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gimp/app/display/gimpcanvasboundary.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpcanvasboundary.c
* Copyright (C) 2010 Michael Natterer <mitch@gimp.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gegl.h>
#include <gtk/gtk.h>
#include "libgimpbase/gimpbase.h"
#include "libgimpmath/gimpmath.h"
#include "display-types.h"
#include "base/boundary.h"
#include "core/gimpparamspecs.h"
#include "widgets/gimpcairo.h"
#include "gimpcanvasboundary.h"
#include "gimpdisplayshell.h"
#include "gimpdisplayshell-transform.h"
enum
{
PROP_0,
PROP_SEGS,
PROP_TRANSFORM,
PROP_OFFSET_X,
PROP_OFFSET_Y
};
typedef struct _GimpCanvasBoundaryPrivate GimpCanvasBoundaryPrivate;
struct _GimpCanvasBoundaryPrivate
{
BoundSeg *segs;
gint n_segs;
GimpMatrix3 *transform;
gdouble offset_x;
gdouble offset_y;
};
#define GET_PRIVATE(boundary) \
G_TYPE_INSTANCE_GET_PRIVATE (boundary, \
GIMP_TYPE_CANVAS_BOUNDARY, \
GimpCanvasBoundaryPrivate)
/* local function prototypes */
static void gimp_canvas_boundary_finalize (GObject *object);
static void gimp_canvas_boundary_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void gimp_canvas_boundary_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void gimp_canvas_boundary_draw (GimpCanvasItem *item,
GimpDisplayShell *shell,
cairo_t *cr);
static cairo_region_t * gimp_canvas_boundary_get_extents (GimpCanvasItem *item,
GimpDisplayShell *shell);
G_DEFINE_TYPE (GimpCanvasBoundary, gimp_canvas_boundary,
GIMP_TYPE_CANVAS_ITEM)
#define parent_class gimp_canvas_boundary_parent_class
static void
gimp_canvas_boundary_class_init (GimpCanvasBoundaryClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GimpCanvasItemClass *item_class = GIMP_CANVAS_ITEM_CLASS (klass);
object_class->finalize = gimp_canvas_boundary_finalize;
object_class->set_property = gimp_canvas_boundary_set_property;
object_class->get_property = gimp_canvas_boundary_get_property;
item_class->draw = gimp_canvas_boundary_draw;
item_class->get_extents = gimp_canvas_boundary_get_extents;
g_object_class_install_property (object_class, PROP_SEGS,
gimp_param_spec_array ("segs", NULL, NULL,
GIMP_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_TRANSFORM,
g_param_spec_pointer ("transform", NULL, NULL,
GIMP_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_OFFSET_X,
g_param_spec_double ("offset-x", NULL, NULL,
-GIMP_MAX_IMAGE_SIZE,
GIMP_MAX_IMAGE_SIZE, 0,
GIMP_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_OFFSET_Y,
g_param_spec_double ("offset-y", NULL, NULL,
-GIMP_MAX_IMAGE_SIZE,
GIMP_MAX_IMAGE_SIZE, 0,
GIMP_PARAM_READWRITE));
g_type_class_add_private (klass, sizeof (GimpCanvasBoundaryPrivate));
}
static void
gimp_canvas_boundary_init (GimpCanvasBoundary *boundary)
{
gimp_canvas_item_set_line_cap (GIMP_CANVAS_ITEM (boundary),
CAIRO_LINE_CAP_SQUARE);
}
static void
gimp_canvas_boundary_finalize (GObject *object)
{
GimpCanvasBoundaryPrivate *private = GET_PRIVATE (object);
if (private->segs)
{
g_free (private->segs);
private->segs = NULL;
private->n_segs = 0;
}
if (private->transform)
{
g_free (private->transform);
private->transform = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gimp_canvas_boundary_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GimpCanvasBoundaryPrivate *private = GET_PRIVATE (object);
switch (property_id)
{
case PROP_SEGS:
break;
case PROP_TRANSFORM:
{
GimpMatrix3 *transform = g_value_get_pointer (value);
if (private->transform)
g_free (private->transform);
if (transform)
private->transform = g_memdup (transform, sizeof (GimpMatrix3));
else
private->transform = NULL;
}
break;
case PROP_OFFSET_X:
private->offset_x = g_value_get_double (value);
break;
case PROP_OFFSET_Y:
private->offset_y = g_value_get_double (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_canvas_boundary_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GimpCanvasBoundaryPrivate *private = GET_PRIVATE (object);
switch (property_id)
{
case PROP_SEGS:
break;
case PROP_TRANSFORM:
g_value_set_pointer (value, private->transform);
break;
case PROP_OFFSET_X:
g_value_set_double (value, private->offset_x);
break;
case PROP_OFFSET_Y:
g_value_set_double (value, private->offset_y);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_canvas_boundary_transform (GimpCanvasItem *item,
GimpDisplayShell *shell,
GimpSegment *segs)
{
GimpCanvasBoundaryPrivate *private = GET_PRIVATE (item);
gint i;
if (private->transform)
{
for (i = 0; i < private->n_segs; i++)
{
gdouble tx, ty;
gimp_matrix3_transform_point (private->transform,
private->segs[i].x1, private->segs[i].y1,
&tx, &ty);
gimp_display_shell_transform_xy (shell,
tx + private->offset_x,
ty + private->offset_y,
&segs[i].x1, &segs[i].y1);
gimp_matrix3_transform_point (private->transform,
private->segs[i].x2, private->segs[i].y2,
&tx, &ty);
gimp_display_shell_transform_xy (shell,
tx + private->offset_x,
ty + private->offset_y,
&segs[i].x2, &segs[i].y2);
}
}
else
{
gimp_display_shell_transform_segments (shell,
private->segs, segs,
private->n_segs,
private->offset_x,
private->offset_y);
for (i = 0; i < private->n_segs; i++)
{
/* If this segment is a closing segment && the segments lie inside
* the region, OR if this is an opening segment and the segments
* lie outside the region...
* we need to transform it by one display pixel
*/
if (! private->segs[i].open)
{
/* If it is vertical */
if (segs[i].x1 == segs[i].x2)
{
segs[i].x1 -= 1;
segs[i].x2 -= 1;
}
else
{
segs[i].y1 -= 1;
segs[i].y2 -= 1;
}
}
}
}
}
static void
gimp_canvas_boundary_draw (GimpCanvasItem *item,
GimpDisplayShell *shell,
cairo_t *cr)
{
GimpCanvasBoundaryPrivate *private = GET_PRIVATE (item);
GimpSegment *segs;
segs = g_new0 (GimpSegment, private->n_segs);
gimp_canvas_boundary_transform (item, shell, segs);
gimp_cairo_add_segments (cr, segs, private->n_segs);
_gimp_canvas_item_stroke (item, cr);
g_free (segs);
}
static cairo_region_t *
gimp_canvas_boundary_get_extents (GimpCanvasItem *item,
GimpDisplayShell *shell)
{
GimpCanvasBoundaryPrivate *private = GET_PRIVATE (item);
cairo_rectangle_int_t rectangle;
GimpSegment *segs;
gint x1, y1, x2, y2;
gint i;
segs = g_new0 (GimpSegment, private->n_segs);
gimp_canvas_boundary_transform (item, shell, segs);
x1 = MIN (segs[0].x1, segs[0].x2);
y1 = MIN (segs[0].y1, segs[0].y2);
x2 = MAX (segs[0].x1, segs[0].x2);
y2 = MAX (segs[0].y1, segs[0].y2);
for (i = 1; i < private->n_segs; i++)
{
gint x3 = MIN (segs[i].x1, segs[i].x2);
gint y3 = MIN (segs[i].y1, segs[i].y2);
gint x4 = MAX (segs[i].x1, segs[i].x2);
gint y4 = MAX (segs[i].y1, segs[i].y2);
x1 = MIN (x1, x3);
y1 = MIN (y1, y3);
x2 = MAX (x2, x4);
y2 = MAX (y2, y4);
}
g_free (segs);
rectangle.x = x1 - 2;
rectangle.y = y1 - 2;
rectangle.width = x2 - x1 + 4;
rectangle.height = y2 - y1 + 4;
return cairo_region_create_rectangle (&rectangle);
}
GimpCanvasItem *
gimp_canvas_boundary_new (GimpDisplayShell *shell,
const BoundSeg *segs,
gint n_segs,
GimpMatrix3 *transform,
gdouble offset_x,
gdouble offset_y)
{
GimpCanvasItem *item;
GimpCanvasBoundaryPrivate *private;
g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), NULL);
item = g_object_new (GIMP_TYPE_CANVAS_BOUNDARY,
"shell", shell,
"transform", transform,
"offset-x", offset_x,
"offset-y", offset_y,
NULL);
private = GET_PRIVATE (item);
/* puke */
private->segs = g_memdup (segs, n_segs * sizeof (BoundSeg));
private->n_segs = n_segs;
return item;
}
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