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gimp/app/display/gimpcanvastransformpreview.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpcanvastransformpreview.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 <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <string.h>
#include <gegl.h>
#include <gtk/gtk.h>
#include "libgimpbase/gimpbase.h"
#include "libgimpmath/gimpmath.h"
#include "libgimpcolor/gimpcolor.h"
#include "libgimpwidgets/gimpwidgets.h"
#include "display/display-types.h"
#include "core/gimpchannel.h"
#include "core/gimpimage.h"
#include "core/gimp-transform-utils.h"
#include "core/gimp-utils.h"
#include "gegl/gimp-gegl-nodes.h"
#include "gimpcanvas.h"
#include "gimpcanvastransformpreview.h"
#include "gimpdisplayshell.h"
enum
{
PROP_0,
PROP_DRAWABLE,
PROP_TRANSFORM,
PROP_X1,
PROP_Y1,
PROP_X2,
PROP_Y2,
PROP_OPACITY
};
typedef struct _GimpCanvasTransformPreviewPrivate GimpCanvasTransformPreviewPrivate;
struct _GimpCanvasTransformPreviewPrivate
{
GimpDrawable *drawable;
GimpMatrix3 transform;
gdouble x1, y1;
gdouble x2, y2;
gdouble opacity;
GeglNode *node;
GeglNode *source_node;
GeglNode *convert_format_node;
GeglNode *mask_source_node;
GeglNode *opacity_node;
GeglNode *cache_node;
GeglNode *transform_node;
GimpDrawable *node_drawable;
GimpDrawable *node_mask;
gdouble node_opacity;
GimpMatrix3 node_matrix;
};
#define GET_PRIVATE(transform_preview) \
G_TYPE_INSTANCE_GET_PRIVATE (transform_preview, \
GIMP_TYPE_CANVAS_TRANSFORM_PREVIEW, \
GimpCanvasTransformPreviewPrivate)
/* local function prototypes */
static void gimp_canvas_transform_preview_dispose (GObject *object);
static void gimp_canvas_transform_preview_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void gimp_canvas_transform_preview_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void gimp_canvas_transform_preview_draw (GimpCanvasItem *item,
cairo_t *cr);
static cairo_region_t * gimp_canvas_transform_preview_get_extents (GimpCanvasItem *item);
static void gimp_canvas_transform_preview_sync_node (GimpCanvasItem *item);
G_DEFINE_TYPE (GimpCanvasTransformPreview, gimp_canvas_transform_preview,
GIMP_TYPE_CANVAS_ITEM)
#define parent_class gimp_canvas_transform_preview_parent_class
/* private functions */
static void
gimp_canvas_transform_preview_class_init (GimpCanvasTransformPreviewClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GimpCanvasItemClass *item_class = GIMP_CANVAS_ITEM_CLASS (klass);
object_class->dispose = gimp_canvas_transform_preview_dispose;
object_class->set_property = gimp_canvas_transform_preview_set_property;
object_class->get_property = gimp_canvas_transform_preview_get_property;
item_class->draw = gimp_canvas_transform_preview_draw;
item_class->get_extents = gimp_canvas_transform_preview_get_extents;
g_object_class_install_property (object_class, PROP_DRAWABLE,
g_param_spec_object ("drawable",
NULL, NULL,
GIMP_TYPE_DRAWABLE,
GIMP_PARAM_READWRITE));
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_OPACITY,
g_param_spec_double ("opacity",
NULL, NULL,
0.0, 1.0, 1.0,
GIMP_PARAM_READWRITE));
g_type_class_add_private (klass, sizeof (GimpCanvasTransformPreviewPrivate));
}
static void
gimp_canvas_transform_preview_init (GimpCanvasTransformPreview *transform_preview)
{
}
static void
gimp_canvas_transform_preview_dispose (GObject *object)
{
GimpCanvasTransformPreviewPrivate *private = GET_PRIVATE (object);
g_clear_object (&private->node);
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gimp_canvas_transform_preview_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GimpCanvasTransformPreviewPrivate *private = GET_PRIVATE (object);
switch (property_id)
{
case PROP_DRAWABLE:
private->drawable = g_value_get_object (value); /* don't ref */
break;
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_OPACITY:
private->opacity = g_value_get_double (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_canvas_transform_preview_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GimpCanvasTransformPreviewPrivate *private = GET_PRIVATE (object);
switch (property_id)
{
case PROP_DRAWABLE:
g_value_set_object (value, private->drawable);
break;
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_OPACITY:
g_value_set_double (value, private->opacity);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static gboolean
gimp_canvas_transform_preview_transform (GimpCanvasItem *item,
cairo_rectangle_int_t *extents)
{
GimpCanvasTransformPreviewPrivate *private = GET_PRIVATE (item);
gdouble tx1, ty1;
gdouble tx2, ty2;
gdouble tx3, ty3;
gdouble tx4, ty4;
gimp_matrix3_transform_point (&private->transform,
private->x1, private->y1,
&tx1, &ty1);
gimp_matrix3_transform_point (&private->transform,
private->x2, private->y1,
&tx2, &ty2);
gimp_matrix3_transform_point (&private->transform,
private->x1, private->y2,
&tx3, &ty3);
gimp_matrix3_transform_point (&private->transform,
private->x2, private->y2,
&tx4, &ty4);
if (! gimp_transform_polygon_is_convex (tx1, ty1,
tx2, ty2,
tx3, ty3,
tx4, ty4))
return FALSE;
if (extents)
{
gdouble dx1, dy1;
gdouble dx2, dy2;
gdouble dx3, dy3;
gdouble dx4, dy4;
gimp_canvas_item_transform_xy_f (item,
tx1, ty1,
&dx1, &dy1);
gimp_canvas_item_transform_xy_f (item,
tx2, ty2,
&dx2, &dy2);
gimp_canvas_item_transform_xy_f (item,
tx3, ty3,
&dx3, &dy3);
gimp_canvas_item_transform_xy_f (item,
tx4, ty4,
&dx4, &dy4);
extents->x = (gint) floor (MIN4 (dx1, dx2, dx3, dx4));
extents->y = (gint) floor (MIN4 (dy1, dy2, dy3, dy4));
extents->width = (gint) ceil (MAX4 (dx1, dx2, dx3, dx4));
extents->height = (gint) ceil (MAX4 (dy1, dy2, dy3, dy4));
extents->width -= extents->x;
extents->height -= extents->y;
}
return TRUE;
}
static void
gimp_canvas_transform_preview_draw (GimpCanvasItem *item,
cairo_t *cr)
{
GimpCanvasTransformPreviewPrivate *private = GET_PRIVATE (item);
GimpDisplayShell *shell = gimp_canvas_item_get_shell (item);
cairo_rectangle_int_t extents;
gdouble clip_x1, clip_y1;
gdouble clip_x2, clip_y2;
GeglRectangle bounds;
cairo_surface_t *surface;
guchar *surface_data;
gint surface_stride;
/* only draw convex polygons */
if (! gimp_canvas_transform_preview_transform (item, &extents))
return;
cairo_clip_extents (cr, &clip_x1, &clip_y1, &clip_x2, &clip_y2);
clip_x1 = floor (clip_x1);
clip_y1 = floor (clip_y1);
clip_x2 = ceil (clip_x2);
clip_y2 = ceil (clip_y2);
if (! gegl_rectangle_intersect (&bounds,
GEGL_RECTANGLE (extents.x,
extents.y,
extents.width,
extents.height),
GEGL_RECTANGLE (clip_x1,
clip_y1,
clip_x2 - clip_x1,
clip_y2 - clip_y1)))
{
return;
}
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
bounds.width, bounds.height);
g_return_if_fail (surface != NULL);
surface_data = cairo_image_surface_get_data (surface);
surface_stride = cairo_image_surface_get_stride (surface);
gimp_canvas_transform_preview_sync_node (item);
gegl_node_blit (private->transform_node, 1.0,
GEGL_RECTANGLE (bounds.x + shell->offset_x,
bounds.y + shell->offset_y,
bounds.width,
bounds.height),
babl_format ("cairo-ARGB32"), surface_data, surface_stride,
GEGL_BLIT_CACHE);
cairo_surface_mark_dirty (surface);
cairo_set_source_surface (cr, surface, bounds.x, bounds.y);
cairo_rectangle (cr, bounds.x, bounds.y, bounds.width, bounds.height);
cairo_fill (cr);
cairo_surface_destroy (surface);
}
static cairo_region_t *
gimp_canvas_transform_preview_get_extents (GimpCanvasItem *item)
{
cairo_rectangle_int_t rectangle;
if (gimp_canvas_transform_preview_transform (item, &rectangle))
return cairo_region_create_rectangle (&rectangle);
return NULL;
}
static void
gimp_canvas_transform_preview_sync_node (GimpCanvasItem *item)
{
GimpCanvasTransformPreviewPrivate *private = GET_PRIVATE (item);
GimpDisplayShell *shell = gimp_canvas_item_get_shell (item);
GimpImage *image = gimp_canvas_item_get_image (item);
gint offset_x, offset_y;
GimpMatrix3 matrix;
gboolean has_mask;
if (! private->node)
{
private->node = gegl_node_new ();
private->source_node =
gegl_node_new_child (private->node,
"operation", "gimp:buffer-source-validate",
NULL);
private->convert_format_node =
gegl_node_new_child (private->node,
"operation", "gegl:convert-format",
NULL);
private->mask_source_node =
gegl_node_new_child (private->node,
"operation", "gimp:buffer-source-validate",
NULL);
private->opacity_node =
gegl_node_new_child (private->node,
"operation", "gegl:opacity",
NULL);
private->cache_node =
gegl_node_new_child (private->node,
"operation", "gegl:cache",
NULL);
private->transform_node =
gegl_node_new_child (private->node,
"operation", "gegl:transform",
"sampler", GIMP_INTERPOLATION_NONE,
NULL);
gegl_node_link_many (private->source_node,
private->convert_format_node,
private->transform_node,
NULL);
private->node_drawable = NULL;
private->node_mask = NULL;
private->node_opacity = 1.0;
gimp_matrix3_identity (&private->node_matrix);
}
gimp_item_get_offset (GIMP_ITEM (private->drawable), &offset_x, &offset_y);
gimp_matrix3_identity (&matrix);
gimp_matrix3_translate (&matrix, offset_x, offset_y);
gimp_matrix3_mult (&private->transform, &matrix);
gimp_matrix3_scale (&matrix, shell->scale_x, shell->scale_y);
has_mask = gimp_item_mask_bounds (GIMP_ITEM (private->drawable),
NULL, NULL, NULL, NULL);
if (private->drawable != private->node_drawable)
{
private->node_drawable = private->drawable;
gegl_node_set (private->source_node,
"buffer", gimp_drawable_get_buffer (private->drawable),
NULL);
gegl_node_set (private->convert_format_node,
"format", gimp_drawable_get_format_with_alpha (private->drawable),
NULL);
}
if ((has_mask || private->opacity != 1.0) !=
(private->node_mask || private->node_opacity != 1.0))
{
if (has_mask || private->opacity != 1.0)
{
gegl_node_disconnect (private->convert_format_node, "input");
gegl_node_link_many (private->source_node,
private->opacity_node,
private->cache_node,
private->transform_node,
NULL);
}
else
{
gegl_node_disconnect (private->opacity_node, "input");
gegl_node_link_many (private->source_node,
private->convert_format_node,
private->transform_node,
NULL);
}
}
if (has_mask)
{
GimpDrawable *mask = GIMP_DRAWABLE (gimp_image_get_mask (image));
if (mask != private->node_mask)
{
private->node_mask = mask;
gegl_node_set (private->mask_source_node,
"buffer", gimp_drawable_get_buffer (mask),
NULL);
gegl_node_connect_to (private->mask_source_node, "output",
private->opacity_node, "aux");
}
}
else if (private->node_mask)
{
private->node_mask = NULL;
gegl_node_disconnect (private->opacity_node, "aux");
}
if (private->opacity != private->node_opacity)
{
private->node_opacity = private->opacity;
gegl_node_set (private->opacity_node,
"value", private->opacity,
NULL);
}
if (memcmp (&matrix, &private->node_matrix, sizeof (matrix)))
{
private->node_matrix = matrix;
gimp_gegl_node_set_matrix (private->transform_node, &matrix);
}
}
/* public functions */
GimpCanvasItem *
gimp_canvas_transform_preview_new (GimpDisplayShell *shell,
GimpDrawable *drawable,
const GimpMatrix3 *transform,
gdouble x1,
gdouble y1,
gdouble x2,
gdouble y2)
{
g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), NULL);
g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), NULL);
g_return_val_if_fail (transform != NULL, NULL);
return g_object_new (GIMP_TYPE_CANVAS_TRANSFORM_PREVIEW,
"shell", shell,
"drawable", drawable,
"transform", transform,
"x1", x1,
"y1", y1,
"x2", x2,
"y2", y2,
NULL);
}
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