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gimp/plug-ins/common/align-layers.c

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/* align_layers.c
* Author: Shuji Narazaki <narazaki@InetQ.or.jp>
* Version: 0.26
*
* Copyright (C) 1997-1998 Shuji Narazaki <narazaki@InetQ.or.jp>
*
* 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 <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
#define PLUG_IN_PROC "plug-in-align-layers"
#define PLUG_IN_BINARY "align-layers"
#define PLUG_IN_ROLE "gimp-align-layers"
#define SCALE_WIDTH 150
enum
{
H_NONE,
H_COLLECT,
LEFT2RIGHT,
RIGHT2LEFT,
SNAP2HGRID
};
enum
{
H_BASE_LEFT,
H_BASE_CENTER,
H_BASE_RIGHT
};
enum
{
V_NONE,
V_COLLECT,
TOP2BOTTOM,
BOTTOM2TOP,
SNAP2VGRID
};
enum
{
V_BASE_TOP,
V_BASE_CENTER,
V_BASE_BOTTOM
};
typedef struct
{
gint step_x;
gint step_y;
gint base_x;
gint base_y;
} AlignData;
typedef struct _AlignLayers AlignLayers;
typedef struct _AlignLayersClass AlignLayersClass;
struct _AlignLayers
{
GimpPlugIn parent_instance;
};
struct _AlignLayersClass
{
GimpPlugInClass parent_class;
};
#define ALIGN_LAYERS_TYPE (align_layers_get_type ())
#define ALIGN_LAYERS (obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), ALIGN_LAYERS_TYPE, AlignLayers))
GType align_layers_get_type (void) G_GNUC_CONST;
static GList * align_layers_query_procedures (GimpPlugIn *plug_in);
static GimpProcedure * align_layers_create_procedure (GimpPlugIn *plug_in,
const gchar *name);
static GimpValueArray * align_layers_run (GimpProcedure *procedure,
GimpRunMode run_mode,
GimpImage *image,
GimpDrawable *drawable,
const GimpValueArray *args,
gpointer run_data);
/* Main function */
static GimpPDBStatusType align_layers (GimpImage *image);
/* Helpers and internal functions */
static gint align_layers_count_visibles_layers (GList *layers);
static GimpLayer * align_layers_find_last_layer (GList *layers,
gboolean *found);
static gint align_layers_spread_visibles_layers (GList *layers,
GimpLayer **layers_array);
static GimpLayer ** align_layers_spread_image (GimpImage *image,
gint *layer_num);
static GimpLayer * align_layers_find_background (GimpImage *image);
static AlignData align_layers_gather_data (GimpLayer **layers,
gint layer_num,
GimpLayer *background);
static void align_layers_perform_alignment (GimpLayer **layers,
gint layer_num,
AlignData data);
static void align_layers_get_align_offsets (GimpDrawable *drawable,
gint *x,
gint *y);
static gint align_layers_dialog (void);
G_DEFINE_TYPE (AlignLayers, align_layers, GIMP_TYPE_PLUG_IN)
GIMP_MAIN (ALIGN_LAYERS_TYPE)
/* dialog variables */
typedef struct
{
gint h_style;
gint h_base;
gint v_style;
gint v_base;
gboolean ignore_bottom;
gboolean base_is_bottom_layer;
gint grid_size;
} ValueType;
static ValueType VALS =
{
H_NONE,
H_BASE_LEFT,
V_NONE,
V_BASE_TOP,
TRUE,
FALSE,
10
};
static void
align_layers_class_init (AlignLayersClass *klass)
{
GimpPlugInClass *plug_in_class = GIMP_PLUG_IN_CLASS (klass);
plug_in_class->query_procedures = align_layers_query_procedures;
plug_in_class->create_procedure = align_layers_create_procedure;
}
static void
align_layers_init (AlignLayers *film)
{
}
static GList *
align_layers_query_procedures (GimpPlugIn *plug_in)
{
return g_list_append (NULL, g_strdup (PLUG_IN_PROC));
}
static GimpProcedure *
align_layers_create_procedure (GimpPlugIn *plug_in,
const gchar *name)
{
GimpProcedure *procedure = NULL;
if (! strcmp (name, PLUG_IN_PROC))
{
procedure = gimp_image_procedure_new (plug_in, name,
GIMP_PDB_PROC_TYPE_PLUGIN,
align_layers_run, NULL, NULL);
gimp_procedure_set_image_types (procedure, "*");
gimp_procedure_set_menu_label (procedure, N_("Align Visi_ble Layers..."));
gimp_procedure_add_menu_path (procedure, "<Image>/Image/Arrange");
gimp_procedure_set_documentation (procedure,
N_("Align all visible layers of the image"),
"Align visible layers",
name);
gimp_procedure_set_attribution (procedure,
"Shuji Narazaki <narazaki@InetQ.or.jp>",
"Shuji Narazaki",
"1997");
/* TODO: these 2 arguments existed in the original procedure but
* were actually unused. If we want to keep them, let's at least
* implement the documented behavior, or else let's just drop
* them.
*/
/*
GIMP_PROC_ARG_BOOLEAN (procedure,
"link-after-alignment",
"Link the visible layers after alignment",
FALSE,
G_PARAM_READWRITE);
GIMP_PROC_ARG_BOOLEAN (procedure,
"use-bottom",
"use the bottom layer as the base of alignment",
TRUE,
G_PARAM_READWRITE);
*/
}
return procedure;
}
static GimpValueArray *
align_layers_run (GimpProcedure *procedure,
GimpRunMode run_mode,
GimpImage *image,
GimpDrawable *drawable,
const GimpValueArray *args,
gpointer run_data)
{
GimpValueArray *return_vals = NULL;
GimpPDBStatusType status = GIMP_PDB_EXECUTION_ERROR;
GError *error = NULL;
GList *layers;
gint layer_num;
INIT_I18N ();
switch ( run_mode )
{
case GIMP_RUN_INTERACTIVE:
layers = gimp_image_list_layers (image);
layer_num = align_layers_count_visibles_layers (layers);
g_list_free (layers);
if (layer_num < 2)
{
error = g_error_new_literal (0, 0,
_("There are not enough layers to align."));
break;
}
gimp_get_data (PLUG_IN_PROC, &VALS);
VALS.grid_size = MAX (VALS.grid_size, 1);
if (! align_layers_dialog ())
status = GIMP_PDB_CANCEL;
break;
case GIMP_RUN_NONINTERACTIVE:
break;
case GIMP_RUN_WITH_LAST_VALS:
gimp_get_data (PLUG_IN_PROC, &VALS);
break;
}
if (status != GIMP_PDB_CANCEL)
{
status = align_layers (image);
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
}
if (run_mode == GIMP_RUN_INTERACTIVE && status == GIMP_PDB_SUCCESS)
gimp_set_data (PLUG_IN_PROC, &VALS, sizeof (ValueType));
return_vals = gimp_procedure_new_return_values (procedure, status,
error);
return return_vals;
}
/*
* Main function
*/
static GimpPDBStatusType
align_layers (GimpImage *image)
{
gint layer_num = 0;
GimpLayer **layers = NULL;
GimpLayer *background = 0;
AlignData data;
layers = align_layers_spread_image (image, &layer_num);
if (layer_num < 2)
{
g_free (layers);
return GIMP_PDB_EXECUTION_ERROR;
}
background = align_layers_find_background (image);
/* If we want to ignore the bottom layer and if it's visible */
if (VALS.ignore_bottom && background == layers[layer_num - 1])
{
layer_num--;
}
data = align_layers_gather_data (layers,
layer_num,
background);
gimp_image_undo_group_start (image);
align_layers_perform_alignment (layers,
layer_num,
data);
gimp_image_undo_group_end (image);
g_free (layers);
return GIMP_PDB_SUCCESS;
}
/*
* Find the bottommost layer, visible or not
* The image must contain at least one layer.
*/
static GimpLayer *
align_layers_find_last_layer (GList *layers,
gboolean *found)
{
GList *last = g_list_last (layers);
for (; last; last = last->prev)
{
GimpItem *item = last->data;
if (gimp_item_is_group (item))
{
GList *children;
GimpLayer *last_layer;
children = gimp_item_list_children (item);
last_layer = align_layers_find_last_layer (children,
found);
g_list_free (children);
if (*found)
return last_layer;
}
else if (gimp_item_is_layer (item))
{
*found = TRUE;
return GIMP_LAYER (item);
}
}
/* should never happen */
return NULL;
}
/*
* Return the bottom layer.
*/
static GimpLayer *
align_layers_find_background (GimpImage *image)
{
GList *layers;
GimpLayer *background;
gboolean found = FALSE;
layers = gimp_image_list_layers (image);
background = align_layers_find_last_layer (layers, &found);
g_list_free (layers);
return background;
}
/*
* Fill layers_array with all visible layers.
* layers_array needs to be allocated before the call
*/
static gint
align_layers_spread_visibles_layers (GList *layers,
GimpLayer **layers_array)
{
GList *iter;
gint index = 0;
for (iter = layers; iter; iter = iter->next)
{
GimpItem *item = iter->data;
if (gimp_item_get_visible (item))
{
if (gimp_item_is_group (item))
{
GList *children;
children = gimp_item_list_children (item);
index += align_layers_spread_visibles_layers (children,
&(layers_array[index]));
g_list_free (children);
}
else if (gimp_item_is_layer (item))
{
layers_array[index] = GIMP_LAYER (item);
index++;
}
}
}
return index;
}
/*
* Return a contiguous array of all visible layers
*/
static GimpLayer **
align_layers_spread_image (GimpImage *image,
gint *layer_num)
{
GList *layers;
GimpLayer **layers_array;
layers = gimp_image_list_layers (image);
*layer_num = align_layers_count_visibles_layers (layers);
layers_array = g_malloc (sizeof (GimpLayer *) * *layer_num);
align_layers_spread_visibles_layers (layers,
layers_array);
g_list_free (layers);
return layers_array;
}
static gint
align_layers_count_visibles_layers (GList *layers)
{
GList *iter;
gint count = 0;
for (iter = layers; iter; iter = iter->next)
{
GimpItem *item = iter->data;
if (gimp_item_get_visible (item))
{
if (gimp_item_is_group (item))
{
GList *children;
children = gimp_item_list_children (item);
count += align_layers_count_visibles_layers (children);
g_list_free (children);
}
else if (gimp_item_is_layer (item))
{
count += 1;
}
}
}
return count;
}
static AlignData
align_layers_gather_data (GimpLayer **layers,
gint layer_num,
GimpLayer *background)
{
AlignData data;
gint min_x = G_MAXINT;
gint min_y = G_MAXINT;
gint max_x = G_MININT;
gint max_y = G_MININT;
gint index;
gint orig_x = 0;
gint orig_y = 0;
gint offset_x = 0;
gint offset_y = 0;
data.step_x = 0;
data.step_y = 0;
data.base_x = 0;
data.base_y = 0;
/* 0 is the top layer */
for (index = 0; index < layer_num; index++)
{
gimp_drawable_offsets (GIMP_DRAWABLE (layers[index]), &orig_x, &orig_y);
align_layers_get_align_offsets (GIMP_DRAWABLE (layers[index]),
&offset_x,
&offset_y);
orig_x += offset_x;
orig_y += offset_y;
min_x = MIN (min_x, orig_x);
max_x = MAX (max_x, orig_x);
min_y = MIN (min_y, orig_y);
max_y = MAX (max_y, orig_y);
}
if (VALS.base_is_bottom_layer)
{
gimp_drawable_offsets (GIMP_DRAWABLE (background), &orig_x, &orig_y);
align_layers_get_align_offsets (GIMP_DRAWABLE (background),
&offset_x,
&offset_y);
orig_x += offset_x;
orig_y += offset_y;
data.base_x = min_x = orig_x;
data.base_y = min_y = orig_y;
}
if (layer_num > 1)
{
data.step_x = (max_x - min_x) / (layer_num - 1);
data.step_y = (max_y - min_y) / (layer_num - 1);
}
if ( (VALS.h_style == LEFT2RIGHT) || (VALS.h_style == RIGHT2LEFT))
data.base_x = min_x;
if ( (VALS.v_style == TOP2BOTTOM) || (VALS.v_style == BOTTOM2TOP))
data.base_y = min_y;
return data;
}
/*
* Modifies position of each visible layers
* according to data.
*/
static void
align_layers_perform_alignment (GimpLayer **layers,
gint layer_num,
AlignData data)
{
gint index;
for (index = 0; index < layer_num; index++)
{
gint x = 0;
gint y = 0;
gint orig_x;
gint orig_y;
gint offset_x;
gint offset_y;
gimp_drawable_offsets (GIMP_DRAWABLE (layers[index]), &orig_x, &orig_y);
align_layers_get_align_offsets (GIMP_DRAWABLE (layers[index]),
&offset_x,
&offset_y);
switch (VALS.h_style)
{
case H_NONE:
x = orig_x;
break;
case H_COLLECT:
x = data.base_x - offset_x;
break;
case LEFT2RIGHT:
x = (data.base_x + index * data.step_x) - offset_x;
break;
case RIGHT2LEFT:
x = (data.base_x + (layer_num - index - 1) * data.step_x) - offset_x;
break;
case SNAP2HGRID:
x = VALS.grid_size
* (int) ((orig_x + offset_x + VALS.grid_size /2) / VALS.grid_size)
- offset_x;
break;
}
switch (VALS.v_style)
{
case V_NONE:
y = orig_y;
break;
case V_COLLECT:
y = data.base_y - offset_y;
break;
case TOP2BOTTOM:
y = (data.base_y + index * data.step_y) - offset_y;
break;
case BOTTOM2TOP:
y = (data.base_y + (layer_num - index - 1) * data.step_y) - offset_y;
break;
case SNAP2VGRID:
y = VALS.grid_size
* (int) ((orig_y + offset_y + VALS.grid_size / 2) / VALS.grid_size)
- offset_y;
break;
}
gimp_layer_set_offsets (layers[index], x, y);
}
}
static void
align_layers_get_align_offsets (GimpDrawable *drawable,
gint *x,
gint *y)
{
gint width = gimp_drawable_width (drawable);
gint height = gimp_drawable_height (drawable);
switch (VALS.h_base)
{
case H_BASE_LEFT:
*x = 0;
break;
case H_BASE_CENTER:
*x = width / 2;
break;
case H_BASE_RIGHT:
*x = width;
break;
default:
*x = 0;
break;
}
switch (VALS.v_base)
{
case V_BASE_TOP:
*y = 0;
break;
case V_BASE_CENTER:
*y = height / 2;
break;
case V_BASE_BOTTOM:
*y = height;
break;
default:
*y = 0;
break;
}
}
static int
align_layers_dialog (void)
{
GtkWidget *dialog;
GtkWidget *grid;
GtkWidget *combo;
GtkWidget *toggle;
GtkAdjustment *adj;
gboolean run;
gimp_ui_init (PLUG_IN_BINARY);
dialog = gimp_dialog_new (_("Align Visible Layers"), PLUG_IN_ROLE,
NULL, 0,
gimp_standard_help_func, PLUG_IN_PROC,
_("_Cancel"), GTK_RESPONSE_CANCEL,
_("_OK"), GTK_RESPONSE_OK,
NULL);
gimp_dialog_set_alternative_button_order (GTK_DIALOG (dialog),
GTK_RESPONSE_OK,
GTK_RESPONSE_CANCEL,
-1);
gimp_window_set_transient (GTK_WINDOW (dialog));
grid = gtk_grid_new ();
gtk_grid_set_row_spacing (GTK_GRID (grid), 6);
gtk_grid_set_column_spacing (GTK_GRID (grid), 6);
gtk_container_set_border_width (GTK_CONTAINER (grid), 12);
gtk_box_pack_start (GTK_BOX (gtk_dialog_get_content_area (GTK_DIALOG (dialog))),
grid, FALSE, FALSE, 0);
gtk_widget_show (grid);
combo = gimp_int_combo_box_new (C_("align-style", "None"), H_NONE,
_("Collect"), H_COLLECT,
_("Fill (left to right)"), LEFT2RIGHT,
_("Fill (right to left)"), RIGHT2LEFT,
_("Snap to grid"), SNAP2HGRID,
NULL);
gimp_int_combo_box_set_active (GIMP_INT_COMBO_BOX (combo), VALS.h_style);
g_signal_connect (combo, "changed",
G_CALLBACK (gimp_int_combo_box_get_active),
&VALS.h_style);
gimp_grid_attach_aligned (GTK_GRID (grid), 0, 0,
_("_Horizontal style:"), 0.0, 0.5,
combo, 2);
combo = gimp_int_combo_box_new (_("Left edge"), H_BASE_LEFT,
_("Center"), H_BASE_CENTER,
_("Right edge"), H_BASE_RIGHT,
NULL);
gimp_int_combo_box_set_active (GIMP_INT_COMBO_BOX (combo), VALS.h_base);
g_signal_connect (combo, "changed",
G_CALLBACK (gimp_int_combo_box_get_active),
&VALS.h_base);
gimp_grid_attach_aligned (GTK_GRID (grid), 0, 1,
_("Ho_rizontal base:"), 0.0, 0.5,
combo, 2);
combo = gimp_int_combo_box_new (C_("align-style", "None"), V_NONE,
_("Collect"), V_COLLECT,
_("Fill (top to bottom)"), TOP2BOTTOM,
_("Fill (bottom to top)"), BOTTOM2TOP,
_("Snap to grid"), SNAP2VGRID,
NULL);
gimp_int_combo_box_set_active (GIMP_INT_COMBO_BOX (combo), VALS.v_style);
g_signal_connect (combo, "changed",
G_CALLBACK (gimp_int_combo_box_get_active),
&VALS.v_style);
gimp_grid_attach_aligned (GTK_GRID (grid), 0, 2,
_("_Vertical style:"), 0.0, 0.5,
combo, 2);
combo = gimp_int_combo_box_new (_("Top edge"), V_BASE_TOP,
_("Center"), V_BASE_CENTER,
_("Bottom edge"), V_BASE_BOTTOM,
NULL);
gimp_int_combo_box_set_active (GIMP_INT_COMBO_BOX (combo), VALS.v_base);
g_signal_connect (combo, "changed",
G_CALLBACK (gimp_int_combo_box_get_active),
&VALS.v_base);
gimp_grid_attach_aligned (GTK_GRID (grid), 0, 3,
_("Ver_tical base:"), 0.0, 0.5,
combo, 2);
adj = gimp_scale_entry_new (GTK_GRID (grid), 0, 4,
_("_Grid size:"), SCALE_WIDTH, 0,
VALS.grid_size, 1, 200, 1, 10, 0,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_int_adjustment_update),
&VALS.grid_size);
toggle = gtk_check_button_new_with_mnemonic
(_("_Ignore the bottom layer even if visible"));
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), VALS.ignore_bottom);
gtk_grid_attach (GTK_GRID (grid), toggle, 0, 5, 3, 1);
gtk_widget_show (toggle);
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&VALS.ignore_bottom);
toggle = gtk_check_button_new_with_mnemonic
(_("_Use the (invisible) bottom layer as the base"));
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle),
VALS.base_is_bottom_layer);
gtk_grid_attach (GTK_GRID (grid), toggle, 0, 6, 3, 1);
gtk_widget_show (toggle);
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&VALS.base_is_bottom_layer);
gtk_widget_show (dialog);
run = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK);
gtk_widget_destroy (dialog);
return run;
}
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