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PIKApp/libpika/pikaexport.c

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Initial checkin of Pika from heckimp
2023-09-26 00:35:21 +02:00
/* LIBPIKA - The PIKA Library
* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
*
* pikaexport.c
* Copyright (C) 1999-2004 Sven Neumann <sven@gimp.org>
*
* This library is free software: you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <string.h>
#include <gtk/gtk.h>
#include "pika.h"
#include "pikaui.h"
#include "libpika-intl.h"
/**
* SECTION: pikaexport
* @title: pikaexport
* @short_description: Export an image before it is saved.
*
* This function should be called by all save_plugins unless they are
* able to save all image formats PIKA knows about. It takes care of
* asking the user if she wishes to export the image to a format the
* save_plugin can handle. It then performs the necessary conversions
* (e.g. Flatten) on a copy of the image so that the image can be
* saved without changing the original image.
*
* The capabilities of the save_plugin are specified by combining
* #PikaExportCapabilities using a bitwise OR.
*
* Make sure you have initialized GTK+ before you call this function
* as it will most probably have to open a dialog.
**/
typedef void (* ExportFunc) (PikaImage *image,
GList **drawables);
/* the export action structure */
typedef struct
{
ExportFunc default_action;
ExportFunc alt_action;
const gchar *reason;
const gchar *possibilities[2];
gint choice;
} ExportAction;
/* the functions that do the actual export */
static void
export_merge (PikaImage *image,
GList **drawables)
{
GList *layers;
GList *iter;
gint32 nvisible = 0;
layers = pika_image_list_layers (image);
for (iter = layers; iter; iter = g_list_next (iter))
{
if (pika_item_get_visible (PIKA_ITEM (iter->data)))
nvisible++;
}
if (nvisible <= 1)
{
PikaLayer *transp;
PikaImageType layer_type;
/* if there is only one (or zero) visible layer, add a new
* transparent layer that has the same size as the canvas. The
* merge that follows will ensure that the offset, opacity and
* size are correct
*/
switch (pika_image_get_base_type (image))
{
case PIKA_RGB:
layer_type = PIKA_RGBA_IMAGE;
break;
case PIKA_GRAY:
layer_type = PIKA_GRAYA_IMAGE;
break;
case PIKA_INDEXED:
layer_type = PIKA_INDEXEDA_IMAGE;
break;
default:
/* In case we add a new type in future. */
g_return_if_reached ();
}
transp = pika_layer_new (image, "-",
pika_image_get_width (image),
pika_image_get_height (image),
layer_type,
100.0, PIKA_LAYER_MODE_NORMAL);
pika_image_insert_layer (image, transp, NULL, 1);
pika_selection_none (image);
pika_drawable_edit_clear (PIKA_DRAWABLE (transp));
nvisible++;
}
if (nvisible > 1)
{
PikaLayer *merged;
merged = pika_image_merge_visible_layers (image, PIKA_CLIP_TO_IMAGE);
g_return_if_fail (merged != NULL);
*drawables = g_list_prepend (NULL, merged);
g_list_free (layers);
layers = pika_image_list_layers (image);
/* make sure that the merged drawable matches the image size */
if (pika_drawable_get_width (PIKA_DRAWABLE (merged)) !=
pika_image_get_width (image) ||
pika_drawable_get_height (PIKA_DRAWABLE (merged)) !=
pika_image_get_height (image))
{
gint off_x, off_y;
pika_drawable_get_offsets (PIKA_DRAWABLE (merged), &off_x, &off_y);
pika_layer_resize (merged,
pika_image_get_width (image),
pika_image_get_height (image),
off_x, off_y);
}
}
/* remove any remaining (invisible) layers */
for (iter = layers; iter; iter = iter->next)
{
if (! g_list_find (*drawables, iter->data))
pika_image_remove_layer (image, iter->data);
}
g_list_free (layers);
}
static void
export_flatten (PikaImage *image,
GList **drawables)
{
PikaLayer *flattened;
flattened = pika_image_flatten (image);
if (flattened != NULL)
*drawables = g_list_prepend (NULL, flattened);
}
static void
export_remove_alpha (PikaImage *image,
GList **drawables)
{
GList *layers;
GList *iter;
layers = pika_image_list_layers (image);
for (iter = layers; iter; iter = iter->next)
{
if (pika_drawable_has_alpha (PIKA_DRAWABLE (iter->data)))
pika_layer_flatten (iter->data);
}
g_list_free (layers);
}
static void
export_apply_masks (PikaImage *image,
GList **drawables)
{
GList *layers;
GList *iter;
layers = pika_image_list_layers (image);
for (iter = layers; iter; iter = iter->next)
{
PikaLayerMask *mask;
mask = pika_layer_get_mask (iter->data);
if (mask)
{
/* we can't apply the mask directly to a layer group, so merge it
* first
*/
if (pika_item_is_group (iter->data))
iter->data = pika_image_merge_layer_group (image, iter->data);
pika_layer_remove_mask (iter->data, PIKA_MASK_APPLY);
}
}
g_list_free (layers);
}
static void
export_convert_rgb (PikaImage *image,
GList **drawables)
{
pika_image_convert_rgb (image);
}
static void
export_convert_grayscale (PikaImage *image,
GList **drawables)
{
pika_image_convert_grayscale (image);
}
static void
export_convert_indexed (PikaImage *image,
GList **drawables)
{
GList *layers;
GList *iter;
gboolean has_alpha = FALSE;
/* check alpha */
layers = pika_image_list_layers (image);
for (iter = *drawables; iter; iter = iter->next)
{
if (pika_drawable_has_alpha (iter->data))
{
has_alpha = TRUE;
break;
}
}
if (layers || has_alpha)
pika_image_convert_indexed (image,
PIKA_CONVERT_DITHER_NONE,
PIKA_CONVERT_PALETTE_GENERATE,
255, FALSE, FALSE, "");
else
pika_image_convert_indexed (image,
PIKA_CONVERT_DITHER_NONE,
PIKA_CONVERT_PALETTE_GENERATE,
256, FALSE, FALSE, "");
g_list_free (layers);
}
static void
export_convert_bitmap (PikaImage *image,
GList **drawables)
{
if (pika_image_get_base_type (image) == PIKA_INDEXED)
pika_image_convert_rgb (image);
pika_image_convert_indexed (image,
PIKA_CONVERT_DITHER_FS,
PIKA_CONVERT_PALETTE_GENERATE,
2, FALSE, FALSE, "");
}
static void
export_add_alpha (PikaImage *image,
GList **drawables)
{
GList *layers;
GList *iter;
layers = pika_image_list_layers (image);
for (iter = layers; iter; iter = iter->next)
{
if (! pika_drawable_has_alpha (PIKA_DRAWABLE (iter->data)))
pika_layer_add_alpha (PIKA_LAYER (iter->data));
}
g_list_free (layers);
}
static void
export_crop_image (PikaImage *image,
GList **drawables)
{
pika_image_crop (image,
pika_image_get_width (image),
pika_image_get_height (image),
0, 0);
}
static void
export_resize_image (PikaImage *image,
GList **drawables)
{
pika_image_resize_to_layers (image);
}
static void
export_void (PikaImage *image,
GList **drawables)
{
/* do nothing */
}
/* a set of predefined actions */
static ExportAction export_action_merge =
{
export_merge,
NULL,
N_("%s plug-in can't handle layers"),
{ N_("Merge Visible Layers"), NULL },
0
};
static ExportAction export_action_merge_single =
{
export_merge,
NULL,
N_("%s plug-in can't handle layer offsets, size or opacity"),
{ N_("Merge Visible Layers"), NULL },
0
};
static ExportAction export_action_animate_or_merge =
{
NULL,
export_merge,
N_("%s plug-in can only handle layers as animation frames"),
{ N_("Save as Animation"), N_("Merge Visible Layers") },
0
};
static ExportAction export_action_animate_or_flatten =
{
NULL,
export_flatten,
N_("%s plug-in can only handle layers as animation frames"),
{ N_("Save as Animation"), N_("Flatten Image") },
0
};
static ExportAction export_action_merge_or_flatten =
{
export_flatten,
export_merge,
N_("%s plug-in can't handle layers"),
{ N_("Flatten Image"), N_("Merge Visible Layers") },
1
};
static ExportAction export_action_flatten =
{
export_flatten,
NULL,
N_("%s plug-in can't handle transparency"),
{ N_("Flatten Image"), NULL },
0
};
static ExportAction export_action_remove_alpha =
{
export_remove_alpha,
NULL,
N_("%s plug-in can't handle transparent layers"),
{ N_("Flatten Image"), NULL },
0
};
static ExportAction export_action_apply_masks =
{
export_apply_masks,
NULL,
N_("%s plug-in can't handle layer masks"),
{ N_("Apply Layer Masks"), NULL },
0
};
static ExportAction export_action_convert_rgb =
{
export_convert_rgb,
NULL,
N_("%s plug-in can only handle RGB images"),
{ N_("Convert to RGB"), NULL },
0
};
static ExportAction export_action_convert_grayscale =
{
export_convert_grayscale,
NULL,
N_("%s plug-in can only handle grayscale images"),
{ N_("Convert to Grayscale"), NULL },
0
};
static ExportAction export_action_convert_indexed =
{
export_convert_indexed,
NULL,
N_("%s plug-in can only handle indexed images"),
{ N_("Convert to Indexed using default settings\n"
"(Do it manually to tune the result)"), NULL },
0
};
static ExportAction export_action_convert_bitmap =
{
export_convert_bitmap,
NULL,
N_("%s plug-in can only handle bitmap (two color) indexed images"),
{ N_("Convert to Indexed using bitmap default settings\n"
"(Do it manually to tune the result)"), NULL },
0
};
static ExportAction export_action_convert_rgb_or_grayscale =
{
export_convert_rgb,
export_convert_grayscale,
N_("%s plug-in can only handle RGB or grayscale images"),
{ N_("Convert to RGB"), N_("Convert to Grayscale")},
0
};
static ExportAction export_action_convert_rgb_or_indexed =
{
export_convert_rgb,
export_convert_indexed,
N_("%s plug-in can only handle RGB or indexed images"),
{ N_("Convert to RGB"), N_("Convert to Indexed using default settings\n"
"(Do it manually to tune the result)")},
0
};
static ExportAction export_action_convert_indexed_or_grayscale =
{
export_convert_indexed,
export_convert_grayscale,
N_("%s plug-in can only handle grayscale or indexed images"),
{ N_("Convert to Indexed using default settings\n"
"(Do it manually to tune the result)"),
N_("Convert to Grayscale") },
0
};
static ExportAction export_action_add_alpha =
{
export_add_alpha,
NULL,
N_("%s plug-in needs an alpha channel"),
{ N_("Add Alpha Channel"), NULL},
0
};
static ExportAction export_action_crop_or_resize =
{
export_crop_image,
export_resize_image,
N_("%s plug-in needs to crop the layers to the image bounds"),
{ N_("Crop Layers"), N_("Resize Image to Layers")},
0
};
static ExportFunc
export_action_get_func (const ExportAction *action)
{
if (action->choice == 0 && action->default_action)
{
return action->default_action;
}
if (action->choice == 1 && action->alt_action)
{
return action->alt_action;
}
return export_void;
}
static void
export_action_perform (const ExportAction *action,
PikaImage *image,
GList **drawables)
{
export_action_get_func (action) (image, drawables);
}
/* dialog functions */
static void
export_toggle_callback (GtkWidget *widget,
gpointer data)
{
gint *choice = (gint *) data;
if (gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (widget)))
*choice = FALSE;
else
*choice = TRUE;
}
static PikaExportReturn
confirm_save_dialog (const gchar *message,
const gchar *format_name)
{
GtkWidget *dialog;
GtkWidget *hbox;
GtkWidget *image;
GtkWidget *main_vbox;
GtkWidget *label;
gchar *text;
PikaExportReturn retval;
g_return_val_if_fail (message != NULL, PIKA_EXPORT_CANCEL);
g_return_val_if_fail (format_name != NULL, PIKA_EXPORT_CANCEL);
dialog = pika_dialog_new (_("Confirm Save"), "pika-export-image-confirm",
NULL, 0,
pika_standard_help_func,
"pika-export-confirm-dialog",
_("_Cancel"), GTK_RESPONSE_CANCEL,
_("C_onfirm"), GTK_RESPONSE_OK,
NULL);
pika_dialog_set_alternative_button_order (GTK_DIALOG (dialog),
GTK_RESPONSE_OK,
GTK_RESPONSE_CANCEL,
-1);
gtk_window_set_resizable (GTK_WINDOW (dialog), FALSE);
pika_window_set_transient (GTK_WINDOW (dialog));
hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 12);
gtk_box_pack_start (GTK_BOX (gtk_dialog_get_content_area (GTK_DIALOG (dialog))),
hbox, TRUE, TRUE, 0);
gtk_container_set_border_width (GTK_CONTAINER (hbox), 12);
gtk_widget_show (hbox);
image = gtk_image_new_from_icon_name ("dialog-warning",
GTK_ICON_SIZE_DIALOG);
gtk_widget_set_valign (image, GTK_ALIGN_START);
gtk_box_pack_start (GTK_BOX (hbox), image, FALSE, FALSE, 0);
gtk_widget_show (image);
main_vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 12);
gtk_box_pack_start (GTK_BOX (hbox), main_vbox, FALSE, FALSE, 0);
gtk_widget_show (main_vbox);
text = g_strdup_printf (message, format_name);
label = gtk_label_new (text);
g_free (text);
pika_label_set_attributes (GTK_LABEL (label),
PANGO_ATTR_SCALE, PANGO_SCALE_LARGE,
PANGO_ATTR_WEIGHT, PANGO_WEIGHT_BOLD,
-1);
gtk_label_set_xalign (GTK_LABEL (label), 0.0);
gtk_label_set_line_wrap (GTK_LABEL (label), TRUE);
gtk_label_set_justify (GTK_LABEL (label), GTK_JUSTIFY_LEFT);
gtk_box_pack_start (GTK_BOX (main_vbox), label, FALSE, FALSE, 0);
gtk_widget_show (label);
gtk_widget_show (dialog);
switch (pika_dialog_run (PIKA_DIALOG (dialog)))
{
case GTK_RESPONSE_OK:
retval = PIKA_EXPORT_EXPORT;
break;
default:
retval = PIKA_EXPORT_CANCEL;
break;
}
gtk_widget_destroy (dialog);
return retval;
}
static PikaExportReturn
export_dialog (GSList *actions,
const gchar *format_name)
{
GtkWidget *dialog;
GtkWidget *hbox;
GtkWidget *image;
GtkWidget *main_vbox;
GtkWidget *label;
GSList *list;
gchar *text;
PikaExportReturn retval;
g_return_val_if_fail (actions != NULL, PIKA_EXPORT_CANCEL);
g_return_val_if_fail (format_name != NULL, PIKA_EXPORT_CANCEL);
dialog = pika_dialog_new (_("Export File"), "pika-export-image",
NULL, 0,
pika_standard_help_func, "pika-export-dialog",
_("_Ignore"), GTK_RESPONSE_NO,
_("_Cancel"), GTK_RESPONSE_CANCEL,
_("_Export"), GTK_RESPONSE_OK,
NULL);
pika_dialog_set_alternative_button_order (GTK_DIALOG (dialog),
GTK_RESPONSE_NO,
GTK_RESPONSE_OK,
GTK_RESPONSE_CANCEL,
-1);
gtk_window_set_resizable (GTK_WINDOW (dialog), FALSE);
pika_window_set_transient (GTK_WINDOW (dialog));
hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 12);
gtk_box_pack_start (GTK_BOX (gtk_dialog_get_content_area (GTK_DIALOG (dialog))),
hbox, TRUE, TRUE, 0);
gtk_container_set_border_width (GTK_CONTAINER (hbox), 12);
gtk_widget_show (hbox);
image = gtk_image_new_from_icon_name ("dialog-information",
GTK_ICON_SIZE_DIALOG);
gtk_widget_set_valign (image, GTK_ALIGN_START);
gtk_box_pack_start (GTK_BOX (hbox), image, FALSE, FALSE, 0);
gtk_widget_show (image);
main_vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 12);
gtk_box_pack_start (GTK_BOX (hbox), main_vbox, FALSE, FALSE, 0);
gtk_widget_show (main_vbox);
/* the headline */
text = g_strdup_printf (_("Your image should be exported before it "
"can be saved as %s for the following reasons:"),
format_name);
label = gtk_label_new (text);
g_free (text);
pika_label_set_attributes (GTK_LABEL (label),
PANGO_ATTR_SCALE, PANGO_SCALE_LARGE,
-1);
gtk_label_set_xalign (GTK_LABEL (label), 0.0);
gtk_label_set_line_wrap (GTK_LABEL (label), TRUE);
gtk_label_set_justify (GTK_LABEL (label), GTK_JUSTIFY_LEFT);
gtk_box_pack_start (GTK_BOX (main_vbox), label, FALSE, FALSE, 0);
gtk_widget_show (label);
for (list = actions; list; list = g_slist_next (list))
{
ExportAction *action = list->data;
GtkWidget *frame;
GtkWidget *vbox;
text = g_strdup_printf (gettext (action->reason), format_name);
frame = pika_frame_new (text);
g_free (text);
gtk_box_pack_start (GTK_BOX (main_vbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 6);
gtk_container_add (GTK_CONTAINER (frame), vbox);
if (action->possibilities[0] && action->possibilities[1])
{
GtkWidget *button;
GSList *radio_group = NULL;
button = gtk_radio_button_new_with_label (radio_group,
gettext (action->possibilities[0]));
gtk_label_set_justify (GTK_LABEL (gtk_bin_get_child (GTK_BIN (button))),
GTK_JUSTIFY_LEFT);
radio_group = gtk_radio_button_get_group (GTK_RADIO_BUTTON (button));
gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);
g_signal_connect (button, "toggled",
G_CALLBACK (export_toggle_callback),
&action->choice);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (button),
(action->choice == 0));
gtk_widget_show (button);
button = gtk_radio_button_new_with_label (radio_group,
gettext (action->possibilities[1]));
gtk_label_set_justify (GTK_LABEL (gtk_bin_get_child (GTK_BIN (button))),
GTK_JUSTIFY_LEFT);
radio_group = gtk_radio_button_get_group (GTK_RADIO_BUTTON (button));
gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (button),
(action->choice == 1));
gtk_widget_show (button);
}
else if (action->possibilities[0])
{
label = gtk_label_new (gettext (action->possibilities[0]));
gtk_label_set_xalign (GTK_LABEL (label), 0.0);
gtk_label_set_line_wrap (GTK_LABEL (label), TRUE);
gtk_label_set_justify (GTK_LABEL (label), GTK_JUSTIFY_LEFT);
gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE, 0);
gtk_widget_show (label);
action->choice = 0;
}
gtk_widget_show (vbox);
}
/* the footline */
label = gtk_label_new (_("The export conversion won't modify your "
"original image."));
pika_label_set_attributes (GTK_LABEL (label),
PANGO_ATTR_STYLE, PANGO_STYLE_ITALIC,
-1);
gtk_label_set_xalign (GTK_LABEL (label), 0.0);
gtk_label_set_line_wrap (GTK_LABEL (label), TRUE);
gtk_label_set_justify (GTK_LABEL (label), GTK_JUSTIFY_LEFT);
gtk_box_pack_start (GTK_BOX (main_vbox), label, FALSE, FALSE, 0);
gtk_widget_show (label);
gtk_widget_show (dialog);
switch (pika_dialog_run (PIKA_DIALOG (dialog)))
{
case GTK_RESPONSE_OK:
retval = PIKA_EXPORT_EXPORT;
break;
case GTK_RESPONSE_NO:
retval = PIKA_EXPORT_IGNORE;
break;
default:
retval = PIKA_EXPORT_CANCEL;
break;
}
gtk_widget_destroy (dialog);
return retval;
}
/**
* pika_export_image:
* @image: Pointer to the image.
* @n_drawables: Size of @drawables.
* @drawables: (array length=n_drawables): Array of pointers to drawables.
* @format_name: The (short) name of the image_format (e.g. JPEG or GIF).
* @capabilities: What can the image_format do?
*
* Takes an image and a drawable to be saved together with a
* description of the capabilities of the image_format. If the
* type of image doesn't match the capabilities of the format
* a dialog is opened that informs the user that the image has
* to be exported and offers to do the necessary conversions.
*
* If the user chooses to export the image, a copy is created.
* This copy is then converted, @image and @drawables are changed to
* point to the new image and the procedure returns PIKA_EXPORT_EXPORT.
* The save_plugin has to take care of deleting the created image using
* pika_image_delete() and the drawables list with g_free() once the
* image has been saved.
*
* If the user chooses to Ignore the export problem, @image and
* @drawables are not altered, PIKA_EXPORT_IGNORE is returned and the
* save_plugin should try to save the original image. If the user
* chooses Cancel, PIKA_EXPORT_CANCEL is returned and the save_plugin
* should quit itself with status %PIKA_PDB_CANCEL.
*
* If @format_name is NULL, no dialogs will be shown and this function
* will behave as if the user clicked on the 'Export' button, if a
* dialog would have been shown.
*
* Returns: An enum of #PikaExportReturn describing the user_action.
**/
PikaExportReturn
pika_export_image (PikaImage **image,
gint *n_drawables,
PikaDrawable ***drawables,
const gchar *format_name,
PikaExportCapabilities capabilities)
{
GSList *actions = NULL;
PikaImageBaseType type;
GList *layers;
GList *iter;
GType drawables_type = G_TYPE_NONE;
gboolean interactive = FALSE;
gboolean added_flatten = FALSE;
gboolean has_layer_masks = FALSE;
gboolean background_has_alpha = TRUE;
PikaExportReturn retval = PIKA_EXPORT_CANCEL;
gint i;
g_return_val_if_fail (pika_image_is_valid (*image) && drawables &&
n_drawables && *n_drawables > 0, FALSE);
for (i = 0; i < *n_drawables; i++)
{
g_return_val_if_fail (pika_item_is_valid (PIKA_ITEM ((*drawables)[i])), FALSE);
if (drawables_type == G_TYPE_NONE ||
g_type_is_a (drawables_type, G_OBJECT_TYPE ((*drawables)[i])))
drawables_type = G_OBJECT_TYPE ((*drawables)[i]);
else
g_return_val_if_fail (g_type_is_a (G_OBJECT_TYPE ((*drawables)[i]), drawables_type), FALSE);
}
/* do some sanity checks */
if (capabilities & PIKA_EXPORT_NEEDS_ALPHA)
capabilities |= PIKA_EXPORT_CAN_HANDLE_ALPHA;
if (capabilities & PIKA_EXPORT_CAN_HANDLE_LAYERS_AS_ANIMATION)
capabilities |= PIKA_EXPORT_CAN_HANDLE_LAYERS;
if (capabilities & PIKA_EXPORT_CAN_HANDLE_LAYER_MASKS)
capabilities |= PIKA_EXPORT_CAN_HANDLE_LAYERS;
if (format_name && g_getenv ("PIKA_INTERACTIVE_EXPORT"))
interactive = TRUE;
/* ask for confirmation if the user is not saving a layer (see bug #51114) */
if (interactive &&
! g_type_is_a (drawables_type, PIKA_TYPE_LAYER) &&
! (capabilities & PIKA_EXPORT_CAN_HANDLE_LAYERS))
{
if (g_type_is_a (drawables_type, PIKA_TYPE_LAYER_MASK))
{
retval = confirm_save_dialog
(_("You are about to save a layer mask as %s.\n"
"This will not save the visible layers."), format_name);
}
else if (g_type_is_a (drawables_type, PIKA_TYPE_CHANNEL))
{
retval = confirm_save_dialog
(_("You are about to save a channel (saved selection) as %s.\n"
"This will not save the visible layers."), format_name);
}
else
{
/* this should not happen */
g_warning ("%s: unknown drawable type!", G_STRFUNC);
}
/* cancel - the user can then select an appropriate layer to save */
if (retval == PIKA_EXPORT_CANCEL)
return PIKA_EXPORT_CANCEL;
}
/* check alpha and layer masks */
layers = pika_image_list_layers (*image);
for (iter = layers; iter; iter = iter->next)
{
PikaLayer *layer = PIKA_LAYER (iter->data);
if (pika_drawable_has_alpha (PIKA_DRAWABLE (layer)))
{
if (! (capabilities & PIKA_EXPORT_CAN_HANDLE_ALPHA))
{
if (! (capabilities & PIKA_EXPORT_CAN_HANDLE_LAYERS))
{
actions = g_slist_prepend (actions, &export_action_flatten);
added_flatten = TRUE;
break;
}
else
{
actions = g_slist_prepend (actions, &export_action_remove_alpha);
break;
}
}
}
else
{
/* If this is the last layer, it's visible and has no alpha
* channel, then the image has a "flat" background
*/
if (iter->next == NULL && pika_item_get_visible (PIKA_ITEM (layer)))
background_has_alpha = FALSE;
if (capabilities & PIKA_EXPORT_NEEDS_ALPHA)
{
actions = g_slist_prepend (actions, &export_action_add_alpha);
break;
}
}
}
if (! added_flatten)
{
for (iter = layers; iter; iter = iter->next)
{
if (pika_layer_get_mask (iter->data))
has_layer_masks = TRUE;
}
}
if (! added_flatten)
{
PikaLayer *layer = PIKA_LAYER (layers->data);
GList *children;
children = pika_item_list_children (PIKA_ITEM (layer));
if ((capabilities & PIKA_EXPORT_CAN_HANDLE_LAYERS) &&
(capabilities & PIKA_EXPORT_NEEDS_CROP))
{
GeglRectangle image_bounds;
gboolean needs_crop = FALSE;
image_bounds.x = 0;
image_bounds.y = 0;
image_bounds.width = pika_image_get_width (*image);
image_bounds.height = pika_image_get_height (*image);
for (iter = layers; iter; iter = iter->next)
{
PikaDrawable *drawable = iter->data;
GeglRectangle layer_bounds;
pika_drawable_get_offsets (drawable,
&layer_bounds.x, &layer_bounds.y);
layer_bounds.width = pika_drawable_get_width (drawable);
layer_bounds.height = pika_drawable_get_height (drawable);
if (! gegl_rectangle_contains (&image_bounds, &layer_bounds))
{
needs_crop = TRUE;
break;
}
}
if (needs_crop)
{
actions = g_slist_prepend (actions,
&export_action_crop_or_resize);
}
}
/* check if layer size != canvas size, opacity != 100%, or offsets != 0 */
if (g_list_length (layers) == 1 &&
! children &&
g_type_is_a (drawables_type, PIKA_TYPE_LAYER) &&
! (capabilities & PIKA_EXPORT_CAN_HANDLE_LAYERS))
{
PikaDrawable *drawable = (*drawables)[0];
gint offset_x;
gint offset_y;
pika_drawable_get_offsets (drawable, &offset_x, &offset_y);
if ((pika_layer_get_opacity (PIKA_LAYER (drawable)) < 100.0) ||
(pika_image_get_width (*image) !=
pika_drawable_get_width (drawable)) ||
(pika_image_get_height (*image) !=
pika_drawable_get_height (drawable)) ||
offset_x || offset_y)
{
if (capabilities & PIKA_EXPORT_CAN_HANDLE_ALPHA)
{
actions = g_slist_prepend (actions,
&export_action_merge_single);
}
else
{
actions = g_slist_prepend (actions,
&export_action_flatten);
}
}
}
/* check multiple layers */
else if (layers && layers->next != NULL)
{
if (capabilities & PIKA_EXPORT_CAN_HANDLE_LAYERS_AS_ANIMATION)
{
if (background_has_alpha ||
capabilities & PIKA_EXPORT_NEEDS_ALPHA)
actions = g_slist_prepend (actions,
&export_action_animate_or_merge);
else
actions = g_slist_prepend (actions,
&export_action_animate_or_flatten);
}
else if (! (capabilities & PIKA_EXPORT_CAN_HANDLE_LAYERS))
{
if (capabilities & PIKA_EXPORT_NEEDS_ALPHA)
actions = g_slist_prepend (actions,
&export_action_merge);
else
actions = g_slist_prepend (actions,
&export_action_merge_or_flatten);
}
}
/* check for a single toplevel layer group */
else if (children)
{
if (! (capabilities & PIKA_EXPORT_CAN_HANDLE_LAYERS))
{
if (capabilities & PIKA_EXPORT_NEEDS_ALPHA)
actions = g_slist_prepend (actions,
&export_action_merge);
else
actions = g_slist_prepend (actions,
&export_action_merge_or_flatten);
}
}
g_list_free (children);
/* check layer masks */
if (has_layer_masks &&
! (capabilities & PIKA_EXPORT_CAN_HANDLE_LAYER_MASKS))
actions = g_slist_prepend (actions, &export_action_apply_masks);
}
g_list_free (layers);
/* check the image type */
type = pika_image_get_base_type (*image);
switch (type)
{
case PIKA_RGB:
if (! (capabilities & PIKA_EXPORT_CAN_HANDLE_RGB))
{
if ((capabilities & PIKA_EXPORT_CAN_HANDLE_INDEXED) &&
(capabilities & PIKA_EXPORT_CAN_HANDLE_GRAY))
actions = g_slist_prepend (actions,
&export_action_convert_indexed_or_grayscale);
else if (capabilities & PIKA_EXPORT_CAN_HANDLE_INDEXED)
actions = g_slist_prepend (actions,
&export_action_convert_indexed);
else if (capabilities & PIKA_EXPORT_CAN_HANDLE_GRAY)
actions = g_slist_prepend (actions,
&export_action_convert_grayscale);
else if (capabilities & PIKA_EXPORT_CAN_HANDLE_BITMAP)
actions = g_slist_prepend (actions,
&export_action_convert_bitmap);
}
break;
case PIKA_GRAY:
if (! (capabilities & PIKA_EXPORT_CAN_HANDLE_GRAY))
{
if ((capabilities & PIKA_EXPORT_CAN_HANDLE_RGB) &&
(capabilities & PIKA_EXPORT_CAN_HANDLE_INDEXED))
actions = g_slist_prepend (actions,
&export_action_convert_rgb_or_indexed);
else if (capabilities & PIKA_EXPORT_CAN_HANDLE_RGB)
actions = g_slist_prepend (actions,
&export_action_convert_rgb);
else if (capabilities & PIKA_EXPORT_CAN_HANDLE_INDEXED)
actions = g_slist_prepend (actions,
&export_action_convert_indexed);
else if (capabilities & PIKA_EXPORT_CAN_HANDLE_BITMAP)
actions = g_slist_prepend (actions,
&export_action_convert_bitmap);
}
break;
case PIKA_INDEXED:
if (! (capabilities & PIKA_EXPORT_CAN_HANDLE_INDEXED))
{
if ((capabilities & PIKA_EXPORT_CAN_HANDLE_RGB) &&
(capabilities & PIKA_EXPORT_CAN_HANDLE_GRAY))
actions = g_slist_prepend (actions,
&export_action_convert_rgb_or_grayscale);
else if (capabilities & PIKA_EXPORT_CAN_HANDLE_RGB)
actions = g_slist_prepend (actions,
&export_action_convert_rgb);
else if (capabilities & PIKA_EXPORT_CAN_HANDLE_GRAY)
actions = g_slist_prepend (actions,
&export_action_convert_grayscale);
else if (capabilities & PIKA_EXPORT_CAN_HANDLE_BITMAP)
{
gint n_colors;
g_free (pika_image_get_colormap (*image, NULL, &n_colors));
if (n_colors > 2)
actions = g_slist_prepend (actions,
&export_action_convert_bitmap);
}
}
break;
}
if (actions)
{
actions = g_slist_reverse (actions);
if (interactive)
retval = export_dialog (actions, format_name);
else
retval = PIKA_EXPORT_EXPORT;
}
else
{
retval = PIKA_EXPORT_IGNORE;
}
if (retval == PIKA_EXPORT_EXPORT)
{
GSList *list;
GList *drawables_in;
GList *drawables_out;
gint i;
*image = pika_image_duplicate (*image);
drawables_in = pika_image_list_selected_layers (*image);
drawables_out = drawables_in;
pika_image_undo_disable (*image);
for (list = actions; list; list = list->next)
{
export_action_perform (list->data, *image, &drawables_out);
if (drawables_in != drawables_out)
{
g_list_free (drawables_in);
drawables_in = drawables_out;
}
}
*n_drawables = g_list_length (drawables_out);
*drawables = g_new (PikaDrawable *, *n_drawables);
for (iter = drawables_out, i = 0; iter; iter = iter->next, i++)
(*drawables)[i] = iter->data;
g_list_free (drawables_out);
}
g_slist_free (actions);
return retval;
}
/**
* pika_export_dialog_new:
* @format_name: The short name of the image_format (e.g. JPEG or PNG).
* @role: The dialog's @role which will be set with
* gtk_window_set_role().
* @help_id: The PIKA help id.
*
* Creates a new export dialog. All file plug-ins should use this
* dialog to get a consistent look on the export dialogs. Use
* pika_export_dialog_get_content_area() to get a vertical #GtkBox to be
* filled with export options. The export dialog is a wrapped
* #PikaDialog.
*
* The dialog response when the user clicks on the Export button is
* %GTK_RESPONSE_OK, and when the Cancel button is clicked it is
* %GTK_RESPONSE_CANCEL.
*
* Returns: (transfer full): The new export dialog.
*
* Since: 2.8
**/
GtkWidget *
pika_export_dialog_new (const gchar *format_name,
const gchar *role,
const gchar *help_id)
{
GtkWidget *dialog;
/* TRANSLATORS: the %s parameter is an image format name (ex: PNG). */
gchar *title = g_strdup_printf (_("Export Image as %s"), format_name);
dialog = pika_dialog_new (title, role,
NULL, 0,
pika_standard_help_func, help_id,
_("_Cancel"), GTK_RESPONSE_CANCEL,
_("_Export"), GTK_RESPONSE_OK,
NULL);
pika_dialog_set_alternative_button_order (GTK_DIALOG (dialog),
GTK_RESPONSE_OK,
GTK_RESPONSE_CANCEL,
-1);
pika_window_set_transient (GTK_WINDOW (dialog));
g_free (title);
return dialog;
}
/**
* pika_export_dialog_get_content_area:
* @dialog: A dialog created with pika_export_dialog_new()
*
* Returns the vertical #GtkBox of the passed export dialog to be filled with
* export options.
*
* Returns: (transfer none): The #GtkBox to fill with export options.
*
* Since: 2.8
**/
GtkWidget *
pika_export_dialog_get_content_area (GtkWidget *dialog)
{
return gtk_dialog_get_content_area (GTK_DIALOG (dialog));
}