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gimp/app/core/gimpviewable.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
*
* gimpviewable.h
* Copyright (C) 2001 Michael Natterer <mitch@gimp.org>
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <glib-object.h>
#include "core-types.h"
#include "base/temp-buf.h"
#include "gimpmarshal.h"
#include "gimpviewable.h"
enum
{
INVALIDATE_PREVIEW,
SIZE_CHANGED,
LAST_SIGNAL
};
static void gimp_viewable_class_init (GimpViewableClass *klass);
static void gimp_viewable_init (GimpViewable *viewable);
static gsize gimp_viewable_get_memsize (GimpObject *object);
static void gimp_viewable_real_invalidate_preview (GimpViewable *viewable);
static guint viewable_signals[LAST_SIGNAL] = { 0 };
static GimpObjectClass *parent_class = NULL;
GType
gimp_viewable_get_type (void)
{
static GType viewable_type = 0;
if (! viewable_type)
{
static const GTypeInfo viewable_info =
{
sizeof (GimpViewableClass),
NULL, /* base_init */
NULL, /* base_finalize */
(GClassInitFunc) gimp_viewable_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GimpViewable),
0, /* n_preallocs */
(GInstanceInitFunc) gimp_viewable_init,
};
viewable_type = g_type_register_static (GIMP_TYPE_OBJECT,
"GimpViewable",
&viewable_info, 0);
}
return viewable_type;
}
static void
gimp_viewable_class_init (GimpViewableClass *klass)
{
GimpObjectClass *gimp_object_class;
gimp_object_class = GIMP_OBJECT_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
viewable_signals[INVALIDATE_PREVIEW] =
g_signal_new ("invalidate_preview",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpViewableClass, invalidate_preview),
NULL, NULL,
gimp_marshal_VOID__VOID,
G_TYPE_NONE, 0);
viewable_signals[SIZE_CHANGED] =
g_signal_new ("size_changed",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpViewableClass, size_changed),
NULL, NULL,
gimp_marshal_VOID__VOID,
G_TYPE_NONE, 0);
gimp_object_class->get_memsize = gimp_viewable_get_memsize;
klass->invalidate_preview = gimp_viewable_real_invalidate_preview;
klass->size_changed = NULL;
klass->get_preview = NULL;
klass->get_new_preview = NULL;
}
static void
gimp_viewable_init (GimpViewable *viewable)
{
}
static gsize
gimp_viewable_get_memsize (GimpObject *object)
{
TempBuf *temp_buf;
GdkPixbuf *pixbuf;
gsize memsize = 0;
temp_buf = g_object_get_data (G_OBJECT (object),
"static-viewable-preview");
pixbuf = g_object_get_data (G_OBJECT (object),
"static-viewable-preview-pixbuf");
if (temp_buf)
{
memsize += temp_buf_get_memsize (temp_buf);
}
if (pixbuf)
{
static gsize pixbuf_instance_size = 0;
if (! pixbuf_instance_size)
{
GTypeQuery type_query;
g_type_query (G_TYPE_FROM_INSTANCE (pixbuf), &type_query);
pixbuf_instance_size = type_query.instance_size;
}
memsize += (pixbuf_instance_size +
gdk_pixbuf_get_height (pixbuf) *
gdk_pixbuf_get_rowstride (pixbuf));
}
return memsize + GIMP_OBJECT_CLASS (parent_class)->get_memsize (object);
}
void
gimp_viewable_invalidate_preview (GimpViewable *viewable)
{
g_return_if_fail (GIMP_IS_VIEWABLE (viewable));
g_signal_emit (G_OBJECT (viewable), viewable_signals[INVALIDATE_PREVIEW], 0);
}
void
gimp_viewable_size_changed (GimpViewable *viewable)
{
g_return_if_fail (GIMP_IS_VIEWABLE (viewable));
g_signal_emit (G_OBJECT (viewable), viewable_signals[SIZE_CHANGED], 0);
}
static void
gimp_viewable_real_invalidate_preview (GimpViewable *viewable)
{
g_return_if_fail (GIMP_IS_VIEWABLE (viewable));
g_object_set_data (G_OBJECT (viewable), "static-viewable-preview", NULL);
}
TempBuf *
gimp_viewable_get_preview (GimpViewable *viewable,
gint width,
gint height)
{
GimpViewableClass *viewable_class;
TempBuf *temp_buf = NULL;
g_return_val_if_fail (GIMP_IS_VIEWABLE (viewable), NULL);
g_return_val_if_fail (width > 0, NULL);
g_return_val_if_fail (height > 0, NULL);
viewable_class = GIMP_VIEWABLE_GET_CLASS (viewable);
if (viewable_class->get_preview)
temp_buf = viewable_class->get_preview (viewable, width, height);
if (temp_buf)
return temp_buf;
temp_buf = g_object_get_data (G_OBJECT (viewable),
"static-viewable-preview");
if (temp_buf &&
temp_buf->width == width &&
temp_buf->height == height)
return temp_buf;
temp_buf = NULL;
if (viewable_class->get_new_preview)
temp_buf = viewable_class->get_new_preview (viewable, width, height);
g_object_set_data_full (G_OBJECT (viewable), "static-viewable-preview",
temp_buf,
(GDestroyNotify) temp_buf_free);
return temp_buf;
}
TempBuf *
gimp_viewable_get_new_preview (GimpViewable *viewable,
gint width,
gint height)
{
GimpViewableClass *viewable_class;
TempBuf *temp_buf = NULL;
g_return_val_if_fail (GIMP_IS_VIEWABLE (viewable), NULL);
g_return_val_if_fail (width > 0, NULL);
g_return_val_if_fail (height > 0, NULL);
viewable_class = GIMP_VIEWABLE_GET_CLASS (viewable);
if (viewable_class->get_new_preview)
temp_buf = viewable_class->get_new_preview (viewable, width, height);
if (temp_buf)
return temp_buf;
if (viewable_class->get_preview)
temp_buf = viewable_class->get_preview (viewable, width, height);
if (temp_buf)
return temp_buf_copy (temp_buf, NULL);
return NULL;
}
GdkPixbuf *
gimp_viewable_get_preview_pixbuf (GimpViewable *viewable,
gint width,
gint height)
{
GdkPixbuf *pixbuf;
g_return_val_if_fail (GIMP_IS_VIEWABLE (viewable), NULL);
g_return_val_if_fail (width > 0, NULL);
g_return_val_if_fail (height > 0, NULL);
pixbuf = g_object_get_data (G_OBJECT (viewable),
"static-viewable-preview-pixbuf");
if (pixbuf &&
gdk_pixbuf_get_width (pixbuf) == width &&
gdk_pixbuf_get_height (pixbuf) == height)
{
return pixbuf;
}
pixbuf = gimp_viewable_get_new_preview_pixbuf (viewable, width, height);
g_object_set_data_full (G_OBJECT (viewable), "static-viewable-preview-pixbuf",
pixbuf,
(GDestroyNotify) g_object_unref);
return pixbuf;
}
GdkPixbuf *
gimp_viewable_get_new_preview_pixbuf (GimpViewable *viewable,
gint width,
gint height)
{
TempBuf *temp_buf;
GdkPixbuf *pixbuf = NULL;
g_return_val_if_fail (GIMP_IS_VIEWABLE (viewable), NULL);
g_return_val_if_fail (width > 0, NULL);
g_return_val_if_fail (height > 0, NULL);
temp_buf = gimp_viewable_get_preview (viewable, width, height);
if (temp_buf)
{
gint width;
gint height;
gint bytes;
bytes = temp_buf->bytes;
width = temp_buf->width;
height = temp_buf->height;
pixbuf = gdk_pixbuf_new_from_data (temp_buf_data (temp_buf),
GDK_COLORSPACE_RGB,
(bytes == 2) || (bytes == 4),
8,
width,
height,
width * bytes,
NULL, NULL);
}
return pixbuf;
}
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