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/* Copyright 2009-2015 Yorba Foundation
*
* This software is licensed under the GNU LGPL (version 2.1 or later).
* See the COPYING file in this distribution.
*/
public class Thumbnail : MediaSourceItem {
// Collection properties Thumbnail responds to
// SHOW_TAGS (bool)
public const string PROP_SHOW_TAGS = CheckerboardItem.PROP_SHOW_SUBTITLES;
// SIZE (int, scale)
public const string PROP_SIZE = "thumbnail-size";
// SHOW_RATINGS (bool)
public const string PROP_SHOW_RATINGS = "show-ratings";
public static int MIN_SCALE {
get {
return 72;
}
}
public static int MAX_SCALE {
get {
return ThumbnailCache.Size.LARGEST.get_scale();
}
}
public static int DEFAULT_SCALE {
get {
return ThumbnailCache.Size.MEDIUM.get_scale();
}
}
public const Gdk.InterpType LOW_QUALITY_INTERP = Gdk.InterpType.NEAREST;
public const Gdk.InterpType HIGH_QUALITY_INTERP = Gdk.InterpType.BILINEAR;
private const int HQ_IMPROVEMENT_MSEC = 100;
private MediaSource media;
private int scale;
private Dimensions original_dim;
private Dimensions dim;
private Gdk.Pixbuf unscaled_pixbuf = null;
private Cancellable cancellable = null;
private bool hq_scheduled = false;
private bool hq_reschedule = false;
// this is cached locally because there are situations where the constant calls to is_exposed()
// was showing up in sysprof
private bool exposure = false;
public Thumbnail(MediaSource media, int scale = DEFAULT_SCALE) {
base (media, media.get_dimensions().get_scaled(scale, true), media.get_name(),
media.get_comment());
this.media = media;
this.scale = scale;
Tag.global.container_contents_altered.connect(on_tag_contents_altered);
Tag.global.items_altered.connect(on_tags_altered);
assert((media is LibraryPhoto) || (media is Video));
set_enable_sprockets(media is Video);
original_dim = media.get_dimensions();
dim = original_dim.get_scaled(scale, true);
// initialize title and tags text line so they're properly accounted for when the display
// size is calculated
update_title(true);
update_comment(true);
update_tags(true);
}
~Thumbnail() {
if (cancellable != null)
cancellable.cancel();
Tag.global.container_contents_altered.disconnect(on_tag_contents_altered);
Tag.global.items_altered.disconnect(on_tags_altered);
}
private void update_tags(bool init = false) {
Gee.Collection<Tag>? tags = Tag.global.fetch_sorted_for_source(media);
if (tags == null || tags.size == 0)
clear_subtitle();
else if (!init)
set_subtitle(Tag.make_tag_string(tags, "<small>", ", ", "</small>", true), true);
else
set_subtitle("<small>.</small>", true);
}
private void on_tag_contents_altered(ContainerSource container, Gee.Collection<DataSource>? added,
bool relinking, Gee.Collection<DataSource>? removed, bool unlinking) {
if (!exposure)
return;
bool tag_added = (added != null) ? added.contains(media) : false;
bool tag_removed = (removed != null) ? removed.contains(media) : false;
// if media source we're monitoring is added or removed to any tag, update tag list
if (tag_added || tag_removed)
update_tags();
}
private void on_tags_altered(Gee.Map<DataObject, Alteration> altered) {
if (!exposure)
return;
foreach (DataObject object in altered.keys) {
Tag tag = (Tag) object;
if (tag.contains(media)) {
update_tags();
break;
}
}
}
private void update_title(bool init = false) {
string title = media.get_name();
if (is_string_empty(title))
clear_title();
else if (!init)
set_title(title);
else
set_title("");
}
private void update_comment(bool init = false) {
string comment = media.get_comment();
if (is_string_empty(comment))
clear_comment();
else if (!init)
set_comment(comment);
else
set_comment("");
}
protected override void notify_altered(Alteration alteration) {
if (exposure && alteration.has_detail("metadata", "name"))
update_title();
if (exposure && alteration.has_detail("metadata", "comment"))
update_comment();
base.notify_altered(alteration);
}
public MediaSource get_media_source() {
return media;
}
//
// Comparators
//
public static int64 photo_id_ascending_comparator(void *a, void *b) {
return ((Thumbnail *) a)->media.get_instance_id() - ((Thumbnail *) b)->media.get_instance_id();
}
public static int64 photo_id_descending_comparator(void *a, void *b) {
return photo_id_ascending_comparator(b, a);
}
public static int64 title_ascending_comparator(void *a, void *b) {
int64 result = strcmp(((Thumbnail *) a)->get_natural_collation_key(), ((Thumbnail *) b)->get_natural_collation_key());
return (result != 0) ? result : photo_id_ascending_comparator(a, b);
}
public static int64 title_descending_comparator(void *a, void *b) {
int64 result = title_ascending_comparator(b, a);
return (result != 0) ? result : photo_id_descending_comparator(a, b);
}
public static bool title_comparator_predicate(DataObject object, Alteration alteration) {
return alteration.has_detail("metadata", "title");
}
public static int64 exposure_time_ascending_comparator(void *a, void *b) {
int64 time_a = (int64) (((Thumbnail *) a)->media.get_exposure_time());
int64 time_b = (int64) (((Thumbnail *) b)->media.get_exposure_time());
int64 result = (time_a - time_b);
return (result != 0) ? result : filename_ascending_comparator(a, b);
}
public static int64 exposure_time_desending_comparator(void *a, void *b) {
int64 result = exposure_time_ascending_comparator(b, a);
return (result != 0) ? result : filename_descending_comparator(a, b);
}
public static bool exposure_time_comparator_predicate(DataObject object, Alteration alteration) {
return alteration.has_detail("metadata", "exposure-time");
}
public static bool filename_comparator_predicate(DataObject object, Alteration alteration) {
return alteration.has_detail("metadata", "filename");
}
public static int64 filename_ascending_comparator(void *a, void *b) {
string path_a = ((Thumbnail *) a)->media.get_file().get_basename().down();
string path_b = ((Thumbnail *) b)->media.get_file().get_basename().down();
int64 result = strcmp(g_utf8_collate_key_for_filename(path_a),
g_utf8_collate_key_for_filename(path_b));
return (result != 0) ? result : photo_id_ascending_comparator(a, b);
}
public static int64 filename_descending_comparator(void *a, void *b) {
int64 result = filename_ascending_comparator(b, a);
return (result != 0) ? result : photo_id_descending_comparator(a, b);
}
public static int64 rating_ascending_comparator(void *a, void *b) {
int64 result = ((Thumbnail *) a)->media.get_rating() - ((Thumbnail *) b)->media.get_rating();
return (result != 0) ? result : photo_id_ascending_comparator(a, b);
}
public static int64 rating_descending_comparator(void *a, void *b) {
int64 result = rating_ascending_comparator(b, a);
return (result != 0) ? result : photo_id_descending_comparator(a, b);
}
public static bool rating_comparator_predicate(DataObject object, Alteration alteration) {
return alteration.has_detail("metadata", "rating");
}
protected override void thumbnail_altered() {
original_dim = media.get_dimensions();
dim = original_dim.get_scaled(scale, true);
if (exposure)
delayed_high_quality_fetch();
else
paint_empty();
base.thumbnail_altered();
}
protected override void notify_collection_property_set(string name, Value? old, Value val) {
switch (name) {
case PROP_SIZE:
resize((int) val);
break;
case PROP_SHOW_RATINGS:
notify_view_altered();
break;
}
base.notify_collection_property_set(name, old, val);
}
private void resize(int new_scale) {
assert(new_scale >= MIN_SCALE);
assert(new_scale <= MAX_SCALE);
if (scale == new_scale)
return;
scale = new_scale;
dim = original_dim.get_scaled(scale, true);
cancel_async_fetch();
if (exposure) {
// attempt to use an unscaled pixbuf (which is always larger or equal to the current
// size, and will most likely be larger than the new size -- and if not, a new one will
// be on its way), then use the current pixbuf if available (which may have to be
// scaled up, which is ugly)
Gdk.Pixbuf? resizable = null;
if (unscaled_pixbuf != null)
resizable = unscaled_pixbuf;
else if (has_image())
resizable = get_image();
if (resizable != null)
set_image(resize_pixbuf(resizable, dim, LOW_QUALITY_INTERP));
delayed_high_quality_fetch();
} else {
clear_image(dim);
}
}
private void paint_empty() {
cancel_async_fetch();
clear_image(dim);
unscaled_pixbuf = null;
}
private void schedule_low_quality_fetch() {
cancel_async_fetch();
cancellable = new Cancellable();
ThumbnailCache.fetch_async_scaled(media, ThumbnailCache.Size.SMALLEST,
dim, LOW_QUALITY_INTERP, on_low_quality_fetched, cancellable);
}
private void delayed_high_quality_fetch() {
if (hq_scheduled) {
hq_reschedule = true;
return;
}
Timeout.add_full(Priority.DEFAULT, HQ_IMPROVEMENT_MSEC, on_schedule_high_quality);
hq_scheduled = true;
}
private bool on_schedule_high_quality() {
if (hq_reschedule) {
hq_reschedule = false;
return true;
}
cancel_async_fetch();
cancellable = new Cancellable();
if (exposure) {
ThumbnailCache.fetch_async_scaled(media, scale, dim,
HIGH_QUALITY_INTERP, on_high_quality_fetched, cancellable);
}
hq_scheduled = false;
return false;
}
private void cancel_async_fetch() {
// cancel outstanding I/O
if (cancellable != null)
cancellable.cancel();
}
private void on_low_quality_fetched(Gdk.Pixbuf? pixbuf, Gdk.Pixbuf? unscaled, Dimensions dim,
Gdk.InterpType interp, Error? err) {
if (err != null)
critical("Unable to fetch low-quality thumbnail for %s (scale: %d): %s", to_string(), scale,
err.message);
if (pixbuf != null)
set_image(pixbuf);
if (unscaled != null)
unscaled_pixbuf = unscaled;
delayed_high_quality_fetch();
}
private void on_high_quality_fetched(Gdk.Pixbuf? pixbuf, Gdk.Pixbuf? unscaled, Dimensions dim,
Gdk.InterpType interp, Error? err) {
if (err != null)
critical("Unable to fetch high-quality thumbnail for %s (scale: %d): %s", to_string(), scale,
err.message);
if (pixbuf != null)
set_image(pixbuf);
if (unscaled != null)
unscaled_pixbuf = unscaled;
}
public override void exposed() {
exposure = true;
if (!has_image())
schedule_low_quality_fetch();
update_title();
update_comment();
update_tags();
base.exposed();
}
public override void unexposed() {
exposure = false;
paint_empty();
base.unexposed();
}
protected override Gdk.Pixbuf? get_top_right_trinket(int scale) {
Flaggable? flaggable = media as Flaggable;
return (flaggable != null && flaggable.is_flagged())
? Resources.get_icon(Resources.ICON_FLAGGED_TRINKET) : null;
}
protected override Gdk.Pixbuf? get_bottom_left_trinket(int scale) {
Rating rating = media.get_rating();
bool show_ratings = (bool) get_collection_property(PROP_SHOW_RATINGS, false);
return (rating != Rating.UNRATED && show_ratings)
? Resources.get_rating_trinket(rating, scale) : null;
}
}
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