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Gimp/app/display/gimpdisplayshell-dnd.c
Jehan d493f0537f Issue #8900 and #9923: reimplementing GimpUnit as a proper class. 
This fixes all our GObject Introspection issues with GimpUnit which was
both an enum and an int-derived type of user-defined units *completing*
the enum values. GIR clearly didn't like this!

Now GimpUnit is a proper class and units are unique objects, allowing to
compare them with an identity test (i.e. `unit == gimp_unit_pixel ()`
tells us if unit is the pixel unit or not), which makes it easy to use,
just like with int, yet adding also methods, making for nicer
introspected API.

As an aside, this also fixes #10738, by having all the built-in units
retrievable even if libgimpbase had not been properly initialized with
gimp_base_init().
I haven't checked in details how GIR works to introspect, but it looks
like it loads the library to inspect and runs functions, hence
triggering some CRITICALS because virtual methods (supposed to be
initialized with gimp_base_init() run by libgimp) are not set. This new
code won't trigger any critical because the vtable method are now not
necessary, at least for all built-in units.

Note that GimpUnit is still in libgimpbase. It could have been moved to
libgimp in order to avoid any virtual method table (since we need to
keep core and libgimp side's units in sync, PDB is required), but too
many libgimpwidgets widgets were already using GimpUnit. And technically
most of GimpUnit logic doesn't require PDB (only the creation/sync
part). This is one of the reasons why user-created GimpUnit list is
handled and stored differently from other types of objects.

Globally this simplifies the code a lot too and we don't need separate
implementations of various utils for core and libgimp, which means less
prone to errors.
2024-08-02 10:46:38 +02:00

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* 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 <gegl.h>
#include <gtk/gtk.h>
#include "libgimpbase/gimpbase.h"
#include "libgimpwidgets/gimpwidgets.h"
#include "display-types.h"
#include "core/gimp.h"
#include "core/gimp-edit.h"
#include "core/gimpbuffer.h"
#include "core/gimpdrawable-edit.h"
#include "core/gimpfilloptions.h"
#include "core/gimpimage.h"
#include "core/gimpimage-new.h"
#include "core/gimpimage-undo.h"
#include "core/gimplayer.h"
#include "core/gimplayer-new.h"
#include "core/gimplayermask.h"
#include "core/gimppattern.h"
#include "core/gimpprogress.h"
#include "file/file-open.h"
#include "text/gimptext.h"
#include "text/gimptextlayer.h"
#include "vectors/gimppath.h"
#include "vectors/gimppath-import.h"
#include "widgets/gimpdnd.h"
#include "gimpdisplay.h"
#include "gimpdisplayshell.h"
#include "gimpdisplayshell-dnd.h"
#include "gimpdisplayshell-transform.h"
#include "gimp-log.h"
#include "gimp-intl.h"
/* local function prototypes */
static void gimp_display_shell_drop_drawable (GtkWidget *widget,
gint x,
gint y,
GimpViewable *viewable,
gpointer data);
static void gimp_display_shell_drop_path (GtkWidget *widget,
gint x,
gint y,
GimpViewable *viewable,
gpointer data);
static void gimp_display_shell_drop_svg (GtkWidget *widget,
gint x,
gint y,
const guchar *svg_data,
gsize svg_data_length,
gpointer data);
static void gimp_display_shell_drop_pattern (GtkWidget *widget,
gint x,
gint y,
GimpViewable *viewable,
gpointer data);
static void gimp_display_shell_drop_color (GtkWidget *widget,
gint x,
gint y,
GeglColor *color,
gpointer data);
static void gimp_display_shell_drop_buffer (GtkWidget *widget,
gint x,
gint y,
GimpViewable *viewable,
gpointer data);
static void gimp_display_shell_drop_uri_list (GtkWidget *widget,
gint x,
gint y,
GList *uri_list,
gpointer data);
static void gimp_display_shell_drop_component (GtkWidget *widget,
gint x,
gint y,
GimpImage *image,
GimpChannelType component,
gpointer data);
static void gimp_display_shell_drop_pixbuf (GtkWidget *widget,
gint x,
gint y,
GdkPixbuf *pixbuf,
gpointer data);
/* public functions */
void
gimp_display_shell_dnd_init (GimpDisplayShell *shell)
{
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
gimp_dnd_viewable_dest_add (shell->canvas, GIMP_TYPE_LAYER,
gimp_display_shell_drop_drawable,
shell);
gimp_dnd_viewable_dest_add (shell->canvas, GIMP_TYPE_LAYER_MASK,
gimp_display_shell_drop_drawable,
shell);
gimp_dnd_viewable_dest_add (shell->canvas, GIMP_TYPE_CHANNEL,
gimp_display_shell_drop_drawable,
shell);
gimp_dnd_viewable_dest_add (shell->canvas, GIMP_TYPE_PATH,
gimp_display_shell_drop_path,
shell);
gimp_dnd_viewable_dest_add (shell->canvas, GIMP_TYPE_PATTERN,
gimp_display_shell_drop_pattern,
shell);
gimp_dnd_viewable_dest_add (shell->canvas, GIMP_TYPE_BUFFER,
gimp_display_shell_drop_buffer,
shell);
gimp_dnd_color_dest_add (shell->canvas,
gimp_display_shell_drop_color,
shell);
gimp_dnd_component_dest_add (shell->canvas,
gimp_display_shell_drop_component,
shell);
gimp_dnd_uri_list_dest_add (shell->canvas,
gimp_display_shell_drop_uri_list,
shell);
gimp_dnd_svg_dest_add (shell->canvas,
gimp_display_shell_drop_svg,
shell);
gimp_dnd_pixbuf_dest_add (shell->canvas,
gimp_display_shell_drop_pixbuf,
shell);
}
/* private functions */
/*
* Position the dropped item in the middle of the viewport.
*/
static void
gimp_display_shell_dnd_position_item (GimpDisplayShell *shell,
GimpImage *image,
GimpItem *item)
{
gint item_width = gimp_item_get_width (item);
gint item_height = gimp_item_get_height (item);
gint off_x, off_y;
if (item_width >= gimp_image_get_width (image) &&
item_height >= gimp_image_get_height (image))
{
off_x = (gimp_image_get_width (image) - item_width) / 2;
off_y = (gimp_image_get_height (image) - item_height) / 2;
}
else
{
gint x, y;
gint width, height;
gimp_display_shell_untransform_viewport (
shell,
! gimp_display_shell_get_infinite_canvas (shell),
&x, &y, &width, &height);
off_x = x + (width - item_width) / 2;
off_y = y + (height - item_height) / 2;
}
gimp_item_translate (item,
off_x - gimp_item_get_offset_x (item),
off_y - gimp_item_get_offset_y (item),
FALSE);
}
static void
gimp_display_shell_dnd_flush (GimpDisplayShell *shell,
GimpImage *image)
{
gimp_display_shell_present (shell);
gimp_image_flush (image);
gimp_context_set_display (gimp_get_user_context (shell->display->gimp),
shell->display);
}
static void
gimp_display_shell_drop_drawable (GtkWidget *widget,
gint x,
gint y,
GimpViewable *viewable,
gpointer data)
{
GimpDisplayShell *shell = GIMP_DISPLAY_SHELL (data);
GimpImage *image = gimp_display_get_image (shell->display);
GType new_type;
GimpItem *new_item;
GIMP_LOG (DND, NULL);
if (shell->display->gimp->busy)
return;
if (! image)
{
image = gimp_image_new_from_drawable (shell->display->gimp,
GIMP_DRAWABLE (viewable));
gimp_create_display (shell->display->gimp, image, gimp_unit_pixel (), 1.0,
G_OBJECT (gimp_widget_get_monitor (widget)));
g_object_unref (image);
return;
}
if (GIMP_IS_LAYER (viewable))
new_type = G_TYPE_FROM_INSTANCE (viewable);
else
new_type = GIMP_TYPE_LAYER;
new_item = gimp_item_convert (GIMP_ITEM (viewable), image, new_type);
if (new_item)
{
GimpLayer *new_layer = GIMP_LAYER (new_item);
gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_EDIT_PASTE,
_("Drop New Layer"));
gimp_display_shell_dnd_position_item (shell, image, new_item);
gimp_item_set_visible (new_item, TRUE, FALSE);
gimp_image_add_layer (image, new_layer,
GIMP_IMAGE_ACTIVE_PARENT, -1, TRUE);
gimp_image_undo_group_end (image);
gimp_display_shell_dnd_flush (shell, image);
}
}
static void
gimp_display_shell_drop_path (GtkWidget *widget,
gint x,
gint y,
GimpViewable *viewable,
gpointer data)
{
GimpDisplayShell *shell = GIMP_DISPLAY_SHELL (data);
GimpImage *image = gimp_display_get_image (shell->display);
GimpItem *new_item;
GIMP_LOG (DND, NULL);
if (shell->display->gimp->busy)
return;
if (! image)
return;
new_item = gimp_item_convert (GIMP_ITEM (viewable),
image, G_TYPE_FROM_INSTANCE (viewable));
if (new_item)
{
GimpPath *new_path = GIMP_PATH (new_item);
gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_EDIT_PASTE,
_("Drop New Path"));
gimp_image_add_path (image, new_path,
GIMP_IMAGE_ACTIVE_PARENT, -1, TRUE);
gimp_image_undo_group_end (image);
gimp_display_shell_dnd_flush (shell, image);
}
}
static void
gimp_display_shell_drop_svg (GtkWidget *widget,
gint x,
gint y,
const guchar *svg_data,
gsize svg_data_len,
gpointer data)
{
GimpDisplayShell *shell = GIMP_DISPLAY_SHELL (data);
GimpImage *image = gimp_display_get_image (shell->display);
GError *error = NULL;
GIMP_LOG (DND, NULL);
if (shell->display->gimp->busy)
return;
if (! image)
return;
if (! gimp_path_import_buffer (image,
(const gchar *) svg_data, svg_data_len,
TRUE, FALSE,
GIMP_IMAGE_ACTIVE_PARENT, -1,
NULL, &error))
{
gimp_message_literal (shell->display->gimp, G_OBJECT (shell->display),
GIMP_MESSAGE_ERROR,
error->message);
g_clear_error (&error);
}
else
{
gimp_display_shell_dnd_flush (shell, image);
}
}
static void
gimp_display_shell_dnd_fill (GimpDisplayShell *shell,
GimpFillOptions *options,
const gchar *undo_desc)
{
GimpImage *image = gimp_display_get_image (shell->display);
GList *drawables;
GList *iter;
if (shell->display->gimp->busy)
return;
if (! image)
return;
drawables = gimp_image_get_selected_drawables (image);
if (! drawables)
return;
for (iter = drawables; iter; iter = iter->next)
{
if (gimp_viewable_get_children (iter->data))
{
gimp_message_literal (shell->display->gimp, G_OBJECT (shell->display),
GIMP_MESSAGE_ERROR,
_("Cannot modify the pixels of layer groups."));
g_list_free (drawables);
return;
}
if (gimp_item_is_content_locked (iter->data, NULL))
{
gimp_message_literal (shell->display->gimp, G_OBJECT (shell->display),
GIMP_MESSAGE_ERROR,
_("A selected layer's pixels are locked."));
g_list_free (drawables);
return;
}
}
gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_PAINT, undo_desc);
for (iter = drawables; iter; iter = iter->next)
{
/* FIXME: there should be a virtual method for this that the
* GimpTextLayer can override.
*/
if (gimp_item_is_text_layer (iter->data) &&
(gimp_fill_options_get_style (options) == GIMP_FILL_STYLE_FG_COLOR ||
gimp_fill_options_get_style (options) == GIMP_FILL_STYLE_BG_COLOR))
{
GeglColor *color;
if (gimp_fill_options_get_style (options) == GIMP_FILL_STYLE_FG_COLOR)
color = gimp_context_get_foreground (GIMP_CONTEXT (options));
else
color = gimp_context_get_background (GIMP_CONTEXT (options));
gimp_text_layer_set (iter->data, NULL,
"color", color,
NULL);
}
else
{
gimp_drawable_edit_fill (iter->data, options, undo_desc);
}
}
g_list_free (drawables);
gimp_image_undo_group_end (image);
gimp_display_shell_dnd_flush (shell, image);
}
static void
gimp_display_shell_drop_pattern (GtkWidget *widget,
gint x,
gint y,
GimpViewable *viewable,
gpointer data)
{
GimpDisplayShell *shell = GIMP_DISPLAY_SHELL (data);
GimpFillOptions *options = gimp_fill_options_new (shell->display->gimp,
NULL, FALSE);
GIMP_LOG (DND, NULL);
gimp_fill_options_set_style (options, GIMP_FILL_STYLE_PATTERN);
gimp_context_set_pattern (GIMP_CONTEXT (options), GIMP_PATTERN (viewable));
gimp_display_shell_dnd_fill (shell, options,
C_("undo-type", "Drop pattern to layer"));
g_object_unref (options);
}
static void
gimp_display_shell_drop_color (GtkWidget *widget,
gint x,
gint y,
GeglColor *color,
gpointer data)
{
GimpDisplayShell *shell = GIMP_DISPLAY_SHELL (data);
GimpFillOptions *options = gimp_fill_options_new (shell->display->gimp,
NULL, FALSE);
GIMP_LOG (DND, NULL);
gimp_fill_options_set_style (options, GIMP_FILL_STYLE_FG_COLOR);
gimp_context_set_foreground (GIMP_CONTEXT (options), color);
gimp_display_shell_dnd_fill (shell, options,
C_("undo-type", "Drop color to layer"));
g_object_unref (options);
}
static void
gimp_display_shell_drop_buffer (GtkWidget *widget,
gint drop_x,
gint drop_y,
GimpViewable *viewable,
gpointer data)
{
GimpDisplayShell *shell = GIMP_DISPLAY_SHELL (data);
GimpImage *image = gimp_display_get_image (shell->display);
GimpContext *context;
GList *drawables;
GimpBuffer *buffer;
GimpPasteType paste_type;
gint x, y, width, height;
GIMP_LOG (DND, NULL);
if (shell->display->gimp->busy)
return;
if (! image)
{
image = gimp_image_new_from_buffer (shell->display->gimp,
GIMP_BUFFER (viewable));
gimp_create_display (image->gimp, image, gimp_unit_pixel (), 1.0,
G_OBJECT (gimp_widget_get_monitor (widget)));
g_object_unref (image);
return;
}
paste_type = GIMP_PASTE_TYPE_NEW_LAYER_OR_FLOATING;
drawables = gimp_image_get_selected_drawables (image);
context = gimp_get_user_context (shell->display->gimp);
buffer = GIMP_BUFFER (viewable);
gimp_display_shell_untransform_viewport (
shell,
! gimp_display_shell_get_infinite_canvas (shell),
&x, &y, &width, &height);
/* FIXME: popup a menu for selecting "Paste Into" */
g_list_free (gimp_edit_paste (image, drawables, GIMP_OBJECT (buffer),
paste_type, context, FALSE,
x, y, width, height));
g_list_free (drawables);
gimp_display_shell_dnd_flush (shell, image);
}
static void
gimp_display_shell_drop_uri_list (GtkWidget *widget,
gint x,
gint y,
GList *uri_list,
gpointer data)
{
GimpDisplayShell *shell = GIMP_DISPLAY_SHELL (data);
GimpImage *image;
GimpContext *context;
GList *list;
gboolean open_as_layers;
/* If the app is already being torn down, shell->display might be
* NULL here. Play it safe.
*/
if (! shell->display)
return;
image = gimp_display_get_image (shell->display);
context = gimp_get_user_context (shell->display->gimp);
GIMP_LOG (DND, NULL);
open_as_layers = (image != NULL);
if (image)
g_object_ref (image);
for (list = uri_list; list; list = g_list_next (list))
{
GFile *file = g_file_new_for_uri (list->data);
GimpPDBStatusType status;
GError *error = NULL;
gboolean warn = FALSE;
if (! shell->display)
{
/* It seems as if GIMP is being torn down for quitting. Bail out. */
g_object_unref (file);
g_clear_object (&image);
return;
}
if (open_as_layers)
{
GList *new_layers;
new_layers = file_open_layers (shell->display->gimp, context,
GIMP_PROGRESS (shell->display),
image, FALSE,
file, GIMP_RUN_INTERACTIVE, NULL,
&status, &error);
if (new_layers)
{
gint x = 0;
gint y = 0;
gint width = gimp_image_get_width (image);
gint height = gimp_image_get_height (image);
if (gimp_display_get_image (shell->display))
{
gimp_display_shell_untransform_viewport (
shell,
! gimp_display_shell_get_infinite_canvas (shell),
&x, &y, &width, &height);
}
gimp_image_add_layers (image, new_layers,
GIMP_IMAGE_ACTIVE_PARENT, -1,
x, y, width, height,
_("Drop layers"));
g_list_free (new_layers);
}
else if (status != GIMP_PDB_CANCEL && status != GIMP_PDB_SUCCESS)
{
warn = TRUE;
}
}
else if (gimp_display_get_image (shell->display))
{
/* open any subsequent images in a new display */
GimpImage *new_image;
new_image = file_open_with_display (shell->display->gimp, context,
NULL,
file, FALSE,
G_OBJECT (gimp_widget_get_monitor (widget)),
&status, &error);
if (! new_image && status != GIMP_PDB_CANCEL && status != GIMP_PDB_SUCCESS)
warn = TRUE;
}
else
{
/* open the first image in the empty display */
image = file_open_with_display (shell->display->gimp, context,
GIMP_PROGRESS (shell->display),
file, FALSE,
G_OBJECT (gimp_widget_get_monitor (widget)),
&status, &error);
if (image)
{
g_object_ref (image);
}
else if (status != GIMP_PDB_CANCEL && status != GIMP_PDB_SUCCESS)
{
warn = TRUE;
}
}
/* Something above might have run a few rounds of the main loop. Check
* that shell->display is still there, otherwise ignore this as the app
* is being torn down for quitting.
*/
if (warn && shell->display)
{
gimp_message (shell->display->gimp, G_OBJECT (shell->display),
GIMP_MESSAGE_ERROR,
_("Opening '%s' failed:\n\n%s"),
gimp_file_get_utf8_name (file), error->message);
g_clear_error (&error);
}
g_object_unref (file);
}
if (image)
gimp_display_shell_dnd_flush (shell, image);
g_clear_object (&image);
}
static void
gimp_display_shell_drop_component (GtkWidget *widget,
gint x,
gint y,
GimpImage *image,
GimpChannelType component,
gpointer data)
{
GimpDisplayShell *shell = GIMP_DISPLAY_SHELL (data);
GimpImage *dest_image = gimp_display_get_image (shell->display);
GimpChannel *channel;
GimpItem *new_item;
const gchar *desc;
GIMP_LOG (DND, NULL);
if (shell->display->gimp->busy)
return;
if (! dest_image)
{
dest_image = gimp_image_new_from_component (image->gimp,
image, component);
gimp_create_display (dest_image->gimp, dest_image, gimp_unit_pixel (), 1.0,
G_OBJECT (gimp_widget_get_monitor (widget)));
g_object_unref (dest_image);
return;
}
channel = gimp_channel_new_from_component (image, component, NULL, NULL);
new_item = gimp_item_convert (GIMP_ITEM (channel),
dest_image, GIMP_TYPE_LAYER);
g_object_unref (channel);
if (new_item)
{
GimpLayer *new_layer = GIMP_LAYER (new_item);
gimp_enum_get_value (GIMP_TYPE_CHANNEL_TYPE, component,
NULL, NULL, &desc, NULL);
gimp_object_take_name (GIMP_OBJECT (new_layer),
g_strdup_printf (_("%s Channel Copy"), desc));
gimp_image_undo_group_start (dest_image, GIMP_UNDO_GROUP_EDIT_PASTE,
_("Drop New Layer"));
gimp_display_shell_dnd_position_item (shell, image, new_item);
gimp_image_add_layer (dest_image, new_layer,
GIMP_IMAGE_ACTIVE_PARENT, -1, TRUE);
gimp_image_undo_group_end (dest_image);
gimp_display_shell_dnd_flush (shell, dest_image);
}
}
static void
gimp_display_shell_drop_pixbuf (GtkWidget *widget,
gint x,
gint y,
GdkPixbuf *pixbuf,
gpointer data)
{
GimpDisplayShell *shell = GIMP_DISPLAY_SHELL (data);
GimpImage *image = gimp_display_get_image (shell->display);
GimpLayer *new_layer;
gboolean has_alpha = FALSE;
GIMP_LOG (DND, NULL);
if (shell->display->gimp->busy)
return;
if (! image)
{
image = gimp_image_new_from_pixbuf (shell->display->gimp, pixbuf,
_("Dropped Buffer"));
gimp_create_display (image->gimp, image, gimp_unit_pixel (), 1.0,
G_OBJECT (gimp_widget_get_monitor (widget)));
g_object_unref (image);
return;
}
if (gdk_pixbuf_get_n_channels (pixbuf) == 2 ||
gdk_pixbuf_get_n_channels (pixbuf) == 4)
{
has_alpha = TRUE;
}
new_layer =
gimp_layer_new_from_pixbuf (pixbuf, image,
gimp_image_get_layer_format (image, has_alpha),
_("Dropped Buffer"),
GIMP_OPACITY_OPAQUE,
gimp_image_get_default_new_layer_mode (image));
if (new_layer)
{
GimpItem *new_item = GIMP_ITEM (new_layer);
gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_EDIT_PASTE,
_("Drop New Layer"));
gimp_display_shell_dnd_position_item (shell, image, new_item);
gimp_image_add_layer (image, new_layer,
GIMP_IMAGE_ACTIVE_PARENT, -1, TRUE);
gimp_image_undo_group_end (image);
gimp_display_shell_dnd_flush (shell, image);
}
}
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