openimageio_support.hh

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/* SPDX-FileCopyrightText: 2023 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#pragma once
 
/* Include our own math header first to avoid warnings about M_PI
 * redefinition between OpenImageIO and Windows headers. */
#include "BLI_math_base.h"  // IWYU pragma: keep
#include "BLI_sys_types.h"
 
#include <OpenImageIO/filesystem.h>
#include <OpenImageIO/imageio.h>
 
#include "IMB_imbuf.hh"
#include "IMB_imbuf_types.hh"
 
struct ImFileColorSpace;
 
namespace blender::imbuf {

struct ReadContext {
  const uchar *mem_start;
  const size_t mem_size;
  const char *file_format;
  const eImbFileType file_type;
  const int flags;

  bool use_all_planes = false;

  bool use_metadata_colorspace = false;
};

struct WriteContext {
  const char *file_format;
  ImBuf *ibuf;
  int flags;
 
  uchar *mem_start;
  OIIO::stride_t mem_xstride;
  OIIO::stride_t mem_ystride;
  OIIO::ImageSpec mem_spec;
};

bool imb_oiio_check(const uchar *mem, size_t mem_size, const char *file_format);

ImBuf *imb_oiio_read(const ReadContext &ctx,
                     const OIIO::ImageSpec &config,
                     ImFileColorSpace &r_colorspace,
                     OIIO::ImageSpec &r_newspec);

bool imb_oiio_write(const WriteContext &ctx,
                    const char *filepath,
                    const OIIO::ImageSpec &file_spec);

WriteContext imb_create_write_context(const char *file_format,
                                      ImBuf *ibuf,
                                      int flags,
                                      bool prefer_float = true);

OIIO::ImageSpec imb_create_write_spec(const WriteContext &ctx,
                                      int file_channels,
                                      OIIO::TypeDesc data_format);
 
}  // namespace blender::imbuf