app: some cairo tool drawing infrastructure for review, please have a look

2010-09-19 19:45:51 +02:00
parent 11aecbd090
commit 69a898cc9f
5 changed files with 547 additions and 0 deletions
--- a/app/display/gimpcanvasitem.c
+++ b/app/display/gimpcanvasitem.c
@ -0,0 +1,120 @@
+/* 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 <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl.h>
+#include <gtk/gtk.h>
+
+#include "display-types.h"
+
+#include "gimpcanvasitem.h"
+#include "gimpdisplayshell.h"
+#include "gimpdisplayshell-style.h"
+
+
+/*  local function prototypes  */
+
+static void   gimp_canvas_item_real_draw       (GimpCanvasItem   *item,
+                                                GimpDisplayShell *shell,
+                                                cairo_t          *cr);
+static void   gimp_canvas_item_real_invalidate (GimpCanvasItem   *item,
+                                                GimpDisplayShell *shell);
+
+
+G_DEFINE_TYPE (GimpCanvasItem, gimp_canvas_item,
+               GIMP_TYPE_OBJECT)
+
+#define parent_class gimp_canvas_item_parent_class
+
+
+static void
+gimp_canvas_item_class_init (GimpCanvasItemClass *klass)
+{
+  klass->draw       = gimp_canvas_item_real_draw;
+  klass->invalidate = gimp_canvas_item_real_invalidate;
+}
+
+static void
+gimp_canvas_item_init (GimpCanvasItem *item)
+{
+}
+
+static void
+gimp_canvas_item_real_draw (GimpCanvasItem   *item,
+                            GimpDisplayShell *shell,
+                            cairo_t          *cr)
+{
+  g_warn_if_reached ();
+}
+
+static void
+gimp_canvas_item_real_invalidate (GimpCanvasItem   *item,
+                                  GimpDisplayShell *shell)
+{
+  g_warn_if_reached ();
+}
+
+
+/*  public functions  */
+
+void
+gimp_canvas_item_draw (GimpCanvasItem   *item,
+                       GimpDisplayShell *shell,
+                       cairo_t          *cr)
+{
+  g_return_if_fail (GIMP_IS_CANVAS_ITEM (item));
+  g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
+  g_return_if_fail (cr != NULL);
+
+  cairo_save (cr);
+
+  GIMP_CANVAS_ITEM_GET_CLASS (item)->draw (item, shell, cr);
+
+  cairo_restore (cr);
+}
+
+void
+gimp_canvas_item_invalidate (GimpCanvasItem   *item,
+                             GimpDisplayShell *shell)
+{
+  g_return_if_fail (GIMP_IS_CANVAS_ITEM (item));
+  g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
+
+  GIMP_CANVAS_ITEM_GET_CLASS (item)->invalidate (item, shell);
+}
+
+void
+_gimp_canvas_item_stroke (GimpCanvasItem   *item,
+                          GimpDisplayShell *shell,
+                          cairo_t          *cr)
+{
+  gimp_display_shell_set_tool_bg_style (shell, cr);
+  cairo_stroke_preserve (cr);
+
+  gimp_display_shell_set_tool_fg_style (shell, cr);
+  cairo_stroke (cr);
+}
+
+void
+_gimp_canvas_item_fill (GimpCanvasItem   *item,
+                        GimpDisplayShell *shell,
+                        cairo_t          *cr)
+{
+  gimp_display_shell_set_tool_fg_style (shell, cr);
+  cairo_fill (cr);
+}