ocarina/gui/artwork.c

/*
 * Copyright 2016 (c) Anna Schumaker.
 */
#include <core/audio.h>
#include <gui/builder.h>
#include <glib/gi18n.h>

#define ARTWORK_PREVIEW_SIZE 150

static struct album *__artwork_cur_album = NULL;
static unsigned int  __artwork_timeo_id  = 0;

static cairo_surface_t *__artwork_scale_pixbuf(GdkPixbuf *pix)
{
	int old_h = gdk_pixbuf_get_height(pix);
	int old_w = gdk_pixbuf_get_width(pix);
	int new_h = gui_builder_widget_height("o_position") +
		    gui_builder_widget_height("o_tags");
	int new_w = (old_w * new_h) / old_h;
	int scale = gtk_widget_get_scale_factor(gui_builder_widget("o_cover"));
	cairo_surface_t *orig    = gdk_cairo_surface_create_from_pixbuf(pix, 0,
									NULL);
	cairo_content_t  content = cairo_surface_get_content(orig);
	cairo_surface_t *new     = cairo_surface_create_similar(orig, content,
								new_w, new_h);
	cairo_t         *cairo   = cairo_create(new);

	cairo_scale(cairo, (double)(scale * new_w) / old_w,
			   (double)(scale * new_h) / old_h);
	cairo_set_source_surface(cairo, orig, 0, 0);
	cairo_paint(cairo);

	cairo_destroy(cairo);
	cairo_surface_destroy(orig);
	return new;
}

static cairo_surface_t *__artwork_get_surface(struct track *track)
{
	gchar *path = album_artwork_path(track->tr_album);
	cairo_surface_t *surface;
	GdkPixbuf *pix;

	if (!path)
		return NULL;

	pix = gdk_pixbuf_new_from_file(path, NULL);
	if (!pix)
		return NULL;
	surface = __artwork_scale_pixbuf(pix);

	g_object_unref(G_OBJECT(pix));
	g_free(path);
	return surface;
}

static bool __artwork_set_pixbuf(void)
{
	GtkImage *cover = GTK_IMAGE(gui_builder_widget("o_cover"));
	struct track *track = audio_cur_track();
	cairo_surface_t *surface;

	if (!track || track->tr_album == __artwork_cur_album)
		return true;

	surface = __artwork_get_surface(track);
	if (surface) {
		gtk_image_set_from_surface(cover, surface);
		cairo_surface_destroy(surface);
	} else
		gtk_image_set_from_icon_name(cover, "image-missing", GTK_ICON_SIZE_DIALOG);

	gtk_widget_set_sensitive(GTK_WIDGET(cover), surface != NULL);
	__artwork_cur_album = surface ? track->tr_album : NULL;
	return (surface != NULL);
}

static gboolean __artwork_timeout(gpointer data)
{
	if (__artwork_set_pixbuf()) {
		__artwork_timeo_id = 0;
		return G_SOURCE_REMOVE;
	}
	return G_SOURCE_CONTINUE;
}

void gui_artwork_set_cover(void)
{
	if (!__artwork_set_pixbuf() && __artwork_timeo_id == 0)
		__artwork_timeo_id = g_timeout_add(2000, __artwork_timeout, NULL);
}

void __artwork_update_preview(GtkFileChooser *chooser, gpointer data)
{
	GtkWidget *preview = gtk_file_chooser_get_preview_widget(chooser);
	gchar     *path    = gtk_file_chooser_get_preview_filename(chooser);
	GdkPixbuf *pix     = gdk_pixbuf_new_from_file(path, NULL);
	unsigned int old_w, scale;
	cairo_surface_t *surface;

	if (pix) {
		old_w   = gdk_pixbuf_get_width(pix);
		scale   = old_w / ARTWORK_PREVIEW_SIZE;
		surface = gdk_cairo_surface_create_from_pixbuf(pix, scale, NULL);
		if (surface) {
			gtk_image_set_from_surface(GTK_IMAGE(preview), surface);
			cairo_surface_destroy(surface);
		}
	}

	g_free(path);
}

void __artwork_select_cover(GtkButton *button)
{
	struct track *track = audio_cur_track();
	GtkFileFilter *filter;
	GtkWidget *dialog;
	GtkWidget *preview;
	gchar *path;

	if (!track)
		return;

	filter  = gtk_file_filter_new();
	preview = gtk_image_new_from_icon_name("", GTK_ICON_SIZE_DIALOG);
	dialog  = gtk_file_chooser_dialog_new("Choose an image",
				GTK_WINDOW(gui_builder_widget("o_window")),
				GTK_FILE_CHOOSER_ACTION_OPEN,
				_("_Cancel"), GTK_RESPONSE_CANCEL,
				_("_Open"),   GTK_RESPONSE_ACCEPT,
				NULL);

	gtk_file_filter_add_mime_type(filter, "image/*");
	gtk_file_chooser_set_filter(GTK_FILE_CHOOSER(dialog), filter);
	gtk_file_chooser_set_show_hidden(GTK_FILE_CHOOSER(dialog), true);
	gtk_file_chooser_set_preview_widget(GTK_FILE_CHOOSER(dialog), preview);
	gtk_file_chooser_set_use_preview_label(GTK_FILE_CHOOSER(dialog), false);

	g_signal_connect(dialog, "update-preview", (GCallback)__artwork_update_preview, NULL);

	if (gtk_dialog_run(GTK_DIALOG(dialog)) == GTK_RESPONSE_ACCEPT) {
		path = gtk_file_chooser_get_filename(GTK_FILE_CHOOSER(dialog));
		album_artwork_import(track->tr_album, path);
		__artwork_cur_album = NULL;
		gui_artwork_set_cover();
		g_free(path);
	}

	gtk_widget_destroy(dialog);
}