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PIKApp/app/core/pikaviewable.c

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Initial checkin of Pika from heckimp
2023-09-26 00:35:21 +02:00
/* PIKA - Photo and Image Kooker Application
* a rebranding of The GNU Image Manipulation Program (created with heckimp)
* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
*
* Original copyright, applying to most contents (license remains unchanged):
* Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
*
* pikaviewable.c
* Copyright (C) 2001 Michael Natterer <mitch@gimp.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <string.h>
#include <cairo.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <gegl.h>
#include "libpikabase/pikabase.h"
#include "libpikacolor/pikacolor.h"
#include "libpikamath/pikamath.h"
#include "libpikaconfig/pikaconfig.h"
#include "core-types.h"
#include "pika-memsize.h"
#include "pikacontainer.h"
#include "pikacontext.h"
#include "pikatempbuf.h"
#include "pikaviewable.h"
enum
{
PROP_0,
PROP_ICON_NAME,
PROP_ICON_PIXBUF,
PROP_FROZEN,
N_PROPS
};
static GParamSpec *obj_props[N_PROPS] = { NULL, };
enum
{
INVALIDATE_PREVIEW,
SIZE_CHANGED,
EXPANDED_CHANGED,
ANCESTRY_CHANGED,
LAST_SIGNAL
};
typedef struct _PikaViewablePrivate PikaViewablePrivate;
struct _PikaViewablePrivate
{
gchar *icon_name;
GdkPixbuf *icon_pixbuf;
gint freeze_count;
gboolean invalidate_pending;
gboolean size_changed_prending;
PikaViewable *parent;
gint depth;
PikaTempBuf *preview_temp_buf;
GdkPixbuf *preview_pixbuf;
};
#define GET_PRIVATE(viewable) ((PikaViewablePrivate *) pika_viewable_get_instance_private ((PikaViewable *) (viewable)))
static void pika_viewable_config_iface_init (PikaConfigInterface *iface);
static void pika_viewable_finalize (GObject *object);
static void pika_viewable_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void pika_viewable_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static gint64 pika_viewable_get_memsize (PikaObject *object,
gint64 *gui_size);
static void pika_viewable_real_invalidate_preview (PikaViewable *viewable);
static void pika_viewable_real_ancestry_changed (PikaViewable *viewable);
static GdkPixbuf * pika_viewable_real_get_new_pixbuf (PikaViewable *viewable,
PikaContext *context,
gint width,
gint height);
static void pika_viewable_real_get_preview_size (PikaViewable *viewable,
gint size,
gboolean popup,
gboolean dot_for_dot,
gint *width,
gint *height);
static gboolean pika_viewable_real_get_popup_size (PikaViewable *viewable,
gint width,
gint height,
gboolean dot_for_dot,
gint *popup_width,
gint *popup_height);
static gchar * pika_viewable_real_get_description (PikaViewable *viewable,
gchar **tooltip);
static gboolean pika_viewable_real_is_name_editable (PikaViewable *viewable);
static PikaContainer * pika_viewable_real_get_children (PikaViewable *viewable);
static gboolean pika_viewable_serialize_property (PikaConfig *config,
guint property_id,
const GValue *value,
GParamSpec *pspec,
PikaConfigWriter *writer);
static gboolean pika_viewable_deserialize_property (PikaConfig *config,
guint property_id,
GValue *value,
GParamSpec *pspec,
GScanner *scanner,
GTokenType *expected);
G_DEFINE_TYPE_WITH_CODE (PikaViewable, pika_viewable, PIKA_TYPE_OBJECT,
G_ADD_PRIVATE (PikaViewable)
G_IMPLEMENT_INTERFACE (PIKA_TYPE_CONFIG,
pika_viewable_config_iface_init))
#define parent_class pika_viewable_parent_class
static guint viewable_signals[LAST_SIGNAL] = { 0 };
static void
pika_viewable_class_init (PikaViewableClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
PikaObjectClass *pika_object_class = PIKA_OBJECT_CLASS (klass);
viewable_signals[INVALIDATE_PREVIEW] =
g_signal_new ("invalidate-preview",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (PikaViewableClass, invalidate_preview),
NULL, NULL, NULL,
G_TYPE_NONE, 0);
viewable_signals[SIZE_CHANGED] =
g_signal_new ("size-changed",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (PikaViewableClass, size_changed),
NULL, NULL, NULL,
G_TYPE_NONE, 0);
viewable_signals[EXPANDED_CHANGED] =
g_signal_new ("expanded-changed",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (PikaViewableClass, expanded_changed),
NULL, NULL, NULL,
G_TYPE_NONE, 0);
viewable_signals[ANCESTRY_CHANGED] =
g_signal_new ("ancestry-changed",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (PikaViewableClass, ancestry_changed),
NULL, NULL, NULL,
G_TYPE_NONE, 0);
object_class->finalize = pika_viewable_finalize;
object_class->get_property = pika_viewable_get_property;
object_class->set_property = pika_viewable_set_property;
pika_object_class->get_memsize = pika_viewable_get_memsize;
klass->default_icon_name = "dialog-question";
klass->name_changed_signal = "name-changed";
klass->name_editable = FALSE;
klass->invalidate_preview = pika_viewable_real_invalidate_preview;
klass->size_changed = NULL;
klass->expanded_changed = NULL;
klass->ancestry_changed = pika_viewable_real_ancestry_changed;
klass->get_size = NULL;
klass->get_preview_size = pika_viewable_real_get_preview_size;
klass->get_popup_size = pika_viewable_real_get_popup_size;
klass->get_preview = NULL;
klass->get_new_preview = NULL;
klass->get_pixbuf = NULL;
klass->get_new_pixbuf = pika_viewable_real_get_new_pixbuf;
klass->get_description = pika_viewable_real_get_description;
klass->is_name_editable = pika_viewable_real_is_name_editable;
klass->preview_freeze = NULL;
klass->preview_thaw = NULL;
klass->get_children = pika_viewable_real_get_children;
klass->set_expanded = NULL;
klass->get_expanded = NULL;
obj_props[PROP_ICON_NAME] =
g_param_spec_string ("icon-name", NULL, NULL,
NULL,
PIKA_CONFIG_PARAM_FLAGS);
obj_props[PROP_ICON_PIXBUF] =
g_param_spec_object ("icon-pixbuf", NULL, NULL,
GDK_TYPE_PIXBUF,
PIKA_CONFIG_PARAM_FLAGS);
obj_props[PROP_FROZEN] =
g_param_spec_boolean ("frozen", NULL, NULL,
FALSE,
PIKA_PARAM_READABLE);
g_object_class_install_properties (object_class, N_PROPS, obj_props);
}
static void
pika_viewable_init (PikaViewable *viewable)
{
}
static void
pika_viewable_config_iface_init (PikaConfigInterface *iface)
{
iface->deserialize_property = pika_viewable_deserialize_property;
iface->serialize_property = pika_viewable_serialize_property;
}
static void
pika_viewable_finalize (GObject *object)
{
PikaViewablePrivate *private = GET_PRIVATE (object);
g_clear_pointer (&private->icon_name, g_free);
g_clear_object (&private->icon_pixbuf);
g_clear_pointer (&private->preview_temp_buf, pika_temp_buf_unref);
g_clear_object (&private->preview_pixbuf);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
pika_viewable_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
PikaViewable *viewable = PIKA_VIEWABLE (object);
PikaViewablePrivate *private = GET_PRIVATE (object);
switch (property_id)
{
case PROP_ICON_NAME:
pika_viewable_set_icon_name (viewable, g_value_get_string (value));
break;
case PROP_ICON_PIXBUF:
if (private->icon_pixbuf)
g_object_unref (private->icon_pixbuf);
private->icon_pixbuf = g_value_dup_object (value);
pika_viewable_invalidate_preview (viewable);
break;
case PROP_FROZEN:
/* read-only, fall through */
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
pika_viewable_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
PikaViewable *viewable = PIKA_VIEWABLE (object);
PikaViewablePrivate *private = GET_PRIVATE (object);
switch (property_id)
{
case PROP_ICON_NAME:
g_value_set_string (value, pika_viewable_get_icon_name (viewable));
break;
case PROP_ICON_PIXBUF:
g_value_set_object (value, private->icon_pixbuf);
break;
case PROP_FROZEN:
g_value_set_boolean (value, pika_viewable_preview_is_frozen (viewable));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static gint64
pika_viewable_get_memsize (PikaObject *object,
gint64 *gui_size)
{
PikaViewablePrivate *private = GET_PRIVATE (object);
*gui_size += pika_temp_buf_get_memsize (private->preview_temp_buf);
if (private->preview_pixbuf)
{
*gui_size +=
(pika_g_object_get_memsize (G_OBJECT (private->preview_pixbuf)) +
(gsize) gdk_pixbuf_get_height (private->preview_pixbuf) *
gdk_pixbuf_get_rowstride (private->preview_pixbuf));
}
return PIKA_OBJECT_CLASS (parent_class)->get_memsize (object, gui_size);
}
static void
pika_viewable_real_invalidate_preview (PikaViewable *viewable)
{
PikaViewablePrivate *private = GET_PRIVATE (viewable);
g_clear_pointer (&private->preview_temp_buf, pika_temp_buf_unref);
g_clear_object (&private->preview_pixbuf);
}
static void
pika_viewable_real_ancestry_changed_propagate (PikaViewable *viewable,
PikaViewable *parent)
{
PikaViewablePrivate *private = GET_PRIVATE (viewable);
private->depth = pika_viewable_get_depth (parent) + 1;
g_signal_emit (viewable, viewable_signals[ANCESTRY_CHANGED], 0);
}
static void
pika_viewable_real_ancestry_changed (PikaViewable *viewable)
{
PikaContainer *children;
children = pika_viewable_get_children (viewable);
if (children)
{
pika_container_foreach (children,
(GFunc) pika_viewable_real_ancestry_changed_propagate,
viewable);
}
}
static void
pika_viewable_real_get_preview_size (PikaViewable *viewable,
gint size,
gboolean popup,
gboolean dot_for_dot,
gint *width,
gint *height)
{
*width = size;
*height = size;
}
static gboolean
pika_viewable_real_get_popup_size (PikaViewable *viewable,
gint width,
gint height,
gboolean dot_for_dot,
gint *popup_width,
gint *popup_height)
{
gint w, h;
if (pika_viewable_get_size (viewable, &w, &h))
{
if (w > width || h > height)
{
*popup_width = w;
*popup_height = h;
return TRUE;
}
}
return FALSE;
}
static GdkPixbuf *
pika_viewable_real_get_new_pixbuf (PikaViewable *viewable,
PikaContext *context,
gint width,
gint height)
{
PikaViewablePrivate *private = GET_PRIVATE (viewable);
GdkPixbuf *pixbuf = NULL;
PikaTempBuf *temp_buf;
temp_buf = pika_viewable_get_preview (viewable, context, width, height);
if (temp_buf)
{
pixbuf = pika_temp_buf_create_pixbuf (temp_buf);
}
else if (private->icon_pixbuf)
{
pixbuf = gdk_pixbuf_scale_simple (private->icon_pixbuf,
width,
height,
GDK_INTERP_BILINEAR);
}
return pixbuf;
}
static gchar *
pika_viewable_real_get_description (PikaViewable *viewable,
gchar **tooltip)
{
return g_strdup (pika_object_get_name (viewable));
}
static gboolean
pika_viewable_real_is_name_editable (PikaViewable *viewable)
{
return PIKA_VIEWABLE_GET_CLASS (viewable)->name_editable;
}
static PikaContainer *
pika_viewable_real_get_children (PikaViewable *viewable)
{
return NULL;
}
static gboolean
pika_viewable_serialize_property (PikaConfig *config,
guint property_id,
const GValue *value,
GParamSpec *pspec,
PikaConfigWriter *writer)
{
PikaViewablePrivate *private = GET_PRIVATE (config);
switch (property_id)
{
case PROP_ICON_NAME:
if (private->icon_name)
{
pika_config_writer_open (writer, pspec->name);
pika_config_writer_string (writer, private->icon_name);
pika_config_writer_close (writer);
}
return TRUE;
case PROP_ICON_PIXBUF:
{
GdkPixbuf *icon_pixbuf = g_value_get_object (value);
if (icon_pixbuf)
{
gchar *pixbuffer;
gsize pixbuffer_size;
GError *error = NULL;
if (gdk_pixbuf_save_to_buffer (icon_pixbuf,
&pixbuffer,
&pixbuffer_size,
"png", &error, NULL))
{
gchar *pixbuffer_enc;
pixbuffer_enc = g_base64_encode ((guchar *)pixbuffer,
pixbuffer_size);
pika_config_writer_open (writer, "icon-pixbuf");
pika_config_writer_string (writer, pixbuffer_enc);
pika_config_writer_close (writer);
g_free (pixbuffer_enc);
g_free (pixbuffer);
}
}
}
return TRUE;
default:
break;
}
return FALSE;
}
static gboolean
pika_viewable_deserialize_property (PikaConfig *config,
guint property_id,
GValue *value,
GParamSpec *pspec,
GScanner *scanner,
GTokenType *expected)
{
switch (property_id)
{
case PROP_ICON_PIXBUF:
{
GdkPixbuf *icon_pixbuf = NULL;
gchar *encoded_image;
if (! pika_scanner_parse_string (scanner, &encoded_image))
{
*expected = G_TOKEN_STRING;
return TRUE;
}
if (encoded_image && strlen (encoded_image) > 0)
{
gsize out_len;
guchar *decoded_image = g_base64_decode (encoded_image, &out_len);
if (decoded_image)
{
GInputStream *stream;
stream = g_memory_input_stream_new_from_data (decoded_image,
out_len, NULL);
icon_pixbuf = gdk_pixbuf_new_from_stream (stream, NULL, NULL);
g_object_unref (stream);
g_free (decoded_image);
}
}
g_free (encoded_image);
g_value_take_object (value, icon_pixbuf);
}
return TRUE;
default:
break;
}
return FALSE;
}
/**
* pika_viewable_invalidate_preview:
* @viewable: a viewable object
*
* Causes any cached preview to be marked as invalid, so that a new
* preview will be generated at the next attempt to display one.
**/
void
pika_viewable_invalidate_preview (PikaViewable *viewable)
{
PikaViewablePrivate *private = GET_PRIVATE (viewable);
g_return_if_fail (PIKA_IS_VIEWABLE (viewable));
if (private->freeze_count == 0)
g_signal_emit (viewable, viewable_signals[INVALIDATE_PREVIEW], 0);
else
private->invalidate_pending = TRUE;
}
/**
* pika_viewable_size_changed:
* @viewable: a viewable object
*
* This function sends a signal that is handled at a lower level in the
* object hierarchy, and provides a mechanism by which objects derived
* from #PikaViewable can respond to size changes.
**/
void
pika_viewable_size_changed (PikaViewable *viewable)
{
PikaViewablePrivate *private = GET_PRIVATE (viewable);
g_return_if_fail (PIKA_IS_VIEWABLE (viewable));
if (private->freeze_count == 0)
g_signal_emit (viewable, viewable_signals[SIZE_CHANGED], 0);
else
private->size_changed_prending = TRUE;
}
/**
* pika_viewable_expanded_changed:
* @viewable: a viewable object
*
* This function sends a signal that is handled at a lower level in the
* object hierarchy, and provides a mechanism by which objects derived
* from #PikaViewable can respond to expanded state changes.
**/
void
pika_viewable_expanded_changed (PikaViewable *viewable)
{
g_return_if_fail (PIKA_IS_VIEWABLE (viewable));
g_signal_emit (viewable, viewable_signals[EXPANDED_CHANGED], 0);
}
/**
* pika_viewable_calc_preview_size:
* @aspect_width: unscaled width of the preview for an item.
* @aspect_height: unscaled height of the preview for an item.
* @width: maximum available width for scaled preview.
* @height: maximum available height for scaled preview.
* @dot_for_dot: if %TRUE, ignore any differences in axis resolution.
* @xresolution: resolution in the horizontal direction.
* @yresolution: resolution in the vertical direction.
* @return_width: place to return the calculated preview width.
* @return_height: place to return the calculated preview height.
* @scaling_up: returns %TRUE here if the calculated preview size
* is larger than the viewable itself.
*
* A utility function, for calculating the dimensions of a preview
* based on the information specified in the arguments. The arguments
* @aspect_width and @aspect_height are the dimensions of the unscaled
* preview. The arguments @width and @height represent the maximum
* width and height that the scaled preview must fit into. The
* preview is scaled to be as large as possible without exceeding
* these constraints.
*
* If @dot_for_dot is %TRUE, and @xresolution and @yresolution are
* different, then these results are corrected for the difference in
* resolution on the two axes, so that the requested aspect ratio
* applies to the appearance of the display rather than to pixel
* counts.
**/
void
pika_viewable_calc_preview_size (gint aspect_width,
gint aspect_height,
gint width,
gint height,
gboolean dot_for_dot,
gdouble xresolution,
gdouble yresolution,
gint *return_width,
gint *return_height,
gboolean *scaling_up)
{
gdouble xratio;
gdouble yratio;
if (aspect_width > aspect_height)
{
xratio = yratio = (gdouble) width / (gdouble) aspect_width;
}
else
{
xratio = yratio = (gdouble) height / (gdouble) aspect_height;
}
if (! dot_for_dot && xresolution != yresolution)
{
yratio *= xresolution / yresolution;
}
width = RINT (xratio * (gdouble) aspect_width);
height = RINT (yratio * (gdouble) aspect_height);
if (width < 1) width = 1;
if (height < 1) height = 1;
if (return_width) *return_width = width;
if (return_height) *return_height = height;
if (scaling_up) *scaling_up = (xratio > 1.0) || (yratio > 1.0);
}
gboolean
pika_viewable_get_size (PikaViewable *viewable,
gint *width,
gint *height)
{
PikaViewableClass *viewable_class;
gboolean retval = FALSE;
gint w = 0;
gint h = 0;
g_return_val_if_fail (PIKA_IS_VIEWABLE (viewable), FALSE);
viewable_class = PIKA_VIEWABLE_GET_CLASS (viewable);
if (viewable_class->get_size)
retval = viewable_class->get_size (viewable, &w, &h);
if (width) *width = w;
if (height) *height = h;
return retval;
}
/**
* pika_viewable_get_preview_size:
* @viewable: the object for which to calculate the preview size.
* @size: requested size for preview.
* @popup: %TRUE if the preview is intended for a popup window.
* @dot_for_dot: If %TRUE, ignore any differences in X and Y resolution.
* @width: (out) (optional): return location for the the calculated width.
* @height: (out) (optional): return location for the calculated height.
*
* Retrieve the size of a viewable's preview. By default, this
* simply returns the value of the @size argument for both the @width
* and @height, but this can be overridden in objects derived from
* #PikaViewable. If either the width or height exceeds
* #PIKA_VIEWABLE_MAX_PREVIEW_SIZE, they are silently truncated.
**/
void
pika_viewable_get_preview_size (PikaViewable *viewable,
gint size,
gboolean popup,
gboolean dot_for_dot,
gint *width,
gint *height)
{
gint w, h;
g_return_if_fail (PIKA_IS_VIEWABLE (viewable));
g_return_if_fail (size > 0);
PIKA_VIEWABLE_GET_CLASS (viewable)->get_preview_size (viewable, size,
popup, dot_for_dot,
&w, &h);
w = MIN (w, PIKA_VIEWABLE_MAX_PREVIEW_SIZE);
h = MIN (h, PIKA_VIEWABLE_MAX_PREVIEW_SIZE);
if (width) *width = w;
if (height) *height = h;
}
/**
* pika_viewable_get_popup_size:
* @viewable: the object for which to calculate the popup size.
* @width: the width of the preview from which the popup will be shown.
* @height: the height of the preview from which the popup will be shown.
* @dot_for_dot: If %TRUE, ignore any differences in X and Y resolution.
* @popup_width: (out) (optional): return location for the calculated popup
* width.
* @popup_height: (out) (optional): return location for the calculated popup
* height.
*
* Calculate the size of a viewable's preview, for use in making a
* popup. The arguments @width and @height specify the size of the
* preview from which the popup will be shown.
*
* Returns: Whether the viewable wants a popup to be shown. Usually
* %TRUE if the passed preview size is smaller than the viewable
* size, and %FALSE if the viewable completely fits into the
* original preview.
**/
gboolean
pika_viewable_get_popup_size (PikaViewable *viewable,
gint width,
gint height,
gboolean dot_for_dot,
gint *popup_width,
gint *popup_height)
{
gint w, h;
g_return_val_if_fail (PIKA_IS_VIEWABLE (viewable), FALSE);
if (PIKA_VIEWABLE_GET_CLASS (viewable)->get_popup_size (viewable,
width, height,
dot_for_dot,
&w, &h))
{
if (w < 1) w = 1;
if (h < 1) h = 1;
/* limit the popup to 2 * PIKA_VIEWABLE_MAX_POPUP_SIZE
* on each axis.
*/
if ((w > (2 * PIKA_VIEWABLE_MAX_POPUP_SIZE)) ||
(h > (2 * PIKA_VIEWABLE_MAX_POPUP_SIZE)))
{
pika_viewable_calc_preview_size (w, h,
2 * PIKA_VIEWABLE_MAX_POPUP_SIZE,
2 * PIKA_VIEWABLE_MAX_POPUP_SIZE,
dot_for_dot, 1.0, 1.0,
&w, &h, NULL);
}
/* limit the number of pixels to
* PIKA_VIEWABLE_MAX_POPUP_SIZE ^ 2
*/
if ((w * h) > SQR (PIKA_VIEWABLE_MAX_POPUP_SIZE))
{
gdouble factor;
factor = sqrt (((gdouble) (w * h) /
(gdouble) SQR (PIKA_VIEWABLE_MAX_POPUP_SIZE)));
w = RINT ((gdouble) w / factor);
h = RINT ((gdouble) h / factor);
}
if (w < 1) w = 1;
if (h < 1) h = 1;
if (popup_width) *popup_width = w;
if (popup_height) *popup_height = h;
return TRUE;
}
return FALSE;
}
/**
* pika_viewable_get_preview:
* @viewable: The viewable object to get a preview for.
* @context: The context to render the preview for.
* @width: desired width for the preview
* @height: desired height for the preview
*
* Gets a preview for a viewable object, by running through a variety
* of methods until it finds one that works. First, if an
* implementation exists of a "get_preview" method, it is tried, and
* the result is returned if it is not %NULL. Second, the function
* checks to see whether there is a cached preview with the correct
* dimensions; if so, it is returned. If neither of these works, then
* the function looks for an implementation of the "get_new_preview"
* method, and executes it, caching the result. If everything fails,
* %NULL is returned.
*
* Returns: (nullable): A #PikaTempBuf containing the preview image, or %NULL if
* none can be found or created.
**/
PikaTempBuf *
pika_viewable_get_preview (PikaViewable *viewable,
PikaContext *context,
gint width,
gint height)
{
PikaViewablePrivate *private = GET_PRIVATE (viewable);
PikaViewableClass *viewable_class;
PikaTempBuf *temp_buf = NULL;
g_return_val_if_fail (PIKA_IS_VIEWABLE (viewable), NULL);
g_return_val_if_fail (context == NULL || PIKA_IS_CONTEXT (context), NULL);
g_return_val_if_fail (width > 0, NULL);
g_return_val_if_fail (height > 0, NULL);
if (G_UNLIKELY (context == NULL))
g_warning ("%s: context is NULL", G_STRFUNC);
viewable_class = PIKA_VIEWABLE_GET_CLASS (viewable);
if (viewable_class->get_preview)
temp_buf = viewable_class->get_preview (viewable, context, width, height);
if (temp_buf)
return temp_buf;
if (private->preview_temp_buf)
{
if (pika_temp_buf_get_width (private->preview_temp_buf) == width &&
pika_temp_buf_get_height (private->preview_temp_buf) == height)
{
return private->preview_temp_buf;
}
g_clear_pointer (&private->preview_temp_buf, pika_temp_buf_unref);
}
if (viewable_class->get_new_preview)
temp_buf = viewable_class->get_new_preview (viewable, context,
width, height);
private->preview_temp_buf = temp_buf;
return temp_buf;
}
/**
* pika_viewable_get_new_preview:
* @viewable: The viewable object to get a preview for.
* @width: desired width for the preview
* @height: desired height for the preview
*
* Gets a new preview for a viewable object. Similar to
* pika_viewable_get_preview(), except that it tries things in a
* different order, first looking for a "get_new_preview" method, and
* then if that fails for a "get_preview" method. This function does
* not look for a cached preview.
*
* Returns: (nullable): A #PikaTempBuf containing the preview image, or %NULL if
* none can be found or created.
**/
PikaTempBuf *
pika_viewable_get_new_preview (PikaViewable *viewable,
PikaContext *context,
gint width,
gint height)
{
PikaViewableClass *viewable_class;
PikaTempBuf *temp_buf = NULL;
g_return_val_if_fail (PIKA_IS_VIEWABLE (viewable), NULL);
g_return_val_if_fail (context == NULL || PIKA_IS_CONTEXT (context), NULL);
g_return_val_if_fail (width > 0, NULL);
g_return_val_if_fail (height > 0, NULL);
if (G_UNLIKELY (context == NULL))
g_warning ("%s: context is NULL", G_STRFUNC);
viewable_class = PIKA_VIEWABLE_GET_CLASS (viewable);
if (viewable_class->get_new_preview)
temp_buf = viewable_class->get_new_preview (viewable, context,
width, height);
if (temp_buf)
return temp_buf;
if (viewable_class->get_preview)
temp_buf = viewable_class->get_preview (viewable, context,
width, height);
if (temp_buf)
return pika_temp_buf_copy (temp_buf);
return NULL;
}
/**
* pika_viewable_get_dummy_preview:
* @viewable: viewable object for which to get a dummy preview.
* @width: width of the preview.
* @height: height of the preview.
* @bpp: bytes per pixel for the preview, must be 3 or 4.
*
* Creates a dummy preview the fits into the specified dimensions,
* containing a default "question" symbol. This function is used to
* generate a preview in situations where layer previews have been
* disabled in the current Pika configuration.
*
* Returns: a #PikaTempBuf containing the preview image.
**/
PikaTempBuf *
pika_viewable_get_dummy_preview (PikaViewable *viewable,
gint width,
gint height,
const Babl *format)
{
GdkPixbuf *pixbuf;
PikaTempBuf *buf;
g_return_val_if_fail (PIKA_IS_VIEWABLE (viewable), NULL);
g_return_val_if_fail (width > 0, NULL);
g_return_val_if_fail (height > 0, NULL);
g_return_val_if_fail (format != NULL, NULL);
pixbuf = pika_viewable_get_dummy_pixbuf (viewable, width, height,
babl_format_has_alpha (format));
buf = pika_temp_buf_new_from_pixbuf (pixbuf, format);
g_object_unref (pixbuf);
return buf;
}
/**
* pika_viewable_get_pixbuf:
* @viewable: The viewable object to get a pixbuf preview for.
* @context: The context to render the preview for.
* @width: desired width for the preview
* @height: desired height for the preview
*
* Gets a preview for a viewable object, by running through a variety
* of methods until it finds one that works. First, if an
* implementation exists of a "get_pixbuf" method, it is tried, and
* the result is returned if it is not %NULL. Second, the function
* checks to see whether there is a cached preview with the correct
* dimensions; if so, it is returned. If neither of these works, then
* the function looks for an implementation of the "get_new_pixbuf"
* method, and executes it, caching the result. If everything fails,
* %NULL is returned.
*
* Returns: (nullable): A #GdkPixbuf containing the preview pixbuf,
* or %NULL if none can be found or created.
**/
GdkPixbuf *
pika_viewable_get_pixbuf (PikaViewable *viewable,
PikaContext *context,
gint width,
gint height)
{
PikaViewablePrivate *private = GET_PRIVATE (viewable);
PikaViewableClass *viewable_class;
GdkPixbuf *pixbuf = NULL;
g_return_val_if_fail (PIKA_IS_VIEWABLE (viewable), NULL);
g_return_val_if_fail (context == NULL || PIKA_IS_CONTEXT (context), NULL);
g_return_val_if_fail (width > 0, NULL);
g_return_val_if_fail (height > 0, NULL);
if (G_UNLIKELY (context == NULL))
g_warning ("%s: context is NULL", G_STRFUNC);
viewable_class = PIKA_VIEWABLE_GET_CLASS (viewable);
if (viewable_class->get_pixbuf)
pixbuf = viewable_class->get_pixbuf (viewable, context, width, height);
if (pixbuf)
return pixbuf;
if (private->preview_pixbuf)
{
if (gdk_pixbuf_get_width (private->preview_pixbuf) == width &&
gdk_pixbuf_get_height (private->preview_pixbuf) == height)
{
return private->preview_pixbuf;
}
g_clear_object (&private->preview_pixbuf);
}
if (viewable_class->get_new_pixbuf)
pixbuf = viewable_class->get_new_pixbuf (viewable, context, width, height);
private->preview_pixbuf = pixbuf;
return pixbuf;
}
/**
* pika_viewable_get_new_pixbuf:
* @viewable: The viewable object to get a new pixbuf preview for.
* @context: The context to render the preview for.
* @width: desired width for the pixbuf
* @height: desired height for the pixbuf
*
* Gets a new preview for a viewable object. Similar to
* pika_viewable_get_pixbuf(), except that it tries things in a
* different order, first looking for a "get_new_pixbuf" method, and
* then if that fails for a "get_pixbuf" method. This function does
* not look for a cached pixbuf.
*
* Returns: (nullable): A #GdkPixbuf containing the preview,
* or %NULL if none can be created.
**/
GdkPixbuf *
pika_viewable_get_new_pixbuf (PikaViewable *viewable,
PikaContext *context,
gint width,
gint height)
{
PikaViewableClass *viewable_class;
GdkPixbuf *pixbuf = NULL;
g_return_val_if_fail (PIKA_IS_VIEWABLE (viewable), NULL);
g_return_val_if_fail (context == NULL || PIKA_IS_CONTEXT (context), NULL);
g_return_val_if_fail (width > 0, NULL);
g_return_val_if_fail (height > 0, NULL);
if (G_UNLIKELY (context == NULL))
g_warning ("%s: context is NULL", G_STRFUNC);
viewable_class = PIKA_VIEWABLE_GET_CLASS (viewable);
if (viewable_class->get_new_pixbuf)
pixbuf = viewable_class->get_new_pixbuf (viewable, context, width, height);
if (pixbuf)
return pixbuf;
if (viewable_class->get_pixbuf)
pixbuf = viewable_class->get_pixbuf (viewable, context, width, height);
if (pixbuf)
return gdk_pixbuf_copy (pixbuf);
return NULL;
}
/**
* pika_viewable_get_dummy_pixbuf:
* @viewable: the viewable object for which to create a dummy representation.
* @width: maximum permitted width for the pixbuf.
* @height: maximum permitted height for the pixbuf.
* @bpp: bytes per pixel for the pixbuf, must equal 3 or 4.
*
* Creates a pixbuf containing a default "question" symbol, sized to
* fit into the specified dimensions. The depth of the pixbuf must be
* 3 or 4 because #GdkPixbuf does not support grayscale. This
* function is used to generate a preview in situations where
* previewing has been disabled in the current Pika configuration.
* [Note: this function is currently unused except internally to
* #PikaViewable -- consider making it static?]
*
* Returns: the created #GdkPixbuf.
**/
GdkPixbuf *
pika_viewable_get_dummy_pixbuf (PikaViewable *viewable,
gint width,
gint height,
gboolean with_alpha)
{
GdkPixbuf *icon;
GdkPixbuf *pixbuf;
GError *error = NULL;
gdouble ratio;
gint w, h;
g_return_val_if_fail (PIKA_IS_VIEWABLE (viewable), NULL);
g_return_val_if_fail (width > 0, NULL);
g_return_val_if_fail (height > 0, NULL);
icon = gdk_pixbuf_new_from_resource ("/technology.heckin/icons/64/dialog-question.png",
&error);
if (! icon)
{
g_critical ("Failed to create icon image: %s", error->message);
g_clear_error (&error);
return NULL;
}
w = gdk_pixbuf_get_width (icon);
h = gdk_pixbuf_get_height (icon);
ratio = (gdouble) MIN (width, height) / (gdouble) MAX (w, h);
ratio = MIN (ratio, 1.0);
w = RINT (ratio * (gdouble) w);
h = RINT (ratio * (gdouble) h);
pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, with_alpha, 8, width, height);
gdk_pixbuf_fill (pixbuf, 0xffffffff);
if (w && h)
gdk_pixbuf_composite (icon, pixbuf,
(width - w) / 2, (height - h) / 2, w, h,
(width - w) / 2, (height - h) / 2, ratio, ratio,
GDK_INTERP_BILINEAR, 0xFF);
g_object_unref (icon);
return pixbuf;
}
/**
* pika_viewable_get_description:
* @viewable: viewable object for which to retrieve a description.
* @tooltip: (out) (optional) (nullable): return location for an optional
* tooltip string.
*
* Retrieves a string containing a description of the viewable object,
* By default, it simply returns the name of the object, but this can
* be overridden by object types that inherit from #PikaViewable.
*
* Returns: a copy of the description string. This should be freed
* when it is no longer needed.
**/
gchar *
pika_viewable_get_description (PikaViewable *viewable,
gchar **tooltip)
{
g_return_val_if_fail (PIKA_IS_VIEWABLE (viewable), NULL);
if (tooltip)
*tooltip = NULL;
return PIKA_VIEWABLE_GET_CLASS (viewable)->get_description (viewable,
tooltip);
}
/**
* pika_viewable_is_name_editable:
* @viewable: viewable object for which to retrieve a description.
*
* Returns: whether the viewable's name is editable by the user.
**/
gboolean
pika_viewable_is_name_editable (PikaViewable *viewable)
{
g_return_val_if_fail (PIKA_IS_VIEWABLE (viewable), FALSE);
return PIKA_VIEWABLE_GET_CLASS (viewable)->is_name_editable (viewable);
}
/**
* pika_viewable_get_icon_name:
* @viewable: viewable object for which to retrieve a icon name.
*
* Gets the current value of the object's icon name, for use in
* constructing an iconic representation of the object.
*
* Returns: a pointer to the string containing the icon name. The
* contents must not be altered or freed.
**/
const gchar *
pika_viewable_get_icon_name (PikaViewable *viewable)
{
PikaViewablePrivate *private = GET_PRIVATE (viewable);
g_return_val_if_fail (PIKA_IS_VIEWABLE (viewable), NULL);
if (private->icon_name)
return (const gchar *) private->icon_name;
return PIKA_VIEWABLE_GET_CLASS (viewable)->default_icon_name;
}
/**
* pika_viewable_set_icon_name:
* @viewable: viewable object to assign the specified icon name.
* @icon_name: string containing an icon name identifier.
*
* Set the object's icon name, for use in constructing iconic symbols
* of the object. The contents of @icon_name are copied, so you can
* free it when you are done with it.
**/
void
pika_viewable_set_icon_name (PikaViewable *viewable,
const gchar *icon_name)
{
PikaViewablePrivate *private = GET_PRIVATE (viewable);
PikaViewableClass *viewable_class;
g_return_if_fail (PIKA_IS_VIEWABLE (viewable));
g_clear_pointer (&private->icon_name, g_free);
viewable_class = PIKA_VIEWABLE_GET_CLASS (viewable);
if (icon_name)
{
if (viewable_class->default_icon_name == NULL ||
strcmp (icon_name, viewable_class->default_icon_name))
private->icon_name = g_strdup (icon_name);
}
pika_viewable_invalidate_preview (viewable);
g_object_notify_by_pspec (G_OBJECT (viewable), obj_props[PROP_ICON_NAME]);
}
void
pika_viewable_preview_freeze (PikaViewable *viewable)
{
PikaViewablePrivate *private = GET_PRIVATE (viewable);
g_return_if_fail (PIKA_IS_VIEWABLE (viewable));
private->freeze_count++;
if (private->freeze_count == 1)
{
if (PIKA_VIEWABLE_GET_CLASS (viewable)->preview_freeze)
PIKA_VIEWABLE_GET_CLASS (viewable)->preview_freeze (viewable);
g_object_notify_by_pspec (G_OBJECT (viewable), obj_props[PROP_FROZEN]);
}
}
void
pika_viewable_preview_thaw (PikaViewable *viewable)
{
PikaViewablePrivate *private = GET_PRIVATE (viewable);
g_return_if_fail (PIKA_IS_VIEWABLE (viewable));
g_return_if_fail (private->freeze_count > 0);
private->freeze_count--;
if (private->freeze_count == 0)
{
if (private->size_changed_prending)
{
private->size_changed_prending = FALSE;
pika_viewable_size_changed (viewable);
}
if (private->invalidate_pending)
{
private->invalidate_pending = FALSE;
pika_viewable_invalidate_preview (viewable);
}
g_object_notify_by_pspec (G_OBJECT (viewable), obj_props[PROP_FROZEN]);
if (PIKA_VIEWABLE_GET_CLASS (viewable)->preview_thaw)
PIKA_VIEWABLE_GET_CLASS (viewable)->preview_thaw (viewable);
}
}
gboolean
pika_viewable_preview_is_frozen (PikaViewable *viewable)
{
g_return_val_if_fail (PIKA_IS_VIEWABLE (viewable), FALSE);
return GET_PRIVATE (viewable)->freeze_count != 0;
}
PikaViewable *
pika_viewable_get_parent (PikaViewable *viewable)
{
g_return_val_if_fail (PIKA_IS_VIEWABLE (viewable), NULL);
return GET_PRIVATE (viewable)->parent;
}
void
pika_viewable_set_parent (PikaViewable *viewable,
PikaViewable *parent)
{
PikaViewablePrivate *private = GET_PRIVATE (viewable);
g_return_if_fail (PIKA_IS_VIEWABLE (viewable));
g_return_if_fail (parent == NULL || PIKA_IS_VIEWABLE (parent));
if (parent != private->parent)
{
private->parent = parent;
private->depth = parent ? pika_viewable_get_depth (parent) + 1 : 0;
g_signal_emit (viewable, viewable_signals[ANCESTRY_CHANGED], 0);
}
}
gint
pika_viewable_get_depth (PikaViewable *viewable)
{
g_return_val_if_fail (PIKA_IS_VIEWABLE (viewable), 0);
return GET_PRIVATE (viewable)->depth;
}
PikaContainer *
pika_viewable_get_children (PikaViewable *viewable)
{
g_return_val_if_fail (PIKA_IS_VIEWABLE (viewable), NULL);
return PIKA_VIEWABLE_GET_CLASS (viewable)->get_children (viewable);
}
gboolean
pika_viewable_get_expanded (PikaViewable *viewable)
{
g_return_val_if_fail (PIKA_IS_VIEWABLE (viewable), FALSE);
if (PIKA_VIEWABLE_GET_CLASS (viewable)->get_expanded)
return PIKA_VIEWABLE_GET_CLASS (viewable)->get_expanded (viewable);
return FALSE;
}
void
pika_viewable_set_expanded (PikaViewable *viewable,
gboolean expanded)
{
g_return_if_fail (PIKA_IS_VIEWABLE (viewable));
if (PIKA_VIEWABLE_GET_CLASS (viewable)->set_expanded)
PIKA_VIEWABLE_GET_CLASS (viewable)->set_expanded (viewable, expanded);
}
gboolean
pika_viewable_is_ancestor (PikaViewable *ancestor,
PikaViewable *descendant)
{
g_return_val_if_fail (PIKA_IS_VIEWABLE (ancestor), FALSE);
g_return_val_if_fail (PIKA_IS_VIEWABLE (descendant), FALSE);
while (descendant)
{
PikaViewable *parent = pika_viewable_get_parent (descendant);
if (parent == ancestor)
return TRUE;
descendant = parent;
}
return FALSE;
}