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   gdk_gc_unref (state->fg_gc);
 128   gdk_gc_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   if (!state->last_appearance ||
 147       !gdk_color_equal (&new_appearance->fg_color, &state->last_appearance->fg_color))
 148     gtk_text_render_state_set_color (state, state->fg_gc, &new_appearance->fg_color);
 149
 150   if (!state->last_appearance ||
 151       new_appearance->fg_stipple != state->last_appearance->fg_stipple)
 152     {
 153       if (new_appearance->fg_stipple)
 154         {
 155           gdk_gc_set_fill (state->fg_gc, GDK_STIPPLED);
 156           gdk_gc_set_stipple (state->fg_gc, new_appearance->fg_stipple);
 157         }
 158       else
 159         {
 160           gdk_gc_set_fill (state->fg_gc, GDK_SOLID);
 161         }
 162     }
 163
 164   if (new_appearance->draw_bg)
 165     {
 166       if (!state->last_bg_appearance ||
 167           !gdk_color_equal (&new_appearance->bg_color, &state->last_bg_appearance->bg_color))
 168         gtk_text_render_state_set_color (state, state->bg_gc, &new_appearance->bg_color);
 169
 170       if (!state->last_bg_appearance ||
 171           new_appearance->bg_stipple != state->last_bg_appearance->bg_stipple)
 172         {
 173           if (new_appearance->bg_stipple)
 174             {
 175               gdk_gc_set_fill (state->bg_gc, GDK_STIPPLED);
 176               gdk_gc_set_stipple (state->bg_gc, new_appearance->bg_stipple);
 177             }
 178           else
 179             {
 180               gdk_gc_set_fill (state->bg_gc, GDK_SOLID);
 181             }
 182         }
 183
 184       state->last_bg_appearance = new_appearance;
 185     }
 186
 187   state->last_appearance = new_appearance;
 188 }
 189
 190 static void
 191 get_shape_extents (PangoLayoutRun *run,
 192                    PangoRectangle *ink_rect,
 193                    PangoRectangle *logical_rect)
 194 {
 195   GSList *tmp_list = run->item->analysis.extra_attrs;
 196
 197   while (tmp_list)
 198     {
 199       PangoAttribute *attr = tmp_list->data;
 200
 201       if (attr->klass->type == PANGO_ATTR_SHAPE)
 202         {
 203           if (logical_rect)
 204             *logical_rect = ((PangoAttrShape *)attr)->logical_rect;
 205
 206           if (ink_rect)
 207             *ink_rect = ((PangoAttrShape *)attr)->ink_rect;
 208
 209           return;
 210         }
 211
 212       tmp_list = tmp_list->next;
 213     }
 214
 215   g_assert_not_reached ();
 216 }
 217
 218 static void
 219 render_layout_line (GdkDrawable        *drawable,
 220                     GtkTextRenderState *render_state,
 221                     PangoLayoutLine    *line,
 222                     GSList            **shaped_pointer,
 223                     int                 x,
 224                     int                 y,
 225                     gboolean            selected)
 226 {
 227   GSList *tmp_list = line->runs;
 228   PangoRectangle overall_rect;
 229   PangoRectangle logical_rect;
 230   PangoRectangle ink_rect;
 231   gint x_off = 0;
 232   GdkGC *fg_gc;
 233
 234   pango_layout_line_get_extents (line, NULL, &overall_rect);
 235
 236   while (tmp_list)
 237     {
 238       PangoLayoutRun *run = tmp_list->data;
 239       GtkTextAppearance *appearance;
 240       gint risen_y;
 241       gint shaped_width_pixels = 0;
 242       gboolean need_ink = FALSE;
 243
 244       tmp_list = tmp_list->next;
 245
 246       get_item_properties (run->item, &appearance);
 247
 248       g_assert (appearance != NULL);
 249
 250       risen_y = y - PANGO_PIXELS (appearance->rise);
 251
 252       if (selected)
 253         {
 254           if (GTK_WIDGET_HAS_FOCUS (render_state->widget))
 255             fg_gc = render_state->widget->style->text_gc[GTK_STATE_SELECTED];
 256           else
 257             fg_gc = render_state->widget->style->text_gc [GTK_STATE_ACTIVE];
 258         }
 259       else
 260         {
 261           gtk_text_render_state_update (render_state, appearance);
 262
 263           fg_gc = render_state->fg_gc;
 264         }
 265
 266       if (appearance->underline != PANGO_UNDERLINE_NONE ||
 267           appearance->strikethrough)
 268         need_ink = TRUE;
 269
 270       if (appearance->is_text)
 271         {
 272           if (need_ink)
 273             pango_glyph_string_extents (run->glyphs, run->item->analysis.font,
 274                                         &ink_rect, &logical_rect);
 275           else
 276             pango_glyph_string_extents (run->glyphs, run->item->analysis.font,
 277                                         NULL, &logical_rect);
 278         }
 279       else
 280         {
 281           if (need_ink)
 282             get_shape_extents (run, &ink_rect, &logical_rect);
 283           else
 284             get_shape_extents (run, NULL, &logical_rect);
 285         }
 286
 287       if (appearance->draw_bg && !selected)
 288         gdk_draw_rectangle (drawable, render_state->bg_gc, TRUE,
 289                             x + PANGO_PIXELS (x_off) + PANGO_PIXELS (logical_rect.x),
 290                             risen_y + PANGO_PIXELS (logical_rect.y),
 291                             PANGO_PIXELS (logical_rect.width),
 292                             PANGO_PIXELS (logical_rect.height));
 293
 294       if (appearance->is_text)
 295         gdk_draw_glyphs (drawable, fg_gc,
 296                          run->item->analysis.font,
 297                          x + PANGO_PIXELS (x_off),
 298                          risen_y, run->glyphs);
 299       else
 300         {
 301           GObject *shaped = (*shaped_pointer)->data;
 302
 303           *shaped_pointer = (*shaped_pointer)->next;
 304
 305           if (shaped == NULL)
 306             {
 307               /* This happens if we have an empty widget anchor. Draw
 308                * something empty-looking.
 309                */
 310               GdkRectangle shape_rect, draw_rect;
 311
 312               shape_rect.x = x + x_off / PANGO_SCALE;
 313               shape_rect.y = risen_y - PANGO_PIXELS (logical_rect.height);
 314               shape_rect.width = PANGO_PIXELS (logical_rect.width);
 315               shape_rect.height = PANGO_PIXELS (logical_rect.height);
 316
 317               if (gdk_rectangle_intersect (&shape_rect, &render_state->clip_rect,
 318                                            &draw_rect))
 319                 {
 320                   gdk_draw_rectangle (drawable, render_state->fg_gc,
 321                                       FALSE, shape_rect.x, shape_rect.y,
 322                                       shape_rect.width, shape_rect.height);
 323
 324                   gdk_draw_line (drawable, render_state->fg_gc,
 325                                  shape_rect.x, shape_rect.y,
 326                                  shape_rect.x + shape_rect.width,
 327                                  shape_rect.y + shape_rect.height);
 328
 329                   gdk_draw_line (drawable, render_state->fg_gc,
 330                                  shape_rect.x + shape_rect.width, shape_rect.y,
 331                                  shape_rect.x,
 332                                  shape_rect.y + shape_rect.height);
 333                 }
 334             }
 335           else if (GDK_IS_PIXBUF (shaped))
 336             {
 337               gint width, height;
 338               GdkRectangle pixbuf_rect, draw_rect;
 339               GdkPixbuf *pixbuf;
 340
 341               pixbuf = GDK_PIXBUF (shaped);
 342
 343               width = gdk_pixbuf_get_width (pixbuf);
 344               height = gdk_pixbuf_get_height (pixbuf);
 345
 346               pixbuf_rect.x = x + x_off / PANGO_SCALE;
 347               pixbuf_rect.y = risen_y - height;
 348               pixbuf_rect.width = width;
 349               pixbuf_rect.height = height;
 350
 351               if (gdk_rectangle_intersect (&pixbuf_rect, &render_state->clip_rect,
 352                                            &draw_rect))
 353                 {
 354                   GdkBitmap *mask = NULL;
 355
 356                   if (gdk_pixbuf_get_has_alpha (pixbuf))
 357                     {
 358                       mask = gdk_pixmap_new (drawable,
 359                                              gdk_pixbuf_get_width (pixbuf),
 360                                              gdk_pixbuf_get_height (pixbuf),
 361                                              1);
 362
 363                       gdk_pixbuf_render_threshold_alpha (pixbuf, mask,
 364                                                          0, 0, 0, 0,
 365                                                          gdk_pixbuf_get_width (pixbuf),
 366                                                          gdk_pixbuf_get_height (pixbuf),
 367                                                          128);
 368
 369                     }
 370
 371                   if (mask)
 372                     {
 373                       gdk_gc_set_clip_mask (render_state->fg_gc, mask);
 374                       gdk_gc_set_clip_origin (render_state->fg_gc,
 375                                               pixbuf_rect.x, pixbuf_rect.y);
 376                     }
 377
 378                   gdk_pixbuf_render_to_drawable (pixbuf,
 379                                                  drawable,
 380                                                  render_state->fg_gc,
 381                                                  draw_rect.x - pixbuf_rect.x,
 382                                                  draw_rect.y - pixbuf_rect.y,
 383                                                  draw_rect.x, draw_rect.y,
 384                                                  draw_rect.width,
 385                                                  draw_rect.height,
 386                                                  GDK_RGB_DITHER_NORMAL,
 387                                                  0, 0);
 388
 389                   if (mask)
 390                     {
 391                       gdk_gc_set_clip_rectangle (render_state->fg_gc,
 392                                                  &render_state->clip_rect);
 393                       g_object_unref (G_OBJECT (mask));
 394                     }
 395                 }
 396
 397               shaped_width_pixels = width;
 398             }
 399           else if (GTK_IS_WIDGET (shaped))
 400             {
 401               gint width, height;
 402               GdkRectangle draw_rect;
 403               GtkWidget *widget;
 404
 405               widget = GTK_WIDGET (shaped);
 406
 407               width = widget->allocation.width;
 408               height = widget->allocation.height;
 409
 410               g_print ("widget allocation at %d,%d %d x %d\n",
 411                        widget->allocation.x,
 412                        widget->allocation.y,
 413                        widget->allocation.width,
 414                        widget->allocation.height);
 415
 416               if (GTK_WIDGET_DRAWABLE (widget) &&
 417                   gdk_rectangle_intersect (&widget->allocation,
 418                                            &render_state->clip_rect,
 419                                            &draw_rect))
 420
 421                 {
 422                   g_print ("drawing widget area %d,%d %d x %d\n",
 423                            draw_rect.x,
 424                            draw_rect.y,
 425                            draw_rect.width,
 426                            draw_rect.height);
 427
 428                   gtk_widget_draw (widget, &draw_rect);
 429                 }
 430
 431               shaped_width_pixels = width;
 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 {
 495   GSList *shaped_pointer = line_display->shaped_objects;
 496   PangoLayout *layout = line_display->layout;
 497   int byte_offset = 0;
 498   PangoLayoutIter *iter;
 499   PangoRectangle layout_logical;
 500   int screen_width;
 501   GdkGC *fg_gc, *bg_gc;
 502   gint state;
 503
 504   gboolean first = TRUE;
 505
 506   iter = pango_layout_get_iter (layout);
 507
 508   pango_layout_iter_get_layout_extents (iter, NULL, &layout_logical);
 509
 510   /* Adjust for margins */
 511
 512   layout_logical.x += line_display->x_offset * PANGO_SCALE;
 513   layout_logical.y += line_display->top_margin * PANGO_SCALE;
 514
 515   screen_width = line_display->total_width;
 516
 517   if (GTK_WIDGET_HAS_FOCUS (render_state->widget))
 518     state = GTK_STATE_SELECTED;
 519   else
 520     state = GTK_STATE_ACTIVE;
 521
 522   fg_gc = render_state->widget->style->text_gc [state];
 523   bg_gc = render_state->widget->style->base_gc [state];
 524
 525   do
 526     {
 527       PangoLayoutLine *line = pango_layout_iter_get_line (iter);
 528       int selection_y, selection_height;
 529       int first_y, last_y;
 530       PangoRectangle line_rect;
 531       int baseline;
 532
 533       pango_layout_iter_get_line_extents (iter, NULL, &line_rect);
 534       baseline = pango_layout_iter_get_baseline (iter);
 535       pango_layout_iter_get_line_yrange (iter, &first_y, &last_y);
 536
 537       /* Adjust for margins */
 538
 539       line_rect.x += line_display->x_offset * PANGO_SCALE;
 540       line_rect.y += line_display->top_margin * PANGO_SCALE;
 541       baseline += line_display->top_margin * PANGO_SCALE;
 542
 543       /* Selection is the height of the line, plus top/bottom
 544        * margin if we're the first/last line
 545        */
 546       selection_y = y + PANGO_PIXELS (first_y) + line_display->top_margin;
 547       selection_height = PANGO_PIXELS (last_y) - PANGO_PIXELS (first_y);
 548
 549       if (first)
 550         {
 551           selection_y -= line_display->top_margin;
 552           selection_height += line_display->top_margin;
 553         }
 554
 555       if (pango_layout_iter_at_last_line (iter))
 556         selection_height += line_display->bottom_margin;
 557
 558       first = FALSE;
 559
 560       if (selection_start_index < byte_offset &&
 561           selection_end_index > line->length + byte_offset) /* All selected */
 562         {
 563           gdk_draw_rectangle (drawable,
 564                               bg_gc,
 565                               TRUE,
 566                               x + line_display->left_margin,
 567                               selection_y,
 568                               screen_width,
 569                               selection_height);
 570
 571           render_layout_line (drawable, render_state, line, &shaped_pointer,
 572                               x + PANGO_PIXELS (line_rect.x),
 573                               y + PANGO_PIXELS (baseline),
 574                               TRUE);
 575         }
 576       else
 577         {
 578           GSList *shaped_pointer_tmp = shaped_pointer;
 579
 580           render_layout_line (drawable, render_state,
 581                               line, &shaped_pointer,
 582                               x + PANGO_PIXELS (line_rect.x),
 583                               y + PANGO_PIXELS (baseline),
 584                               FALSE);
 585
 586           if (selection_start_index <= byte_offset + line->length &&
 587               selection_end_index > byte_offset) /* Some selected */
 588             {
 589               GdkRegion *clip_region = get_selected_clip (render_state, layout, line,
 590                                                           x + line_display->x_offset,
 591                                                           selection_y,
 592                                                           selection_height,
 593                                                           selection_start_index, selection_end_index);
 594               gdk_gc_set_clip_region (fg_gc, clip_region);
 595               gdk_gc_set_clip_region (bg_gc, clip_region);
 596
 597               gdk_draw_rectangle (drawable,
 598                                   bg_gc,
 599                                   TRUE,
 600                                   x + PANGO_PIXELS (line_rect.x),
 601                                   selection_y,
 602                                   PANGO_PIXELS (line_rect.width),
 603                                   selection_height);
 604
 605               render_layout_line (drawable, render_state, line, &shaped_pointer_tmp,
 606                                   x + PANGO_PIXELS (line_rect.x),
 607                                   y + PANGO_PIXELS (baseline),
 608                                   TRUE);
 609
 610               gdk_gc_set_clip_region (fg_gc, NULL);
 611               gdk_gc_set_clip_region (bg_gc, NULL);
 612
 613               gdk_region_destroy (clip_region);
 614
 615               /* Paint in the ends of the line */
 616               if (line_rect.x > line_display->left_margin * PANGO_SCALE &&
 617                   ((line_display->direction == GTK_TEXT_DIR_LTR && selection_start_index < byte_offset) ||
 618                    (line_display->direction == GTK_TEXT_DIR_RTL && selection_end_index > byte_offset + line->length)))
 619                 {
 620                   gdk_draw_rectangle (drawable,
 621                                       bg_gc,
 622                                       TRUE,
 623                                       x + line_display->left_margin,
 624                                       selection_y,
 625                                       PANGO_PIXELS (line_rect.x) - line_display->left_margin,
 626                                       selection_height);
 627                 }
 628
 629               if (line_rect.x + line_rect.width <
 630                   (screen_width + line_display->left_margin) * PANGO_SCALE &&
 631                   ((line_display->direction == GTK_TEXT_DIR_LTR && selection_end_index > byte_offset + line->length) ||
 632                    (line_display->direction == GTK_TEXT_DIR_RTL && selection_start_index < byte_offset)))
 633                 {
 634                   int nonlayout_width;
 635
 636                   nonlayout_width =
 637                     line_display->left_margin + screen_width -
 638                     PANGO_PIXELS (line_rect.x) - PANGO_PIXELS (line_rect.width);
 639
 640                   gdk_draw_rectangle (drawable,
 641                                       bg_gc,
 642                                       TRUE,
 643                                       x + PANGO_PIXELS (line_rect.x) + PANGO_PIXELS (line_rect.width),
 644                                       selection_y,
 645                                       nonlayout_width,
 646                                       selection_height);
 647                 }
 648             }
 649         }
 650
 651       byte_offset += line->length;
 652     }
 653   while (pango_layout_iter_next_line (iter));
 654
 655   pango_layout_iter_free (iter);
 656 }
 657
 658 static GdkRegion *
 659 get_selected_clip (GtkTextRenderState *render_state,
 660                    PangoLayout        *layout,
 661                    PangoLayoutLine    *line,
 662                    int                 x,
 663                    int                 y,
 664                    int                 height,
 665                    int                 start_index,
 666                    int                 end_index)
 667 {
 668   gint *ranges;
 669   gint n_ranges, i;
 670   GdkRegion *clip_region = gdk_region_new ();
 671   GdkRegion *tmp_region;
 672
 673   pango_layout_line_get_x_ranges (line, start_index, end_index, &ranges, &n_ranges);
 674
 675   for (i=0; i < n_ranges; i++)
 676     {
 677       GdkRectangle rect;
 678
 679       rect.x = x + PANGO_PIXELS (ranges[2*i]);
 680       rect.y = y;
 681       rect.width = PANGO_PIXELS (ranges[2*i + 1]) - PANGO_PIXELS (ranges[2*i]);
 682       rect.height = height;
 683
 684       gdk_region_union_with_rect (clip_region, &rect);
 685     }
 686
 687   tmp_region = gdk_region_rectangle (&render_state->clip_rect);
 688   gdk_region_intersect (clip_region, tmp_region);
 689   gdk_region_destroy (tmp_region);
 690
 691   g_free (ranges);
 692   return clip_region;
 693 }
 694
 695 static void
 696 get_item_properties (PangoItem          *item,
 697                      GtkTextAppearance **appearance)
 698 {
 699   GSList *tmp_list = item->analysis.extra_attrs;
 700
 701   *appearance = NULL;
 702
 703   while (tmp_list)
 704     {
 705       PangoAttribute *attr = tmp_list->data;
 706
 707       if (attr->klass->type == gtk_text_attr_appearance_type)
 708         {
 709           *appearance = &((GtkTextAttrAppearance *)attr)->appearance;
 710         }
 711
 712       tmp_list = tmp_list->next;
 713     }
 714 }
 715
 716 void
 717 gtk_text_layout_draw (GtkTextLayout *layout,
 718                       GtkWidget *widget,
 719                       GdkDrawable *drawable,
 720                       GdkGC       *cursor_gc,
 721                       /* Location of the drawable
 722                          in layout coordinates */
 723                       gint x_offset,
 724                       gint y_offset,
 725                       /* Region of the layout to
 726                          render */
 727                       gint x,
 728                       gint y,
 729                       gint width,
 730                       gint height)
 731 {
 732   GdkRectangle clip;
 733   gint current_y;
 734   GSList *cursor_list;
 735   GtkTextRenderState *render_state;
 736   GtkTextIter selection_start, selection_end;
 737   gboolean have_selection = FALSE;
 738   GSList *line_list;
 739   GSList *tmp_list;
 740
 741   g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
 742   g_return_if_fail (layout->default_style != NULL);
 743   g_return_if_fail (layout->buffer != NULL);
 744   g_return_if_fail (drawable != NULL);
 745   g_return_if_fail (width >= 0);
 746   g_return_if_fail (height >= 0);
 747
 748   if (width == 0 || height == 0)
 749     return;
 750
 751   line_list =  gtk_text_layout_get_lines (layout, y + y_offset, y + y_offset + height, &current_y);
 752   current_y -= y_offset;
 753
 754   if (line_list == NULL)
 755     return; /* nothing on the screen */
 756
 757   clip.x = x;
 758   clip.y = y;
 759   clip.width = width;
 760   clip.height = height;
 761
 762   render_state = gtk_text_render_state_new (widget, drawable, &clip);
 763
 764   gdk_gc_set_clip_rectangle (render_state->fg_gc, &clip);
 765   gdk_gc_set_clip_rectangle (render_state->bg_gc, &clip);
 766
 767   gtk_text_layout_wrap_loop_start (layout);
 768
 769   if (gtk_text_buffer_get_selection_bounds (layout->buffer,
 770                                             &selection_start,
 771                                             &selection_end))
 772     have_selection = TRUE;
 773
 774   tmp_list = line_list;
 775   while (tmp_list != NULL)
 776     {
 777       GtkTextLineDisplay *line_display;
 778       gint selection_start_index = -1;
 779       gint selection_end_index = -1;
 780       gboolean have_strong;
 781       gboolean have_weak;
 782
 783       GtkTextLine *line = tmp_list->data;
 784
 785       line_display = gtk_text_layout_get_line_display (layout, line, FALSE);
 786
 787       if (line_display->height > 0)
 788         {
 789           g_assert (line_display->layout != NULL);
 790
 791           if (have_selection)
 792             {
 793               GtkTextIter line_start, line_end;
 794               gint byte_count;
 795
 796               gtk_text_layout_get_iter_at_line (layout,
 797                                                 &line_start,
 798                                                 line, 0);
 799               byte_count = gtk_text_iter_get_bytes_in_line (&line_start);
 800
 801               /* FIXME the -1 assumes a newline I think */
 802               gtk_text_layout_get_iter_at_line (layout,
 803                                                 &line_end,
 804                                                 line, byte_count - 1);
 805
 806               if (gtk_text_iter_compare (&selection_start, &line_end) <= 0 &&
 807                   gtk_text_iter_compare (&selection_end, &line_start) >= 0)
 808                 {
 809                   if (gtk_text_iter_compare (&selection_start, &line_start) >= 0)
 810                     selection_start_index = gtk_text_iter_get_line_index (&selection_start);
 811                   else
 812                     selection_start_index = -1;
 813
 814                   if (gtk_text_iter_compare (&selection_end, &line_end) <= 0)
 815                     selection_end_index = gtk_text_iter_get_line_index (&selection_end);
 816                   else
 817                     selection_end_index = byte_count;
 818                 }
 819             }
 820
 821           render_para (drawable, render_state, line_display,
 822                        - x_offset,
 823                        current_y,
 824                        selection_start_index, selection_end_index);
 825
 826
 827           /* We paint the cursors last, because they overlap another chunk
 828          and need to appear on top. */
 829
 830           have_strong = FALSE;
 831           have_weak = FALSE;
 832
 833           cursor_list = line_display->cursors;
 834           while (cursor_list)
 835             {
 836               GtkTextCursorDisplay *cursor = cursor_list->data;
 837               if (cursor->is_strong)
 838                 have_strong = TRUE;
 839               else
 840                 have_weak = TRUE;
 841
 842               cursor_list = cursor_list->next;
 843             }
 844
 845           cursor_list = line_display->cursors;
 846           while (cursor_list)
 847             {
 848               GtkTextCursorDisplay *cursor = cursor_list->data;
 849               GtkTextDirection dir;
 850               GdkRectangle cursor_location;
 851
 852               GdkGC *gc;
 853
 854               if (cursor->is_strong)
 855                 gc = cursor_gc;
 856               else
 857                 gc = widget->style->text_gc[GTK_STATE_NORMAL];
 858
 859               if (have_strong && have_weak)
 860                 {
 861                   dir = line_display->direction;
 862                   if (!cursor->is_strong)
 863                     dir = (dir == GTK_TEXT_DIR_RTL) ? GTK_TEXT_DIR_LTR : GTK_TEXT_DIR_RTL;
 864                 }
 865               else
 866                 {
 867                   dir = GTK_TEXT_DIR_NONE;
 868                 }
 869
 870               cursor_location.x = line_display->x_offset + cursor->x - x_offset;
 871               cursor_location.y = current_y + line_display->top_margin + cursor->y;
 872               cursor_location.width = 0;
 873               cursor_location.height = cursor->height;
 874
 875               gdk_gc_set_clip_rectangle(gc, &clip);
 876               _gtk_draw_insertion_cursor (drawable, gc, &cursor_location, dir);
 877               gdk_gc_set_clip_rectangle (gc, NULL);
 878
 879               cursor_list = cursor_list->next;
 880             }
 881         } /* line_display->height > 0 */
 882
 883       current_y += line_display->height;
 884       gtk_text_layout_free_line_display (layout, line_display);
 885       render_state->last_appearance = NULL;
 886       render_state->last_bg_appearance = NULL;
 887
 888       tmp_list = g_slist_next (tmp_list);
 889     }
 890
 891   gtk_text_layout_wrap_loop_end (layout);
 892   gtk_text_render_state_destroy (render_state);
 893
 894   g_slist_free (line_list);
 895 }