Přemysl Eric Janouch
930744e165
It still needs no versioning, as it's not really used by anyone.
An alternative method of passing a "low-quality" flag would be
perusing fiv_thumbnail_key_lq from fiv-thumbnail.c, which would
create a circular dependency, unless fiv_io_{de,}serialize*()
were moved to fiv-thumbnail.c.
179 lines
7.2 KiB
C
179 lines
7.2 KiB
C
//
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// fiv-io.h: image operations
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//
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// Copyright (c) 2021 - 2022, 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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#include <webp/encode.h> // WebPConfig
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// --- Colour management -------------------------------------------------------
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// TODO(p): Make it possible to use Skia's skcms,
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// which also supports premultiplied alpha.
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// NOTE: Little CMS 2.13 will support premultiplied alpha in 2022.
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typedef void *FivIoProfile;
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FivIoProfile fiv_io_profile_new(const void *data, size_t len);
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FivIoProfile fiv_io_profile_new_sRGB(void);
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void fiv_io_profile_free(FivIoProfile self);
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// From libwebp, verified to exactly match [x * a / 255].
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#define PREMULTIPLY8(a, x) (((uint32_t) (x) * (uint32_t) (a) * 32897U) >> 23)
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// --- Loading -----------------------------------------------------------------
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extern const char *fiv_io_supported_media_types[];
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gchar **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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/// GBytes with a WebP's THUM chunk, used for our thumbnails.
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extern cairo_user_data_key_t fiv_io_key_thum;
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/// GHashTable with key-value pairs from PNG's tEXt, zTXt, iTXt chunks.
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/// Currently only read by fiv_io_open_png_thumbnail().
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extern cairo_user_data_key_t fiv_io_key_text;
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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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typedef struct _FivIoRenderClosure {
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/// The rendering is allowed to fail, returning NULL.
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cairo_surface_t *(*render)(struct _FivIoRenderClosure *, double scale);
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} FivIoRenderClosure;
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/// A FivIoRenderClosure for parametrized re-rendering of vector formats.
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/// This is attached at the page level.
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/// The rendered image will not have this key.
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extern cairo_user_data_key_t fiv_io_key_render;
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typedef struct {
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const char *uri; ///< Source URI
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FivIoProfile screen_profile; ///< Target colour space or NULL
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int screen_dpi; ///< Target DPI
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gboolean enhance; ///< Enhance JPEG (currently)
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gboolean first_frame_only; ///< Only interested in the 1st frame
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GPtrArray *warnings; ///< String vector for non-fatal errors
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} FivIoOpenContext;
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cairo_surface_t *fiv_io_open(const FivIoOpenContext *ctx, 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 FivIoOpenContext *ctx, GError **error);
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cairo_surface_t *fiv_io_open_png_thumbnail(const char *path, GError **error);
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// --- Thumbnail passing utilities ---------------------------------------------
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enum { FIV_IO_SERIALIZE_LOW_QUALITY = 1 << 0 };
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void fiv_io_serialize_to_stdout(cairo_surface_t *surface, guint64 user_data);
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cairo_surface_t *fiv_io_deserialize(GBytes *bytes, guint64 *user_data);
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// --- Filesystem --------------------------------------------------------------
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typedef enum _FivIoModelSort {
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FIV_IO_MODEL_SORT_NAME,
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FIV_IO_MODEL_SORT_MTIME,
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FIV_IO_MODEL_SORT_COUNT,
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FIV_IO_MODEL_SORT_MIN = 0,
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FIV_IO_MODEL_SORT_MAX = FIV_IO_MODEL_SORT_COUNT - 1
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} FivIoModelSort;
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#define FIV_TYPE_IO_MODEL (fiv_io_model_get_type())
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G_DECLARE_FINAL_TYPE(FivIoModel, fiv_io_model, FIV, IO_MODEL, GObject)
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/// Loads a directory. Clears itself even on failure.
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gboolean fiv_io_model_open(FivIoModel *self, GFile *directory, GError **error);
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/// Returns the current location as a GFile.
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/// There is no ownership transfer, and the object may be NULL.
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GFile *fiv_io_model_get_location(FivIoModel *self);
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typedef struct {
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gchar *uri; ///< GIO URI
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gchar *collate_key; ///< Collate key for the filename
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gint64 mtime_msec; ///< Modification time in milliseconds
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} FivIoModelEntry;
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const FivIoModelEntry *fiv_io_model_get_files(FivIoModel *self, gsize *len);
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const FivIoModelEntry *fiv_io_model_get_subdirs(FivIoModel *self, gsize *len);
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// --- Export ------------------------------------------------------------------
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/// Encodes a Cairo surface as a WebP bitstream, following the configuration.
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/// The result needs to be freed using WebPFree/WebPDataClear().
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unsigned char *fiv_io_encode_webp(
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cairo_surface_t *surface, const WebPConfig *config, size_t *len);
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/// Saves the page as a lossless WebP still picture or animation.
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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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FivIoProfile target, const char *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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/// Returns a rendering matrix for a surface, and its target dimensions.
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cairo_matrix_t fiv_io_orientation_apply(cairo_surface_t *surface,
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FivIoOrientation orientation, double *width, double *height);
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void fiv_io_orientation_dimensions(cairo_surface_t *surface,
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FivIoOrientation orientation, double *width, double *height);
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/// Extracts the orientation field from Exif, if there's any.
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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 char *path, GError **error);
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