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Gimp/app/core/gimplinklayer.c
Jehan d593cb3230 app, pdb, po: new GimpRasterizable interface. 
Share the whole rasterize logic of the text, link and vector layer into
an interface. I didn't write it as an abstract parent class, because we
might have more rasterizable items in the future, which may not be
layers (e.g. there were discussions of vector masks).
2025-10-13 15:37:11 +02:00

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* GimpLinkLayer
* Copyright (C) 2019 Jehan
*
* 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 <string.h>
#include <cairo.h>
#include <gegl.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include "libgimpbase/gimpbase.h"
#include "libgimpcolor/gimpcolor.h"
#include "libgimpconfig/gimpconfig.h"
#include "libgimpmath/gimpmath.h"
#include "core-types.h"
#include "gegl/gimp-gegl-loops.h"
#include "gegl/gimp-gegl-utils.h"
#include "gimp.h"
#include "gimpcontext.h"
#include "gimpimage.h"
#include "gimpimage-color-profile.h"
#include "gimpimage-undo.h"
#include "gimpimage-undo-push.h"
#include "gimpitemtree.h"
#include "gimplink.h"
#include "gimplinklayer.h"
#include "gimpobjectqueue.h"
#include "gimpprogress.h"
#include "gimprasterizable.h"
#include "gimp-intl.h"
#define EPSILON 1e-10
enum
{
LINK_LAYER_XCF_NONE = 0,
LINK_LAYER_XCF_DONT_AUTO_RENAME = 1 << 0,
LINK_LAYER_XCF_MODIFIED = 1 << 1
};
enum
{
PROP_0,
PROP_LINK,
PROP_AUTO_RENAME,
PROP_SCALED_ONLY,
N_PROPS
};
struct _GimpLinkLayerPrivate
{
GimpLink *link;
gboolean scaled_only;
gboolean auto_rename;
GimpMatrix3 matrix;
gint offset_x;
gint offset_y;
GimpInterpolationType interpolation;
/* A transient value only useful to know when to drop monitoring after
* a buffer update.
*/
gboolean keep_monitoring;
};
static void gimp_link_layer_rasterizable_iface_init
(GimpRasterizableInterface *iface);
static void gimp_link_layer_finalize (GObject *object);
static void gimp_link_layer_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void gimp_link_layer_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static gint64 gimp_link_layer_get_memsize (GimpObject *object,
gint64 *gui_size);
static GimpItem * gimp_link_layer_duplicate (GimpItem *item,
GType new_type);
static gboolean gimp_link_layer_rename (GimpItem *item,
const gchar *new_name,
const gchar *undo_desc,
GError **error);
static void gimp_link_layer_translate (GimpItem *item,
gdouble offset_x,
gdouble offset_y,
gboolean push_undo);
static void gimp_link_layer_scale (GimpItem *item,
gint new_width,
gint new_height,
gint new_offset_x,
gint new_offset_y,
GimpInterpolationType interpolation_type,
GimpProgress *progress);
static void gimp_link_layer_transform (GimpItem *item,
GimpContext *context,
const GimpMatrix3 *matrix,
GimpTransformDirection direction,
GimpInterpolationType interpolation_type,
GimpTransformResize clip_result,
GimpProgress *progress,
gboolean push_undo);
static void gimp_link_layer_set_buffer (GimpDrawable *drawable,
gboolean push_undo,
const gchar *undo_desc,
GeglBuffer *buffer,
const GeglRectangle *bounds);
static void gimp_link_layer_push_undo (GimpDrawable *drawable,
const gchar *undo_desc,
GeglBuffer *buffer,
gint x,
gint y,
gint width,
gint height);
static void gimp_link_layer_set_rasterized (GimpRasterizable *rasterizable,
gboolean rasterized);
static void gimp_link_layer_convert_type (GimpLayer *layer,
GimpImage *dest_image,
const Babl *new_format,
GimpColorProfile *src_profile,
GimpColorProfile *dest_profile,
GeglDitherMethod layer_dither_type,
GeglDitherMethod mask_dither_type,
gboolean push_undo,
GimpProgress *progress);
static void gimp_link_layer_render_full (GimpLinkLayer *layer);
static gboolean gimp_link_layer_render_link (GimpLinkLayer *layer);
static gboolean
gimp_link_layer_is_scaling_matrix (GimpLinkLayer *layer,
const GimpMatrix3 *matrix,
gint *new_width,
gint *new_height,
gint *new_offset_x,
gint *new_offset_y);
G_DEFINE_TYPE_WITH_CODE (GimpLinkLayer, gimp_link_layer, GIMP_TYPE_LAYER,
G_ADD_PRIVATE (GimpLinkLayer)
G_IMPLEMENT_INTERFACE (GIMP_TYPE_RASTERIZABLE,
gimp_link_layer_rasterizable_iface_init))
#define parent_class gimp_link_layer_parent_class
static GParamSpec *link_layer_props[N_PROPS] = { NULL, };
static void
gimp_link_layer_class_init (GimpLinkLayerClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GimpObjectClass *gimp_object_class = GIMP_OBJECT_CLASS (klass);
GimpViewableClass *viewable_class = GIMP_VIEWABLE_CLASS (klass);
GimpItemClass *item_class = GIMP_ITEM_CLASS (klass);
GimpDrawableClass *drawable_class = GIMP_DRAWABLE_CLASS (klass);
GimpLayerClass *layer_class = GIMP_LAYER_CLASS (klass);
object_class->finalize = gimp_link_layer_finalize;
object_class->get_property = gimp_link_layer_get_property;
object_class->set_property = gimp_link_layer_set_property;
gimp_object_class->get_memsize = gimp_link_layer_get_memsize;
/* TODO: make a custom icon "gimp-link-layer". */
viewable_class->default_icon_name = "emblem-symbolic-link";
viewable_class->default_name = _("Link Layer");
item_class->duplicate = gimp_link_layer_duplicate;
item_class->rename = gimp_link_layer_rename;
item_class->translate = gimp_link_layer_translate;
item_class->scale = gimp_link_layer_scale;
item_class->transform = gimp_link_layer_transform;
item_class->rename_desc = _("Rename Link Layer");
item_class->translate_desc = _("Move Link Layer");
item_class->scale_desc = _("Scale Link Layer");
item_class->resize_desc = _("Resize Link Layer");
item_class->flip_desc = _("Flip Link Layer");
item_class->rotate_desc = _("Rotate Link Layer");
item_class->transform_desc = _("Transform Link Layer");
drawable_class->set_buffer = gimp_link_layer_set_buffer;
drawable_class->push_undo = gimp_link_layer_push_undo;
layer_class->convert_type = gimp_link_layer_convert_type;
link_layer_props[PROP_LINK] = g_param_spec_object ("link",
NULL, NULL,
GIMP_TYPE_LINK,
GIMP_PARAM_READWRITE |
GIMP_PARAM_STATIC_STRINGS);
link_layer_props[PROP_AUTO_RENAME] = g_param_spec_boolean ("auto-rename",
NULL, NULL,
TRUE,
GIMP_PARAM_READWRITE |
GIMP_PARAM_STATIC_STRINGS);
link_layer_props[PROP_SCALED_ONLY] = g_param_spec_boolean ("scaled-only",
NULL, NULL,
FALSE,
GIMP_PARAM_READWRITE |
GIMP_PARAM_STATIC_STRINGS);
g_object_class_install_properties (object_class, N_PROPS, link_layer_props);
}
static void
gimp_link_layer_init (GimpLinkLayer *layer)
{
layer->p = gimp_link_layer_get_instance_private (layer);
layer->p->link = NULL;
gimp_matrix3_identity (&layer->p->matrix);
layer->p->scaled_only = FALSE;
layer->p->auto_rename = FALSE;
layer->p->offset_x = 0;
layer->p->offset_y = 0;
layer->p->interpolation = GIMP_INTERPOLATION_NONE;
layer->p->keep_monitoring = FALSE;
}
static void
gimp_link_layer_rasterizable_iface_init (GimpRasterizableInterface *iface)
{
iface->set_rasterized = gimp_link_layer_set_rasterized;
}
static void
gimp_link_layer_finalize (GObject *object)
{
GimpLinkLayer *layer = GIMP_LINK_LAYER (object);
g_clear_object (&layer->p->link);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gimp_link_layer_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GimpLinkLayer *layer = GIMP_LINK_LAYER (object);
switch (property_id)
{
case PROP_LINK:
g_value_set_object (value, layer->p->link);
break;
case PROP_AUTO_RENAME:
g_value_set_boolean (value, layer->p->auto_rename);
break;
case PROP_SCALED_ONLY:
g_value_set_boolean (value, layer->p->scaled_only);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_link_layer_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GimpLinkLayer *layer = GIMP_LINK_LAYER (object);
switch (property_id)
{
case PROP_LINK:
gimp_link_layer_set_link (layer, g_value_get_object (value), FALSE);
break;
case PROP_AUTO_RENAME:
layer->p->auto_rename = g_value_get_boolean (value);
break;
case PROP_SCALED_ONLY:
layer->p->scaled_only = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static gint64
gimp_link_layer_get_memsize (GimpObject *object,
gint64 *gui_size)
{
GimpLinkLayer *layer = GIMP_LINK_LAYER (object);
gint64 memsize = 0;
memsize += gimp_object_get_memsize (GIMP_OBJECT (layer->p->link),
gui_size);
return memsize + GIMP_OBJECT_CLASS (parent_class)->get_memsize (object,
gui_size);
}
static GimpItem *
gimp_link_layer_duplicate (GimpItem *item,
GType new_type)
{
GimpItem *new_item;
g_return_val_if_fail (g_type_is_a (new_type, GIMP_TYPE_DRAWABLE), NULL);
new_item = GIMP_ITEM_CLASS (parent_class)->duplicate (item, new_type);
if (GIMP_IS_LINK_LAYER (new_item))
{
GimpLinkLayer *layer = GIMP_LINK_LAYER (item);
GimpLinkLayer *new_layer = GIMP_LINK_LAYER (new_item);
GimpLink *link = NULL;
GeglBuffer *buffer;
gint width;
gint height;
if (layer->p->link)
{
link = gimp_link_duplicate (layer->p->link);
gimp_link_layer_set_link (new_layer, link, FALSE);
}
gimp_config_sync (G_OBJECT (layer), G_OBJECT (new_layer), 0);
buffer = gimp_drawable_get_buffer (GIMP_DRAWABLE (layer));
width = gegl_buffer_get_width (buffer);
height = gegl_buffer_get_height (buffer);
if (width != gimp_item_get_width (GIMP_ITEM (new_layer)) ||
height != gimp_item_get_height (GIMP_ITEM (new_layer)))
{
GeglBuffer *new_buffer;
GeglRectangle bounds;
gimp_item_get_offset (GIMP_ITEM (new_layer), &bounds.x, &bounds.y);
bounds.width = 0;
bounds.height = 0;
new_buffer = gegl_buffer_new (GEGL_RECTANGLE (0, 0, width, height),
gimp_drawable_get_format (GIMP_DRAWABLE (new_layer)));
GIMP_DRAWABLE_CLASS (parent_class)->set_buffer (GIMP_DRAWABLE (new_layer),
FALSE, NULL,
new_buffer, &bounds);
g_object_unref (new_buffer);
}
gimp_gegl_buffer_copy (buffer, NULL, GEGL_ABYSS_NONE,
gimp_drawable_get_buffer (GIMP_DRAWABLE (new_layer)), NULL);
new_layer->p->scaled_only = layer->p->scaled_only;
new_layer->p->auto_rename = layer->p->auto_rename;
new_layer->p->matrix = layer->p->matrix;
new_layer->p->offset_x = layer->p->offset_x;
new_layer->p->offset_y = layer->p->offset_y;
new_layer->p->interpolation = layer->p->interpolation;
new_layer->p->keep_monitoring = FALSE;
g_clear_object (&link);
}
return new_item;
}
static gboolean
gimp_link_layer_rename (GimpItem *item,
const gchar *new_name,
const gchar *undo_desc,
GError **error)
{
if (GIMP_ITEM_CLASS (parent_class)->rename (item, new_name, undo_desc, error))
{
g_object_set (item, "auto-rename", FALSE, NULL);
return TRUE;
}
return FALSE;
}
static void
gimp_link_layer_translate (GimpItem *item,
gdouble offset_x,
gdouble offset_y,
gboolean push_undo)
{
GimpLinkLayer *layer = GIMP_LINK_LAYER (item);
if (! gimp_matrix3_is_identity (&layer->p->matrix))
gimp_matrix3_translate (&layer->p->matrix, offset_x, offset_y);
GIMP_ITEM_CLASS (parent_class)->translate (item, offset_x, offset_y, push_undo);
}
static void
gimp_link_layer_scale (GimpItem *item,
gint new_width,
gint new_height,
gint new_offset_x,
gint new_offset_y,
GimpInterpolationType interpolation_type,
GimpProgress *progress)
{
GimpLinkLayer *link_layer = GIMP_LINK_LAYER (item);
GimpLayer *layer = GIMP_LAYER (item);
GimpObjectQueue *queue = NULL;
if (progress && layer->mask)
{
GimpLayerMask *mask;
queue = gimp_object_queue_new (progress);
progress = GIMP_PROGRESS (queue);
/* temporarily set layer->mask to NULL, so that its size won't be counted
* when pushing the layer to the queue.
*/
mask = layer->mask;
layer->mask = NULL;
gimp_object_queue_push (queue, layer);
gimp_object_queue_push (queue, mask);
layer->mask = mask;
}
if (queue)
gimp_object_queue_pop (queue);
if (gimp_link_is_vector (link_layer->p->link) &&
gimp_link_is_monitored (link_layer->p->link) &&
gimp_matrix3_is_identity (&link_layer->p->matrix))
{
/* Non-modified vector images are always recomputed from the
* source file and therefore are always sharp.
*/
gimp_link_set_size (link_layer->p->link, new_width, new_height, FALSE);
gimp_item_set_offset (item, new_offset_x, new_offset_y);
gimp_link_layer_render_link (link_layer);
}
else if (! gimp_matrix3_is_identity (&link_layer->p->matrix))
{
GimpMatrix3 matrix = link_layer->p->matrix;
gdouble x_scale_factor;
gdouble y_scale_factor;
gint offset_x;
gint offset_y;
x_scale_factor = (gdouble) new_width / gimp_item_get_width (item);
y_scale_factor = (gdouble) new_height / gimp_item_get_height (item);
gimp_matrix3_scale (&matrix, x_scale_factor, y_scale_factor);
gimp_link_layer_set_transform (link_layer, &matrix, interpolation_type, TRUE);
/* Unfortunately we can't know the proper translation offset to
* set before we replay the full matrix (the offsets may have been
* changed in previous transformations).
* To avoid re-loading the source image twice though, I don't call
* gimp_link_layer_set_transform() again but directly edit the
* matrix and set the offset.
*/
gimp_item_get_offset (item, &offset_x, &offset_y);
gimp_matrix3_translate (&link_layer->p->matrix,
new_offset_x - offset_x,
new_offset_y - offset_y);
gimp_item_set_offset (item, new_offset_x, new_offset_y);
gimp_drawable_update_all (GIMP_DRAWABLE (layer));
}
else if (gimp_link_is_monitored (link_layer->p->link))
{
GimpMatrix3 matrix = link_layer->p->matrix;
gdouble x_scale_factor;
gdouble y_scale_factor;
gint offset_x;
gint offset_y;
x_scale_factor = (gdouble) new_width / gimp_item_get_width (item);
y_scale_factor = (gdouble) new_height / gimp_item_get_height (item);
gimp_matrix3_scale (&matrix, x_scale_factor, y_scale_factor);
gimp_item_get_offset (item, &offset_x, &offset_y);
gimp_matrix3_translate (&matrix,
new_offset_x - offset_x,
new_offset_y - offset_y);
gimp_link_layer_set_transform (link_layer, &matrix, interpolation_type, TRUE);
}
else
{
GIMP_ITEM_CLASS (parent_class)->scale (GIMP_ITEM (layer),
new_width, new_height,
new_offset_x, new_offset_y,
interpolation_type, progress);
}
if (layer->mask)
{
if (queue)
gimp_object_queue_pop (queue);
gimp_item_scale (GIMP_ITEM (layer->mask),
new_width, new_height,
new_offset_x, new_offset_y,
interpolation_type, progress);
}
g_clear_object (&queue);
}
static void
gimp_link_layer_transform (GimpItem *item,
GimpContext *context,
const GimpMatrix3 *matrix,
GimpTransformDirection direction,
GimpInterpolationType interpolation_type,
GimpTransformResize clip_result,
GimpProgress *progress,
gboolean push_undo)
{
GimpLinkLayer *layer = GIMP_LINK_LAYER (item);
gboolean keep_monitoring;
if (gimp_matrix3_is_identity (matrix))
return;
if (push_undo)
gimp_image_undo_push_link_layer (gimp_item_get_image (GIMP_ITEM (layer)),
_("Transform Link Layer"), layer);
if (gimp_link_is_vector (layer->p->link) &&
gimp_link_is_monitored (layer->p->link) &&
gimp_matrix3_is_identity (&layer->p->matrix))
{
gint new_width;
gint new_height;
gint new_offset_x;
gint new_offset_y;
if (gimp_link_layer_is_scaling_matrix (layer, matrix,
&new_width, &new_height,
&new_offset_x, &new_offset_y))
{
/* Scaling when no other transformation has happened yet is
* special-case for vector links, because we can do even
* better by reloading from source.
*/
gimp_link_layer_scale (item, new_width, new_height,
new_offset_x, new_offset_y,
interpolation_type, progress);
return;
}
}
/* Clipping would produce different results when applied on a single
* step of multiple transformations. So only "adjust" transformations
* are stored non-destructively. Any clip/crop transformation triggers
* a destructive transform.
*
* Note: we could also store non-destructively a single clipped
* transformation, but that would be harder to document and explain.
*/
keep_monitoring = (gimp_link_is_monitored (layer->p->link) &&
clip_result == GIMP_TRANSFORM_RESIZE_ADJUST);
if (keep_monitoring)
{
GimpMatrix3 left = *matrix;
GimpMatrix3 right = layer->p->matrix;
if (direction == GIMP_TRANSFORM_BACKWARD)
gimp_matrix3_invert (&left);
gimp_matrix3_mult (&left, &right);
gimp_link_layer_set_transform (layer, &right, interpolation_type, TRUE);
}
else
{
/* Reset the transformation matrix. */
gimp_matrix3_identity (&layer->p->matrix);
GIMP_ITEM_CLASS (parent_class)->transform (item, context,
matrix, direction,
interpolation_type,
clip_result, progress,
push_undo);
}
}
static void
gimp_link_layer_set_buffer (GimpDrawable *drawable,
gboolean push_undo,
const gchar *undo_desc,
GeglBuffer *buffer,
const GeglRectangle *bounds)
{
GimpLinkLayer *layer = GIMP_LINK_LAYER (drawable);
GimpImage *image = gimp_item_get_image (GIMP_ITEM (layer));
if (push_undo)
{
gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_DRAWABLE_MOD, undo_desc);
gimp_image_undo_push_link_layer (image, NULL, layer);
}
GIMP_DRAWABLE_CLASS (parent_class)->set_buffer (drawable,
FALSE, undo_desc,
buffer,
bounds);
if (push_undo)
{
if (layer->p->link &&
gimp_link_is_monitored (layer->p->link) &&
! layer->p->keep_monitoring)
gimp_link_freeze (layer->p->link);
gimp_image_undo_group_end (image);
}
}
static void
gimp_link_layer_push_undo (GimpDrawable *drawable,
const gchar *undo_desc,
GeglBuffer *buffer,
gint x,
gint y,
gint width,
gint height)
{
GimpLinkLayer *layer = GIMP_LINK_LAYER (drawable);
GimpImage *image = gimp_item_get_image (GIMP_ITEM (layer));
gboolean monitored;
monitored = gimp_link_is_monitored (layer->p->link);
if (monitored)
{
gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_DRAWABLE, undo_desc);
gimp_image_undo_push_link_layer (image, NULL, layer);
gimp_link_freeze (layer->p->link);
}
GIMP_DRAWABLE_CLASS (parent_class)->push_undo (drawable, undo_desc,
buffer,
x, y, width, height);
if (monitored)
{
gimp_image_undo_group_end (image);
}
}
static void
gimp_link_layer_set_rasterized (GimpRasterizable *rasterizable,
gboolean rasterized)
{
GimpLinkLayer *layer = GIMP_LINK_LAYER (rasterizable);
if (rasterized)
{
gimp_link_freeze (layer->p->link);
}
else
{
gimp_link_thaw (layer->p->link);
gimp_matrix3_identity (&layer->p->matrix);
gimp_link_layer_render_link (layer);
}
}
static void
gimp_link_layer_convert_type (GimpLayer *layer,
GimpImage *dest_image,
const Babl *new_format,
GimpColorProfile *src_profile,
GimpColorProfile *dest_profile,
GeglDitherMethod layer_dither_type,
GeglDitherMethod mask_dither_type,
gboolean push_undo,
GimpProgress *progress)
{
GimpLinkLayer *link_layer = GIMP_LINK_LAYER (layer);
GimpImage *image = gimp_item_get_image (GIMP_ITEM (link_layer));
GIMP_LAYER_CLASS (parent_class)->convert_type (layer, dest_image,
new_format,
src_profile,
dest_profile,
layer_dither_type,
mask_dither_type,
push_undo,
progress);
if (link_layer->p->link && gimp_link_is_monitored (link_layer->p->link))
{
if (push_undo)
gimp_image_undo_push_link_layer (image, NULL, link_layer);
gimp_link_layer_render_link (link_layer);
}
}
/* public functions */
/**
* gimp_link_layer_new:
* @image: the #GimpImage the layer should belong to
* @text: a #GimpText object
*
* Creates a new link layer.
*
* Return value: a new #GimpLinkLayer or %NULL in case of a problem
**/
GimpLayer *
gimp_link_layer_new (GimpImage *image,
GimpLink *link)
{
GimpLinkLayer *layer;
g_return_val_if_fail (GIMP_IS_IMAGE (image), NULL);
layer =
GIMP_LINK_LAYER (gimp_drawable_new (GIMP_TYPE_LINK_LAYER,
image, NULL,
0, 0, 1, 1,
gimp_image_get_layer_format (image,
TRUE)));
gimp_layer_set_mode (GIMP_LAYER (layer),
gimp_image_get_default_new_layer_mode (image),
FALSE);
if (! gimp_link_layer_set_link (layer, link, FALSE))
g_clear_object (&layer);
return GIMP_LAYER (layer);
}
GimpLink *
gimp_link_layer_get_link (GimpLinkLayer *layer)
{
g_return_val_if_fail (GIMP_IS_LINK_LAYER (layer), NULL);
return layer->p->link;
}
gboolean
gimp_link_layer_set_link (GimpLinkLayer *layer,
GimpLink *link,
gboolean push_undo)
{
return gimp_link_layer_set_link_with_matrix (layer, link, NULL,
GIMP_INTERPOLATION_NONE,
0, 0, push_undo);
}
gboolean
gimp_link_layer_set_link_with_matrix (GimpLinkLayer *layer,
GimpLink *link,
GimpMatrix3 *matrix,
GimpInterpolationType interpolation_type,
gint offset_x,
gint offset_y,
gboolean push_undo)
{
gboolean rendered = FALSE;
g_return_val_if_fail (GIMP_IS_LINK_LAYER (layer), FALSE);
g_return_val_if_fail (GIMP_IS_LINK (link), FALSE);
if (gimp_item_is_attached (GIMP_ITEM (layer)) && push_undo)
gimp_image_undo_push_link_layer (gimp_item_get_image (GIMP_ITEM (layer)),
_("Set layer link"), layer);
if (layer->p->link)
{
g_signal_handlers_disconnect_by_func (layer->p->link,
G_CALLBACK (gimp_link_layer_render_full),
layer);
}
g_set_object (&layer->p->link, link);
if (link)
{
g_signal_connect_object (link, "changed",
G_CALLBACK (gimp_link_layer_render_full),
layer, G_CONNECT_SWAPPED);
if (gimp_link_is_monitored (link))
{
if (matrix == NULL)
{
gimp_matrix3_identity (&layer->p->matrix);
rendered = gimp_link_layer_render_link (layer);
}
else
{
if (! gimp_matrix3_is_identity (matrix))
{
layer->p->offset_x = offset_x;
layer->p->offset_y = offset_y;
}
rendered = gimp_link_layer_set_transform (layer, matrix, interpolation_type, push_undo);
}
}
}
g_object_notify (G_OBJECT (layer), "link");
gimp_viewable_invalidate_preview (GIMP_VIEWABLE (layer));
return rendered;
}
gboolean
gimp_link_layer_is_monitored (GimpLinkLayer *layer)
{
g_return_val_if_fail (GIMP_IS_LINK_LAYER (layer), FALSE);
return (GIMP_LINK_LAYER (layer)->p->link &&
gimp_link_is_monitored (GIMP_LINK_LAYER (layer)->p->link));
}
gboolean
gimp_link_layer_get_transform (GimpLinkLayer *layer,
GimpMatrix3 *matrix,
gint *offset_x,
gint *offset_y,
GimpInterpolationType *interpolation)
{
g_return_val_if_fail (GIMP_IS_LINK_LAYER (layer), FALSE);
*matrix = layer->p->matrix;
*offset_x = layer->p->offset_x;
*offset_y = layer->p->offset_y;
*interpolation = layer->p->interpolation;
return ! gimp_matrix3_is_identity (matrix);
}
gboolean
gimp_link_layer_set_transform (GimpLinkLayer *layer,
GimpMatrix3 *matrix,
GimpInterpolationType interpolation_type,
gboolean push_undo)
{
Gimp *gimp;
gboolean rendered;
g_return_val_if_fail (GIMP_IS_LINK_LAYER (layer), FALSE);
g_return_val_if_fail (gimp_link_is_monitored (layer->p->link), FALSE);
gimp = (gimp_item_get_image (GIMP_ITEM (layer)))->gimp;
if (gimp_matrix3_is_identity (&layer->p->matrix))
/* First transformation: store the initial offset. */
gimp_item_get_offset (GIMP_ITEM (layer), &layer->p->offset_x, &layer->p->offset_y);
gimp_item_set_offset (GIMP_ITEM (layer), layer->p->offset_x, layer->p->offset_y);
rendered = gimp_link_layer_render_link (layer);
if (! gimp_matrix3_is_identity (matrix))
{
layer->p->keep_monitoring = TRUE;
GIMP_ITEM_CLASS (parent_class)->transform (GIMP_ITEM (layer),
gimp_get_user_context (gimp),
matrix,
GIMP_TRANSFORM_FORWARD,
interpolation_type,
GIMP_TRANSFORM_RESIZE_ADJUST,
NULL, push_undo);
layer->p->keep_monitoring = FALSE;
}
layer->p->matrix = *matrix;
/* Interpolations are used to obtain reasonable quality. Considering
* that doing a single transform will always be better than several
* transforms in a row, it's OK to just drop the interpolation
* algorithm of previous transforms. We just store the last one.
*/
layer->p->interpolation = interpolation_type;
return rendered;
}
gboolean
gimp_item_is_link_layer (GimpItem *item)
{
g_return_val_if_fail (GIMP_IS_ITEM (item), FALSE);
return (GIMP_IS_LINK_LAYER (item) &&
gimp_link_layer_is_monitored (GIMP_LINK_LAYER (item)));
}
void
gimp_link_layer_set_xcf_flags (GimpLinkLayer *layer,
guint32 flags)
{
g_return_if_fail (GIMP_IS_LINK_LAYER (layer));
g_object_set (layer,
"auto-rename", (flags & LINK_LAYER_XCF_DONT_AUTO_RENAME) == 0,
NULL);
if ((flags & LINK_LAYER_XCF_MODIFIED) != 0)
gimp_link_freeze (layer->p->link);
}
guint32
gimp_link_layer_get_xcf_flags (GimpLinkLayer *link_layer)
{
guint flags = 0;
g_return_val_if_fail (GIMP_IS_LINK_LAYER (link_layer), 0);
if (! link_layer->p->auto_rename)
flags |= LINK_LAYER_XCF_DONT_AUTO_RENAME;
if (! gimp_link_is_monitored (link_layer->p->link))
flags |= LINK_LAYER_XCF_MODIFIED;
return flags;
}
/* private functions */
static void
gimp_link_layer_render_full (GimpLinkLayer *layer)
{
gimp_link_layer_render_link (layer);
if (! gimp_matrix3_is_identity (&layer->p->matrix))
{
Gimp *gimp = (gimp_item_get_image (GIMP_ITEM (layer)))->gimp;
gimp_item_set_offset (GIMP_ITEM (layer), layer->p->offset_x, layer->p->offset_y);
layer->p->keep_monitoring = TRUE;
GIMP_ITEM_CLASS (parent_class)->transform (GIMP_ITEM (layer),
gimp_get_user_context (gimp),
&layer->p->matrix,
GIMP_TRANSFORM_FORWARD,
layer->p->interpolation,
GIMP_TRANSFORM_RESIZE_ADJUST,
NULL, FALSE);
layer->p->keep_monitoring = FALSE;
}
}
static gboolean
gimp_link_layer_render_link (GimpLinkLayer *layer)
{
GimpDrawable *drawable;
GimpItem *item;
GimpImage *image;
GeglBuffer *buffer;
gdouble xres;
gdouble yres;
gint width;
gint height;
if (! layer->p->link)
return FALSE;
drawable = GIMP_DRAWABLE (layer);
item = GIMP_ITEM (layer);
image = gimp_item_get_image (item);
gimp_image_get_resolution (image, &xres, &yres);
/* TODO: I could imagine a GimpBusyBox (to be made as GimpProgress) in
* the later list showing layer update.
*/
buffer = gimp_link_get_buffer (layer->p->link);
if (! buffer)
return FALSE;
width = gegl_buffer_get_width (buffer);
height = gegl_buffer_get_height (buffer);
g_object_freeze_notify (G_OBJECT (drawable));
if ((width != gimp_item_get_width (item) ||
height != gimp_item_get_height (item)))
{
GeglBuffer *new_buffer;
GeglRectangle bounds;
gimp_item_get_offset (GIMP_ITEM (drawable),
&bounds.x, &bounds.y);
bounds.width = 0;
bounds.height = 0;
new_buffer = gegl_buffer_new (GEGL_RECTANGLE (0, 0, width, height),
gimp_drawable_get_format (drawable));
GIMP_DRAWABLE_CLASS (parent_class)->set_buffer (drawable,
FALSE, NULL,
new_buffer, &bounds);
g_object_unref (new_buffer);
if (gimp_layer_get_mask (GIMP_LAYER (layer)))
{
GimpLayerMask *mask = gimp_layer_get_mask (GIMP_LAYER (layer));
static GimpContext *unused_eek = NULL;
if (! unused_eek)
unused_eek = gimp_context_new (image->gimp, "eek", NULL);
gimp_item_resize (GIMP_ITEM (mask),
unused_eek, GIMP_FILL_TRANSPARENT,
width, height, 0, 0);
}
}
if (layer->p->auto_rename)
{
GimpItem *item = GIMP_ITEM (layer);
gchar *name = NULL;
if (layer->p->link)
{
name = g_strdup (gimp_object_get_name (layer->p->link));
}
if (! name || ! name[0])
{
g_free (name);
name = g_strdup (_("Link Layer"));
}
if (gimp_item_is_attached (item))
{
gimp_item_tree_rename_item (gimp_item_get_tree (item), item,
name, FALSE, NULL);
g_free (name);
}
else
{
gimp_object_take_name (GIMP_OBJECT (layer), name);
}
}
gimp_gegl_buffer_copy (buffer, NULL, GEGL_ABYSS_NONE,
gimp_drawable_get_buffer (drawable), NULL);
g_object_thaw_notify (G_OBJECT (drawable));
gimp_drawable_update (drawable, 0, 0, width, height);
gimp_image_flush (image);
return (width > 0 && height > 0);
}
static gboolean
gimp_link_layer_is_scaling_matrix (GimpLinkLayer *layer,
const GimpMatrix3 *matrix,
gint *new_width,
gint *new_height,
gint *new_offset_x,
gint *new_offset_y)
{
gboolean is_scaling;
/* Scaling 3x3 matrix on a 2D plane (with optional translation). */
is_scaling = (matrix->coeff[0][0] > 0.0 && matrix->coeff[0][1] == 0.0 &&
matrix->coeff[1][0] < EPSILON && matrix->coeff[1][1] > 0.0 &&
matrix->coeff[2][0] < EPSILON && matrix->coeff[2][1] < EPSILON && matrix->coeff[2][2] == 1.0);
if (is_scaling)
{
gint width;
gint height;
gint offset_x;
gint offset_y;
width = gimp_item_get_width (GIMP_ITEM (layer));
height = gimp_item_get_height (GIMP_ITEM (layer));
gimp_item_get_offset (GIMP_ITEM (layer), &offset_x, &offset_y);
*new_width = (gint) (width * matrix->coeff[0][0]);
*new_height = (gint) (height * matrix->coeff[1][1]);
*new_offset_x = (gint) (offset_x * matrix->coeff[0][0] + matrix->coeff[0][2]);
*new_offset_y = (gint) (offset_y * matrix->coeff[1][1] + matrix->coeff[1][2]);
}
return is_scaling;
}
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