123 lines
4.4 KiB
C
123 lines
4.4 KiB
C
//
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// fiv-io.h: image operations
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//
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// Copyright (c) 2021, Přemysl Eric Janouch <p@janouch.name>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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//
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#pragma once
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#include <cairo.h>
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#include <gio/gio.h>
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#include <glib.h>
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extern const char *fiv_io_supported_media_types[];
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char **fiv_io_all_supported_media_types(void);
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// Userdata are typically attached to all Cairo surfaces in an animation.
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/// GBytes with plain Exif/TIFF data.
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extern cairo_user_data_key_t fiv_io_key_exif;
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/// FivIoOrientation, as a uintptr_t.
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extern cairo_user_data_key_t fiv_io_key_orientation;
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/// GBytes with plain ICC profile data.
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extern cairo_user_data_key_t fiv_io_key_icc;
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/// GBytes with plain XMP data.
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extern cairo_user_data_key_t fiv_io_key_xmp;
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/// The next frame in a sequence, as a surface, in a chain, pre-composited.
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/// There is no wrap-around.
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extern cairo_user_data_key_t fiv_io_key_frame_next;
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/// The previous frame in a sequence, as a surface, in a chain, pre-composited.
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/// This is a weak pointer that wraps around, and needn't be present
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/// for static images.
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extern cairo_user_data_key_t fiv_io_key_frame_previous;
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/// Frame duration in milliseconds as an intptr_t.
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extern cairo_user_data_key_t fiv_io_key_frame_duration;
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/// How many times to repeat the animation, or zero for +inf, as a uintptr_t.
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extern cairo_user_data_key_t fiv_io_key_loops;
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/// The first frame of the next page, as a surface, in a chain.
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/// There is no wrap-around.
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extern cairo_user_data_key_t fiv_io_key_page_next;
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/// The first frame of the previous page, as a surface, in a chain.
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/// There is no wrap-around. This is a weak pointer.
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extern cairo_user_data_key_t fiv_io_key_page_previous;
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cairo_surface_t *fiv_io_open(const gchar *path, GError **error);
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cairo_surface_t *fiv_io_open_from_data(
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const char *data, size_t len, const gchar *path, GError **error);
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int fiv_io_filecmp(GFile *f1, GFile *f2);
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// --- Export ------------------------------------------------------------------
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/// Requires libwebp.
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/// If no exact frame is specified, this potentially creates an animation.
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gboolean fiv_io_save(cairo_surface_t *page, cairo_surface_t *frame,
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const gchar *path, GError **error);
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// --- Metadata ----------------------------------------------------------------
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// https://www.cipa.jp/std/documents/e/DC-008-2012_E.pdf Table 6
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typedef enum _FivIoOrientation {
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FivIoOrientationUnknown = 0,
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FivIoOrientation0 = 1,
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FivIoOrientationMirror0 = 2,
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FivIoOrientation180 = 3,
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FivIoOrientationMirror180 = 4,
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FivIoOrientationMirror270 = 5,
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FivIoOrientation90 = 6,
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FivIoOrientationMirror90 = 7,
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FivIoOrientation270 = 8
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} FivIoOrientation;
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FivIoOrientation fiv_io_exif_orientation(const guint8 *exif, gsize len);
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/// Save metadata attached by this module in Exiv2 format.
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gboolean fiv_io_save_metadata(
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cairo_surface_t *page, const gchar *path, GError **error);
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// --- Thumbnails --------------------------------------------------------------
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// And this is how you avoid glib-mkenums.
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typedef enum _FivIoThumbnailSize {
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#define FIV_IO_THUMBNAIL_SIZES(XX) \
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XX(SMALL, 128, "normal") \
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XX(NORMAL, 256, "large") \
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XX(LARGE, 512, "x-large") \
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XX(HUGE, 1024, "xx-large")
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#define XX(name, value, dir) FIV_IO_THUMBNAIL_SIZE_ ## name,
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FIV_IO_THUMBNAIL_SIZES(XX)
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#undef XX
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FIV_IO_THUMBNAIL_SIZE_COUNT,
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FIV_IO_THUMBNAIL_SIZE_MIN = 0,
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FIV_IO_THUMBNAIL_SIZE_MAX = FIV_IO_THUMBNAIL_SIZE_COUNT - 1
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} FivIoThumbnailSize;
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GType fiv_io_thumbnail_size_get_type(void) G_GNUC_CONST;
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#define FIV_TYPE_IO_THUMBNAIL_SIZE (fiv_io_thumbnail_size_get_type())
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typedef struct _FivIoThumbnailSizeInfo {
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int size; ///< Nominal size in pixels
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const char *thumbnail_spec_name; ///< thumbnail-spec directory name
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} FivIoThumbnailSizeInfo;
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extern FivIoThumbnailSizeInfo
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fiv_io_thumbnail_sizes[FIV_IO_THUMBNAIL_SIZE_COUNT];
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cairo_surface_t *fiv_io_lookup_thumbnail(
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GFile *target, FivIoThumbnailSize size);
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