1 /* gtktextdisplay.c - display layed-out text
3 * Copyright (c) 2010 Red Hat, Inc.
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free
17 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 * Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
21 * file for a list of people on the GTK+ Team. See the ChangeLog
22 * files for a list of changes. These files are distributed with
23 * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
27 #include <pango/pangocairo.h>
30 #define GTK_TYPE_FILL_LAYOUT_RENDERER (_gtk_fill_layout_renderer_get_type())
31 #define GTK_FILL_LAYOUT_RENDERER(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), GTK_TYPE_FILL_LAYOUT_RENDERER, GtkFillLayoutRenderer))
32 #define GTK_IS_FILL_LAYOUT_RENDERER(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), GTK_TYPE_FILL_LAYOUT_RENDERER))
33 #define GTK_FILL_LAYOUT_RENDERER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GTK_TYPE_FILL_LAYOUT_RENDERER, GtkFillLayoutRendererClass))
34 #define GTK_IS_FILL_LAYOUT_RENDERER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GTK_TYPE_FILL_LAYOUT_RENDERER))
35 #define GTK_FILL_LAYOUT_RENDERER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_FILL_LAYOUT_RENDERER, GtkFillLayoutRendererClass))
37 typedef struct _GtkFillLayoutRenderer GtkFillLayoutRenderer;
38 typedef struct _GtkFillLayoutRendererClass GtkFillLayoutRendererClass;
40 struct _GtkFillLayoutRenderer
42 PangoRenderer parent_instance;
47 struct _GtkFillLayoutRendererClass
49 PangoRendererClass parent_class;
52 G_DEFINE_TYPE (GtkFillLayoutRenderer, _gtk_fill_layout_renderer, PANGO_TYPE_RENDERER)
55 gtk_fill_layout_renderer_draw_glyphs (PangoRenderer *renderer,
57 PangoGlyphString *glyphs,
61 GtkFillLayoutRenderer *text_renderer = GTK_FILL_LAYOUT_RENDERER (renderer);
63 cairo_move_to (text_renderer->cr, (double)x / PANGO_SCALE, (double)y / PANGO_SCALE);
64 pango_cairo_show_glyph_string (text_renderer->cr, font, glyphs);
68 gtk_fill_layout_renderer_draw_glyph_item (PangoRenderer *renderer,
70 PangoGlyphItem *glyph_item,
74 GtkFillLayoutRenderer *text_renderer = GTK_FILL_LAYOUT_RENDERER (renderer);
76 cairo_move_to (text_renderer->cr, (double)x / PANGO_SCALE, (double)y / PANGO_SCALE);
77 pango_cairo_show_glyph_item (text_renderer->cr, text, glyph_item);
81 gtk_fill_layout_renderer_draw_rectangle (PangoRenderer *renderer,
88 GtkFillLayoutRenderer *text_renderer = GTK_FILL_LAYOUT_RENDERER (renderer);
90 if (part == PANGO_RENDER_PART_BACKGROUND)
93 cairo_rectangle (text_renderer->cr,
94 (double)x / PANGO_SCALE, (double)y / PANGO_SCALE,
95 (double)width / PANGO_SCALE, (double)height / PANGO_SCALE);
96 cairo_fill (text_renderer->cr);
100 gtk_fill_layout_renderer_draw_trapezoid (PangoRenderer *renderer,
101 PangoRenderPart part,
109 GtkFillLayoutRenderer *text_renderer = GTK_FILL_LAYOUT_RENDERER (renderer);
110 cairo_matrix_t matrix;
113 cr = text_renderer->cr;
117 /* use identity scale, but keep translation */
118 cairo_get_matrix (cr, &matrix);
119 matrix.xx = matrix.yy = 1;
120 matrix.xy = matrix.yx = 0;
121 cairo_set_matrix (cr, &matrix);
123 cairo_move_to (cr, x11, y1_);
124 cairo_line_to (cr, x21, y1_);
125 cairo_line_to (cr, x22, y2);
126 cairo_line_to (cr, x12, y2);
127 cairo_close_path (cr);
135 gtk_fill_layout_renderer_draw_error_underline (PangoRenderer *renderer,
141 GtkFillLayoutRenderer *text_renderer = GTK_FILL_LAYOUT_RENDERER (renderer);
143 pango_cairo_show_error_underline (text_renderer->cr,
144 (double)x / PANGO_SCALE, (double)y / PANGO_SCALE,
145 (double)width / PANGO_SCALE, (double)height / PANGO_SCALE);
149 gtk_fill_layout_renderer_draw_shape (PangoRenderer *renderer,
150 PangoAttrShape *attr,
154 GtkFillLayoutRenderer *text_renderer = GTK_FILL_LAYOUT_RENDERER (renderer);
155 cairo_t *cr = text_renderer->cr;
157 PangoCairoShapeRendererFunc shape_renderer;
158 gpointer shape_renderer_data;
160 layout = pango_renderer_get_layout (renderer);
165 shape_renderer = pango_cairo_context_get_shape_renderer (pango_layout_get_context (layout),
166 &shape_renderer_data);
173 cairo_move_to (cr, (double)x / PANGO_SCALE, (double)y / PANGO_SCALE);
175 shape_renderer (cr, attr, FALSE, shape_renderer_data);
181 gtk_fill_layout_renderer_finalize (GObject *object)
183 G_OBJECT_CLASS (_gtk_fill_layout_renderer_parent_class)->finalize (object);
187 _gtk_fill_layout_renderer_init (GtkFillLayoutRenderer *renderer)
192 _gtk_fill_layout_renderer_class_init (GtkFillLayoutRendererClass *klass)
194 GObjectClass *object_class = G_OBJECT_CLASS (klass);
196 PangoRendererClass *renderer_class = PANGO_RENDERER_CLASS (klass);
198 renderer_class->draw_glyphs = gtk_fill_layout_renderer_draw_glyphs;
199 renderer_class->draw_glyph_item = gtk_fill_layout_renderer_draw_glyph_item;
200 renderer_class->draw_rectangle = gtk_fill_layout_renderer_draw_rectangle;
201 renderer_class->draw_trapezoid = gtk_fill_layout_renderer_draw_trapezoid;
202 renderer_class->draw_error_underline = gtk_fill_layout_renderer_draw_error_underline;
203 renderer_class->draw_shape = gtk_fill_layout_renderer_draw_shape;
205 object_class->finalize = gtk_fill_layout_renderer_finalize;
209 _gtk_pango_fill_layout (cairo_t *cr,
212 static GtkFillLayoutRenderer *renderer = NULL;
213 gboolean has_current_point;
214 double current_x, current_y;
216 has_current_point = cairo_has_current_point (cr);
217 cairo_get_current_point (cr, ¤t_x, ¤t_y);
219 if (renderer == NULL)
220 renderer = g_object_new (GTK_TYPE_FILL_LAYOUT_RENDERER, NULL);
223 cairo_translate (cr, current_x, current_y);
226 pango_renderer_draw_layout (PANGO_RENDERER (renderer), layout, 0, 0);
230 if (has_current_point)
231 cairo_move_to (cr, current_x, current_y);