PIKApp/libpika/pikaaspectpreview.c

445 lines
14 KiB
C

/* LIBPIKA - The PIKA Library
* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
*
* pikaaspectpreview.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 "libpikawidgets/pikawidgets.h"
#include "pikauitypes.h"
#include "pika.h"
#include "pikapdb-private.h"
#include "libpika-intl.h"
#include "pikaaspectpreview.h"
/**
* SECTION: pikaaspectpreview
* @title: PikaAspectPreview
* @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
};
struct _PikaAspectPreviewPrivate
{
PikaDrawable *drawable;
};
typedef struct
{
gboolean update;
} PreviewSettings;
#define GET_PRIVATE(obj) (((PikaAspectPreview *) (obj))->priv)
static void pika_aspect_preview_constructed (GObject *object);
static void pika_aspect_preview_dispose (GObject *object);
static void pika_aspect_preview_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void pika_aspect_preview_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void pika_aspect_preview_style_updated (GtkWidget *widget);
static void pika_aspect_preview_draw (PikaPreview *preview);
static void pika_aspect_preview_draw_buffer (PikaPreview *preview,
const guchar *buffer,
gint rowstride);
static void pika_aspect_preview_transform (PikaPreview *preview,
gint src_x,
gint src_y,
gint *dest_x,
gint *dest_y);
static void pika_aspect_preview_untransform (PikaPreview *preview,
gint src_x,
gint src_y,
gint *dest_x,
gint *dest_y);
static void pika_aspect_preview_set_drawable (PikaAspectPreview *preview,
PikaDrawable *drawable);
G_DEFINE_TYPE_WITH_PRIVATE (PikaAspectPreview, pika_aspect_preview,
PIKA_TYPE_PREVIEW)
#define parent_class pika_aspect_preview_parent_class
static gint pika_aspect_preview_counter = 0;
static void
pika_aspect_preview_class_init (PikaAspectPreviewClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
PikaPreviewClass *preview_class = PIKA_PREVIEW_CLASS (klass);
object_class->constructed = pika_aspect_preview_constructed;
object_class->dispose = pika_aspect_preview_dispose;
object_class->get_property = pika_aspect_preview_get_property;
object_class->set_property = pika_aspect_preview_set_property;
widget_class->style_updated = pika_aspect_preview_style_updated;
preview_class->draw = pika_aspect_preview_draw;
preview_class->draw_buffer = pika_aspect_preview_draw_buffer;
preview_class->transform = pika_aspect_preview_transform;
preview_class->untransform = pika_aspect_preview_untransform;
/**
* PikaAspectPreview:drawable-id:
*
* The drawable the #PikaAspectPreview is attached to.
*
* Since: 2.10
*/
g_object_class_install_property (object_class, PROP_DRAWABLE,
g_param_spec_object ("drawable",
"Drawable",
"The drawable this preview is attached to",
PIKA_TYPE_DRAWABLE,
PIKA_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY));
}
static void
pika_aspect_preview_init (PikaAspectPreview *preview)
{
preview->priv = pika_aspect_preview_get_instance_private (preview);
g_object_set (pika_preview_get_area (PIKA_PREVIEW (preview)),
"check-size", pika_check_size (),
"check-type", pika_check_type (),
"check-custom-color1", pika_check_custom_color1 (),
"check-custom-color2", pika_check_custom_color2 (),
NULL);
}
static void
pika_aspect_preview_constructed (GObject *object)
{
gchar *data_name;
PreviewSettings settings;
GBytes *settings_bytes = NULL;
G_OBJECT_CLASS (parent_class)->constructed (object);
data_name = g_strdup_printf ("%s-aspect-preview-%d",
g_get_prgname (),
pika_aspect_preview_counter++);
if (pika_pdb_get_data (data_name, &settings_bytes) &&
g_bytes_get_size (settings_bytes) == sizeof (PreviewSettings))
{
settings = *((PreviewSettings *) g_bytes_get_data (settings_bytes, NULL));
pika_preview_set_update (PIKA_PREVIEW (object), settings.update);
}
g_bytes_unref (settings_bytes);
g_object_set_data_full (object, "pika-aspect-preview-data-name",
data_name, (GDestroyNotify) g_free);
}
static void
pika_aspect_preview_dispose (GObject *object)
{
PikaAspectPreviewPrivate *priv = GET_PRIVATE (object);
const gchar *data_name;
data_name = g_object_get_data (G_OBJECT (object),
"pika-aspect-preview-data-name");
if (data_name)
{
PikaPreview *preview = PIKA_PREVIEW (object);
GBytes *bytes;
PreviewSettings settings;
settings.update = pika_preview_get_update (preview);
bytes = g_bytes_new_static (&settings, sizeof (PreviewSettings));
pika_pdb_set_data (data_name, bytes);
g_bytes_unref (bytes);
}
g_clear_object (&priv->drawable);
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
pika_aspect_preview_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
PikaAspectPreview *preview = PIKA_ASPECT_PREVIEW (object);
PikaAspectPreviewPrivate *priv = GET_PRIVATE (preview);
switch (property_id)
{
case PROP_DRAWABLE:
g_value_set_object (value, priv->drawable);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
pika_aspect_preview_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
PikaAspectPreview *preview = PIKA_ASPECT_PREVIEW (object);
switch (property_id)
{
case PROP_DRAWABLE:
pika_aspect_preview_set_drawable (preview, g_value_dup_object (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
pika_aspect_preview_style_updated (GtkWidget *widget)
{
PikaPreview *preview = PIKA_PREVIEW (widget);
GtkWidget *area = pika_preview_get_area (preview);
GTK_WIDGET_CLASS (parent_class)->style_updated (widget);
if (area)
{
PikaAspectPreviewPrivate *priv = GET_PRIVATE (preview);
gint width;
gint height;
gint preview_width;
gint preview_height;
gint size;
width = pika_drawable_get_width (priv->drawable);
height = pika_drawable_get_height (priv->drawable);
gtk_widget_style_get (widget,
"size", &size,
NULL);
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;
}
pika_preview_set_size (preview, preview_width, preview_height);
}
}
static void
pika_aspect_preview_draw (PikaPreview *preview)
{
GtkWidget *area = pika_preview_get_area (preview);
gint width;
gint height;
pika_preview_get_size (preview, &width, &height);
pika_preview_area_fill (PIKA_PREVIEW_AREA (area),
0, 0,
width, height,
0, 0, 0);
}
static void
pika_aspect_preview_draw_buffer (PikaPreview *preview,
const guchar *buffer,
gint rowstride)
{
PikaAspectPreviewPrivate *priv = GET_PRIVATE (preview);
GtkWidget *area = pika_preview_get_area (preview);
PikaImage *image;
gint width;
gint height;
pika_preview_get_size (preview, &width, &height);
image = pika_item_get_image (PIKA_ITEM (priv->drawable));
if (pika_selection_is_empty (image))
{
pika_preview_area_draw (PIKA_PREVIEW_AREA (area),
0, 0,
width, height,
pika_drawable_type (priv->drawable),
buffer,
rowstride);
}
else
{
GBytes *sel;
GBytes *src;
PikaSelection *selection;
gint w, h;
gint bpp;
selection = pika_image_get_selection (image);
src = pika_drawable_get_thumbnail_data (priv->drawable,
width, height,
&w, &h, &bpp);
sel = pika_drawable_get_thumbnail_data (PIKA_DRAWABLE (selection),
width, height,
&w, &h, &bpp);
pika_preview_area_mask (PIKA_PREVIEW_AREA (area),
0, 0, width, height,
pika_drawable_type (priv->drawable),
g_bytes_get_data (src, NULL),
width * pika_drawable_get_bpp (priv->drawable),
buffer, rowstride,
g_bytes_get_data (sel, NULL), width);
g_bytes_unref (sel);
g_bytes_unref (src);
}
}
static void
pika_aspect_preview_transform (PikaPreview *preview,
gint src_x,
gint src_y,
gint *dest_x,
gint *dest_y)
{
PikaAspectPreviewPrivate *priv = GET_PRIVATE (preview);
gint width;
gint height;
pika_preview_get_size (preview, &width, &height);
*dest_x = (gdouble) src_x * width / pika_drawable_get_width (priv->drawable);
*dest_y = (gdouble) src_y * height / pika_drawable_get_height (priv->drawable);
}
static void
pika_aspect_preview_untransform (PikaPreview *preview,
gint src_x,
gint src_y,
gint *dest_x,
gint *dest_y)
{
PikaAspectPreviewPrivate *priv = GET_PRIVATE (preview);
gint width;
gint height;
pika_preview_get_size (preview, &width, &height);
*dest_x = (gdouble) src_x * pika_drawable_get_width (priv->drawable) / width;
*dest_y = (gdouble) src_y * pika_drawable_get_height (priv->drawable) / height;
}
static void
pika_aspect_preview_set_drawable (PikaAspectPreview *preview,
PikaDrawable *drawable)
{
PikaAspectPreviewPrivate *priv = GET_PRIVATE (preview);
gint d_width;
gint d_height;
gint width;
gint height;
g_return_if_fail (priv->drawable == NULL);
priv->drawable = drawable;
d_width = pika_drawable_get_width (priv->drawable);
d_height = pika_drawable_get_height (priv->drawable);
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;
}
pika_preview_set_bounds (PIKA_PREVIEW (preview), 0, 0, width, height);
if (height > 0)
g_object_set (pika_preview_get_frame (PIKA_PREVIEW (preview)),
"ratio",
(gdouble) d_width / (gdouble) d_height,
NULL);
}
/**
* pika_aspect_preview_new_from_drawable:
* @drawable: (transfer none): a drawable
*
* Creates a new #PikaAspectPreview widget for @drawable_. See also
* pika_drawable_preview_new_from_drawable().
*
* Since: 2.10
*
* Returns: a new #PikaAspectPreview.
**/
GtkWidget *
pika_aspect_preview_new_from_drawable (PikaDrawable *drawable)
{
g_return_val_if_fail (PIKA_IS_DRAWABLE (drawable), NULL);
g_return_val_if_fail (pika_item_is_valid (PIKA_ITEM (drawable)), NULL);
return g_object_new (PIKA_TYPE_ASPECT_PREVIEW,
"drawable", drawable,
NULL);
}