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gimp/app/display/gimpcanvasgrid.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpcanvasgrid.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 <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gegl.h>
#include <gtk/gtk.h>
#include "libgimpbase/gimpbase.h"
#include "libgimpmath/gimpmath.h"
#include "libgimpconfig/gimpconfig.h"
#include "display-types.h"
#include "core/gimpgrid.h"
#include "core/gimpimage.h"
#include "gimpcanvas-style.h"
#include "gimpcanvasgrid.h"
#include "gimpdisplayshell.h"
enum
{
PROP_0,
PROP_GRID,
PROP_GRID_STYLE
};
typedef struct _GimpCanvasGridPrivate GimpCanvasGridPrivate;
struct _GimpCanvasGridPrivate
{
GimpGrid *grid;
gboolean grid_style;
};
#define GET_PRIVATE(grid) \
((GimpCanvasGridPrivate *) gimp_canvas_grid_get_instance_private ((GimpCanvasGrid *) (grid)))
/* local function prototypes */
static void gimp_canvas_grid_finalize (GObject *object);
static void gimp_canvas_grid_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void gimp_canvas_grid_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void gimp_canvas_grid_draw (GimpCanvasItem *item,
cairo_t *cr);
static cairo_region_t * gimp_canvas_grid_get_extents (GimpCanvasItem *item);
static void gimp_canvas_grid_stroke (GimpCanvasItem *item,
cairo_t *cr);
G_DEFINE_TYPE_WITH_PRIVATE (GimpCanvasGrid, gimp_canvas_grid,
GIMP_TYPE_CANVAS_ITEM)
#define parent_class gimp_canvas_grid_parent_class
static void
gimp_canvas_grid_class_init (GimpCanvasGridClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GimpCanvasItemClass *item_class = GIMP_CANVAS_ITEM_CLASS (klass);
object_class->finalize = gimp_canvas_grid_finalize;
object_class->set_property = gimp_canvas_grid_set_property;
object_class->get_property = gimp_canvas_grid_get_property;
item_class->draw = gimp_canvas_grid_draw;
item_class->get_extents = gimp_canvas_grid_get_extents;
item_class->stroke = gimp_canvas_grid_stroke;
g_object_class_install_property (object_class, PROP_GRID,
g_param_spec_object ("grid", NULL, NULL,
GIMP_TYPE_GRID,
GIMP_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_GRID_STYLE,
g_param_spec_boolean ("grid-style",
NULL, NULL,
FALSE,
GIMP_PARAM_READWRITE));
}
static void
gimp_canvas_grid_init (GimpCanvasGrid *grid)
{
GimpCanvasGridPrivate *private = GET_PRIVATE (grid);
private->grid = g_object_new (GIMP_TYPE_GRID, NULL);
}
static void
gimp_canvas_grid_finalize (GObject *object)
{
GimpCanvasGridPrivate *private = GET_PRIVATE (object);
g_clear_object (&private->grid);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gimp_canvas_grid_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GimpCanvasGridPrivate *private = GET_PRIVATE (object);
switch (property_id)
{
case PROP_GRID:
{
GimpGrid *grid = g_value_get_object (value);
if (grid)
gimp_config_sync (G_OBJECT (grid), G_OBJECT (private->grid), 0);
}
break;
case PROP_GRID_STYLE:
private->grid_style = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_canvas_grid_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GimpCanvasGridPrivate *private = GET_PRIVATE (object);
switch (property_id)
{
case PROP_GRID:
g_value_set_object (value, private->grid);
break;
case PROP_GRID_STYLE:
g_value_set_boolean (value, private->grid_style);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_canvas_grid_draw (GimpCanvasItem *item,
cairo_t *cr)
{
GimpCanvasGridPrivate *private = GET_PRIVATE (item);
GimpDisplayShell *shell = gimp_canvas_item_get_shell (item);
GimpImage *image = gimp_canvas_item_get_image (item);
gdouble xspacing, yspacing;
gdouble xoffset, yoffset;
gboolean vert, horz;
gdouble x, y;
gdouble dx1, dy1, dx2, dy2;
gint x0, x1, x2, x3;
gint y0, y1, y2, y3;
gint x_real, y_real;
gint width, height;
#define CROSSHAIR 2
gimp_grid_get_spacing (private->grid, &xspacing, &yspacing);
gimp_grid_get_offset (private->grid, &xoffset, &yoffset);
g_return_if_fail (xspacing >= 0.0 &&
yspacing >= 0.0);
/* skip grid drawing when the space between grid lines starts
* disappearing, see bug #599267.
*/
vert = (xspacing * shell->scale_x >= 2.0);
horz = (yspacing * shell->scale_y >= 2.0);
if (! vert && ! horz)
return;
cairo_clip_extents (cr, &dx1, &dy1, &dx2, &dy2);
x1 = floor (dx1);
y1 = floor (dy1);
x2 = ceil (dx2);
y2 = ceil (dy2);
width = gimp_image_get_width (image);
height = gimp_image_get_height (image);
xoffset = fmod (xoffset, xspacing);
yoffset = fmod (yoffset, yspacing);
switch (gimp_grid_get_style (private->grid))
{
case GIMP_GRID_DOTS:
if (vert && horz)
{
for (x = xoffset; x <= width; x += xspacing)
{
if (x < 0)
continue;
gimp_canvas_item_transform_xy (item, x, 0, &x_real, &y_real);
if (x_real < x1 || x_real >= x2)
continue;
for (y = yoffset; y <= height; y += yspacing)
{
if (y < 0)
continue;
gimp_canvas_item_transform_xy (item, x, y, &x_real, &y_real);
if (y_real >= y1 && y_real < y2)
{
cairo_move_to (cr, x_real, y_real + 0.5);
cairo_line_to (cr, x_real + 1, y_real + 0.5);
}
}
}
}
break;
case GIMP_GRID_INTERSECTIONS:
if (vert && horz)
{
for (x = xoffset; x <= width; x += xspacing)
{
if (x < 0)
continue;
gimp_canvas_item_transform_xy (item, x, 0, &x_real, &y_real);
if (x_real + CROSSHAIR < x1 || x_real - CROSSHAIR >= x2)
continue;
for (y = yoffset; y <= height; y += yspacing)
{
if (y < 0)
continue;
gimp_canvas_item_transform_xy (item, x, y, &x_real, &y_real);
if (y_real + CROSSHAIR < y1 || y_real - CROSSHAIR >= y2)
continue;
if (x_real >= x1 && x_real < x2)
{
cairo_move_to (cr,
x_real + 0.5,
CLAMP (y_real - CROSSHAIR,
y1, y2 - 1));
cairo_line_to (cr,
x_real + 0.5,
CLAMP (y_real + CROSSHAIR,
y1, y2 - 1) + 1);
}
if (y_real >= y1 && y_real < y2)
{
cairo_move_to (cr,
CLAMP (x_real - CROSSHAIR,
x1, x2 - 1),
y_real + 0.5);
cairo_line_to (cr,
CLAMP (x_real + CROSSHAIR,
x1, x2 - 1) + 1,
y_real + 0.5);
}
}
}
}
break;
case GIMP_GRID_ON_OFF_DASH:
case GIMP_GRID_DOUBLE_DASH:
case GIMP_GRID_SOLID:
gimp_canvas_item_transform_xy (item, 0, 0, &x0, &y0);
gimp_canvas_item_transform_xy (item, width, height, &x3, &y3);
if (vert)
{
for (x = xoffset; x < width; x += xspacing)
{
if (x < 0)
continue;
gimp_canvas_item_transform_xy (item, x, 0, &x_real, &y_real);
if (x_real >= x1 && x_real < x2)
{
cairo_move_to (cr, x_real + 0.5, y0);
cairo_line_to (cr, x_real + 0.5, y3 + 1);
}
}
}
if (horz)
{
for (y = yoffset; y < height; y += yspacing)
{
if (y < 0)
continue;
gimp_canvas_item_transform_xy (item, 0, y, &x_real, &y_real);
if (y_real >= y1 && y_real < y2)
{
cairo_move_to (cr, x0, y_real + 0.5);
cairo_line_to (cr, x3 + 1, y_real + 0.5);
}
}
}
break;
}
_gimp_canvas_item_stroke (item, cr);
}
static cairo_region_t *
gimp_canvas_grid_get_extents (GimpCanvasItem *item)
{
GimpImage *image = gimp_canvas_item_get_image (item);
cairo_rectangle_int_t rectangle;
gdouble x1, y1;
gdouble x2, y2;
gint w, h;
if (! image)
return NULL;
w = gimp_image_get_width (image);
h = gimp_image_get_height (image);
gimp_canvas_item_transform_xy_f (item, 0, 0, &x1, &y1);
gimp_canvas_item_transform_xy_f (item, w, h, &x2, &y2);
rectangle.x = floor (x1);
rectangle.y = floor (y1);
rectangle.width = ceil (x2) - rectangle.x;
rectangle.height = ceil (y2) - rectangle.y;
return cairo_region_create_rectangle (&rectangle);
}
static void
gimp_canvas_grid_stroke (GimpCanvasItem *item,
cairo_t *cr)
{
GimpCanvasGridPrivate *private = GET_PRIVATE (item);
if (private->grid_style)
{
GimpDisplayShell *shell = gimp_canvas_item_get_shell (item);
gimp_canvas_set_grid_style (gimp_canvas_item_get_canvas (item), cr,
private->grid,
shell->offset_x, shell->offset_y);
cairo_stroke (cr);
}
else
{
GIMP_CANVAS_ITEM_CLASS (parent_class)->stroke (item, cr);
}
}
GimpCanvasItem *
gimp_canvas_grid_new (GimpDisplayShell *shell,
GimpGrid *grid)
{
g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), NULL);
g_return_val_if_fail (grid == NULL || GIMP_IS_GRID (grid), NULL);
return g_object_new (GIMP_TYPE_CANVAS_GRID,
"shell", shell,
"grid", grid,
NULL);
}
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