imageio_webp.c

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/*
    This file is part of the Ansel project.
    Copyright (C) 2023 Alynx Zhou.
    
    Ansel 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.
    
    Ansel 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 Ansel.  If not, see <http://www.gnu.org/licenses/>.
*/
 
#include "system/macros.h"
#include "system/mem_alloc.h"
#include "common/logging.h"
#include "system/openmp.h"
#include <glib/gstdio.h>
#include <inttypes.h>
 
#include <webp/decode.h>
#include <webp/mux.h>
 
#include "common/image.h"
#include "develop/imageop.h"         // for IOP_CS_RGB
 
dt_imageio_retval_t dt_imageio_open_webp(dt_image_t *img, const char *filename, dt_mipmap_buffer_t *mbuf)
{
  int w, h;
  WebPMux *mux;
  WebPData wp_data;
  WebPData icc_profile;
 
  FILE *f = g_fopen(filename, "rb");
  if(IS_NULL_PTR(f))
  {
    dt_print(DT_DEBUG_IMAGEIO, "[webp_open] cannot open file for read: %s\n", filename);
    return DT_IMAGEIO_FILE_CORRUPTED;
  }
 
  fseek(f, 0, SEEK_END);
  size_t filesize = ftell(f);
  fseek(f, 0, SEEK_SET);
 
  void *read_buffer = g_malloc(filesize);
 
  if(fread(read_buffer, 1, filesize, f) != filesize)
  {
    fclose(f);
    dt_free(read_buffer);
    dt_print(DT_DEBUG_IMAGEIO, "[webp_open] failed to read %" G_GSIZE_FORMAT " bytes from %s\n", filesize, filename);
    return DT_IMAGEIO_FILE_CORRUPTED;
  }
  fclose(f);
 
  // WebPGetInfo should tell us the image dimensions needed for darktable image buffer allocation
  if(!WebPGetInfo(read_buffer, filesize, &w, &h))
  {
    // If we couldn't get the webp metadata, then the file we're trying to read is most likely in
    // a different format (darktable just trying different loaders until it finds the right one).
    // We just have to return without complaining.
    dt_free(read_buffer);
    return DT_IMAGEIO_FILE_CORRUPTED;
  }
  img->width = w;
  img->height = h;
  img->dsc.channels = 4;
  img->dsc.datatype = TYPE_FLOAT;
  img->dsc.bpp = 4 * sizeof(float);
  img->dsc.cst = IOP_CS_RGB;
  img->dsc.filters = 0u;
  img->flags &= ~DT_IMAGE_RAW;
  img->flags &= ~DT_IMAGE_S_RAW;
  img->flags &= ~DT_IMAGE_HDR;
  img->flags |= DT_IMAGE_LDR;
  img->loader = LOADER_WEBP;
 
  if(IS_NULL_PTR(mbuf))
  {
    dt_free(read_buffer);
    return DT_IMAGEIO_OK;
  }
 
  float *mipbuf = (float *)dt_mipmap_cache_alloc(mbuf, img);
  if(IS_NULL_PTR(mipbuf))
  {
    dt_free(read_buffer);
    dt_print(DT_DEBUG_IMAGEIO, "[webp_open] could not alloc full buffer for image: %s\n", img->filename);
    return DT_IMAGEIO_CACHE_FULL;
  }
 
  uint8_t *int_RGBA_buf = WebPDecodeRGBA(read_buffer, filesize, &w, &h);
  if(IS_NULL_PTR(int_RGBA_buf))
  {
    dt_free(read_buffer);
    dt_print(DT_DEBUG_IMAGEIO,"[webp_open] failed to decode file: %s\n", filename);
    return DT_IMAGEIO_FILE_CORRUPTED;
  }
 
  uint8_t intval;
  float floatval;
  __OMP_PARALLEL_FOR__(private(intval, floatval))
  for(int i=0; i < w*h*4; i++)
  {
    intval = *(int_RGBA_buf+i);
    floatval = intval / 255.f;
    *(mipbuf+i) = floatval;
  }
 
  WebPFree(int_RGBA_buf);
 
  wp_data.bytes = (uint8_t *)read_buffer;
  wp_data.size = filesize;
  mux = WebPMuxCreate(&wp_data, 0); // 0 = data will NOT be copied to the mux object
 
  if(mux)
  {
    WebPMuxGetChunk(mux, "ICCP", &icc_profile);
    if(icc_profile.size)
    {
      img->profile_size = icc_profile.size;
      img->profile = (uint8_t *)g_malloc0(icc_profile.size);
      memcpy(img->profile, icc_profile.bytes, icc_profile.size);
    }
    WebPMuxDelete(mux);
  }
 
  dt_free(read_buffer);
  return DT_IMAGEIO_OK;
}
 
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