bar_exif.c

Gqview,Linux下基于GTK+库写成的轻量级而能丰富的图像浏览程序。

/*
 * GQview
 * (C) 2004 John Ellis
 *
 * Author: John Ellis
 *
 * This software is released under the GNU General Public License (GNU GPL).
 * Please read the included file COPYING for more information.
 * This software comes with no warranty of any kind, use at your own risk!
 */


#include "gqview.h"
#include "bar_exif.h"

#include "exif.h"
#include "ui_bookmark.h"
#include "ui_misc.h"

#include <math.h>

#define EXIF_BAR_SIZE_INCREMENT 48
#define EXIF_BAR_ARROW_SIZE 7

#define EXIF_BAR_CUSTOM_COUNT 20

#define BAR_EXIF_DATA_COLUMN_WIDTH 250

static const gchar *bar_exif_key_list[] = {
	"fCamera",
	"fDateTime",
	"fShutterSpeed",
	"fAperture",
	"ExposureProgram",
	"fExposureBias",
	"fISOSpeedRating",
	"fFocalLength",
	"fSubjectDistance",
	"MeteringMode",
	"fFlash",
	"LightSource",
	"fResolution",
	"Orientation",
	"ImageDescription",
	"Copyright"
};

#define bar_exif_key_count (sizeof(bar_exif_key_list) / sizeof(gchar *))


/*
 *-------------------------------------------------------------------
 * table util
 *-------------------------------------------------------------------
 */

static void table_add_line_custom(GtkWidget *table, gint x, gint y,
                                  const gchar *text1, const gchar *text2,
                                  GtkWidget **label1, GtkWidget **label2)
{
	GtkWidget *label;
	gchar *buf;

	buf = g_strconcat((text1) ? text1 : "fixme", ":", NULL);
	if (!text2) text2 = "";

	label = gtk_label_new(buf);
	gtk_misc_set_alignment(GTK_MISC(label), 1.0, 0.0);
	pref_label_bold(label, TRUE, FALSE);
	gtk_table_attach(GTK_TABLE(table), label,
			 x, x + 1, y, y + 1,
			 GTK_FILL, GTK_FILL,
			 2, 2);
	*label1 = label;

	label = gtk_label_new(text2);
	gtk_misc_set_alignment(GTK_MISC(label), 0.0, 0.0);
	gtk_table_attach(GTK_TABLE(table), label,
			 x + 1, x + 2, y, y + 1,
			 GTK_FILL, GTK_FILL,
			 2, 2);
	*label2 = label;

	g_free(buf);
}

static GtkWidget *table_add_line(GtkWidget *table, gint x, gint y,
				 const gchar *description, const gchar *text)
{
	GtkWidget *key;
	GtkWidget *label;

	table_add_line_custom(table, x, y, description, text, &key, &label);
	gtk_widget_show(key);
	gtk_widget_show(label);

	return label;
}


/*
 *-------------------------------------------------------------------
 * EXIF bar
 *-------------------------------------------------------------------
 */

typedef struct _ExifBar ExifBar;
struct _ExifBar
{
	GtkWidget *vbox;
	GtkWidget *scrolled;
	GtkWidget *table;
	GtkWidget *advanced_scrolled;
	GtkWidget *listview;
	GtkWidget **labels;

	GtkWidget *custom_sep;
	GtkWidget *custom_name[EXIF_BAR_CUSTOM_COUNT];
	GtkWidget *custom_value[EXIF_BAR_CUSTOM_COUNT];

	gchar *path;

	gint allow_search;
};

enum {
	EXIF_ADVCOL_ENABLED = 0,
	EXIF_ADVCOL_TAG,
	EXIF_ADVCOL_NAME,
	EXIF_ADVCOL_VALUE,
	EXIF_ADVCOL_FORMAT,
	EXIF_ADVCOL_ELEMENTS,
	EXIF_ADVCOL_DESCRIPTION,
	EXIF_ADVCOL_COUNT
};

static gchar *bar_exif_validate_text(gchar *text)
{
	if (text && !g_utf8_validate(text, strlen(text), NULL))
		{
		gchar *tmp = text;
		text = g_convert(tmp, strlen(tmp), "UTF-8", "ISO-8859-1", NULL, NULL, NULL);
		g_free(tmp);
		}
	return text;
}

static void bar_exif_sensitive(ExifBar *eb, gint enable)
{
	gtk_widget_set_sensitive(eb->table, enable);
	if (eb->advanced_scrolled) gtk_widget_set_sensitive(eb->advanced_scrolled, enable);
}

static gint bar_exif_row_enabled(const gchar *name)
{
	GList *list;

	list = history_list_get_by_key("exif_extras");
	while (list)
		{
		if (name && strcmp(name, (gchar *)(list->data)) == 0) return TRUE;
		list = list->next;
	}

	return FALSE;
}

static void bar_exif_update(ExifBar *eb)
{
	ExifData *exif;
	gint len, i;

	exif = exif_read(eb->path);

	if (!exif)
		{
		bar_exif_sensitive(eb, FALSE);
		return;
		}

	bar_exif_sensitive(eb, TRUE);

	if (GTK_WIDGET_VISIBLE(eb->scrolled))
		{
		GList *list;
		len = bar_exif_key_count;
		for (i = 0; i < len; i++)
			{
			gchar *text;
			text = exif_get_data_as_text(exif, bar_exif_key_list[i]);
			text = bar_exif_validate_text(text);
			gtk_label_set_text(GTK_LABEL(eb->labels[i]), text);
			g_free(text);
			}

		list = g_list_last(history_list_get_by_key("exif_extras"));
		if (list)
			{
			gtk_widget_show(eb->custom_sep);
			}
		else
			{
			gtk_widget_hide(eb->custom_sep);
			}
		i = 0;
		while (list && i < EXIF_BAR_CUSTOM_COUNT)
			{
			gchar *text;
			gchar *name;
			gchar *buf;

			name = list->data;
			list = list->prev;

			text = exif_get_data_as_text(exif, name);
			text = bar_exif_validate_text(text);

			buf = g_strconcat(name, ":", NULL);
			gtk_label_set_text(GTK_LABEL(eb->custom_name[i]), buf);
			g_free(buf);
			gtk_label_set_text(GTK_LABEL(eb->custom_value[i]), text);
			g_free(text);

			gtk_widget_show(eb->custom_name[i]);
			gtk_widget_show(eb->custom_value[i]);

			i++;
			}
		while (i < EXIF_BAR_CUSTOM_COUNT)
			{
			gtk_widget_hide(eb->custom_name[i]);
			gtk_widget_hide(eb->custom_value[i]);
			i++;
			}
		}

	if (eb->advanced_scrolled && GTK_WIDGET_VISIBLE(eb->advanced_scrolled))
		{
		GtkListStore *store;
		GtkTreeIter iter;
		GList *work;
		
		store = GTK_LIST_STORE(gtk_tree_view_get_model(GTK_TREE_VIEW(eb->listview)));
		gtk_list_store_clear(store);

		work = exif->items;
		while (work)
			{
			ExifItem *item;
			gchar *tag;
			const gchar *tag_name;
			gchar *text;
			const gchar *format;
			gchar *elements;
			const gchar *description;

			item = work->data;
			work = work->next;

			tag = g_strdup_printf("0x%04x", item->tag);
			tag_name = exif_item_get_tag_name(item);
			format = exif_item_get_format_name(item, TRUE);
			text = exif_item_get_data_as_text(item);
			text = bar_exif_validate_text(text);
			elements = g_strdup_printf("%d", item->elements);
			description = exif_item_get_description(item);
			if (!description) description = "";
			gtk_list_store_append(store, &iter);
			gtk_list_store_set(store, &iter,
					EXIF_ADVCOL_ENABLED, bar_exif_row_enabled(tag_name),
					EXIF_ADVCOL_TAG, tag,
					EXIF_ADVCOL_NAME, tag_name,
					EXIF_ADVCOL_VALUE, text,
					EXIF_ADVCOL_FORMAT, format,
					EXIF_ADVCOL_ELEMENTS, elements,
					EXIF_ADVCOL_DESCRIPTION, description, -1);
			g_free(tag);
			g_free(text);
			g_free(elements);
			}
		}

	exif_free(exif);
}

static void bar_exif_clear(ExifBar *eb)
{
	gint len;
	gint i;

	if (!GTK_WIDGET_SENSITIVE(eb->labels[0])) return;

	len = bar_exif_key_count;
	for (i = 0; i < len; i++)
		{
		gtk_label_set_text(GTK_LABEL(eb->labels[i]), "");
		}
	for (i = 0; i < EXIF_BAR_CUSTOM_COUNT; i++)
		{
		gtk_label_set_text(GTK_LABEL(eb->custom_value[i]), "");
		}

	if (eb->listview)
		{
		GtkListStore *store;

		store = GTK_LIST_STORE(gtk_tree_view_get_model(GTK_TREE_VIEW(eb->listview)));
		gtk_list_store_clear(store);
		}
}

void bar_exif_set(GtkWidget *bar, const gchar *path)
{
	ExifBar *eb;

	eb = g_object_get_data(G_OBJECT(bar), "bar_exif_data");
	if (!eb) return;

	/* store this, advanced view toggle needs to reload data */
	g_free(eb->path);
	eb->path = g_strdup(path);

	bar_exif_clear(eb);
	bar_exif_update(eb);
}

static void bar_exif_row_toggled_cb(GtkCellRendererToggle *toggle, const gchar *path, gpointer data)
{
	GtkWidget *listview = data;
	GtkTreeModel *store;