Robin Gareus
ad51c7c2ba
This is intended mainly for GNU/Linux distros who will remove GTK2 support in the near future.
234 lines
8.3 KiB
C
234 lines
8.3 KiB
C
/* gtktextdisplay.c - display layed-out text
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*
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* Copyright (c) 2010 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*
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* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
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* file for a list of people on the GTK+ Team. See the ChangeLog
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* files for a list of changes. These files are distributed with
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* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
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*/
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#include "config.h"
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#include <pango/pangocairo.h>
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#include "gtkintl.h"
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#define GTK_TYPE_FILL_LAYOUT_RENDERER (_gtk_fill_layout_renderer_get_type())
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#define GTK_FILL_LAYOUT_RENDERER(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), GTK_TYPE_FILL_LAYOUT_RENDERER, GtkFillLayoutRenderer))
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#define GTK_IS_FILL_LAYOUT_RENDERER(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), GTK_TYPE_FILL_LAYOUT_RENDERER))
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#define GTK_FILL_LAYOUT_RENDERER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GTK_TYPE_FILL_LAYOUT_RENDERER, GtkFillLayoutRendererClass))
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#define GTK_IS_FILL_LAYOUT_RENDERER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GTK_TYPE_FILL_LAYOUT_RENDERER))
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#define GTK_FILL_LAYOUT_RENDERER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_FILL_LAYOUT_RENDERER, GtkFillLayoutRendererClass))
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typedef struct _GtkFillLayoutRenderer GtkFillLayoutRenderer;
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typedef struct _GtkFillLayoutRendererClass GtkFillLayoutRendererClass;
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struct _GtkFillLayoutRenderer
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{
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PangoRenderer parent_instance;
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cairo_t *cr;
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};
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struct _GtkFillLayoutRendererClass
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{
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PangoRendererClass parent_class;
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};
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G_DEFINE_TYPE (GtkFillLayoutRenderer, _gtk_fill_layout_renderer, PANGO_TYPE_RENDERER)
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static void
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gtk_fill_layout_renderer_draw_glyphs (PangoRenderer *renderer,
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PangoFont *font,
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PangoGlyphString *glyphs,
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int x,
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int y)
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{
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GtkFillLayoutRenderer *text_renderer = GTK_FILL_LAYOUT_RENDERER (renderer);
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cairo_move_to (text_renderer->cr, (double)x / PANGO_SCALE, (double)y / PANGO_SCALE);
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pango_cairo_show_glyph_string (text_renderer->cr, font, glyphs);
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}
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static void
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gtk_fill_layout_renderer_draw_glyph_item (PangoRenderer *renderer,
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const char *text,
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PangoGlyphItem *glyph_item,
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int x,
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int y)
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{
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GtkFillLayoutRenderer *text_renderer = GTK_FILL_LAYOUT_RENDERER (renderer);
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cairo_move_to (text_renderer->cr, (double)x / PANGO_SCALE, (double)y / PANGO_SCALE);
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pango_cairo_show_glyph_item (text_renderer->cr, text, glyph_item);
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}
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static void
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gtk_fill_layout_renderer_draw_rectangle (PangoRenderer *renderer,
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PangoRenderPart part,
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int x,
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int y,
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int width,
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int height)
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{
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GtkFillLayoutRenderer *text_renderer = GTK_FILL_LAYOUT_RENDERER (renderer);
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if (part == PANGO_RENDER_PART_BACKGROUND)
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return;
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cairo_rectangle (text_renderer->cr,
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(double)x / PANGO_SCALE, (double)y / PANGO_SCALE,
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(double)width / PANGO_SCALE, (double)height / PANGO_SCALE);
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cairo_fill (text_renderer->cr);
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}
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static void
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gtk_fill_layout_renderer_draw_trapezoid (PangoRenderer *renderer,
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PangoRenderPart part,
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double y1_,
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double x11,
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double x21,
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double y2,
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double x12,
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double x22)
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{
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GtkFillLayoutRenderer *text_renderer = GTK_FILL_LAYOUT_RENDERER (renderer);
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cairo_matrix_t matrix;
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cairo_t *cr;
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cr = text_renderer->cr;
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cairo_save (cr);
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/* use identity scale, but keep translation */
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cairo_get_matrix (cr, &matrix);
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matrix.xx = matrix.yy = 1;
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matrix.xy = matrix.yx = 0;
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cairo_set_matrix (cr, &matrix);
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cairo_move_to (cr, x11, y1_);
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cairo_line_to (cr, x21, y1_);
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cairo_line_to (cr, x22, y2);
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cairo_line_to (cr, x12, y2);
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cairo_close_path (cr);
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cairo_fill (cr);
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cairo_restore (cr);
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}
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static void
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gtk_fill_layout_renderer_draw_error_underline (PangoRenderer *renderer,
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int x,
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int y,
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int width,
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int height)
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{
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GtkFillLayoutRenderer *text_renderer = GTK_FILL_LAYOUT_RENDERER (renderer);
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pango_cairo_show_error_underline (text_renderer->cr,
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(double)x / PANGO_SCALE, (double)y / PANGO_SCALE,
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(double)width / PANGO_SCALE, (double)height / PANGO_SCALE);
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}
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static void
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gtk_fill_layout_renderer_draw_shape (PangoRenderer *renderer,
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PangoAttrShape *attr,
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int x,
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int y)
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{
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GtkFillLayoutRenderer *text_renderer = GTK_FILL_LAYOUT_RENDERER (renderer);
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cairo_t *cr = text_renderer->cr;
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PangoLayout *layout;
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PangoCairoShapeRendererFunc shape_renderer;
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gpointer shape_renderer_data;
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layout = pango_renderer_get_layout (renderer);
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if (!layout)
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return;
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shape_renderer = pango_cairo_context_get_shape_renderer (pango_layout_get_context (layout),
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&shape_renderer_data);
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if (!shape_renderer)
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return;
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cairo_save (cr);
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cairo_move_to (cr, (double)x / PANGO_SCALE, (double)y / PANGO_SCALE);
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shape_renderer (cr, attr, FALSE, shape_renderer_data);
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cairo_restore (cr);
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}
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static void
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gtk_fill_layout_renderer_finalize (GObject *object)
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{
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G_OBJECT_CLASS (_gtk_fill_layout_renderer_parent_class)->finalize (object);
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}
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static void
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_gtk_fill_layout_renderer_init (GtkFillLayoutRenderer *renderer)
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{
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}
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static void
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_gtk_fill_layout_renderer_class_init (GtkFillLayoutRendererClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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PangoRendererClass *renderer_class = PANGO_RENDERER_CLASS (klass);
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renderer_class->draw_glyphs = gtk_fill_layout_renderer_draw_glyphs;
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renderer_class->draw_glyph_item = gtk_fill_layout_renderer_draw_glyph_item;
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renderer_class->draw_rectangle = gtk_fill_layout_renderer_draw_rectangle;
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renderer_class->draw_trapezoid = gtk_fill_layout_renderer_draw_trapezoid;
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renderer_class->draw_error_underline = gtk_fill_layout_renderer_draw_error_underline;
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renderer_class->draw_shape = gtk_fill_layout_renderer_draw_shape;
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object_class->finalize = gtk_fill_layout_renderer_finalize;
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}
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void
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_gtk_pango_fill_layout (cairo_t *cr,
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PangoLayout *layout)
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{
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static GtkFillLayoutRenderer *renderer = NULL;
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gboolean has_current_point;
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double current_x, current_y;
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has_current_point = cairo_has_current_point (cr);
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cairo_get_current_point (cr, ¤t_x, ¤t_y);
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if (renderer == NULL)
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renderer = g_object_new (GTK_TYPE_FILL_LAYOUT_RENDERER, NULL);
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cairo_save (cr);
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cairo_translate (cr, current_x, current_y);
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renderer->cr = cr;
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pango_renderer_draw_layout (PANGO_RENDERER (renderer), layout, 0, 0);
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cairo_restore (cr);
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if (has_current_point)
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cairo_move_to (cr, current_x, current_y);
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}
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