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-rw-r--r--app/display/gimpcanvastransformguides.c683
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diff --git a/app/display/gimpcanvastransformguides.c b/app/display/gimpcanvastransformguides.c
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+++ b/app/display/gimpcanvastransformguides.c
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+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpcanvastransformguides.c
+ * Copyright (C) 2011 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-transform-utils.h"
+#include "core/gimp-utils.h"
+
+#include "gimpcanvastransformguides.h"
+#include "gimpdisplayshell.h"
+
+
+#define SQRT5 2.236067977
+
+
+enum
+{
+ PROP_0,
+ PROP_TRANSFORM,
+ PROP_X1,
+ PROP_Y1,
+ PROP_X2,
+ PROP_Y2,
+ PROP_TYPE,
+ PROP_N_GUIDES,
+ PROP_CLIP
+};
+
+
+typedef struct _GimpCanvasTransformGuidesPrivate GimpCanvasTransformGuidesPrivate;
+
+struct _GimpCanvasTransformGuidesPrivate
+{
+ GimpMatrix3 transform;
+ gdouble x1, y1;
+ gdouble x2, y2;
+ GimpGuidesType type;
+ gint n_guides;
+ gboolean clip;
+};
+
+#define GET_PRIVATE(transform) \
+ ((GimpCanvasTransformGuidesPrivate *) gimp_canvas_transform_guides_get_instance_private ((GimpCanvasTransformGuides *) (transform)))
+
+
+/* local function prototypes */
+
+static void gimp_canvas_transform_guides_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec);
+static void gimp_canvas_transform_guides_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec);
+static void gimp_canvas_transform_guides_draw (GimpCanvasItem *item,
+ cairo_t *cr);
+static cairo_region_t * gimp_canvas_transform_guides_get_extents (GimpCanvasItem *item);
+
+
+G_DEFINE_TYPE_WITH_PRIVATE (GimpCanvasTransformGuides,
+ gimp_canvas_transform_guides, GIMP_TYPE_CANVAS_ITEM)
+
+#define parent_class gimp_canvas_transform_guides_parent_class
+
+
+static void
+gimp_canvas_transform_guides_class_init (GimpCanvasTransformGuidesClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+ GimpCanvasItemClass *item_class = GIMP_CANVAS_ITEM_CLASS (klass);
+
+ object_class->set_property = gimp_canvas_transform_guides_set_property;
+ object_class->get_property = gimp_canvas_transform_guides_get_property;
+
+ item_class->draw = gimp_canvas_transform_guides_draw;
+ item_class->get_extents = gimp_canvas_transform_guides_get_extents;
+
+ g_object_class_install_property (object_class, PROP_TRANSFORM,
+ gimp_param_spec_matrix3 ("transform",
+ NULL, NULL,
+ NULL,
+ GIMP_PARAM_READWRITE));
+
+ g_object_class_install_property (object_class, PROP_X1,
+ g_param_spec_double ("x1",
+ NULL, NULL,
+ -GIMP_MAX_IMAGE_SIZE,
+ GIMP_MAX_IMAGE_SIZE,
+ 0.0,
+ GIMP_PARAM_READWRITE));
+
+ g_object_class_install_property (object_class, PROP_Y1,
+ g_param_spec_double ("y1",
+ NULL, NULL,
+ -GIMP_MAX_IMAGE_SIZE,
+ GIMP_MAX_IMAGE_SIZE,
+ 0.0,
+ GIMP_PARAM_READWRITE));
+
+ g_object_class_install_property (object_class, PROP_X2,
+ g_param_spec_double ("x2",
+ NULL, NULL,
+ -GIMP_MAX_IMAGE_SIZE,
+ GIMP_MAX_IMAGE_SIZE,
+ 0.0,
+ GIMP_PARAM_READWRITE));
+
+ g_object_class_install_property (object_class, PROP_Y2,
+ g_param_spec_double ("y2",
+ NULL, NULL,
+ -GIMP_MAX_IMAGE_SIZE,
+ GIMP_MAX_IMAGE_SIZE,
+ 0.0,
+ GIMP_PARAM_READWRITE));
+
+ g_object_class_install_property (object_class, PROP_TYPE,
+ g_param_spec_enum ("type", NULL, NULL,
+ GIMP_TYPE_GUIDES_TYPE,
+ GIMP_GUIDES_NONE,
+ GIMP_PARAM_READWRITE));
+
+ g_object_class_install_property (object_class, PROP_N_GUIDES,
+ g_param_spec_int ("n-guides", NULL, NULL,
+ 1, 128, 4,
+ GIMP_PARAM_READWRITE));
+
+ g_object_class_install_property (object_class, PROP_CLIP,
+ g_param_spec_boolean ("clip", NULL, NULL,
+ FALSE,
+ GIMP_PARAM_READWRITE));
+}
+
+static void
+gimp_canvas_transform_guides_init (GimpCanvasTransformGuides *transform)
+{
+}
+
+static void
+gimp_canvas_transform_guides_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ GimpCanvasTransformGuidesPrivate *private = GET_PRIVATE (object);
+
+ switch (property_id)
+ {
+ case PROP_TRANSFORM:
+ {
+ GimpMatrix3 *transform = g_value_get_boxed (value);
+
+ if (transform)
+ private->transform = *transform;
+ else
+ gimp_matrix3_identity (&private->transform);
+ }
+ break;
+
+ case PROP_X1:
+ private->x1 = g_value_get_double (value);
+ break;
+
+ case PROP_Y1:
+ private->y1 = g_value_get_double (value);
+ break;
+
+ case PROP_X2:
+ private->x2 = g_value_get_double (value);
+ break;
+
+ case PROP_Y2:
+ private->y2 = g_value_get_double (value);
+ break;
+
+ case PROP_TYPE:
+ private->type = g_value_get_enum (value);
+ break;
+
+ case PROP_N_GUIDES:
+ private->n_guides = g_value_get_int (value);
+ break;
+
+ case PROP_CLIP:
+ private->clip = g_value_get_boolean (value);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_canvas_transform_guides_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ GimpCanvasTransformGuidesPrivate *private = GET_PRIVATE (object);
+
+ switch (property_id)
+ {
+ case PROP_TRANSFORM:
+ g_value_set_boxed (value, &private->transform);
+ break;
+
+ case PROP_X1:
+ g_value_set_double (value, private->x1);
+ break;
+
+ case PROP_Y1:
+ g_value_set_double (value, private->y1);
+ break;
+
+ case PROP_X2:
+ g_value_set_double (value, private->x2);
+ break;
+
+ case PROP_Y2:
+ g_value_set_double (value, private->y2);
+ break;
+
+ case PROP_TYPE:
+ g_value_set_enum (value, private->type);
+ break;
+
+ case PROP_N_GUIDES:
+ g_value_set_int (value, private->n_guides);
+ break;
+
+ case PROP_CLIP:
+ g_value_set_boolean (value, private->clip);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static gboolean
+gimp_canvas_transform_guides_transform (GimpCanvasItem *item,
+ GimpVector2 *t_vertices,
+ gint *n_t_vertices)
+{
+ GimpCanvasTransformGuidesPrivate *private = GET_PRIVATE (item);
+ GimpVector2 vertices[4];
+
+ vertices[0] = (GimpVector2) { private->x1, private->y1 };
+ vertices[1] = (GimpVector2) { private->x2, private->y1 };
+ vertices[2] = (GimpVector2) { private->x2, private->y2 };
+ vertices[3] = (GimpVector2) { private->x1, private->y2 };
+
+ if (private->clip)
+ {
+ gimp_transform_polygon (&private->transform, vertices, 4, TRUE,
+ t_vertices, n_t_vertices);
+
+ return TRUE;
+ }
+ else
+ {
+ gint i;
+
+ for (i = 0; i < 4; i++)
+ {
+ gimp_matrix3_transform_point (&private->transform,
+ vertices[i].x, vertices[i].y,
+ &t_vertices[i].x, &t_vertices[i].y);
+ }
+
+ *n_t_vertices = 4;
+
+ return gimp_transform_polygon_is_convex (t_vertices[0].x, t_vertices[0].y,
+ t_vertices[1].x, t_vertices[1].y,
+ t_vertices[3].x, t_vertices[3].y,
+ t_vertices[2].x, t_vertices[2].y);
+ }
+}
+
+static void
+draw_line (cairo_t *cr,
+ GimpCanvasItem *item,
+ GimpMatrix3 *transform,
+ gdouble x1,
+ gdouble y1,
+ gdouble x2,
+ gdouble y2)
+{
+ GimpCanvasTransformGuidesPrivate *private = GET_PRIVATE (item);
+ GimpVector2 vertices[2];
+ GimpVector2 t_vertices[2];
+ gint n_t_vertices;
+
+ vertices[0] = (GimpVector2) { x1, y1 };
+ vertices[1] = (GimpVector2) { x2, y2 };
+
+ if (private->clip)
+ {
+ gimp_transform_polygon (transform, vertices, 2, FALSE,
+ t_vertices, &n_t_vertices);
+ }
+ else
+ {
+ gint i;
+
+ for (i = 0; i < 2; i++)
+ {
+ gimp_matrix3_transform_point (transform,
+ vertices[i].x, vertices[i].y,
+ &t_vertices[i].x, &t_vertices[i].y);
+ }
+
+ n_t_vertices = 2;
+ }
+
+ if (n_t_vertices == 2)
+ {
+ gint i;
+
+ for (i = 0; i < 2; i++)
+ {
+ GimpVector2 v;
+
+ gimp_canvas_item_transform_xy_f (item,
+ t_vertices[i].x, t_vertices[i].y,
+ &v.x, &v.y);
+
+ v.x = floor (v.x) + 0.5;
+ v.y = floor (v.y) + 0.5;
+
+ if (i == 0)
+ cairo_move_to (cr, v.x, v.y);
+ else
+ cairo_line_to (cr, v.x, v.y);
+ }
+ }
+}
+
+static void
+draw_hline (cairo_t *cr,
+ GimpCanvasItem *item,
+ GimpMatrix3 *transform,
+ gdouble x1,
+ gdouble x2,
+ gdouble y)
+{
+ draw_line (cr, item, transform, x1, y, x2, y);
+}
+
+static void
+draw_vline (cairo_t *cr,
+ GimpCanvasItem *item,
+ GimpMatrix3 *transform,
+ gdouble y1,
+ gdouble y2,
+ gdouble x)
+{
+ draw_line (cr, item, transform, x, y1, x, y2);
+}
+
+static void
+gimp_canvas_transform_guides_draw (GimpCanvasItem *item,
+ cairo_t *cr)
+{
+ GimpCanvasTransformGuidesPrivate *private = GET_PRIVATE (item);
+ GimpVector2 t_vertices[5];
+ gint n_t_vertices;
+ gboolean convex;
+ gint i;
+
+ convex = gimp_canvas_transform_guides_transform (item,
+ t_vertices, &n_t_vertices);
+
+ if (n_t_vertices < 2)
+ return;
+
+ for (i = 0; i < n_t_vertices; i++)
+ {
+ GimpVector2 v;
+
+ gimp_canvas_item_transform_xy_f (item, t_vertices[i].x, t_vertices[i].y,
+ &v.x, &v.y);
+
+ v.x = floor (v.x) + 0.5;
+ v.y = floor (v.y) + 0.5;
+
+ if (i == 0)
+ cairo_move_to (cr, v.x, v.y);
+ else
+ cairo_line_to (cr, v.x, v.y);
+ }
+
+ cairo_close_path (cr);
+
+ if (! convex || n_t_vertices < 3)
+ {
+ _gimp_canvas_item_stroke (item, cr);
+ return;
+ }
+
+ switch (private->type)
+ {
+ case GIMP_GUIDES_NONE:
+ break;
+
+ case GIMP_GUIDES_CENTER_LINES:
+ draw_hline (cr, item, &private->transform,
+ private->x1, private->x2, (private->y1 + private->y2) / 2);
+ draw_vline (cr, item, &private->transform,
+ private->y1, private->y2, (private->x1 + private->x2) / 2);
+ break;
+
+ case GIMP_GUIDES_THIRDS:
+ draw_hline (cr, item, &private->transform,
+ private->x1, private->x2, (2 * private->y1 + private->y2) / 3);
+ draw_hline (cr, item, &private->transform,
+ private->x1, private->x2, (private->y1 + 2 * private->y2) / 3);
+
+ draw_vline (cr, item, &private->transform,
+ private->y1, private->y2, (2 * private->x1 + private->x2) / 3);
+ draw_vline (cr, item, &private->transform,
+ private->y1, private->y2, (private->x1 + 2 * private->x2) / 3);
+ break;
+
+ case GIMP_GUIDES_FIFTHS:
+ for (i = 0; i < 5; i++)
+ {
+ draw_hline (cr, item, &private->transform,
+ private->x1, private->x2,
+ private->y1 + i * (private->y2 - private->y1) / 5);
+ draw_vline (cr, item, &private->transform,
+ private->y1, private->y2,
+ private->x1 + i * (private->x2 - private->x1) / 5);
+ }
+ break;
+
+ case GIMP_GUIDES_GOLDEN:
+ draw_hline (cr, item, &private->transform,
+ private->x1, private->x2,
+ (2 * private->y1 + (1 + SQRT5) * private->y2) / (3 + SQRT5));
+ draw_hline (cr, item, &private->transform,
+ private->x1, private->x2,
+ ((1 + SQRT5) * private->y1 + 2 * private->y2) / (3 + SQRT5));
+
+ draw_vline (cr, item, &private->transform,
+ private->y1, private->y2,
+ (2 * private->x1 + (1 + SQRT5) * private->x2) / (3 + SQRT5));
+ draw_vline (cr, item, &private->transform,
+ private->y1, private->y2,
+ ((1 + SQRT5) * private->x1 + 2 * private->x2) / (3 + SQRT5));
+ break;
+
+ /* This code implements the method of diagonals discovered by
+ * Edwin Westhoff - see http://www.diagonalmethod.info/
+ */
+ case GIMP_GUIDES_DIAGONALS:
+ {
+ /* the side of the largest square that can be
+ * fitted in whole into the rectangle (x1, y1), (x2, y2)
+ */
+ const gdouble square_side = MIN (private->x2 - private->x1,
+ private->y2 - private->y1);
+
+ /* diagonal from the top-left edge */
+ draw_line (cr, item, &private->transform,
+ private->x1, private->y1,
+ private->x1 + square_side,
+ private->y1 + square_side);
+
+ /* diagonal from the top-right edge */
+ draw_line (cr, item, &private->transform,
+ private->x2, private->y1,
+ private->x2 - square_side,
+ private->y1 + square_side);
+
+ /* diagonal from the bottom-left edge */
+ draw_line (cr, item, &private->transform,
+ private->x1, private->y2,
+ private->x1 + square_side,
+ private->y2 - square_side);
+
+ /* diagonal from the bottom-right edge */
+ draw_line (cr, item, &private->transform,
+ private->x2, private->y2,
+ private->x2 - square_side,
+ private->y2 - square_side);
+ }
+ break;
+
+ case GIMP_GUIDES_N_LINES:
+ case GIMP_GUIDES_SPACING:
+ {
+ gint width, height;
+ gint ngx, ngy;
+
+ width = MAX (1, private->x2 - private->x1);
+ height = MAX (1, private->y2 - private->y1);
+
+ /* the MIN() in the code below limits the grid to one line
+ * every 5 image pixels, see bug 772667.
+ */
+
+ if (private->type == GIMP_GUIDES_N_LINES)
+ {
+ if (width <= height)
+ {
+ ngx = private->n_guides;
+ ngx = MIN (ngx, width / 5);
+
+ ngy = ngx * MAX (1, height / width);
+ ngy = MIN (ngy, height / 5);
+ }
+ else
+ {
+ ngy = private->n_guides;
+ ngy = MIN (ngy, height / 5);
+
+ ngx = ngy * MAX (1, width / height);
+ ngx = MIN (ngx, width / 5);
+ }
+ }
+ else /* GIMP_GUIDES_SPACING */
+ {
+ gint grid_size = MAX (2, private->n_guides);
+
+ ngx = width / grid_size;
+ ngx = MIN (ngx, width / 5);
+
+ ngy = height / grid_size;
+ ngy = MIN (ngy, height / 5);
+ }
+
+ for (i = 1; i <= ngx; i++)
+ {
+ gdouble x = private->x1 + (((gdouble) i) / (ngx + 1) *
+ (private->x2 - private->x1));
+
+ draw_line (cr, item, &private->transform,
+ x, private->y1,
+ x, private->y2);
+ }
+
+ for (i = 1; i <= ngy; i++)
+ {
+ gdouble y = private->y1 + (((gdouble) i) / (ngy + 1) *
+ (private->y2 - private->y1));
+
+ draw_line (cr, item, &private->transform,
+ private->x1, y,
+ private->x2, y);
+ }
+ }
+ }
+
+ _gimp_canvas_item_stroke (item, cr);
+}
+
+static cairo_region_t *
+gimp_canvas_transform_guides_get_extents (GimpCanvasItem *item)
+{
+ GimpVector2 t_vertices[5];
+ gint n_t_vertices;
+ GimpVector2 top_left;
+ GimpVector2 bottom_right;
+ cairo_rectangle_int_t extents;
+ gint i;
+
+ gimp_canvas_transform_guides_transform (item, t_vertices, &n_t_vertices);
+
+ if (n_t_vertices < 2)
+ return cairo_region_create ();
+
+ for (i = 0; i < n_t_vertices; i++)
+ {
+ GimpVector2 v;
+
+ gimp_canvas_item_transform_xy_f (item,
+ t_vertices[i].x, t_vertices[i].y,
+ &v.x, &v.y);
+
+ if (i == 0)
+ {
+ top_left = bottom_right = v;
+ }
+ else
+ {
+ top_left.x = MIN (top_left.x, v.x);
+ top_left.y = MIN (top_left.y, v.y);
+
+ bottom_right.x = MAX (bottom_right.x, v.x);
+ bottom_right.y = MAX (bottom_right.y, v.y);
+ }
+ }
+
+ extents.x = (gint) floor (top_left.x - 1.5);
+ extents.y = (gint) floor (top_left.y - 1.5);
+ extents.width = (gint) ceil (bottom_right.x + 1.5) - extents.x;
+ extents.height = (gint) ceil (bottom_right.y + 1.5) - extents.y;
+
+ return cairo_region_create_rectangle (&extents);
+}
+
+GimpCanvasItem *
+gimp_canvas_transform_guides_new (GimpDisplayShell *shell,
+ const GimpMatrix3 *transform,
+ gdouble x1,
+ gdouble y1,
+ gdouble x2,
+ gdouble y2,
+ GimpGuidesType type,
+ gint n_guides,
+ gboolean clip)
+{
+ g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), NULL);
+
+ return g_object_new (GIMP_TYPE_CANVAS_TRANSFORM_GUIDES,
+ "shell", shell,
+ "transform", transform,
+ "x1", x1,
+ "y1", y1,
+ "x2", x2,
+ "y2", y2,
+ "type", type,
+ "n-guides", n_guides,
+ "clip", clip,
+ NULL);
+}
+
+void
+gimp_canvas_transform_guides_set (GimpCanvasItem *guides,
+ const GimpMatrix3 *transform,
+ gdouble x1,
+ gdouble y1,
+ gdouble x2,
+ gdouble y2,
+ GimpGuidesType type,
+ gint n_guides,
+ gboolean clip)
+{
+ g_return_if_fail (GIMP_IS_CANVAS_TRANSFORM_GUIDES (guides));
+
+ gimp_canvas_item_begin_change (guides);
+
+ g_object_set (guides,
+ "transform", transform,
+ "x1", x1,
+ "y1", y1,
+ "x2", x2,
+ "y2", y2,
+ "type", type,
+ "n-guides", n_guides,
+ "clip", clip,
+ NULL);
+
+ gimp_canvas_item_end_change (guides);
+}
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