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-rw-r--r--app/operations/gimpoperationoffset.c497
1 files changed, 497 insertions, 0 deletions
diff --git a/app/operations/gimpoperationoffset.c b/app/operations/gimpoperationoffset.c
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--- /dev/null
+++ b/app/operations/gimpoperationoffset.c
@@ -0,0 +1,497 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationoffset.c
+ * Copyright (C) 2019 Ell
+ *
+ * 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 <cairo.h>
+#include <gegl-plugin.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "operations-types.h"
+
+#include "gegl/gimp-gegl-loops.h"
+#include "gegl/gimp-gegl-utils.h"
+
+#include "core/gimpcontext.h"
+
+#include "gimpoperationoffset.h"
+
+#include "gimp-intl.h"
+
+
+enum
+{
+ PROP_0,
+ PROP_CONTEXT,
+ PROP_TYPE,
+ PROP_X,
+ PROP_Y
+};
+
+
+static void gimp_operation_offset_dispose (GObject *object);
+static void gimp_operation_offset_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec);
+static void gimp_operation_offset_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec);
+
+static GeglRectangle gimp_operation_offset_get_required_for_output (GeglOperation *operation,
+ const gchar *input_pad,
+ const GeglRectangle *output_roi);
+static GeglRectangle gimp_operation_offset_get_invalidated_by_change (GeglOperation *operation,
+ const gchar *input_pad,
+ const GeglRectangle *input_roi);
+static void gimp_operation_offset_prepare (GeglOperation *operation);
+static gboolean gimp_operation_offset_parent_process (GeglOperation *operation,
+ GeglOperationContext *context,
+ const gchar *output_pad,
+ const GeglRectangle *result,
+ gint level);
+
+static gboolean gimp_operation_offset_process (GeglOperation *operation,
+ GeglBuffer *input,
+ GeglBuffer *output,
+ const GeglRectangle *roi,
+ gint level);
+
+static void gimp_operation_offset_get_offset (GimpOperationOffset *offset,
+ gboolean invert,
+ gint *x,
+ gint *y);
+static void gimp_operation_offset_get_rect (GimpOperationOffset *offset,
+ gboolean invert,
+ const GeglRectangle *roi,
+ GeglRectangle *rect);
+
+
+G_DEFINE_TYPE (GimpOperationOffset, gimp_operation_offset,
+ GEGL_TYPE_OPERATION_FILTER)
+
+#define parent_class gimp_operation_offset_parent_class
+
+
+static void
+gimp_operation_offset_class_init (GimpOperationOffsetClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+ GeglOperationClass *operation_class = GEGL_OPERATION_CLASS (klass);
+ GeglOperationFilterClass *filter_class = GEGL_OPERATION_FILTER_CLASS (klass);
+
+ object_class->dispose = gimp_operation_offset_dispose;
+ object_class->set_property = gimp_operation_offset_set_property;
+ object_class->get_property = gimp_operation_offset_get_property;
+
+ operation_class->get_required_for_output = gimp_operation_offset_get_required_for_output;
+ operation_class->get_invalidated_by_change = gimp_operation_offset_get_invalidated_by_change;
+ operation_class->prepare = gimp_operation_offset_prepare;
+ operation_class->process = gimp_operation_offset_parent_process;
+
+ operation_class->threaded = FALSE;
+ operation_class->cache_policy = GEGL_CACHE_POLICY_NEVER;
+
+ filter_class->process = gimp_operation_offset_process;
+
+ gegl_operation_class_set_keys (operation_class,
+ "name", "gimp:offset",
+ "categories", "transform",
+ "description", _("Shift the pixels, optionally wrapping them at the borders"),
+ NULL);
+
+ g_object_class_install_property (object_class, PROP_CONTEXT,
+ g_param_spec_object ("context",
+ "Context",
+ "A GimpContext",
+ GIMP_TYPE_CONTEXT,
+ G_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_TYPE,
+ g_param_spec_enum ("type",
+ "Type",
+ "Offset type",
+ GIMP_TYPE_OFFSET_TYPE,
+ GIMP_OFFSET_WRAP_AROUND,
+ G_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_X,
+ g_param_spec_int ("x",
+ "X Offset",
+ "X offset",
+ G_MININT, G_MAXINT, 0,
+ G_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_Y,
+ g_param_spec_int ("y",
+ "Y Offset",
+ "Y offset",
+ G_MININT, G_MAXINT, 0,
+ G_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+}
+
+static void
+gimp_operation_offset_init (GimpOperationOffset *self)
+{
+}
+
+static void
+gimp_operation_offset_dispose (GObject *object)
+{
+ GimpOperationOffset *offset = GIMP_OPERATION_OFFSET (object);
+
+ g_clear_object (&offset->context);
+
+ G_OBJECT_CLASS (parent_class)->dispose (object);
+}
+
+static void
+gimp_operation_offset_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ GimpOperationOffset *offset = GIMP_OPERATION_OFFSET (object);
+
+ switch (property_id)
+ {
+ case PROP_CONTEXT:
+ g_value_set_object (value, offset->context);
+ break;
+
+ case PROP_TYPE:
+ g_value_set_enum (value, offset->type);
+ break;
+
+ case PROP_X:
+ g_value_set_int (value, offset->x);
+ break;
+
+ case PROP_Y:
+ g_value_set_int (value, offset->y);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_operation_offset_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ GimpOperationOffset *offset = GIMP_OPERATION_OFFSET (object);
+
+ switch (property_id)
+ {
+ case PROP_CONTEXT:
+ g_set_object (&offset->context, g_value_get_object (value));
+ break;
+
+ case PROP_TYPE:
+ offset->type = g_value_get_enum (value);
+ break;
+
+ case PROP_X:
+ offset->x = g_value_get_int (value);
+ break;
+
+ case PROP_Y:
+ offset->y = g_value_get_int (value);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static GeglRectangle
+gimp_operation_offset_get_required_for_output (GeglOperation *operation,
+ const gchar *input_pad,
+ const GeglRectangle *output_roi)
+{
+ GimpOperationOffset *offset = GIMP_OPERATION_OFFSET (operation);
+ GeglRectangle rect;
+
+ gimp_operation_offset_get_rect (offset, TRUE, output_roi, &rect);
+
+ return rect;
+}
+
+static GeglRectangle
+gimp_operation_offset_get_invalidated_by_change (GeglOperation *operation,
+ const gchar *input_pad,
+ const GeglRectangle *input_roi)
+{
+ GimpOperationOffset *offset = GIMP_OPERATION_OFFSET (operation);
+ GeglRectangle rect;
+
+ gimp_operation_offset_get_rect (offset, FALSE, input_roi, &rect);
+
+ return rect;
+}
+
+static void
+gimp_operation_offset_prepare (GeglOperation *operation)
+{
+ const Babl *format;
+
+ format = gegl_operation_get_source_format (operation, "input");
+
+ if (! format)
+ format = babl_format ("RGBA float");
+
+ gegl_operation_set_format (operation, "input", format);
+ gegl_operation_set_format (operation, "output", format);
+}
+
+static gboolean
+gimp_operation_offset_parent_process (GeglOperation *operation,
+ GeglOperationContext *context,
+ const gchar *output_pad,
+ const GeglRectangle *result,
+ gint level)
+{
+ GimpOperationOffset *offset = GIMP_OPERATION_OFFSET (operation);
+ GObject *input;
+ gint x;
+ gint y;
+
+ input = gegl_operation_context_get_object (context, "input");
+
+ gimp_operation_offset_get_offset (offset, FALSE, &x, &y);
+
+ if (x == 0 && y == 0)
+ {
+ gegl_operation_context_set_object (context, "output", input);
+
+ return TRUE;
+ }
+ else if (offset->type == GIMP_OFFSET_TRANSPARENT ||
+ (offset->type == GIMP_OFFSET_BACKGROUND &&
+ ! offset->context))
+ {
+ GObject *output = NULL;
+
+ if (input)
+ {
+ GeglRectangle bounds;
+ GeglRectangle extent;
+
+ bounds = gegl_operation_get_bounding_box (GEGL_OPERATION (offset));
+
+ extent = *gegl_buffer_get_extent (GEGL_BUFFER (input));
+
+ extent.x += x;
+ extent.y += y;
+
+ if (gegl_rectangle_intersect (&extent, &extent, &bounds))
+ {
+ output = g_object_new (GEGL_TYPE_BUFFER,
+ "source", input,
+ "x", extent.x,
+ "y", extent.y,
+ "width", extent.width,
+ "height", extent.height,
+ "shift-x", -x,
+ "shift-y", -y,
+ NULL);
+
+ if (gegl_object_get_has_forked (input))
+ gegl_object_set_has_forked (output);
+ }
+ }
+
+ gegl_operation_context_take_object (context, "output", output);
+
+ return TRUE;
+ }
+
+ return GEGL_OPERATION_CLASS (parent_class)->process (operation, context,
+ output_pad, result,
+ level);
+}
+
+static gboolean
+gimp_operation_offset_process (GeglOperation *operation,
+ GeglBuffer *input,
+ GeglBuffer *output,
+ const GeglRectangle *roi,
+ gint level)
+{
+ GimpOperationOffset *offset = GIMP_OPERATION_OFFSET (operation);
+ GeglColor *color = NULL;
+ GeglRectangle bounds;
+ gint x;
+ gint y;
+ gint i;
+
+ bounds = gegl_operation_get_bounding_box (GEGL_OPERATION (offset));
+
+ gimp_operation_offset_get_offset (offset, FALSE, &x, &y);
+
+ if (offset->type == GIMP_OFFSET_BACKGROUND && offset->context)
+ {
+ GimpRGB bg;
+
+ gimp_context_get_background (offset->context, &bg);
+
+ color = gimp_gegl_color_new (&bg);
+ }
+
+ for (i = 0; i < 4; i++)
+ {
+ GeglRectangle offset_bounds = bounds;
+ gint offset_x = x;
+ gint offset_y = y;
+
+ if (i & 1)
+ offset_x += x < 0 ? bounds.width : -bounds.width;
+ if (i & 2)
+ offset_y += y < 0 ? bounds.height : -bounds.height;
+
+ offset_bounds.x += offset_x;
+ offset_bounds.y += offset_y;
+
+ if (gegl_rectangle_intersect (&offset_bounds, &offset_bounds, roi))
+ {
+ if (i == 0 || offset->type == GIMP_OFFSET_WRAP_AROUND)
+ {
+ GeglRectangle offset_roi = offset_bounds;
+
+ offset_roi.x -= offset_x;
+ offset_roi.y -= offset_y;
+
+ gimp_gegl_buffer_copy (input, &offset_roi, GEGL_ABYSS_NONE,
+ output, &offset_bounds);
+ }
+ else if (color)
+ {
+ gegl_buffer_set_color (output, &offset_bounds, color);
+ }
+ }
+ }
+
+ g_clear_object (&color);
+
+ return TRUE;
+}
+
+static void
+gimp_operation_offset_get_offset (GimpOperationOffset *offset,
+ gboolean invert,
+ gint *x,
+ gint *y)
+{
+ GeglRectangle bounds;
+
+ bounds = gegl_operation_get_bounding_box (GEGL_OPERATION (offset));
+
+ if (gegl_rectangle_is_empty (&bounds))
+ {
+ *x = 0;
+ *y = 0;
+
+ return;
+ }
+
+ *x = offset->x;
+ *y = offset->y;
+
+ if (invert)
+ {
+ *x = -*x;
+ *y = -*y;
+ }
+
+ if (offset->type == GIMP_OFFSET_WRAP_AROUND)
+ {
+ *x %= bounds.width;
+
+ if (*x < 0)
+ *x += bounds.width;
+
+ *y %= bounds.height;
+
+ if (*y < 0)
+ *y += bounds.height;
+ }
+ else
+ {
+ *x = CLAMP (*x, -bounds.width, +bounds.width);
+ *y = CLAMP (*y, -bounds.height, +bounds.height);
+ }
+}
+
+static void
+gimp_operation_offset_get_rect (GimpOperationOffset *offset,
+ gboolean invert,
+ const GeglRectangle *roi,
+ GeglRectangle *rect)
+{
+ GeglRectangle bounds;
+ gint x;
+ gint y;
+
+ bounds = gegl_operation_get_bounding_box (GEGL_OPERATION (offset));
+
+ if (gegl_rectangle_is_empty (&bounds))
+ {
+ rect->x = 0;
+ rect->y = 0;
+ rect->width = 0;
+ rect->height = 0;
+
+ return;
+ }
+
+ gimp_operation_offset_get_offset (offset, invert, &x, &y);
+
+ *rect = *roi;
+
+ rect->x += x;
+ rect->y += y;
+
+ if (offset->type == GIMP_OFFSET_WRAP_AROUND)
+ {
+ if (rect->x + rect->width > bounds.x + bounds.width)
+ {
+ rect->x = bounds.x;
+ rect->width = bounds.width;
+ }
+
+ if (rect->y + rect->height > bounds.y + bounds.height)
+ {
+ rect->y = bounds.y;
+ rect->height = bounds.height;
+ }
+ }
+
+ gegl_rectangle_intersect (rect, rect, &bounds);
+}
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