gtk2/gtk/gtk9slice.c
2010-12-05 12:18:30 -05:00

376 lines
13 KiB
C

/* GTK - The GIMP Toolkit
* Copyright (C) 2010 Carlos Garnacho <carlosg@gnome.org>
*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include "gtk9slice.h"
enum {
BORDER_LEFT,
BORDER_MIDDLE,
BORDER_RIGHT,
BORDER_LAST,
BORDER_TOP = BORDER_LEFT,
BORDER_BOTTOM = BORDER_RIGHT
};
enum {
SIDE_TOP,
SIDE_RIGHT,
SIDE_BOTTOM,
SIDE_LEFT
};
struct Gtk9Slice
{
cairo_surface_t *surfaces[BORDER_LAST][BORDER_LAST];
GtkSliceSideModifier modifiers[4];
gdouble distances[4];
gint ref_count;
};
G_DEFINE_BOXED_TYPE (Gtk9Slice, _gtk_9slice,
_gtk_9slice_ref, _gtk_9slice_unref)
Gtk9Slice *
_gtk_9slice_new (GdkPixbuf *pixbuf,
gdouble distance_top,
gdouble distance_bottom,
gdouble distance_left,
gdouble distance_right,
GtkSliceSideModifier horizontal_modifier,
GtkSliceSideModifier vertical_modifier)
{
Gtk9Slice *slice;
cairo_surface_t *surface;
gint width, height;
cairo_t *cr;
g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), NULL);
slice = g_slice_new0 (Gtk9Slice);
slice->ref_count = 1;
slice->distances[SIDE_TOP] = distance_top;
slice->distances[SIDE_BOTTOM] = distance_bottom;
slice->distances[SIDE_LEFT] = distance_left;
slice->distances[SIDE_RIGHT] = distance_right;
slice->modifiers[SIDE_TOP] = slice->modifiers[SIDE_BOTTOM] = horizontal_modifier;
slice->modifiers[SIDE_LEFT] = slice->modifiers[SIDE_RIGHT] = vertical_modifier;
width = gdk_pixbuf_get_width (pixbuf);
height = gdk_pixbuf_get_height (pixbuf);
/* Get an image surface from the pixbuf */
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, width, height);
cr = cairo_create (surface);
gdk_cairo_set_source_pixbuf (cr, pixbuf, 0, 0);
cairo_paint (cr);
cairo_destroy (cr);
/* Top /left corner */
slice->surfaces[BORDER_LEFT][BORDER_TOP] = cairo_surface_create_similar (surface, CAIRO_CONTENT_COLOR_ALPHA,
distance_left, distance_top);
cr = cairo_create (slice->surfaces[BORDER_LEFT][BORDER_TOP]);
cairo_set_source_surface (cr, surface, 0, 0);
cairo_paint (cr);
cairo_destroy (cr);
/* Top/right corner */
slice->surfaces[BORDER_RIGHT][BORDER_TOP] = cairo_surface_create_similar (surface, CAIRO_CONTENT_COLOR_ALPHA,
distance_right, distance_top);
cr = cairo_create (slice->surfaces[BORDER_RIGHT][BORDER_TOP]);
cairo_set_source_surface (cr, surface, - width + distance_right, 0);
cairo_paint (cr);
cairo_destroy (cr);
/* Bottom/left corner */
slice->surfaces[BORDER_LEFT][BORDER_BOTTOM] = cairo_surface_create_similar (surface, CAIRO_CONTENT_COLOR_ALPHA,
distance_left, distance_bottom);
cr = cairo_create (slice->surfaces[BORDER_LEFT][BORDER_BOTTOM]);
cairo_set_source_surface (cr, surface, 0, - height + distance_bottom);
cairo_paint (cr);
cairo_destroy (cr);
/* Bottom/right corner */
slice->surfaces[BORDER_RIGHT][BORDER_BOTTOM] = cairo_surface_create_similar (surface, CAIRO_CONTENT_COLOR_ALPHA,
distance_right, distance_bottom);
cr = cairo_create (slice->surfaces[BORDER_RIGHT][BORDER_BOTTOM]);
cairo_set_source_surface (cr, surface, - width + distance_right, - height + distance_bottom);
cairo_paint (cr);
cairo_destroy (cr);
/* Top side */
slice->surfaces[BORDER_MIDDLE][BORDER_TOP] = cairo_surface_create_similar (surface,
CAIRO_CONTENT_COLOR_ALPHA,
width - distance_left - distance_right,
distance_top);
cr = cairo_create (slice->surfaces[BORDER_MIDDLE][BORDER_TOP]);
cairo_set_source_surface (cr, surface, - distance_left, 0);
cairo_paint (cr);
cairo_destroy (cr);
/* Bottom side */
slice->surfaces[BORDER_MIDDLE][BORDER_BOTTOM] = cairo_surface_create_similar (surface,
CAIRO_CONTENT_COLOR_ALPHA,
width - distance_left - distance_right,
distance_bottom);
cr = cairo_create (slice->surfaces[BORDER_MIDDLE][BORDER_BOTTOM]);
cairo_set_source_surface (cr, surface, - distance_left, - height + distance_bottom);
cairo_paint (cr);
cairo_destroy (cr);
/* Left side */
slice->surfaces[BORDER_LEFT][BORDER_MIDDLE] = cairo_surface_create_similar (surface,
CAIRO_CONTENT_COLOR_ALPHA,
distance_left,
height - distance_top - distance_bottom);
cr = cairo_create (slice->surfaces[BORDER_LEFT][BORDER_MIDDLE]);
cairo_set_source_surface (cr, surface, 0, - distance_top);
cairo_paint (cr);
cairo_destroy (cr);
/* Right side */
slice->surfaces[BORDER_RIGHT][BORDER_MIDDLE] = cairo_surface_create_similar (surface,
CAIRO_CONTENT_COLOR_ALPHA,
distance_right,
height - distance_top - distance_bottom);
cr = cairo_create (slice->surfaces[BORDER_RIGHT][BORDER_MIDDLE]);
cairo_set_source_surface (cr, surface, - width + distance_right, - distance_top);
cairo_paint (cr);
cairo_destroy (cr);
/* Center */
slice->surfaces[BORDER_MIDDLE][BORDER_MIDDLE] = cairo_surface_create_similar (surface,
CAIRO_CONTENT_COLOR_ALPHA,
width - distance_left - distance_right,
height - distance_top - distance_bottom);
cr = cairo_create (slice->surfaces[BORDER_MIDDLE][BORDER_MIDDLE]);
cairo_set_source_surface (cr, surface, - distance_left, - distance_top);
cairo_paint (cr);
cairo_destroy (cr);
cairo_surface_destroy (surface);
return slice;
}
static void
render_border (cairo_t *cr,
cairo_surface_t *surface,
guint side,
gdouble x,
gdouble y,
gdouble width,
gdouble height,
GtkSliceSideModifier modifier)
{
cairo_pattern_t *pattern;
cairo_matrix_t matrix;
cairo_save (cr);
cairo_rectangle (cr, x, y, width, height);
cairo_clip (cr);
pattern = cairo_pattern_create_for_surface (surface);
if (modifier == GTK_SLICE_REPEAT)
{
cairo_matrix_init_translate (&matrix, - x, - y);
cairo_pattern_set_extend (pattern, CAIRO_EXTEND_REPEAT);
cairo_pattern_set_matrix (pattern, &matrix);
cairo_set_source (cr, pattern);
cairo_rectangle (cr, x, y, width, height);
cairo_fill (cr);
}
else
{
/* Use nearest filter so borders aren't blurred */
cairo_pattern_set_filter (pattern, CAIRO_FILTER_NEAREST);
if (side == SIDE_TOP || side == SIDE_BOTTOM)
{
gint w = cairo_image_surface_get_width (surface);
cairo_translate (cr, x, y);
cairo_scale (cr, width / w, 1.0);
}
else
{
gint h = cairo_image_surface_get_height (surface);
cairo_translate (cr, x, y);
cairo_scale (cr, 1.0, height / h);
}
cairo_set_source (cr, pattern);
cairo_rectangle (cr, x, y, width, height);
cairo_paint (cr);
}
cairo_restore (cr);
cairo_pattern_destroy (pattern);
}
static void
render_corner (cairo_t *cr,
cairo_surface_t *surface,
gdouble x,
gdouble y,
gdouble width,
gdouble height)
{
cairo_save (cr);
cairo_rectangle (cr, x, y, width, height);
cairo_clip (cr);
cairo_set_source_surface (cr, surface, x, y);
cairo_rectangle (cr, x, y, width, height);
cairo_fill (cr);
cairo_restore (cr);
}
void
_gtk_9slice_render (Gtk9Slice *slice,
cairo_t *cr,
gdouble x,
gdouble y,
gdouble width,
gdouble height)
{
int img_width, img_height;
cairo_surface_t *surface;
cairo_save (cr);
/* Top side */
surface = slice->surfaces[BORDER_MIDDLE][BORDER_TOP];
img_height = cairo_image_surface_get_height (surface);
render_border (cr, surface, SIDE_TOP,
x + slice->distances[SIDE_LEFT], y,
width - slice->distances[SIDE_LEFT] - slice->distances[SIDE_RIGHT],
(gdouble) img_height,
slice->modifiers[SIDE_TOP]);
/* Bottom side */
surface = slice->surfaces[BORDER_MIDDLE][BORDER_BOTTOM];
img_height = cairo_image_surface_get_height (surface);
render_border (cr, surface, SIDE_BOTTOM,
x + slice->distances[SIDE_LEFT], y + height - img_height,
width - slice->distances[SIDE_LEFT] - slice->distances[SIDE_RIGHT],
(gdouble) img_height,
slice->modifiers[SIDE_BOTTOM]);
/* Left side */
surface = slice->surfaces[BORDER_LEFT][BORDER_MIDDLE];
img_width = cairo_image_surface_get_width (surface);
render_border (cr, surface, SIDE_LEFT,
x, y + slice->distances[SIDE_TOP],
(gdouble) img_width,
height - slice->distances[SIDE_TOP] - slice->distances[SIDE_BOTTOM],
slice->modifiers[SIDE_LEFT]);
/* Right side */
surface = slice->surfaces[BORDER_RIGHT][BORDER_MIDDLE];
img_width = cairo_image_surface_get_width (surface);
render_border (cr, surface, SIDE_RIGHT,
x + width - img_width, y + slice->distances[SIDE_TOP],
(gdouble) img_width,
height - slice->distances[SIDE_TOP] - slice->distances[SIDE_BOTTOM],
slice->modifiers[SIDE_RIGHT]);
/* Top/Left corner */
surface = slice->surfaces[BORDER_LEFT][BORDER_TOP];
img_width = cairo_image_surface_get_width (surface);
img_height = cairo_image_surface_get_height (surface);
render_corner (cr, surface, x, y, (gdouble) img_width, (gdouble) img_height);
/* Top/right corner */
surface = slice->surfaces[BORDER_RIGHT][BORDER_TOP];
img_width = cairo_image_surface_get_width (surface);
img_height = cairo_image_surface_get_height (surface);
render_corner (cr, surface, x + width - img_width, y,
(gdouble) img_width, (gdouble) img_height);
/* Bottom/left corner */
surface = slice->surfaces[BORDER_LEFT][BORDER_BOTTOM];
img_width = cairo_image_surface_get_width (surface);
img_height = cairo_image_surface_get_height (surface);
render_corner (cr, surface, x, y + height - img_height,
(gdouble) img_width, (gdouble) img_height);
/* Bottom/right corner */
surface = slice->surfaces[BORDER_RIGHT][BORDER_BOTTOM];
img_width = cairo_image_surface_get_width (surface);
img_height = cairo_image_surface_get_height (surface);
render_corner (cr, surface, x + width - img_width, y + height - img_height,
(gdouble) img_width, (gdouble) img_height);
cairo_restore (cr);
}
Gtk9Slice *
_gtk_9slice_ref (Gtk9Slice *slice)
{
g_return_val_if_fail (slice != NULL, NULL);
slice->ref_count++;
return slice;
}
void
_gtk_9slice_unref (Gtk9Slice *slice)
{
g_return_if_fail (slice != NULL);
slice->ref_count--;
if (slice->ref_count == 0)
{
gint i, j;
for (i = 0; i < BORDER_LAST; i++)
for (j = 0; j < BORDER_LAST; j++)
cairo_surface_destroy (slice->surfaces[i][j]);
g_slice_free (Gtk9Slice, slice);
}
}