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 #define GTK_TEXT_USE_INTERNAL_UNSUPPORTED_API
  78 #include "gtktextdisplay.h"
  79 /* DO NOT go putting private headers in here. This file should only
  80  * use the semi-public headers, as with gtktextview.c.
  81  */
  82
  83 #include <pango/pango.h>
  84
  85 typedef struct _GtkTextRenderState GtkTextRenderState;
  86
  87 struct _GtkTextRenderState
  88 {
  89   GtkWidget *widget;
  90
  91   GtkTextAppearance *last_appearance;
  92   GtkTextAppearance *last_bg_appearance;
  93   GdkGC *fg_gc;
  94   GdkGC *bg_gc;
  95   GdkRectangle clip_rect;
  96 };
  97
  98 static void       get_item_properties (PangoItem           *item,
  99                                        GtkTextAppearance  **appearance);
 100 static GdkRegion *get_selected_clip   (GtkTextRenderState  *render_state,
 101                                        PangoLayout         *layout,
 102                                        PangoLayoutLine     *line,
 103                                        int                  x,
 104                                        int                  y,
 105                                        int                  height,
 106                                        int                  start_index,
 107                                        int                  end_index);
 108
 109 static GtkTextRenderState *
 110 gtk_text_render_state_new (GtkWidget    *widget,
 111                            GdkDrawable  *drawable,
 112                            GdkRectangle *clip_rect)
 113 {
 114   GtkTextRenderState *state = g_new0 (GtkTextRenderState, 1);
 115
 116   state->widget = widget;
 117   state->fg_gc = gdk_gc_new (drawable);
 118   state->bg_gc = gdk_gc_new (drawable);
 119   state->clip_rect = *clip_rect;
 120
 121   return state;
 122 }
 123
 124 static void
 125 gtk_text_render_state_destroy (GtkTextRenderState *state)
 126 {
 127   g_object_unref (state->fg_gc);
 128   g_object_unref (state->bg_gc);
 129
 130   g_free (state);
 131 }
 132
 133 static void
 134 gtk_text_render_state_set_color (GtkTextRenderState *state,
 135                                  GdkGC              *gc,
 136                                  GdkColor           *color)
 137 {
 138   gdk_colormap_alloc_color (gtk_widget_get_colormap (state->widget), color, FALSE, TRUE);
 139   gdk_gc_set_foreground (gc, color);
 140 }
 141
 142 static void
 143 gtk_text_render_state_update (GtkTextRenderState *state,
 144                               GtkTextAppearance  *new_appearance)
 145 {
 146   GdkScreen *screen = gtk_widget_get_screen (state->widget);
 147
 148   if (!state->last_appearance ||
 149       !gdk_color_equal (&new_appearance->fg_color, &state->last_appearance->fg_color))
 150     gtk_text_render_state_set_color (state, state->fg_gc, &new_appearance->fg_color);
 151
 152   if (!state->last_appearance ||
 153       new_appearance->fg_stipple != state->last_appearance->fg_stipple)
 154     {
 155       if (new_appearance->fg_stipple)
 156         {
 157           if (screen == gdk_drawable_get_screen (new_appearance->fg_stipple))
 158             {
 159               gdk_gc_set_fill (state->fg_gc, GDK_STIPPLED);
 160               gdk_gc_set_stipple (state->fg_gc, new_appearance->fg_stipple);
 161             }
 162           else
 163             g_warning ("gtk_text_render_state_update:\n"
 164                        "The foreground stipple bitmap has been created on the wrong screen.\n"
 165                        "Ignoring the stipple bitmap information.");
 166         }
 167       else
 168         {
 169           gdk_gc_set_fill (state->fg_gc, GDK_SOLID);
 170         }
 171     }
 172
 173   if (new_appearance->draw_bg)
 174     {
 175       if (!state->last_bg_appearance ||
 176           !gdk_color_equal (&new_appearance->bg_color, &state->last_bg_appearance->bg_color))
 177         gtk_text_render_state_set_color (state, state->bg_gc, &new_appearance->bg_color);
 178
 179       if (!state->last_bg_appearance ||
 180           new_appearance->bg_stipple != state->last_bg_appearance->bg_stipple)
 181         {
 182           if (new_appearance->bg_stipple)
 183             {
 184               if (screen == gdk_drawable_get_screen (new_appearance->bg_stipple))
 185                 {
 186                   gdk_gc_set_fill (state->bg_gc, GDK_STIPPLED);
 187                   gdk_gc_set_stipple (state->bg_gc, new_appearance->bg_stipple);
 188                 }
 189               else
 190                 g_warning ("gtk_text_render_state_update:\n"
 191                            "The background stipple bitmap has been created on the wrong screen.\n"
 192                            "Ignoring the stipple bitmap information.");
 193
 194             }
 195           else
 196             {
 197               gdk_gc_set_fill (state->bg_gc, GDK_SOLID);
 198             }
 199         }
 200
 201       state->last_bg_appearance = new_appearance;
 202     }
 203
 204   state->last_appearance = new_appearance;
 205 }
 206
 207 static void
 208 get_shape_extents (PangoLayoutRun *run,
 209                    PangoRectangle *ink_rect,
 210                    PangoRectangle *logical_rect)
 211 {
 212   GSList *tmp_list = run->item->analysis.extra_attrs;
 213
 214   while (tmp_list)
 215     {
 216       PangoAttribute *attr = tmp_list->data;
 217
 218       if (attr->klass->type == PANGO_ATTR_SHAPE)
 219         {
 220           if (logical_rect)
 221             *logical_rect = ((PangoAttrShape *)attr)->logical_rect;
 222
 223           if (ink_rect)
 224             *ink_rect = ((PangoAttrShape *)attr)->ink_rect;
 225
 226           return;
 227         }
 228
 229       tmp_list = tmp_list->next;
 230     }
 231
 232   g_assert_not_reached ();
 233 }
 234
 235 static void
 236 render_layout_line (GdkDrawable        *drawable,
 237                     GtkTextRenderState *render_state,
 238                     PangoLayoutLine    *line,
 239                     GSList            **shaped_pointer,
 240                     int                 x,
 241                     int                 y,
 242                     gboolean            selected,
 243                     GList             **widgets)
 244 {
 245   GSList *tmp_list = line->runs;
 246   PangoRectangle overall_rect;
 247   PangoRectangle logical_rect;
 248   PangoRectangle ink_rect;
 249   gint x_off = 0;
 250   GdkGC *fg_gc;
 251
 252   pango_layout_line_get_extents (line, NULL, &overall_rect);
 253
 254   while (tmp_list)
 255     {
 256       PangoLayoutRun *run = tmp_list->data;
 257       GtkTextAppearance *appearance;
 258       gint risen_y;
 259       gint shaped_width_pixels = 0;
 260       gboolean need_ink = FALSE;
 261
 262       tmp_list = tmp_list->next;
 263
 264       get_item_properties (run->item, &appearance);
 265
 266       g_assert (appearance != NULL);
 267
 268       risen_y = y - PANGO_PIXELS (appearance->rise);
 269
 270       if (selected)
 271         {
 272           if (GTK_WIDGET_HAS_FOCUS (render_state->widget))
 273             fg_gc = render_state->widget->style->text_gc[GTK_STATE_SELECTED];
 274           else
 275             fg_gc = render_state->widget->style->text_gc [GTK_STATE_ACTIVE];
 276         }
 277       else
 278         {
 279           gtk_text_render_state_update (render_state, appearance);
 280
 281           fg_gc = render_state->fg_gc;
 282         }
 283
 284       if (appearance->underline != PANGO_UNDERLINE_NONE ||
 285           appearance->strikethrough)
 286         need_ink = TRUE;
 287
 288       if (appearance->is_text)
 289         {
 290           if (need_ink)
 291             pango_glyph_string_extents (run->glyphs, run->item->analysis.font,
 292                                         &ink_rect, &logical_rect);
 293           else
 294             pango_glyph_string_extents (run->glyphs, run->item->analysis.font,
 295                                         NULL, &logical_rect);
 296         }
 297       else
 298         {
 299           if (need_ink)
 300             get_shape_extents (run, &ink_rect, &logical_rect);
 301           else
 302             get_shape_extents (run, NULL, &logical_rect);
 303         }
 304
 305       if (appearance->draw_bg && !selected)
 306         gdk_draw_rectangle (drawable, render_state->bg_gc, TRUE,
 307                             x + PANGO_PIXELS (x_off) + PANGO_PIXELS (logical_rect.x),
 308                             risen_y + PANGO_PIXELS (logical_rect.y),
 309                             PANGO_PIXELS (logical_rect.width),
 310                             PANGO_PIXELS (logical_rect.height));
 311
 312       if (appearance->is_text)
 313         gdk_draw_glyphs (drawable, fg_gc,
 314                          run->item->analysis.font,
 315                          x + PANGO_PIXELS (x_off),
 316                          risen_y, run->glyphs);
 317       else
 318         {
 319           GObject *shaped = (*shaped_pointer)->data;
 320
 321           *shaped_pointer = (*shaped_pointer)->next;
 322
 323           if (shaped == NULL)
 324             {
 325               /* This happens if we have an empty widget anchor. Draw
 326                * something empty-looking.
 327                */
 328               GdkRectangle shape_rect, draw_rect;
 329
 330               shape_rect.x = x + x_off / PANGO_SCALE;
 331               shape_rect.y = risen_y - PANGO_PIXELS (logical_rect.height);
 332               shape_rect.width = PANGO_PIXELS (logical_rect.width);
 333               shape_rect.height = PANGO_PIXELS (logical_rect.height);
 334
 335               if (gdk_rectangle_intersect (&shape_rect, &render_state->clip_rect,
 336                                            &draw_rect))
 337                 {
 338                   gdk_draw_rectangle (drawable, render_state->fg_gc,
 339                                       FALSE, shape_rect.x, shape_rect.y,
 340                                       shape_rect.width, shape_rect.height);
 341
 342                   gdk_draw_line (drawable, render_state->fg_gc,
 343                                  shape_rect.x, shape_rect.y,
 344                                  shape_rect.x + shape_rect.width,
 345                                  shape_rect.y + shape_rect.height);
 346
 347                   gdk_draw_line (drawable, render_state->fg_gc,
 348                                  shape_rect.x + shape_rect.width, shape_rect.y,
 349                                  shape_rect.x,
 350                                  shape_rect.y + shape_rect.height);
 351                 }
 352
 353               shaped_width_pixels = shape_rect.width;
 354             }
 355           else if (GDK_IS_PIXBUF (shaped))
 356             {
 357               gint width, height;
 358               GdkRectangle pixbuf_rect, draw_rect;
 359               GdkPixbuf *pixbuf;
 360
 361               pixbuf = GDK_PIXBUF (shaped);
 362
 363               width = gdk_pixbuf_get_width (pixbuf);
 364               height = gdk_pixbuf_get_height (pixbuf);
 365
 366               pixbuf_rect.x = x + x_off / PANGO_SCALE;
 367               pixbuf_rect.y = risen_y - height;
 368               pixbuf_rect.width = width;
 369               pixbuf_rect.height = height;
 370
 371               if (gdk_rectangle_intersect (&pixbuf_rect, &render_state->clip_rect,
 372                                            &draw_rect))
 373                 {
 374                   GdkBitmap *mask = NULL;
 375
 376                   if (gdk_pixbuf_get_has_alpha (pixbuf))
 377                     {
 378                       mask = gdk_pixmap_new (drawable,
 379                                              gdk_pixbuf_get_width (pixbuf),
 380                                              gdk_pixbuf_get_height (pixbuf),
 381                                              1);
 382
 383                       gdk_pixbuf_render_threshold_alpha (pixbuf, mask,
 384                                                          0, 0, 0, 0,
 385                                                          gdk_pixbuf_get_width (pixbuf),
 386                                                          gdk_pixbuf_get_height (pixbuf),
 387                                                          128);
 388
 389                     }
 390
 391                   if (mask)
 392                     {
 393                       gdk_gc_set_clip_mask (render_state->fg_gc, mask);
 394                       gdk_gc_set_clip_origin (render_state->fg_gc,
 395                                               pixbuf_rect.x, pixbuf_rect.y);
 396                     }
 397
 398                   gdk_draw_pixbuf (drawable,
 399                                    render_state->fg_gc,
 400                                    pixbuf,
 401                                    draw_rect.x - pixbuf_rect.x,
 402                                    draw_rect.y - pixbuf_rect.y,
 403                                    draw_rect.x, draw_rect.y,
 404                                    draw_rect.width,
 405                                    draw_rect.height,
 406                                    GDK_RGB_DITHER_NORMAL,
 407                                    0, 0);
 408
 409                   if (mask)
 410                     {
 411                       gdk_gc_set_clip_rectangle (render_state->fg_gc,
 412                                                  &render_state->clip_rect);
 413                       g_object_unref (mask);
 414                     }
 415                 }
 416
 417               shaped_width_pixels = width;
 418             }
 419           else if (GTK_IS_WIDGET (shaped))
 420             {
 421               GtkWidget *widget;
 422
 423               widget = GTK_WIDGET (shaped);
 424
 425               shaped_width_pixels = widget->allocation.width;
 426
 427               if (widgets)
 428                 {
 429                   g_object_ref (widget);
 430                   *widgets = g_list_prepend (*widgets, widget);
 431                 }
 432             }
 433           else
 434             g_assert_not_reached (); /* not a pixbuf or widget */
 435         }
 436
 437       switch (appearance->underline)
 438         {
 439         case PANGO_UNDERLINE_NONE:
 440           break;
 441         case PANGO_UNDERLINE_DOUBLE:
 442           g_assert (need_ink);
 443           gdk_draw_line (drawable, fg_gc,
 444                          x + (x_off + ink_rect.x) / PANGO_SCALE - 1,
 445                          risen_y + 3,
 446                          x + (x_off + ink_rect.x + ink_rect.width) / PANGO_SCALE,
 447                          risen_y + 3);
 448           /* Fall through */
 449         case PANGO_UNDERLINE_SINGLE:
 450           g_assert (need_ink);
 451           gdk_draw_line (drawable, fg_gc,
 452                          x + (x_off + ink_rect.x) / PANGO_SCALE - 1,
 453                          risen_y + 1,
 454                          x + (x_off + ink_rect.x + ink_rect.width) / PANGO_SCALE,
 455                          risen_y + 1);
 456           break;
 457         case PANGO_UNDERLINE_LOW:
 458           g_assert (need_ink);
 459           gdk_draw_line (drawable, fg_gc,
 460                          x + (x_off + ink_rect.x) / PANGO_SCALE - 1,
 461                          risen_y + (ink_rect.y + ink_rect.height) / PANGO_SCALE + 1,
 462                          x + (x_off + ink_rect.x + ink_rect.width) / PANGO_SCALE,
 463                          risen_y + (ink_rect.y + ink_rect.height) / PANGO_SCALE + 1);
 464           break;
 465         }
 466
 467       if (appearance->strikethrough)
 468         {
 469           gint strikethrough_y = risen_y + (0.3 * logical_rect.y) / PANGO_SCALE;
 470
 471           g_assert (need_ink);
 472
 473           gdk_draw_line (drawable, fg_gc,
 474                          x + (x_off + ink_rect.x) / PANGO_SCALE - 1, strikethrough_y,
 475                          x + (x_off + ink_rect.x + ink_rect.width) / PANGO_SCALE, strikethrough_y);
 476         }
 477
 478       if (appearance->is_text)
 479         x_off += logical_rect.width;
 480       else
 481         x_off += shaped_width_pixels * PANGO_SCALE;
 482     }
 483 }
 484
 485 static void
 486 render_para (GdkDrawable        *drawable,
 487              GtkTextRenderState *render_state,
 488              GtkTextLineDisplay *line_display,
 489              /* Top-left corner of paragraph including all margins */
 490              int                 x,
 491              int                 y,
 492              int                 selection_start_index,
 493              int                 selection_end_index,
 494              GList             **widgets)
 495 {
 496   GSList *shaped_pointer = line_display->shaped_objects;
 497   PangoLayout *layout = line_display->layout;
 498   int byte_offset = 0;
 499   PangoLayoutIter *iter;
 500   PangoRectangle layout_logical;
 501   int screen_width;
 502   GdkGC *fg_gc, *bg_gc;
 503   gint state;
 504
 505   gboolean first = TRUE;
 506
 507   iter = pango_layout_get_iter (layout);
 508
 509   pango_layout_iter_get_layout_extents (iter, NULL, &layout_logical);
 510
 511   /* Adjust for margins */
 512
 513   layout_logical.x += line_display->x_offset * PANGO_SCALE;
 514   layout_logical.y += line_display->top_margin * PANGO_SCALE;
 515
 516   screen_width = line_display->total_width;
 517
 518   if (GTK_WIDGET_HAS_FOCUS (render_state->widget))
 519     state = GTK_STATE_SELECTED;
 520   else
 521     state = GTK_STATE_ACTIVE;
 522
 523   fg_gc = render_state->widget->style->text_gc [state];
 524   bg_gc = render_state->widget->style->base_gc [state];
 525
 526   do
 527     {
 528       PangoLayoutLine *line = pango_layout_iter_get_line (iter);
 529       int selection_y, selection_height;
 530       int first_y, last_y;
 531       PangoRectangle line_rect;
 532       int baseline;
 533
 534       pango_layout_iter_get_line_extents (iter, NULL, &line_rect);
 535       baseline = pango_layout_iter_get_baseline (iter);
 536       pango_layout_iter_get_line_yrange (iter, &first_y, &last_y);
 537
 538       /* Adjust for margins */
 539
 540       line_rect.x += line_display->x_offset * PANGO_SCALE;
 541       line_rect.y += line_display->top_margin * PANGO_SCALE;
 542       baseline += line_display->top_margin * PANGO_SCALE;
 543
 544       /* Selection is the height of the line, plus top/bottom
 545        * margin if we're the first/last line
 546        */
 547       selection_y = y + PANGO_PIXELS (first_y) + line_display->top_margin;
 548       selection_height = PANGO_PIXELS (last_y) - PANGO_PIXELS (first_y);
 549
 550       if (first)
 551         {
 552           selection_y -= line_display->top_margin;
 553           selection_height += line_display->top_margin;
 554         }
 555
 556       if (pango_layout_iter_at_last_line (iter))
 557         selection_height += line_display->bottom_margin;
 558
 559       first = FALSE;
 560
 561       if (selection_start_index < byte_offset &&
 562           selection_end_index > line->length + byte_offset) /* All selected */
 563         {
 564           gdk_draw_rectangle (drawable,
 565                               bg_gc,
 566                               TRUE,
 567                               x + line_display->left_margin,
 568                               selection_y,
 569                               screen_width,
 570                               selection_height);
 571
 572           render_layout_line (drawable, render_state, line, &shaped_pointer,
 573                               x + PANGO_PIXELS (line_rect.x),
 574                               y + PANGO_PIXELS (baseline),
 575                               TRUE,
 576                               widgets);
 577         }
 578       else
 579         {
 580           GSList *shaped_pointer_tmp = shaped_pointer;
 581
 582           render_layout_line (drawable, render_state,
 583                               line, &shaped_pointer,
 584                               x + PANGO_PIXELS (line_rect.x),
 585                               y + PANGO_PIXELS (baseline),
 586                               FALSE,
 587                               widgets);
 588
 589           if (selection_start_index <= byte_offset + line->length &&
 590               selection_end_index > byte_offset) /* Some selected */
 591             {
 592               GdkRegion *clip_region = get_selected_clip (render_state, layout, line,
 593                                                           x + line_display->x_offset,
 594                                                           selection_y,
 595                                                           selection_height,
 596                                                           selection_start_index, selection_end_index);
 597               gdk_gc_set_clip_region (fg_gc, clip_region);
 598               gdk_gc_set_clip_region (bg_gc, clip_region);
 599
 600               gdk_draw_rectangle (drawable,
 601                                   bg_gc,
 602                                   TRUE,
 603                                   x + PANGO_PIXELS (line_rect.x),
 604                                   selection_y,
 605                                   PANGO_PIXELS (line_rect.width),
 606                                   selection_height);
 607
 608               render_layout_line (drawable, render_state, line, &shaped_pointer_tmp,
 609                                   x + PANGO_PIXELS (line_rect.x),
 610                                   y + PANGO_PIXELS (baseline),
 611                                   TRUE,
 612                                   widgets);
 613
 614               gdk_gc_set_clip_region (fg_gc, NULL);
 615               gdk_gc_set_clip_region (bg_gc, NULL);
 616
 617               gdk_region_destroy (clip_region);
 618
 619               /* Paint in the ends of the line */
 620               if (line_rect.x > line_display->left_margin * PANGO_SCALE &&
 621                   ((line_display->direction == GTK_TEXT_DIR_LTR && selection_start_index < byte_offset) ||
 622                    (line_display->direction == GTK_TEXT_DIR_RTL && selection_end_index > byte_offset + line->length)))
 623                 {
 624                   gdk_draw_rectangle (drawable,
 625                                       bg_gc,
 626                                       TRUE,
 627                                       x + line_display->left_margin,
 628                                       selection_y,
 629                                       PANGO_PIXELS (line_rect.x) - line_display->left_margin,
 630                                       selection_height);
 631                 }
 632
 633               if (line_rect.x + line_rect.width <
 634                   (screen_width + line_display->left_margin) * PANGO_SCALE &&
 635                   ((line_display->direction == GTK_TEXT_DIR_LTR && selection_end_index > byte_offset + line->length) ||
 636                    (line_display->direction == GTK_TEXT_DIR_RTL && selection_start_index < byte_offset)))
 637                 {
 638                   int nonlayout_width;
 639
 640                   nonlayout_width =
 641                     line_display->left_margin + screen_width -
 642                     PANGO_PIXELS (line_rect.x) - PANGO_PIXELS (line_rect.width);
 643
 644                   gdk_draw_rectangle (drawable,
 645                                       bg_gc,
 646                                       TRUE,
 647                                       x + PANGO_PIXELS (line_rect.x) + PANGO_PIXELS (line_rect.width),
 648                                       selection_y,
 649                                       nonlayout_width,
 650                                       selection_height);
 651                 }
 652             }
 653         }
 654
 655       byte_offset += line->length;
 656     }
 657   while (pango_layout_iter_next_line (iter));
 658
 659   pango_layout_iter_free (iter);
 660 }
 661
 662 static GdkRegion *
 663 get_selected_clip (GtkTextRenderState *render_state,
 664                    PangoLayout        *layout,
 665                    PangoLayoutLine    *line,
 666                    int                 x,
 667                    int                 y,
 668                    int                 height,
 669                    int                 start_index,
 670                    int                 end_index)
 671 {
 672   gint *ranges;
 673   gint n_ranges, i;
 674   GdkRegion *clip_region = gdk_region_new ();
 675   GdkRegion *tmp_region;
 676
 677   pango_layout_line_get_x_ranges (line, start_index, end_index, &ranges, &n_ranges);
 678
 679   for (i=0; i < n_ranges; i++)
 680     {
 681       GdkRectangle rect;
 682
 683       rect.x = x + PANGO_PIXELS (ranges[2*i]);
 684       rect.y = y;
 685       rect.width = PANGO_PIXELS (ranges[2*i + 1]) - PANGO_PIXELS (ranges[2*i]);
 686       rect.height = height;
 687
 688       gdk_region_union_with_rect (clip_region, &rect);
 689     }
 690
 691   tmp_region = gdk_region_rectangle (&render_state->clip_rect);
 692   gdk_region_intersect (clip_region, tmp_region);
 693   gdk_region_destroy (tmp_region);
 694
 695   g_free (ranges);
 696   return clip_region;
 697 }
 698
 699 static void
 700 get_item_properties (PangoItem          *item,
 701                      GtkTextAppearance **appearance)
 702 {
 703   GSList *tmp_list = item->analysis.extra_attrs;
 704
 705   *appearance = NULL;
 706
 707   while (tmp_list)
 708     {
 709       PangoAttribute *attr = tmp_list->data;
 710
 711       if (attr->klass->type == gtk_text_attr_appearance_type)
 712         {
 713           *appearance = &((GtkTextAttrAppearance *)attr)->appearance;
 714         }
 715
 716       tmp_list = tmp_list->next;
 717     }
 718 }
 719
 720 void
 721 gtk_text_layout_draw (GtkTextLayout *layout,
 722                       GtkWidget *widget,
 723                       GdkDrawable *drawable,
 724                       GdkGC       *cursor_gc,
 725                       /* Location of the drawable
 726                          in layout coordinates */
 727                       gint x_offset,
 728                       gint y_offset,
 729                       /* Region of the layout to
 730                          render */
 731                       gint x,
 732                       gint y,
 733                       gint width,
 734                       gint height,
 735                       /* widgets to expose */
 736                       GList **widgets)
 737 {
 738   GdkRectangle clip;
 739   gint current_y;
 740   GSList *cursor_list;
 741   GtkTextRenderState *render_state;
 742   GtkTextIter selection_start, selection_end;
 743   gboolean have_selection = FALSE;
 744   GSList *line_list;
 745   GSList *tmp_list;
 746
 747   g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
 748   g_return_if_fail (layout->default_style != NULL);
 749   g_return_if_fail (layout->buffer != NULL);
 750   g_return_if_fail (drawable != NULL);
 751   g_return_if_fail (width >= 0);
 752   g_return_if_fail (height >= 0);
 753
 754   if (width == 0 || height == 0)
 755     return;
 756
 757   line_list =  gtk_text_layout_get_lines (layout, y + y_offset, y + y_offset + height, &current_y);
 758   current_y -= y_offset;
 759
 760   if (line_list == NULL)
 761     return; /* nothing on the screen */
 762
 763   clip.x = x;
 764   clip.y = y;
 765   clip.width = width;
 766   clip.height = height;
 767
 768   render_state = gtk_text_render_state_new (widget, drawable, &clip);
 769
 770   gdk_gc_set_clip_rectangle (render_state->fg_gc, &clip);
 771   gdk_gc_set_clip_rectangle (render_state->bg_gc, &clip);
 772
 773   gtk_text_layout_wrap_loop_start (layout);
 774
 775   if (gtk_text_buffer_get_selection_bounds (layout->buffer,
 776                                             &selection_start,
 777                                             &selection_end))
 778     have_selection = TRUE;
 779
 780   tmp_list = line_list;
 781   while (tmp_list != NULL)
 782     {
 783       GtkTextLineDisplay *line_display;
 784       gint selection_start_index = -1;
 785       gint selection_end_index = -1;
 786       gboolean have_strong;
 787       gboolean have_weak;
 788
 789       GtkTextLine *line = tmp_list->data;
 790
 791       line_display = gtk_text_layout_get_line_display (layout, line, FALSE);
 792
 793       if (line_display->height > 0)
 794         {
 795           g_assert (line_display->layout != NULL);
 796
 797           if (have_selection)
 798             {
 799               GtkTextIter line_start, line_end;
 800               gint byte_count;
 801
 802               gtk_text_layout_get_iter_at_line (layout,
 803                                                 &line_start,
 804                                                 line, 0);
 805               line_end = line_start;
 806               gtk_text_iter_forward_to_line_end (&line_end);
 807               byte_count = gtk_text_iter_get_line_index (&line_end);
 808
 809               if (gtk_text_iter_compare (&selection_start, &line_end) <= 0 &&
 810                   gtk_text_iter_compare (&selection_end, &line_start) >= 0)
 811                 {
 812                   if (gtk_text_iter_compare (&selection_start, &line_start) >= 0)
 813                     selection_start_index = gtk_text_iter_get_line_index (&selection_start);
 814                   else
 815                     selection_start_index = -1;
 816
 817                   if (gtk_text_iter_compare (&selection_end, &line_end) <= 0)
 818                     selection_end_index = gtk_text_iter_get_line_index (&selection_end);
 819                   else
 820                     selection_end_index = byte_count;
 821                 }
 822             }
 823
 824           render_para (drawable, render_state, line_display,
 825                        - x_offset,
 826                        current_y,
 827                        selection_start_index, selection_end_index,
 828                        widgets);
 829
 830           /* We paint the cursors last, because they overlap another chunk
 831          and need to appear on top. */
 832
 833           have_strong = FALSE;
 834           have_weak = FALSE;
 835
 836           cursor_list = line_display->cursors;
 837           while (cursor_list)
 838             {
 839               GtkTextCursorDisplay *cursor = cursor_list->data;
 840               if (cursor->is_strong)
 841                 have_strong = TRUE;
 842               else
 843                 have_weak = TRUE;
 844
 845               cursor_list = cursor_list->next;
 846             }
 847
 848           cursor_list = line_display->cursors;
 849           while (cursor_list)
 850             {
 851               GtkTextCursorDisplay *cursor = cursor_list->data;
 852               GtkTextDirection dir;
 853               GdkRectangle cursor_location;
 854               GdkGC *gc;
 855
 856               dir = line_display->direction;
 857               if (have_strong && have_weak)
 858                 {
 859                   if (!cursor->is_strong)
 860                     dir = (dir == GTK_TEXT_DIR_RTL) ? GTK_TEXT_DIR_LTR : GTK_TEXT_DIR_RTL;
 861                 }
 862
 863               cursor_location.x = line_display->x_offset + cursor->x - x_offset;
 864               cursor_location.y = current_y + line_display->top_margin + cursor->y;
 865               cursor_location.width = 0;
 866               cursor_location.height = cursor->height;
 867
 868               gc = _gtk_get_insertion_cursor_gc (widget, cursor->is_strong);
 869               gdk_gc_set_clip_rectangle(gc, &clip);
 870               _gtk_draw_insertion_cursor (widget, drawable, gc, &cursor_location,
 871                                           dir, have_strong && have_weak);
 872               gdk_gc_set_clip_rectangle (gc, NULL);
 873
 874               g_object_unref (gc);
 875
 876               cursor_list = cursor_list->next;
 877             }
 878         } /* line_display->height > 0 */
 879
 880       current_y += line_display->height;
 881       gtk_text_layout_free_line_display (layout, line_display);
 882       render_state->last_appearance = NULL;
 883       render_state->last_bg_appearance = NULL;
 884
 885       tmp_list = g_slist_next (tmp_list);
 886     }
 887
 888   gtk_text_layout_wrap_loop_end (layout);
 889   gtk_text_render_state_destroy (render_state);
 890
 891   g_slist_free (line_list);
 892 }