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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.c
* 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 <string.h>
#include <glib-object.h>
#include "libgimpconfig/gimpconfig.h"
#include "core-types.h"
#include "base/temp-buf.h"
#include "gimp-utils.h"
#include "gimpmarshal.h"
#include "gimpviewable.h"
#include "themes/Default/images/gimp-core-pixbufs.h"
enum
{
PROP_0,
PROP_STOCK_ID
};
enum
{
INVALIDATE_PREVIEW,
SIZE_CHANGED,
LAST_SIGNAL
};
static void gimp_viewable_config_iface_init (GimpConfigInterface *iface);
static void gimp_viewable_finalize (GObject *object);
static void gimp_viewable_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void gimp_viewable_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static gint64 gimp_viewable_get_memsize (GimpObject *object,
gint64 *gui_size);
static void gimp_viewable_real_invalidate_preview (GimpViewable *viewable);
static GdkPixbuf * gimp_viewable_real_get_new_pixbuf (GimpViewable *viewable,
gint width,
gint height);
static void gimp_viewable_real_get_preview_size (GimpViewable *viewable,
gint size,
gboolean popup,
gboolean dot_for_dot,
gint *width,
gint *height);
static gboolean gimp_viewable_real_get_popup_size (GimpViewable *viewable,
gint width,
gint height,
gboolean dot_for_dot,
gint *popup_width,
gint *popup_height);
static gchar * gimp_viewable_real_get_description (GimpViewable *viewable,
gchar **tooltip);
static gboolean gimp_viewable_serialize_property (GimpConfig *config,
guint property_id,
const GValue *value,
GParamSpec *pspec,
GimpConfigWriter *writer);
G_DEFINE_TYPE_WITH_CODE (GimpViewable, gimp_viewable, GIMP_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (GIMP_TYPE_CONFIG,
gimp_viewable_config_iface_init))
#define parent_class gimp_viewable_parent_class
static guint viewable_signals[LAST_SIGNAL] = { 0 };
static GQuark quark_preview_temp_buf = 0;
static GQuark quark_preview_pixbuf = 0;
static void
gimp_viewable_class_init (GimpViewableClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GimpObjectClass *gimp_object_class = GIMP_OBJECT_CLASS (klass);
quark_preview_temp_buf = g_quark_from_static_string ("viewable-preview-temp-buf");
quark_preview_pixbuf = g_quark_from_static_string ("viewable-preview-pixbuf");
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);
object_class->finalize = gimp_viewable_finalize;
object_class->get_property = gimp_viewable_get_property;
object_class->set_property = gimp_viewable_set_property;
gimp_object_class->get_memsize = gimp_viewable_get_memsize;
klass->default_stock_id = "gimp-question";
klass->name_changed_signal = "name-changed";
klass->invalidate_preview = gimp_viewable_real_invalidate_preview;
klass->size_changed = NULL;
klass->get_size = NULL;
klass->get_preview_size = gimp_viewable_real_get_preview_size;
klass->get_popup_size = gimp_viewable_real_get_popup_size;
klass->get_preview = NULL;
klass->get_new_preview = NULL;
klass->get_pixbuf = NULL;
klass->get_new_pixbuf = gimp_viewable_real_get_new_pixbuf;
klass->get_description = gimp_viewable_real_get_description;
GIMP_CONFIG_INSTALL_PROP_STRING (object_class, PROP_STOCK_ID, "stock-id",
NULL, NULL,
GIMP_PARAM_STATIC_STRINGS);
}
static void
gimp_viewable_init (GimpViewable *viewable)
{
viewable->stock_id = NULL;
}
static void
gimp_viewable_config_iface_init (GimpConfigInterface *iface)
{
iface->serialize_property = gimp_viewable_serialize_property;
}
static void
gimp_viewable_finalize (GObject *object)
{
GimpViewable *viewable = GIMP_VIEWABLE (object);
if (viewable->stock_id)
{
g_free (viewable->stock_id);
viewable->stock_id = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gimp_viewable_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
switch (property_id)
{
case PROP_STOCK_ID:
gimp_viewable_set_stock_id (GIMP_VIEWABLE (object),
g_value_get_string (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_viewable_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
switch (property_id)
{
case PROP_STOCK_ID:
g_value_set_string (value,
gimp_viewable_get_stock_id (GIMP_VIEWABLE (object)));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static gint64
gimp_viewable_get_memsize (GimpObject *object,
gint64 *gui_size)
{
TempBuf *temp_buf;
GdkPixbuf *pixbuf;
temp_buf = g_object_get_qdata (G_OBJECT (object), quark_preview_temp_buf);
pixbuf = g_object_get_qdata (G_OBJECT (object), quark_preview_pixbuf);
if (temp_buf)
*gui_size += 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;
}
*gui_size += (pixbuf_instance_size +
(gsize) gdk_pixbuf_get_height (pixbuf) *
gdk_pixbuf_get_rowstride (pixbuf));
}
return GIMP_OBJECT_CLASS (parent_class)->get_memsize (object, gui_size);
}
static void
gimp_viewable_real_invalidate_preview (GimpViewable *viewable)
{
g_object_set_qdata (G_OBJECT (viewable), quark_preview_temp_buf, NULL);
g_object_set_qdata (G_OBJECT (viewable), quark_preview_pixbuf, NULL);
}
static void
gimp_viewable_real_get_preview_size (GimpViewable *viewable,
gint size,
gboolean popup,
gboolean dot_for_dot,
gint *width,
gint *height)
{
*width = size;
*height = size;
}
static gboolean
gimp_viewable_real_get_popup_size (GimpViewable *viewable,
gint width,
gint height,
gboolean dot_for_dot,
gint *popup_width,
gint *popup_height)
{
gint w, h;
if (gimp_viewable_get_size (viewable, &w, &h))
{
if (w > width || h > height)
{
*popup_width = w;
*popup_height = h;
return TRUE;
}
}
return FALSE;
}
static GdkPixbuf *
gimp_viewable_real_get_new_pixbuf (GimpViewable *viewable,
gint width,
gint height)
{
TempBuf *temp_buf;
GdkPixbuf *pixbuf = NULL;
temp_buf = gimp_viewable_get_preview (viewable, width, height);
if (temp_buf)
{
TempBuf *color_buf = NULL;
gint width;
gint height;
gint bytes;
bytes = temp_buf->bytes;
width = temp_buf->width;
height = temp_buf->height;
if (bytes == 1 || bytes == 2)
{
gint color_bytes;
color_bytes = (bytes == 2) ? 4 : 3;
color_buf = temp_buf_new (width, height, color_bytes, 0, 0, NULL);
temp_buf_copy (temp_buf, color_buf);
temp_buf = color_buf;
bytes = color_bytes;
}
pixbuf = gdk_pixbuf_new_from_data (g_memdup (temp_buf_data (temp_buf),
width * height * bytes),
GDK_COLORSPACE_RGB,
(bytes == 4),
8,
width,
height,
width * bytes,
(GdkPixbufDestroyNotify) g_free,
NULL);
if (color_buf)
temp_buf_free (color_buf);
}
return pixbuf;
}
static gchar *
gimp_viewable_real_get_description (GimpViewable *viewable,
gchar **tooltip)
{
return g_strdup (gimp_object_get_name (GIMP_OBJECT (viewable)));
}
static gboolean
gimp_viewable_serialize_property (GimpConfig *config,
guint property_id,
const GValue *value,
GParamSpec *pspec,
GimpConfigWriter *writer)
{
GimpViewable *viewable = GIMP_VIEWABLE (config);
switch (property_id)
{
case PROP_STOCK_ID:
if (viewable->stock_id)
{
gimp_config_writer_open (writer, pspec->name);
gimp_config_writer_string (writer, viewable->stock_id);
gimp_config_writer_close (writer);
}
return TRUE;
default:
break;
}
return FALSE;
}
/**
* gimp_viewable_invalidate_preview:
* @viewable: a viewable object
*
* Causes any cached preview to be marked as invalid, so that a new
* preview will be generated at the next attempt to display one.
**/
void
gimp_viewable_invalidate_preview (GimpViewable *viewable)
{
g_return_if_fail (GIMP_IS_VIEWABLE (viewable));
g_signal_emit (viewable, viewable_signals[INVALIDATE_PREVIEW], 0);
}
/**
* gimp_viewable_size_changed:
* @viewable: a viewable object
*
* This function sends a signal that is handled at a lower level in the
* object hierarchy, and provides a mechanism by which objects derived
* from #GimpViewable can respond to size changes.
**/
void
gimp_viewable_size_changed (GimpViewable *viewable)
{
g_return_if_fail (GIMP_IS_VIEWABLE (viewable));
g_signal_emit (viewable, viewable_signals[SIZE_CHANGED], 0);
}
/**
* gimp_viewable_calc_preview_size:
* @aspect_width: unscaled width of the preview for an item.
* @aspect_height: unscaled height of the preview for an item.
* @width: maximum available width for scaled preview.
* @height: maximum available height for scaled preview.
* @dot_for_dot: if #TRUE, ignore any differences in axis resolution.
* @xresolution: resolution in the horizontal direction.
* @yresolution: resolution in the vertical direction.
* @return_width: place to return the calculated preview width.
* @return_height: place to return the calculated preview height.
* @scaling_up: returns #TRUE here if the calculated preview size
* is larger than the viewable itself.
*
* A utility function, for calculating the dimensions of a preview
* based on the information specified in the arguments. The arguments
* @aspect_width and @aspect_height are the dimensions of the unscaled
* preview. The arguments @width and @height represent the maximum
* width and height that the scaled preview must fit into. The
* preview is scaled to be as large as possible without exceeding
* these constraints.
*
* If @dot_for_dot is #TRUE, and @xresolution and @yresolution are
* different, then these results are corrected for the difference in
* resolution on the two axes, so that the requested aspect ratio
* applies to the appearance of the display rather than to pixel
* counts.
**/
void
gimp_viewable_calc_preview_size (gint aspect_width,
gint aspect_height,
gint width,
gint height,
gboolean dot_for_dot,
gdouble xresolution,
gdouble yresolution,
gint *return_width,
gint *return_height,
gboolean *scaling_up)
{
gdouble xratio;
gdouble yratio;
if (aspect_width > aspect_height)
{
xratio = yratio = (gdouble) width / (gdouble) aspect_width;
}
else
{
xratio = yratio = (gdouble) height / (gdouble) aspect_height;
}
if (! dot_for_dot && xresolution != yresolution)
{
yratio *= xresolution / yresolution;
}
width = RINT (xratio * (gdouble) aspect_width);
height = RINT (yratio * (gdouble) aspect_height);
if (width < 1) width = 1;
if (height < 1) height = 1;
if (return_width) *return_width = width;
if (return_height) *return_height = height;
if (scaling_up) *scaling_up = (xratio > 1.0) || (yratio > 1.0);
}
gboolean
gimp_viewable_get_size (GimpViewable *viewable,
gint *width,
gint *height)
{
GimpViewableClass *viewable_class;
gboolean retval = FALSE;
gint w = 0;
gint h = 0;
g_return_val_if_fail (GIMP_IS_VIEWABLE (viewable), FALSE);
viewable_class = GIMP_VIEWABLE_GET_CLASS (viewable);
if (viewable_class->get_size)
retval = viewable_class->get_size (viewable, &w, &h);
if (width) *width = w;
if (height) *height = h;
return retval;
}
/**
* gimp_viewable_get_preview_size:
* @viewable: the object for which to calculate the preview size.
* @size: requested size for preview.
* @popup: %TRUE if the preview is intended for a popup window.
* @dot_for_dot: If #TRUE, ignore any differences in X and Y resolution.
* @width: return location for the the calculated width.
* @height: return location for the calculated height.
*
* Retrieve the size of a viewable's preview. By default, this
* simply returns the value of the @size argument for both the @width
* and @height, but this can be overridden in objects derived from
* #GimpViewable. If either the width or height exceeds
* #GIMP_VIEWABLE_MAX_PREVIEW_SIZE, they are silently truncated.
**/
void
gimp_viewable_get_preview_size (GimpViewable *viewable,
gint size,
gboolean popup,
gboolean dot_for_dot,
gint *width,
gint *height)
{
gint w, h;
g_return_if_fail (GIMP_IS_VIEWABLE (viewable));
g_return_if_fail (size > 0);
GIMP_VIEWABLE_GET_CLASS (viewable)->get_preview_size (viewable, size,
popup, dot_for_dot,
&w, &h);
w = MIN (w, GIMP_VIEWABLE_MAX_PREVIEW_SIZE);
h = MIN (h, GIMP_VIEWABLE_MAX_PREVIEW_SIZE);
if (width) *width = w;
if (height) *height = h;
}
/**
* gimp_viewable_get_popup_size:
* @viewable: the object for which to calculate the popup size.
* @width: the width of the preview from which the popup will be shown.
* @height: the height of the preview from which the popup will be shown.
* @dot_for_dot: If #TRUE, ignore any differences in X and Y resolution.
* @popup_width: return location for the calculated popup width.
* @popup_height: return location for the calculated popup height.
*
* Calculate the size of a viewable's preview, for use in making a
* popup. The arguments @width and @height specify the size of the
* preview from which the popup will be shown.
*
* Returns: Whether the viewable wants a popup to be shown. Usually
* %TRUE if the passed preview size is smaller than the viewable
* size, and %FALSE if the viewable completely fits into the
* original preview.
**/
gboolean
gimp_viewable_get_popup_size (GimpViewable *viewable,
gint width,
gint height,
gboolean dot_for_dot,
gint *popup_width,
gint *popup_height)
{
gint w, h;
g_return_val_if_fail (GIMP_IS_VIEWABLE (viewable), FALSE);
if (GIMP_VIEWABLE_GET_CLASS (viewable)->get_popup_size (viewable,
width, height,
dot_for_dot,
&w, &h))
{
if (w < 1) w = 1;
if (h < 1) h = 1;
/* limit the popup to 2 * GIMP_VIEWABLE_MAX_POPUP_SIZE
* on each axis.
*/
if ((w > (2 * GIMP_VIEWABLE_MAX_POPUP_SIZE)) ||
(h > (2 * GIMP_VIEWABLE_MAX_POPUP_SIZE)))
{
gimp_viewable_calc_preview_size (w, h,
2 * GIMP_VIEWABLE_MAX_POPUP_SIZE,
2 * GIMP_VIEWABLE_MAX_POPUP_SIZE,
dot_for_dot, 1.0, 1.0,
&w, &h, NULL);
}
/* limit the number of pixels to
* GIMP_VIEWABLE_MAX_POPUP_SIZE ^ 2
*/
if ((w * h) > SQR (GIMP_VIEWABLE_MAX_POPUP_SIZE))
{
gdouble factor;
factor = sqrt (((gdouble) (w * h) /
(gdouble) SQR (GIMP_VIEWABLE_MAX_POPUP_SIZE)));
w = RINT ((gdouble) w / factor);
h = RINT ((gdouble) h / factor);
}
if (w < 1) w = 1;
if (h < 1) h = 1;
if (popup_width) *popup_width = w;
if (popup_height) *popup_height = h;
return TRUE;
}
return FALSE;
}
/**
* gimp_viewable_get_preview:
* @viewable: The viewable object to get a preview for.
* @width: desired width for the preview
* @height: desired height for the preview
*
* Gets a preview for a viewable object, by running through a variety
* of methods until it finds one that works. First, if an
* implementation exists of a "get_preview" method, it is tried, and
* the result is returned if it is not #NULL. Second, the function
* checks to see whether there is a cached preview with the correct
* dimensions; if so, it is returned. If neither of these works, then
* the function looks for an implementation of the "get_new_preview"
* method, and executes it, caching the result. If everything fails,
* #NULL is returned.
*
* Returns: A #TempBuf containg the preview image, or #NULL if none can
* be found or created.
**/
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_qdata (G_OBJECT (viewable), quark_preview_temp_buf);
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_qdata_full (G_OBJECT (viewable), quark_preview_temp_buf,
temp_buf,
(GDestroyNotify) temp_buf_free);
return temp_buf;
}
/**
* gimp_viewable_get_new_preview:
* @viewable: The viewable object to get a preview for.
* @width: desired width for the preview
* @height: desired height for the preview
*
* Gets a new preview for a viewable object. Similar to
* gimp_viewable_get_preview(), except that it tries things in a
* different order, first looking for a "get_new_preview" method, and
* then if that fails for a "get_preview" method. This function does
* not look for a cached preview.
*
* Returns: A #TempBuf containg the preview image, or #NULL if none can
* be found or created.
**/
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;
}
/**
* gimp_viewable_get_dummy_preview:
* @viewable: viewable object for which to get a dummy preview.
* @width: width of the preview.
* @height: height of the preview.
* @bpp: bytes per pixel for the preview, must be 3 or 4.
*
* Creates a dummy preview the fits into the specified dimensions,
* containing a default "question" symbol. This function is used to
* generate a preview in situations where layer previews have been
* disabled in the current Gimp configuration.
*
* Returns: a #TempBuf containing the preview image.
**/
TempBuf *
gimp_viewable_get_dummy_preview (GimpViewable *viewable,
gint width,
gint height,
gint bpp)
{
GdkPixbuf *pixbuf;
TempBuf *buf;
guchar *src;
guchar *dest;
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);
g_return_val_if_fail (bpp == 3 || bpp == 4, NULL);
pixbuf = gimp_viewable_get_dummy_pixbuf (viewable, width, height, bpp);
buf = temp_buf_new (width, height, bpp, 0, 0, NULL);
src = gdk_pixbuf_get_pixels (pixbuf);
dest = temp_buf_data (buf);
while (height--)
{
memcpy (dest, src, width * bpp);
src += gdk_pixbuf_get_rowstride (pixbuf);
dest += width * bpp;
}
g_object_unref (pixbuf);
return buf;
}
/**
* gimp_viewable_get_pixbuf:
* @viewable: The viewable object to get a pixbuf preview for.
* @width: desired width for the preview
* @height: desired height for the preview
*
* Gets a preview for a viewable object, by running through a variety
* of methods until it finds one that works. First, if an
* implementation exists of a "get_pixbuf" method, it is tried, and
* the result is returned if it is not #NULL. Second, the function
* checks to see whether there is a cached preview with the correct
* dimensions; if so, it is returned. If neither of these works, then
* the function looks for an implementation of the "get_new_pixbuf"
* method, and executes it, caching the result. If everything fails,
* #NULL is returned.
*
* Returns: A #GdkPixbuf containing the preview pixbuf, or #NULL if none can
* be found or created.
**/
GdkPixbuf *
gimp_viewable_get_pixbuf (GimpViewable *viewable,
gint width,
gint height)
{
GimpViewableClass *viewable_class;
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);
viewable_class = GIMP_VIEWABLE_GET_CLASS (viewable);
if (viewable_class->get_pixbuf)
pixbuf = viewable_class->get_pixbuf (viewable, width, height);
if (pixbuf)
return pixbuf;
pixbuf = g_object_get_qdata (G_OBJECT (viewable), quark_preview_pixbuf);
if (pixbuf &&
gdk_pixbuf_get_width (pixbuf) == width &&
gdk_pixbuf_get_height (pixbuf) == height)
return pixbuf;
pixbuf = NULL;
if (viewable_class->get_new_pixbuf)
pixbuf = viewable_class->get_new_pixbuf (viewable, width, height);
g_object_set_qdata_full (G_OBJECT (viewable), quark_preview_pixbuf,
pixbuf,
(GDestroyNotify) g_object_unref);
return pixbuf;
}
/**
* gimp_viewable_get_new_pixbuf:
* @viewable: The viewable object to get a new pixbuf preview for.
* @width: desired width for the pixbuf
* @height: desired height for the pixbuf
*
* Gets a new preview for a viewable object. Similar to
* gimp_viewable_get_pixbuf(), except that it tries things in a
* different order, first looking for a "get_new_pixbuf" method, and
* then if that fails for a "get_pixbuf" method. This function does
* not look for a cached pixbuf.
*
* Returns: A #GdkPixbuf containing the preview, or #NULL if none can
* be created.
**/
GdkPixbuf *
gimp_viewable_get_new_pixbuf (GimpViewable *viewable,
gint width,
gint height)
{
GimpViewableClass *viewable_class;
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);
viewable_class = GIMP_VIEWABLE_GET_CLASS (viewable);
if (viewable_class->get_new_pixbuf)
pixbuf = viewable_class->get_new_pixbuf (viewable, width, height);
if (pixbuf)
return pixbuf;
if (viewable_class->get_pixbuf)
pixbuf = viewable_class->get_pixbuf (viewable, width, height);
if (pixbuf)
return gdk_pixbuf_copy (pixbuf);
return NULL;
}
/**
* gimp_viewable_get_dummy_pixbuf:
* @viewable: the viewable object for which to create a dummy representation.
* @width: maximum permitted width for the pixbuf.
* @height: maximum permitted height for the pixbuf.
* @bpp: bytes per pixel for the pixbuf, must equal 3 or 4.
*
* Creates a pixbuf containing a default "question" symbol, sized to
* fit into the specified dimensions. The depth of the pixbuf must be
* 3 or 4 because #GdkPixbuf does not support grayscale. This
* function is used to generate a preview in situations where
* previewing has been disabled in the current Gimp configuration.
* [Note: this function is currently unused except internally to
* #GimpViewable -- consider making it static?]
*
* Returns: the created #GdkPixbuf.
**/
GdkPixbuf *
gimp_viewable_get_dummy_pixbuf (GimpViewable *viewable,
gint width,
gint height,
gint bpp)
{
GdkPixbuf *icon;
GdkPixbuf *pixbuf;
gdouble ratio;
gint w, h;
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);
g_return_val_if_fail (bpp == 3 || bpp == 4, NULL);
icon = gdk_pixbuf_new_from_inline (-1, stock_question_64, FALSE, NULL);
g_return_val_if_fail (icon != NULL, NULL);
w = gdk_pixbuf_get_width (icon);
h = gdk_pixbuf_get_height (icon);
ratio = (gdouble) MIN (width, height) / (gdouble) MAX (w, h);
ratio = MIN (ratio, 1.0);
w = RINT (ratio * (gdouble) w);
h = RINT (ratio * (gdouble) h);
pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, (bpp == 4), 8, width, height);
gdk_pixbuf_fill (pixbuf, 0xffffffff);
if (w && h)
gdk_pixbuf_composite (icon, pixbuf,
(width - w) / 2, (height - h) / 2, w, h,
(width - w) / 2, (height - h) / 2, ratio, ratio,
GDK_INTERP_BILINEAR, 0xFF);
g_object_unref (icon);
return pixbuf;
}
/**
* gimp_viewable_get_description:
* @viewable: viewable object for which to retrieve a description.
* @tooltip: return loaction for an optional tooltip string.
*
* Retrieves a string containing a description of the viewable object,
* By default, it simply returns the name of the object, but this can
* be overridden by object types that inherit from #GimpViewable.
*
* Returns: a copy of the description string. This should be freed
* when it is no longer needed.
**/
gchar *
gimp_viewable_get_description (GimpViewable *viewable,
gchar **tooltip)
{
g_return_val_if_fail (GIMP_IS_VIEWABLE (viewable), NULL);
if (tooltip)
*tooltip = NULL;
return GIMP_VIEWABLE_GET_CLASS (viewable)->get_description (viewable,
tooltip);
}
/**
* gimp_viewable_get_stock_id:
* @viewable: viewable object for which to retrieve a stock ID.
*
* Gets the current value of the object's stock ID, for use in
* constructing an iconic representation of the object.
*
* Returns: a pointer to the string containing the stock ID. The
* contents must not be altered or freed.
**/
const gchar *
gimp_viewable_get_stock_id (GimpViewable *viewable)
{
g_return_val_if_fail (GIMP_IS_VIEWABLE (viewable), NULL);
if (viewable->stock_id)
return (const gchar *) viewable->stock_id;
return GIMP_VIEWABLE_GET_CLASS (viewable)->default_stock_id;
}
/**
* gimp_viewable_set_stock_id:
* @viewable: viewable object to assign the specified stock ID.
* @stock_id: string containing a stock identifier.
*
* Seta the object's stock ID, for use in constructing iconic smbols
* of the object. The contents of @stock_id are copied, so you can
* free it when you are done with it.
**/
void
gimp_viewable_set_stock_id (GimpViewable *viewable,
const gchar *stock_id)
{
GimpViewableClass *viewable_class;
g_return_if_fail (GIMP_IS_VIEWABLE (viewable));
g_free (viewable->stock_id);
viewable->stock_id = NULL;
viewable_class = GIMP_VIEWABLE_GET_CLASS (viewable);
if (stock_id)
{
if (viewable_class->default_stock_id == NULL ||
strcmp (stock_id, viewable_class->default_stock_id))
viewable->stock_id = g_strdup (stock_id);
}
g_object_notify (G_OBJECT (viewable), "stock-id");
}
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