Adding upstream version 2.10.22.upstream/2.10.22upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1013 insertions, 0 deletions

diff --git a/libgimp/gimpzoompreview.c b/libgimp/gimpzoompreview.c
new file mode 100644
index 0000000..eb0735a
--- /dev/null
+++ b/libgimp/gimpzoompreview.c
@@ -0,0 +1,1013 @@
+/* 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>
+
+/* we use our own deprecated API here */
+#define GIMP_DISABLE_DEPRECATION_WARNINGS
+
+#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,
+  PROP_DRAWABLE_ID,
+  PROP_MODEL
+};
+
+
+struct _GimpZoomPreviewPrivate
+{
+  gint32         drawable_ID;
+  GimpDrawable  *drawable;
+  GimpZoomModel *model;
+  GdkRectangle   extents;
+};
+
+typedef struct
+{
+  gboolean  update;
+} PreviewSettings;
+
+
+#define GIMP_ZOOM_PREVIEW_GET_PRIVATE(obj) \
+  ((GimpZoomPreviewPrivate *) ((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_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_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_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;
+
+  /**
+   * GimpZoomPreview:drawable:
+   *
+   * The drawable the #GimpZoomPreview is attached to.
+   *
+   * Deprecated: use the drawable-id property instead.
+   *
+   * Since: 2.4
+   */
+  g_object_class_install_property (object_class, PROP_DRAWABLE,
+                                   g_param_spec_pointer ("drawable",
+                                                         "Drawable",
+                                                         "Deprecated: use the drawable-id property instead",
+                                                         GIMP_PARAM_READWRITE |
+                                                         G_PARAM_CONSTRUCT_ONLY));
+
+  /**
+   * 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)
+{
+  preview->priv = gimp_zoom_preview_get_instance_private (preview);
+
+  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 void
+gimp_zoom_preview_constructed (GObject *object)
+{
+  GimpZoomPreviewPrivate *priv = GIMP_ZOOM_PREVIEW_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 = GIMP_ZOOM_PREVIEW_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:
+      g_value_set_pointer (value, gimp_zoom_preview_get_drawable (preview));
+      break;
+
+    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:
+      g_return_if_fail (preview->priv->drawable_ID < 1);
+      if (g_value_get_pointer (value))
+        gimp_zoom_preview_set_drawable (preview, g_value_get_pointer (value));
+      break;
+
+    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       *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));
+  gtk_adjustment_configure (adj,
+                            (gtk_adjustment_get_value (adj) + width / 2.0) * ratio
+                            - width / 2.0,
+                            0,
+                            width * new_factor,
+                            new_factor,
+                            MAX (width / 2.0, new_factor),
+                            width);
+
+  adj = gtk_range_get_adjustment (GTK_RANGE (scrolled_preview->vscr));
+  gtk_adjustment_configure (adj,
+                            (gtk_adjustment_get_value (adj) + 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;
+
+  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 (preview->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 (preview)->priv;
+  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 (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;
+    }
+
+  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 (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)
+    {
+      gimp_preview_area_draw (GIMP_PREVIEW_AREA (preview->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;
+  gint32                  image_ID;
+
+  image_ID = gimp_item_get_image (priv->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 (priv->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;
+      gint     offsx = 0;
+      gint     offsy = 0;
+
+      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 (priv->drawable_ID,
+                                                  src_x, src_y,
+                                                  src_width, src_height,
+                                                  &width, &height, &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 (preview->area),
+                              0, 0, preview->width, preview->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)
+{
+  if (! gtk_widget_get_realized (preview->area))
+    return;
+
+  if (gimp_zoom_preview_get_factor (GIMP_ZOOM_PREVIEW (preview)) > 1.0)
+    {
+      gdk_window_set_cursor (gtk_widget_get_window (preview->area),
+                             GIMP_SCROLLED_PREVIEW (preview)->cursor_move);
+    }
+  else
+    {
+      gdk_window_set_cursor (gtk_widget_get_window (preview->area),
+                             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 (preview)->priv;
+
+  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 (preview)->priv;
+
+  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)
+{
+  g_return_if_fail (preview->priv->drawable == NULL);
+  g_return_if_fail (preview->priv->drawable_ID < 1);
+
+  preview->priv->drawable = drawable;
+
+  gimp_zoom_preview_set_drawable_id (preview, drawable->drawable_id);
+}
+
+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 (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_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 = 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_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_new:
+ * @drawable: a #GimpDrawable
+ *
+ * Creates a new #GimpZoomPreview widget for @drawable.
+ *
+ * Deprecated: 2.10: Use gimp_zoom_preview_new_from_drawable_id() instead.
+ *
+ * Since: 2.4
+ *
+ * Returns: a new #GimpZoomPreview.
+ **/
+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.
+ *
+ * Deprecated: 2.10: Use gimp_zoom_preview_new_with_model_from_drawable_id()
+ * instead.
+ *
+ * Since: 2.4
+ *
+ * Returns: a new #GimpZoomPreview.
+ **/
+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_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 GIMP_ZOOM_PREVIEW_GET_PRIVATE (preview)->drawable_ID;
+}
+
+/**
+ * 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().
+ *
+ * Deprecated: 2.10: Use gimp_zoom_preview_get_drawable_id() instead.
+ *
+ * Since: 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: 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: 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: 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;
+
+      *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_ID,
+                                                   src_x, src_y,
+                                                   src_width, src_height,
+                                                   width, height, bpp);
+    }
+  else
+    {
+      *width  = 0;
+      *height = 0;
+      *bpp    = 0;
+
+      return NULL;
+    }
+}