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gimp/libgimpwidgets/gimppreview.c

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Import Upstream version 2.10.32
2022-11-23 10:54:48 +08:00
/* LIBGIMP - The GIMP Library
* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
*
* gimppreview.c
*
* 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
* Lesser 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 <gegl.h>
#include <gtk/gtk.h>
#include "libgimpmath/gimpmath.h"
#include "gimpwidgets.h"
#include "gimppreview.h"
#include "libgimp/libgimp-intl.h"
/**
* SECTION: gimppreview
* @title: GimpPreview
* @short_description: A widget providing a #GimpPreviewArea plus
* framework to update the preview.
*
* A widget providing a #GimpPreviewArea plus framework to update the
* preview.
**/
#define DEFAULT_SIZE 200
#define PREVIEW_TIMEOUT 200
enum
{
INVALIDATED,
LAST_SIGNAL
};
enum
{
PROP_0,
PROP_UPDATE
};
typedef struct
{
GtkWidget *controls;
} GimpPreviewPrivate;
#define GIMP_PREVIEW_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GIMP_TYPE_PREVIEW, GimpPreviewPrivate))
static void gimp_preview_class_init (GimpPreviewClass *klass);
static void gimp_preview_init (GimpPreview *preview);
static void gimp_preview_dispose (GObject *object);
static void gimp_preview_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void gimp_preview_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void gimp_preview_direction_changed (GtkWidget *widget,
GtkTextDirection prev_dir);
static gboolean gimp_preview_popup_menu (GtkWidget *widget);
static void gimp_preview_area_realize (GtkWidget *widget,
GimpPreview *preview);
static void gimp_preview_area_unrealize (GtkWidget *widget,
GimpPreview *preview);
static void gimp_preview_area_size_allocate (GtkWidget *widget,
GtkAllocation *allocation,
GimpPreview *preview);
static void gimp_preview_area_set_cursor (GimpPreview *preview);
static gboolean gimp_preview_area_event (GtkWidget *area,
GdkEvent *event,
GimpPreview *preview);
static void gimp_preview_toggle_callback (GtkWidget *toggle,
GimpPreview *preview);
static void gimp_preview_notify_checks (GimpPreview *preview);
static gboolean gimp_preview_invalidate_now (GimpPreview *preview);
static void gimp_preview_real_set_cursor (GimpPreview *preview);
static void gimp_preview_real_transform (GimpPreview *preview,
gint src_x,
gint src_y,
gint *dest_x,
gint *dest_y);
static void gimp_preview_real_untransform (GimpPreview *preview,
gint src_x,
gint src_y,
gint *dest_x,
gint *dest_y);
static guint preview_signals[LAST_SIGNAL] = { 0 };
static GtkBoxClass *parent_class = NULL;
GType
gimp_preview_get_type (void)
{
static GType preview_type = 0;
if (! preview_type)
{
const GTypeInfo preview_info =
{
sizeof (GimpPreviewClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gimp_preview_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GimpPreview),
0, /* n_preallocs */
(GInstanceInitFunc) gimp_preview_init,
};
preview_type = g_type_register_static (GTK_TYPE_BOX,
"GimpPreview",
&preview_info,
G_TYPE_FLAG_ABSTRACT);
}
return preview_type;
}
static void
gimp_preview_class_init (GimpPreviewClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
preview_signals[INVALIDATED] =
g_signal_new ("invalidated",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpPreviewClass, invalidated),
NULL, NULL,
g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0);
object_class->dispose = gimp_preview_dispose;
object_class->get_property = gimp_preview_get_property;
object_class->set_property = gimp_preview_set_property;
widget_class->direction_changed = gimp_preview_direction_changed;
widget_class->popup_menu = gimp_preview_popup_menu;
klass->draw = NULL;
klass->draw_thumb = NULL;
klass->draw_buffer = NULL;
klass->set_cursor = gimp_preview_real_set_cursor;
klass->transform = gimp_preview_real_transform;
klass->untransform = gimp_preview_real_untransform;
g_type_class_add_private (object_class, sizeof (GimpPreviewPrivate));
g_object_class_install_property (object_class,
PROP_UPDATE,
g_param_spec_boolean ("update",
"Update",
"Whether the preview should update automatically",
TRUE,
GIMP_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
gtk_widget_class_install_style_property (widget_class,
g_param_spec_int ("size",
"Size",
"The preview's size",
1, 1024,
DEFAULT_SIZE,
GIMP_PARAM_READABLE));
}
static void
gimp_preview_init (GimpPreview *preview)
{
GimpPreviewPrivate *priv = GIMP_PREVIEW_GET_PRIVATE (preview);
GtkWidget *frame;
gdouble xalign = 0.0;
gtk_orientable_set_orientation (GTK_ORIENTABLE (preview),
GTK_ORIENTATION_VERTICAL);
gtk_box_set_homogeneous (GTK_BOX (preview), FALSE);
gtk_box_set_spacing (GTK_BOX (preview), 6);
if (gtk_widget_get_direction (GTK_WIDGET (preview)) == GTK_TEXT_DIR_RTL)
xalign = 1.0;
preview->frame = gtk_aspect_frame_new (NULL, xalign, 0.0, 1.0, TRUE);
gtk_frame_set_shadow_type (GTK_FRAME (preview->frame), GTK_SHADOW_NONE);
gtk_box_pack_start (GTK_BOX (preview), preview->frame, TRUE, TRUE, 0);
gtk_widget_show (preview->frame);
preview->table = gtk_table_new (3, 2, FALSE);
gtk_table_set_row_spacing (GTK_TABLE (preview->table), 1, 3);
gtk_container_add (GTK_CONTAINER (preview->frame), preview->table);
gtk_widget_show (preview->table);
preview->timeout_id = 0;
preview->xmin = preview->ymin = 0;
preview->xmax = preview->ymax = 1;
preview->width = preview->xmax - preview->xmin;
preview->height = preview->ymax - preview->ymin;
preview->xoff = 0;
preview->yoff = 0;
preview->default_cursor = NULL;
/* preview area */
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
gtk_table_attach (GTK_TABLE (preview->table), frame, 0, 1, 0, 1,
GTK_FILL | GTK_EXPAND, GTK_FILL | GTK_EXPAND, 0, 0);
gtk_widget_show (frame);
preview->area = gimp_preview_area_new ();
gtk_container_add (GTK_CONTAINER (frame), preview->area);
gtk_widget_show (preview->area);
g_signal_connect_swapped (preview->area, "notify::check-size",
G_CALLBACK (gimp_preview_notify_checks),
preview);
g_signal_connect_swapped (preview->area, "notify::check-type",
G_CALLBACK (gimp_preview_notify_checks),
preview);
gtk_widget_add_events (preview->area,
GDK_BUTTON_PRESS_MASK |
GDK_BUTTON_RELEASE_MASK |
GDK_POINTER_MOTION_HINT_MASK |
GDK_BUTTON_MOTION_MASK);
g_signal_connect (preview->area, "event",
G_CALLBACK (gimp_preview_area_event),
preview);
g_signal_connect (preview->area, "realize",
G_CALLBACK (gimp_preview_area_realize),
preview);
g_signal_connect (preview->area, "unrealize",
G_CALLBACK (gimp_preview_area_unrealize),
preview);
g_signal_connect_data (preview->area, "realize",
G_CALLBACK (gimp_preview_area_set_cursor),
preview, NULL, G_CONNECT_AFTER | G_CONNECT_SWAPPED);
g_signal_connect (preview->area, "size-allocate",
G_CALLBACK (gimp_preview_area_size_allocate),
preview);
g_signal_connect_data (preview->area, "size-allocate",
G_CALLBACK (gimp_preview_area_set_cursor),
preview, NULL, G_CONNECT_AFTER | G_CONNECT_SWAPPED);
priv->controls = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
gtk_table_attach (GTK_TABLE (preview->table), priv->controls, 0, 2, 2, 3,
GTK_FILL | GTK_EXPAND, GTK_FILL, 0, 0);
gtk_widget_show (priv->controls);
/* toggle button to (de)activate the instant preview */
preview->toggle = gtk_check_button_new_with_mnemonic (_("_Preview"));
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (preview->toggle),
preview->update_preview);
gtk_box_pack_start (GTK_BOX (priv->controls), preview->toggle, TRUE, TRUE, 0);
gtk_widget_show (preview->toggle);
g_signal_connect (preview->toggle, "toggled",
G_CALLBACK (gimp_preview_toggle_callback),
preview);
}
static void
gimp_preview_dispose (GObject *object)
{
GimpPreview *preview = GIMP_PREVIEW (object);
if (preview->timeout_id)
{
g_source_remove (preview->timeout_id);
preview->timeout_id = 0;
}
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gimp_preview_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GimpPreview *preview = GIMP_PREVIEW (object);
switch (property_id)
{
case PROP_UPDATE:
g_value_set_boolean (value, preview->update_preview);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_preview_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GimpPreview *preview = GIMP_PREVIEW (object);
switch (property_id)
{
case PROP_UPDATE:
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (preview->toggle),
g_value_get_boolean (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_preview_direction_changed (GtkWidget *widget,
GtkTextDirection prev_dir)
{
GimpPreview *preview = GIMP_PREVIEW (widget);
gdouble xalign = 0.0;
if (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL)
xalign = 1.0;
gtk_aspect_frame_set (GTK_ASPECT_FRAME (preview->frame),
xalign, 0.0, 1.0, TRUE);
}
static gboolean
gimp_preview_popup_menu (GtkWidget *widget)
{
GimpPreview *preview = GIMP_PREVIEW (widget);
gimp_preview_area_menu_popup (GIMP_PREVIEW_AREA (preview->area), NULL);
return TRUE;
}
static void
gimp_preview_area_realize (GtkWidget *widget,
GimpPreview *preview)
{
GdkDisplay *display = gtk_widget_get_display (widget);
g_return_if_fail (preview->cursor_busy == NULL);
preview->cursor_busy = gdk_cursor_new_for_display (display, GDK_WATCH);
}
static void
gimp_preview_area_unrealize (GtkWidget *widget,
GimpPreview *preview)
{
if (preview->cursor_busy)
{
gdk_cursor_unref (preview->cursor_busy);
preview->cursor_busy = NULL;
}
}
static void
gimp_preview_area_size_allocate (GtkWidget *widget,
GtkAllocation *allocation,
GimpPreview *preview)
{
gint width = preview->xmax - preview->xmin;
gint height = preview->ymax - preview->ymin;
preview->width = MIN (width, allocation->width);
preview->height = MIN (height, allocation->height);
gimp_preview_draw (preview);
gimp_preview_invalidate (preview);
}
static void
gimp_preview_area_set_cursor (GimpPreview *preview)
{
GIMP_PREVIEW_GET_CLASS (preview)->set_cursor (preview);
}
static gboolean
gimp_preview_area_event (GtkWidget *area,
GdkEvent *event,
GimpPreview *preview)
{
GdkEventButton *button_event = (GdkEventButton *) event;
switch (event->type)
{
case GDK_BUTTON_PRESS:
switch (button_event->button)
{
case 3:
gimp_preview_area_menu_popup (GIMP_PREVIEW_AREA (area), button_event);
return TRUE;
}
break;
default:
break;
}
return FALSE;
}
static void
gimp_preview_toggle_callback (GtkWidget *toggle,
GimpPreview *preview)
{
if (gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (toggle)))
{
preview->update_preview = TRUE;
g_object_notify (G_OBJECT (preview), "update");
if (preview->timeout_id)
g_source_remove (preview->timeout_id);
gimp_preview_invalidate_now (preview);
}
else
{
preview->update_preview = FALSE;
g_object_notify (G_OBJECT (preview), "update");
gimp_preview_draw (preview);
}
}
static void
gimp_preview_notify_checks (GimpPreview *preview)
{
gimp_preview_draw (preview);
gimp_preview_invalidate (preview);
}
static gboolean
gimp_preview_invalidate_now (GimpPreview *preview)
{
GtkWidget *toplevel = gtk_widget_get_toplevel (GTK_WIDGET (preview));
GimpPreviewClass *class = GIMP_PREVIEW_GET_CLASS (preview);
gimp_preview_draw (preview);
preview->timeout_id = 0;
if (toplevel && gtk_widget_get_realized (toplevel))
{
gdk_window_set_cursor (gtk_widget_get_window (toplevel),
preview->cursor_busy);
gdk_window_set_cursor (gtk_widget_get_window (preview->area),
preview->cursor_busy);
gdk_flush ();
g_signal_emit (preview, preview_signals[INVALIDATED], 0);
class->set_cursor (preview);
gdk_window_set_cursor (gtk_widget_get_window (toplevel), NULL);
}
else
{
g_signal_emit (preview, preview_signals[INVALIDATED], 0);
}
return FALSE;
}
static void
gimp_preview_real_set_cursor (GimpPreview *preview)
{
if (gtk_widget_get_realized (preview->area))
gdk_window_set_cursor (gtk_widget_get_window (preview->area),
preview->default_cursor);
}
static void
gimp_preview_real_transform (GimpPreview *preview,
gint src_x,
gint src_y,
gint *dest_x,
gint *dest_y)
{
*dest_x = src_x - preview->xoff - preview->xmin;
*dest_y = src_y - preview->yoff - preview->ymin;
}
static void
gimp_preview_real_untransform (GimpPreview *preview,
gint src_x,
gint src_y,
gint *dest_x,
gint *dest_y)
{
*dest_x = src_x + preview->xoff + preview->xmin;
*dest_y = src_y + preview->yoff + preview->ymin;
}
/**
* gimp_preview_set_update:
* @preview: a #GimpPreview widget
* @update: %TRUE if the preview should invalidate itself when being
* scrolled or when gimp_preview_invalidate() is being called
*
* Sets the state of the "Preview" check button.
*
* Since: 2.2
**/
void
gimp_preview_set_update (GimpPreview *preview,
gboolean update)
{
g_return_if_fail (GIMP_IS_PREVIEW (preview));
g_object_set (preview,
"update", update,
NULL);
}
/**
* gimp_preview_get_update:
* @preview: a #GimpPreview widget
*
* Return value: the state of the "Preview" check button.
*
* Since: 2.2
**/
gboolean
gimp_preview_get_update (GimpPreview *preview)
{
g_return_val_if_fail (GIMP_IS_PREVIEW (preview), FALSE);
return preview->update_preview;
}
/**
* gimp_preview_set_bounds:
* @preview: a #GimpPreview widget
* @xmin: the minimum X value
* @ymin: the minimum Y value
* @xmax: the maximum X value
* @ymax: the maximum Y value
*
* Sets the lower and upper limits for the previewed area. The
* difference between the upper and lower value is used to set the
* maximum size of the #GimpPreviewArea used in the @preview.
*
* Since: 2.2
**/
void
gimp_preview_set_bounds (GimpPreview *preview,
gint xmin,
gint ymin,
gint xmax,
gint ymax)
{
g_return_if_fail (GIMP_IS_PREVIEW (preview));
g_return_if_fail (xmax > xmin);
g_return_if_fail (ymax > ymin);
preview->xmin = xmin;
preview->ymin = ymin;
preview->xmax = xmax;
preview->ymax = ymax;
gimp_preview_area_set_max_size (GIMP_PREVIEW_AREA (preview->area),
xmax - xmin,
ymax - ymin);
}
/**
* gimp_preview_get_size:
* @preview: a #GimpPreview widget
* @width: return location for the preview area width
* @height: return location for the preview area height
*
* Since: 2.2
**/
void
gimp_preview_get_size (GimpPreview *preview,
gint *width,
gint *height)
{
g_return_if_fail (GIMP_IS_PREVIEW (preview));
if (width)
*width = preview->width;
if (height)
*height = preview->height;
}
/**
* gimp_preview_get_position:
* @preview: a #GimpPreview widget
* @x: return location for the horizontal offset
* @y: return location for the vertical offset
*
* Since: 2.2
**/
void
gimp_preview_get_position (GimpPreview *preview,
gint *x,
gint *y)
{
g_return_if_fail (GIMP_IS_PREVIEW (preview));
if (x)
*x = preview->xoff + preview->xmin;
if (y)
*y = preview->yoff + preview->ymin;
}
/**
* gimp_preview_transform:
* @preview: a #GimpPreview widget
* @src_x: horizontal position on the previewed image
* @src_y: vertical position on the previewed image
* @dest_x: returns the transformed horizontal position
* @dest_y: returns the transformed vertical position
*
* Transforms from image to widget coordinates.
*
* Since: 2.4
**/
void
gimp_preview_transform (GimpPreview *preview,
gint src_x,
gint src_y,
gint *dest_x,
gint *dest_y)
{
g_return_if_fail (GIMP_IS_PREVIEW (preview));
g_return_if_fail (dest_x != NULL && dest_y != NULL);
GIMP_PREVIEW_GET_CLASS (preview)->transform (preview,
src_x, src_y, dest_x, dest_y);
}
/**
* gimp_preview_untransform:
* @preview: a #GimpPreview widget
* @src_x: horizontal position relative to the preview area's origin
* @src_y: vertical position relative to preview area's origin
* @dest_x: returns the untransformed horizontal position
* @dest_y: returns the untransformed vertical position
*
* Transforms from widget to image coordinates.
*
* Since: 2.4
**/
void
gimp_preview_untransform (GimpPreview *preview,
gint src_x,
gint src_y,
gint *dest_x,
gint *dest_y)
{
g_return_if_fail (GIMP_IS_PREVIEW (preview));
g_return_if_fail (dest_x != NULL && dest_y != NULL);
GIMP_PREVIEW_GET_CLASS (preview)->untransform (preview,
src_x, src_y, dest_x, dest_y);
}
/**
* gimp_preview_get_area:
* @preview: a #GimpPreview widget
*
* In most cases, you shouldn't need to access the #GimpPreviewArea
* that is being used in the @preview. Sometimes however, you need to.
* For example if you want to receive mouse events from the area. In
* such cases, use gimp_preview_get_area().
*
* Return value: a pointer to the #GimpPreviewArea used in the @preview.
*
* Since: 2.4
**/
GtkWidget *
gimp_preview_get_area (GimpPreview *preview)
{
g_return_val_if_fail (GIMP_IS_PREVIEW (preview), NULL);
return preview->area;
}
/**
* gimp_preview_draw:
* @preview: a #GimpPreview widget
*
* Calls the GimpPreview::draw method. GimpPreview itself doesn't
* implement a default draw method so the behaviour is determined by
* the derived class implementing this method.
*
* #GimpDrawablePreview implements gimp_preview_draw() by drawing the
* original, unmodified drawable to the @preview.
*
* Since: 2.2
**/
void
gimp_preview_draw (GimpPreview *preview)
{
GimpPreviewClass *class = GIMP_PREVIEW_GET_CLASS (preview);
if (class->draw)
class->draw (preview);
}
/**
* gimp_preview_draw_buffer:
* @preview: a #GimpPreview widget
* @buffer: a pixel buffer the size of the preview
* @rowstride: the @buffer's rowstride
*
* Calls the GimpPreview::draw_buffer method. GimpPreview itself
* doesn't implement this method so the behaviour is determined by the
* derived class implementing this method.
*
* Since: 2.2
**/
void
gimp_preview_draw_buffer (GimpPreview *preview,
const guchar *buffer,
gint rowstride)
{
GimpPreviewClass *class = GIMP_PREVIEW_GET_CLASS (preview);
if (class->draw_buffer)
class->draw_buffer (preview, buffer, rowstride);
}
/**
* gimp_preview_invalidate:
* @preview: a #GimpPreview widget
*
* This function starts or renews a short low-priority timeout. When
* the timeout expires, the GimpPreview::invalidated signal is emitted
* which will usually cause the @preview to be updated.
*
* This function does nothing unless the "Preview" button is checked.
*
* During the emission of the signal a busy cursor is set on the
* toplevel window containing the @preview and on the preview area
* itself.
*
* Since: 2.2
**/
void
gimp_preview_invalidate (GimpPreview *preview)
{
g_return_if_fail (GIMP_IS_PREVIEW (preview));
if (preview->update_preview)
{
if (preview->timeout_id)
g_source_remove (preview->timeout_id);
preview->timeout_id =
g_timeout_add_full (G_PRIORITY_DEFAULT_IDLE, PREVIEW_TIMEOUT,
(GSourceFunc) gimp_preview_invalidate_now,
preview, NULL);
}
}
/**
* gimp_preview_set_default_cursor:
* @preview: a #GimpPreview widget
* @cursor: a #GdkCursor or %NULL
*
* Sets the default mouse cursor for the preview. Note that this will
* be overridden by a %GDK_FLEUR if the preview has scrollbars, or by a
* %GDK_WATCH when the preview is invalidated.
*
* Since: 2.2
**/
void
gimp_preview_set_default_cursor (GimpPreview *preview,
GdkCursor *cursor)
{
g_return_if_fail (GIMP_IS_PREVIEW (preview));
g_set_object (&preview->default_cursor, cursor);
}
/**
* gimp_preview_get_controls:
* @preview: a #GimpPreview widget
*
* Gives access to the #GtkHBox at the bottom of the preview that
* contains the update toggle. Derived widgets can use this function
* if they need to add controls to this area.
*
* Return value: the #GtkHBox at the bottom of the preview.
*
* Since: 2.4
**/
GtkWidget *
gimp_preview_get_controls (GimpPreview *preview)
{
g_return_val_if_fail (GIMP_IS_PREVIEW (preview), NULL);
return GIMP_PREVIEW_GET_PRIVATE (preview)->controls;
}