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-rw-r--r--libgimp/gimpaspectpreview.c483
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diff --git a/libgimp/gimpaspectpreview.c b/libgimp/gimpaspectpreview.c
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+/* LIBGIMP - The GIMP Library
+ * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
+ *
+ * gimpaspectpreview.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>
+
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "gimpuitypes.h"
+
+#include "gimp.h"
+
+#include "libgimp-intl.h"
+
+#include "gimpaspectpreview.h"
+
+
+/**
+ * SECTION: gimpaspectpreview
+ * @title: GimpAspectPreview
+ * @short_description: A widget providing a preview with fixed aspect ratio.
+ *
+ * A widget providing a preview with fixed aspect ratio.
+ **/
+
+
+enum
+{
+ PROP_0,
+ PROP_DRAWABLE,
+ PROP_DRAWABLE_ID
+};
+
+typedef struct
+{
+ gint32 drawable_ID;
+} GimpAspectPreviewPrivate;
+
+typedef struct
+{
+ gboolean update;
+} PreviewSettings;
+
+
+#define GIMP_ASPECT_PREVIEW_GET_PRIVATE(obj) \
+ ((GimpAspectPreviewPrivate *) gimp_aspect_preview_get_instance_private ((GimpAspectPreview *) (preview)))
+
+static void gimp_aspect_preview_constructed (GObject *object);
+static void gimp_aspect_preview_dispose (GObject *object);
+static void gimp_aspect_preview_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec);
+static void gimp_aspect_preview_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec);
+
+static void gimp_aspect_preview_style_set (GtkWidget *widget,
+ GtkStyle *prev_style);
+static void gimp_aspect_preview_draw (GimpPreview *preview);
+static void gimp_aspect_preview_draw_buffer (GimpPreview *preview,
+ const guchar *buffer,
+ gint rowstride);
+static void gimp_aspect_preview_transform (GimpPreview *preview,
+ gint src_x,
+ gint src_y,
+ gint *dest_x,
+ gint *dest_y);
+static void gimp_aspect_preview_untransform (GimpPreview *preview,
+ gint src_x,
+ gint src_y,
+ gint *dest_x,
+ gint *dest_y);
+
+static void gimp_aspect_preview_set_drawable (GimpAspectPreview *preview,
+ GimpDrawable *drawable);
+static void gimp_aspect_preview_set_drawable_id
+ (GimpAspectPreview *preview,
+ gint32 drawable_ID);
+
+
+G_DEFINE_TYPE_WITH_PRIVATE (GimpAspectPreview, gimp_aspect_preview,
+ GIMP_TYPE_PREVIEW)
+
+#define parent_class gimp_aspect_preview_parent_class
+
+static gint gimp_aspect_preview_counter = 0;
+
+
+static void
+gimp_aspect_preview_class_init (GimpAspectPreviewClass *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_aspect_preview_constructed;
+ object_class->dispose = gimp_aspect_preview_dispose;
+ object_class->get_property = gimp_aspect_preview_get_property;
+ object_class->set_property = gimp_aspect_preview_set_property;
+
+ widget_class->style_set = gimp_aspect_preview_style_set;
+
+ preview_class->draw = gimp_aspect_preview_draw;
+ preview_class->draw_buffer = gimp_aspect_preview_draw_buffer;
+ preview_class->transform = gimp_aspect_preview_transform;
+ preview_class->untransform = gimp_aspect_preview_untransform;
+
+ /**
+ * GimpAspectPreview: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));
+
+ /**
+ * GimpAspectPreview:drawable-id:
+ *
+ * The drawable the #GimpAspectPreview 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_aspect_preview_init (GimpAspectPreview *preview)
+{
+ g_object_set (GIMP_PREVIEW (preview)->area,
+ "check-size", gimp_check_size (),
+ "check-type", gimp_check_type (),
+ NULL);
+}
+
+static void
+gimp_aspect_preview_constructed (GObject *object)
+{
+ gchar *data_name;
+ PreviewSettings settings;
+
+ G_OBJECT_CLASS (parent_class)->constructed (object);
+
+ data_name = g_strdup_printf ("%s-aspect-preview-%d",
+ g_get_prgname (),
+ gimp_aspect_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-aspect-preview-data-name",
+ data_name, (GDestroyNotify) g_free);
+}
+
+static void
+gimp_aspect_preview_dispose (GObject *object)
+{
+ const gchar *data_name = g_object_get_data (G_OBJECT (object),
+ "gimp-aspect-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_aspect_preview_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ GimpAspectPreview *preview = GIMP_ASPECT_PREVIEW (object);
+ GimpAspectPreviewPrivate *priv = GIMP_ASPECT_PREVIEW_GET_PRIVATE (preview);
+
+ switch (property_id)
+ {
+ case PROP_DRAWABLE:
+ g_value_set_pointer (value, preview->drawable);
+ break;
+
+ case PROP_DRAWABLE_ID:
+ g_value_set_int (value, priv->drawable_ID);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_aspect_preview_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ GimpAspectPreview *preview = GIMP_ASPECT_PREVIEW (object);
+ GimpAspectPreviewPrivate *priv = GIMP_ASPECT_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_aspect_preview_set_drawable (preview,
+ g_value_get_pointer (value));
+ break;
+
+ case PROP_DRAWABLE_ID:
+ gimp_aspect_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_aspect_preview_style_set (GtkWidget *widget,
+ GtkStyle *prev_style)
+{
+ GimpPreview *preview = GIMP_PREVIEW (widget);
+ GimpAspectPreviewPrivate *priv = GIMP_ASPECT_PREVIEW_GET_PRIVATE (preview);
+ gint width;
+ gint height;
+ 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);
+
+ 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 void
+gimp_aspect_preview_draw (GimpPreview *preview)
+{
+ g_return_if_fail (GIMP_IS_ASPECT_PREVIEW (preview));
+
+ gimp_preview_area_fill (GIMP_PREVIEW_AREA (preview->area),
+ 0, 0,
+ preview->width,
+ preview->height,
+ 0, 0, 0);
+}
+
+static void
+gimp_aspect_preview_draw_buffer (GimpPreview *preview,
+ const guchar *buffer,
+ gint rowstride)
+{
+ GimpAspectPreviewPrivate *priv = GIMP_ASPECT_PREVIEW_GET_PRIVATE (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 (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;
+
+ selection_ID = gimp_image_get_selection (image_ID);
+
+ width = preview->width;
+ height = preview->height;
+
+ src = gimp_drawable_get_thumbnail_data (priv->drawable_ID,
+ &width, &height, &bpp);
+ sel = gimp_drawable_get_thumbnail_data (selection_ID,
+ &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_aspect_preview_transform (GimpPreview *preview,
+ gint src_x,
+ gint src_y,
+ gint *dest_x,
+ gint *dest_y)
+{
+ GimpAspectPreviewPrivate *priv = GIMP_ASPECT_PREVIEW_GET_PRIVATE (preview);
+
+ *dest_x = (gdouble) src_x * preview->width / gimp_drawable_width (priv->drawable_ID);
+ *dest_y = (gdouble) src_y * preview->height / gimp_drawable_height (priv->drawable_ID);
+}
+
+static void
+gimp_aspect_preview_untransform (GimpPreview *preview,
+ gint src_x,
+ gint src_y,
+ gint *dest_x,
+ gint *dest_y)
+{
+ GimpAspectPreviewPrivate *priv = GIMP_ASPECT_PREVIEW_GET_PRIVATE (preview);
+
+ *dest_x = (gdouble) src_x * gimp_drawable_width (priv->drawable_ID) / preview->width;
+ *dest_y = (gdouble) src_y * gimp_drawable_height (priv->drawable_ID) / preview->height;
+}
+
+static void
+gimp_aspect_preview_set_drawable (GimpAspectPreview *preview,
+ GimpDrawable *drawable)
+{
+ GimpAspectPreviewPrivate *priv = GIMP_ASPECT_PREVIEW_GET_PRIVATE (preview);
+
+ g_return_if_fail (preview->drawable == NULL);
+ g_return_if_fail (priv->drawable_ID < 1);
+
+ preview->drawable = drawable;
+
+ gimp_aspect_preview_set_drawable_id (preview, drawable->drawable_id);
+}
+
+static void
+gimp_aspect_preview_set_drawable_id (GimpAspectPreview *preview,
+ gint32 drawable_ID)
+{
+ GimpAspectPreviewPrivate *priv = GIMP_ASPECT_PREVIEW_GET_PRIVATE (preview);
+ gint d_width;
+ gint d_height;
+ gint width;
+ gint height;
+
+ g_return_if_fail (priv->drawable_ID < 1);
+
+ priv->drawable_ID = drawable_ID;
+
+ d_width = gimp_drawable_width (priv->drawable_ID);
+ d_height = gimp_drawable_height (priv->drawable_ID);
+
+ if (d_width > d_height)
+ {
+ width = MIN (d_width, 512);
+ height = (d_height * width) / d_width;
+ }
+ else
+ {
+ height = MIN (d_height, 512);
+ width = (d_width * height) / d_height;
+ }
+
+ gimp_preview_set_bounds (GIMP_PREVIEW (preview), 0, 0, width, height);
+
+ if (height > 0)
+ g_object_set (GIMP_PREVIEW (preview)->frame,
+ "ratio",
+ (gdouble) d_width / (gdouble) d_height,
+ NULL);
+}
+
+/**
+ * gimp_aspect_preview_new_from_drawable_id:
+ * @drawable_ID: a drawable ID
+ *
+ * Creates a new #GimpAspectPreview widget for @drawable_ID. See also
+ * gimp_drawable_preview_new_from_drawable_id().
+ *
+ * Since: 2.10
+ *
+ * Returns: a new #GimpAspectPreview.
+ **/
+GtkWidget *
+gimp_aspect_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_ASPECT_PREVIEW,
+ "drawable-id", drawable_ID,
+ NULL);
+}
+/**
+ * gimp_aspect_preview_new:
+ * @drawable: a #GimpDrawable
+ * @toggle: unused
+ *
+ * Creates a new #GimpAspectPreview widget for @drawable. See also
+ * gimp_drawable_preview_new().
+ *
+ * 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.
+ *
+ * Since: 2.2
+ *
+ * Returns: a new #GimpAspectPreview.
+ **/
+GtkWidget *
+gimp_aspect_preview_new (GimpDrawable *drawable,
+ gboolean *toggle)
+{
+ g_return_val_if_fail (drawable != NULL, NULL);
+
+ return g_object_new (GIMP_TYPE_ASPECT_PREVIEW,
+ "drawable", drawable,
+ NULL);
+}
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