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1572bccc9f1f781b720bb030730f34a1f59c498b
gimp/app/core/gimpgrid.c
Ell 1572bccc9f app: add support for subpixel image grids 
In particular, this enables grids whose points of intersection
are at the middle of the image's pixels, which is useful for
undistorted painting with odd-sized brushes using tools other than
the pencil.

This commit also changes the grid visibility behavior, so that the
the visibiltiy of horizontal and vertical grid lines (depending on
the zoom level) is independent.
2017-02-19 18:13:41 -05:00

354 lines
10 KiB
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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* GimpGrid
* Copyright (C) 2003 Henrik Brix Andersen <brix@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 <string.h>
#include <cairo.h>
#include <gegl.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include "libgimpmath/gimpmath.h"
#include "libgimpbase/gimpbase.h"
#include "libgimpconfig/gimpconfig.h"
#include "libgimpcolor/gimpcolor.h"
#include "core-types.h"
#include "gimpgrid.h"
#include "gimp-intl.h"
enum
{
PROP_0,
PROP_STYLE,
PROP_FGCOLOR,
PROP_BGCOLOR,
PROP_XSPACING,
PROP_YSPACING,
PROP_SPACING_UNIT,
PROP_XOFFSET,
PROP_YOFFSET,
PROP_OFFSET_UNIT
};
static void gimp_grid_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void gimp_grid_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
G_DEFINE_TYPE_WITH_CODE (GimpGrid, gimp_grid, GIMP_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (GIMP_TYPE_CONFIG, NULL))
static void
gimp_grid_class_init (GimpGridClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GimpRGB black;
GimpRGB white;
object_class->get_property = gimp_grid_get_property;
object_class->set_property = gimp_grid_set_property;
gimp_rgba_set (&black, 0.0, 0.0, 0.0, GIMP_OPACITY_OPAQUE);
gimp_rgba_set (&white, 1.0, 1.0, 1.0, GIMP_OPACITY_OPAQUE);
GIMP_CONFIG_PROP_ENUM (object_class, PROP_STYLE,
"style",
_("Line style"),
_("Line style used for the grid."),
GIMP_TYPE_GRID_STYLE,
GIMP_GRID_SOLID,
GIMP_PARAM_STATIC_STRINGS);
GIMP_CONFIG_PROP_RGB (object_class, PROP_FGCOLOR,
"fgcolor",
_("Foreground color"),
_("The foreground color of the grid."),
TRUE, &black,
GIMP_PARAM_STATIC_STRINGS);
GIMP_CONFIG_PROP_RGB (object_class, PROP_BGCOLOR,
"bgcolor",
_("Background color"),
_("The background color of the grid; "
"only used in double dashed line style."),
TRUE, &white,
GIMP_PARAM_STATIC_STRINGS);
GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_XSPACING,
"xspacing",
_("Spacing X"),
_("Horizontal spacing of grid lines."),
0.0, GIMP_MAX_IMAGE_SIZE, 10.0,
GIMP_PARAM_STATIC_STRINGS);
GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_YSPACING,
"yspacing",
_("Spacing Y"),
_("Vertical spacing of grid lines."),
0.0, GIMP_MAX_IMAGE_SIZE, 10.0,
GIMP_PARAM_STATIC_STRINGS);
GIMP_CONFIG_PROP_UNIT (object_class, PROP_SPACING_UNIT,
"spacing-unit",
_("Spacing unit"),
NULL,
FALSE, FALSE, GIMP_UNIT_INCH,
GIMP_PARAM_STATIC_STRINGS);
GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_XOFFSET,
"xoffset",
_("Offset X"),
_("Horizontal offset of the first grid "
"line; this may be a negative number."),
- GIMP_MAX_IMAGE_SIZE,
GIMP_MAX_IMAGE_SIZE, 0.0,
GIMP_PARAM_STATIC_STRINGS);
GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_YOFFSET,
"yoffset",
_("Offset Y"),
_("Vertical offset of the first grid "
"line; this may be a negative number."),
- GIMP_MAX_IMAGE_SIZE,
GIMP_MAX_IMAGE_SIZE, 0.0,
GIMP_PARAM_STATIC_STRINGS);
GIMP_CONFIG_PROP_UNIT (object_class, PROP_OFFSET_UNIT,
"offset-unit",
_("Offset unit"),
NULL,
FALSE, FALSE, GIMP_UNIT_INCH,
GIMP_PARAM_STATIC_STRINGS);
}
static void
gimp_grid_init (GimpGrid *grid)
{
}
static void
gimp_grid_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GimpGrid *grid = GIMP_GRID (object);
switch (property_id)
{
case PROP_STYLE:
g_value_set_enum (value, grid->style);
break;
case PROP_FGCOLOR:
g_value_set_boxed (value, &grid->fgcolor);
break;
case PROP_BGCOLOR:
g_value_set_boxed (value, &grid->bgcolor);
break;
case PROP_XSPACING:
g_value_set_double (value, grid->xspacing);
break;
case PROP_YSPACING:
g_value_set_double (value, grid->yspacing);
break;
case PROP_SPACING_UNIT:
g_value_set_int (value, grid->spacing_unit);
break;
case PROP_XOFFSET:
g_value_set_double (value, grid->xoffset);
break;
case PROP_YOFFSET:
g_value_set_double (value, grid->yoffset);
break;
case PROP_OFFSET_UNIT:
g_value_set_int (value, grid->offset_unit);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_grid_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GimpGrid *grid = GIMP_GRID (object);
GimpRGB *color;
switch (property_id)
{
case PROP_STYLE:
grid->style = g_value_get_enum (value);
break;
case PROP_FGCOLOR:
color = g_value_get_boxed (value);
grid->fgcolor = *color;
break;
case PROP_BGCOLOR:
color = g_value_get_boxed (value);
grid->bgcolor = *color;
break;
case PROP_XSPACING:
grid->xspacing = g_value_get_double (value);
break;
case PROP_YSPACING:
grid->yspacing = g_value_get_double (value);
break;
case PROP_SPACING_UNIT:
grid->spacing_unit = g_value_get_int (value);
break;
case PROP_XOFFSET:
grid->xoffset = g_value_get_double (value);
break;
case PROP_YOFFSET:
grid->yoffset = g_value_get_double (value);
break;
case PROP_OFFSET_UNIT:
grid->offset_unit = g_value_get_int (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
/* public functions */
GimpGridStyle
gimp_grid_get_style (GimpGrid *grid)
{
g_return_val_if_fail (GIMP_IS_GRID (grid), GIMP_GRID_SOLID);
return grid->style;
}
void
gimp_grid_get_fgcolor (GimpGrid *grid,
GimpRGB *fgcolor)
{
g_return_if_fail (GIMP_IS_GRID (grid));
g_return_if_fail (fgcolor != NULL);
*fgcolor = grid->fgcolor;
}
void
gimp_grid_get_bgcolor (GimpGrid *grid,
GimpRGB *bgcolor)
{
g_return_if_fail (GIMP_IS_GRID (grid));
g_return_if_fail (bgcolor != NULL);
*bgcolor = grid->bgcolor;
}
void
gimp_grid_get_spacing (GimpGrid *grid,
gdouble *xspacing,
gdouble *yspacing)
{
g_return_if_fail (GIMP_IS_GRID (grid));
if (xspacing) *xspacing = grid->xspacing;
if (yspacing) *yspacing = grid->yspacing;
}
void
gimp_grid_get_offset (GimpGrid *grid,
gdouble *xoffset,
gdouble *yoffset)
{
g_return_if_fail (GIMP_IS_GRID (grid));
if (xoffset) *xoffset = grid->xoffset;
if (yoffset) *yoffset = grid->yoffset;
}
const gchar *
gimp_grid_parasite_name (void)
{
return "gimp-image-grid";
}
GimpParasite *
gimp_grid_to_parasite (GimpGrid *grid)
{
GimpParasite *parasite;
gchar *str;
g_return_val_if_fail (GIMP_IS_GRID (grid), NULL);
str = gimp_config_serialize_to_string (GIMP_CONFIG (grid), NULL);
g_return_val_if_fail (str != NULL, NULL);
parasite = gimp_parasite_new (gimp_grid_parasite_name (),
GIMP_PARASITE_PERSISTENT,
strlen (str) + 1, str);
g_free (str);
return parasite;
}
GimpGrid *
gimp_grid_from_parasite (const GimpParasite *parasite)
{
GimpGrid *grid;
const gchar *str;
GError *error = NULL;
g_return_val_if_fail (parasite != NULL, NULL);
g_return_val_if_fail (strcmp (gimp_parasite_name (parasite),
gimp_grid_parasite_name ()) == 0, NULL);
str = gimp_parasite_data (parasite);
g_return_val_if_fail (str != NULL, NULL);
grid = g_object_new (GIMP_TYPE_GRID, NULL);
if (! gimp_config_deserialize_string (GIMP_CONFIG (grid),
str,
gimp_parasite_data_size (parasite),
NULL,
&error))
{
g_warning ("Failed to deserialize grid parasite: %s", error->message);
g_error_free (error);
}
return grid;
}
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