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