codestream_header.h

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/* Copyright (c) the JPEG XL Project Authors. All rights reserved.
 *
 * Use of this source code is governed by a BSD-style
 * license that can be found in the LICENSE file.
 */

 
#ifndef JXL_CODESTREAM_HEADER_H_
#define JXL_CODESTREAM_HEADER_H_
 
#include <jxl/types.h>
#include <stddef.h>
#include <stdint.h>
 
#ifdef __cplusplus
extern "C" {
#endif

typedef enum {
  JXL_ORIENT_IDENTITY = 1,
  JXL_ORIENT_FLIP_HORIZONTAL = 2,
  JXL_ORIENT_ROTATE_180 = 3,
  JXL_ORIENT_FLIP_VERTICAL = 4,
  JXL_ORIENT_TRANSPOSE = 5,
  JXL_ORIENT_ROTATE_90_CW = 6,
  JXL_ORIENT_ANTI_TRANSPOSE = 7,
  JXL_ORIENT_ROTATE_90_CCW = 8,
} JxlOrientation;

typedef enum {
  JXL_CHANNEL_ALPHA,
  JXL_CHANNEL_DEPTH,
  JXL_CHANNEL_SPOT_COLOR,
  JXL_CHANNEL_SELECTION_MASK,
  JXL_CHANNEL_BLACK,
  JXL_CHANNEL_CFA,
  JXL_CHANNEL_THERMAL,
  JXL_CHANNEL_RESERVED0,
  JXL_CHANNEL_RESERVED1,
  JXL_CHANNEL_RESERVED2,
  JXL_CHANNEL_RESERVED3,
  JXL_CHANNEL_RESERVED4,
  JXL_CHANNEL_RESERVED5,
  JXL_CHANNEL_RESERVED6,
  JXL_CHANNEL_RESERVED7,
  JXL_CHANNEL_UNKNOWN,
  JXL_CHANNEL_OPTIONAL
} JxlExtraChannelType;

typedef struct {
  uint32_t xsize;

  uint32_t ysize;
} JxlPreviewHeader;

typedef struct {
  uint32_t tps_numerator;

  uint32_t tps_denominator;

  uint32_t num_loops;

  JXL_BOOL have_timecodes;
} JxlAnimationHeader;

typedef struct {
  /* TODO(lode): need additional fields for (transcoded) JPEG? For reusable
   * fields orientation must be read from Exif APP1. For has_icc_profile: must
   * look up where ICC profile is guaranteed to be in a JPEG file to be able to
   * indicate this. */
 
  /* TODO(lode): make struct packed, and/or make this opaque struct with getter
   * functions (still separate struct from opaque decoder) */

  JXL_BOOL have_container;

  uint32_t xsize;

  uint32_t ysize;

  uint32_t bits_per_sample;

  uint32_t exponent_bits_per_sample;

  float intensity_target;

  float min_nits;

  JXL_BOOL relative_to_max_display;

  float linear_below;

  JXL_BOOL uses_original_profile;

  JXL_BOOL have_preview;

  JXL_BOOL have_animation;

  JxlOrientation orientation;

  uint32_t num_color_channels;

  uint32_t num_extra_channels;

  uint32_t alpha_bits;

  uint32_t alpha_exponent_bits;

  JXL_BOOL alpha_premultiplied;

  JxlPreviewHeader preview;

  JxlAnimationHeader animation;

  uint32_t intrinsic_xsize;

  uint32_t intrinsic_ysize;

  uint8_t padding[100];
} JxlBasicInfo;

typedef struct {
  JxlExtraChannelType type;

  uint32_t bits_per_sample;

  uint32_t exponent_bits_per_sample;

  uint32_t dim_shift;

  uint32_t name_length;

  JXL_BOOL alpha_premultiplied;

  float spot_color[4];

  uint32_t cfa_channel;
} JxlExtraChannelInfo;
 
/* TODO(lode): add API to get the codestream header extensions. */
typedef struct {
  uint64_t extensions;
} JxlHeaderExtensions;

typedef enum {
  JXL_BLEND_REPLACE = 0,
  JXL_BLEND_ADD = 1,
  JXL_BLEND_BLEND = 2,
  JXL_BLEND_MULADD = 3,
  JXL_BLEND_MUL = 4,
} JxlBlendMode;

typedef struct {
  JxlBlendMode blendmode;
  uint32_t source;
  uint32_t alpha;
  JXL_BOOL clamp;
} JxlBlendInfo;

typedef struct {
  JXL_BOOL have_crop;

  int32_t crop_x0;

  int32_t crop_y0;

  uint32_t xsize;

  uint32_t ysize;

  JxlBlendInfo blend_info;

  uint32_t save_as_reference;
} JxlLayerInfo;

typedef struct {
  uint32_t duration;

  uint32_t timecode;

  uint32_t name_length;

  JXL_BOOL is_last;

  JxlLayerInfo layer_info;
} JxlFrameHeader;
 
#ifdef __cplusplus
}
#endif
 
#endif /* JXL_CODESTREAM_HEADER_H_ */