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           fg_gc = render_state->widget->style->text_gc[GTK_STATE_SELECTED];
 254         }
 255       else
 256         {
 257           gtk_text_render_state_update (render_state, appearance);
 258
 259           fg_gc = render_state->fg_gc;
 260         }
 261
 262       if (appearance->underline != PANGO_UNDERLINE_NONE ||
 263           appearance->strikethrough)
 264         need_ink = TRUE;
 265
 266       if (appearance->is_text)
 267         {
 268           if (need_ink)
 269             pango_glyph_string_extents (run->glyphs, run->item->analysis.font,
 270                                         &ink_rect, &logical_rect);
 271           else
 272             pango_glyph_string_extents (run->glyphs, run->item->analysis.font,
 273                                         NULL, &logical_rect);
 274         }
 275       else
 276         {
 277           if (need_ink)
 278             get_shape_extents (run, &ink_rect, &logical_rect);
 279           else
 280             get_shape_extents (run, NULL, &logical_rect);
 281         }
 282
 283       if (appearance->draw_bg && !selected)
 284         gdk_draw_rectangle (drawable, render_state->bg_gc, TRUE,
 285                             x + PANGO_PIXELS (x_off) + PANGO_PIXELS (logical_rect.x),
 286                             risen_y + PANGO_PIXELS (logical_rect.y),
 287                             PANGO_PIXELS (logical_rect.width),
 288                             PANGO_PIXELS (logical_rect.height));
 289
 290       if (appearance->is_text)
 291         gdk_draw_glyphs (drawable, fg_gc,
 292                          run->item->analysis.font,
 293                          x + PANGO_PIXELS (x_off),
 294                          risen_y, run->glyphs);
 295       else
 296         {
 297           GObject *shaped = (*shaped_pointer)->data;
 298
 299           *shaped_pointer = (*shaped_pointer)->next;
 300
 301           if (shaped == NULL)
 302             {
 303               /* This happens if we have an empty widget anchor. Draw
 304                * something empty-looking.
 305                */
 306               GdkRectangle shape_rect, draw_rect;
 307
 308               shape_rect.x = x + x_off / PANGO_SCALE;
 309               shape_rect.y = risen_y - PANGO_PIXELS (logical_rect.height);
 310               shape_rect.width = PANGO_PIXELS (logical_rect.width);
 311               shape_rect.height = PANGO_PIXELS (logical_rect.height);
 312
 313               if (gdk_rectangle_intersect (&shape_rect, &render_state->clip_rect,
 314                                            &draw_rect))
 315                 {
 316                   gdk_draw_rectangle (drawable, render_state->fg_gc,
 317                                       FALSE, shape_rect.x, shape_rect.y,
 318                                       shape_rect.width, shape_rect.height);
 319
 320                   gdk_draw_line (drawable, render_state->fg_gc,
 321                                  shape_rect.x, shape_rect.y,
 322                                  shape_rect.x + shape_rect.width,
 323                                  shape_rect.y + shape_rect.height);
 324
 325                   gdk_draw_line (drawable, render_state->fg_gc,
 326                                  shape_rect.x + shape_rect.width, shape_rect.y,
 327                                  shape_rect.x,
 328                                  shape_rect.y + shape_rect.height);
 329                 }
 330             }
 331           else if (GDK_IS_PIXBUF (shaped))
 332             {
 333               gint width, height;
 334               GdkRectangle pixbuf_rect, draw_rect;
 335               GdkPixbuf *pixbuf;
 336
 337               pixbuf = GDK_PIXBUF (shaped);
 338
 339               width = gdk_pixbuf_get_width (pixbuf);
 340               height = gdk_pixbuf_get_height (pixbuf);
 341
 342               pixbuf_rect.x = x + x_off / PANGO_SCALE;
 343               pixbuf_rect.y = risen_y - height;
 344               pixbuf_rect.width = width;
 345               pixbuf_rect.height = height;
 346
 347               if (gdk_rectangle_intersect (&pixbuf_rect, &render_state->clip_rect,
 348                                            &draw_rect))
 349                 {
 350                   GdkBitmap *mask = NULL;
 351
 352                   if (gdk_pixbuf_get_has_alpha (pixbuf))
 353                     {
 354                       mask = gdk_pixmap_new (drawable,
 355                                              gdk_pixbuf_get_width (pixbuf),
 356                                              gdk_pixbuf_get_height (pixbuf),
 357                                              1);
 358
 359                       gdk_pixbuf_render_threshold_alpha (pixbuf, mask,
 360                                                          0, 0, 0, 0,
 361                                                          gdk_pixbuf_get_width (pixbuf),
 362                                                          gdk_pixbuf_get_height (pixbuf),
 363                                                          128);
 364
 365                     }
 366
 367                   if (mask)
 368                     {
 369                       gdk_gc_set_clip_mask (render_state->fg_gc, mask);
 370                       gdk_gc_set_clip_origin (render_state->fg_gc,
 371                                               pixbuf_rect.x, pixbuf_rect.y);
 372                     }
 373
 374                   gdk_pixbuf_render_to_drawable (pixbuf,
 375                                                  drawable,
 376                                                  render_state->fg_gc,
 377                                                  draw_rect.x - pixbuf_rect.x,
 378                                                  draw_rect.y - pixbuf_rect.y,
 379                                                  draw_rect.x, draw_rect.y,
 380                                                  draw_rect.width,
 381                                                  draw_rect.height,
 382                                                  GDK_RGB_DITHER_NORMAL,
 383                                                  0, 0);
 384
 385                   if (mask)
 386                     {
 387                       gdk_gc_set_clip_rectangle (render_state->fg_gc,
 388                                                  &render_state->clip_rect);
 389                       g_object_unref (G_OBJECT (mask));
 390                     }
 391                 }
 392
 393               shaped_width_pixels = width;
 394             }
 395           else if (GTK_IS_WIDGET (shaped))
 396             {
 397               gint width, height;
 398               GdkRectangle draw_rect;
 399               GtkWidget *widget;
 400
 401               widget = GTK_WIDGET (shaped);
 402
 403               width = widget->allocation.width;
 404               height = widget->allocation.height;
 405
 406               g_print ("widget allocation at %d,%d %d x %d\n",
 407                        widget->allocation.x,
 408                        widget->allocation.y,
 409                        widget->allocation.width,
 410                        widget->allocation.height);
 411
 412               if (GTK_WIDGET_DRAWABLE (widget) &&
 413                   gdk_rectangle_intersect (&widget->allocation,
 414                                            &render_state->clip_rect,
 415                                            &draw_rect))
 416
 417                 {
 418                   g_print ("drawing widget area %d,%d %d x %d\n",
 419                            draw_rect.x,
 420                            draw_rect.y,
 421                            draw_rect.width,
 422                            draw_rect.height);
 423
 424                   gtk_widget_draw (widget, &draw_rect);
 425                 }
 426
 427               shaped_width_pixels = width;
 428             }
 429           else
 430             g_assert_not_reached (); /* not a pixbuf or widget */
 431         }
 432
 433       switch (appearance->underline)
 434         {
 435         case PANGO_UNDERLINE_NONE:
 436           break;
 437         case PANGO_UNDERLINE_DOUBLE:
 438           g_assert (need_ink);
 439           gdk_draw_line (drawable, fg_gc,
 440                          x + (x_off + ink_rect.x) / PANGO_SCALE - 1,
 441                          risen_y + 3,
 442                          x + (x_off + ink_rect.x + ink_rect.width) / PANGO_SCALE,
 443                          risen_y + 3);
 444           /* Fall through */
 445         case PANGO_UNDERLINE_SINGLE:
 446           g_assert (need_ink);
 447           gdk_draw_line (drawable, fg_gc,
 448                          x + (x_off + ink_rect.x) / PANGO_SCALE - 1,
 449                          risen_y + 1,
 450                          x + (x_off + ink_rect.x + ink_rect.width) / PANGO_SCALE,
 451                          risen_y + 1);
 452           break;
 453         case PANGO_UNDERLINE_LOW:
 454           g_assert (need_ink);
 455           gdk_draw_line (drawable, fg_gc,
 456                          x + (x_off + ink_rect.x) / PANGO_SCALE - 1,
 457                          risen_y + (ink_rect.y + ink_rect.height) / PANGO_SCALE + 1,
 458                          x + (x_off + ink_rect.x + ink_rect.width) / PANGO_SCALE,
 459                          risen_y + (ink_rect.y + ink_rect.height) / PANGO_SCALE + 1);
 460           break;
 461         }
 462
 463       if (appearance->strikethrough)
 464         {
 465           gint strikethrough_y = risen_y + (0.3 * logical_rect.y) / PANGO_SCALE;
 466
 467           g_assert (need_ink);
 468
 469           gdk_draw_line (drawable, fg_gc,
 470                          x + (x_off + ink_rect.x) / PANGO_SCALE - 1, strikethrough_y,
 471                          x + (x_off + ink_rect.x + ink_rect.width) / PANGO_SCALE, strikethrough_y);
 472         }
 473
 474       if (appearance->is_text)
 475         x_off += logical_rect.width;
 476       else
 477         x_off += shaped_width_pixels * PANGO_SCALE;
 478     }
 479 }
 480
 481 static void
 482 render_para (GdkDrawable        *drawable,
 483              GtkTextRenderState *render_state,
 484              GtkTextLineDisplay *line_display,
 485              /* Top-left corner of paragraph including all margins */
 486              int                 x,
 487              int                 y,
 488              int                 selection_start_index,
 489              int                 selection_end_index)
 490 {
 491   GSList *shaped_pointer = line_display->shaped_objects;
 492   PangoLayout *layout = line_display->layout;
 493   int byte_offset = 0;
 494   PangoLayoutIter *iter;
 495   PangoRectangle layout_logical;
 496   int screen_width;
 497
 498   gboolean first = TRUE;
 499
 500   iter = pango_layout_get_iter (layout);
 501
 502   pango_layout_iter_get_layout_extents (iter, NULL, &layout_logical);
 503
 504   /* Adjust for margins */
 505
 506   layout_logical.x += line_display->x_offset * PANGO_SCALE;
 507   layout_logical.y += line_display->top_margin * PANGO_SCALE;
 508
 509   screen_width = line_display->total_width;
 510
 511   do
 512     {
 513       PangoLayoutLine *line = pango_layout_iter_get_line (iter);
 514       int selection_y, selection_height;
 515       int first_y, last_y;
 516       PangoRectangle line_rect;
 517       int baseline;
 518
 519       pango_layout_iter_get_line_extents (iter, NULL, &line_rect);
 520       baseline = pango_layout_iter_get_baseline (iter);
 521       pango_layout_iter_get_line_yrange (iter, &first_y, &last_y);
 522
 523       /* Adjust for margins */
 524
 525       line_rect.x += line_display->x_offset * PANGO_SCALE;
 526       line_rect.y += line_display->top_margin * PANGO_SCALE;
 527       baseline += line_display->top_margin * PANGO_SCALE;
 528
 529       /* Selection is the height of the line, plus top/bottom
 530        * margin if we're the first/last line
 531        */
 532       selection_y = y + PANGO_PIXELS (first_y) + line_display->top_margin;
 533       selection_height = PANGO_PIXELS (last_y) - PANGO_PIXELS (first_y);
 534
 535       if (first)
 536         {
 537           selection_y -= line_display->top_margin;
 538           selection_height += line_display->top_margin;
 539         }
 540
 541       if (pango_layout_iter_at_last_line (iter))
 542         selection_height += line_display->bottom_margin;
 543
 544       first = FALSE;
 545
 546       if (selection_start_index < byte_offset &&
 547           selection_end_index > line->length + byte_offset) /* All selected */
 548         {
 549           gdk_draw_rectangle (drawable,
 550                               render_state->widget->style->base_gc[GTK_STATE_SELECTED],
 551                               TRUE,
 552                               x + line_display->left_margin,
 553                               selection_y,
 554                               screen_width,
 555                               selection_height);
 556
 557           render_layout_line (drawable, render_state, line, &shaped_pointer,
 558                               x + PANGO_PIXELS (line_rect.x),
 559                               y + PANGO_PIXELS (baseline),
 560                               TRUE);
 561         }
 562       else
 563         {
 564           GSList *shaped_pointer_tmp = shaped_pointer;
 565
 566           render_layout_line (drawable, render_state,
 567                               line, &shaped_pointer,
 568                               x + PANGO_PIXELS (line_rect.x),
 569                               y + PANGO_PIXELS (baseline),
 570                               FALSE);
 571
 572           if (selection_start_index <= byte_offset + line->length &&
 573               selection_end_index > byte_offset) /* Some selected */
 574             {
 575               GdkRegion *clip_region = get_selected_clip (render_state, layout, line,
 576                                                           x + line_display->x_offset,
 577                                                           selection_y,
 578                                                           selection_height,
 579                                                           selection_start_index, selection_end_index);
 580
 581               gdk_gc_set_clip_region (render_state->widget->style->text_gc [GTK_STATE_SELECTED], clip_region);
 582               gdk_gc_set_clip_region (render_state->widget->style->base_gc [GTK_STATE_SELECTED], clip_region);
 583
 584               gdk_draw_rectangle (drawable,
 585                                   render_state->widget->style->base_gc[GTK_STATE_SELECTED],
 586                                   TRUE,
 587                                   x + PANGO_PIXELS (line_rect.x),
 588                                   selection_y,
 589                                   PANGO_PIXELS (line_rect.width),
 590                                   selection_height);
 591
 592               render_layout_line (drawable, render_state, line, &shaped_pointer_tmp,
 593                                   x + PANGO_PIXELS (line_rect.x),
 594                                   y + PANGO_PIXELS (baseline),
 595                                   TRUE);
 596
 597               gdk_gc_set_clip_region (render_state->widget->style->text_gc [GTK_STATE_SELECTED], NULL);
 598               gdk_gc_set_clip_region (render_state->widget->style->base_gc [GTK_STATE_SELECTED], NULL);
 599
 600               gdk_region_destroy (clip_region);
 601
 602               /* Paint in the ends of the line */
 603               if (line_rect.x > line_display->left_margin * PANGO_SCALE &&
 604                   ((line_display->direction == GTK_TEXT_DIR_LTR && selection_start_index < byte_offset) ||
 605                    (line_display->direction == GTK_TEXT_DIR_RTL && selection_end_index > byte_offset + line->length)))
 606                 {
 607                   gdk_draw_rectangle (drawable,
 608                                       render_state->widget->style->base_gc[GTK_STATE_SELECTED],
 609                                       TRUE,
 610                                       x + line_display->left_margin,
 611                                       selection_y,
 612                                       PANGO_PIXELS (line_rect.x) - line_display->left_margin,
 613                                       selection_height);
 614                 }
 615
 616               if (line_rect.x + line_rect.width <
 617                   (screen_width + line_display->left_margin) * PANGO_SCALE &&
 618                   ((line_display->direction == GTK_TEXT_DIR_LTR && selection_end_index > byte_offset + line->length) ||
 619                    (line_display->direction == GTK_TEXT_DIR_RTL && selection_start_index < byte_offset)))
 620                 {
 621                   int nonlayout_width;
 622
 623                   nonlayout_width =
 624                     line_display->left_margin + screen_width -
 625                     PANGO_PIXELS (line_rect.x) - PANGO_PIXELS (line_rect.width);
 626
 627                   gdk_draw_rectangle (drawable,
 628                                       render_state->widget->style->base_gc[GTK_STATE_SELECTED],
 629                                       TRUE,
 630                                       x + PANGO_PIXELS (line_rect.x) + PANGO_PIXELS (line_rect.width),
 631                                       selection_y,
 632                                       nonlayout_width,
 633                                       selection_height);
 634                 }
 635             }
 636         }
 637
 638       byte_offset += line->length;
 639     }
 640   while (pango_layout_iter_next_line (iter));
 641
 642   pango_layout_iter_free (iter);
 643 }
 644
 645 static GdkRegion *
 646 get_selected_clip (GtkTextRenderState *render_state,
 647                    PangoLayout        *layout,
 648                    PangoLayoutLine    *line,
 649                    int                 x,
 650                    int                 y,
 651                    int                 height,
 652                    int                 start_index,
 653                    int                 end_index)
 654 {
 655   gint *ranges;
 656   gint n_ranges, i;
 657   GdkRegion *clip_region = gdk_region_new ();
 658   GdkRegion *tmp_region;
 659
 660   pango_layout_line_get_x_ranges (line, start_index, end_index, &ranges, &n_ranges);
 661
 662   for (i=0; i < n_ranges; i++)
 663     {
 664       GdkRectangle rect;
 665
 666       rect.x = x + PANGO_PIXELS (ranges[2*i]);
 667       rect.y = y;
 668       rect.width = PANGO_PIXELS (ranges[2*i + 1]) - PANGO_PIXELS (ranges[2*i]);
 669       rect.height = height;
 670
 671       gdk_region_union_with_rect (clip_region, &rect);
 672     }
 673
 674   tmp_region = gdk_region_rectangle (&render_state->clip_rect);
 675   gdk_region_intersect (clip_region, tmp_region);
 676   gdk_region_destroy (tmp_region);
 677
 678   g_free (ranges);
 679   return clip_region;
 680 }
 681
 682 static void
 683 get_item_properties (PangoItem          *item,
 684                      GtkTextAppearance **appearance)
 685 {
 686   GSList *tmp_list = item->analysis.extra_attrs;
 687
 688   *appearance = NULL;
 689
 690   while (tmp_list)
 691     {
 692       PangoAttribute *attr = tmp_list->data;
 693
 694       if (attr->klass->type == gtk_text_attr_appearance_type)
 695         {
 696           *appearance = &((GtkTextAttrAppearance *)attr)->appearance;
 697         }
 698
 699       tmp_list = tmp_list->next;
 700     }
 701 }
 702
 703 void
 704 gtk_text_layout_draw (GtkTextLayout *layout,
 705                       GtkWidget *widget,
 706                       GdkDrawable *drawable,
 707                       /* Location of the drawable
 708                          in layout coordinates */
 709                       gint x_offset,
 710                       gint y_offset,
 711                       /* Region of the layout to
 712                          render */
 713                       gint x,
 714                       gint y,
 715                       gint width,
 716                       gint height)
 717 {
 718   GdkRectangle clip;
 719   gint current_y;
 720   GSList *cursor_list;
 721   GtkTextRenderState *render_state;
 722   GtkTextIter selection_start, selection_end;
 723   gboolean have_selection = FALSE;
 724   GSList *line_list;
 725   GSList *tmp_list;
 726
 727   g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
 728   g_return_if_fail (layout->default_style != NULL);
 729   g_return_if_fail (layout->buffer != NULL);
 730   g_return_if_fail (drawable != NULL);
 731   g_return_if_fail (width >= 0);
 732   g_return_if_fail (height >= 0);
 733
 734   if (width == 0 || height == 0)
 735     return;
 736
 737   line_list =  gtk_text_layout_get_lines (layout, y + y_offset, y + y_offset + height, &current_y);
 738   current_y -= y_offset;
 739
 740   if (line_list == NULL)
 741     return; /* nothing on the screen */
 742
 743   clip.x = x;
 744   clip.y = y;
 745   clip.width = width;
 746   clip.height = height;
 747
 748   render_state = gtk_text_render_state_new (widget, drawable, &clip);
 749
 750   gdk_gc_set_clip_rectangle (render_state->fg_gc, &clip);
 751   gdk_gc_set_clip_rectangle (render_state->bg_gc, &clip);
 752
 753   gtk_text_layout_wrap_loop_start (layout);
 754
 755   if (gtk_text_buffer_get_selection_bounds (layout->buffer,
 756                                             &selection_start,
 757                                             &selection_end))
 758     have_selection = TRUE;
 759
 760   tmp_list = line_list;
 761   while (tmp_list != NULL)
 762     {
 763       GtkTextLineDisplay *line_display;
 764       gint selection_start_index = -1;
 765       gint selection_end_index = -1;
 766
 767       GtkTextLine *line = tmp_list->data;
 768
 769       line_display = gtk_text_layout_get_line_display (layout, line, FALSE);
 770
 771       if (line_display->height > 0)
 772         {
 773           g_assert (line_display->layout != NULL);
 774
 775           if (have_selection)
 776             {
 777               GtkTextIter line_start, line_end;
 778               gint byte_count;
 779
 780               gtk_text_layout_get_iter_at_line (layout,
 781                                                 &line_start,
 782                                                 line, 0);
 783               byte_count = gtk_text_iter_get_bytes_in_line (&line_start);
 784
 785               /* FIXME the -1 assumes a newline I think */
 786               gtk_text_layout_get_iter_at_line (layout,
 787                                                 &line_end,
 788                                                 line, byte_count - 1);
 789
 790               if (gtk_text_iter_compare (&selection_start, &line_end) <= 0 &&
 791                   gtk_text_iter_compare (&selection_end, &line_start) >= 0)
 792                 {
 793                   if (gtk_text_iter_compare (&selection_start, &line_start) >= 0)
 794                     selection_start_index = gtk_text_iter_get_line_index (&selection_start);
 795                   else
 796                     selection_start_index = -1;
 797
 798                   if (gtk_text_iter_compare (&selection_end, &line_end) <= 0)
 799                     selection_end_index = gtk_text_iter_get_line_index (&selection_end);
 800                   else
 801                     selection_end_index = byte_count;
 802                 }
 803             }
 804
 805           render_para (drawable, render_state, line_display,
 806                        - x_offset,
 807                        current_y,
 808                        selection_start_index, selection_end_index);
 809
 810
 811           /* We paint the cursors last, because they overlap another chunk
 812          and need to appear on top. */
 813
 814           cursor_list = line_display->cursors;
 815           while (cursor_list)
 816             {
 817               GtkTextCursorDisplay *cursor = cursor_list->data;
 818               GdkGC *gc;
 819
 820               if (cursor->is_strong)
 821                 gc = widget->style->base_gc[GTK_STATE_SELECTED];
 822               else
 823                 gc = widget->style->text_gc[GTK_STATE_NORMAL];
 824
 825               gdk_gc_set_clip_rectangle (gc, &clip);
 826               gdk_draw_line (drawable, gc,
 827                              line_display->x_offset + cursor->x - x_offset,
 828                              current_y + line_display->top_margin + cursor->y,
 829                              line_display->x_offset + cursor->x - x_offset,
 830                              current_y + line_display->top_margin + cursor->y + cursor->height - 1);
 831               gdk_gc_set_clip_rectangle (gc, NULL);
 832
 833               cursor_list = cursor_list->next;
 834             }
 835         } /* line_display->height > 0 */
 836
 837       current_y += line_display->height;
 838       gtk_text_layout_free_line_display (layout, line_display);
 839       render_state->last_appearance = NULL;
 840       render_state->last_bg_appearance = NULL;
 841
 842       tmp_list = g_slist_next (tmp_list);
 843     }
 844
 845   gtk_text_layout_wrap_loop_end (layout);
 846   gtk_text_render_state_destroy (render_state);
 847
 848   g_slist_free (line_list);
 849 }