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PIKApp/libpika/pikadrawablepreview.c

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/* LIBPIKA - The PIKA Library
* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
*
* pikadrawablepreview.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 "pikadrawablepreview.h"
/**
* SECTION: pikadrawablepreview
* @title: PikaDrawablePreview
* @short_description: A widget providing a preview of a #PikaDrawable.
*
* A widget providing a preview of a #PikaDrawable.
**/
#define SELECTION_BORDER 8
enum
{
PROP_0,
PROP_DRAWABLE
};
typedef struct
{
gint x;
gint y;
gboolean update;
} PreviewSettings;
struct _PikaDrawablePreviewPrivate
{
PikaDrawable *drawable;
};
#define GET_PRIVATE(obj) (((PikaDrawablePreview *) (obj))->priv)
static void pika_drawable_preview_constructed (GObject *object);
static void pika_drawable_preview_dispose (GObject *object);
static void pika_drawable_preview_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void pika_drawable_preview_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void pika_drawable_preview_style_updated (GtkWidget *widget);
static void pika_drawable_preview_draw_original (PikaPreview *preview);
static void pika_drawable_preview_draw_thumb (PikaPreview *preview,
PikaPreviewArea *area,
gint width,
gint height);
static void pika_drawable_preview_draw_buffer (PikaPreview *preview,
const guchar *buffer,
gint rowstride);
static void pika_drawable_preview_set_drawable (PikaDrawablePreview *preview,
PikaDrawable *drawable);
G_DEFINE_TYPE_WITH_PRIVATE (PikaDrawablePreview, pika_drawable_preview,
PIKA_TYPE_SCROLLED_PREVIEW)
#define parent_class pika_drawable_preview_parent_class
static gint pika_drawable_preview_counter = 0;
static void
pika_drawable_preview_class_init (PikaDrawablePreviewClass *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_drawable_preview_constructed;
object_class->dispose = pika_drawable_preview_dispose;
object_class->get_property = pika_drawable_preview_get_property;
object_class->set_property = pika_drawable_preview_set_property;
widget_class->style_updated = pika_drawable_preview_style_updated;
preview_class->draw = pika_drawable_preview_draw_original;
preview_class->draw_thumb = pika_drawable_preview_draw_thumb;
preview_class->draw_buffer = pika_drawable_preview_draw_buffer;
/**
* PikaDrawablePreview:drawable-id:
*
* The drawable the #PikaDrawablePreview 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_drawable_preview_init (PikaDrawablePreview *preview)
{
preview->priv = pika_drawable_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_drawable_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-drawable-preview-%d",
g_get_prgname (),
++pika_drawable_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);
pika_scrolled_preview_set_position (PIKA_SCROLLED_PREVIEW (object),
settings.x, settings.y);
}
g_bytes_unref (settings_bytes);
g_object_set_data_full (object, "pika-drawable-preview-data-name",
data_name, (GDestroyNotify) g_free);
}
static void
pika_drawable_preview_dispose (GObject *object)
{
PikaDrawablePreviewPrivate *priv = GET_PRIVATE (object);
const gchar *data_name;
data_name = g_object_get_data (G_OBJECT (object),
"pika-drawable-preview-data-name");
if (data_name)
{
PikaPreview *preview = PIKA_PREVIEW (object);
GBytes *bytes;
PreviewSettings settings;
pika_preview_get_position (preview, &settings.x, &settings.y);
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_drawable_preview_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
PikaDrawablePreview *preview = PIKA_DRAWABLE_PREVIEW (object);
switch (property_id)
{
case PROP_DRAWABLE:
g_value_set_object (value,
pika_drawable_preview_get_drawable (preview));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
pika_drawable_preview_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
PikaDrawablePreview *preview = PIKA_DRAWABLE_PREVIEW (object);
switch (property_id)
{
case PROP_DRAWABLE:
pika_drawable_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_drawable_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)
{
gint xmin, ymin;
gint xmax, ymax;
gint size;
pika_preview_get_bounds (preview, &xmin, &ymin, &xmax, &ymax);
gtk_widget_style_get (widget,
"size", &size,
NULL);
gtk_widget_set_size_request (area,
MIN (xmax - xmin, size),
MIN (ymax - ymin, size));
}
}
static void
pika_drawable_preview_draw_original (PikaPreview *preview)
{
PikaDrawablePreviewPrivate *priv = GET_PRIVATE (preview);
GBytes *buffer;
gint width, height;
gint tn_width, tn_height;
gint xoff, yoff;
gint xmin, ymin;
gint xmax, ymax;
gint bpp;
PikaImageType type;
if (priv->drawable == NULL)
return;
pika_preview_get_size (preview, &width, &height);
pika_preview_get_offsets (preview, &xoff, &yoff);
pika_preview_get_bounds (preview, &xmin, &ymin, &xmax, &ymax);
xoff = CLAMP (xoff, 0, xmax - xmin - width);
yoff = CLAMP (yoff, 0, ymax - ymin - height);
pika_preview_set_offsets (preview, xoff, yoff);
buffer = pika_drawable_get_sub_thumbnail_data (priv->drawable,
xoff + xmin,
yoff + ymin,
width, height,
width, height,
&tn_width, &tn_height, &bpp);
switch (bpp)
{
case 1: type = PIKA_GRAY_IMAGE; break;
case 2: type = PIKA_GRAYA_IMAGE; break;
case 3: type = PIKA_RGB_IMAGE; break;
case 4: type = PIKA_RGBA_IMAGE; break;
default:
g_bytes_unref (buffer);
return;
}
pika_preview_area_draw (PIKA_PREVIEW_AREA (pika_preview_get_area (preview)),
0, 0, tn_width, tn_height, type,
g_bytes_get_data (buffer, NULL), width * bpp);
g_bytes_unref (buffer);
}
static void
pika_drawable_preview_draw_thumb (PikaPreview *preview,
PikaPreviewArea *area,
gint width,
gint height)
{
PikaDrawablePreviewPrivate *priv = GET_PRIVATE (preview);
if (priv->drawable)
_pika_drawable_preview_area_draw_thumb (area, priv->drawable,
width, height);
}
void
_pika_drawable_preview_area_draw_thumb (PikaPreviewArea *area,
PikaDrawable *drawable,
gint width,
gint height)
{
GBytes *buffer;
gint x1, y1, x2, y2;
gint bpp;
gint size = 100;
gint nav_width, nav_height;
gint tn_width, tn_height;
g_return_if_fail (PIKA_IS_PREVIEW_AREA (area));
g_return_if_fail (pika_item_is_valid (PIKA_ITEM (drawable)));
g_return_if_fail (pika_item_is_drawable (PIKA_ITEM (drawable)));
if (_pika_drawable_preview_get_bounds (drawable, &x1, &y1, &x2, &y2))
{
width = x2 - x1;
height = y2 - y1;
}
else
{
width = pika_drawable_get_width (drawable);
height = pika_drawable_get_height (drawable);
}
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 (_pika_drawable_preview_get_bounds (drawable, &x1, &y1, &x2, &y2))
{
buffer = pika_drawable_get_sub_thumbnail_data (drawable,
x1, y1, x2 - x1, y2 - y1,
nav_width, nav_height,
&tn_width, &tn_height,
&bpp);
}
else
{
buffer = pika_drawable_get_thumbnail_data (drawable,
nav_width, nav_height,
&tn_width, &tn_height,
&bpp);
}
if (buffer)
{
PikaImageType type;
gtk_widget_set_size_request (GTK_WIDGET (area), tn_width, tn_height);
gtk_widget_show (GTK_WIDGET (area));
gtk_widget_realize (GTK_WIDGET (area));
switch (bpp)
{
case 1: type = PIKA_GRAY_IMAGE; break;
case 2: type = PIKA_GRAYA_IMAGE; break;
case 3: type = PIKA_RGB_IMAGE; break;
case 4: type = PIKA_RGBA_IMAGE; break;
default:
g_bytes_unref (buffer);
return;
}
pika_preview_area_draw (area,
0, 0, tn_width, tn_height,
type,
g_bytes_get_data (buffer, NULL), bpp * tn_width);
g_bytes_unref (buffer);
}
}
static void
pika_drawable_preview_draw_area (PikaDrawablePreview *preview,
gint x,
gint y,
gint width,
gint height,
const guchar *buf,
gint rowstride)
{
PikaDrawablePreviewPrivate *priv = GET_PRIVATE (preview);
PikaPreview *pika_preview = PIKA_PREVIEW (preview);
GtkWidget *area = pika_preview_get_area (pika_preview);
PikaImage *image;
gint xmin, ymin;
gint xoff, yoff;
pika_preview_get_bounds (pika_preview, &xmin, &ymin, NULL, NULL);
pika_preview_get_offsets (pika_preview, &xoff, &yoff);
image = pika_item_get_image (PIKA_ITEM (priv->drawable));
if (pika_selection_is_empty (image))
{
pika_preview_area_draw (PIKA_PREVIEW_AREA (area),
x - xoff - xmin,
y - yoff - ymin,
width,
height,
pika_drawable_type (priv->drawable),
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;
pika_drawable_get_offsets (priv->drawable, &offset_x, &offset_y);
if (pika_drawable_mask_intersect (priv->drawable,
&mask_x, &mask_y,
&mask_width, &mask_height) &&
pika_rectangle_intersect (mask_x, mask_y,
mask_width, mask_height,
x, y, width, height,
&draw_x, &draw_y,
&draw_width, &draw_height))
{
PikaImageType type;
PikaSelection *selection;
GBytes *src;
GBytes *sel;
gint d_w, d_h, d_bpp;
gint s_w, s_h, s_bpp;
selection = pika_image_get_selection (image);
src = pika_drawable_get_sub_thumbnail_data (priv->drawable,
draw_x, draw_y,
draw_width, draw_height,
draw_width, draw_height,
&d_w, &d_h,
&d_bpp);
sel = pika_drawable_get_sub_thumbnail_data (PIKA_DRAWABLE (selection),
draw_x + offset_x,
draw_y + offset_y,
draw_width, draw_height,
draw_width, draw_height,
&s_w, &s_h,
&s_bpp);
switch (d_bpp)
{
case 1: type = PIKA_GRAY_IMAGE; break;
case 2: type = PIKA_GRAYA_IMAGE; break;
case 3: type = PIKA_RGB_IMAGE; break;
case 4: type = PIKA_RGBA_IMAGE; break;
default:
g_bytes_unref (sel);
g_bytes_unref (src);
return;
}
pika_preview_area_mask (PIKA_PREVIEW_AREA (area),
draw_x - xoff - xmin,
draw_y - yoff - ymin,
draw_width,
draw_height,
type,
g_bytes_get_data (src, NULL), draw_width * d_bpp,
(buf +
(draw_x - x) * d_bpp +
(draw_y - y) * d_w * d_bpp),
rowstride,
g_bytes_get_data (sel, NULL), s_w);
g_bytes_unref (sel);
g_bytes_unref (src);
}
}
}
static void
pika_drawable_preview_draw_buffer (PikaPreview *preview,
const guchar *buffer,
gint rowstride)
{
gint x, y;
gint width, height;
pika_preview_get_position (preview, &x, &y);
pika_preview_get_size (preview, &width, &height);
pika_drawable_preview_draw_area (PIKA_DRAWABLE_PREVIEW (preview),
x, y,
width, height,
buffer, rowstride);
}
static void
pika_drawable_preview_set_drawable (PikaDrawablePreview *drawable_preview,
PikaDrawable *drawable)
{
PikaPreview *preview = PIKA_PREVIEW (drawable_preview);
PikaDrawablePreviewPrivate *priv = GET_PRIVATE (preview);
gint x1, y1, x2, y2;
g_return_if_fail (priv->drawable == NULL);
priv->drawable = drawable;
_pika_drawable_preview_get_bounds (drawable, &x1, &y1, &x2, &y2);
pika_preview_set_bounds (preview, x1, y1, x2, y2);
if (pika_drawable_is_indexed (drawable))
{
PikaImage *image = pika_item_get_image (PIKA_ITEM (drawable));
GtkWidget *area = pika_preview_get_area (preview);
guchar *cmap;
gint num_colors;
cmap = pika_image_get_colormap (image, NULL, &num_colors);
pika_preview_area_set_colormap (PIKA_PREVIEW_AREA (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
_pika_drawable_preview_get_bounds (PikaDrawable *drawable,
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 (pika_item_is_valid (PIKA_ITEM (drawable)), FALSE);
g_return_val_if_fail (pika_item_is_drawable (PIKA_ITEM (drawable)), FALSE);
width = pika_drawable_get_width (drawable);
height = pika_drawable_get_height (drawable);
retval = pika_drawable_mask_bounds (drawable, &x1, &y1, &x2, &y2);
pika_drawable_get_offsets (drawable, &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;
}
/**
* pika_drawable_preview_new_from_drawable:
* @drawable: (transfer none): a drawable
*
* Creates a new #PikaDrawablePreview widget for @drawable.
*
* Returns: A pointer to the new #PikaDrawablePreview widget.
*
* Since: 2.10
**/
GtkWidget *
pika_drawable_preview_new_from_drawable (PikaDrawable *drawable)
{
g_return_val_if_fail (pika_item_is_valid (PIKA_ITEM (drawable)), NULL);
g_return_val_if_fail (pika_item_is_drawable (PIKA_ITEM (drawable)), NULL);
return g_object_new (PIKA_TYPE_DRAWABLE_PREVIEW,
"drawable", drawable,
NULL);
}
/**
* pika_drawable_preview_get_drawable:
* @preview: a #PikaDrawablePreview widget
*
* Returns: (transfer none): the drawable that has been passed to
* pika_drawable_preview_new_from_drawable().
*
* Since: 2.10
**/
PikaDrawable *
pika_drawable_preview_get_drawable (PikaDrawablePreview *preview)
{
g_return_val_if_fail (PIKA_IS_DRAWABLE_PREVIEW (preview), NULL);
return GET_PRIVATE (preview)->drawable;
}
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