1 files changed, 130 insertions, 0 deletions
diff --git a/app/paint/gimperaser.c b/app/paint/gimperaser.c
new file mode 100644
index 0000000..68a535e
--- /dev/null
+++ b/app/paint/gimperaser.c
@@ -0,0 +1,130 @@
+/* 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 <gdk-pixbuf/gdk-pixbuf.h>
+#include <gegl.h>
+
+#include "paint-types.h"
+
+#include "gegl/gimp-gegl-utils.h"
+
+#include "core/gimp.h"
+#include "core/gimp-palettes.h"
+#include "core/gimpdrawable.h"
+#include "core/gimpdynamics.h"
+#include "core/gimpimage.h"
+#include "core/gimppickable.h"
+#include "core/gimpsymmetry.h"
+
+#include "gimperaser.h"
+#include "gimperaseroptions.h"
+
+#include "gimp-intl.h"
+
+
+static gboolean   gimp_eraser_get_color_history_color (GimpPaintbrush            *paintbrush,
+                                                       GimpDrawable              *drawable,
+                                                       GimpPaintOptions          *paint_options,
+                                                       GimpRGB                   *color);
+static void       gimp_eraser_get_paint_params        (GimpPaintbrush            *paintbrush,
+                                                       GimpDrawable              *drawable,
+                                                       GimpPaintOptions          *paint_options,
+                                                       GimpSymmetry              *sym,
+                                                       gdouble                    grad_point,
+                                                       GimpLayerMode             *paint_mode,
+                                                       GimpPaintApplicationMode  *paint_appl_mode,
+                                                       const GimpTempBuf        **paint_pixmap,
+                                                       GimpRGB                   *paint_color);
+
+
+G_DEFINE_TYPE (GimpEraser, gimp_eraser, GIMP_TYPE_PAINTBRUSH)
+
+
+void
+gimp_eraser_register (Gimp                      *gimp,
+                      GimpPaintRegisterCallback  callback)
+{
+  (* callback) (gimp,
+                GIMP_TYPE_ERASER,
+                GIMP_TYPE_ERASER_OPTIONS,
+                "gimp-eraser",
+                _("Eraser"),
+                "gimp-tool-eraser");
+}
+
+static void
+gimp_eraser_class_init (GimpEraserClass *klass)
+{
+  GimpPaintbrushClass *paintbrush_class = GIMP_PAINTBRUSH_CLASS (klass);
+
+  paintbrush_class->get_color_history_color = gimp_eraser_get_color_history_color;
+  paintbrush_class->get_paint_params        = gimp_eraser_get_paint_params;
+}
+
+static void
+gimp_eraser_init (GimpEraser *eraser)
+{
+}
+
+static gboolean
+gimp_eraser_get_color_history_color (GimpPaintbrush   *paintbrush,
+                                     GimpDrawable     *drawable,
+                                     GimpPaintOptions *paint_options,
+                                     GimpRGB          *color)
+{
+  /* Erasing on a drawable without alpha is equivalent to
+   * drawing with background color. So let's save history.
+   */
+  if (! gimp_drawable_has_alpha (drawable))
+    {
+      GimpContext *context = GIMP_CONTEXT (paint_options);
+
+      gimp_context_get_background (context, color);
+
+      return TRUE;
+    }
+
+  return FALSE;
+}
+
+static void
+gimp_eraser_get_paint_params (GimpPaintbrush            *paintbrush,
+                              GimpDrawable              *drawable,
+                              GimpPaintOptions          *paint_options,
+                              GimpSymmetry              *sym,
+                              gdouble                    grad_point,
+                              GimpLayerMode             *paint_mode,
+                              GimpPaintApplicationMode  *paint_appl_mode,
+                              const GimpTempBuf        **paint_pixmap,
+                              GimpRGB                   *paint_color)
+{
+  GimpEraserOptions *options = GIMP_ERASER_OPTIONS (paint_options);
+  GimpContext       *context = GIMP_CONTEXT (paint_options);
+
+  gimp_context_get_background (context, paint_color);
+  gimp_pickable_srgb_to_image_color (GIMP_PICKABLE (drawable),
+                                     paint_color, paint_color);
+
+  if (options->anti_erase)
+    *paint_mode = GIMP_LAYER_MODE_ANTI_ERASE;
+  else if (gimp_drawable_has_alpha (drawable))
+    *paint_mode = GIMP_LAYER_MODE_ERASE;
+  else
+    *paint_mode = GIMP_LAYER_MODE_NORMAL_LEGACY;
+}