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//
// fiv-thumbnail.h: thumbnail management
//
// Copyright (c) 2021 - 2022, Přemysl Eric Janouch <p@janouch.name>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
//
#pragma once
#include <cairo.h>
#include <gio/gio.h>
#include <glib.h>
// And this is how you avoid glib-mkenums.
typedef enum _FivThumbnailSize {
#define FIV_THUMBNAIL_SIZES(XX) \
XX(SMALL, 128, "normal") \
XX(NORMAL, 256, "large") \
XX(LARGE, 512, "x-large") \
XX(HUGE, 1024, "xx-large")
#define XX(name, value, dir) FIV_THUMBNAIL_SIZE_ ## name,
FIV_THUMBNAIL_SIZES(XX)
#undef XX
FIV_THUMBNAIL_SIZE_COUNT,
FIV_THUMBNAIL_SIZE_MIN = 0,
FIV_THUMBNAIL_SIZE_MAX = FIV_THUMBNAIL_SIZE_COUNT - 1
} FivThumbnailSize;
GType fiv_thumbnail_size_get_type(void) G_GNUC_CONST;
#define FIV_TYPE_THUMBNAIL_SIZE (fiv_thumbnail_size_get_type())
typedef struct _FivThumbnailSizeInfo {
int size; ///< Nominal size in pixels
const char *thumbnail_spec_name; ///< thumbnail-spec directory name
} FivThumbnailSizeInfo;
enum { FIV_THUMBNAIL_WIDE_COEFFICIENT = 2 };
extern FivThumbnailSizeInfo fiv_thumbnail_sizes[FIV_THUMBNAIL_SIZE_COUNT];
/// If non-NULL, indicates a thumbnail of insufficient quality.
extern cairo_user_data_key_t fiv_thumbnail_key_lq;
/// Attempts to extract any low-quality thumbnail from fast targets.
/// If `max_size` is a valid value, the image will be downscaled as appropriate.
cairo_surface_t *fiv_thumbnail_extract(
GFile *target, FivThumbnailSize max_size, GError **error);
/// Generates wide thumbnails of up to the specified size, saves them in cache.
/// Returns the surface used for the maximum size, or an error.
cairo_surface_t *fiv_thumbnail_produce(
GFile *target, FivThumbnailSize max_size, GError **error);
/// Retrieves a thumbnail of the most appropriate quality and resolution
/// for the target file.
cairo_surface_t *fiv_thumbnail_lookup(
const char *uri, gint64 mtime_msec, FivThumbnailSize size);
/// Invalidate the wide thumbnail cache. May write to standard streams.
void fiv_thumbnail_invalidate(void);
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