mirror of https://github.com/GNOME/gimp.git
472 lines
14 KiB
C
472 lines
14 KiB
C
/* GIMP - The GNU Image Manipulation Program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <string.h>
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#include <gdk-pixbuf/gdk-pixbuf.h>
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#include <gegl.h>
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#include "libgimpbase/gimpbase.h"
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#include "libgimpmath/gimpmath.h"
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#include "core-types.h"
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#include "gegl/gimp-gegl-mask-combine.h"
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#include "gimpchannel.h"
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#include "gimpchannel-combine.h"
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typedef struct
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{
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GeglRectangle rect;
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gboolean bounds_known;
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gboolean empty;
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GeglRectangle bounds;
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} GimpChannelCombineData;
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/* local function prototypes */
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static void gimp_channel_combine_clear (GimpChannel *mask,
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const GeglRectangle *rect);
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static void gimp_channel_combine_clear_complement (GimpChannel *mask,
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const GeglRectangle *rect);
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static gboolean gimp_channel_combine_start (GimpChannel *mask,
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GimpChannelOps op,
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const GeglRectangle *rect,
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gboolean full_extent,
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gboolean full_value,
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GimpChannelCombineData *data);
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static void gimp_channel_combine_end (GimpChannel *mask,
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GimpChannelCombineData *data);
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/* private functions */
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static void
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gimp_channel_combine_clear (GimpChannel *mask,
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const GeglRectangle *rect)
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{
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GeglBuffer *buffer;
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GeglRectangle area;
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GeglRectangle update_area;
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if (mask->bounds_known && mask->empty)
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return;
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buffer = gimp_drawable_get_buffer (GIMP_DRAWABLE (mask));
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if (rect)
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{
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if (rect->width <= 0 || rect->height <= 0)
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return;
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if (mask->bounds_known)
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{
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if (! gegl_rectangle_intersect (&area,
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GEGL_RECTANGLE (mask->x1,
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mask->y1,
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mask->x2 - mask->x1,
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mask->y2 - mask->y1),
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rect))
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{
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return;
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}
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}
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else
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{
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area = *rect;
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}
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update_area = area;
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}
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else
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{
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if (mask->bounds_known)
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{
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area.x = mask->x1;
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area.y = mask->y1;
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area.width = mask->x2 - mask->x1;
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area.height = mask->y2 - mask->y1;
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}
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else
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{
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area.x = 0;
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area.y = 0;
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area.width = gimp_item_get_width (GIMP_ITEM (mask));
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area.height = gimp_item_get_height (GIMP_ITEM (mask));
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}
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update_area = area;
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gegl_rectangle_align_to_buffer (&area, &area, buffer,
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GEGL_RECTANGLE_ALIGNMENT_SUPERSET);
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}
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gegl_buffer_clear (buffer, &area);
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gimp_drawable_update (GIMP_DRAWABLE (mask),
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update_area.x, update_area.y,
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update_area.width, update_area.height);
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}
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static void
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gimp_channel_combine_clear_complement (GimpChannel *mask,
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const GeglRectangle *rect)
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{
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gint width = gimp_item_get_width (GIMP_ITEM (mask));
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gint height = gimp_item_get_height (GIMP_ITEM (mask));
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gimp_channel_combine_clear (
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mask,
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GEGL_RECTANGLE (0,
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0,
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width,
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rect->y));
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gimp_channel_combine_clear (
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mask,
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GEGL_RECTANGLE (0,
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rect->y + rect->height,
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width,
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height - (rect->y + rect->height)));
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gimp_channel_combine_clear (
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mask,
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GEGL_RECTANGLE (0,
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rect->y,
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rect->x,
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rect->height));
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gimp_channel_combine_clear (
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mask,
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GEGL_RECTANGLE (rect->x + rect->width,
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rect->y,
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width - (rect->x + rect->width),
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rect->height));
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}
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static gboolean
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gimp_channel_combine_start (GimpChannel *mask,
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GimpChannelOps op,
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const GeglRectangle *rect,
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gboolean full_extent,
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gboolean full_value,
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GimpChannelCombineData *data)
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{
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GeglBuffer *buffer = gimp_drawable_get_buffer (GIMP_DRAWABLE (mask));
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GeglRectangle extent;
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gboolean intersects;
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extent.x = 0;
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extent.y = 0;
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extent.width = gimp_item_get_width (GIMP_ITEM (mask));
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extent.height = gimp_item_get_height (GIMP_ITEM (mask));
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intersects = gegl_rectangle_intersect (&data->rect, rect, &extent);
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data->bounds_known = mask->bounds_known;
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data->empty = mask->empty;
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data->bounds.x = mask->x1;
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data->bounds.y = mask->y1;
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data->bounds.width = mask->x2 - mask->x1;
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data->bounds.height = mask->y2 - mask->y1;
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gegl_buffer_freeze_changed (buffer);
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/* Determine new boundary */
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switch (op)
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{
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case GIMP_CHANNEL_OP_REPLACE:
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gimp_channel_combine_clear (mask, NULL);
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if (! intersects)
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{
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data->bounds_known = TRUE;
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data->empty = TRUE;
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return FALSE;
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}
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data->bounds_known = FALSE;
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if (full_extent)
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{
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data->bounds_known = TRUE;
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data->empty = FALSE;
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data->bounds = data->rect;
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}
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break;
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case GIMP_CHANNEL_OP_ADD:
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if (! intersects)
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return FALSE;
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data->bounds_known = FALSE;
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if (full_extent && (mask->bounds_known ||
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gegl_rectangle_equal (&data->rect, &extent)))
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{
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data->bounds_known = TRUE;
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data->empty = FALSE;
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if (mask->bounds_known && ! mask->empty)
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{
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gegl_rectangle_bounding_box (&data->bounds,
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&data->bounds, &data->rect);
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}
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else
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{
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data->bounds = data->rect;
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}
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}
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break;
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case GIMP_CHANNEL_OP_SUBTRACT:
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if (intersects && mask->bounds_known)
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{
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if (mask->empty)
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{
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intersects = FALSE;
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}
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else
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{
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intersects = gegl_rectangle_intersect (&data->rect,
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&data->rect,
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&data->bounds);
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}
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}
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if (! intersects)
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return FALSE;
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if (full_value &&
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gegl_rectangle_contains (&data->rect,
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mask->bounds_known ? &data->bounds :
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&extent))
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{
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gimp_channel_combine_clear (mask, NULL);
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data->bounds_known = TRUE;
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data->empty = TRUE;
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return FALSE;
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}
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data->bounds_known = FALSE;
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gegl_buffer_set_abyss (buffer, &data->rect);
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break;
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case GIMP_CHANNEL_OP_INTERSECT:
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if (intersects && mask->bounds_known)
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{
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if (mask->empty)
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{
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intersects = FALSE;
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}
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else
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{
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intersects = gegl_rectangle_intersect (&data->rect,
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&data->rect,
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&data->bounds);
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}
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}
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if (! intersects)
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{
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gimp_channel_combine_clear (mask, NULL);
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data->bounds_known = TRUE;
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data->empty = TRUE;
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return FALSE;
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}
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if (full_value && mask->bounds_known &&
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gegl_rectangle_contains (&data->rect, &data->bounds))
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{
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return FALSE;
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}
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data->bounds_known = FALSE;
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gimp_channel_combine_clear_complement (mask, &data->rect);
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gegl_buffer_set_abyss (buffer, &data->rect);
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break;
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}
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return TRUE;
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}
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static void
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gimp_channel_combine_end (GimpChannel *mask,
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GimpChannelCombineData *data)
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{
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GeglBuffer *buffer = gimp_drawable_get_buffer (GIMP_DRAWABLE (mask));
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gegl_buffer_set_abyss (buffer, gegl_buffer_get_extent (buffer));
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gegl_buffer_thaw_changed (buffer);
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mask->bounds_known = data->bounds_known;
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if (data->bounds_known)
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{
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mask->empty = data->empty;
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if (data->empty)
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{
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mask->x1 = 0;
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mask->y1 = 0;
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mask->x2 = gimp_item_get_width (GIMP_ITEM (mask));
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mask->y2 = gimp_item_get_height (GIMP_ITEM (mask));
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}
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else
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{
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mask->x1 = data->bounds.x;
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mask->y1 = data->bounds.y;
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mask->x2 = data->bounds.x + data->bounds.width;
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mask->y2 = data->bounds.y + data->bounds.height;
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}
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}
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gimp_drawable_update (GIMP_DRAWABLE (mask),
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data->rect.x, data->rect.y,
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data->rect.width, data->rect.height);
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}
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/* public functions */
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void
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gimp_channel_combine_rect (GimpChannel *mask,
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GimpChannelOps op,
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gint x,
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gint y,
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gint w,
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gint h)
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{
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GimpChannelCombineData data;
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g_return_if_fail (GIMP_IS_CHANNEL (mask));
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if (gimp_channel_combine_start (mask, op, GEGL_RECTANGLE (x, y, w, h),
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TRUE, TRUE, &data))
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{
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GeglBuffer *buffer = gimp_drawable_get_buffer (GIMP_DRAWABLE (mask));
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gimp_gegl_mask_combine_rect (buffer, op, x, y, w, h);
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}
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gimp_channel_combine_end (mask, &data);
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}
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void
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gimp_channel_combine_ellipse (GimpChannel *mask,
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GimpChannelOps op,
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gint x,
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gint y,
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gint w,
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gint h,
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gboolean antialias)
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{
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gimp_channel_combine_ellipse_rect (mask, op, x, y, w, h,
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w / 2.0, h / 2.0, antialias);
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}
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void
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gimp_channel_combine_ellipse_rect (GimpChannel *mask,
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GimpChannelOps op,
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gint x,
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gint y,
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gint w,
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gint h,
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gdouble rx,
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gdouble ry,
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gboolean antialias)
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{
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GimpChannelCombineData data;
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g_return_if_fail (GIMP_IS_CHANNEL (mask));
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if (gimp_channel_combine_start (mask, op, GEGL_RECTANGLE (x, y, w, h),
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TRUE, FALSE, &data))
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{
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GeglBuffer *buffer = gimp_drawable_get_buffer (GIMP_DRAWABLE (mask));
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gimp_gegl_mask_combine_ellipse_rect (buffer, op, x, y, w, h,
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rx, ry, antialias);
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}
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gimp_channel_combine_end (mask, &data);
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}
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void
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gimp_channel_combine_mask (GimpChannel *mask,
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GimpChannel *add_on,
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GimpChannelOps op,
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gint off_x,
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gint off_y)
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{
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GeglBuffer *add_on_buffer;
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g_return_if_fail (GIMP_IS_CHANNEL (mask));
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g_return_if_fail (GIMP_IS_CHANNEL (add_on));
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add_on_buffer = gimp_drawable_get_buffer (GIMP_DRAWABLE (add_on));
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gimp_channel_combine_buffer (mask, add_on_buffer,
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op, off_x, off_y);
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}
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void
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gimp_channel_combine_buffer (GimpChannel *mask,
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GeglBuffer *add_on_buffer,
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GimpChannelOps op,
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gint off_x,
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gint off_y)
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{
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GimpChannelCombineData data;
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g_return_if_fail (GIMP_IS_CHANNEL (mask));
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g_return_if_fail (GEGL_IS_BUFFER (add_on_buffer));
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if (gimp_channel_combine_start (mask, op,
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GEGL_RECTANGLE (
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off_x + gegl_buffer_get_x (add_on_buffer),
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off_y + gegl_buffer_get_y (add_on_buffer),
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gegl_buffer_get_width (add_on_buffer),
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gegl_buffer_get_height (add_on_buffer)),
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FALSE, FALSE, &data))
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{
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GeglBuffer *buffer = gimp_drawable_get_buffer (GIMP_DRAWABLE (mask));
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gimp_gegl_mask_combine_buffer (buffer, add_on_buffer, op,
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off_x, off_y);
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}
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gimp_channel_combine_end (mask, &data);
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}
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