343 lines
11 KiB
C
343 lines
11 KiB
C
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/* PIKA - Photo and Image Kooker Application
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* a rebranding of The GNU Image Manipulation Program (created with heckimp)
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* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
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*
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* Original copyright, applying to most contents (license remains unchanged):
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* pikaimage-transform.c
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* Copyright (C) 2019 Ell
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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 <gdk-pixbuf/gdk-pixbuf.h>
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#include <gegl.h>
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#include "libpikamath/pikamath.h"
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#include "core-types.h"
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#include "vectors/pikavectors.h"
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#include "pika.h"
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#include "pika-transform-resize.h"
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#include "pika-transform-utils.h"
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#include "pikachannel.h"
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#include "pikacontext.h"
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#include "pikaguide.h"
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#include "pikaimage.h"
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#include "pikaimage-guides.h"
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#include "pikaimage-sample-points.h"
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#include "pikaimage-transform.h"
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#include "pikaimage-undo.h"
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#include "pikaimage-undo-push.h"
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#include "pikaitem.h"
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#include "pikaobjectqueue.h"
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#include "pikaprogress.h"
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#include "pikasamplepoint.h"
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#define EPSILON 1e-6
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/* local function prototypes */
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static void pika_image_transform_guides (PikaImage *image,
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const PikaMatrix3 *matrix,
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const GeglRectangle *old_bounds);
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static void pika_image_transform_sample_points (PikaImage *image,
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const PikaMatrix3 *matrix,
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const GeglRectangle *old_bounds);
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/* private functions */
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static void
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pika_image_transform_guides (PikaImage *image,
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const PikaMatrix3 *matrix,
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const GeglRectangle *old_bounds)
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{
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GList *iter;
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for (iter = pika_image_get_guides (image); iter;)
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{
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PikaGuide *guide = iter->data;
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PikaOrientationType old_orientation = pika_guide_get_orientation (guide);
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gint old_position = pika_guide_get_position (guide);
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PikaOrientationType new_orientation;
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gint new_position;
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PikaVector2 vertices[2];
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gint n_vertices;
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PikaVector2 diff;
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iter = g_list_next (iter);
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switch (old_orientation)
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{
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case PIKA_ORIENTATION_HORIZONTAL:
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vertices[0].x = old_bounds->x;
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vertices[0].y = old_bounds->y + old_position;
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vertices[1].x = old_bounds->x + old_bounds->width / 2.0;
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vertices[1].y = old_bounds->y + old_position;
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break;
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case PIKA_ORIENTATION_VERTICAL:
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vertices[0].x = old_bounds->x + old_position;
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vertices[0].y = old_bounds->y;
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vertices[1].x = old_bounds->x + old_position;
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vertices[1].y = old_bounds->y + old_bounds->height / 2.0;
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break;
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case PIKA_ORIENTATION_UNKNOWN:
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g_return_if_reached ();
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}
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pika_transform_polygon (matrix,
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vertices, 2, FALSE,
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vertices, &n_vertices);
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if (n_vertices < 2)
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{
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pika_image_remove_guide (image, guide, TRUE);
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continue;
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}
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pika_vector2_sub (&diff, &vertices[1], &vertices[0]);
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if (pika_vector2_length (&diff) <= EPSILON)
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{
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pika_image_remove_guide (image, guide, TRUE);
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continue;
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}
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if (fabs (diff.x) >= fabs (diff.y))
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{
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new_orientation = PIKA_ORIENTATION_HORIZONTAL;
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new_position = SIGNED_ROUND (vertices[1].y);
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if (new_position < 0 || new_position > pika_image_get_height (image))
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{
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pika_image_remove_guide (image, guide, TRUE);
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continue;
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}
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}
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else
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{
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new_orientation = PIKA_ORIENTATION_VERTICAL;
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new_position = SIGNED_ROUND (vertices[1].x);
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if (new_position < 0 || new_position > pika_image_get_width (image))
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{
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pika_image_remove_guide (image, guide, TRUE);
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continue;
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}
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}
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if (new_orientation != old_orientation ||
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new_position != old_position)
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{
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pika_image_undo_push_guide (image, NULL, guide);
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pika_guide_set_orientation (guide, new_orientation);
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pika_guide_set_position (guide, new_position);
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pika_image_guide_moved (image, guide);
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}
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}
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}
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static void
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pika_image_transform_sample_points (PikaImage *image,
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const PikaMatrix3 *matrix,
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const GeglRectangle *old_bounds)
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{
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GList *iter;
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for (iter = pika_image_get_sample_points (image); iter;)
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{
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PikaSamplePoint *sample_point = iter->data;
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gint old_x;
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gint old_y;
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gint new_x;
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gint new_y;
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PikaVector2 vertices[1];
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gint n_vertices;
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iter = g_list_next (iter);
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pika_sample_point_get_position (sample_point, &old_x, &old_y);
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vertices[0].x = old_x;
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vertices[0].y = old_y;
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pika_transform_polygon (matrix,
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vertices, 1, FALSE,
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vertices, &n_vertices);
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if (n_vertices < 1)
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{
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pika_image_remove_sample_point (image, sample_point, TRUE);
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continue;
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}
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new_x = SIGNED_ROUND (vertices[0].x);
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new_y = SIGNED_ROUND (vertices[0].y);
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if (new_x < 0 || new_x >= pika_image_get_width (image) ||
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new_y < 0 || new_y >= pika_image_get_height (image))
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{
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pika_image_remove_sample_point (image, sample_point, TRUE);
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continue;
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}
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if (new_x != old_x || new_y != old_y)
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pika_image_move_sample_point (image, sample_point, new_x, new_y, TRUE);
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}
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}
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/* public functions */
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void
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pika_image_transform (PikaImage *image,
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PikaContext *context,
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const PikaMatrix3 *matrix,
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PikaTransformDirection direction,
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PikaInterpolationType interpolation_type,
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PikaTransformResize clip_result,
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PikaProgress *progress)
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{
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PikaObjectQueue *queue;
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PikaItem *item;
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PikaMatrix3 transform;
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GeglRectangle old_bounds;
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GeglRectangle new_bounds;
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g_return_if_fail (PIKA_IS_IMAGE (image));
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g_return_if_fail (PIKA_IS_CONTEXT (context));
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g_return_if_fail (matrix != NULL);
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g_return_if_fail (progress == NULL || PIKA_IS_PROGRESS (progress));
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pika_set_busy (image->pika);
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old_bounds.x = 0;
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old_bounds.y = 0;
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old_bounds.width = pika_image_get_width (image);
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old_bounds.height = pika_image_get_height (image);
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transform = *matrix;
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if (direction == PIKA_TRANSFORM_BACKWARD)
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pika_matrix3_invert (&transform);
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pika_transform_resize_boundary (&transform, clip_result,
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old_bounds.x,
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old_bounds.y,
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old_bounds.x + old_bounds.width,
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old_bounds.y + old_bounds.height,
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&new_bounds.x,
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&new_bounds.y,
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&new_bounds.width,
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&new_bounds.height);
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new_bounds.width -= new_bounds.x;
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new_bounds.height -= new_bounds.y;
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pika_matrix3_translate (&transform,
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old_bounds.x - new_bounds.x,
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old_bounds.y - new_bounds.y);
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queue = pika_object_queue_new (progress);
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progress = PIKA_PROGRESS (queue);
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pika_object_queue_push_container (queue, pika_image_get_layers (image));
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pika_object_queue_push (queue, pika_image_get_mask (image));
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pika_object_queue_push_container (queue, pika_image_get_channels (image));
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pika_object_queue_push_container (queue, pika_image_get_vectors (image));
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g_object_freeze_notify (G_OBJECT (image));
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pika_image_undo_group_start (image, PIKA_UNDO_GROUP_IMAGE_TRANSFORM, NULL);
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/* Transform all layers, channels (including selection mask), and vectors */
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while ((item = pika_object_queue_pop (queue)))
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{
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PikaTransformResize clip = PIKA_TRANSFORM_RESIZE_ADJUST;
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if (PIKA_IS_CHANNEL (item))
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clip = clip_result;
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pika_item_transform (item,
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context,
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&transform, direction,
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interpolation_type, clip,
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progress);
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if (PIKA_IS_VECTORS (item))
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pika_item_set_size (item, new_bounds.width, new_bounds.height);
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}
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/* Resize the image (if needed) */
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if (! gegl_rectangle_equal (&new_bounds, &old_bounds))
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{
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pika_image_undo_push_image_size (image,
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NULL,
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new_bounds.x,
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new_bounds.y,
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new_bounds.width,
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new_bounds.height);
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g_object_set (image,
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"width", new_bounds.width,
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"height", new_bounds.height,
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NULL);
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}
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/* Transform all Guides */
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pika_image_transform_guides (image, &transform, &old_bounds);
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/* Transform all sample points */
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pika_image_transform_sample_points (image, &transform, &old_bounds);
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pika_image_undo_group_end (image);
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g_object_unref (queue);
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if (! gegl_rectangle_equal (&new_bounds, &old_bounds))
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{
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pika_image_size_changed_detailed (image,
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old_bounds.x - new_bounds.x,
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old_bounds.y - new_bounds.y,
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old_bounds.width,
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old_bounds.height);
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}
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g_object_thaw_notify (G_OBJECT (image));
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pika_unset_busy (image->pika);
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}
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