app/display: add new canvas item GimpCanvasPassePartout

This is supposed to replace the GimpDisplayShell highlight API, but it is not yet used.
2010-10-18 22:15:34 +02:00
parent 8c42c38c7e
commit a798c9456c
6 changed files with 207 additions and 6 deletions
--- a/app/display/gimpcanvaspassepartout.c
+++ b/app/display/gimpcanvaspassepartout.c
@ -0,0 +1,140 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpcanvaspassepartout.c
+ * Copyright (C) 2010 Sven Neumann <sven@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 <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl.h>
+#include <gtk/gtk.h>
+
+#include "display-types.h"
+
+#include "gimpcanvas.h"
+#include "gimpcanvaspassepartout.h"
+#include "gimpdisplayshell.h"
+#include "gimpdisplayshell-draw.h"
+#include "gimpdisplayshell-style.h"
+
+
+/*  local function prototypes  */
+
+static void             gimp_canvas_passe_partout_draw        (GimpCanvasItem   *item,
+                                                               GimpDisplayShell *shell,
+                                                               cairo_t          *cr);
+static cairo_region_t * gimp_canvas_passe_partout_get_extents (GimpCanvasItem   *item,
+                                                               GimpDisplayShell *shell);
+static void             gimp_canvas_passe_partout_fill        (GimpCanvasItem   *item,
+                                                               GimpDisplayShell *shell,
+                                                               cairo_t          *cr);
+
+
+G_DEFINE_TYPE (GimpCanvasPassePartout, gimp_canvas_passe_partout,
+               GIMP_TYPE_CANVAS_RECTANGLE)
+
+#define parent_class gimp_canvas_passe_partout_parent_class
+
+
+static void
+gimp_canvas_passe_partout_class_init (GimpCanvasPassePartoutClass *klass)
+{
+  GimpCanvasItemClass *item_class = GIMP_CANVAS_ITEM_CLASS (klass);
+
+  item_class->draw        = gimp_canvas_passe_partout_draw;
+  item_class->get_extents = gimp_canvas_passe_partout_get_extents;
+  item_class->fill        = gimp_canvas_passe_partout_fill;
+}
+
+static void
+gimp_canvas_passe_partout_init (GimpCanvasPassePartout *passe_partout)
+{
+}
+
+static void
+gimp_canvas_passe_partout_draw (GimpCanvasItem   *item,
+                                GimpDisplayShell *shell,
+                                cairo_t          *cr)
+{
+  gint w, h;
+
+  gimp_display_shell_draw_get_scaled_image_size (shell, &w, &h);
+
+  cairo_rectangle (cr, - shell->offset_x, - shell->offset_y, w, h);
+
+  GIMP_CANVAS_ITEM_CLASS (parent_class)->draw (item, shell, cr);
+}
+
+static cairo_region_t *
+gimp_canvas_passe_partout_get_extents (GimpCanvasItem   *item,
+                                       GimpDisplayShell *shell)
+{
+  cairo_region_t *inner;
+  cairo_region_t *outer;
+  GdkRectangle    rect = { 0, 0, 0, 0 };
+
+  gimp_display_shell_draw_get_scaled_image_size (shell,
+                                                 &rect.width, &rect.height);
+#ifdef USE_CAIRO_REGION
+  outer = cairo_region_create_rectangle ((cairo_rectangle_int_t *) &rect);
+#else
+  outer = gdk_region_rectangle (&rect);
+#endif
+
+  inner = GIMP_CANVAS_ITEM_CLASS (parent_class)->get_extents (item, shell);
+
+#ifdef USE_CAIRO_REGION
+  cairo_region_subtract (outer, inner);
+#else
+  gdk_region_subtract (outer, inner);
+#endif
+
+  return outer;
+}
+
+static void
+gimp_canvas_passe_partout_fill (GimpCanvasItem   *item,
+                                GimpDisplayShell *shell,
+                                cairo_t          *cr)
+{
+  cairo_translate (cr, -shell->offset_x, -shell->offset_y);
+
+  cairo_set_fill_rule (cr, CAIRO_FILL_RULE_EVEN_ODD);
+  cairo_clip (cr);
+
+  gimp_display_shell_set_passe_partout_style (shell, cr);
+  cairo_paint (cr);
+}
+
+GimpCanvasItem *
+gimp_canvas_passe_partout_new (GimpDisplayShell *shell,
+                               gdouble           x,
+                               gdouble           y,
+                               gdouble           width,
+                               gdouble           height)
+{
+  g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), NULL);
+
+  return g_object_new (GIMP_TYPE_CANVAS_PASSE_PARTOUT,
+                       "shell", shell,
+                       "x",      x,
+                       "y",      y,
+                       "width",  width,
+                       "height", height,
+                       "filled", TRUE,
+                       NULL);
+}