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Diffstat (limited to '')
-rw-r--r-- | app/display/gimpcanvasboundary.c | 384 |
1 files changed, 384 insertions, 0 deletions
diff --git a/app/display/gimpcanvasboundary.c b/app/display/gimpcanvasboundary.c new file mode 100644 index 0000000..a6cab9d --- /dev/null +++ b/app/display/gimpcanvasboundary.c @@ -0,0 +1,384 @@ +/* GIMP - The GNU Image Manipulation Program + * Copyright (C) 1995 Spencer Kimball and Peter Mattis + * + * gimpcanvasboundary.c + * Copyright (C) 2010 Michael Natterer <mitch@gimp.org> + * + * 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 <gegl.h> +#include <gtk/gtk.h> + +#include "libgimpbase/gimpbase.h" +#include "libgimpmath/gimpmath.h" + +#include "display-types.h" + +#include "core/gimp-cairo.h" +#include "core/gimp-transform-utils.h" +#include "core/gimpboundary.h" +#include "core/gimpparamspecs.h" + +#include "gimpcanvasboundary.h" +#include "gimpdisplayshell.h" + + +enum +{ + PROP_0, + PROP_SEGS, + PROP_TRANSFORM, + PROP_OFFSET_X, + PROP_OFFSET_Y +}; + + +typedef struct _GimpCanvasBoundaryPrivate GimpCanvasBoundaryPrivate; + +struct _GimpCanvasBoundaryPrivate +{ + GimpBoundSeg *segs; + gint n_segs; + GimpMatrix3 *transform; + gdouble offset_x; + gdouble offset_y; +}; + +#define GET_PRIVATE(boundary) \ + ((GimpCanvasBoundaryPrivate *) gimp_canvas_boundary_get_instance_private ((GimpCanvasBoundary *) (boundary))) + + +/* local function prototypes */ + +static void gimp_canvas_boundary_finalize (GObject *object); +static void gimp_canvas_boundary_set_property (GObject *object, + guint property_id, + const GValue *value, + GParamSpec *pspec); +static void gimp_canvas_boundary_get_property (GObject *object, + guint property_id, + GValue *value, + GParamSpec *pspec); +static void gimp_canvas_boundary_draw (GimpCanvasItem *item, + cairo_t *cr); +static cairo_region_t * gimp_canvas_boundary_get_extents (GimpCanvasItem *item); + + +G_DEFINE_TYPE_WITH_PRIVATE (GimpCanvasBoundary, gimp_canvas_boundary, + GIMP_TYPE_CANVAS_ITEM) + +#define parent_class gimp_canvas_boundary_parent_class + + +static void +gimp_canvas_boundary_class_init (GimpCanvasBoundaryClass *klass) +{ + GObjectClass *object_class = G_OBJECT_CLASS (klass); + GimpCanvasItemClass *item_class = GIMP_CANVAS_ITEM_CLASS (klass); + + object_class->finalize = gimp_canvas_boundary_finalize; + object_class->set_property = gimp_canvas_boundary_set_property; + object_class->get_property = gimp_canvas_boundary_get_property; + + item_class->draw = gimp_canvas_boundary_draw; + item_class->get_extents = gimp_canvas_boundary_get_extents; + + g_object_class_install_property (object_class, PROP_SEGS, + gimp_param_spec_array ("segs", NULL, NULL, + GIMP_PARAM_READWRITE)); + + g_object_class_install_property (object_class, PROP_TRANSFORM, + g_param_spec_pointer ("transform", NULL, NULL, + GIMP_PARAM_READWRITE)); + + g_object_class_install_property (object_class, PROP_OFFSET_X, + g_param_spec_double ("offset-x", NULL, NULL, + -GIMP_MAX_IMAGE_SIZE, + GIMP_MAX_IMAGE_SIZE, 0, + GIMP_PARAM_READWRITE)); + + g_object_class_install_property (object_class, PROP_OFFSET_Y, + g_param_spec_double ("offset-y", NULL, NULL, + -GIMP_MAX_IMAGE_SIZE, + GIMP_MAX_IMAGE_SIZE, 0, + GIMP_PARAM_READWRITE)); +} + +static void +gimp_canvas_boundary_init (GimpCanvasBoundary *boundary) +{ + gimp_canvas_item_set_line_cap (GIMP_CANVAS_ITEM (boundary), + CAIRO_LINE_CAP_SQUARE); +} + +static void +gimp_canvas_boundary_finalize (GObject *object) +{ + GimpCanvasBoundaryPrivate *private = GET_PRIVATE (object); + + g_clear_pointer (&private->segs, g_free); + private->n_segs = 0; + + g_clear_pointer (&private->transform, g_free); + + G_OBJECT_CLASS (parent_class)->finalize (object); +} + +static void +gimp_canvas_boundary_set_property (GObject *object, + guint property_id, + const GValue *value, + GParamSpec *pspec) +{ + GimpCanvasBoundaryPrivate *private = GET_PRIVATE (object); + + switch (property_id) + { + case PROP_SEGS: + break; + + case PROP_TRANSFORM: + { + GimpMatrix3 *transform = g_value_get_pointer (value); + if (private->transform) + g_free (private->transform); + if (transform) + private->transform = g_memdup (transform, sizeof (GimpMatrix3)); + else + private->transform = NULL; + } + break; + + case PROP_OFFSET_X: + private->offset_x = g_value_get_double (value); + break; + case PROP_OFFSET_Y: + private->offset_y = g_value_get_double (value); + break; + + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); + break; + } +} + +static void +gimp_canvas_boundary_get_property (GObject *object, + guint property_id, + GValue *value, + GParamSpec *pspec) +{ + GimpCanvasBoundaryPrivate *private = GET_PRIVATE (object); + + switch (property_id) + { + case PROP_SEGS: + break; + + case PROP_TRANSFORM: + g_value_set_pointer (value, private->transform); + break; + + case PROP_OFFSET_X: + g_value_set_double (value, private->offset_x); + break; + case PROP_OFFSET_Y: + g_value_set_double (value, private->offset_y); + break; + + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); + break; + } +} + +static void +gimp_canvas_boundary_transform (GimpCanvasItem *item, + GimpSegment *segs, + gint *n_segs) +{ + GimpCanvasBoundaryPrivate *private = GET_PRIVATE (item); + gint i; + + if (private->transform) + { + gint n = 0; + + for (i = 0; i < private->n_segs; i++) + { + GimpVector2 vertices[2]; + GimpVector2 t_vertices[2]; + gint n_t_vertices; + + vertices[0] = (GimpVector2) { private->segs[i].x1, private->segs[i].y1 }; + vertices[1] = (GimpVector2) { private->segs[i].x2, private->segs[i].y2 }; + + gimp_transform_polygon (private->transform, vertices, 2, FALSE, + t_vertices, &n_t_vertices); + + if (n_t_vertices == 2) + { + gimp_canvas_item_transform_xy (item, + t_vertices[0].x + private->offset_x, + t_vertices[0].y + private->offset_y, + &segs[n].x1, &segs[n].y1); + gimp_canvas_item_transform_xy (item, + t_vertices[1].x + private->offset_x, + t_vertices[1].y + private->offset_y, + &segs[n].x2, &segs[n].y2); + + n++; + } + } + + *n_segs = n; + } + else + { + for (i = 0; i < private->n_segs; i++) + { + gimp_canvas_item_transform_xy (item, + private->segs[i].x1 + private->offset_x, + private->segs[i].y1 + private->offset_y, + &segs[i].x1, + &segs[i].y1); + gimp_canvas_item_transform_xy (item, + private->segs[i].x2 + private->offset_x, + private->segs[i].y2 + private->offset_y, + &segs[i].x2, + &segs[i].y2); + + /* If this segment is a closing segment && the segments lie inside + * the region, OR if this is an opening segment and the segments + * lie outside the region... + * we need to transform it by one display pixel + */ + if (! private->segs[i].open) + { + /* If it is vertical */ + if (segs[i].x1 == segs[i].x2) + { + segs[i].x1 -= 1; + segs[i].x2 -= 1; + } + else + { + segs[i].y1 -= 1; + segs[i].y2 -= 1; + } + } + } + + *n_segs = private->n_segs; + } +} + +static void +gimp_canvas_boundary_draw (GimpCanvasItem *item, + cairo_t *cr) +{ + GimpCanvasBoundaryPrivate *private = GET_PRIVATE (item); + GimpSegment *segs; + gint n_segs; + + segs = g_new0 (GimpSegment, private->n_segs); + + gimp_canvas_boundary_transform (item, segs, &n_segs); + + gimp_cairo_segments (cr, segs, n_segs); + + _gimp_canvas_item_stroke (item, cr); + + g_free (segs); +} + +static cairo_region_t * +gimp_canvas_boundary_get_extents (GimpCanvasItem *item) +{ + GimpCanvasBoundaryPrivate *private = GET_PRIVATE (item); + cairo_rectangle_int_t rectangle; + GimpSegment *segs; + gint n_segs; + gint x1, y1, x2, y2; + gint i; + + segs = g_new0 (GimpSegment, private->n_segs); + + gimp_canvas_boundary_transform (item, segs, &n_segs); + + if (n_segs == 0) + { + g_free (segs); + + return cairo_region_create (); + } + + x1 = MIN (segs[0].x1, segs[0].x2); + y1 = MIN (segs[0].y1, segs[0].y2); + x2 = MAX (segs[0].x1, segs[0].x2); + y2 = MAX (segs[0].y1, segs[0].y2); + + for (i = 1; i < n_segs; i++) + { + gint x3 = MIN (segs[i].x1, segs[i].x2); + gint y3 = MIN (segs[i].y1, segs[i].y2); + gint x4 = MAX (segs[i].x1, segs[i].x2); + gint y4 = MAX (segs[i].y1, segs[i].y2); + + x1 = MIN (x1, x3); + y1 = MIN (y1, y3); + x2 = MAX (x2, x4); + y2 = MAX (y2, y4); + } + + g_free (segs); + + rectangle.x = x1 - 2; + rectangle.y = y1 - 2; + rectangle.width = x2 - x1 + 4; + rectangle.height = y2 - y1 + 4; + + return cairo_region_create_rectangle (&rectangle); +} + +GimpCanvasItem * +gimp_canvas_boundary_new (GimpDisplayShell *shell, + const GimpBoundSeg *segs, + gint n_segs, + GimpMatrix3 *transform, + gdouble offset_x, + gdouble offset_y) +{ + GimpCanvasItem *item; + GimpCanvasBoundaryPrivate *private; + + g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), NULL); + + item = g_object_new (GIMP_TYPE_CANVAS_BOUNDARY, + "shell", shell, + "transform", transform, + "offset-x", offset_x, + "offset-y", offset_y, + NULL); + private = GET_PRIVATE (item); + + /* puke */ + private->segs = g_memdup (segs, n_segs * sizeof (GimpBoundSeg)); + private->n_segs = n_segs; + + return item; +} |