mipmap_cache.h

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/*
    This file is part of darktable,
    Copyright (C) 2009-2014, 2016 johannes hanika.
    Copyright (C) 2012 Richard Wonka.
    Copyright (C) 2012, 2014-2016 Tobias Ellinghaus.
    Copyright (C) 2014-2015 Pedro Côrte-Real.
    Copyright (C) 2014-2016 Roman Lebedev.
    Copyright (C) 2019, 2021 Aldric Renaudin.
    Copyright (C) 2020-2021 Pascal Obry.
    Copyright (C) 2021 Ralf Brown.
    Copyright (C) 2022 Martin Bařinka.
    Copyright (C) 2025 Alynx Zhou.
    Copyright (C) 2025 Aurélien PIERRE.
    
    darktable is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
    
    darktable is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
    
    You should have received a copy of the GNU General Public License
    along with darktable.  If not, see <http://www.gnu.org/licenses/>.
*/
 
#ifndef DT_CACHES_MIPMAP_CACHE_H
#define DT_CACHES_MIPMAP_CACHE_H
 
#include "system/atomic.h"
#include "common/paths.h"   // DT_PATH_MAX
#include "caches/cache.h"
#include "colorprofiles/profile_types.h"
#include "common/image.h"
 
#ifdef __cplusplus
extern "C" {
#endif
 
// sizes stored in the mipmap cache, set to fixed values in mipmap_cache.c
typedef enum dt_mipmap_size_t {
  DT_MIPMAP_0,               // 360x225 px
  DT_MIPMAP_1,               // 720x450 px
  DT_MIPMAP_2,               // 1440x900 px
  DT_MIPMAP_3,               // Full HD 1080p
  DT_MIPMAP_4,               // 2560x1440 px
  DT_MIPMAP_5,               // 4K/UHD -
  DT_MIPMAP_6,               // 5K
  DT_MIPMAP_7,               // 6K
  DT_MIPMAP_8,               // 8K
  DT_MIPMAP_F,               // unprocessed input float image downscaled to 720x450 or 1440x900 px for performance
  DT_MIPMAP_FULL,            // unprocessed input float image at original resolation
  DT_MIPMAP_NONE
} dt_mipmap_size_t;
 
// type to be passed to getter functions
typedef enum dt_mipmap_get_flags_t
{
  // only return when the requested buffer is loaded.
  // blocks until that happens.
  DT_MIPMAP_BLOCKING = 0,
  // don't actually acquire the lock if it is not
  // in cache (i.e. would have to be loaded first)
  DT_MIPMAP_TESTLOCK = 1
} dt_mipmap_get_flags_t;
 
// struct to be alloc'ed by the client, filled by dt_mipmap_cache_get()
typedef struct dt_mipmap_buffer_t
{
  dt_mipmap_size_t size;
  int32_t imgid;
  int32_t width, height;
  float iscale;
  uint8_t *buf;
  dt_colorspaces_color_profile_type_t color_space;
  dt_cache_entry_t *cache_entry;
} dt_mipmap_buffer_t;
 
typedef struct dt_mipmap_cache_one_t dt_mipmap_cache_one_t;
 
/* The cache instance is a file-static in mipmap_cache.c and there is no accessor for it: no
 * function below takes one, so nothing outside needs the handle. The type survives only
 * because dt_mipmap_cache_one_t names it; both are opaque. */
typedef struct dt_mipmap_cache_t dt_mipmap_cache_t;
 
// dynamic memory allocation interface for imageio backend: a write locked
// mipmap buffer is passed in, it might already contain a valid buffer. this
// function takes care of re-allocating, if necessary.
void *dt_mipmap_cache_alloc(dt_mipmap_buffer_t *buf, const dt_image_t *img);
 
typedef struct dt_mipmap_cache_settings_t
{
  size_t max_memory;
  gboolean disk_backend;
  int embedded_jpg;
  int cache_quality;
} dt_mipmap_cache_settings_t;
 
void dt_mipmap_cache_set_settings(const dt_mipmap_cache_settings_t *settings);
 
void dt_mipmap_cache_get_settings(dt_mipmap_cache_settings_t *settings);
 
void dt_mipmap_cache_init(const dt_mipmap_cache_settings_t *settings, const gboolean verbose);
void dt_mipmap_cache_cleanup(void);
void dt_mipmap_cache_print(void);
 
// Interim accessor (Strategy B, doc/globals-migration.md): implemented by the orchestrator; long-term the handle should be carried on the job/view context (Strategy C).
 
// One cached mipmap buffer, for the GUI memory view.
typedef struct dt_mipmap_cache_stats_entry_t
{
  int32_t imgid;
  int mip;       // dt_mipmap_size_t
  size_t size;   // bytes
} dt_mipmap_cache_stats_entry_t;
 
// Current/max bytes used across all mipmap sub-caches.
void dt_mipmap_cache_get_usage(size_t *current, size_t *max);
 
// Snapshot of all cached buffers (newly-allocated GArray of
// dt_mipmap_cache_stats_entry_t; free with g_array_free()).
GArray *dt_mipmap_cache_get_entries_stats(void);
 
// get a buffer and lock according to mode ('r' or 'w').
// see dt_mipmap_get_flags_t for explanation of the exact
// behaviour. pass 0 as flags for the default (best effort)
#define dt_mipmap_cache_get(B,C,D,E,F) dt_mipmap_cache_get_with_caller(B,C,D,E,F,__FILE__,__LINE__)
void dt_mipmap_cache_get_with_caller(
    dt_mipmap_buffer_t *buf,
    const int32_t imgid,
    const dt_mipmap_size_t mip,
    const dt_mipmap_get_flags_t flags,
    const char mode,
    const char *file,
    int line);
 
#define dt_mipmap_cache_get_with_shutdown(B,C,D,E,F,G) \
  dt_mipmap_cache_get_with_caller_and_shutdown(B,C,D,E,F,G,__FILE__,__LINE__)
void dt_mipmap_cache_get_with_caller_and_shutdown(
    dt_mipmap_buffer_t *buf,
    const int32_t imgid,
    const dt_mipmap_size_t mip,
    const dt_mipmap_get_flags_t flags,
    const char mode,
    dt_atomic_int *shutdown,
    const char *file,
    int line);
 
// convenience function with fewer params
#define dt_mipmap_cache_write_get(B,C,D) dt_mipmap_cache_write_get_with_caller(B,C,D,__FILE__,__LINE__)
void dt_mipmap_cache_write_get_with_caller(
    dt_mipmap_buffer_t *buf,
    const int32_t imgid,
    const int mip,
    const char *file,
    int line);
 
// drop a lock
#define dt_mipmap_cache_release(B) dt_mipmap_cache_release_with_caller(B, __FILE__, __LINE__)
void dt_mipmap_cache_release_with_caller(dt_mipmap_buffer_t *buf, const char *file,
                                         int line);
 
// remove thumbnails, so they will be regenerated:
void dt_mipmap_cache_remove(const int32_t imgid, const gboolean flush_disk);
void dt_mipmap_cache_remove_at_size(const int32_t imgid, const dt_mipmap_size_t mip, const gboolean flush_disk);
 
/* Every buffer this image owns, the decoded raw input (DT_MIPMAP_F, DT_MIPMAP_FULL) included.
 *
 * The two are deliberately outside dt_mipmap_cache_remove(), which exists for a development
 * change: the decoded raw does not depend on the history, and dropping it there would re-read
 * and re-demosaic the file on every commit. They are equally deliberately outside
 * dt_mipmap_cache_remove_at_size(), which refuses them outright, so before this there was no
 * way to drop them for one image and nothing but memory pressure ever did.
 *
 * An image leaving the library is the case that needs it. Its input buffer outlives the row,
 * and if the image comes back -- "remove from library" is undoable -- the pipeline is handed
 * that stale entry, basebuffer slices a zero-sized buffer out of it, and the thumbnail is a
 * husk no later render replaces. Only a developed image shows it: an unaltered one is drawn
 * from the embedded JPEG and never asks for the input at all. */
void dt_mipmap_cache_remove_all_sizes(const int32_t imgid, const gboolean flush_disk);
 
// evict thumbnails from cache. They will be written to disc if not existing
void dt_mimap_cache_evict(const int32_t imgid);
 
// return the closest mipmap size
// for the given window you wish to draw.
// a dt_mipmap_size_t has always a fixed resolution associated with it,
// depending on the user parameter for the maximum thumbnail dimensions.
// actual resolution depends on the image and is only known after
// the thumbnail is loaded.
dt_mipmap_size_t dt_mipmap_cache_get_matching_size( const int32_t width, const int32_t height, const uint32_t imgid);
 
// return the closest mipmap size fitting within the width × height boundary box.
// Use that to flush a darkroom pipeline output into a cache line
dt_mipmap_size_t dt_mipmap_cache_get_fitting_size(const int32_t width,
                                                   const int32_t height, const uint32_t imgid);
 
// Manually swap the image buffer of a mipmap cacheline from an existing uint8_t image
void dt_mipmap_cache_swap_at_size(const int32_t imgid, 
                                  const dt_mipmap_size_t mip, const uint8_t *const buffer, 
                                  const int32_t width, const int32_t height, dt_colorspaces_color_profile_type_t profile);
 
// copy over thumbnails. used by file operation that copies raw files, to speed up thumbnail generation.
// only copies over the jpg backend on disk, doesn't directly affect the in-memory cache.
void dt_mipmap_cache_copy_thumbnails(const uint32_t dst_imgid, const uint32_t src_imgid);
 
// get the full path of a cached thumbnail
void dt_mipmap_get_cache_filename(char path[DT_PATH_MAX], dt_mipmap_size_t mip, const int32_t imgid);
 
// get just the dir
void dt_mipmap_get_cache_dir(char path[DT_PATH_MAX], dt_mipmap_size_t mip);
 
 
#ifdef __cplusplus
}
#endif
 
#endif // DT_CACHES_MIPMAP_CACHE_H
 
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