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-rw-r--r--app/display/gimpcanvas.c298
1 files changed, 298 insertions, 0 deletions
diff --git a/app/display/gimpcanvas.c b/app/display/gimpcanvas.c
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+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * 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 "libgimpcolor/gimpcolor.h"
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "display-types.h"
+
+#include "config/gimpdisplayconfig.h"
+
+#include "widgets/gimpwidgets-utils.h"
+
+#include "gimpcanvas.h"
+
+#include "gimp-intl.h"
+
+
+#define MAX_BATCH_SIZE 32000
+
+
+enum
+{
+ PROP_0,
+ PROP_CONFIG
+};
+
+
+/* local function prototypes */
+
+static void gimp_canvas_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec);
+static void gimp_canvas_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec);
+
+static void gimp_canvas_unrealize (GtkWidget *widget);
+static void gimp_canvas_style_set (GtkWidget *widget,
+ GtkStyle *prev_style);
+static gboolean gimp_canvas_focus_in_event (GtkWidget *widget,
+ GdkEventFocus *event);
+static gboolean gimp_canvas_focus_out_event (GtkWidget *widget,
+ GdkEventFocus *event);
+static gboolean gimp_canvas_focus (GtkWidget *widget,
+ GtkDirectionType direction);
+
+
+G_DEFINE_TYPE (GimpCanvas, gimp_canvas, GIMP_TYPE_OVERLAY_BOX)
+
+#define parent_class gimp_canvas_parent_class
+
+
+static void
+gimp_canvas_class_init (GimpCanvasClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+ GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
+
+ object_class->set_property = gimp_canvas_set_property;
+ object_class->get_property = gimp_canvas_get_property;
+
+ widget_class->unrealize = gimp_canvas_unrealize;
+ widget_class->style_set = gimp_canvas_style_set;
+ widget_class->focus_in_event = gimp_canvas_focus_in_event;
+ widget_class->focus_out_event = gimp_canvas_focus_out_event;
+ widget_class->focus = gimp_canvas_focus;
+
+ g_object_class_install_property (object_class, PROP_CONFIG,
+ g_param_spec_object ("config", NULL, NULL,
+ GIMP_TYPE_DISPLAY_CONFIG,
+ GIMP_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT_ONLY));
+}
+
+static void
+gimp_canvas_init (GimpCanvas *canvas)
+{
+ GtkWidget *widget = GTK_WIDGET (canvas);
+
+ gtk_widget_set_can_focus (widget, TRUE);
+ gtk_widget_add_events (widget, GIMP_CANVAS_EVENT_MASK);
+ gtk_widget_set_extension_events (widget, GDK_EXTENSION_EVENTS_ALL);
+}
+
+static void
+gimp_canvas_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ GimpCanvas *canvas = GIMP_CANVAS (object);
+
+ switch (property_id)
+ {
+ case PROP_CONFIG:
+ canvas->config = g_value_get_object (value); /* don't dup */
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_canvas_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ GimpCanvas *canvas = GIMP_CANVAS (object);
+
+ switch (property_id)
+ {
+ case PROP_CONFIG:
+ g_value_set_object (value, canvas->config);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_canvas_unrealize (GtkWidget *widget)
+{
+ GimpCanvas *canvas = GIMP_CANVAS (widget);
+
+ g_clear_object (&canvas->layout);
+
+ GTK_WIDGET_CLASS (parent_class)->unrealize (widget);
+}
+
+static void
+gimp_canvas_style_set (GtkWidget *widget,
+ GtkStyle *prev_style)
+{
+ GimpCanvas *canvas = GIMP_CANVAS (widget);
+
+ GTK_WIDGET_CLASS (parent_class)->style_set (widget, prev_style);
+
+ g_clear_object (&canvas->layout);
+}
+
+static gboolean
+gimp_canvas_focus_in_event (GtkWidget *widget,
+ GdkEventFocus *event)
+{
+ /* don't allow the default impl to invalidate the whole widget,
+ * we don't draw a focus indicator anyway.
+ */
+ return FALSE;
+}
+
+static gboolean
+gimp_canvas_focus_out_event (GtkWidget *widget,
+ GdkEventFocus *event)
+{
+ /* see focus-in-event
+ */
+ return FALSE;
+}
+
+static gboolean
+gimp_canvas_focus (GtkWidget *widget,
+ GtkDirectionType direction)
+{
+ GtkWidget *focus = gtk_container_get_focus_child (GTK_CONTAINER (widget));
+
+ /* override GtkContainer's focus() implementation which would always
+ * give focus to the canvas because it is focussable. Instead, try
+ * navigating in the focused overlay child first, and use
+ * GtkContainer's default implementation only if that fails (which
+ * happens when focus navigation leaves the overlay child).
+ */
+
+ if (focus && gtk_widget_child_focus (focus, direction))
+ return TRUE;
+
+ return GTK_WIDGET_CLASS (parent_class)->focus (widget, direction);
+}
+
+
+/* public functions */
+
+/**
+ * gimp_canvas_new:
+ *
+ * Creates a new #GimpCanvas widget.
+ *
+ * The #GimpCanvas widget is a #GtkDrawingArea abstraction. It manages
+ * a set of graphic contexts for drawing on a GIMP display. If you
+ * draw using a #GimpCanvasStyle, #GimpCanvas makes sure that the
+ * associated #GdkGC is created. All drawing on the canvas needs to
+ * happen by means of the #GimpCanvas drawing functions. Besides from
+ * not needing a #GdkGC pointer, the #GimpCanvas drawing functions
+ * look and work like their #GdkDrawable counterparts. #GimpCanvas
+ * gracefully handles attempts to draw on the unrealized widget.
+ *
+ * Return value: a new #GimpCanvas widget
+ **/
+GtkWidget *
+gimp_canvas_new (GimpDisplayConfig *config)
+{
+ g_return_val_if_fail (GIMP_IS_DISPLAY_CONFIG (config), NULL);
+
+ return g_object_new (GIMP_TYPE_CANVAS,
+ "name", "gimp-canvas",
+ "config", config,
+ NULL);
+}
+
+/**
+ * gimp_canvas_get_layout:
+ * @canvas: a #GimpCanvas widget
+ * @format: a standard printf() format string.
+ * @Varargs: the parameters to insert into the format string.
+ *
+ * Returns a layout which can be used for
+ * pango_cairo_show_layout(). The layout belongs to the canvas and
+ * should not be freed, not should a pointer to it be kept around
+ * after drawing.
+ *
+ * Returns: a #PangoLayout owned by the canvas.
+ **/
+PangoLayout *
+gimp_canvas_get_layout (GimpCanvas *canvas,
+ const gchar *format,
+ ...)
+{
+ va_list args;
+ gchar *text;
+
+ if (! canvas->layout)
+ canvas->layout = gtk_widget_create_pango_layout (GTK_WIDGET (canvas),
+ NULL);
+
+ va_start (args, format);
+ text = g_strdup_vprintf (format, args);
+ va_end (args);
+
+ pango_layout_set_text (canvas->layout, text, -1);
+ g_free (text);
+
+ return canvas->layout;
+}
+
+/**
+ * gimp_canvas_set_bg_color:
+ * @canvas: a #GimpCanvas widget
+ * @color: a color in #GimpRGB format
+ *
+ * Sets the background color of the canvas's window. This
+ * is the color the canvas is set to if it is cleared.
+ **/
+void
+gimp_canvas_set_bg_color (GimpCanvas *canvas,
+ GimpRGB *color)
+{
+ GtkWidget *widget = GTK_WIDGET (canvas);
+ GdkColormap *colormap;
+ GdkColor gdk_color;
+
+ if (! gtk_widget_get_realized (widget))
+ return;
+
+ gimp_rgb_get_gdk_color (color, &gdk_color);
+
+ colormap = gdk_drawable_get_colormap (gtk_widget_get_window (widget));
+ g_return_if_fail (colormap != NULL);
+ gdk_colormap_alloc_color (colormap, &gdk_color, FALSE, TRUE);
+
+ gdk_window_set_background (gtk_widget_get_window (widget), &gdk_color);
+
+ gtk_widget_queue_draw (GTK_WIDGET (canvas));
+}
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