webp.c

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/*
    This file is part of darktable,
    Copyright (C) 2013 Dimitrios Psychogios.
    Copyright (C) 2013-2014 Jérémy Rosen.
    Copyright (C) 2013 Pascal de Bruijn.
    Copyright (C) 2013-2017, 2019-2020 Tobias Ellinghaus.
    Copyright (C) 2014, 2018, 2020-2021 Pascal Obry.
    Copyright (C) 2014, 2016 Roman Lebedev.
    Copyright (C) 2018 Edouard Gomez.
    Copyright (C) 2019, 2022, 2025 Aurélien PIERRE.
    Copyright (C) 2019 Sam Smith.
    Copyright (C) 2020, 2022 Diederik Ter Rahe.
    Copyright (C) 2020 Heiko Bauke.
    Copyright (C) 2021 Hubert Kowalski.
    Copyright (C) 2022 Martin Bařinka.
    Copyright (C) 2022 Miloš Komarčević.
    Copyright (C) 2023 Alynx Zhou.
    
    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/>.
*/
 
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "bauhaus/bauhaus.h"
#include "common/darktable.h"
#include "common/exif.h"
#include "common/imageio.h"
#include "common/imageio_module.h"
#include "control/conf.h"
#include "imageio/format/imageio_format_api.h"
#include "gui/gtk.h"
 
#include <stdio.h>
#include <stdlib.h>
 
#include <webp/encode.h>
#include <webp/mux.h>
 
DT_MODULE(2)
 
typedef enum
{
  webp_lossy = 0,
  webp_lossless = 1
} comp_type_t;
 
 
typedef enum
{
  hint_default,
  hint_picture,
  hint_photo,
  hint_graphic
} hint_t;
 
 
typedef struct dt_imageio_webp_t
{
  dt_imageio_module_data_t global;
  int comp_type;
  int quality;
  int hint;
} dt_imageio_webp_t;
 
typedef struct dt_imageio_webp_gui_data_t
{
  GtkWidget *compression;
  GtkWidget *quality;
  GtkWidget *hint;
} dt_imageio_webp_gui_data_t;
 
#define _stringify(a) #a
#define stringify(a) _stringify(a)
 
static const char *const EncoderError[] = {
  "ok",
  "out_of_memory: out of memory allocating objects",
  "bitstream_out_of_memory: out of memory re-allocating byte buffer",
  "null_parameter: null parameter passed to function",
  "invalid_configuration: configuration is invalid",
  "bad_dimension: bad picture dimension. maximum width and height "
  "allowed is " stringify(WEBP_MAX_DIMENSION) " pixels.",
  "partition0_overflow: partition #0 is too big to fit 512k.\n"
  "to reduce the size of this partition, try using less segments "
  "with the -segments option, and eventually reduce the number of "
  "header bits using -partition_limit. more details are available "
  "in the manual (`man cwebp`)",
  "partition_overflow: partition is too big to fit 16M",
  "bad_write: picture writer returned an i/o error",
  "file_too_big: file would be too big to fit in 4G",
  "user_abort: encoding abort requested by user"
};
 
const char *get_error_str(int err)
{
  if (err < 0 || err >= sizeof(EncoderError)/sizeof(EncoderError[0]))
  {
    return "Unknown error. Consider open an issue to ansel to update the webp error list.";
  }
  return EncoderError[err];
}
 
void init(dt_imageio_module_format_t *self)
{
}
 
void cleanup(dt_imageio_module_format_t *self)
{
}
 
int write_image(dt_imageio_module_data_t *webp, const char *filename, const void *in_tmp,
                dt_colorspaces_color_profile_type_t over_type, const char *over_filename,
                void *exif, int exif_len, int32_t imgid, int num, int total, struct dt_dev_pixelpipe_t *pipe,
                const gboolean export_masks)
{
  int res = 1;
  FILE *out = NULL;
  uint8_t *buf = NULL;
  WebPPicture pic;
  WebPMemoryWriter writer;
  WebPMemoryWriterInit(&writer);
  WebPData icc_profile;
  WebPDataInit(&icc_profile);
  WebPData bitstream;
  WebPDataInit(&bitstream);
  WebPData assembled_data;
  WebPDataInit(&assembled_data);
  WebPMux *mux = WebPMuxNew();
  WebPMuxError err;
 
  dt_imageio_webp_t *webp_data = (dt_imageio_webp_t *)webp;
 
  // Create, configure and validate a WebPConfig instance
  WebPConfig config;
  if(!WebPConfigPreset(&config, webp_data->hint, (float)webp_data->quality)) goto out;
 
  // TODO(jinxos): expose more config options in the UI
  config.lossless = webp_data->comp_type;
  config.image_hint = webp_data->hint;
  config.method = 6;
 
  // these are to allow for large image export.
  // TODO(jinxos): these values should be adjusted as needed and ideally determined at runtime.
  config.segments = 4;
  config.partition_limit = 70;
  if(!WebPValidateConfig(&config))
  {
    fprintf(stderr, "[webp export] error validating encoder configuration\n");
    goto out;
  }
 
  // embed ICC profile
  cmsHPROFILE out_profile = dt_colorspaces_get_output_profile(imgid, &over_type, over_filename)->profile;
  uint32_t len = 0;
  cmsSaveProfileToMem(out_profile, NULL, &len);
  if(len > 0)
  {
    buf = (uint8_t *)g_malloc(len);
    if(buf)
    {
      cmsSaveProfileToMem(out_profile, buf, &len);
      icc_profile.bytes = buf;
      icc_profile.size = len;
      err = WebPMuxSetChunk(mux, "ICCP", &icc_profile, 0);
      if(err != WEBP_MUX_OK)
      {
        fprintf(stderr, "[webp export] error adding ICC profile to WebP stream\n");
        goto out;
      }
    }
    else
    {
      fprintf(stderr, "[webp export] error allocating ICC profile buffer\n");
      goto out;
    }
  }
 
  // encode image data to memory and add to mux
  if(!WebPPictureInit(&pic)) goto out;
  pic.width = webp_data->global.width;
  pic.height = webp_data->global.height;
  pic.use_argb = !!(config.lossless);
  pic.writer = WebPMemoryWrite;
  pic.custom_ptr = &writer;
 
  WebPPictureImportRGBX(&pic, (const uint8_t *)in_tmp, webp_data->global.width * 4);
  if(!config.lossless)
  {
    // webp is more efficient at coding YUV images, as we go lossy
    // let the encoder where best to spend its bits instead of forcing it
    // to spend bits equally on RGB data that doesn't weight the same when
    // considering the human visual system.
    // use the slower, but better and sharper YUV conversion.
    WebPPictureSharpARGBToYUVA(&pic);
  }
 
  if(!WebPEncode(&config, &pic))
  {
    fprintf(stderr, "[webp export] error during encoding (error: %d - %s)\n",
            pic.error_code, get_error_str(pic.error_code));
    goto out;
  }
 
  bitstream.bytes = writer.mem;
  bitstream.size = writer.size;
  err = WebPMuxSetImage(mux, &bitstream, 0);
  if(err != WEBP_MUX_OK)
  {
    fprintf(stderr, "[webp export] error adding image to WebP stream\n");
    goto out;
  }
 
  // finally write out assembled data to file
  err = WebPMuxAssemble(mux, &assembled_data);
  if(err != WEBP_MUX_OK)
  {
    fprintf(stderr, "[webp export] error assembling the WebP file\n");
    goto out;
  }
 
  out = g_fopen(filename, "w+b");
  if(IS_NULL_PTR(out))
  {
    fprintf(stderr, "[webp export] error creating file %s\n", filename);
    goto out;
  }
  if(fwrite(assembled_data.bytes, assembled_data.size, 1, out) != 1)
  {
    fprintf(stderr, "[webp export] error writing %" G_GSIZE_FORMAT " bytes to file %s\n", assembled_data.size, filename);
    goto out;
  }
 
  res = 0;
 
out:
  WebPPictureFree(&pic);
  WebPMemoryWriterClear(&writer); // no need to WebPDataClear(&bitstream) as well
  dt_free(buf); // instead of WebPDataClear(&icc_profile)
  WebPDataClear(&assembled_data);
  WebPMuxDelete(mux);
  fclose(out);
  if(!res && exif) dt_exif_write_blob(exif, exif_len, filename, 1);
  return res;
}
 
size_t params_size(dt_imageio_module_format_t *self)
{
  return sizeof(dt_imageio_webp_t);
}
 
void *legacy_params(dt_imageio_module_format_t *self, const void *const old_params,
                    const size_t old_params_size, const int old_version, const int new_version,
                    size_t *new_size)
{
  if(old_version == 1 && new_version == 2)
  {
    typedef struct dt_imageio_webp_v1_t
    {
      int max_width, max_height;
      int width, height;
      char style[128];
      int comp_type;
      int quality;
      int hint;
    } dt_imageio_webp_v1_t;
 
    dt_imageio_webp_v1_t *o = (dt_imageio_webp_v1_t *)old_params;
    dt_imageio_webp_t *n = (dt_imageio_webp_t *)malloc(sizeof(dt_imageio_webp_t));
 
    n->global.max_width = o->max_width;
    n->global.max_height = o->max_height;
    n->global.width = o->width;
    n->global.height = o->height;
    g_strlcpy(n->global.style, o->style, sizeof(o->style));
    n->comp_type = o->comp_type;
    n->quality = o->quality;
    n->hint = o->hint;
    *new_size = self->params_size(self);
    return n;
  }
  return NULL;
}
 
void *get_params(dt_imageio_module_format_t *self)
{
  dt_imageio_webp_t *d = (dt_imageio_webp_t *)calloc(1, sizeof(dt_imageio_webp_t));
  d->comp_type = dt_conf_get_int("plugins/imageio/format/webp/comp_type");
  if(d->comp_type == webp_lossy)
    d->quality = dt_conf_get_int("plugins/imageio/format/webp/quality");
  else
    d->quality = 100;
  d->hint = dt_conf_get_int("plugins/imageio/format/webp/hint");
  return d;
}
 
int set_params(dt_imageio_module_format_t *self, const void *params, const int size)
{
  if(size != self->params_size(self)) return 1;
  const dt_imageio_webp_t *d = (dt_imageio_webp_t *)params;
  dt_imageio_webp_gui_data_t *g = (dt_imageio_webp_gui_data_t *)self->gui_data;
  dt_bauhaus_combobox_set(g->compression, d->comp_type);
  dt_bauhaus_slider_set(g->quality, d->quality);
  dt_bauhaus_combobox_set(g->hint, d->hint);
  return 0;
}
 
void free_params(dt_imageio_module_format_t *self, dt_imageio_module_data_t *params)
{
  dt_free(params);
}
 
int bpp(dt_imageio_module_data_t *p)
{
  return 8;
}
 
int levels(dt_imageio_module_data_t *p)
{
  return IMAGEIO_RGB | IMAGEIO_INT8;
}
 
const char *mime(dt_imageio_module_data_t *data)
{
  // TODO: revisit this when IANA makes it official.
  return "image/webp";
}
 
const char *extension(dt_imageio_module_data_t *data)
{
  return "webp";
}
 
const char *name()
{
  return _("WebP (8-bit)");
}
 
static void compression_changed(GtkWidget *widget, gpointer user_data)
{
  const int comp_type = dt_bauhaus_combobox_get(widget);
  dt_conf_set_int("plugins/imageio/format/webp/comp_type", comp_type);
 
  if (comp_type == webp_lossless)
    gtk_widget_set_sensitive(GTK_WIDGET(user_data), FALSE);
  else
    gtk_widget_set_sensitive(GTK_WIDGET(user_data), TRUE);
}
 
static void quality_changed(GtkWidget *slider, gpointer user_data)
{
  const int quality = (int)dt_bauhaus_slider_get(slider);
  dt_conf_set_int("plugins/imageio/format/webp/quality", quality);
}
 
static void hint_combobox_changed(GtkWidget *widget, gpointer user_data)
{
  const int hint = dt_bauhaus_combobox_get(widget);
  dt_conf_set_int("plugins/imageio/format/webp/hint", hint);
}
 
void gui_init(dt_imageio_module_format_t *self)
{
  dt_imageio_webp_gui_data_t *gui = (dt_imageio_webp_gui_data_t *)malloc(sizeof(dt_imageio_webp_gui_data_t));
  self->gui_data = (void *)gui;
  const int comp_type = dt_conf_get_int("plugins/imageio/format/webp/comp_type");
  const int quality = dt_conf_get_int("plugins/imageio/format/webp/quality");
  const int hint = dt_conf_get_int("plugins/imageio/format/webp/hint");
 
  self->widget = gtk_box_new(GTK_ORIENTATION_VERTICAL, DT_GUI_BOX_SPACING);
 
  gui->compression = dt_bauhaus_combobox_new(darktable.bauhaus, DT_GUI_MODULE(NULL));
  dt_bauhaus_widget_set_label(gui->compression, N_("compression type"));
  dt_bauhaus_combobox_add(gui->compression, _("lossy"));
  dt_bauhaus_combobox_add(gui->compression, _("lossless"));
  dt_bauhaus_combobox_set(gui->compression, comp_type);
  gtk_box_pack_start(GTK_BOX(self->widget), gui->compression, TRUE, TRUE, 0);
 
  gui->quality = dt_bauhaus_slider_new_with_range(darktable.bauhaus, DT_GUI_MODULE(NULL),
                                                  dt_confgen_get_int("plugins/imageio/format/webp/quality", DT_MIN),
                                                  dt_confgen_get_int("plugins/imageio/format/webp/quality", DT_MAX),
                                                  1,
                                                  dt_confgen_get_int("plugins/imageio/format/webp/quality", DT_DEFAULT),
                                                  0);
  dt_bauhaus_widget_set_label(gui->quality, N_("quality"));
  dt_bauhaus_slider_set_default(gui->quality, dt_confgen_get_int("plugins/imageio/format/webp/quality", DT_DEFAULT));
  dt_bauhaus_slider_set_format(gui->quality, "%");
  gtk_widget_set_tooltip_text(gui->quality, _("applies only to lossy setting"));
  if(quality > 0 && quality <= 100) dt_bauhaus_slider_set(gui->quality, quality);
  gtk_box_pack_start(GTK_BOX(self->widget), gui->quality, TRUE, TRUE, 0);
  g_signal_connect(G_OBJECT(gui->quality), "value-changed", G_CALLBACK(quality_changed), (gpointer)0);
 
  g_signal_connect(G_OBJECT(gui->compression), "value-changed", G_CALLBACK(compression_changed), (gpointer)gui->quality);
 
  if (comp_type == webp_lossless)
    gtk_widget_set_sensitive(gui->quality, FALSE);
 
  gui->hint = dt_bauhaus_combobox_new(darktable.bauhaus, DT_GUI_MODULE(NULL));
  dt_bauhaus_widget_set_label(gui->hint, N_("image hint"));
  gtk_widget_set_tooltip_text(gui->hint,
               _("image characteristics hint for the underlying encoder.\n"
               "picture : digital picture, like portrait, inner shot\n"
               "photo   : outdoor photograph, with natural lighting\n"
               "graphic : discrete tone image (graph, map-tile etc)"));
  dt_bauhaus_combobox_add(gui->hint, _("default"));
  dt_bauhaus_combobox_add(gui->hint, _("picture"));
  dt_bauhaus_combobox_add(gui->hint, _("photo"));
  dt_bauhaus_combobox_add(gui->hint, _("graphic"));
  dt_bauhaus_combobox_set(gui->hint, hint);
  gtk_box_pack_start(GTK_BOX(self->widget), gui->hint, TRUE, TRUE, 0);
  g_signal_connect(G_OBJECT(gui->hint), "value-changed", G_CALLBACK(hint_combobox_changed), NULL);
}
 
void gui_cleanup(dt_imageio_module_format_t *self)
{
  dt_free(self->gui_data);
}
 
void gui_reset(dt_imageio_module_format_t *self)
{
  dt_imageio_webp_gui_data_t *gui = (dt_imageio_webp_gui_data_t *)self->gui_data;
  const int comp_type = dt_confgen_get_int("plugins/imageio/format/webp/comp_type", DT_DEFAULT);
  const int quality = dt_confgen_get_int("plugins/imageio/format/webp/quality", DT_DEFAULT);
  const int hint = dt_confgen_get_int("plugins/imageio/format/webp/hint", DT_DEFAULT);
  dt_bauhaus_combobox_set(gui->compression, comp_type);
  dt_bauhaus_slider_set(gui->quality, quality);
  dt_bauhaus_combobox_set(gui->hint, hint);
}
 
int flags(dt_imageio_module_data_t *data)
{
  // TODO(jinxos): support embedded ICC
  return FORMAT_FLAGS_SUPPORT_XMP;
}
 
// clang-format off
// modelines: These editor modelines have been set for all relevant files by tools/update_modelines.py
// vim: shiftwidth=2 expandtab tabstop=2 cindent
// kate: tab-indents: off; indent-width 2; replace-tabs on; indent-mode cstyle; remove-trailing-spaces modified;
// clang-format on