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-rw-r--r--libgimp/gimpdrawablepreview.c757
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diff --git a/libgimp/gimpdrawablepreview.c b/libgimp/gimpdrawablepreview.c
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+/* LIBGIMP - The GIMP Library
+ * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
+ *
+ * gimpdrawablepreview.c
+ *
+ * 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"
+
+
+/**
+ * SECTION: gimpdrawablepreview
+ * @title: GimpDrawablePreview
+ * @short_description: A widget providing a preview of a #GimpDrawable.
+ *
+ * A widget providing a preview of a #GimpDrawable.
+ **/
+
+
+#define SELECTION_BORDER 8
+
+enum
+{
+ PROP_0,
+ PROP_DRAWABLE,
+ PROP_DRAWABLE_ID
+};
+
+typedef struct
+{
+ gint32 drawable_ID;
+} GimpDrawablePreviewPrivate;
+
+typedef struct
+{
+ gint x;
+ gint y;
+ gboolean update;
+} PreviewSettings;
+
+
+#define GIMP_DRAWABLE_PREVIEW_GET_PRIVATE(obj) \
+ ((GimpDrawablePreviewPrivate *) gimp_drawable_preview_get_instance_private ((GimpDrawablePreview *) (preview)))
+
+static void gimp_drawable_preview_constructed (GObject *object);
+static void gimp_drawable_preview_dispose (GObject *object);
+static void gimp_drawable_preview_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec);
+static void gimp_drawable_preview_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec);
+
+static void gimp_drawable_preview_style_set (GtkWidget *widget,
+ GtkStyle *prev_style);
+
+static void gimp_drawable_preview_draw_original (GimpPreview *preview);
+static void gimp_drawable_preview_draw_thumb (GimpPreview *preview,
+ GimpPreviewArea *area,
+ gint width,
+ gint height);
+static void gimp_drawable_preview_draw_buffer (GimpPreview *preview,
+ const guchar *buffer,
+ gint rowstride);
+
+static void gimp_drawable_preview_set_drawable (GimpDrawablePreview *preview,
+ GimpDrawable *drawable);
+static void gimp_drawable_preview_set_drawable_id
+ (GimpDrawablePreview *preview,
+ gint32 drawable_ID);
+
+
+G_DEFINE_TYPE_WITH_PRIVATE (GimpDrawablePreview, gimp_drawable_preview,
+ GIMP_TYPE_SCROLLED_PREVIEW)
+
+#define parent_class gimp_drawable_preview_parent_class
+
+static gint gimp_drawable_preview_counter = 0;
+
+
+static void
+gimp_drawable_preview_class_init (GimpDrawablePreviewClass *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_drawable_preview_constructed;
+ object_class->dispose = gimp_drawable_preview_dispose;
+ object_class->get_property = gimp_drawable_preview_get_property;
+ object_class->set_property = gimp_drawable_preview_set_property;
+
+ widget_class->style_set = gimp_drawable_preview_style_set;
+
+ preview_class->draw = gimp_drawable_preview_draw_original;
+ preview_class->draw_thumb = gimp_drawable_preview_draw_thumb;
+ preview_class->draw_buffer = gimp_drawable_preview_draw_buffer;
+
+ /**
+ * GimpDrawablePreview:drawable:
+ *
+ * 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));
+
+ /**
+ * GimpDrawablePreview:drawable-id:
+ *
+ * The drawable the #GimpDrawablePreview 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));
+
+}
+
+static void
+gimp_drawable_preview_init (GimpDrawablePreview *preview)
+{
+ g_object_set (GIMP_PREVIEW (preview)->area,
+ "check-size", gimp_check_size (),
+ "check-type", gimp_check_type (),
+ NULL);
+}
+
+static void
+gimp_drawable_preview_constructed (GObject *object)
+{
+ gchar *data_name;
+ PreviewSettings settings;
+
+ G_OBJECT_CLASS (parent_class)->constructed (object);
+
+ data_name = g_strdup_printf ("%s-drawable-preview-%d",
+ g_get_prgname (),
+ ++gimp_drawable_preview_counter);
+
+ if (gimp_get_data (data_name, &settings))
+ {
+ gimp_preview_set_update (GIMP_PREVIEW (object), settings.update);
+ gimp_scrolled_preview_set_position (GIMP_SCROLLED_PREVIEW (object),
+ settings.x, settings.y);
+ }
+
+ g_object_set_data_full (object, "gimp-drawable-preview-data-name",
+ data_name, (GDestroyNotify) g_free);
+}
+
+static void
+gimp_drawable_preview_dispose (GObject *object)
+{
+ const gchar *data_name = g_object_get_data (G_OBJECT (object),
+ "gimp-drawable-preview-data-name");
+
+ if (data_name)
+ {
+ GimpPreview *preview = GIMP_PREVIEW (object);
+ PreviewSettings settings;
+
+ settings.x = preview->xoff + preview->xmin;
+ settings.y = preview->yoff + preview->ymin;
+ 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_drawable_preview_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ GimpDrawablePreview *preview = GIMP_DRAWABLE_PREVIEW (object);
+
+ switch (property_id)
+ {
+ case PROP_DRAWABLE:
+ g_value_set_pointer (value, preview->drawable);
+ break;
+
+ case PROP_DRAWABLE_ID:
+ g_value_set_int (value,
+ gimp_drawable_preview_get_drawable_id (preview));
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_drawable_preview_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ GimpDrawablePreview *preview = GIMP_DRAWABLE_PREVIEW (object);
+ GimpDrawablePreviewPrivate *priv = GIMP_DRAWABLE_PREVIEW_GET_PRIVATE (preview);
+
+ switch (property_id)
+ {
+ case PROP_DRAWABLE:
+ g_return_if_fail (priv->drawable_ID < 1);
+ if (g_value_get_pointer (value))
+ gimp_drawable_preview_set_drawable (preview,
+ g_value_get_pointer (value));
+ break;
+
+ case PROP_DRAWABLE_ID:
+ gimp_drawable_preview_set_drawable_id (preview,
+ g_value_get_int (value));
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_drawable_preview_style_set (GtkWidget *widget,
+ GtkStyle *prev_style)
+{
+ GimpPreview *preview = GIMP_PREVIEW (widget);
+ gint width = preview->xmax - preview->xmin;
+ gint height = preview->ymax - preview->ymin;
+ gint size;
+
+ 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);
+
+ gtk_widget_set_size_request (GIMP_PREVIEW (preview)->area,
+ MIN (width, size), MIN (height, size));
+}
+
+static void
+gimp_drawable_preview_draw_original (GimpPreview *preview)
+{
+ GimpDrawablePreviewPrivate *priv = GIMP_DRAWABLE_PREVIEW_GET_PRIVATE (preview);
+ guchar *buffer;
+ gint width, height;
+ gint bpp;
+ GimpImageType type;
+
+ if (priv->drawable_ID < 1)
+ return;
+
+ preview->xoff = CLAMP (preview->xoff,
+ 0, preview->xmax - preview->xmin - preview->width);
+ preview->yoff = CLAMP (preview->yoff,
+ 0, preview->ymax - preview->ymin - preview->height);
+
+ width = preview->width;
+ height = preview->height;
+
+ buffer = gimp_drawable_get_sub_thumbnail_data (priv->drawable_ID,
+ preview->xoff + preview->xmin,
+ preview->yoff + preview->ymin,
+ preview->width, preview->height,
+ &width, &height, &bpp);
+
+ switch (bpp)
+ {
+ case 1: type = GIMP_GRAY_IMAGE; break;
+ case 2: type = GIMP_GRAYA_IMAGE; break;
+ case 3: type = GIMP_RGB_IMAGE; break;
+ case 4: type = GIMP_RGBA_IMAGE; break;
+ default:
+ g_free (buffer);
+ return;
+ }
+
+ gimp_preview_area_draw (GIMP_PREVIEW_AREA (preview->area),
+ 0, 0, width, height, type, buffer, width * bpp);
+ g_free (buffer);
+}
+
+static void
+gimp_drawable_preview_draw_thumb (GimpPreview *preview,
+ GimpPreviewArea *area,
+ gint width,
+ gint height)
+{
+ GimpDrawablePreviewPrivate *priv = GIMP_DRAWABLE_PREVIEW_GET_PRIVATE (preview);
+
+ if (priv->drawable_ID > 0)
+ _gimp_drawable_preview_area_draw_thumb (area, priv->drawable_ID,
+ width, height);
+}
+
+void
+_gimp_drawable_preview_area_draw_thumb (GimpPreviewArea *area,
+ gint32 drawable_ID,
+ gint width,
+ gint height)
+{
+ guchar *buffer;
+ gint x1, y1, x2, y2;
+ gint bpp;
+ gint size = 100;
+ gint nav_width, nav_height;
+
+ g_return_if_fail (GIMP_IS_PREVIEW_AREA (area));
+ g_return_if_fail (gimp_item_is_valid (drawable_ID));
+ g_return_if_fail (gimp_item_is_drawable (drawable_ID));
+
+ if (_gimp_drawable_preview_get_bounds (drawable_ID, &x1, &y1, &x2, &y2))
+ {
+ width = x2 - x1;
+ height = y2 - y1;
+ }
+ else
+ {
+ width = gimp_drawable_width (drawable_ID);
+ height = gimp_drawable_height (drawable_ID);
+ }
+
+ if (width > height)
+ {
+ nav_width = MIN (width, size);
+ nav_height = (height * nav_width) / width;
+ }
+ else
+ {
+ nav_height = MIN (height, size);
+ nav_width = (width * nav_height) / height;
+ }
+
+ if (_gimp_drawable_preview_get_bounds (drawable_ID, &x1, &y1, &x2, &y2))
+ {
+ buffer = gimp_drawable_get_sub_thumbnail_data (drawable_ID,
+ x1, y1, x2 - x1, y2 - y1,
+ &nav_width, &nav_height,
+ &bpp);
+ }
+ else
+ {
+ buffer = gimp_drawable_get_thumbnail_data (drawable_ID,
+ &nav_width, &nav_height,
+ &bpp);
+ }
+
+ if (buffer)
+ {
+ GimpImageType type;
+
+ gtk_widget_set_size_request (GTK_WIDGET (area), nav_width, nav_height);
+ gtk_widget_show (GTK_WIDGET (area));
+ gtk_widget_realize (GTK_WIDGET (area));
+
+ switch (bpp)
+ {
+ case 1: type = GIMP_GRAY_IMAGE; break;
+ case 2: type = GIMP_GRAYA_IMAGE; break;
+ case 3: type = GIMP_RGB_IMAGE; break;
+ case 4: type = GIMP_RGBA_IMAGE; break;
+ default:
+ g_free (buffer);
+ return;
+ }
+
+ gimp_preview_area_draw (area,
+ 0, 0, nav_width, nav_height,
+ type, buffer, bpp * nav_width);
+ g_free (buffer);
+ }
+}
+
+static void
+gimp_drawable_preview_draw_area (GimpDrawablePreview *preview,
+ gint x,
+ gint y,
+ gint width,
+ gint height,
+ const guchar *buf,
+ gint rowstride)
+{
+ GimpDrawablePreviewPrivate *priv = GIMP_DRAWABLE_PREVIEW_GET_PRIVATE (preview);
+ GimpPreview *gimp_preview = GIMP_PREVIEW (preview);
+ 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 (gimp_preview->area),
+ x - gimp_preview->xoff - gimp_preview->xmin,
+ y - gimp_preview->yoff - gimp_preview->ymin,
+ width,
+ height,
+ gimp_drawable_type (priv->drawable_ID),
+ buf, rowstride);
+ }
+ else
+ {
+ gint offset_x, offset_y;
+ gint mask_x, mask_y;
+ gint mask_width, mask_height;
+ gint draw_x, draw_y;
+ gint draw_width, draw_height;
+
+ gimp_drawable_offsets (priv->drawable_ID, &offset_x, &offset_y);
+
+ if (gimp_drawable_mask_intersect (priv->drawable_ID,
+ &mask_x, &mask_y,
+ &mask_width, &mask_height) &&
+ gimp_rectangle_intersect (mask_x, mask_y,
+ mask_width, mask_height,
+ x, y, width, height,
+ &draw_x, &draw_y,
+ &draw_width, &draw_height))
+ {
+ GimpImageType type;
+ gint32 selection_ID;
+ guchar *src;
+ guchar *sel;
+ gint d_w, d_h, d_bpp;
+ gint s_w, s_h, s_bpp;
+
+ d_w = draw_width;
+ d_h = draw_height;
+
+ s_w = draw_width;
+ s_h = draw_height;
+
+ selection_ID = gimp_image_get_selection (image_ID);
+
+ src = gimp_drawable_get_sub_thumbnail_data (priv->drawable_ID,
+ draw_x, draw_y,
+ draw_width, draw_height,
+ &d_w, &d_h,
+ &d_bpp);
+
+ sel = gimp_drawable_get_sub_thumbnail_data (selection_ID,
+ draw_x + offset_x,
+ draw_y + offset_y,
+ draw_width, draw_height,
+ &s_w, &s_h,
+ &s_bpp);
+
+ switch (d_bpp)
+ {
+ case 1: type = GIMP_GRAY_IMAGE; break;
+ case 2: type = GIMP_GRAYA_IMAGE; break;
+ case 3: type = GIMP_RGB_IMAGE; break;
+ case 4: type = GIMP_RGBA_IMAGE; break;
+ default:
+ g_free (sel);
+ g_free (src);
+ return;
+ }
+
+ gimp_preview_area_mask (GIMP_PREVIEW_AREA (gimp_preview->area),
+ draw_x - gimp_preview->xoff - gimp_preview->xmin,
+ draw_y - gimp_preview->yoff - gimp_preview->ymin,
+ draw_width,
+ draw_height,
+ type,
+ src, draw_width * d_bpp,
+ (buf +
+ (draw_x - x) * d_bpp +
+ (draw_y - y) * d_w * d_bpp),
+ rowstride,
+ sel, s_w);
+
+ g_free (sel);
+ g_free (src);
+ }
+ }
+}
+
+static void
+gimp_drawable_preview_draw_buffer (GimpPreview *preview,
+ const guchar *buffer,
+ gint rowstride)
+{
+ gimp_drawable_preview_draw_area (GIMP_DRAWABLE_PREVIEW (preview),
+ preview->xmin + preview->xoff,
+ preview->ymin + preview->yoff,
+ preview->width,
+ preview->height,
+ buffer, rowstride);
+}
+
+static void
+gimp_drawable_preview_set_drawable (GimpDrawablePreview *drawable_preview,
+ GimpDrawable *drawable)
+{
+ GimpPreview *preview = GIMP_PREVIEW (drawable_preview);
+ GimpDrawablePreviewPrivate *priv = GIMP_DRAWABLE_PREVIEW_GET_PRIVATE (preview);
+
+ g_return_if_fail (drawable_preview->drawable == NULL);
+ g_return_if_fail (priv->drawable_ID < 1);
+
+ drawable_preview->drawable = drawable;
+
+ gimp_drawable_preview_set_drawable_id (drawable_preview,
+ drawable->drawable_id);
+}
+
+static void
+gimp_drawable_preview_set_drawable_id (GimpDrawablePreview *drawable_preview,
+ gint32 drawable_ID)
+{
+ GimpPreview *preview = GIMP_PREVIEW (drawable_preview);
+ GimpDrawablePreviewPrivate *priv = GIMP_DRAWABLE_PREVIEW_GET_PRIVATE (preview);
+ gint x1, y1, x2, y2;
+
+ g_return_if_fail (priv->drawable_ID < 1);
+
+ priv->drawable_ID = drawable_ID;
+
+ _gimp_drawable_preview_get_bounds (drawable_ID, &x1, &y1, &x2, &y2);
+
+ gimp_preview_set_bounds (preview, x1, y1, x2, y2);
+
+ if (gimp_drawable_is_indexed (drawable_ID))
+ {
+ guint32 image_ID = gimp_item_get_image (drawable_ID);
+ guchar *cmap;
+ gint num_colors;
+
+ cmap = gimp_image_get_colormap (image_ID, &num_colors);
+ gimp_preview_area_set_colormap (GIMP_PREVIEW_AREA (preview->area),
+ cmap, num_colors);
+ g_free (cmap);
+ }
+}
+
+
+#define MAX3(a, b, c) (MAX (MAX ((a), (b)), (c)))
+#define MIN3(a, b, c) (MIN (MIN ((a), (b)), (c)))
+
+gboolean
+_gimp_drawable_preview_get_bounds (gint32 drawable_ID,
+ gint *xmin,
+ gint *ymin,
+ gint *xmax,
+ gint *ymax)
+{
+ gint width;
+ gint height;
+ gint offset_x;
+ gint offset_y;
+ gint x1, y1;
+ gint x2, y2;
+ gboolean retval;
+
+ g_return_val_if_fail (gimp_item_is_valid (drawable_ID), FALSE);
+ g_return_val_if_fail (gimp_item_is_drawable (drawable_ID), FALSE);
+
+ width = gimp_drawable_width (drawable_ID);
+ height = gimp_drawable_height (drawable_ID);
+
+ retval = gimp_drawable_mask_bounds (drawable_ID, &x1, &y1, &x2, &y2);
+
+ gimp_drawable_offsets (drawable_ID, &offset_x, &offset_y);
+
+ *xmin = MAX3 (x1 - SELECTION_BORDER, 0, - offset_x);
+ *ymin = MAX3 (y1 - SELECTION_BORDER, 0, - offset_y);
+ *xmax = MIN3 (x2 + SELECTION_BORDER, width, width + offset_x);
+ *ymax = MIN3 (y2 + SELECTION_BORDER, height, height + offset_y);
+
+ return retval;
+}
+
+
+/**
+ * gimp_drawable_preview_new_from_drawable_id:
+ * @drawable_ID: a drawable ID
+ *
+ * Creates a new #GimpDrawablePreview widget for @drawable_ID.
+ *
+ * Returns: A pointer to the new #GimpDrawablePreview widget.
+ *
+ * Since: 2.10
+ **/
+GtkWidget *
+gimp_drawable_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_DRAWABLE_PREVIEW,
+ "drawable-id", drawable_ID,
+ NULL);
+}
+
+/**
+ * gimp_drawable_preview_get_drawable_id:
+ * @preview: a #GimpDrawablePreview widget
+ *
+ * Return value: the drawable_ID that has been passed to
+ * gimp_drawable_preview_new_from_drawable_id().
+ *
+ * Since: 2.10
+ **/
+gint32
+gimp_drawable_preview_get_drawable_id (GimpDrawablePreview *preview)
+{
+ g_return_val_if_fail (GIMP_IS_DRAWABLE_PREVIEW (preview), -1);
+
+ return GIMP_DRAWABLE_PREVIEW_GET_PRIVATE (preview)->drawable_ID;
+}
+
+/**
+ * gimp_drawable_preview_new:
+ * @drawable: a #GimpDrawable
+ * @toggle: unused
+ *
+ * Creates a new #GimpDrawablePreview widget for @drawable.
+ *
+ * In GIMP 2.2 the @toggle parameter was provided to conviently access
+ * the state of the "Preview" check-button. This is not any longer
+ * necessary as the preview itself now stores this state, as well as
+ * the scroll offset.
+ *
+ * Returns: A pointer to the new #GimpDrawablePreview widget.
+ *
+ * Deprecated: Use gimp_drawable_preview_new_from_drawable_id() instead.
+ *
+ * Since: 2.2
+ **/
+GtkWidget *
+gimp_drawable_preview_new (GimpDrawable *drawable,
+ gboolean *toggle)
+{
+ g_return_val_if_fail (drawable != NULL, NULL);
+
+ return g_object_new (GIMP_TYPE_DRAWABLE_PREVIEW,
+ "drawable", drawable,
+ NULL);
+}
+
+/**
+ * gimp_drawable_preview_get_drawable:
+ * @preview: a #GimpDrawablePreview widget
+ *
+ * Return value: the #GimpDrawable that has been passed to
+ * gimp_drawable_preview_new().
+ *
+ * Deprecated: use gimp_drawable_preview_get_drawable_id() instead.
+ *
+ * Since: 2.2
+ **/
+GimpDrawable *
+gimp_drawable_preview_get_drawable (GimpDrawablePreview *preview)
+{
+ g_return_val_if_fail (GIMP_IS_DRAWABLE_PREVIEW (preview), NULL);
+
+ return preview->drawable;
+}
+
+/**
+ * gimp_drawable_preview_draw_region:
+ * @preview: a #GimpDrawablePreview widget
+ * @region: a #GimpPixelRgn
+ *
+ * Since: 2.2
+ **/
+void
+gimp_drawable_preview_draw_region (GimpDrawablePreview *preview,
+ const GimpPixelRgn *region)
+{
+ GimpDrawablePreviewPrivate *priv;
+
+ g_return_if_fail (GIMP_IS_DRAWABLE_PREVIEW (preview));
+ g_return_if_fail (region != NULL);
+
+ priv = GIMP_DRAWABLE_PREVIEW_GET_PRIVATE (preview);
+
+ g_return_if_fail (priv->drawable_ID > 0);
+
+ /* If the data field is initialized, this region is currently being
+ * processed and we can access it directly.
+ */
+ if (region->data)
+ {
+ gimp_drawable_preview_draw_area (preview,
+ region->x,
+ region->y,
+ region->w,
+ region->h,
+ region->data,
+ region->rowstride);
+ }
+ else
+ {
+ GimpPixelRgn src = *region;
+ gpointer iter;
+
+ src.dirty = FALSE; /* we don't dirty the tiles, just read them */
+
+ for (iter = gimp_pixel_rgns_register (1, &src);
+ iter != NULL;
+ iter = gimp_pixel_rgns_process (iter))
+ {
+ gimp_drawable_preview_draw_area (preview,
+ src.x,
+ src.y,
+ src.w,
+ src.h,
+ src.data,
+ src.rowstride);
+ }
+ }
+}