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-rw-r--r--app/display/gimpcanvasitem.c731
1 files changed, 731 insertions, 0 deletions
diff --git a/app/display/gimpcanvasitem.c b/app/display/gimpcanvasitem.c
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--- /dev/null
+++ b/app/display/gimpcanvasitem.c
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+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpcanvasitem.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 "libgimpmath/gimpmath.h"
+
+#include "display-types.h"
+
+#include "core/gimpmarshal.h"
+
+#include "gimpcanvas-style.h"
+#include "gimpcanvasitem.h"
+#include "gimpdisplay.h"
+#include "gimpdisplayshell.h"
+#include "gimpdisplayshell-transform.h"
+
+
+enum
+{
+ PROP_0,
+ PROP_SHELL,
+ PROP_VISIBLE,
+ PROP_LINE_CAP,
+ PROP_HIGHLIGHT
+};
+
+enum
+{
+ UPDATE,
+ LAST_SIGNAL
+};
+
+
+struct _GimpCanvasItemPrivate
+{
+ GimpDisplayShell *shell;
+ gboolean visible;
+ cairo_line_cap_t line_cap;
+ gboolean highlight;
+ gint suspend_stroking;
+ gint suspend_filling;
+ gint change_count;
+ cairo_region_t *change_region;
+};
+
+
+/* local function prototypes */
+
+static void gimp_canvas_item_dispose (GObject *object);
+static void gimp_canvas_item_constructed (GObject *object);
+static void gimp_canvas_item_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec);
+static void gimp_canvas_item_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec);
+static void gimp_canvas_item_dispatch_properties_changed (GObject *object,
+ guint n_pspecs,
+ GParamSpec **pspecs);
+
+static void gimp_canvas_item_real_draw (GimpCanvasItem *item,
+ cairo_t *cr);
+static cairo_region_t * gimp_canvas_item_real_get_extents (GimpCanvasItem *item);
+static void gimp_canvas_item_real_stroke (GimpCanvasItem *item,
+ cairo_t *cr);
+static void gimp_canvas_item_real_fill (GimpCanvasItem *item,
+ cairo_t *cr);
+static gboolean gimp_canvas_item_real_hit (GimpCanvasItem *item,
+ gdouble x,
+ gdouble y);
+
+
+G_DEFINE_TYPE_WITH_PRIVATE (GimpCanvasItem, gimp_canvas_item, GIMP_TYPE_OBJECT)
+
+#define parent_class gimp_canvas_item_parent_class
+
+static guint item_signals[LAST_SIGNAL] = { 0 };
+
+
+static void
+gimp_canvas_item_class_init (GimpCanvasItemClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+ object_class->dispose = gimp_canvas_item_dispose;
+ object_class->constructed = gimp_canvas_item_constructed;
+ object_class->set_property = gimp_canvas_item_set_property;
+ object_class->get_property = gimp_canvas_item_get_property;
+ object_class->dispatch_properties_changed = gimp_canvas_item_dispatch_properties_changed;
+
+ klass->update = NULL;
+ klass->draw = gimp_canvas_item_real_draw;
+ klass->get_extents = gimp_canvas_item_real_get_extents;
+ klass->stroke = gimp_canvas_item_real_stroke;
+ klass->fill = gimp_canvas_item_real_fill;
+ klass->hit = gimp_canvas_item_real_hit;
+
+ item_signals[UPDATE] =
+ g_signal_new ("update",
+ G_TYPE_FROM_CLASS (klass),
+ G_SIGNAL_RUN_FIRST,
+ G_STRUCT_OFFSET (GimpCanvasItemClass, update),
+ NULL, NULL,
+ gimp_marshal_VOID__POINTER,
+ G_TYPE_NONE, 1,
+ G_TYPE_POINTER);
+
+ g_object_class_install_property (object_class, PROP_SHELL,
+ g_param_spec_object ("shell",
+ NULL, NULL,
+ GIMP_TYPE_DISPLAY_SHELL,
+ GIMP_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT_ONLY));
+
+ g_object_class_install_property (object_class, PROP_VISIBLE,
+ g_param_spec_boolean ("visible",
+ NULL, NULL,
+ TRUE,
+ GIMP_PARAM_READWRITE));
+
+ g_object_class_install_property (object_class, PROP_LINE_CAP,
+ g_param_spec_int ("line-cap",
+ NULL, NULL,
+ CAIRO_LINE_CAP_BUTT,
+ CAIRO_LINE_CAP_SQUARE,
+ CAIRO_LINE_CAP_ROUND,
+ GIMP_PARAM_READWRITE));
+
+ g_object_class_install_property (object_class, PROP_HIGHLIGHT,
+ g_param_spec_boolean ("highlight",
+ NULL, NULL,
+ FALSE,
+ GIMP_PARAM_READWRITE));
+}
+
+static void
+gimp_canvas_item_init (GimpCanvasItem *item)
+{
+ GimpCanvasItemPrivate *private;
+
+ item->private = gimp_canvas_item_get_instance_private (item);
+ private = item->private;
+
+ private->shell = NULL;
+ private->visible = TRUE;
+ private->line_cap = CAIRO_LINE_CAP_ROUND;
+ private->highlight = FALSE;
+ private->suspend_stroking = 0;
+ private->suspend_filling = 0;
+ private->change_count = 1; /* avoid emissions during construction */
+ private->change_region = NULL;
+}
+
+static void
+gimp_canvas_item_constructed (GObject *object)
+{
+ GimpCanvasItem *item = GIMP_CANVAS_ITEM (object);
+
+ gimp_assert (GIMP_IS_DISPLAY_SHELL (item->private->shell));
+
+ item->private->change_count = 0; /* undo hack from init() */
+
+ G_OBJECT_CLASS (parent_class)->constructed (object);
+}
+
+static void
+gimp_canvas_item_dispose (GObject *object)
+{
+ GimpCanvasItem *item = GIMP_CANVAS_ITEM (object);
+
+ item->private->change_count++; /* avoid emissions during destruction */
+
+ G_OBJECT_CLASS (parent_class)->dispose (object);
+}
+
+static void
+gimp_canvas_item_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ GimpCanvasItem *item = GIMP_CANVAS_ITEM (object);
+ GimpCanvasItemPrivate *private = item->private;
+
+ switch (property_id)
+ {
+ case PROP_SHELL:
+ private->shell = g_value_get_object (value); /* don't ref */
+ break;
+ case PROP_VISIBLE:
+ private->visible = g_value_get_boolean (value);
+ break;
+ case PROP_LINE_CAP:
+ private->line_cap = g_value_get_int (value);
+ break;
+ case PROP_HIGHLIGHT:
+ private->highlight = g_value_get_boolean (value);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_canvas_item_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ GimpCanvasItem *item = GIMP_CANVAS_ITEM (object);
+ GimpCanvasItemPrivate *private = item->private;
+
+ switch (property_id)
+ {
+ case PROP_SHELL:
+ g_value_set_object (value, private->shell);
+ break;
+ case PROP_VISIBLE:
+ g_value_set_boolean (value, private->visible);
+ break;
+ case PROP_LINE_CAP:
+ g_value_set_int (value, private->line_cap);
+ break;
+ case PROP_HIGHLIGHT:
+ g_value_set_boolean (value, private->highlight);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_canvas_item_dispatch_properties_changed (GObject *object,
+ guint n_pspecs,
+ GParamSpec **pspecs)
+{
+ GimpCanvasItem *item = GIMP_CANVAS_ITEM (object);
+
+ G_OBJECT_CLASS (parent_class)->dispatch_properties_changed (object,
+ n_pspecs,
+ pspecs);
+
+ if (_gimp_canvas_item_needs_update (item))
+ {
+ cairo_region_t *region = gimp_canvas_item_get_extents (item);
+
+ if (region)
+ {
+ g_signal_emit (object, item_signals[UPDATE], 0,
+ region);
+ cairo_region_destroy (region);
+ }
+ }
+}
+
+static void
+gimp_canvas_item_real_draw (GimpCanvasItem *item,
+ cairo_t *cr)
+{
+ g_warn_if_reached ();
+}
+
+static cairo_region_t *
+gimp_canvas_item_real_get_extents (GimpCanvasItem *item)
+{
+ return NULL;
+}
+
+static void
+gimp_canvas_item_real_stroke (GimpCanvasItem *item,
+ cairo_t *cr)
+{
+ cairo_set_line_cap (cr, item->private->line_cap);
+
+ gimp_canvas_set_tool_bg_style (gimp_canvas_item_get_canvas (item), cr);
+ cairo_stroke_preserve (cr);
+
+ gimp_canvas_set_tool_fg_style (gimp_canvas_item_get_canvas (item), cr,
+ item->private->highlight);
+ cairo_stroke (cr);
+}
+
+static void
+gimp_canvas_item_real_fill (GimpCanvasItem *item,
+ cairo_t *cr)
+{
+ gimp_canvas_set_tool_bg_style (gimp_canvas_item_get_canvas (item), cr);
+ cairo_set_line_width (cr, 2.0);
+ cairo_stroke_preserve (cr);
+
+ gimp_canvas_set_tool_fg_style (gimp_canvas_item_get_canvas (item), cr,
+ item->private->highlight);
+ cairo_fill (cr);
+}
+
+static gboolean
+gimp_canvas_item_real_hit (GimpCanvasItem *item,
+ gdouble x,
+ gdouble y)
+{
+ return FALSE;
+}
+
+
+/* public functions */
+
+GimpDisplayShell *
+gimp_canvas_item_get_shell (GimpCanvasItem *item)
+{
+ g_return_val_if_fail (GIMP_IS_CANVAS_ITEM (item), NULL);
+
+ return item->private->shell;
+}
+
+GimpImage *
+gimp_canvas_item_get_image (GimpCanvasItem *item)
+{
+ g_return_val_if_fail (GIMP_IS_CANVAS_ITEM (item), NULL);
+
+ return gimp_display_get_image (item->private->shell->display);
+}
+
+GtkWidget *
+gimp_canvas_item_get_canvas (GimpCanvasItem *item)
+{
+ g_return_val_if_fail (GIMP_IS_CANVAS_ITEM (item), NULL);
+
+ return item->private->shell->canvas;
+}
+
+void
+gimp_canvas_item_draw (GimpCanvasItem *item,
+ cairo_t *cr)
+{
+ g_return_if_fail (GIMP_IS_CANVAS_ITEM (item));
+ g_return_if_fail (cr != NULL);
+
+ if (item->private->visible)
+ {
+ cairo_save (cr);
+ GIMP_CANVAS_ITEM_GET_CLASS (item)->draw (item, cr);
+ cairo_restore (cr);
+ }
+}
+
+cairo_region_t *
+gimp_canvas_item_get_extents (GimpCanvasItem *item)
+{
+ g_return_val_if_fail (GIMP_IS_CANVAS_ITEM (item), NULL);
+
+ if (item->private->visible)
+ return GIMP_CANVAS_ITEM_GET_CLASS (item)->get_extents (item);
+
+ return NULL;
+}
+
+gboolean
+gimp_canvas_item_hit (GimpCanvasItem *item,
+ gdouble x,
+ gdouble y)
+{
+ g_return_val_if_fail (GIMP_IS_CANVAS_ITEM (item), FALSE);
+
+ if (item->private->visible)
+ return GIMP_CANVAS_ITEM_GET_CLASS (item)->hit (item, x, y);
+
+ return FALSE;
+}
+
+void
+gimp_canvas_item_set_visible (GimpCanvasItem *item,
+ gboolean visible)
+{
+ g_return_if_fail (GIMP_IS_CANVAS_ITEM (item));
+
+ if (item->private->visible != visible)
+ {
+ gimp_canvas_item_begin_change (item);
+ g_object_set (G_OBJECT (item),
+ "visible", visible,
+ NULL);
+ gimp_canvas_item_end_change (item);
+ }
+}
+
+gboolean
+gimp_canvas_item_get_visible (GimpCanvasItem *item)
+{
+ g_return_val_if_fail (GIMP_IS_CANVAS_ITEM (item), FALSE);
+
+ return item->private->visible;
+}
+
+void
+gimp_canvas_item_set_line_cap (GimpCanvasItem *item,
+ cairo_line_cap_t line_cap)
+{
+ g_return_if_fail (GIMP_IS_CANVAS_ITEM (item));
+
+ if (item->private->line_cap != line_cap)
+ {
+ gimp_canvas_item_begin_change (item);
+ g_object_set (G_OBJECT (item),
+ "line-cap", line_cap,
+ NULL);
+ gimp_canvas_item_end_change (item);
+ }
+}
+
+void
+gimp_canvas_item_set_highlight (GimpCanvasItem *item,
+ gboolean highlight)
+{
+ g_return_if_fail (GIMP_IS_CANVAS_ITEM (item));
+
+ if (item->private->highlight != highlight)
+ {
+ g_object_set (G_OBJECT (item),
+ "highlight", highlight,
+ NULL);
+ }
+}
+
+gboolean
+gimp_canvas_item_get_highlight (GimpCanvasItem *item)
+{
+ g_return_val_if_fail (GIMP_IS_CANVAS_ITEM (item), FALSE);
+
+ return item->private->highlight;
+}
+
+void
+gimp_canvas_item_begin_change (GimpCanvasItem *item)
+{
+ GimpCanvasItemPrivate *private;
+
+ g_return_if_fail (GIMP_IS_CANVAS_ITEM (item));
+
+ private = item->private;
+
+ private->change_count++;
+
+ if (private->change_count == 1 &&
+ g_signal_has_handler_pending (item, item_signals[UPDATE], 0, FALSE))
+ {
+ private->change_region = gimp_canvas_item_get_extents (item);
+ }
+}
+
+void
+gimp_canvas_item_end_change (GimpCanvasItem *item)
+{
+ GimpCanvasItemPrivate *private;
+
+ g_return_if_fail (GIMP_IS_CANVAS_ITEM (item));
+
+ private = item->private;
+
+ g_return_if_fail (private->change_count > 0);
+
+ private->change_count--;
+
+ if (private->change_count == 0)
+ {
+ if (g_signal_has_handler_pending (item, item_signals[UPDATE], 0, FALSE))
+ {
+ cairo_region_t *region = gimp_canvas_item_get_extents (item);
+
+ if (! region)
+ {
+ region = private->change_region;
+ }
+ else if (private->change_region)
+ {
+ cairo_region_union (region, private->change_region);
+ cairo_region_destroy (private->change_region);
+ }
+
+ private->change_region = NULL;
+
+ if (region)
+ {
+ g_signal_emit (item, item_signals[UPDATE], 0,
+ region);
+ cairo_region_destroy (region);
+ }
+ }
+ else
+ {
+ g_clear_pointer (&private->change_region, cairo_region_destroy);
+ }
+ }
+}
+
+void
+gimp_canvas_item_suspend_stroking (GimpCanvasItem *item)
+{
+ g_return_if_fail (GIMP_IS_CANVAS_ITEM (item));
+
+ item->private->suspend_stroking++;
+}
+
+void
+gimp_canvas_item_resume_stroking (GimpCanvasItem *item)
+{
+ g_return_if_fail (GIMP_IS_CANVAS_ITEM (item));
+
+ g_return_if_fail (item->private->suspend_stroking > 0);
+
+ item->private->suspend_stroking--;
+}
+
+void
+gimp_canvas_item_suspend_filling (GimpCanvasItem *item)
+{
+ g_return_if_fail (GIMP_IS_CANVAS_ITEM (item));
+
+ item->private->suspend_filling++;
+}
+
+void
+gimp_canvas_item_resume_filling (GimpCanvasItem *item)
+{
+ g_return_if_fail (GIMP_IS_CANVAS_ITEM (item));
+
+ g_return_if_fail (item->private->suspend_filling > 0);
+
+ item->private->suspend_filling--;
+}
+
+void
+gimp_canvas_item_transform (GimpCanvasItem *item,
+ cairo_t *cr)
+{
+ GimpCanvasItemPrivate *private;
+
+ g_return_if_fail (GIMP_IS_CANVAS_ITEM (item));
+ g_return_if_fail (cr != NULL);
+
+ private = item->private;
+
+ cairo_translate (cr, -private->shell->offset_x, -private->shell->offset_y);
+ cairo_scale (cr, private->shell->scale_x, private->shell->scale_y);
+}
+
+void
+gimp_canvas_item_transform_xy (GimpCanvasItem *item,
+ gdouble x,
+ gdouble y,
+ gint *tx,
+ gint *ty)
+{
+ g_return_if_fail (GIMP_IS_CANVAS_ITEM (item));
+
+ gimp_display_shell_zoom_xy (item->private->shell, x, y, tx, ty);
+}
+
+void
+gimp_canvas_item_transform_xy_f (GimpCanvasItem *item,
+ gdouble x,
+ gdouble y,
+ gdouble *tx,
+ gdouble *ty)
+{
+ g_return_if_fail (GIMP_IS_CANVAS_ITEM (item));
+
+ gimp_display_shell_zoom_xy_f (item->private->shell, x, y, tx, ty);
+}
+
+/**
+ * gimp_canvas_item_transform_distance:
+ * @item: a #GimpCanvasItem
+ * @x1: start point X in image coordinates
+ * @y1: start point Y in image coordinates
+ * @x2: end point X in image coordinates
+ * @y2: end point Y in image coordinates
+ *
+ * If you just need to compare distances, consider to use
+ * gimp_canvas_item_transform_distance_square() instead.
+ *
+ * Returns: the distance between the given points in display coordinates
+ **/
+gdouble
+gimp_canvas_item_transform_distance (GimpCanvasItem *item,
+ gdouble x1,
+ gdouble y1,
+ gdouble x2,
+ gdouble y2)
+{
+ return sqrt (gimp_canvas_item_transform_distance_square (item,
+ x1, y1, x2, y2));
+}
+
+/**
+ * gimp_canvas_item_transform_distance_square:
+ * @item: a #GimpCanvasItem
+ * @x1: start point X in image coordinates
+ * @y1: start point Y in image coordinates
+ * @x2: end point X in image coordinates
+ * @y2: end point Y in image coordinates
+ *
+ * This function is more effective than
+ * gimp_canvas_item_transform_distance() as it doesn't perform a
+ * sqrt(). Use this if you just need to compare distances.
+ *
+ * Returns: the square of the distance between the given points in
+ * display coordinates
+ **/
+gdouble
+gimp_canvas_item_transform_distance_square (GimpCanvasItem *item,
+ gdouble x1,
+ gdouble y1,
+ gdouble x2,
+ gdouble y2)
+{
+ gdouble tx1, ty1;
+ gdouble tx2, ty2;
+
+ g_return_val_if_fail (GIMP_IS_CANVAS_ITEM (item), 0.0);
+
+ gimp_canvas_item_transform_xy_f (item, x1, y1, &tx1, &ty1);
+ gimp_canvas_item_transform_xy_f (item, x2, y2, &tx2, &ty2);
+
+ return SQR (tx2 - tx1) + SQR (ty2 - ty1);
+}
+
+void
+gimp_canvas_item_untransform_viewport (GimpCanvasItem *item,
+ gint *x,
+ gint *y,
+ gint *w,
+ gint *h)
+{
+ GimpDisplayShell *shell;
+ gdouble x1, y1;
+ gdouble x2, y2;
+
+ g_return_if_fail (GIMP_IS_CANVAS_ITEM (item));
+
+ shell = item->private->shell;
+
+ gimp_display_shell_unrotate_bounds (shell,
+ 0.0, 0.0,
+ shell->disp_width, shell->disp_height,
+ &x1, &y1,
+ &x2, &y2);
+
+ *x = floor (x1);
+ *y = floor (y1);
+ *w = ceil (x2) - *x;
+ *h = ceil (y2) - *y;
+}
+
+
+/* protected functions */
+
+void
+_gimp_canvas_item_update (GimpCanvasItem *item,
+ cairo_region_t *region)
+{
+ g_signal_emit (item, item_signals[UPDATE], 0,
+ region);
+}
+
+gboolean
+_gimp_canvas_item_needs_update (GimpCanvasItem *item)
+{
+ return (item->private->change_count == 0 &&
+ g_signal_has_handler_pending (item, item_signals[UPDATE], 0, FALSE));
+}
+
+void
+_gimp_canvas_item_stroke (GimpCanvasItem *item,
+ cairo_t *cr)
+{
+ if (item->private->suspend_filling > 0)
+ g_warning ("_gimp_canvas_item_stroke() on an item that is in a filling group");
+
+ if (item->private->suspend_stroking == 0)
+ {
+ GIMP_CANVAS_ITEM_GET_CLASS (item)->stroke (item, cr);
+ }
+ else
+ {
+ cairo_new_sub_path (cr);
+ }
+}
+
+void
+_gimp_canvas_item_fill (GimpCanvasItem *item,
+ cairo_t *cr)
+{
+ if (item->private->suspend_stroking > 0)
+ g_warning ("_gimp_canvas_item_fill() on an item that is in a stroking group");
+
+ if (item->private->suspend_filling == 0)
+ {
+ GIMP_CANVAS_ITEM_GET_CLASS (item)->fill (item, cr);
+ }
+ else
+ {
+ cairo_new_sub_path (cr);
+ }
+}
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