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-rw-r--r--app/display/gimpcanvasgrid.c414
1 files changed, 414 insertions, 0 deletions
diff --git a/app/display/gimpcanvasgrid.c b/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 "gimpcanvasitem-utils.h"
+#include "gimpdisplayshell.h"
+#include "gimpdisplayshell-scale.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);
+ gdouble xspacing, yspacing;
+ gdouble xoffset, yoffset;
+ gboolean vert, horz;
+ gdouble dx1, dy1, dx2, dy2;
+ gint x1, y1, x2, y2;
+ gdouble dx, dy;
+ gint x, y;
+
+#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);
+
+ xspacing *= shell->scale_x;
+ yspacing *= shell->scale_y;
+
+ xoffset *= shell->scale_x;
+ yoffset *= shell->scale_y;
+
+ /* skip grid drawing when the space between grid lines starts
+ * disappearing, see bug #599267.
+ */
+ vert = (xspacing >= 2.0);
+ horz = (yspacing >= 2.0);
+
+ if (! vert && ! horz)
+ return;
+
+ cairo_clip_extents (cr, &dx1, &dy1, &dx2, &dy2);
+
+ x1 = floor (dx1) - 1;
+ y1 = floor (dy1) - 1;
+ x2 = ceil (dx2) + 1;
+ y2 = ceil (dy2) + 1;
+
+ if (! gimp_display_shell_get_infinite_canvas (shell))
+ {
+ GeglRectangle bounds;
+
+ gimp_display_shell_scale_get_image_unrotated_bounds (
+ shell,
+ &bounds.x, &bounds.y, &bounds.width, &bounds.height);
+
+ if (! gegl_rectangle_intersect (&bounds,
+ &bounds,
+ GEGL_RECTANGLE (x1, y1,
+ x2 - x1, y2 - y1)))
+ {
+ return;
+ }
+
+ x1 = bounds.x;
+ y1 = bounds.y;
+ x2 = bounds.x + bounds.width;
+ y2 = bounds.y + bounds.height;
+ }
+
+ switch (gimp_grid_get_style (private->grid))
+ {
+ case GIMP_GRID_INTERSECTIONS:
+ x1 -= CROSSHAIR;
+ y1 -= CROSSHAIR;
+ x2 += CROSSHAIR;
+ y2 += CROSSHAIR;
+ break;
+
+ case GIMP_GRID_DOTS:
+ case GIMP_GRID_ON_OFF_DASH:
+ case GIMP_GRID_DOUBLE_DASH:
+ case GIMP_GRID_SOLID:
+ break;
+ }
+
+ xoffset = fmod (xoffset - shell->offset_x - x1, xspacing);
+ yoffset = fmod (yoffset - shell->offset_y - y1, yspacing);
+
+ if (xoffset < 0.0)
+ xoffset += xspacing;
+
+ if (yoffset < 0.0)
+ yoffset += yspacing;
+
+ switch (gimp_grid_get_style (private->grid))
+ {
+ case GIMP_GRID_DOTS:
+ if (vert && horz)
+ {
+ for (dx = x1 + xoffset; dx <= x2; dx += xspacing)
+ {
+ x = RINT (dx);
+
+ for (dy = y1 + yoffset; dy <= y2; dy += yspacing)
+ {
+ y = RINT (dy);
+
+ cairo_move_to (cr, x, y + 0.5);
+ cairo_line_to (cr, x + 1.0, y + 0.5);
+ }
+ }
+ }
+ break;
+
+ case GIMP_GRID_INTERSECTIONS:
+ if (vert && horz)
+ {
+ for (dx = x1 + xoffset; dx <= x2; dx += xspacing)
+ {
+ x = RINT (dx);
+
+ for (dy = y1 + yoffset; dy <= y2; dy += yspacing)
+ {
+ y = RINT (dy);
+
+ cairo_move_to (cr, x + 0.5, y - CROSSHAIR);
+ cairo_line_to (cr, x + 0.5, y + CROSSHAIR + 1.0);
+
+ cairo_move_to (cr, x - CROSSHAIR, y + 0.5);
+ cairo_line_to (cr, x + CROSSHAIR + 1.0, y + 0.5);
+ }
+ }
+ }
+ break;
+
+ case GIMP_GRID_ON_OFF_DASH:
+ case GIMP_GRID_DOUBLE_DASH:
+ case GIMP_GRID_SOLID:
+ if (vert)
+ {
+ for (dx = x1 + xoffset; dx < x2; dx += xspacing)
+ {
+ x = RINT (dx);
+
+ cairo_move_to (cr, x + 0.5, y1);
+ cairo_line_to (cr, x + 0.5, y2);
+ }
+ }
+
+ if (horz)
+ {
+ for (dy = y1 + yoffset; dy < y2; dy += yspacing)
+ {
+ y = RINT (dy);
+
+ cairo_move_to (cr, x1, y + 0.5);
+ cairo_line_to (cr, x2, y + 0.5);
+ }
+ }
+ break;
+ }
+
+ _gimp_canvas_item_stroke (item, cr);
+}
+
+static cairo_region_t *
+gimp_canvas_grid_get_extents (GimpCanvasItem *item)
+{
+ GimpDisplayShell *shell = gimp_canvas_item_get_shell (item);
+ GimpImage *image = gimp_canvas_item_get_image (item);
+ cairo_rectangle_int_t rectangle;
+
+ if (! image)
+ return NULL;
+
+ if (! gimp_display_shell_get_infinite_canvas (shell))
+ {
+
+ gdouble x1, y1;
+ gdouble x2, y2;
+ gint w, h;
+
+ 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;
+ }
+ else
+ {
+ gimp_canvas_item_untransform_viewport (item,
+ &rectangle.x,
+ &rectangle.y,
+ &rectangle.width,
+ &rectangle.height);
+ }
+
+ 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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