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/*:*
* ggaze — image info / EXIF gather
*
* Gathers file info (via GFileInfo + GdkPixbuf for dims) and EXIF tags (via
* libexif) into a GgazeInfo struct. Plain-C, no GtkWidget.
*
* Copyright (c) 2026 ggaze contributors
* SPDX-License-Identifier: GPL-3.0-or-later
*:*/
#include "info.h"
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <libexif/exif-data.h>
#include <libexif/exif-tag.h>
static char *
_dup_exif_value(ExifData *p_data, ExifTag e_tag) {
if (p_data == NULL) {
return (NULL);
}
ExifEntry *p_entry = exif_data_get_entry(p_data, e_tag);
if (p_entry == NULL) {
return (NULL);
}
char c_buf[256];
exif_entry_get_value(p_entry, c_buf, sizeof(c_buf));
if (c_buf[0] == '\0') {
return (NULL);
}
return (g_strdup(c_buf));
}
static char *
_dup_camera(ExifData *p_data) {
char *c_make = _dup_exif_value(p_data, EXIF_TAG_MAKE);
char *c_model = _dup_exif_value(p_data, EXIF_TAG_MODEL);
char *c_out = NULL;
if (c_make != NULL && c_model != NULL) {
c_out = g_strdup_printf("%s %s", c_make, c_model);
} else if (c_make != NULL) {
c_out = g_strdup(c_make);
} else if (c_model != NULL) {
c_out = g_strdup(c_model);
}
g_free(c_make);
g_free(c_model);
return (c_out);
}
static int
_get_orientation(ExifData *p_data) {
if (p_data == NULL) {
return (0);
}
ExifEntry *p_entry = exif_data_get_entry(p_data, EXIF_TAG_ORIENTATION);
if (p_entry == NULL || p_entry->components == 0 || p_entry->data == NULL) {
return (0);
}
/* Orientation is a SHORT (2 bytes, big/little endian per the data's byte
* order). */
ExifByteOrder e_order = exif_data_get_byte_order(p_data);
return ((int)exif_get_short(p_entry->data, e_order));
}
GgazeInfo *
info_new(GFile *p_file) {
g_return_val_if_fail(G_IS_FILE(p_file), NULL);
char *c_path = g_file_get_path(p_file);
if (c_path == NULL) {
return (NULL);
}
GgazeInfo *p_info = g_new0(GgazeInfo, 1);
/* File info: size + content type. */
GError *p_err = NULL;
GFileInfo *p_fi =
g_file_query_info(p_file, "standard::size,standard::content-type",
G_FILE_QUERY_INFO_NONE, NULL, &p_err);
if (p_fi != NULL) {
p_info->i_size = (gint64)g_file_info_get_size(p_fi);
const char *c_ct = g_file_info_get_content_type(p_fi);
if (c_ct != NULL) {
p_info->c_format = g_strdup(c_ct);
}
g_object_unref(p_fi);
} else {
g_clear_error(&p_err);
}
/* Dimensions via GdkPixbuf (without applying orientation). */
GdkPixbuf *p_pix = gdk_pixbuf_new_from_file(c_path, &p_err);
if (p_pix != NULL) {
p_info->i_width = gdk_pixbuf_get_width(p_pix);
p_info->i_height = gdk_pixbuf_get_height(p_pix);
g_object_unref(p_pix);
} else {
g_clear_error(&p_err);
}
/* EXIF via libexif. */
ExifData *p_exif = exif_data_new_from_file(c_path);
if (p_exif != NULL) {
p_info->c_camera = _dup_camera(p_exif);
p_info->c_focal = _dup_exif_value(p_exif, EXIF_TAG_FOCAL_LENGTH);
p_info->c_aperture = _dup_exif_value(p_exif, EXIF_TAG_FNUMBER);
p_info->c_shutter = _dup_exif_value(p_exif, EXIF_TAG_EXPOSURE_TIME);
p_info->c_iso = _dup_exif_value(p_exif, EXIF_TAG_ISO_SPEED_RATINGS);
p_info->c_datetime = _dup_exif_value(p_exif, EXIF_TAG_DATE_TIME_ORIGINAL);
p_info->i_orientation = _get_orientation(p_exif);
exif_data_unref(p_exif);
}
g_free(c_path);
return (p_info);
}
void
info_delete(GgazeInfo *p_info) {
if (p_info == NULL) {
return;
}
g_free(p_info->c_format);
g_free(p_info->c_camera);
g_free(p_info->c_lens);
g_free(p_info->c_focal);
g_free(p_info->c_aperture);
g_free(p_info->c_shutter);
g_free(p_info->c_iso);
g_free(p_info->c_datetime);
g_free(p_info);
}
static char *
_join(GString *p_str, const char *c_label, const char *c_val) {
if (c_val != NULL && c_val[0] != '\0') {
g_string_append_printf(p_str, "%s: %s\n", c_label, c_val);
}
return (NULL);
}
char *
info_format(const GgazeInfo *p_info) {
if (p_info == NULL) {
return (g_strdup(""));
}
GString *p_str = g_string_new(NULL);
g_string_append_printf(p_str, "%d×%d\n", p_info->i_width, p_info->i_height);
_join(p_str, "Format", p_info->c_format);
if (p_info->i_size > 0) {
char *c_sz = g_format_size(p_info->i_size);
g_string_append_printf(p_str, "Size: %s\n", c_sz);
g_free(c_sz);
}
_join(p_str, "Camera", p_info->c_camera);
_join(p_str, "Lens", p_info->c_lens);
_join(p_str, "Focal", p_info->c_focal);
_join(p_str, "Aperture", p_info->c_aperture);
_join(p_str, "Shutter", p_info->c_shutter);
_join(p_str, "ISO", p_info->c_iso);
_join(p_str, "Date", p_info->c_datetime);
if (p_info->i_orientation > 0) {
g_string_append_printf(p_str, "Orientation: %d\n", p_info->i_orientation);
}
/* trim trailing newline */
if (p_str->len > 0 && p_str->str[p_str->len - 1] == '\n') {
g_string_truncate(p_str, p_str->len - 1);
}
return (g_string_free(p_str, FALSE));
}
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