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gimp/libgimp/gimpzoompreview.c

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/* LIBGIMP - The GIMP Library
* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
*
* gimpzoompreview.c
* Copyright (C) 2005 David Odin <dindinx@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 2 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, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <gtk/gtk.h>
#include "libgimpwidgets/gimpwidgets.h"
#include "gimpuitypes.h"
#include "gimp.h"
#include "gimpdrawablepreview.h"
#include "gimpzoompreview.h"
enum
{
PROP_0,
PROP_DRAWABLE,
PROP_MODEL
};
typedef struct GimpZoomPreviewPrivate
{
GimpDrawable *drawable;
GimpZoomModel *model;
GdkRectangle extents;
} GimpZoomPreviewPrivate;
typedef struct
{
gboolean update;
} PreviewSettings;
#define GIMP_ZOOM_PREVIEW_GET_PRIVATE(obj) \
((GimpZoomPreviewPrivate *) ((GimpZoomPreview *) (obj))->priv)
static GObject * gimp_zoom_preview_constructor (GType type,
guint n_params,
GObjectConstructParam *params);
static void gimp_zoom_preview_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void gimp_zoom_preview_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void gimp_zoom_preview_finalize (GObject *object);
static void gimp_zoom_preview_destroy (GtkObject *object);
static void gimp_zoom_preview_set_adjustments (GimpZoomPreview *preview,
gdouble old_factor,
gdouble new_factor);
static void gimp_zoom_preview_size_allocate (GtkWidget *widget,
GtkAllocation *allocation,
GimpZoomPreview *preview);
static void gimp_zoom_preview_style_set (GtkWidget *widget,
GtkStyle *prev_style);
static gboolean gimp_zoom_preview_scroll_event (GtkWidget *widget,
GdkEventScroll *event,
GimpZoomPreview *preview);
static void gimp_zoom_preview_draw (GimpPreview *preview);
static void gimp_zoom_preview_draw_buffer (GimpPreview *preview,
const guchar *buffer,
gint rowstride);
static void gimp_zoom_preview_draw_thumb (GimpPreview *preview,
GimpPreviewArea *area,
gint width,
gint height);
static void gimp_zoom_preview_set_cursor (GimpPreview *preview);
static void gimp_zoom_preview_transform (GimpPreview *preview,
gint src_x,
gint src_y,
gint *dest_x,
gint *dest_y);
static void gimp_zoom_preview_untransform (GimpPreview *preview,
gint src_x,
gint src_y,
gint *dest_x,
gint *dest_y);
static void gimp_zoom_preview_set_drawable (GimpZoomPreview *preview,
GimpDrawable *drawable);
static void gimp_zoom_preview_set_model (GimpZoomPreview *preview,
GimpZoomModel *model);
static void gimp_zoom_preview_get_source_area (GimpPreview *preview,
gint *x,
gint *y,
gint *w,
gint *h);
G_DEFINE_TYPE (GimpZoomPreview, gimp_zoom_preview, GIMP_TYPE_SCROLLED_PREVIEW)
#define parent_class gimp_zoom_preview_parent_class
static gint gimp_zoom_preview_counter = 0;
static void
gimp_zoom_preview_class_init (GimpZoomPreviewClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkObjectClass *gtk_object_class = GTK_OBJECT_CLASS (klass);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
GimpPreviewClass *preview_class = GIMP_PREVIEW_CLASS (klass);
object_class->constructor = gimp_zoom_preview_constructor;
object_class->get_property = gimp_zoom_preview_get_property;
object_class->set_property = gimp_zoom_preview_set_property;
object_class->finalize = gimp_zoom_preview_finalize;
gtk_object_class->destroy = gimp_zoom_preview_destroy;
widget_class->style_set = gimp_zoom_preview_style_set;
preview_class->draw = gimp_zoom_preview_draw;
preview_class->draw_buffer = gimp_zoom_preview_draw_buffer;
preview_class->draw_thumb = gimp_zoom_preview_draw_thumb;
preview_class->set_cursor = gimp_zoom_preview_set_cursor;
preview_class->transform = gimp_zoom_preview_transform;
preview_class->untransform = gimp_zoom_preview_untransform;
g_type_class_add_private (object_class, sizeof (GimpZoomPreviewPrivate));
/**
* GimpZoomPreview:drawable:
*
* The drawable the #GimpZoomPreview is attached to.
*
* Since: GIMP 2.4
*/
g_object_class_install_property (object_class, PROP_DRAWABLE,
g_param_spec_pointer ("drawable", NULL, NULL,
GIMP_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY));
/**
* GimpZoomPreview:model:
*
* The #GimpZoomModel used by this #GimpZoomPreview.
*
* Since: GIMP 2.4
*/
g_object_class_install_property (object_class, PROP_MODEL,
g_param_spec_object ("model", NULL, NULL,
GIMP_TYPE_ZOOM_MODEL,
GIMP_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY));
}
static void
gimp_zoom_preview_init (GimpZoomPreview *preview)
{
preview->priv = G_TYPE_INSTANCE_GET_PRIVATE (preview,
GIMP_TYPE_ZOOM_PREVIEW,
GimpZoomPreviewPrivate);
g_signal_connect (GIMP_PREVIEW (preview)->area, "size-allocate",
G_CALLBACK (gimp_zoom_preview_size_allocate),
preview);
g_signal_connect (GIMP_PREVIEW (preview)->area, "scroll-event",
G_CALLBACK (gimp_zoom_preview_scroll_event),
preview);
g_object_set (GIMP_PREVIEW (preview)->area,
"check-size", gimp_check_size (),
"check-type", gimp_check_type (),
NULL);
gimp_scrolled_preview_set_policy (GIMP_SCROLLED_PREVIEW (preview),
GTK_POLICY_ALWAYS, GTK_POLICY_ALWAYS);
}
static GObject *
gimp_zoom_preview_constructor (GType type,
guint n_params,
GObjectConstructParam *params)
{
GimpZoomPreviewPrivate *priv;
GObject *object;
gchar *data_name;
PreviewSettings settings;
data_name = g_strdup_printf ("%s-zoom-preview-%d",
g_get_prgname (),
gimp_zoom_preview_counter++);
object = G_OBJECT_CLASS (parent_class)->constructor (type, n_params, params);
if (gimp_get_data (data_name, &settings))
{
gimp_preview_set_update (GIMP_PREVIEW (object), settings.update);
}
g_object_set_data_full (object, "gimp-zoom-preview-data-name",
data_name, (GDestroyNotify) g_free);
priv = GIMP_ZOOM_PREVIEW_GET_PRIVATE (object);
if (! priv->model)
{
GimpZoomModel *model = gimp_zoom_model_new ();
gimp_zoom_model_set_range (model, 1.0, 256.0);
gimp_zoom_preview_set_model (GIMP_ZOOM_PREVIEW (object), model);
g_object_unref (model);
}
gimp_zoom_preview_set_adjustments (GIMP_ZOOM_PREVIEW (object), 1.0, 1.0);
return object;
}
static void
gimp_zoom_preview_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GimpZoomPreview *preview = GIMP_ZOOM_PREVIEW (object);
switch (property_id)
{
case PROP_DRAWABLE:
g_value_set_pointer (value, gimp_zoom_preview_get_drawable (preview));
break;
case PROP_MODEL:
g_value_set_object (value, gimp_zoom_preview_get_model (preview));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_zoom_preview_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GimpZoomPreview *preview = GIMP_ZOOM_PREVIEW (object);
switch (property_id)
{
case PROP_DRAWABLE:
gimp_zoom_preview_set_drawable (preview, g_value_get_pointer (value));
break;
case PROP_MODEL:
gimp_zoom_preview_set_model (preview, g_value_get_object (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_zoom_preview_finalize (GObject *object)
{
GimpZoomPreviewPrivate *priv = GIMP_ZOOM_PREVIEW_GET_PRIVATE (object);
if (priv->model)
{
g_object_unref (priv->model);
priv->model = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gimp_zoom_preview_destroy (GtkObject *object)
{
const gchar *data_name = g_object_get_data (G_OBJECT (object),
"gimp-zoom-preview-data-name");
if (data_name)
{
GimpPreview *preview = GIMP_PREVIEW (object);
PreviewSettings settings;
settings.update = gimp_preview_get_update (preview);
gimp_set_data (data_name, &settings, sizeof (PreviewSettings));
}
GTK_OBJECT_CLASS (parent_class)->destroy (object);
}
static void
gimp_zoom_preview_set_adjustments (GimpZoomPreview *preview,
gdouble old_factor,
gdouble new_factor)
{
GimpScrolledPreview *scrolled_preview = GIMP_SCROLLED_PREVIEW (preview);
GtkAdjustment *adj;
gdouble width;
gdouble height;
gdouble ratio;
gimp_scrolled_preview_freeze (scrolled_preview);
width = GIMP_PREVIEW (preview)->width;
height = GIMP_PREVIEW (preview)->height;
ratio = new_factor / old_factor;
adj = gtk_range_get_adjustment (GTK_RANGE (scrolled_preview->hscr));
adj->lower = 0;
adj->page_size = width;
adj->upper = width * new_factor;
adj->step_increment = new_factor;
adj->page_increment = MAX (width / 2.0, adj->step_increment);
adj->value = CLAMP ((adj->value + width / 2.0) * ratio
- width / 2.0,
adj->lower, adj->upper - width);
gtk_adjustment_changed (adj);
gtk_adjustment_value_changed (adj);
adj = gtk_range_get_adjustment (GTK_RANGE (scrolled_preview->vscr));
adj->lower = 0;
adj->page_size = height;
adj->upper = height * new_factor;
adj->step_increment = new_factor;
adj->page_increment = MAX (height / 2.0, adj->step_increment);
adj->value = CLAMP ((adj->value + height / 2.0) * ratio
- height / 2.0,
adj->lower, adj->upper - height);
gtk_adjustment_changed (adj);
gtk_adjustment_value_changed (adj);
gimp_scrolled_preview_thaw (scrolled_preview);
}
static void
gimp_zoom_preview_size_allocate (GtkWidget *widget,
GtkAllocation *allocation,
GimpZoomPreview *preview)
{
GimpZoomPreviewPrivate *priv = GIMP_ZOOM_PREVIEW_GET_PRIVATE (preview);
gdouble zoom;
gint width = GIMP_PREVIEW (preview)->xmax - GIMP_PREVIEW (preview)->xmin;
gint height = GIMP_PREVIEW (preview)->ymax - GIMP_PREVIEW (preview)->ymin;
GIMP_PREVIEW (preview)->width = MIN (width, allocation->width);
GIMP_PREVIEW (preview)->height = MIN (height, allocation->height);
zoom = gimp_zoom_model_get_factor (priv->model);
gimp_zoom_preview_set_adjustments (preview, zoom, zoom);
}
static void
gimp_zoom_preview_style_set (GtkWidget *widget,
GtkStyle *prev_style)
{
GimpPreview *preview = GIMP_PREVIEW (widget);
GimpZoomPreviewPrivate *priv = GIMP_ZOOM_PREVIEW_GET_PRIVATE (preview);
GimpDrawable *drawable = priv->drawable;
gint size;
gint width, height;
gint x1, y1;
gint x2, y2;
if (GTK_WIDGET_CLASS (parent_class)->style_set)
GTK_WIDGET_CLASS (parent_class)->style_set (widget, prev_style);
gtk_widget_style_get (widget, "size", &size, NULL);
if (_gimp_drawable_preview_get_bounds (drawable, &x1, &y1, &x2, &y2))
{
width = x2 - x1;
height = y2 - y1;
}
else
{
width = gimp_drawable_width (drawable->drawable_id);
height = gimp_drawable_height (drawable->drawable_id);
}
if (width > height)
{
preview->width = MIN (width, size);
preview->height = (height * preview->width) / width;
}
else
{
preview->height = MIN (height, size);
preview->width = (width * preview->height) / height;
}
gtk_widget_set_size_request (preview->area,
preview->width, preview->height);
}
static gboolean
gimp_zoom_preview_scroll_event (GtkWidget *widget,
GdkEventScroll *event,
GimpZoomPreview *preview)
{
if (event->state & GDK_CONTROL_MASK)
{
GimpZoomPreviewPrivate *priv = GIMP_ZOOM_PREVIEW_GET_PRIVATE (preview);
gimp_scrolled_preview_freeze (GIMP_SCROLLED_PREVIEW (preview));
switch (event->direction)
{
case GDK_SCROLL_UP:
gimp_zoom_model_zoom (priv->model, GIMP_ZOOM_IN, 0.0);
break;
case GDK_SCROLL_DOWN:
gimp_zoom_model_zoom (priv->model, GIMP_ZOOM_OUT, 0.0);
break;
default:
break;
}
gimp_scrolled_preview_thaw (GIMP_SCROLLED_PREVIEW (preview));
}
return FALSE;
}
static void
gimp_zoom_preview_draw (GimpPreview *preview)
{
GimpZoomPreviewPrivate *priv = GIMP_ZOOM_PREVIEW_GET_PRIVATE (preview);
GimpDrawable *drawable;
guchar *data;
gint width;
gint height;
gint bpp;
if (! priv->model)
return;
drawable = priv->drawable;
if (! drawable)
return;
data = gimp_zoom_preview_get_source (GIMP_ZOOM_PREVIEW (preview),
&width, &height, &bpp);
if (data)
{
gimp_preview_area_draw (GIMP_PREVIEW_AREA (preview->area),
0, 0, width, height,
gimp_drawable_type (drawable->drawable_id),
data, width * bpp);
g_free (data);
}
}
static void
gimp_zoom_preview_draw_buffer (GimpPreview *preview,
const guchar *buffer,
gint rowstride)
{
GimpZoomPreviewPrivate *priv = GIMP_ZOOM_PREVIEW_GET_PRIVATE (preview);
GimpDrawable *drawable = priv->drawable;
gint32 image_id;
image_id = gimp_drawable_get_image (drawable->drawable_id);
if (gimp_selection_is_empty (image_id))
{
gimp_preview_area_draw (GIMP_PREVIEW_AREA (preview->area),
0, 0,
preview->width, preview->height,
gimp_drawable_type (drawable->drawable_id),
buffer,
rowstride);
}
else
{
guchar *sel;
guchar *src;
gint selection_id;
gint width, height;
gint bpp;
gint src_x;
gint src_y;
gint src_width;
gint src_height;
selection_id = gimp_image_get_selection (image_id);
width = preview->width;
height = preview->height;
gimp_zoom_preview_get_source_area (preview,
&src_x, &src_y,
&src_width, &src_height);
src = gimp_drawable_get_sub_thumbnail_data (drawable->drawable_id,
src_x, src_y,
src_width, src_height,
&width, &height, &bpp);
sel = gimp_drawable_get_sub_thumbnail_data (selection_id,
src_x, src_y,
src_width, src_height,
&width, &height, &bpp);
gimp_preview_area_mask (GIMP_PREVIEW_AREA (preview->area),
0, 0, preview->width, preview->height,
gimp_drawable_type (drawable->drawable_id),
src, width * drawable->bpp,
buffer, rowstride,
sel, width);
g_free (sel);
g_free (src);
}
}
static void
gimp_zoom_preview_draw_thumb (GimpPreview *preview,
GimpPreviewArea *area,
gint width,
gint height)
{
GimpZoomPreviewPrivate *priv = GIMP_ZOOM_PREVIEW_GET_PRIVATE (preview);
GimpDrawable *drawable = priv->drawable;
if (drawable)
_gimp_drawable_preview_area_draw_thumb (area, drawable, width, height);
}
static void
gimp_zoom_preview_set_cursor (GimpPreview *preview)
{
if (! GTK_WIDGET_REALIZED (preview->area))
return;
if (gimp_zoom_preview_get_factor (GIMP_ZOOM_PREVIEW (preview)) > 1.0)
{
gdk_window_set_cursor (preview->area->window,
GIMP_SCROLLED_PREVIEW (preview)->cursor_move);
}
else
{
gdk_window_set_cursor (preview->area->window, preview->default_cursor);
}
}
static void
gimp_zoom_preview_transform (GimpPreview *preview,
gint src_x,
gint src_y,
gint *dest_x,
gint *dest_y)
{
GimpZoomPreviewPrivate *priv = GIMP_ZOOM_PREVIEW_GET_PRIVATE (preview);
gdouble zoom = gimp_zoom_preview_get_factor (GIMP_ZOOM_PREVIEW (preview));
*dest_x = ((gdouble) (src_x - priv->extents.x) *
preview->width / priv->extents.width * zoom) - preview->xoff;
*dest_y = ((gdouble) (src_y - priv->extents.y) *
preview->height / priv->extents.height * zoom) - preview->yoff;
}
static void
gimp_zoom_preview_untransform (GimpPreview *preview,
gint src_x,
gint src_y,
gint *dest_x,
gint *dest_y)
{
GimpZoomPreviewPrivate *priv = GIMP_ZOOM_PREVIEW_GET_PRIVATE (preview);
gdouble zoom = gimp_zoom_preview_get_factor (GIMP_ZOOM_PREVIEW (preview));
*dest_x = (priv->extents.x +
((gdouble) (src_x + preview->xoff) *
priv->extents.width / preview->width / zoom));
*dest_y = (priv->extents.y +
((gdouble) (src_y + preview->yoff) *
priv->extents.height / preview->height / zoom));
}
static void
gimp_zoom_preview_set_drawable (GimpZoomPreview *preview,
GimpDrawable *drawable)
{
GimpZoomPreviewPrivate *priv = GIMP_ZOOM_PREVIEW_GET_PRIVATE (preview);
gint width, height;
gint max_width, max_height;
gint x1, y1;
gint x2, y2;
g_return_if_fail (priv->drawable == NULL);
priv->drawable = drawable;
if (_gimp_drawable_preview_get_bounds (drawable, &x1, &y1, &x2, &y2))
{
width = x2 - x1;
height = y2 - y1;
priv->extents.x = x1;
priv->extents.y = y1;
}
else
{
width = gimp_drawable_width (drawable->drawable_id);
height = gimp_drawable_height (drawable->drawable_id);
priv->extents.x = 0;
priv->extents.y = 0;
}
priv->extents.width = width;
priv->extents.height = height;
if (width > height)
{
max_width = MIN (width, 512);
max_height = (height * max_width) / width;
}
else
{
max_height = MIN (height, 512);
max_width = (width * max_height) / height;
}
gimp_preview_set_bounds (GIMP_PREVIEW (preview),
0, 0, max_width, max_height);
g_object_set (GIMP_PREVIEW (preview)->frame,
"ratio", (gdouble) width / (gdouble) height,
NULL);
}
static void
gimp_zoom_preview_set_model (GimpZoomPreview *preview,
GimpZoomModel *model)
{
GimpZoomPreviewPrivate *priv = GIMP_ZOOM_PREVIEW_GET_PRIVATE (preview);
GtkWidget *button_bar;
GtkWidget *button;
GtkWidget *box;
g_return_if_fail (priv->model == NULL);
if (! model)
return;
priv->model = g_object_ref (model);
g_signal_connect_swapped (priv->model, "zoomed",
G_CALLBACK (gimp_zoom_preview_set_adjustments),
preview);
box = gimp_preview_get_controls (GIMP_PREVIEW (preview));
g_return_if_fail (GTK_IS_BOX (box));
button_bar = gtk_hbox_new (FALSE, 2);
gtk_box_pack_end (GTK_BOX (box), button_bar, FALSE, FALSE, 0);
gtk_widget_show (button_bar);
/* zoom out */
button = gimp_zoom_button_new (priv->model,
GIMP_ZOOM_OUT, GTK_ICON_SIZE_SMALL_TOOLBAR);
gtk_box_pack_start (GTK_BOX (button_bar), button, FALSE, FALSE, 0);
gtk_widget_show (button);
/* zoom in */
button = gimp_zoom_button_new (priv->model,
GIMP_ZOOM_IN, GTK_ICON_SIZE_SMALL_TOOLBAR);
gtk_box_pack_start (GTK_BOX (button_bar), button, FALSE, FALSE, 0);
gtk_widget_show (button);
}
static void
gimp_zoom_preview_get_source_area (GimpPreview *preview,
gint *x,
gint *y,
gint *w,
gint *h)
{
GimpZoomPreviewPrivate *priv = GIMP_ZOOM_PREVIEW_GET_PRIVATE (preview);
gdouble zoom = gimp_zoom_model_get_factor (priv->model);
gimp_zoom_preview_untransform (preview, 0, 0, x, y);
*w = priv->extents.width / zoom;
*h = priv->extents.height / zoom;
}
/**
* gimp_zoom_preview_new:
* @drawable: a #GimpDrawable
*
* Creates a new #GimpZoomPreview widget for @drawable.
*
* Since: GIMP 2.4
**/
GtkWidget *
gimp_zoom_preview_new (GimpDrawable *drawable)
{
g_return_val_if_fail (drawable != NULL, NULL);
return g_object_new (GIMP_TYPE_ZOOM_PREVIEW,
"drawable", drawable,
NULL);
}
/**
* gimp_zoom_preview_new_with_model:
* @drawable: a #GimpDrawable
* @model: a #GimpZoomModel
*
* Creates a new #GimpZoomPreview widget for @drawable using the
* given @model.
*
* This variant of gimp_zoom_preview_new() allows you to create a
* preview using an existing zoom model. This may be useful if for
* example you want to have two zoom previews that keep their zoom
* factor in sync.
*
* Since: GIMP 2.4
**/
GtkWidget *
gimp_zoom_preview_new_with_model (GimpDrawable *drawable,
GimpZoomModel *model)
{
g_return_val_if_fail (drawable != NULL, NULL);
g_return_val_if_fail (GIMP_IS_ZOOM_MODEL (model), NULL);
return g_object_new (GIMP_TYPE_ZOOM_PREVIEW,
"drawable", drawable,
"model", model,
NULL);
}
/**
* gimp_zoom_preview_get_drawable:
* @preview: a #GimpZoomPreview widget
*
* Returns the #GimpDrawable the #GimpZoomPreview is attached to.
*
* Return Value: the #GimpDrawable that was passed to gimp_zoom_preview_new().
*
* Since: GIMP 2.4
**/
GimpDrawable *
gimp_zoom_preview_get_drawable (GimpZoomPreview *preview)
{
g_return_val_if_fail (GIMP_IS_ZOOM_PREVIEW (preview), NULL);
return GIMP_ZOOM_PREVIEW_GET_PRIVATE (preview)->drawable;
}
/**
* gimp_zoom_preview_get_model:
* @preview: a #GimpZoomPreview widget
*
* Returns the #GimpZoomModel the preview is using.
*
* Return Value: a pointer to the #GimpZoomModel owned by the @preview
*
* Since: GIMP 2.4
**/
GimpZoomModel *
gimp_zoom_preview_get_model (GimpZoomPreview *preview)
{
g_return_val_if_fail (GIMP_IS_ZOOM_PREVIEW (preview), NULL);
return GIMP_ZOOM_PREVIEW_GET_PRIVATE (preview)->model;
}
/**
* gimp_zoom_preview_get_factor:
* @preview: a #GimpZoomPreview widget
*
* Returns the zoom factor the preview is currently using.
*
* Return Value: the current zoom factor
*
* Since: GIMP 2.4
**/
gdouble
gimp_zoom_preview_get_factor (GimpZoomPreview *preview)
{
GimpZoomPreviewPrivate *priv;
g_return_val_if_fail (GIMP_IS_ZOOM_PREVIEW (preview), 1.0);
priv = GIMP_ZOOM_PREVIEW_GET_PRIVATE (preview);
return priv->model ? gimp_zoom_model_get_factor (priv->model) : 1.0;
}
/**
* gimp_zoom_preview_get_source:
* @preview: a #GimpZoomPreview widget
* @width: a pointer to an int where the current width of the zoom widget
* will be put.
* @height: a pointer to an int where the current width of the zoom widget
* will be put.
* @bpp: return location for the number of bytes per pixel
*
* Returns the scaled image data of the part of the drawable the
* #GimpZoomPreview is currently showing, as a newly allocated array of guchar.
* This function also allow to get the current width, height and bpp of the
* #GimpZoomPreview.
*
* Return Value: newly allocated data that should be released using g_free()
* when it is not any longer needed
*
* Since: GIMP 2.4
*/
guchar *
gimp_zoom_preview_get_source (GimpZoomPreview *preview,
gint *width,
gint *height,
gint *bpp)
{
GimpDrawable *drawable;
g_return_val_if_fail (GIMP_IS_ZOOM_PREVIEW (preview), NULL);
g_return_val_if_fail (width != NULL && height != NULL && bpp != NULL, NULL);
drawable = gimp_zoom_preview_get_drawable (preview);
if (drawable)
{
GimpPreview *gimp_preview = GIMP_PREVIEW (preview);
gint src_x;
gint src_y;
gint src_width;
gint src_height;
*width = gimp_preview->width;
*height = gimp_preview->height;
gimp_zoom_preview_get_source_area (gimp_preview,
&src_x, &src_y,
&src_width, &src_height);
return gimp_drawable_get_sub_thumbnail_data (drawable->drawable_id,
src_x, src_y,
src_width, src_height,
width, height, bpp);
}
else
{
*width = 0;
*height = 0;
*bpp = 0;
return NULL;
}
}
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