  * This file can be used under your choice of two licenses, the LGPL
   9  * and the original Tk license.
  10  *
  11  * LGPL:
  12  *
  13  * This library is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU Lesser General Public
  15  * License as published by the Free Software Foundation; either
  16  * version 2 of the License, or (at your option) any later version.
  17  *
  18  * This library is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  21  * Lesser General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU Lesser General Public
  24  * License along with this library; if not, write to the Free
  25  * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  26  *
  27  * Original Tk license:
  28  *
  29  * This software is copyrighted by the Regents of the University of
  30  * California, Sun Microsystems, Inc., and other parties.  The
  31  * following terms apply to all files associated with the software
  32  * unless explicitly disclaimed in individual files.
  33  *
  34  * The authors hereby grant permission to use, copy, modify,
  35  * distribute, and license this software and its documentation for any
  36  * purpose, provided that existing copyright notices are retained in
  37  * all copies and that this notice is included verbatim in any
  38  * distributions. No written agreement, license, or royalty fee is
  39  * required for any of the authorized uses.  Modifications to this
  40  * software may be copyrighted by their authors and need not follow
  41  * the licensing terms described here, provided that the new terms are
  42  * clearly indicated on the first page of each file where they apply.
  43  *
  44  * IN NO EVENT SHALL THE AUTHORS OR DISTRIBUTORS BE LIABLE TO ANY
  45  * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
  46  * DAMAGES ARISING OUT OF THE USE OF THIS SOFTWARE, ITS DOCUMENTATION,
  47  * OR ANY DERIVATIVES THEREOF, EVEN IF THE AUTHORS HAVE BEEN ADVISED
  48  * OF THE POSSIBILITY OF SUCH DAMAGE.
  49  *
  50  * THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES,
  51  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  52  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND
  53  * NON-INFRINGEMENT.  THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS,
  54  * AND THE AUTHORS AND DISTRIBUTORS HAVE NO OBLIGATION TO PROVIDE
  55  * MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
  56  *
  57  * GOVERNMENT USE: If you are acquiring this software on behalf of the
  58  * U.S. government, the Government shall have only "Restricted Rights"
  59  * in the software and related documentation as defined in the Federal
  60  * Acquisition Regulations (FARs) in Clause 52.227.19 (c) (2).  If you
  61  * are acquiring the software on behalf of the Department of Defense,
  62  * the software shall be classified as "Commercial Computer Software"
  63  * and the Government shall have only "Restricted Rights" as defined
  64  * in Clause 252.227-7013 (c) (1) of DFARs.  Notwithstanding the
  65  * foregoing, the authors grant the U.S. Government and others acting
  66  * in its behalf permission to use and distribute the software in
  67  * accordance with the terms specified in this license.
  68  *
  69  */
  70 /*
  71  * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
  72  * file for a list of people on the GTK+ Team.  See the ChangeLog
  73  * files for a list of changes.  These files are distributed with
  74  * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
  75  */
  76
  77 #include "gtktextdisplay.h"
  78 /* DO NOT go putting private headers in here. This file should only
  79  * use the semi-public headers, as with gtktextview.c.
  80  */
  81
  82 #include <pango/pango.h>
  83
  84 typedef struct _GtkTextRenderState GtkTextRenderState;
  85
  86 struct _GtkTextRenderState
  87 {
  88   GtkWidget *widget;
  89
  90   GtkTextAppearance *last_appearance;
  91   GtkTextAppearance *last_bg_appearance;
  92   GdkGC *fg_gc;
  93   GdkGC *bg_gc;
  94   GdkRectangle clip_rect;
  95 };
  96
  97 static void       get_item_properties (PangoItem           *item,
  98                                        GtkTextAppearance  **appearance);
  99 static GdkRegion *get_selected_clip   (GtkTextRenderState  *render_state,
 100                                        PangoLayout         *layout,
 101                                        PangoLayoutLine     *line,
 102                                        int                  x,
 103                                        int                  y,
 104                                        int                  height,
 105                                        int                  start_index,
 106                                        int                  end_index);
 107
 108 static GtkTextRenderState *
 109 gtk_text_render_state_new (GtkWidget    *widget,
 110                            GdkDrawable  *drawable,
 111                            GdkRectangle *clip_rect)
 112 {
 113   GtkTextRenderState *state = g_new0 (GtkTextRenderState, 1);
 114
 115   state->widget = widget;
 116   state->fg_gc = gdk_gc_new (drawable);
 117   state->bg_gc = gdk_gc_new (drawable);
 118   state->clip_rect = *clip_rect;
 119
 120   return state;
 121 }
 122
 123 static void
 124 gtk_text_render_state_destroy (GtkTextRenderState *state)
 125 {
 126   gdk_gc_unref (state->fg_gc);
 127   gdk_gc_unref (state->bg_gc);
 128
 129   g_free (state);
 130 }
 131
 132 static void
 133 gtk_text_render_state_set_color (GtkTextRenderState *state,
 134                                  GdkGC              *gc,
 135                                  GdkColor           *color)
 136 {
 137   gdk_colormap_alloc_color (gtk_widget_get_colormap (state->widget), color, FALSE, TRUE);
 138   gdk_gc_set_foreground (gc, color);
 139 }
 140
 141 static void
 142 gtk_text_render_state_update (GtkTextRenderState *state,
 143                               GtkTextAppearance  *new_appearance)
 144 {
 145   if (!state->last_appearance ||
 146       !gdk_color_equal (&new_appearance->fg_color, &state->last_appearance->fg_color))
 147     gtk_text_render_state_set_color (state, state->fg_gc, &new_appearance->fg_color);
 148
 149   if (!state->last_appearance ||
 150       new_appearance->fg_stipple != state->last_appearance->fg_stipple)
 151     {
 152       if (new_appearance->fg_stipple)
 153         {
 154           gdk_gc_set_fill (state->fg_gc, GDK_STIPPLED);
 155           gdk_gc_set_stipple (state->fg_gc, new_appearance->fg_stipple);
 156         }
 157       else
 158         {
 159           gdk_gc_set_fill (state->fg_gc, GDK_SOLID);
 160         }
 161     }
 162
 163   if (new_appearance->draw_bg)
 164     {
 165       if (!state->last_bg_appearance ||
 166           !gdk_color_equal (&new_appearance->bg_color, &state->last_bg_appearance->bg_color))
 167         gtk_text_render_state_set_color (state, state->bg_gc, &new_appearance->bg_color);
 168
 169       if (!state->last_bg_appearance ||
 170           new_appearance->bg_stipple != state->last_bg_appearance->bg_stipple)
 171         {
 172           if (new_appearance->bg_stipple)
 173             {
 174               gdk_gc_set_fill (state->bg_gc, GDK_STIPPLED);
 175               gdk_gc_set_stipple (state->bg_gc, new_appearance->bg_stipple);
 176             }
 177           else
 178             {
 179               gdk_gc_set_fill (state->bg_gc, GDK_SOLID);
 180             }
 181         }
 182
 183       state->last_bg_appearance = new_appearance;
 184     }
 185
 186   state->last_appearance = new_appearance;
 187 }
 188
 189 static void
 190 get_shape_extents (PangoLayoutRun *run,
 191                    PangoRectangle *ink_rect,
 192                    PangoRectangle *logical_rect)
 193 {
 194   GSList *tmp_list = run->item->analysis.extra_attrs;
 195
 196   while (tmp_list)
 197     {
 198       PangoAttribute *attr = tmp_list->data;
 199
 200       if (attr->klass->type == PANGO_ATTR_SHAPE)
 201         {
 202           if (logical_rect)
 203             *logical_rect = ((PangoAttrShape *)attr)->logical_rect;
 204
 205           if (ink_rect)
 206             *ink_rect = ((PangoAttrShape *)attr)->ink_rect;
 207
 208           return;
 209         }
 210
 211       tmp_list = tmp_list->next;
 212     }
 213
 214   g_assert_not_reached ();
 215 }
 216
 217 static void
 218 render_layout_line (GdkDrawable        *drawable,
 219                     GtkTextRenderState *render_state,
 220                     PangoLayoutLine    *line,
 221                     GSList            **shaped_pointer,
 222                     int                 x,
 223                     int                 y,
 224                     gboolean            selected)
 225 {
 226   GSList *tmp_list = line->runs;
 227   PangoRectangle overall_rect;
 228   PangoRectangle logical_rect;
 229   PangoRectangle ink_rect;
 230   gint x_off = 0;
 231   GdkGC *fg_gc;
 232
 233   pango_layout_line_get_extents (line, NULL, &overall_rect);
 234
 235   while (tmp_list)
 236     {
 237       PangoLayoutRun *run = tmp_list->data;
 238       GtkTextAppearance *appearance;
 239       gint risen_y;
 240       gint shaped_width_pixels = 0;
 241       gboolean need_ink = FALSE;
 242
 243       tmp_list = tmp_list->next;
 244
 245       get_item_properties (run->item, &appearance);
 246
 247       g_assert (appearance != NULL);
 248
 249       risen_y = y - PANGO_PIXELS (appearance->rise);
 250
 251       if (selected)
 252         {
 253           if (GTK_WIDGET_HAS_FOCUS (render_state->widget))
 254             fg_gc = render_state->widget->style->text_gc[GTK_STATE_SELECTED];
 255           else
 256             fg_gc = render_state->widget->style->text_gc [GTK_STATE_ACTIVE];
 257         }
 258       else
 259         {
 260           gtk_text_render_state_update (render_state, appearance);
 261
 262           fg_gc = render_state->fg_gc;
 263         }
 264
 265       if (appearance->underline != PANGO_UNDERLINE_NONE ||
 266           appearance->strikethrough)
 267         need_ink = TRUE;
 268
 269       if (appearance->is_text)
 270         {
 271           if (need_ink)
 272             pango_glyph_string_extents (run->glyphs, run->item->analysis.font,
 273                                         &ink_rect, &logical_rect);
 274           else
 275             pango_glyph_string_extents (run->glyphs, run->item->analysis.font,
 276                                         NULL, &logical_rect);
 277         }
 278       else
 279         {
 280           if (need_ink)
 281             get_shape_extents (run, &ink_rect, &logical_rect);
 282           else
 283             get_shape_extents (run, NULL, &logical_rect);
 284         }
 285
 286       if (appearance->draw_bg && !selected)
 287         gdk_draw_rectangle (drawable, render_state->bg_gc, TRUE,
 288                             x + PANGO_PIXELS (x_off) + PANGO_PIXELS (logical_rect.x),
 289                             risen_y + PANGO_PIXELS (logical_rect.y),
 290                             PANGO_PIXELS (logical_rect.width),
 291                             PANGO_PIXELS (logical_rect.height));
 292
 293       if (appearance->is_text)
 294         gdk_draw_glyphs (drawable, fg_gc,
 295                          run->item->analysis.font,
 296                          x + PANGO_PIXELS (x_off),
 297                          risen_y, run->glyphs);
 298       else
 299         {
 300           GObject *shaped = (*shaped_pointer)->data;
 301
 302           *shaped_pointer = (*shaped_pointer)->next;
 303
 304           if (shaped == NULL)
 305             {
 306               /* This happens if we have an empty widget anchor. Draw
 307                * something empty-looking.
 308                */
 309               GdkRectangle shape_rect, draw_rect;
 310
 311               shape_rect.x = x + x_off / PANGO_SCALE;
 312               shape_rect.y = risen_y - PANGO_PIXELS (logical_rect.height);
 313               shape_rect.width = PANGO_PIXELS (logical_rect.width);
 314               shape_rect.height = PANGO_PIXELS (logical_rect.height);
 315
 316               if (gdk_rectangle_intersect (&shape_rect, &render_state->clip_rect,
 317                                            &draw_rect))
 318                 {
 319                   gdk_draw_rectangle (drawable, render_state->fg_gc,
 320                                       FALSE, shape_rect.x, shape_rect.y,
 321                                       shape_rect.width, shape_rect.height);
 322
 323                   gdk_draw_line (drawable, render_state->fg_gc,
 324                                  shape_rect.x, shape_rect.y,
 325                                  shape_rect.x + shape_rect.width,
 326                                  shape_rect.y + shape_rect.height);
 327
 328                   gdk_draw_line (drawable, render_state->fg_gc,
 329                                  shape_rect.x + shape_rect.width, shape_rect.y,
 330                                  shape_rect.x,
 331                                  shape_rect.y + shape_rect.height);
 332                 }
 333             }
 334           else if (GDK_IS_PIXBUF (shaped))
 335             {
 336               gint width, height;
 337               GdkRectangle pixbuf_rect, draw_rect;
 338               GdkPixbuf *pixbuf;
 339
 340               pixbuf = GDK_PIXBUF (shaped);
 341
 342               width = gdk_pixbuf_get_width (pixbuf);
 343               height = gdk_pixbuf_get_height (pixbuf);
 344
 345               pixbuf_rect.x = x + x_off / PANGO_SCALE;
 346               pixbuf_rect.y = risen_y - height;
 347               pixbuf_rect.width = width;
 348               pixbuf_rect.height = height;
 349
 350               if (gdk_rectangle_intersect (&pixbuf_rect, &render_state->clip_rect,
 351                                            &draw_rect))
 352                 {
 353                   GdkBitmap *mask = NULL;
 354
 355                   if (gdk_pixbuf_get_has_alpha (pixbuf))
 356                     {
 357                       mask = gdk_pixmap_new (drawable,
 358                                              gdk_pixbuf_get_width (pixbuf),
 359                                              gdk_pixbuf_get_height (pixbuf),
 360                                              1);
 361
 362                       gdk_pixbuf_render_threshold_alpha (pixbuf, mask,
 363                                                          0, 0, 0, 0,
 364                                                          gdk_pixbuf_get_width (pixbuf),
 365                                                          gdk_pixbuf_get_height (pixbuf),
 366                                                          128);
 367
 368                     }
 369
 370                   if (mask)
 371                     {
 372                       gdk_gc_set_clip_mask (render_state->fg_gc, mask);
 373                       gdk_gc_set_clip_origin (render_state->fg_gc,
 374                                               pixbuf_rect.x, pixbuf_rect.y);
 375                     }
 376
 377                   gdk_pixbuf_render_to_drawable (pixbuf,
 378                                                  drawable,
 379                                                  render_state->fg_gc,
 380                                                  draw_rect.x - pixbuf_rect.x,
 381                                                  draw_rect.y - pixbuf_rect.y,
 382                                                  draw_rect.x, draw_rect.y,
 383                                                  draw_rect.width,
 384                                                  draw_rect.height,
 385                                                  GDK_RGB_DITHER_NORMAL,
 386                                                  0, 0);
 387
 388                   if (mask)
 389                     {
 390                       gdk_gc_set_clip_rectangle (render_state->fg_gc,
 391                                                  &render_state->clip_rect);
 392                       g_object_unref (G_OBJECT (mask));
 393                     }
 394                 }
 395
 396               shaped_width_pixels = width;
 397             }
 398           else if (GTK_IS_WIDGET (shaped))
 399             {
 400               gint width, height;
 401               GdkRectangle draw_rect;
 402               GtkWidget *widget;
 403
 404               widget = GTK_WIDGET (shaped);
 405
 406               width = widget->allocation.width;
 407               height = widget->allocation.height;
 408
 409               g_print ("widget allocation at %d,%d %d x %d\n",
 410                        widget->allocation.x,
 411                        widget->allocation.y,
 412                        widget->allocation.width,
 413                        widget->allocation.height);
 414
 415               if (GTK_WIDGET_DRAWABLE (widget) &&
 416                   gdk_rectangle_intersect (&widget->allocation,
 417                                            &render_state->clip_rect,
 418                                            &draw_rect))
 419
 420                 {
 421                   g_print ("drawing widget area %d,%d %d x %d\n",
 422                            draw_rect.x,
 423                            draw_rect.y,
 424                            draw_rect.width,
 425                            draw_rect.height);
 426
 427                   gtk_widget_draw (widget, &draw_rect);
 428                 }
 429
 430               shaped_width_pixels = width;
 431             }
 432           else
 433             g_assert_not_reached (); /* not a pixbuf or widget */
 434         }
 435
 436       switch (appearance->underline)
 437         {
 438         case PANGO_UNDERLINE_NONE:
 439           break;
 440         case PANGO_UNDERLINE_DOUBLE:
 441           g_assert (need_ink);
 442           gdk_draw_line (drawable, fg_gc,
 443                          x + (x_off + ink_rect.x) / PANGO_SCALE - 1,
 444                          risen_y + 3,
 445                          x + (x_off + ink_rect.x + ink_rect.width) / PANGO_SCALE,
 446                          risen_y + 3);
 447           /* Fall through */
 448         case PANGO_UNDERLINE_SINGLE:
 449           g_assert (need_ink);
 450           gdk_draw_line (drawable, fg_gc,
 451                          x + (x_off + ink_rect.x) / PANGO_SCALE - 1,
 452                          risen_y + 1,
 453                          x + (x_off + ink_rect.x + ink_rect.width) / PANGO_SCALE,
 454                          risen_y + 1);
 455           break;
 456         case PANGO_UNDERLINE_LOW:
 457           g_assert (need_ink);
 458           gdk_draw_line (drawable, fg_gc,
 459                          x + (x_off + ink_rect.x) / PANGO_SCALE - 1,
 460                          risen_y + (ink_rect.y + ink_rect.height) / PANGO_SCALE + 1,
 461                          x + (x_off + ink_rect.x + ink_rect.width) / PANGO_SCALE,
 462                          risen_y + (ink_rect.y + ink_rect.height) / PANGO_SCALE + 1);
 463           break;
 464         }
 465
 466       if (appearance->strikethrough)
 467         {
 468           gint strikethrough_y = risen_y + (0.3 * logical_rect.y) / PANGO_SCALE;
 469
 470           g_assert (need_ink);
 471
 472           gdk_draw_line (drawable, fg_gc,
 473                          x + (x_off + ink_rect.x) / PANGO_SCALE - 1, strikethrough_y,
 474                          x + (x_off + ink_rect.x + ink_rect.width) / PANGO_SCALE, strikethrough_y);
 475         }
 476
 477       if (appearance->is_text)
 478         x_off += logical_rect.width;
 479       else
 480         x_off += shaped_width_pixels * PANGO_SCALE;
 481     }
 482 }
 483
 484 static void
 485 render_para (GdkDrawable        *drawable,
 486              GtkTextRenderState *render_state,
 487              GtkTextLineDisplay *line_display,
 488              /* Top-left corner of paragraph including all margins */
 489              int                 x,
 490              int                 y,
 491              int                 selection_start_index,
 492              int                 selection_end_index)
 493 {
 494   GSList *shaped_pointer = line_display->shaped_objects;
 495   PangoLayout *layout = line_display->layout;
 496   int byte_offset = 0;
 497   PangoLayoutIter *iter;
 498   PangoRectangle layout_logical;
 499   int screen_width;
 500   GdkGC *fg_gc, *bg_gc;
 501   gint state;
 502
 503   gboolean first = TRUE;
 504
 505   iter = pango_layout_get_iter (layout);
 506
 507   pango_layout_iter_get_layout_extents (iter, NULL, &layout_logical);
 508
 509   /* Adjust for margins */
 510
 511   layout_logical.x += line_display->x_offset * PANGO_SCALE;
 512   layout_logical.y += line_display->top_margin * PANGO_SCALE;
 513
 514   screen_width = line_display->total_width;
 515
 516   if (GTK_WIDGET_HAS_FOCUS (render_state->widget))
 517     state = GTK_STATE_SELECTED;
 518   else
 519     state = GTK_STATE_ACTIVE;
 520
 521   fg_gc = render_state->widget->style->text_gc [state];
 522   bg_gc = render_state->widget->style->base_gc [state];
 523
 524   do
 525     {
 526       PangoLayoutLine *line = pango_layout_iter_get_line (iter);
 527       int selection_y, selection_height;
 528       int first_y, last_y;
 529       PangoRectangle line_rect;
 530       int baseline;
 531
 532       pango_layout_iter_get_line_extents (iter, NULL, &line_rect);
 533       baseline = pango_layout_iter_get_baseline (iter);
 534       pango_layout_iter_get_line_yrange (iter, &first_y, &last_y);
 535
 536       /* Adjust for margins */
 537
 538       line_rect.x += line_display->x_offset * PANGO_SCALE;
 539       line_rect.y += line_display->top_margin * PANGO_SCALE;
 540       baseline += line_display->top_margin * PANGO_SCALE;
 541
 542       /* Selection is the height of the line, plus top/bottom
 543        * margin if we're the first/last line
 544        */
 545       selection_y = y + PANGO_PIXELS (first_y) + line_display->top_margin;
 546       selection_height = PANGO_PIXELS (last_y) - PANGO_PIXELS (first_y);
 547
 548       if (first)
 549         {
 550           selection_y -= line_display->top_margin;
 551           selection_height += line_display->top_margin;
 552         }
 553
 554       if (pango_layout_iter_at_last_line (iter))
 555         selection_height += line_display->bottom_margin;
 556
 557       first = FALSE;
 558
 559       if (selection_start_index < byte_offset &&
 560           selection_end_index > line->length + byte_offset) /* All selected */
 561         {
 562           gdk_draw_rectangle (drawable,
 563                               bg_gc,
 564                               TRUE,
 565                               x + line_display->left_margin,
 566                               selection_y,
 567                               screen_width,
 568                               selection_height);
 569
 570           render_layout_line (drawable, render_state, line, &shaped_pointer,
 571                               x + PANGO_PIXELS (line_rect.x),
 572                               y + PANGO_PIXELS (baseline),
 573                               TRUE);
 574         }
 575       else
 576         {
 577           GSList *shaped_pointer_tmp = shaped_pointer;
 578
 579           render_layout_line (drawable, render_state,
 580                               line, &shaped_pointer,
 581                               x + PANGO_PIXELS (line_rect.x),
 582                               y + PANGO_PIXELS (baseline),
 583                               FALSE);
 584
 585           if (selection_start_index <= byte_offset + line->length &&
 586               selection_end_index > byte_offset) /* Some selected */
 587             {
 588               GdkRegion *clip_region = get_selected_clip (render_state, layout, line,
 589                                                           x + line_display->x_offset,
 590                                                           selection_y,
 591                                                           selection_height,
 592                                                           selection_start_index, selection_end_index);
 593               gdk_gc_set_clip_region (fg_gc, clip_region);
 594               gdk_gc_set_clip_region (bg_gc, clip_region);
 595
 596               gdk_draw_rectangle (drawable,
 597                                   bg_gc,
 598                                   TRUE,
 599                                   x + PANGO_PIXELS (line_rect.x),
 600                                   selection_y,
 601                                   PANGO_PIXELS (line_rect.width),
 602                                   selection_height);
 603
 604               render_layout_line (drawable, render_state, line, &shaped_pointer_tmp,
 605                                   x + PANGO_PIXELS (line_rect.x),
 606                                   y + PANGO_PIXELS (baseline),
 607                                   TRUE);
 608
 609               gdk_gc_set_clip_region (fg_gc, NULL);
 610               gdk_gc_set_clip_region (bg_gc, NULL);
 611
 612               gdk_region_destroy (clip_region);
 613
 614               /* Paint in the ends of the line */
 615               if (line_rect.x > line_display->left_margin * PANGO_SCALE &&
 616                   ((line_display->direction == GTK_TEXT_DIR_LTR && selection_start_index < byte_offset) ||
 617                    (line_display->direction == GTK_TEXT_DIR_RTL && selection_end_index > byte_offset + line->length)))
 618                 {
 619                   gdk_draw_rectangle (drawable,
 620                                       bg_gc,
 621                                       TRUE,
 622                                       x + line_display->left_margin,
 623                                       selection_y,
 624                                       PANGO_PIXELS (line_rect.x) - line_display->left_margin,
 625                                       selection_height);
 626                 }
 627
 628               if (line_rect.x + line_rect.width <
 629                   (screen_width + line_display->left_margin) * PANGO_SCALE &&
 630                   ((line_display->direction == GTK_TEXT_DIR_LTR && selection_end_index > byte_offset + line->length) ||
 631                    (line_display->direction == GTK_TEXT_DIR_RTL && selection_start_index < byte_offset)))
 632                 {
 633                   int nonlayout_width;
 634
 635                   nonlayout_width =
 636                     line_display->left_margin + screen_width -
 637                     PANGO_PIXELS (line_rect.x) - PANGO_PIXELS (line_rect.width);
 638
 639                   gdk_draw_rectangle (drawable,
 640                                       bg_gc,
 641                                       TRUE,
 642                                       x + PANGO_PIXELS (line_rect.x) + PANGO_PIXELS (line_rect.width),
 643                                       selection_y,
 644                                       nonlayout_width,
 645                                       selection_height);
 646                 }
 647             }
 648         }
 649
 650       byte_offset += line->length;
 651     }
 652   while (pango_layout_iter_next_line (iter));
 653
 654   pango_layout_iter_free (iter);
 655 }
 656
 657 static GdkRegion *
 658 get_selected_clip (GtkTextRenderState *render_state,
 659                    PangoLayout        *layout,
 660                    PangoLayoutLine    *line,
 661                    int                 x,
 662                    int                 y,
 663                    int                 height,
 664                    int                 start_index,
 665                    int                 end_index)
 666 {
 667   gint *ranges;
 668   gint n_ranges, i;
 669   GdkRegion *clip_region = gdk_region_new ();
 670   GdkRegion *tmp_region;
 671
 672   pango_layout_line_get_x_ranges (line, start_index, end_index, &ranges, &n_ranges);
 673
 674   for (i=0; i < n_ranges; i++)
 675     {
 676       GdkRectangle rect;
 677
 678       rect.x = x + PANGO_PIXELS (ranges[2*i]);
 679       rect.y = y;
 680       rect.width = PANGO_PIXELS (ranges[2*i + 1]) - PANGO_PIXELS (ranges[2*i]);
 681       rect.height = height;
 682
 683       gdk_region_union_with_rect (clip_region, &rect);
 684     }
 685
 686   tmp_region = gdk_region_rectangle (&render_state->clip_rect);
 687   gdk_region_intersect (clip_region, tmp_region);
 688   gdk_region_destroy (tmp_region);
 689
 690   g_free (ranges);
 691   return clip_region;
 692 }
 693
 694 static void
 695 get_item_properties (PangoItem          *item,
 696                      GtkTextAppearance **appearance)
 697 {
 698   GSList *tmp_list = item->analysis.extra_attrs;
 699
 700   *appearance = NULL;
 701
 702   while (tmp_list)
 703     {
 704       PangoAttribute *attr = tmp_list->data;
 705
 706       if (attr->klass->type == gtk_text_attr_appearance_type)
 707         {
 708           *appearance = &((GtkTextAttrAppearance *)attr)->appearance;
 709         }
 710
 711       tmp_list = tmp_list->next;
 712     }
 713 }
 714
 715 void
 716 gtk_text_layout_draw (GtkTextLayout *layout,
 717                       GtkWidget *widget,
 718                       GdkDrawable *drawable,
 719                       /* Location of the drawable
 720                          in layout coordinates */
 721                       gint x_offset,
 722                       gint y_offset,
 723                       /* Region of the layout to
 724                          render */
 725                       gint x,
 726                       gint y,
 727                       gint width,
 728                       gint height)
 729 {
 730   GdkRectangle clip;
 731   gint current_y;
 732   GSList *cursor_list;
 733   GtkTextRenderState *render_state;
 734   GtkTextIter selection_start, selection_end;
 735   gboolean have_selection = FALSE;
 736   GSList *line_list;
 737   GSList *tmp_list;
 738
 739   g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
 740   g_return_if_fail (layout->default_style != NULL);
 741   g_return_if_fail (layout->buffer != NULL);
 742   g_return_if_fail (drawable != NULL);
 743   g_return_if_fail (width >= 0);
 744   g_return_if_fail (height >= 0);
 745
 746   if (width == 0 || height == 0)
 747     return;
 748
 749   line_list =  gtk_text_layout_get_lines (layout, y + y_offset, y + y_offset + height, &current_y);
 750   current_y -= y_offset;
 751
 752   if (line_list == NULL)
 753     return; /* nothing on the screen */
 754
 755   clip.x = x;
 756   clip.y = y;
 757   clip.width = width;
 758   clip.height = height;
 759
 760   render_state = gtk_text_render_state_new (widget, drawable, &clip);
 761
 762   gdk_gc_set_clip_rectangle (render_state->fg_gc, &clip);
 763   gdk_gc_set_clip_rectangle (render_state->bg_gc, &clip);
 764
 765   gtk_text_layout_wrap_loop_start (layout);
 766
 767   if (gtk_text_buffer_get_selection_bounds (layout->buffer,
 768                                             &selection_start,
 769                                             &selection_end))
 770     have_selection = TRUE;
 771
 772   tmp_list = line_list;
 773   while (tmp_list != NULL)
 774     {
 775       GtkTextLineDisplay *line_display;
 776       gint selection_start_index = -1;
 777       gint selection_end_index = -1;
 778
 779       GtkTextLine *line = tmp_list->data;
 780
 781       line_display = gtk_text_layout_get_line_display (layout, line, FALSE);
 782
 783       if (line_display->height > 0)
 784         {
 785           g_assert (line_display->layout != NULL);
 786
 787           if (have_selection)
 788             {
 789               GtkTextIter line_start, line_end;
 790               gint byte_count;
 791
 792               gtk_text_layout_get_iter_at_line (layout,
 793                                                 &line_start,
 794                                                 line, 0);
 795               byte_count = gtk_text_iter_get_bytes_in_line (&line_start);
 796
 797               /* FIXME the -1 assumes a newline I think */
 798               gtk_text_layout_get_iter_at_line (layout,
 799                                                 &line_end,
 800                                                 line, byte_count - 1);
 801
 802               if (gtk_text_iter_compare (&selection_start, &line_end) <= 0 &&
 803                   gtk_text_iter_compare (&selection_end, &line_start) >= 0)
 804                 {
 805                   if (gtk_text_iter_compare (&selection_start, &line_start) >= 0)
 806                     selection_start_index = gtk_text_iter_get_line_index (&selection_start);
 807                   else
 808                     selection_start_index = -1;
 809
 810                   if (gtk_text_iter_compare (&selection_end, &line_end) <= 0)
 811                     selection_end_index = gtk_text_iter_get_line_index (&selection_end);
 812                   else
 813                     selection_end_index = byte_count;
 814                 }
 815             }
 816
 817           render_para (drawable, render_state, line_display,
 818                        - x_offset,
 819                        current_y,
 820                        selection_start_index, selection_end_index);
 821
 822
 823           /* We paint the cursors last, because they overlap another chunk
 824          and need to appear on top. */
 825
 826           cursor_list = line_display->cursors;
 827           while (cursor_list)
 828             {
 829               GtkTextCursorDisplay *cursor = cursor_list->data;
 830               GdkGC *gc;
 831
 832               if (cursor->is_strong)
 833                 gc = widget->style->base_gc[GTK_STATE_SELECTED];
 834               else
 835                 gc = widget->style->text_gc[GTK_STATE_NORMAL];
 836
 837               gdk_gc_set_clip_rectangle (gc, &clip);
 838               gdk_draw_line (drawable, gc,
 839                              line_display->x_offset + cursor->x - x_offset,
 840                              current_y + line_display->top_margin + cursor->y,
 841                              line_display->x_offset + cursor->x - x_offset,
 842                              current_y + line_display->top_margin + cursor->y + cursor->height - 1);
 843               gdk_gc_set_clip_rectangle (gc, NULL);
 844
 845               cursor_list = cursor_list->next;
 846             }
 847         } /* line_display->height > 0 */
 848
 849       current_y += line_display->height;
 850       gtk_text_layout_free_line_display (layout, line_display);
 851       render_state->last_appearance = NULL;
 852       render_state->last_bg_appearance = NULL;
 853
 854       tmp_list = g_slist_next (tmp_list);
 855     }
 856
 857   gtk_text_layout_wrap_loop_end (layout);
 858   gtk_text_render_state_destroy (render_state);
 859
 860   g_slist_free (line_list);
 861 }