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