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-rw-r--r--app/core/gimpchannel-combine.c471
1 files changed, 471 insertions, 0 deletions
diff --git a/app/core/gimpchannel-combine.c b/app/core/gimpchannel-combine.c
new file mode 100644
index 0000000..8326f65
--- /dev/null
+++ b/app/core/gimpchannel-combine.c
@@ -0,0 +1,471 @@
+/* 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 <string.h>
+
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#include <gegl.h>
+
+#include "libgimpbase/gimpbase.h"
+#include "libgimpmath/gimpmath.h"
+
+#include "core-types.h"
+
+#include "gegl/gimp-gegl-mask-combine.h"
+
+#include "gimpchannel.h"
+#include "gimpchannel-combine.h"
+
+
+typedef struct
+{
+ GeglRectangle rect;
+
+ gboolean bounds_known;
+ gboolean empty;
+ GeglRectangle bounds;
+} GimpChannelCombineData;
+
+
+/* local function prototypes */
+
+static void gimp_channel_combine_clear (GimpChannel *mask,
+ const GeglRectangle *rect);
+static void gimp_channel_combine_clear_complement (GimpChannel *mask,
+ const GeglRectangle *rect);
+
+static gboolean gimp_channel_combine_start (GimpChannel *mask,
+ GimpChannelOps op,
+ const GeglRectangle *rect,
+ gboolean full_extent,
+ gboolean full_value,
+ GimpChannelCombineData *data);
+static void gimp_channel_combine_end (GimpChannel *mask,
+ GimpChannelCombineData *data);
+
+
+/* private functions */
+
+static void
+gimp_channel_combine_clear (GimpChannel *mask,
+ const GeglRectangle *rect)
+{
+ GeglBuffer *buffer;
+ GeglRectangle area;
+ GeglRectangle update_area;
+
+ if (mask->bounds_known && mask->empty)
+ return;
+
+ buffer = gimp_drawable_get_buffer (GIMP_DRAWABLE (mask));
+
+ if (rect)
+ {
+ if (rect->width <= 0 || rect->height <= 0)
+ return;
+
+ if (mask->bounds_known)
+ {
+ if (! gegl_rectangle_intersect (&area,
+ GEGL_RECTANGLE (mask->x1,
+ mask->y1,
+ mask->x2 - mask->x1,
+ mask->y2 - mask->y1),
+ rect))
+ {
+ return;
+ }
+ }
+ else
+ {
+ area = *rect;
+ }
+
+ update_area = area;
+ }
+ else
+ {
+ if (mask->bounds_known)
+ {
+ area.x = mask->x1;
+ area.y = mask->y1;
+ area.width = mask->x2 - mask->x1;
+ area.height = mask->y2 - mask->y1;
+ }
+ else
+ {
+ area.x = 0;
+ area.y = 0;
+ area.width = gimp_item_get_width (GIMP_ITEM (mask));
+ area.height = gimp_item_get_height (GIMP_ITEM (mask));
+ }
+
+ update_area = area;
+
+ gegl_rectangle_align_to_buffer (&area, &area, buffer,
+ GEGL_RECTANGLE_ALIGNMENT_SUPERSET);
+ }
+
+ gegl_buffer_clear (buffer, &area);
+
+ gimp_drawable_update (GIMP_DRAWABLE (mask),
+ update_area.x, update_area.y,
+ update_area.width, update_area.height);
+}
+
+static void
+gimp_channel_combine_clear_complement (GimpChannel *mask,
+ const GeglRectangle *rect)
+{
+ gint width = gimp_item_get_width (GIMP_ITEM (mask));
+ gint height = gimp_item_get_height (GIMP_ITEM (mask));
+
+ gimp_channel_combine_clear (
+ mask,
+ GEGL_RECTANGLE (0,
+ 0,
+ width,
+ rect->y));
+
+ gimp_channel_combine_clear (
+ mask,
+ GEGL_RECTANGLE (0,
+ rect->y + rect->height,
+ width,
+ height - (rect->y + rect->height)));
+
+ gimp_channel_combine_clear (
+ mask,
+ GEGL_RECTANGLE (0,
+ rect->y,
+ rect->x,
+ rect->height));
+
+ gimp_channel_combine_clear (
+ mask,
+ GEGL_RECTANGLE (rect->x + rect->width,
+ rect->y,
+ width - (rect->x + rect->width),
+ rect->height));
+}
+
+static gboolean
+gimp_channel_combine_start (GimpChannel *mask,
+ GimpChannelOps op,
+ const GeglRectangle *rect,
+ gboolean full_extent,
+ gboolean full_value,
+ GimpChannelCombineData *data)
+{
+ GeglBuffer *buffer = gimp_drawable_get_buffer (GIMP_DRAWABLE (mask));
+ GeglRectangle extent;
+ gboolean intersects;
+
+ extent.x = 0;
+ extent.y = 0;
+ extent.width = gimp_item_get_width (GIMP_ITEM (mask));
+ extent.height = gimp_item_get_height (GIMP_ITEM (mask));
+
+ intersects = gegl_rectangle_intersect (&data->rect, rect, &extent);
+
+ data->bounds_known = mask->bounds_known;
+ data->empty = mask->empty;
+
+ data->bounds.x = mask->x1;
+ data->bounds.y = mask->y1;
+ data->bounds.width = mask->x2 - mask->x1;
+ data->bounds.height = mask->y2 - mask->y1;
+
+ gegl_buffer_freeze_changed (buffer);
+
+ /* Determine new boundary */
+ switch (op)
+ {
+ case GIMP_CHANNEL_OP_REPLACE:
+ gimp_channel_combine_clear (mask, NULL);
+
+ if (! intersects)
+ {
+ data->bounds_known = TRUE;
+ data->empty = TRUE;
+
+ return FALSE;
+ }
+
+ data->bounds_known = FALSE;
+
+ if (full_extent)
+ {
+ data->bounds_known = TRUE;
+ data->empty = FALSE;
+ data->bounds = data->rect;
+ }
+ break;
+
+ case GIMP_CHANNEL_OP_ADD:
+ if (! intersects)
+ return FALSE;
+
+ data->bounds_known = FALSE;
+
+ if (full_extent && (mask->bounds_known ||
+ gegl_rectangle_equal (&data->rect, &extent)))
+ {
+ data->bounds_known = TRUE;
+ data->empty = FALSE;
+
+ if (mask->bounds_known && ! mask->empty)
+ {
+ gegl_rectangle_bounding_box (&data->bounds,
+ &data->bounds, &data->rect);
+ }
+ else
+ {
+ data->bounds = data->rect;
+ }
+ }
+ break;
+
+ case GIMP_CHANNEL_OP_SUBTRACT:
+ if (intersects && mask->bounds_known)
+ {
+ if (mask->empty)
+ {
+ intersects = FALSE;
+ }
+ else
+ {
+ intersects = gegl_rectangle_intersect (&data->rect,
+ &data->rect,
+ &data->bounds);
+ }
+ }
+
+ if (! intersects)
+ return FALSE;
+
+ if (full_value &&
+ gegl_rectangle_contains (&data->rect,
+ mask->bounds_known ? &data->bounds :
+ &extent))
+ {
+ gimp_channel_combine_clear (mask, NULL);
+
+ data->bounds_known = TRUE;
+ data->empty = TRUE;
+
+ return FALSE;
+ }
+
+ data->bounds_known = FALSE;
+
+ gegl_buffer_set_abyss (buffer, &data->rect);
+ break;
+
+ case GIMP_CHANNEL_OP_INTERSECT:
+ if (intersects && mask->bounds_known)
+ {
+ if (mask->empty)
+ {
+ intersects = FALSE;
+ }
+ else
+ {
+ intersects = gegl_rectangle_intersect (&data->rect,
+ &data->rect,
+ &data->bounds);
+ }
+ }
+
+ if (! intersects)
+ {
+ gimp_channel_combine_clear (mask, NULL);
+
+ data->bounds_known = TRUE;
+ data->empty = TRUE;
+
+ return FALSE;
+ }
+
+ if (full_value && mask->bounds_known &&
+ gegl_rectangle_contains (&data->rect, &data->bounds))
+ {
+ return FALSE;
+ }
+
+ data->bounds_known = FALSE;
+
+ gimp_channel_combine_clear_complement (mask, &data->rect);
+
+ gegl_buffer_set_abyss (buffer, &data->rect);
+ break;
+ }
+
+ return TRUE;
+}
+
+static void
+gimp_channel_combine_end (GimpChannel *mask,
+ GimpChannelCombineData *data)
+{
+ GeglBuffer *buffer = gimp_drawable_get_buffer (GIMP_DRAWABLE (mask));
+
+ gegl_buffer_set_abyss (buffer, gegl_buffer_get_extent (buffer));
+
+ gegl_buffer_thaw_changed (buffer);
+
+ mask->bounds_known = data->bounds_known;
+
+ if (data->bounds_known)
+ {
+ mask->empty = data->empty;
+
+ if (data->empty)
+ {
+ mask->x1 = 0;
+ mask->y1 = 0;
+ mask->x2 = gimp_item_get_width (GIMP_ITEM (mask));
+ mask->y2 = gimp_item_get_height (GIMP_ITEM (mask));
+ }
+ else
+ {
+ mask->x1 = data->bounds.x;
+ mask->y1 = data->bounds.y;
+ mask->x2 = data->bounds.x + data->bounds.width;
+ mask->y2 = data->bounds.y + data->bounds.height;
+ }
+ }
+
+ gimp_drawable_update (GIMP_DRAWABLE (mask),
+ data->rect.x, data->rect.y,
+ data->rect.width, data->rect.height);
+}
+
+
+/* public functions */
+
+void
+gimp_channel_combine_rect (GimpChannel *mask,
+ GimpChannelOps op,
+ gint x,
+ gint y,
+ gint w,
+ gint h)
+{
+ GimpChannelCombineData data;
+
+ g_return_if_fail (GIMP_IS_CHANNEL (mask));
+
+ if (gimp_channel_combine_start (mask, op, GEGL_RECTANGLE (x, y, w, h),
+ TRUE, TRUE, &data))
+ {
+ GeglBuffer *buffer = gimp_drawable_get_buffer (GIMP_DRAWABLE (mask));
+
+ gimp_gegl_mask_combine_rect (buffer, op, x, y, w, h);
+ }
+
+ gimp_channel_combine_end (mask, &data);
+}
+
+void
+gimp_channel_combine_ellipse (GimpChannel *mask,
+ GimpChannelOps op,
+ gint x,
+ gint y,
+ gint w,
+ gint h,
+ gboolean antialias)
+{
+ gimp_channel_combine_ellipse_rect (mask, op, x, y, w, h,
+ w / 2.0, h / 2.0, antialias);
+}
+
+void
+gimp_channel_combine_ellipse_rect (GimpChannel *mask,
+ GimpChannelOps op,
+ gint x,
+ gint y,
+ gint w,
+ gint h,
+ gdouble rx,
+ gdouble ry,
+ gboolean antialias)
+{
+ GimpChannelCombineData data;
+
+ g_return_if_fail (GIMP_IS_CHANNEL (mask));
+
+ if (gimp_channel_combine_start (mask, op, GEGL_RECTANGLE (x, y, w, h),
+ TRUE, FALSE, &data))
+ {
+ GeglBuffer *buffer = gimp_drawable_get_buffer (GIMP_DRAWABLE (mask));
+
+ gimp_gegl_mask_combine_ellipse_rect (buffer, op, x, y, w, h,
+ rx, ry, antialias);
+ }
+
+ gimp_channel_combine_end (mask, &data);
+}
+
+void
+gimp_channel_combine_mask (GimpChannel *mask,
+ GimpChannel *add_on,
+ GimpChannelOps op,
+ gint off_x,
+ gint off_y)
+{
+ GeglBuffer *add_on_buffer;
+
+ g_return_if_fail (GIMP_IS_CHANNEL (mask));
+ g_return_if_fail (GIMP_IS_CHANNEL (add_on));
+
+ add_on_buffer = gimp_drawable_get_buffer (GIMP_DRAWABLE (add_on));
+
+ gimp_channel_combine_buffer (mask, add_on_buffer,
+ op, off_x, off_y);
+}
+
+void
+gimp_channel_combine_buffer (GimpChannel *mask,
+ GeglBuffer *add_on_buffer,
+ GimpChannelOps op,
+ gint off_x,
+ gint off_y)
+{
+ GimpChannelCombineData data;
+
+ g_return_if_fail (GIMP_IS_CHANNEL (mask));
+ g_return_if_fail (GEGL_IS_BUFFER (add_on_buffer));
+
+ if (gimp_channel_combine_start (mask, op,
+ GEGL_RECTANGLE (
+ off_x + gegl_buffer_get_x (add_on_buffer),
+ off_y + gegl_buffer_get_y (add_on_buffer),
+ gegl_buffer_get_width (add_on_buffer),
+ gegl_buffer_get_height (add_on_buffer)),
+ FALSE, FALSE, &data))
+ {
+ GeglBuffer *buffer = gimp_drawable_get_buffer (GIMP_DRAWABLE (mask));
+
+ gimp_gegl_mask_combine_buffer (buffer, add_on_buffer, op,
+ off_x, off_y);
+ }
+
+ gimp_channel_combine_end (mask, &data);
+}
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