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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 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 "libgimpwidgets/gimpwidgets.h"
#include "gimpuitypes.h"
#include "gimp.h"
#include "gimpdrawablepreview.h"
#include "gimpzoompreview.h"
/**
* SECTION: gimpzoompreview
* @title: GimpZoomPreview
* @short_description: A drawable preview with zooming capabilities.
*
* A drawable preview with zooming capabilities.
**/
enum
{
PROP_0,
PROP_DRAWABLE_ID,
PROP_MODEL
};
typedef struct
{
gboolean update;
} PreviewSettings;
struct _GimpZoomPreviewPrivate
{
gint32 drawable_ID;
GimpZoomModel *model;
GdkRectangle extents;
};
#define GET_PRIVATE(obj) (((GimpZoomPreview *) (obj))->priv)
static void gimp_zoom_preview_constructed (GObject *object);
static void gimp_zoom_preview_finalize (GObject *object);
static void gimp_zoom_preview_dispose (GObject *object);
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_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_updated (GtkWidget *widget);
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_id (GimpZoomPreview *preview,
gint32 drawable_ID);
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_WITH_PRIVATE (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);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
GimpPreviewClass *preview_class = GIMP_PREVIEW_CLASS (klass);
object_class->constructed = gimp_zoom_preview_constructed;
object_class->finalize = gimp_zoom_preview_finalize;
object_class->dispose = gimp_zoom_preview_dispose;
object_class->get_property = gimp_zoom_preview_get_property;
object_class->set_property = gimp_zoom_preview_set_property;
widget_class->style_updated = gimp_zoom_preview_style_updated;
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;
/**
* GimpZoomPreview:drawable-id:
*
* The drawable the #GimpZoomPreview is attached to.
*
* Since: 2.10
*/
g_object_class_install_property (object_class, PROP_DRAWABLE_ID,
g_param_spec_int ("drawable-id",
"Drawable ID",
"The drawable this preview is attached to",
-1, G_MAXINT, -1,
GIMP_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY));
/**
* GimpZoomPreview:model:
*
* The #GimpZoomModel used by this #GimpZoomPreview.
*
* Since: 2.4
*/
g_object_class_install_property (object_class, PROP_MODEL,
g_param_spec_object ("model",
"Model",
"The zoom preview's GimpZoomModel",
GIMP_TYPE_ZOOM_MODEL,
GIMP_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY));
}
static void
gimp_zoom_preview_init (GimpZoomPreview *preview)
{
GtkWidget *area = gimp_preview_get_area (GIMP_PREVIEW (preview));
preview->priv = gimp_zoom_preview_get_instance_private (preview);
g_signal_connect (area, "size-allocate",
G_CALLBACK (gimp_zoom_preview_size_allocate),
preview);
g_signal_connect (area, "scroll-event",
G_CALLBACK (gimp_zoom_preview_scroll_event),
preview);
g_object_set (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 void
gimp_zoom_preview_constructed (GObject *object)
{
GimpZoomPreviewPrivate *priv = GET_PRIVATE (object);
gchar *data_name;
PreviewSettings settings;
G_OBJECT_CLASS (parent_class)->constructed (object);
data_name = g_strdup_printf ("%s-zoom-preview-%d",
g_get_prgname (),
gimp_zoom_preview_counter++);
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);
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);
}
static void
gimp_zoom_preview_finalize (GObject *object)
{
GimpZoomPreviewPrivate *priv = GET_PRIVATE (object);
g_clear_object (&priv->model);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gimp_zoom_preview_dispose (GObject *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));
}
G_OBJECT_CLASS (parent_class)->dispose (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_ID:
g_value_set_int (value, gimp_zoom_preview_get_drawable_id (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_ID:
gimp_zoom_preview_set_drawable_id (preview, g_value_get_int (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_set_adjustments (GimpZoomPreview *preview,
gdouble old_factor,
gdouble new_factor)
{
GimpScrolledPreview *scrolled_preview = GIMP_SCROLLED_PREVIEW (preview);
GtkAdjustment *hadj;
GtkAdjustment *vadj;
gint width;
gint height;
gdouble ratio;
gimp_scrolled_preview_freeze (scrolled_preview);
gimp_preview_get_size (GIMP_PREVIEW (preview), &width, &height);
ratio = new_factor / old_factor;
gimp_scrolled_preview_get_adjustments (scrolled_preview, &hadj, &vadj);
gtk_adjustment_configure (hadj,
(gtk_adjustment_get_value (vadj) + width / 2.0) * ratio
- width / 2.0,
0,
width * new_factor,
new_factor,
MAX (width / 2.0, new_factor),
width);
gtk_adjustment_configure (vadj,
(gtk_adjustment_get_value (vadj) + height / 2.0) * ratio
- height / 2.0,
0,
height * new_factor,
new_factor,
MAX (height / 2.0, new_factor),
height);
gimp_scrolled_preview_thaw (scrolled_preview);
}
static void
gimp_zoom_preview_size_allocate (GtkWidget *widget,
GtkAllocation *allocation,
GimpZoomPreview *preview)
{
gdouble zoom;
#if 0
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);
#endif
zoom = gimp_zoom_model_get_factor (preview->priv->model);
gimp_zoom_preview_set_adjustments (preview, zoom, zoom);
}
static void
gimp_zoom_preview_style_updated (GtkWidget *widget)
{
GimpPreview *preview = GIMP_PREVIEW (widget);
GtkWidget *area = gimp_preview_get_area (preview);
GTK_WIDGET_CLASS (parent_class)->style_updated (widget);
if (area)
{
GimpZoomPreviewPrivate *priv = GET_PRIVATE (preview);
gint size;
gint width;
gint height;
gint preview_width;
gint preview_height;
gint x1, y1;
gint x2, y2;
gtk_widget_style_get (widget, "size", &size, NULL);
if (_gimp_drawable_preview_get_bounds (priv->drawable_ID,
&x1, &y1, &x2, &y2))
{
width = x2 - x1;
height = y2 - y1;
}
else
{
width = gimp_drawable_width (priv->drawable_ID);
height = gimp_drawable_height (priv->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;
}
gimp_preview_set_size (preview, 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 = GET_PRIVATE (preview);
gdouble delta;
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;
case GDK_SCROLL_SMOOTH:
gdk_event_get_scroll_deltas ((GdkEvent *) event, NULL, &delta);
gimp_zoom_model_zoom (priv->model, GIMP_ZOOM_SMOOTH, delta);
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 (preview)->priv;
guchar *data;
gint width;
gint height;
gint bpp;
if (! priv->model)
return;
if (priv->drawable_ID < 1)
return;
data = gimp_zoom_preview_get_source (GIMP_ZOOM_PREVIEW (preview),
&width, &height, &bpp);
if (data)
{
GtkWidget *area = gimp_preview_get_area (preview);
gimp_preview_area_draw (GIMP_PREVIEW_AREA (area),
0, 0, width, height,
gimp_drawable_type (priv->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 (preview)->priv;
GtkWidget *area = gimp_preview_get_area (preview);
gint width;
gint height;
gint32 image_ID;
gimp_preview_get_size (preview, &width, &height);
image_ID = gimp_item_get_image (priv->drawable_ID);
if (gimp_selection_is_empty (image_ID))
{
gimp_preview_area_draw (GIMP_PREVIEW_AREA (area),
0, 0,
width, height,
gimp_drawable_type (priv->drawable_ID),
buffer,
rowstride);
}
else
{
guchar *sel;
guchar *src;
gint selection_ID;
gint w, h;
gint bpp;
gint src_x;
gint src_y;
gint src_width;
gint src_height;
gint offsx = 0;
gint offsy = 0;
selection_ID = gimp_image_get_selection (image_ID);
w = width;
h = height;
gimp_zoom_preview_get_source_area (preview,
&src_x, &src_y,
&src_width, &src_height);
src = gimp_drawable_get_sub_thumbnail_data (priv->drawable_ID,
src_x, src_y,
src_width, src_height,
&w, &h, &bpp);
gimp_drawable_offsets (priv->drawable_ID, &offsx, &offsy);
sel = gimp_drawable_get_sub_thumbnail_data (selection_ID,
src_x + offsx, src_y + offsy,
src_width, src_height,
&width, &height, &bpp);
gimp_preview_area_mask (GIMP_PREVIEW_AREA (area),
0, 0, width, height,
gimp_drawable_type (priv->drawable_ID),
src, width * gimp_drawable_bpp (priv->drawable_ID),
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 (preview)->priv;
if (priv->drawable_ID > 0)
_gimp_drawable_preview_area_draw_thumb (area, priv->drawable_ID,
width, height);
}
static void
gimp_zoom_preview_set_cursor (GimpPreview *preview)
{
GtkWidget *area = gimp_preview_get_area (preview);
if (! gtk_widget_get_realized (area))
return;
if (gimp_zoom_preview_get_factor (GIMP_ZOOM_PREVIEW (preview)) > 1.0)
{
GdkDisplay *display = gtk_widget_get_display (GTK_WIDGET (preview));
GdkCursor *cursor;
cursor = gdk_cursor_new_for_display (display, GDK_HAND1);
gdk_window_set_cursor (gtk_widget_get_window (area),
cursor);
g_object_unref (cursor);
}
else
{
gdk_window_set_cursor (gtk_widget_get_window (area),
gimp_preview_get_default_cursor (preview));
}
}
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 (preview)->priv;
gint width;
gint height;
gint xoff;
gint yoff;
gdouble zoom;
gimp_preview_get_size (preview, &width, &height);
gimp_preview_get_offsets (preview, &xoff, &yoff);
zoom = gimp_zoom_preview_get_factor (GIMP_ZOOM_PREVIEW (preview));
*dest_x = ((gdouble) (src_x - priv->extents.x) *
width / priv->extents.width * zoom) - xoff;
*dest_y = ((gdouble) (src_y - priv->extents.y) *
height / priv->extents.height * zoom) - 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 (preview)->priv;
gint width;
gint height;
gint xoff;
gint yoff;
gdouble zoom;
gimp_preview_get_size (preview, &width, &height);
gimp_preview_get_offsets (preview, &xoff, &yoff);
zoom = gimp_zoom_preview_get_factor (GIMP_ZOOM_PREVIEW (preview));
*dest_x = (priv->extents.x +
((gdouble) (src_x + xoff) *
priv->extents.width / width / zoom));
*dest_y = (priv->extents.y +
((gdouble) (src_y + yoff) *
priv->extents.height / height / zoom));
}
static void
gimp_zoom_preview_set_drawable_id (GimpZoomPreview *preview,
gint32 drawable_ID)
{
GimpZoomPreviewPrivate *priv = preview->priv;
gint x, y;
gint width, height;
gint max_width, max_height;
g_return_if_fail (preview->priv->drawable_ID < 1);
priv->drawable_ID = drawable_ID;
if (gimp_drawable_mask_intersect (drawable_ID, &x, &y, &width, &height))
{
priv->extents.x = x;
priv->extents.y = y;
}
else
{
width = gimp_drawable_width (drawable_ID);
height = gimp_drawable_height (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_get_frame (GIMP_PREVIEW (preview)),
"ratio", (gdouble) width / (gdouble) height,
NULL);
}
static void
gimp_zoom_preview_set_model (GimpZoomPreview *preview,
GimpZoomModel *model)
{
GimpZoomPreviewPrivate *priv = 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_box_new (GTK_ORIENTATION_HORIZONTAL, 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 = 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_from_drawable_id:
* @drawable_ID: a drawable ID
*
* Creates a new #GimpZoomPreview widget for @drawable_ID.
*
* Since: 2.10
*
* Returns: a new #GimpZoomPreview.
**/
GtkWidget *
gimp_zoom_preview_new_from_drawable_id (gint32 drawable_ID)
{
g_return_val_if_fail (gimp_item_is_valid (drawable_ID), NULL);
g_return_val_if_fail (gimp_item_is_drawable (drawable_ID), NULL);
return g_object_new (GIMP_TYPE_ZOOM_PREVIEW,
"drawable-id", drawable_ID,
NULL);
}
/**
* gimp_zoom_preview_new_with_model_from_drawable_id:
* @drawable_ID: a drawable ID
* @model: a #GimpZoomModel
*
* Creates a new #GimpZoomPreview widget for @drawable_ID using the
* given @model.
*
* This variant of gimp_zoom_preview_new_from_drawable_id() 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: 2.10
*
* Returns: a new #GimpZoomPreview.
**/
GtkWidget *
gimp_zoom_preview_new_with_model_from_drawable_id (gint32 drawable_ID,
GimpZoomModel *model)
{
g_return_val_if_fail (gimp_item_is_valid (drawable_ID), NULL);
g_return_val_if_fail (gimp_item_is_drawable (drawable_ID), NULL);
g_return_val_if_fail (GIMP_IS_ZOOM_MODEL (model), NULL);
return g_object_new (GIMP_TYPE_ZOOM_PREVIEW,
"drawable-id", drawable_ID,
"model", model,
NULL);
}
/**
* gimp_zoom_preview_get_drawable_id:
* @preview: a #GimpZoomPreview widget
*
* Returns the drawable_ID the #GimpZoomPreview is attached to.
*
* Return Value: the drawable_ID that was passed to
* gimp_zoom_preview_new_from_drawable_id().
*
* Since: 2.10
**/
gint32
gimp_zoom_preview_get_drawable_id (GimpZoomPreview *preview)
{
g_return_val_if_fail (GIMP_IS_ZOOM_PREVIEW (preview), -1);
return GET_PRIVATE (preview)->drawable_ID;
}
/**
* 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: 2.4
**/
GimpZoomModel *
gimp_zoom_preview_get_model (GimpZoomPreview *preview)
{
g_return_val_if_fail (GIMP_IS_ZOOM_PREVIEW (preview), NULL);
return 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: 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 = 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: 2.4
*/
guchar *
gimp_zoom_preview_get_source (GimpZoomPreview *preview,
gint *width,
gint *height,
gint *bpp)
{
gint32 drawable_ID;
g_return_val_if_fail (GIMP_IS_ZOOM_PREVIEW (preview), NULL);
g_return_val_if_fail (width != NULL && height != NULL && bpp != NULL, NULL);
drawable_ID = gimp_zoom_preview_get_drawable_id (preview);
if (drawable_ID > 0)
{
GimpPreview *gimp_preview = GIMP_PREVIEW (preview);
gint src_x;
gint src_y;
gint src_width;
gint src_height;
gimp_preview_get_size (gimp_preview, width, 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_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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