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, see <http://www.gnu.org/licenses/>.Free
25 *
26 * Original Tk license:
27 *
28 * This software is copyrighted by the Regents of the University of
29 * California, Sun Microsystems, Inc., and other parties. The
30 * following terms apply to all files associated with the software
31 * unless explicitly disclaimed in individual files.
32 *
33 * The authors hereby grant permission to use, copy, modify,
34 * distribute, and license this software and its documentation for any
35 * purpose, provided that existing copyright notices are retained in
36 * all copies and that this notice is included verbatim in any
37 * distributions. No written agreement, license, or royalty fee is
38 * required for any of the authorized uses. Modifications to this
39 * software may be copyrighted by their authors and need not follow
40 * the licensing terms described here, provided that the new terms are
41 * clearly indicated on the first page of each file where they apply.
42 *
43 * IN NO EVENT SHALL THE AUTHORS OR DISTRIBUTORS BE LIABLE TO ANY
44 * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
45 * DAMAGES ARISING OUT OF THE USE OF THIS SOFTWARE, ITS DOCUMENTATION,
46 * OR ANY DERIVATIVES THEREOF, EVEN IF THE AUTHORS HAVE BEEN ADVISED
47 * OF THE POSSIBILITY OF SUCH DAMAGE.
48 *
49 * THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES,
50 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
51 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND
52 * NON-INFRINGEMENT. THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS,
53 * AND THE AUTHORS AND DISTRIBUTORS HAVE NO OBLIGATION TO PROVIDE
54 * MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
55 *
56 * GOVERNMENT USE: If you are acquiring this software on behalf of the
57 * U.S. government, the Government shall have only "Restricted Rights"
58 * in the software and related documentation as defined in the Federal
59 * Acquisition Regulations (FARs) in Clause 52.227.19 (c) (2). If you
60 * are acquiring the software on behalf of the Department of Defense,
61 * the software shall be classified as "Commercial Computer Software"
62 * and the Government shall have only "Restricted Rights" as defined
63 * in Clause 252.227-7013 (c) (1) of DFARs. Notwithstanding the
64 * foregoing, the authors grant the U.S. Government and others acting
65 * in its behalf permission to use and distribute the software in
66 * accordance with the terms specified in this license.
67 *
68 */
69 /*
70 * Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
71 * file for a list of people on the GTK+ Team. See the ChangeLog
72 * files for a list of changes. These files are distributed with
73 * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
74 */
75
76 #define GTK_TEXT_USE_INTERNAL_UNSUPPORTED_API
77 #include "config.h"
78 #include "gtktextattributesprivate.h"
79 #include "gtktextdisplay.h"
80 #include "gtkwidgetprivate.h"
81 #include "gtkstylecontextprivate.h"
82 #include "gtkintl.h"
83
84 /* DO NOT go putting private headers in here. This file should only
85 * use the semi-public headers, as with gtktextview.c.
86 */
87
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))
94
95 typedef struct _GtkTextRenderer GtkTextRenderer;
96 typedef struct _GtkTextRendererClass GtkTextRendererClass;
97
98 enum {
99 NORMAL,
100 SELECTED,
101 CURSOR
102 };
103
104 struct _GtkTextRenderer
105 {
106 PangoRenderer parent_instance;
107
108 GtkWidget *widget;
109 cairo_t *cr;
110
111 GdkRGBA *error_color; /* Error underline color for this widget */
112 GList *widgets; /* widgets encountered when drawing */
113
114 guint state : 2;
115 };
116
117 struct _GtkTextRendererClass
118 {
119 PangoRendererClass parent_class;
120 };
121
122 GType _gtk_text_renderer_get_type (void);
123
G_DEFINE_TYPE(GtkTextRenderer,_gtk_text_renderer,PANGO_TYPE_RENDERER)124 G_DEFINE_TYPE (GtkTextRenderer, _gtk_text_renderer, PANGO_TYPE_RENDERER)
125
126 static void
127 text_renderer_set_rgba (GtkTextRenderer *text_renderer,
128 PangoRenderPart part,
129 const GdkRGBA *rgba)
130 {
131 PangoRenderer *renderer = PANGO_RENDERER (text_renderer);
132 PangoColor color = { 0, };
133 guint16 alpha;
134
135 if (rgba)
136 {
137 color.red = (guint16)(rgba->red * 65535);
138 color.green = (guint16)(rgba->green * 65535);
139 color.blue = (guint16)(rgba->blue * 65535);
140 alpha = (guint16)(rgba->alpha * 65535);
141 pango_renderer_set_color (renderer, part, &color);
142 pango_renderer_set_alpha (renderer, part, alpha);
143 }
144 else
145 {
146 pango_renderer_set_color (renderer, part, NULL);
147 pango_renderer_set_alpha (renderer, part, 0);
148 }
149 }
150
151 static GtkTextAppearance *
get_item_appearance(PangoItem * item)152 get_item_appearance (PangoItem *item)
153 {
154 GSList *tmp_list = item->analysis.extra_attrs;
155
156 while (tmp_list)
157 {
158 PangoAttribute *attr = tmp_list->data;
159
160 if (attr->klass->type == gtk_text_attr_appearance_type)
161 return &((GtkTextAttrAppearance *)attr)->appearance;
162
163 tmp_list = tmp_list->next;
164 }
165
166 return NULL;
167 }
168
169 extern GtkCssNode *gtk_text_view_get_text_node (GtkTextView *text_view);
170 extern GtkCssNode *gtk_text_view_get_selection_node (GtkTextView *text_view);
171
172 static void
gtk_text_renderer_prepare_run(PangoRenderer * renderer,PangoLayoutRun * run)173 gtk_text_renderer_prepare_run (PangoRenderer *renderer,
174 PangoLayoutRun *run)
175 {
176 GtkStyleContext *context;
177 GtkTextRenderer *text_renderer = GTK_TEXT_RENDERER (renderer);
178 GdkRGBA *bg_rgba = NULL;
179 GdkRGBA *fg_rgba = NULL;
180 GtkTextAppearance *appearance;
181
182 PANGO_RENDERER_CLASS (_gtk_text_renderer_parent_class)->prepare_run (renderer, run);
183
184 appearance = get_item_appearance (run->item);
185 g_assert (appearance != NULL);
186
187 context = gtk_widget_get_style_context (text_renderer->widget);
188
189 if (appearance->draw_bg && text_renderer->state == NORMAL)
190 bg_rgba = appearance->rgba[0];
191 else
192 bg_rgba = NULL;
193
194 text_renderer_set_rgba (text_renderer, PANGO_RENDER_PART_BACKGROUND, bg_rgba);
195
196 if (text_renderer->state == SELECTED)
197 {
198 GtkCssNode *selection_node;
199
200 selection_node = gtk_text_view_get_selection_node ((GtkTextView *)text_renderer->widget);
201 gtk_style_context_save_to_node (context, selection_node);
202
203 gtk_style_context_get (context, gtk_style_context_get_state (context),
204 "color", &fg_rgba,
205 NULL);
206
207 gtk_style_context_restore (context);
208 }
209 else if (text_renderer->state == CURSOR && gtk_widget_has_focus (text_renderer->widget))
210 {
211 gtk_style_context_get (context, gtk_style_context_get_state (context),
212 "background-color", &fg_rgba,
213 NULL);
214 }
215 else
216 fg_rgba = appearance->rgba[1];
217
218 text_renderer_set_rgba (text_renderer, PANGO_RENDER_PART_FOREGROUND, fg_rgba);
219
220 if (GTK_TEXT_APPEARANCE_GET_STRIKETHROUGH_RGBA_SET (appearance))
221 {
222 GdkRGBA rgba;
223
224 GTK_TEXT_APPEARANCE_GET_STRIKETHROUGH_RGBA (appearance, &rgba);
225 text_renderer_set_rgba (text_renderer, PANGO_RENDER_PART_STRIKETHROUGH, &rgba);
226 }
227 else
228 text_renderer_set_rgba (text_renderer, PANGO_RENDER_PART_STRIKETHROUGH, fg_rgba);
229
230 if (GTK_TEXT_APPEARANCE_GET_UNDERLINE_RGBA_SET (appearance))
231 {
232 GdkRGBA rgba;
233
234 GTK_TEXT_APPEARANCE_GET_UNDERLINE_RGBA (appearance, &rgba);
235 text_renderer_set_rgba (text_renderer, PANGO_RENDER_PART_UNDERLINE, &rgba);
236 }
237 else if (appearance->underline == PANGO_UNDERLINE_ERROR)
238 {
239 if (!text_renderer->error_color)
240 {
241 GdkColor *color = NULL;
242
243 gtk_style_context_get_style (context,
244 "error-underline-color", &color,
245 NULL);
246
247 if (color)
248 {
249 GdkRGBA rgba;
250
251 rgba.red = color->red / 65535.;
252 rgba.green = color->green / 65535.;
253 rgba.blue = color->blue / 65535.;
254 rgba.alpha = 1;
255 G_GNUC_BEGIN_IGNORE_DEPRECATIONS
256 gdk_color_free (color);
257 G_GNUC_END_IGNORE_DEPRECATIONS
258
259 text_renderer->error_color = gdk_rgba_copy (&rgba);
260 }
261 else
262 {
263 static const GdkRGBA red = { 1, 0, 0, 1 };
264 text_renderer->error_color = gdk_rgba_copy (&red);
265 }
266 }
267
268 text_renderer_set_rgba (text_renderer, PANGO_RENDER_PART_UNDERLINE, text_renderer->error_color);
269 }
270 else
271 text_renderer_set_rgba (text_renderer, PANGO_RENDER_PART_UNDERLINE, fg_rgba);
272
273 if (fg_rgba != appearance->rgba[1])
274 gdk_rgba_free (fg_rgba);
275 }
276
277 static void
set_color(GtkTextRenderer * text_renderer,PangoRenderPart part)278 set_color (GtkTextRenderer *text_renderer,
279 PangoRenderPart part)
280 {
281 PangoColor *color;
282 GdkRGBA rgba;
283 guint16 alpha;
284
285 cairo_save (text_renderer->cr);
286
287 color = pango_renderer_get_color (PANGO_RENDERER (text_renderer), part);
288 alpha = pango_renderer_get_alpha (PANGO_RENDERER (text_renderer), part);
289 if (color)
290 {
291 rgba.red = color->red / 65535.;
292 rgba.green = color->green / 65535.;
293 rgba.blue = color->blue / 65535.;
294 rgba.alpha = alpha / 65535.;
295 gdk_cairo_set_source_rgba (text_renderer->cr, &rgba);
296 }
297 }
298
299 static void
unset_color(GtkTextRenderer * text_renderer)300 unset_color (GtkTextRenderer *text_renderer)
301 {
302 cairo_restore (text_renderer->cr);
303 }
304
305 static void
gtk_text_renderer_draw_glyphs(PangoRenderer * renderer,PangoFont * font,PangoGlyphString * glyphs,int x,int y)306 gtk_text_renderer_draw_glyphs (PangoRenderer *renderer,
307 PangoFont *font,
308 PangoGlyphString *glyphs,
309 int x,
310 int y)
311 {
312 GtkTextRenderer *text_renderer = GTK_TEXT_RENDERER (renderer);
313
314 set_color (text_renderer, PANGO_RENDER_PART_FOREGROUND);
315
316 cairo_move_to (text_renderer->cr, (double)x / PANGO_SCALE, (double)y / PANGO_SCALE);
317 pango_cairo_show_glyph_string (text_renderer->cr, font, glyphs);
318
319 unset_color (text_renderer);
320 }
321
322 static void
gtk_text_renderer_draw_glyph_item(PangoRenderer * renderer,const char * text,PangoGlyphItem * glyph_item,int x,int y)323 gtk_text_renderer_draw_glyph_item (PangoRenderer *renderer,
324 const char *text,
325 PangoGlyphItem *glyph_item,
326 int x,
327 int y)
328 {
329 GtkTextRenderer *text_renderer = GTK_TEXT_RENDERER (renderer);
330
331 set_color (text_renderer, PANGO_RENDER_PART_FOREGROUND);
332
333 cairo_move_to (text_renderer->cr, (double)x / PANGO_SCALE, (double)y / PANGO_SCALE);
334 pango_cairo_show_glyph_item (text_renderer->cr, text, glyph_item);
335
336 unset_color (text_renderer);
337 }
338
339 static void
gtk_text_renderer_draw_rectangle(PangoRenderer * renderer,PangoRenderPart part,int x,int y,int width,int height)340 gtk_text_renderer_draw_rectangle (PangoRenderer *renderer,
341 PangoRenderPart part,
342 int x,
343 int y,
344 int width,
345 int height)
346 {
347 GtkTextRenderer *text_renderer = GTK_TEXT_RENDERER (renderer);
348
349 set_color (text_renderer, part);
350
351 cairo_rectangle (text_renderer->cr,
352 (double)x / PANGO_SCALE, (double)y / PANGO_SCALE,
353 (double)width / PANGO_SCALE, (double)height / PANGO_SCALE);
354 cairo_fill (text_renderer->cr);
355
356 unset_color (text_renderer);
357 }
358
359 static void
gtk_text_renderer_draw_trapezoid(PangoRenderer * renderer,PangoRenderPart part,double y1_,double x11,double x21,double y2,double x12,double x22)360 gtk_text_renderer_draw_trapezoid (PangoRenderer *renderer,
361 PangoRenderPart part,
362 double y1_,
363 double x11,
364 double x21,
365 double y2,
366 double x12,
367 double x22)
368 {
369 GtkTextRenderer *text_renderer = GTK_TEXT_RENDERER (renderer);
370 cairo_t *cr;
371 cairo_matrix_t matrix;
372
373 set_color (text_renderer, part);
374
375 cr = text_renderer->cr;
376
377 cairo_get_matrix (cr, &matrix);
378 matrix.xx = matrix.yy = 1.0;
379 matrix.xy = matrix.yx = 0.0;
380 cairo_set_matrix (cr, &matrix);
381
382 cairo_move_to (cr, x11, y1_);
383 cairo_line_to (cr, x21, y1_);
384 cairo_line_to (cr, x22, y2);
385 cairo_line_to (cr, x12, y2);
386 cairo_close_path (cr);
387
388 cairo_fill (cr);
389
390 unset_color (text_renderer);
391 }
392
393 static void
gtk_text_renderer_draw_error_underline(PangoRenderer * renderer,int x,int y,int width,int height)394 gtk_text_renderer_draw_error_underline (PangoRenderer *renderer,
395 int x,
396 int y,
397 int width,
398 int height)
399 {
400 GtkTextRenderer *text_renderer = GTK_TEXT_RENDERER (renderer);
401
402 set_color (text_renderer, PANGO_RENDER_PART_UNDERLINE);
403
404 pango_cairo_show_error_underline (text_renderer->cr,
405 (double)x / PANGO_SCALE, (double)y / PANGO_SCALE,
406 (double)width / PANGO_SCALE, (double)height / PANGO_SCALE);
407
408 unset_color (text_renderer);
409 }
410
411 static void
gtk_text_renderer_draw_shape(PangoRenderer * renderer,PangoAttrShape * attr,int x,int y)412 gtk_text_renderer_draw_shape (PangoRenderer *renderer,
413 PangoAttrShape *attr,
414 int x,
415 int y)
416 {
417 GtkTextRenderer *text_renderer = GTK_TEXT_RENDERER (renderer);
418
419 if (attr->data == NULL)
420 {
421 /* This happens if we have an empty widget anchor. Draw
422 * something empty-looking.
423 */
424 GdkRectangle shape_rect;
425 cairo_t *cr;
426
427 shape_rect.x = PANGO_PIXELS (x);
428 shape_rect.y = PANGO_PIXELS (y + attr->logical_rect.y);
429 shape_rect.width = PANGO_PIXELS (x + attr->logical_rect.width) - shape_rect.x;
430 shape_rect.height = PANGO_PIXELS (y + attr->logical_rect.y + attr->logical_rect.height) - shape_rect.y;
431
432 set_color (text_renderer, PANGO_RENDER_PART_FOREGROUND);
433
434 cr = text_renderer->cr;
435
436 cairo_set_line_width (cr, 1.0);
437
438 cairo_rectangle (cr,
439 shape_rect.x + 0.5, shape_rect.y + 0.5,
440 shape_rect.width - 1, shape_rect.height - 1);
441 cairo_move_to (cr, shape_rect.x + 0.5, shape_rect.y + 0.5);
442 cairo_line_to (cr,
443 shape_rect.x + shape_rect.width - 0.5,
444 shape_rect.y + shape_rect.height - 0.5);
445 cairo_move_to (cr, shape_rect.x + 0.5,
446 shape_rect.y + shape_rect.height - 0.5);
447 cairo_line_to (cr, shape_rect.x + shape_rect.width - 0.5,
448 shape_rect.y + 0.5);
449
450 cairo_stroke (cr);
451
452 unset_color (text_renderer);
453 }
454 else if (GDK_IS_PIXBUF (attr->data))
455 {
456 cairo_t *cr = text_renderer->cr;
457 GdkPixbuf *pixbuf = GDK_PIXBUF (attr->data);
458
459 cairo_save (cr);
460
461 gdk_cairo_set_source_pixbuf (cr, pixbuf,
462 PANGO_PIXELS (x),
463 PANGO_PIXELS (y) - gdk_pixbuf_get_height (pixbuf));
464 cairo_paint (cr);
465
466 cairo_restore (cr);
467 }
468 else if (GTK_IS_WIDGET (attr->data))
469 {
470 GtkWidget *widget;
471
472 widget = GTK_WIDGET (attr->data);
473
474 text_renderer->widgets = g_list_prepend (text_renderer->widgets,
475 g_object_ref (widget));
476 }
477 else
478 g_assert_not_reached (); /* not a pixbuf or widget */
479 }
480
481 static void
gtk_text_renderer_finalize(GObject * object)482 gtk_text_renderer_finalize (GObject *object)
483 {
484 G_OBJECT_CLASS (_gtk_text_renderer_parent_class)->finalize (object);
485 }
486
487 static void
_gtk_text_renderer_init(GtkTextRenderer * renderer)488 _gtk_text_renderer_init (GtkTextRenderer *renderer)
489 {
490 }
491
492 static void
_gtk_text_renderer_class_init(GtkTextRendererClass * klass)493 _gtk_text_renderer_class_init (GtkTextRendererClass *klass)
494 {
495 GObjectClass *object_class = G_OBJECT_CLASS (klass);
496
497 PangoRendererClass *renderer_class = PANGO_RENDERER_CLASS (klass);
498
499 renderer_class->prepare_run = gtk_text_renderer_prepare_run;
500 renderer_class->draw_glyphs = gtk_text_renderer_draw_glyphs;
501 renderer_class->draw_glyph_item = gtk_text_renderer_draw_glyph_item;
502 renderer_class->draw_rectangle = gtk_text_renderer_draw_rectangle;
503 renderer_class->draw_trapezoid = gtk_text_renderer_draw_trapezoid;
504 renderer_class->draw_error_underline = gtk_text_renderer_draw_error_underline;
505 renderer_class->draw_shape = gtk_text_renderer_draw_shape;
506
507 object_class->finalize = gtk_text_renderer_finalize;
508 }
509
510 static void
text_renderer_set_state(GtkTextRenderer * text_renderer,int state)511 text_renderer_set_state (GtkTextRenderer *text_renderer,
512 int state)
513 {
514 text_renderer->state = state;
515 }
516
517 static void
text_renderer_begin(GtkTextRenderer * text_renderer,GtkWidget * widget,cairo_t * cr)518 text_renderer_begin (GtkTextRenderer *text_renderer,
519 GtkWidget *widget,
520 cairo_t *cr)
521 {
522 GtkStyleContext *context;
523 GtkStateFlags state;
524 GdkRGBA color;
525 GtkCssNode *text_node;
526
527 text_renderer->widget = widget;
528 text_renderer->cr = cr;
529
530 context = gtk_widget_get_style_context (widget);
531
532 text_node = gtk_text_view_get_text_node ((GtkTextView *)widget);
533 gtk_style_context_save_to_node (context, text_node);
534
535 state = gtk_style_context_get_state (context);
536 gtk_style_context_get_color (context, state, &color);
537
538 cairo_save (cr);
539
540 gdk_cairo_set_source_rgba (cr, &color);
541 }
542
543 /* Returns a GSList of (referenced) widgets encountered while drawing.
544 */
545 static GList *
text_renderer_end(GtkTextRenderer * text_renderer)546 text_renderer_end (GtkTextRenderer *text_renderer)
547 {
548 GtkStyleContext *context;
549 GList *widgets = text_renderer->widgets;
550
551 cairo_restore (text_renderer->cr);
552
553 context = gtk_widget_get_style_context (text_renderer->widget);
554
555 gtk_style_context_restore (context);
556
557 text_renderer->widget = NULL;
558 text_renderer->cr = NULL;
559
560 text_renderer->widgets = NULL;
561
562 if (text_renderer->error_color)
563 {
564 gdk_rgba_free (text_renderer->error_color);
565 text_renderer->error_color = NULL;
566 }
567
568 return widgets;
569 }
570
571 static cairo_region_t *
get_selected_clip(GtkTextRenderer * text_renderer,PangoLayout * layout,PangoLayoutLine * line,int x,int y,int height,int start_index,int end_index)572 get_selected_clip (GtkTextRenderer *text_renderer,
573 PangoLayout *layout,
574 PangoLayoutLine *line,
575 int x,
576 int y,
577 int height,
578 int start_index,
579 int end_index)
580 {
581 gint *ranges;
582 gint n_ranges, i;
583 cairo_region_t *clip_region = cairo_region_create ();
584
585 pango_layout_line_get_x_ranges (line, start_index, end_index, &ranges, &n_ranges);
586
587 for (i=0; i < n_ranges; i++)
588 {
589 GdkRectangle rect;
590
591 rect.x = x + PANGO_PIXELS (ranges[2*i]);
592 rect.y = y;
593 rect.width = PANGO_PIXELS (ranges[2*i + 1]) - PANGO_PIXELS (ranges[2*i]);
594 rect.height = height;
595
596 cairo_region_union_rectangle (clip_region, &rect);
597 }
598
599 g_free (ranges);
600 return clip_region;
601 }
602
603 static void
render_para(GtkTextRenderer * text_renderer,GtkTextLineDisplay * line_display,int selection_start_index,int selection_end_index)604 render_para (GtkTextRenderer *text_renderer,
605 GtkTextLineDisplay *line_display,
606 int selection_start_index,
607 int selection_end_index)
608 {
609 GtkStyleContext *context;
610 PangoLayout *layout = line_display->layout;
611 int byte_offset = 0;
612 PangoLayoutIter *iter;
613 int screen_width;
614 GdkRGBA selection;
615 gboolean first = TRUE;
616 GtkCssNode *selection_node;
617
618 iter = pango_layout_get_iter (layout);
619 screen_width = line_display->total_width;
620
621 context = gtk_widget_get_style_context (text_renderer->widget);
622 selection_node = gtk_text_view_get_selection_node ((GtkTextView*)text_renderer->widget);
623 gtk_style_context_save_to_node (context, selection_node);
624
625 G_GNUC_BEGIN_IGNORE_DEPRECATIONS
626 gtk_style_context_get_background_color (context, gtk_style_context_get_state (context), &selection);
627 G_GNUC_END_IGNORE_DEPRECATIONS
628
629 gtk_style_context_restore (context);
630
631 do
632 {
633 PangoLayoutLine *line = pango_layout_iter_get_line_readonly (iter);
634 int selection_y, selection_height;
635 int first_y, last_y;
636 PangoRectangle line_rect;
637 int baseline;
638 gboolean at_last_line;
639
640 pango_layout_iter_get_line_extents (iter, NULL, &line_rect);
641 baseline = pango_layout_iter_get_baseline (iter);
642 pango_layout_iter_get_line_yrange (iter, &first_y, &last_y);
643
644 /* Adjust for margins */
645
646 line_rect.x += line_display->x_offset * PANGO_SCALE;
647 line_rect.y += line_display->top_margin * PANGO_SCALE;
648 baseline += line_display->top_margin * PANGO_SCALE;
649
650 /* Selection is the height of the line, plus top/bottom
651 * margin if we're the first/last line
652 */
653 selection_y = PANGO_PIXELS (first_y) + line_display->top_margin;
654 selection_height = PANGO_PIXELS (last_y) - PANGO_PIXELS (first_y);
655
656 if (first)
657 {
658 selection_y -= line_display->top_margin;
659 selection_height += line_display->top_margin;
660 }
661
662 at_last_line = pango_layout_iter_at_last_line (iter);
663 if (at_last_line)
664 selection_height += line_display->bottom_margin;
665
666 first = FALSE;
667
668 if (selection_start_index < byte_offset &&
669 selection_end_index > line->length + byte_offset) /* All selected */
670 {
671 cairo_t *cr = text_renderer->cr;
672
673 cairo_save (cr);
674 gdk_cairo_set_source_rgba (cr, &selection);
675 cairo_rectangle (cr,
676 line_display->left_margin, selection_y,
677 screen_width, selection_height);
678 cairo_fill (cr);
679 cairo_restore(cr);
680
681 text_renderer_set_state (text_renderer, SELECTED);
682 pango_renderer_draw_layout_line (PANGO_RENDERER (text_renderer),
683 line,
684 line_rect.x,
685 baseline);
686 }
687 else
688 {
689 if (line_display->pg_bg_rgba)
690 {
691 cairo_t *cr = text_renderer->cr;
692
693 cairo_save (cr);
694
695 gdk_cairo_set_source_rgba (text_renderer->cr, line_display->pg_bg_rgba);
696 cairo_rectangle (cr,
697 line_display->left_margin, selection_y,
698 screen_width, selection_height);
699 cairo_fill (cr);
700
701 cairo_restore (cr);
702 }
703
704 text_renderer_set_state (text_renderer, NORMAL);
705 pango_renderer_draw_layout_line (PANGO_RENDERER (text_renderer),
706 line,
707 line_rect.x,
708 baseline);
709
710 /* Check if some part of the line is selected; the newline
711 * that is after line->length for the last line of the
712 * paragraph counts as part of the line for this
713 */
714 if ((selection_start_index < byte_offset + line->length ||
715 (selection_start_index == byte_offset + line->length && pango_layout_iter_at_last_line (iter))) &&
716 selection_end_index > byte_offset)
717 {
718 cairo_t *cr = text_renderer->cr;
719 cairo_region_t *clip_region = get_selected_clip (text_renderer, layout, line,
720 line_display->x_offset,
721 selection_y,
722 selection_height,
723 selection_start_index, selection_end_index);
724
725 cairo_save (cr);
726 gdk_cairo_region (cr, clip_region);
727 cairo_clip (cr);
728 cairo_region_destroy (clip_region);
729
730 gdk_cairo_set_source_rgba (cr, &selection);
731 cairo_rectangle (cr,
732 PANGO_PIXELS (line_rect.x),
733 selection_y,
734 PANGO_PIXELS (line_rect.width),
735 selection_height);
736 cairo_fill (cr);
737
738 text_renderer_set_state (text_renderer, SELECTED);
739 pango_renderer_draw_layout_line (PANGO_RENDERER (text_renderer),
740 line,
741 line_rect.x,
742 baseline);
743
744 cairo_restore (cr);
745
746 /* Paint in the ends of the line */
747 if (line_rect.x > line_display->left_margin * PANGO_SCALE &&
748 ((line_display->direction == GTK_TEXT_DIR_LTR && selection_start_index < byte_offset) ||
749 (line_display->direction == GTK_TEXT_DIR_RTL && selection_end_index > byte_offset + line->length)))
750 {
751 cairo_save (cr);
752
753 gdk_cairo_set_source_rgba (cr, &selection);
754 cairo_rectangle (cr,
755 line_display->left_margin,
756 selection_y,
757 PANGO_PIXELS (line_rect.x) - line_display->left_margin,
758 selection_height);
759 cairo_fill (cr);
760
761 cairo_restore (cr);
762 }
763
764 if (line_rect.x + line_rect.width <
765 (screen_width + line_display->left_margin) * PANGO_SCALE &&
766 ((line_display->direction == GTK_TEXT_DIR_LTR && selection_end_index > byte_offset + line->length) ||
767 (line_display->direction == GTK_TEXT_DIR_RTL && selection_start_index < byte_offset)))
768 {
769 int nonlayout_width;
770
771 nonlayout_width =
772 line_display->left_margin + screen_width -
773 PANGO_PIXELS (line_rect.x) - PANGO_PIXELS (line_rect.width);
774
775 cairo_save (cr);
776
777 gdk_cairo_set_source_rgba (cr, &selection);
778 cairo_rectangle (cr,
779 PANGO_PIXELS (line_rect.x) + PANGO_PIXELS (line_rect.width),
780 selection_y,
781 nonlayout_width,
782 selection_height);
783 cairo_fill (cr);
784
785 cairo_restore (cr);
786 }
787 }
788 else if (line_display->has_block_cursor &&
789 gtk_widget_has_focus (text_renderer->widget) &&
790 byte_offset <= line_display->insert_index &&
791 (line_display->insert_index < byte_offset + line->length ||
792 (at_last_line && line_display->insert_index == byte_offset + line->length)))
793 {
794 GdkRectangle cursor_rect;
795 GdkRGBA cursor_color;
796 cairo_t *cr = text_renderer->cr;
797
798 /* we draw text using base color on filled cursor rectangle of cursor color
799 * (normally white on black) */
800 _gtk_style_context_get_cursor_color (context, &cursor_color, NULL);
801
802 cursor_rect.x = line_display->x_offset + line_display->block_cursor.x;
803 cursor_rect.y = line_display->block_cursor.y + line_display->top_margin;
804 cursor_rect.width = line_display->block_cursor.width;
805 cursor_rect.height = line_display->block_cursor.height;
806
807 cairo_save (cr);
808
809 gdk_cairo_rectangle (cr, &cursor_rect);
810 cairo_clip (cr);
811
812 gdk_cairo_set_source_rgba (cr, &cursor_color);
813 cairo_paint (cr);
814
815 /* draw text under the cursor if any */
816 if (!line_display->cursor_at_line_end)
817 {
818 GdkRGBA color;
819
820 G_GNUC_BEGIN_IGNORE_DEPRECATIONS
821 gtk_style_context_get_background_color (context, gtk_style_context_get_state (context), &color);
822 G_GNUC_END_IGNORE_DEPRECATIONS
823
824 gdk_cairo_set_source_rgba (cr, &color);
825
826 text_renderer_set_state (text_renderer, CURSOR);
827
828 pango_renderer_draw_layout_line (PANGO_RENDERER (text_renderer),
829 line,
830 line_rect.x,
831 baseline);
832 }
833
834 cairo_restore (cr);
835 }
836 }
837
838 byte_offset += line->length;
839 }
840 while (pango_layout_iter_next_line (iter));
841
842 pango_layout_iter_free (iter);
843 }
844
845 static GtkTextRenderer *
get_text_renderer(void)846 get_text_renderer (void)
847 {
848 static GtkTextRenderer *text_renderer = NULL;
849
850 if (!text_renderer)
851 text_renderer = g_object_new (GTK_TYPE_TEXT_RENDERER, NULL);
852
853 return text_renderer;
854 }
855
856 void
gtk_text_layout_draw(GtkTextLayout * layout,GtkWidget * widget,cairo_t * cr,GList ** widgets)857 gtk_text_layout_draw (GtkTextLayout *layout,
858 GtkWidget *widget,
859 cairo_t *cr,
860 GList **widgets)
861 {
862 GtkStyleContext *context;
863 gint offset_y;
864 GtkTextRenderer *text_renderer;
865 GtkTextIter selection_start, selection_end;
866 gboolean have_selection;
867 GSList *line_list;
868 GSList *tmp_list;
869 GList *tmp_widgets;
870 GdkRectangle clip;
871
872 g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
873 g_return_if_fail (layout->default_style != NULL);
874 g_return_if_fail (layout->buffer != NULL);
875 g_return_if_fail (cr != NULL);
876
877 if (!gdk_cairo_get_clip_rectangle (cr, &clip))
878 return;
879
880 context = gtk_widget_get_style_context (widget);
881
882 line_list = gtk_text_layout_get_lines (layout, clip.y, clip.y + clip.height, &offset_y);
883
884 if (line_list == NULL)
885 return; /* nothing on the screen */
886
887 text_renderer = get_text_renderer ();
888 text_renderer_begin (text_renderer, widget, cr);
889
890 /* text_renderer_begin/end does cairo_save/restore */
891 cairo_translate (cr, 0, offset_y);
892
893 gtk_text_layout_wrap_loop_start (layout);
894
895 have_selection = gtk_text_buffer_get_selection_bounds (layout->buffer,
896 &selection_start,
897 &selection_end);
898
899 tmp_list = line_list;
900 while (tmp_list != NULL)
901 {
902 GtkTextLineDisplay *line_display;
903 gint selection_start_index = -1;
904 gint selection_end_index = -1;
905
906 GtkTextLine *line = tmp_list->data;
907
908 line_display = gtk_text_layout_get_line_display (layout, line, FALSE);
909
910 if (line_display->height > 0)
911 {
912 g_assert (line_display->layout != NULL);
913
914 if (have_selection)
915 {
916 GtkTextIter line_start, line_end;
917 gint byte_count;
918
919 gtk_text_layout_get_iter_at_line (layout,
920 &line_start,
921 line, 0);
922 line_end = line_start;
923 if (!gtk_text_iter_ends_line (&line_end))
924 gtk_text_iter_forward_to_line_end (&line_end);
925 byte_count = gtk_text_iter_get_visible_line_index (&line_end);
926
927 if (gtk_text_iter_compare (&selection_start, &line_end) <= 0 &&
928 gtk_text_iter_compare (&selection_end, &line_start) >= 0)
929 {
930 if (gtk_text_iter_compare (&selection_start, &line_start) >= 0)
931 selection_start_index = gtk_text_iter_get_visible_line_index (&selection_start);
932 else
933 selection_start_index = -1;
934
935 if (gtk_text_iter_compare (&selection_end, &line_end) <= 0)
936 selection_end_index = gtk_text_iter_get_visible_line_index (&selection_end);
937 else
938 selection_end_index = byte_count + 1; /* + 1 to flag past-the-end */
939 }
940 }
941
942 render_para (text_renderer, line_display,
943 selection_start_index, selection_end_index);
944
945 /* We paint the cursors last, because they overlap another chunk
946 * and need to appear on top.
947 */
948 if (line_display->cursors != NULL)
949 {
950 int i;
951
952 for (i = 0; i < line_display->cursors->len; i++)
953 {
954 int index;
955 PangoDirection dir;
956
957 index = g_array_index(line_display->cursors, int, i);
958 dir = (line_display->direction == GTK_TEXT_DIR_RTL) ? PANGO_DIRECTION_RTL : PANGO_DIRECTION_LTR;
959 gtk_render_insertion_cursor (context, cr,
960 line_display->x_offset, line_display->top_margin,
961 line_display->layout, index, dir);
962 }
963 }
964 } /* line_display->height > 0 */
965
966 cairo_translate (cr, 0, line_display->height);
967 gtk_text_layout_free_line_display (layout, line_display);
968
969 tmp_list = tmp_list->next;
970 }
971
972 gtk_text_layout_wrap_loop_end (layout);
973
974 tmp_widgets = text_renderer_end (text_renderer);
975 if (widgets)
976 *widgets = tmp_widgets;
977 else
978 g_list_free_full (tmp_widgets, g_object_unref);
979
980 g_slist_free (line_list);
981 }
982