1 /* gtktextdisplay.c - display layed-out text
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
8 * This file can be used under your choice of two licenses, the LGPL
9 * and the original Tk license.
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.
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.
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.
27 * Original Tk license:
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.
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.
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.
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.
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.
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/.
77 #define GTK_TEXT_USE_INTERNAL_UNSUPPORTED_API
79 #include "gtktextdisplay.h"
80 #include "gtkwidgetprivate.h"
81 #include "gtkstylecontextprivate.h"
84 /* DO NOT go putting private headers in here. This file should only
85 * use the semi-public headers, as with gtktextview.c.
88 #define GTK_TYPE_TEXT_RENDERER (_gtk_text_renderer_get_type())
89 #define GTK_TEXT_RENDERER(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), GTK_TYPE_TEXT_RENDERER, GtkTextRenderer))
90 #define GTK_IS_TEXT_RENDERER(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), GTK_TYPE_TEXT_RENDERER))
91 #define GTK_TEXT_RENDERER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GTK_TYPE_TEXT_RENDERER, GtkTextRendererClass))
92 #define GTK_IS_TEXT_RENDERER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GTK_TYPE_TEXT_RENDERER))
93 #define GTK_TEXT_RENDERER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_TEXT_RENDERER, GtkTextRendererClass))
95 typedef struct _GtkTextRenderer GtkTextRenderer;
96 typedef struct _GtkTextRendererClass GtkTextRendererClass;
104 struct _GtkTextRenderer
106 PangoRenderer parent_instance;
111 GdkRGBA *error_color; /* Error underline color for this widget */
112 GList *widgets; /* widgets encountered when drawing */
120 struct _GtkTextRendererClass
122 PangoRendererClass parent_class;
125 G_DEFINE_TYPE (GtkTextRenderer, _gtk_text_renderer, PANGO_TYPE_RENDERER)
128 text_renderer_set_rgba (GtkTextRenderer *text_renderer,
129 PangoRenderPart part,
132 PangoRenderer *renderer = PANGO_RENDERER (text_renderer);
133 PangoColor dummy = { 0, };
137 text_renderer->rgba[part] = *rgba;
138 pango_renderer_set_color (renderer, part, &dummy);
141 pango_renderer_set_color (renderer, part, NULL);
143 text_renderer->rgba_set[part] = (rgba != NULL);
146 static GtkTextAppearance *
147 get_item_appearance (PangoItem *item)
149 GSList *tmp_list = item->analysis.extra_attrs;
153 PangoAttribute *attr = tmp_list->data;
155 if (attr->klass->type == gtk_text_attr_appearance_type)
156 return &((GtkTextAttrAppearance *)attr)->appearance;
158 tmp_list = tmp_list->next;
165 gtk_text_renderer_prepare_run (PangoRenderer *renderer,
168 GtkStyleContext *context;
170 GtkTextRenderer *text_renderer = GTK_TEXT_RENDERER (renderer);
171 GdkRGBA *bg_rgba = NULL;
172 GdkRGBA *fg_rgba = NULL;
173 GtkTextAppearance *appearance;
175 PANGO_RENDERER_CLASS (_gtk_text_renderer_parent_class)->prepare_run (renderer, run);
177 appearance = get_item_appearance (run->item);
178 g_assert (appearance != NULL);
180 context = gtk_widget_get_style_context (text_renderer->widget);
181 state = gtk_widget_get_state_flags (text_renderer->widget);
183 if (appearance->draw_bg && text_renderer->state == NORMAL)
184 bg_rgba = appearance->rgba[0];
188 text_renderer_set_rgba (text_renderer, PANGO_RENDER_PART_BACKGROUND, bg_rgba);
190 if (text_renderer->state == SELECTED)
192 state |= GTK_STATE_FLAG_SELECTED;
194 gtk_style_context_get (context, state, "color", &fg_rgba, NULL);
196 else if (text_renderer->state == CURSOR && gtk_widget_has_focus (text_renderer->widget))
198 gtk_style_context_get (context, state,
199 "background-color", &fg_rgba,
203 fg_rgba = appearance->rgba[1];
205 text_renderer_set_rgba (text_renderer, PANGO_RENDER_PART_FOREGROUND, fg_rgba);
206 text_renderer_set_rgba (text_renderer, PANGO_RENDER_PART_STRIKETHROUGH, fg_rgba);
208 if (appearance->underline == PANGO_UNDERLINE_ERROR)
210 if (!text_renderer->error_color)
212 GdkColor *color = NULL;
214 gtk_style_context_get_style (context,
215 "error-underline-color", &color,
222 rgba.red = color->red / 65535.;
223 rgba.green = color->green / 65535.;
224 rgba.blue = color->blue / 65535.;
226 gdk_color_free (color);
228 text_renderer->error_color = gdk_rgba_copy (&rgba);
232 static const GdkRGBA red = { 1, 0, 0, 1 };
233 text_renderer->error_color = gdk_rgba_copy (&red);
237 text_renderer_set_rgba (text_renderer, PANGO_RENDER_PART_UNDERLINE, text_renderer->error_color);
240 text_renderer_set_rgba (text_renderer, PANGO_RENDER_PART_UNDERLINE, fg_rgba);
242 if (fg_rgba != appearance->rgba[1])
243 gdk_rgba_free (fg_rgba);
247 set_color (GtkTextRenderer *text_renderer,
248 PangoRenderPart part)
250 cairo_save (text_renderer->cr);
252 if (text_renderer->rgba_set[part])
253 gdk_cairo_set_source_rgba (text_renderer->cr, &text_renderer->rgba[part]);
257 unset_color (GtkTextRenderer *text_renderer)
259 cairo_restore (text_renderer->cr);
263 gtk_text_renderer_draw_glyphs (PangoRenderer *renderer,
265 PangoGlyphString *glyphs,
269 GtkTextRenderer *text_renderer = GTK_TEXT_RENDERER (renderer);
271 set_color (text_renderer, PANGO_RENDER_PART_FOREGROUND);
273 cairo_move_to (text_renderer->cr, (double)x / PANGO_SCALE, (double)y / PANGO_SCALE);
274 pango_cairo_show_glyph_string (text_renderer->cr, font, glyphs);
276 unset_color (text_renderer);
280 gtk_text_renderer_draw_glyph_item (PangoRenderer *renderer,
282 PangoGlyphItem *glyph_item,
286 GtkTextRenderer *text_renderer = GTK_TEXT_RENDERER (renderer);
288 set_color (text_renderer, PANGO_RENDER_PART_FOREGROUND);
290 cairo_move_to (text_renderer->cr, (double)x / PANGO_SCALE, (double)y / PANGO_SCALE);
291 pango_cairo_show_glyph_item (text_renderer->cr, text, glyph_item);
293 unset_color (text_renderer);
297 gtk_text_renderer_draw_rectangle (PangoRenderer *renderer,
298 PangoRenderPart part,
304 GtkTextRenderer *text_renderer = GTK_TEXT_RENDERER (renderer);
306 set_color (text_renderer, part);
308 cairo_rectangle (text_renderer->cr,
309 (double)x / PANGO_SCALE, (double)y / PANGO_SCALE,
310 (double)width / PANGO_SCALE, (double)height / PANGO_SCALE);
311 cairo_fill (text_renderer->cr);
313 unset_color (text_renderer);
317 gtk_text_renderer_draw_trapezoid (PangoRenderer *renderer,
318 PangoRenderPart part,
326 GtkTextRenderer *text_renderer = GTK_TEXT_RENDERER (renderer);
328 cairo_matrix_t matrix;
330 set_color (text_renderer, part);
332 cr = text_renderer->cr;
334 cairo_get_matrix (cr, &matrix);
335 matrix.xx = matrix.yy = 1.0;
336 matrix.xy = matrix.yx = 0.0;
337 cairo_set_matrix (cr, &matrix);
339 cairo_move_to (cr, x11, y1_);
340 cairo_line_to (cr, x21, y1_);
341 cairo_line_to (cr, x22, y2);
342 cairo_line_to (cr, x12, y2);
343 cairo_close_path (cr);
347 unset_color (text_renderer);
351 gtk_text_renderer_draw_error_underline (PangoRenderer *renderer,
357 GtkTextRenderer *text_renderer = GTK_TEXT_RENDERER (renderer);
359 set_color (text_renderer, PANGO_RENDER_PART_UNDERLINE);
361 pango_cairo_show_error_underline (text_renderer->cr,
362 (double)x / PANGO_SCALE, (double)y / PANGO_SCALE,
363 (double)width / PANGO_SCALE, (double)height / PANGO_SCALE);
365 unset_color (text_renderer);
369 gtk_text_renderer_draw_shape (PangoRenderer *renderer,
370 PangoAttrShape *attr,
374 GtkTextRenderer *text_renderer = GTK_TEXT_RENDERER (renderer);
376 if (attr->data == NULL)
378 /* This happens if we have an empty widget anchor. Draw
379 * something empty-looking.
381 GdkRectangle shape_rect;
384 shape_rect.x = PANGO_PIXELS (x);
385 shape_rect.y = PANGO_PIXELS (y + attr->logical_rect.y);
386 shape_rect.width = PANGO_PIXELS (x + attr->logical_rect.width) - shape_rect.x;
387 shape_rect.height = PANGO_PIXELS (y + attr->logical_rect.y + attr->logical_rect.height) - shape_rect.y;
389 set_color (text_renderer, PANGO_RENDER_PART_FOREGROUND);
391 cr = text_renderer->cr;
393 cairo_set_line_width (cr, 1.0);
396 shape_rect.x + 0.5, shape_rect.y + 0.5,
397 shape_rect.width - 1, shape_rect.height - 1);
398 cairo_move_to (cr, shape_rect.x + 0.5, shape_rect.y + 0.5);
400 shape_rect.x + shape_rect.width - 0.5,
401 shape_rect.y + shape_rect.height - 0.5);
402 cairo_move_to (cr, shape_rect.x + 0.5,
403 shape_rect.y + shape_rect.height - 0.5);
404 cairo_line_to (cr, shape_rect.x + shape_rect.width - 0.5,
409 unset_color (text_renderer);
411 else if (GDK_IS_PIXBUF (attr->data))
413 cairo_t *cr = text_renderer->cr;
414 GdkPixbuf *pixbuf = GDK_PIXBUF (attr->data);
418 gdk_cairo_set_source_pixbuf (cr, pixbuf,
420 PANGO_PIXELS (y) - gdk_pixbuf_get_height (pixbuf));
425 else if (GTK_IS_WIDGET (attr->data))
429 widget = GTK_WIDGET (attr->data);
431 text_renderer->widgets = g_list_prepend (text_renderer->widgets,
432 g_object_ref (widget));
435 g_assert_not_reached (); /* not a pixbuf or widget */
439 gtk_text_renderer_finalize (GObject *object)
441 G_OBJECT_CLASS (_gtk_text_renderer_parent_class)->finalize (object);
445 _gtk_text_renderer_init (GtkTextRenderer *renderer)
450 _gtk_text_renderer_class_init (GtkTextRendererClass *klass)
452 GObjectClass *object_class = G_OBJECT_CLASS (klass);
454 PangoRendererClass *renderer_class = PANGO_RENDERER_CLASS (klass);
456 renderer_class->prepare_run = gtk_text_renderer_prepare_run;
457 renderer_class->draw_glyphs = gtk_text_renderer_draw_glyphs;
458 renderer_class->draw_glyph_item = gtk_text_renderer_draw_glyph_item;
459 renderer_class->draw_rectangle = gtk_text_renderer_draw_rectangle;
460 renderer_class->draw_trapezoid = gtk_text_renderer_draw_trapezoid;
461 renderer_class->draw_error_underline = gtk_text_renderer_draw_error_underline;
462 renderer_class->draw_shape = gtk_text_renderer_draw_shape;
464 object_class->finalize = gtk_text_renderer_finalize;
468 text_renderer_set_state (GtkTextRenderer *text_renderer,
471 text_renderer->state = state;
475 text_renderer_begin (GtkTextRenderer *text_renderer,
479 GtkStyleContext *context;
483 text_renderer->widget = widget;
484 text_renderer->cr = cr;
486 context = gtk_widget_get_style_context (widget);
488 gtk_style_context_save (context);
489 gtk_style_context_add_class (context, GTK_STYLE_CLASS_VIEW);
491 state = gtk_widget_get_state_flags (widget);
492 gtk_style_context_get_color (context, state, &color);
496 gdk_cairo_set_source_rgba (cr, &color);
499 /* Returns a GSList of (referenced) widgets encountered while drawing.
502 text_renderer_end (GtkTextRenderer *text_renderer)
504 GtkStyleContext *context;
505 GList *widgets = text_renderer->widgets;
507 cairo_restore (text_renderer->cr);
509 context = gtk_widget_get_style_context (text_renderer->widget);
511 gtk_style_context_restore (context);
513 text_renderer->widget = NULL;
514 text_renderer->cr = NULL;
516 text_renderer->widgets = NULL;
518 if (text_renderer->error_color)
520 gdk_rgba_free (text_renderer->error_color);
521 text_renderer->error_color = NULL;
527 static cairo_region_t *
528 get_selected_clip (GtkTextRenderer *text_renderer,
530 PangoLayoutLine *line,
539 cairo_region_t *clip_region = cairo_region_create ();
541 pango_layout_line_get_x_ranges (line, start_index, end_index, &ranges, &n_ranges);
543 for (i=0; i < n_ranges; i++)
547 rect.x = x + PANGO_PIXELS (ranges[2*i]);
549 rect.width = PANGO_PIXELS (ranges[2*i + 1]) - PANGO_PIXELS (ranges[2*i]);
550 rect.height = height;
552 cairo_region_union_rectangle (clip_region, &rect);
560 render_para (GtkTextRenderer *text_renderer,
561 GtkTextLineDisplay *line_display,
562 int selection_start_index,
563 int selection_end_index)
565 GtkStyleContext *context;
567 PangoLayout *layout = line_display->layout;
569 PangoLayoutIter *iter;
570 PangoRectangle layout_logical;
573 gboolean first = TRUE;
575 iter = pango_layout_get_iter (layout);
577 pango_layout_iter_get_layout_extents (iter, NULL, &layout_logical);
579 /* Adjust for margins */
581 layout_logical.x += line_display->x_offset * PANGO_SCALE;
582 layout_logical.y += line_display->top_margin * PANGO_SCALE;
584 screen_width = line_display->total_width;
586 context = gtk_widget_get_style_context (text_renderer->widget);
587 state = gtk_widget_get_state_flags (text_renderer->widget);
589 state |= GTK_STATE_FLAG_SELECTED;
591 gtk_style_context_get_background_color (context, state, &selection);
595 PangoLayoutLine *line = pango_layout_iter_get_line_readonly (iter);
596 int selection_y, selection_height;
598 PangoRectangle line_rect;
600 gboolean at_last_line;
602 pango_layout_iter_get_line_extents (iter, NULL, &line_rect);
603 baseline = pango_layout_iter_get_baseline (iter);
604 pango_layout_iter_get_line_yrange (iter, &first_y, &last_y);
606 /* Adjust for margins */
608 line_rect.x += line_display->x_offset * PANGO_SCALE;
609 line_rect.y += line_display->top_margin * PANGO_SCALE;
610 baseline += line_display->top_margin * PANGO_SCALE;
612 /* Selection is the height of the line, plus top/bottom
613 * margin if we're the first/last line
615 selection_y = PANGO_PIXELS (first_y) + line_display->top_margin;
616 selection_height = PANGO_PIXELS (last_y) - PANGO_PIXELS (first_y);
620 selection_y -= line_display->top_margin;
621 selection_height += line_display->top_margin;
624 at_last_line = pango_layout_iter_at_last_line (iter);
626 selection_height += line_display->bottom_margin;
630 if (selection_start_index < byte_offset &&
631 selection_end_index > line->length + byte_offset) /* All selected */
633 cairo_t *cr = text_renderer->cr;
636 gdk_cairo_set_source_rgba (cr, &selection);
638 line_display->left_margin, selection_y,
639 screen_width, selection_height);
643 text_renderer_set_state (text_renderer, SELECTED);
644 pango_renderer_draw_layout_line (PANGO_RENDERER (text_renderer),
651 if (line_display->pg_bg_rgba)
653 cairo_t *cr = text_renderer->cr;
657 gdk_cairo_set_source_rgba (text_renderer->cr, line_display->pg_bg_rgba);
659 line_display->left_margin, selection_y,
660 screen_width, selection_height);
666 text_renderer_set_state (text_renderer, NORMAL);
667 pango_renderer_draw_layout_line (PANGO_RENDERER (text_renderer),
672 /* Check if some part of the line is selected; the newline
673 * that is after line->length for the last line of the
674 * paragraph counts as part of the line for this
676 if ((selection_start_index < byte_offset + line->length ||
677 (selection_start_index == byte_offset + line->length && pango_layout_iter_at_last_line (iter))) &&
678 selection_end_index > byte_offset)
680 cairo_t *cr = text_renderer->cr;
681 cairo_region_t *clip_region = get_selected_clip (text_renderer, layout, line,
682 line_display->x_offset,
685 selection_start_index, selection_end_index);
688 gdk_cairo_region (cr, clip_region);
690 cairo_region_destroy (clip_region);
692 gdk_cairo_set_source_rgba (cr, &selection);
694 PANGO_PIXELS (line_rect.x),
696 PANGO_PIXELS (line_rect.width),
700 text_renderer_set_state (text_renderer, SELECTED);
701 pango_renderer_draw_layout_line (PANGO_RENDERER (text_renderer),
708 /* Paint in the ends of the line */
709 if (line_rect.x > line_display->left_margin * PANGO_SCALE &&
710 ((line_display->direction == GTK_TEXT_DIR_LTR && selection_start_index < byte_offset) ||
711 (line_display->direction == GTK_TEXT_DIR_RTL && selection_end_index > byte_offset + line->length)))
715 gdk_cairo_set_source_rgba (cr, &selection);
717 line_display->left_margin,
719 PANGO_PIXELS (line_rect.x) - line_display->left_margin,
726 if (line_rect.x + line_rect.width <
727 (screen_width + line_display->left_margin) * PANGO_SCALE &&
728 ((line_display->direction == GTK_TEXT_DIR_LTR && selection_end_index > byte_offset + line->length) ||
729 (line_display->direction == GTK_TEXT_DIR_RTL && selection_start_index < byte_offset)))
734 line_display->left_margin + screen_width -
735 PANGO_PIXELS (line_rect.x) - PANGO_PIXELS (line_rect.width);
739 gdk_cairo_set_source_rgba (cr, &selection);
741 PANGO_PIXELS (line_rect.x) + PANGO_PIXELS (line_rect.width),
750 else if (line_display->has_block_cursor &&
751 gtk_widget_has_focus (text_renderer->widget) &&
752 byte_offset <= line_display->insert_index &&
753 (line_display->insert_index < byte_offset + line->length ||
754 (at_last_line && line_display->insert_index == byte_offset + line->length)))
756 GdkRectangle cursor_rect;
757 GdkRGBA cursor_color;
758 cairo_t *cr = text_renderer->cr;
760 /* we draw text using base color on filled cursor rectangle of cursor color
761 * (normally white on black) */
762 _gtk_style_context_get_cursor_color (context, &cursor_color, NULL);
764 cursor_rect.x = line_display->x_offset + line_display->block_cursor.x;
765 cursor_rect.y = line_display->block_cursor.y + line_display->top_margin;
766 cursor_rect.width = line_display->block_cursor.width;
767 cursor_rect.height = line_display->block_cursor.height;
771 gdk_cairo_rectangle (cr, &cursor_rect);
774 gdk_cairo_set_source_rgba (cr, &cursor_color);
777 /* draw text under the cursor if any */
778 if (!line_display->cursor_at_line_end)
782 state = gtk_widget_get_state_flags (text_renderer->widget);
783 gtk_style_context_get_background_color (context, state, &color);
785 gdk_cairo_set_source_rgba (cr, &color);
787 text_renderer_set_state (text_renderer, CURSOR);
789 pango_renderer_draw_layout_line (PANGO_RENDERER (text_renderer),
799 byte_offset += line->length;
801 while (pango_layout_iter_next_line (iter));
803 pango_layout_iter_free (iter);
806 static GtkTextRenderer *
807 get_text_renderer (void)
809 static GtkTextRenderer *text_renderer = NULL;
812 text_renderer = g_object_new (GTK_TYPE_TEXT_RENDERER, NULL);
814 return text_renderer;
818 gtk_text_layout_draw (GtkTextLayout *layout,
823 GtkStyleContext *context;
825 GtkTextRenderer *text_renderer;
826 GtkTextIter selection_start, selection_end;
827 gboolean have_selection;
833 g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
834 g_return_if_fail (layout->default_style != NULL);
835 g_return_if_fail (layout->buffer != NULL);
836 g_return_if_fail (cr != NULL);
838 if (!gdk_cairo_get_clip_rectangle (cr, &clip))
841 context = gtk_widget_get_style_context (widget);
843 line_list = gtk_text_layout_get_lines (layout, clip.y, clip.y + clip.height, &offset_y);
845 if (line_list == NULL)
846 return; /* nothing on the screen */
848 text_renderer = get_text_renderer ();
849 text_renderer_begin (text_renderer, widget, cr);
851 /* text_renderer_begin/end does cairo_save/restore */
852 cairo_translate (cr, 0, offset_y);
854 gtk_text_layout_wrap_loop_start (layout);
856 have_selection = gtk_text_buffer_get_selection_bounds (layout->buffer,
860 tmp_list = line_list;
861 while (tmp_list != NULL)
863 GtkTextLineDisplay *line_display;
864 gint selection_start_index = -1;
865 gint selection_end_index = -1;
867 GtkTextLine *line = tmp_list->data;
869 line_display = gtk_text_layout_get_line_display (layout, line, FALSE);
871 if (line_display->height > 0)
873 g_assert (line_display->layout != NULL);
877 GtkTextIter line_start, line_end;
880 gtk_text_layout_get_iter_at_line (layout,
883 line_end = line_start;
884 if (!gtk_text_iter_ends_line (&line_end))
885 gtk_text_iter_forward_to_line_end (&line_end);
886 byte_count = gtk_text_iter_get_visible_line_index (&line_end);
888 if (gtk_text_iter_compare (&selection_start, &line_end) <= 0 &&
889 gtk_text_iter_compare (&selection_end, &line_start) >= 0)
891 if (gtk_text_iter_compare (&selection_start, &line_start) >= 0)
892 selection_start_index = gtk_text_iter_get_visible_line_index (&selection_start);
894 selection_start_index = -1;
896 if (gtk_text_iter_compare (&selection_end, &line_end) <= 0)
897 selection_end_index = gtk_text_iter_get_visible_line_index (&selection_end);
899 selection_end_index = byte_count + 1; /* + 1 to flag past-the-end */
903 render_para (text_renderer, line_display,
904 selection_start_index, selection_end_index);
906 /* We paint the cursors last, because they overlap another chunk
907 * and need to appear on top.
909 if (line_display->cursors != NULL)
913 for (i = 0; i < line_display->cursors->len; i++)
918 index = g_array_index(line_display->cursors, int, i);
919 dir = (line_display->direction == GTK_TEXT_DIR_RTL) ? PANGO_DIRECTION_RTL : PANGO_DIRECTION_LTR;
920 gtk_render_insertion_cursor (context, cr,
921 line_display->x_offset, line_display->top_margin,
922 line_display->layout, index, dir);
925 } /* line_display->height > 0 */
927 cairo_translate (cr, 0, line_display->height);
928 gtk_text_layout_free_line_display (layout, line_display);
930 tmp_list = g_slist_next (tmp_list);
933 gtk_text_layout_wrap_loop_end (layout);
935 tmp_widgets = text_renderer_end (text_renderer);
937 *widgets = tmp_widgets;
939 g_list_free_full (tmp_widgets, g_object_unref);
941 g_slist_free (line_list);