thumbnail.h

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/*
    This file is part of darktable,
    Copyright (C) 2010-2011 Henrik Andersson.
    Copyright (C) 2010, 2012 johannes hanika.
    Copyright (C) 2012 Richard Wonka.
    Copyright (C) 2013, 2021 Pascal Obry.
    Copyright (C) 2014, 2016, 2020 Tobias Ellinghaus.
    Copyright (C) 2018 Rick Yorgason.
    Copyright (C) 2019 Philippe Weyland.
    Copyright (C) 2020-2021 Aldric Renaudin.
    Copyright (C) 2020 Hanno Schwalm.
    Copyright (C) 2020 Tianhao Chai.
    Copyright (C) 2021 Fabio Heer.
    Copyright (C) 2021 luzpaz.
    Copyright (C) 2022-2023, 2025-2026 Aurélien PIERRE.
    Copyright (C) 2022 Martin Bařinka.
    Copyright (C) 2022 Nicolas Auffray.
    
    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_GUI_DTGTK_THUMBNAIL_H
#define DT_GUI_DTGTK_THUMBNAIL_H
 
#include "system/atomic.h"
#include "common/debug.h"
#include "common/logging.h"
#include "gui/dtgtk/thumbtable_info.h"
 
#include <glib.h>
#include <gtk/gtk.h>
 
#define MAX_STARS 5
 
struct dt_thumbtable_t;
 
typedef enum dt_thumbnail_border_t
{
  DT_THUMBNAIL_BORDER_NONE = 0,
  DT_THUMBNAIL_BORDER_LEFT = 1 << 0,
  DT_THUMBNAIL_BORDER_TOP = 1 << 1,
  DT_THUMBNAIL_BORDER_RIGHT = 1 << 2,
  DT_THUMBNAIL_BORDER_BOTTOM = 1 << 3,
} dt_thumbnail_border_t;
 
typedef enum dt_thumbnail_overlay_t
{
  DT_THUMBNAIL_OVERLAYS_NONE,
  DT_THUMBNAIL_OVERLAYS_HOVER_NORMAL,
  DT_THUMBNAIL_OVERLAYS_ALWAYS_NORMAL,
  DT_THUMBNAIL_OVERLAYS_LAST
} dt_thumbnail_overlay_t;
 
 
typedef struct
{
  int32_t rowid;
  int width, height;         // current thumb size (with the background and the border)
  int x, y;                  // current position at screen
  int img_width, img_height; // current image size (can be greater than the image box in case of zoom)
 
  gboolean mouse_over;
  gboolean selected;
 
  dt_image_t info;
 
  // all widget components
  GtkWidget *widget;               // GtkEventbox -- parent of all others
  GtkWidget *w_main;               // GtkOverlay --
  GtkWidget *w_background;         // GtkBox, because a GtkOverlay can't get styling apparently
  GtkWidget *w_ext;                // GtkLabel -- thumbnail extension
 
  GtkWidget *w_image;        // GtkDrawingArea -- thumbnail image
  cairo_surface_t *img_surf; // cached surface at exact dimensions to speed up redraw
 
  GtkWidget *w_cursor;    // GtkDrawingArea -- triangle to show current image(s) in filmstrip
  GtkWidget *w_bottom_eb; // GtkEventBox -- background of the bottom infos area (contains w_bottom)
  GtkWidget *w_reject;    // GtkDarktableThumbnailBtn -- Reject icon
  GtkWidget *w_stars[MAX_STARS];  // GtkDarktableThumbnailBtn -- Stars icons
  GtkWidget *w_color;     // GtkDarktableThumbnailBtn -- Colorlabels "flower" icon
 
  GtkWidget *w_top_eb;
  GtkWidget *w_local_copy; // GtkDarktableThumbnailBtn -- localcopy triangle
  GtkWidget *w_altered;    // GtkDarktableThumbnailBtn -- Altered icon
  GtkWidget *w_group;      // GtkDarktableThumbnailBtn -- Grouping icon
  GtkWidget *w_audio;      // GtkDarktableThumbnailBtn -- Audio sidecar icon
 
  GtkWidget *w_alternative; // alternative overlay
 
  dt_thumbnail_border_t group_borders; // which group borders should be drawn
 
  gboolean disable_mouseover;             // do we allow to change mouseoverid by mouse move
  gboolean disable_actions;               // do we allow to change rating/etc...
 
  dt_thumbnail_overlay_t over;  // type of overlays
 
  // difference between the global zoom values and the value to apply to this specific thumbnail
  double zoomx;   // zoom panning of the image
  double zoomy;   //
  double drag_x_start;
  double drag_y_start;
  gboolean dragging;
 
  struct dt_thumbtable_t *table; // convenience reference to the parent
 
  // Set FALSE when the thumbnail size changed, set TRUE when we have a Cairo image surface for that size
  gboolean image_inited;
 
  gboolean alternative_mode;
  GtkWidget *w_exposure;
  GtkWidget *w_exposure_bias;
  GtkWidget *w_camera;
  GtkWidget *w_filename;
  GtkWidget *w_datetime;
  GtkWidget *w_lens;
  GtkWidget *w_focal;
  GtkWidget *w_folder;
 
  dt_pthread_mutex_t lock;
  struct _dt_job_t *job;
  dt_atomic_int destroying;
  dt_atomic_int ref_count;
 
  // Thumbnail actual image sizes (bounding box of GUI widget)
  int img_w;
  int img_h;
 
} dt_thumbnail_t;
 
dt_thumbnail_t *dt_thumbnail_new(int rowid, dt_thumbnail_overlay_t over, struct dt_thumbtable_t *table,
                                 dt_image_t *info);
int dt_thumbnail_destroy(dt_thumbnail_t *thumb);
GtkWidget *dt_thumbnail_create_widget(dt_thumbnail_t *thumb);
void dt_thumbnail_resize(dt_thumbnail_t *thumb, int width, int height);
void dt_thumbnail_set_group_border(dt_thumbnail_t *thumb, dt_thumbnail_border_t border);
void dt_thumbnail_set_mouseover(dt_thumbnail_t *thumb, gboolean over);
void dt_thumbnail_set_overlay(dt_thumbnail_t *thumb, dt_thumbnail_overlay_t mode);
 
// set if the thumbnail should react (mouse_over) to drag and drop
// note that it's just cosmetic as dropping occurs in thumbtable in any case
void dt_thumbnail_set_drop(dt_thumbnail_t *thumb, gboolean accept_drop);
 
// Resync cached image info for this thumbnail with any arbitrary new info
void dt_thumbnail_resync_info(dt_thumbnail_t *thumb, const dt_image_t *const info);
 
// Full update of the image information and update icons accordingly, using the image cache
void dt_thumbnail_update_gui(dt_thumbnail_t *thumb);
 
// check if the image is selected and set its state and background
void dt_thumbnail_update_selection(dt_thumbnail_t *thumb, gboolean selected);
 
// force image recomputing
int dt_thumbnail_image_refresh_real(dt_thumbnail_t *thumb);
#define dt_thumbnail_image_refresh(thumb) DT_DEBUG_TRACE_WRAPPER(DT_DEBUG_LIGHTTABLE, dt_thumbnail_image_refresh_real, (thumb))
 
void dt_thumbnail_alternative_mode(dt_thumbnail_t *thumb, gboolean enable);
 
// If prefetching, Gtk won't redraw the invisible thumbnails so we need to manually call this ahead.
// Return 1 on error.
int dt_thumbnail_get_image_buffer(dt_thumbnail_t *thumb);
 
static inline dt_thumbnail_overlay_t sanitize_overlays(dt_thumbnail_overlay_t overlays)
{
  return (dt_thumbnail_overlay_t)MIN(overlays, DT_THUMBNAIL_OVERLAYS_LAST - 1);
}
 
#endif // DT_GUI_DTGTK_THUMBNAIL_H
 
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