Storage, name and type information for an attribute. More...

#include <openexr_attr.h>

Public Attributes
const char *	name

const char *	type_name

uint8_t	name_length

uint8_t	type_name_length

uint8_t	pad [2]

exr_attribute_type_t	type

union {
uint8_t uc

double d

float f

int32_t i

exr_attr_box2i_t * box2i

exr_attr_box2f_t * box2f

exr_attr_chlist_t * chlist

exr_attr_chromaticities_t * chromaticities

exr_attr_keycode_t * keycode

exr_attr_float_vector_t * floatvector

exr_attr_m33f_t * m33f

exr_attr_m33d_t * m33d

exr_attr_m44f_t * m44f

exr_attr_m44d_t * m44d

exr_attr_preview_t * preview

exr_attr_rational_t * rational

exr_attr_string_t * string

exr_attr_string_vector_t * stringvector

exr_attr_tiledesc_t * tiledesc

exr_attr_timecode_t * timecode

exr_attr_v2i_t * v2i

exr_attr_v2f_t * v2f

exr_attr_v2d_t * v2d

exr_attr_v3i_t * v3i

exr_attr_v3f_t * v3f

exr_attr_v3d_t * v3d

exr_attr_opaquedata_t * opaque

uint8_t * rawptr

};

Detailed Description

Storage, name and type information for an attribute.

Attributes (metadata) for the file cause a surprising amount of overhead. It is not uncommon for a production-grade EXR to have many attributes. As such, the attribute struct is designed in a slightly more complicated manner. It is optimized to have the storage for that attribute: the struct itself, the name, the type, and the data all allocated as one block. Further, the type and standard names may use a static string to avoid allocating space for those as necessary with the pointers pointing to static strings (not to be freed). Finally, small values are optimized for.

Definition at line 469 of file openexr_attr.h.

Member Data Documentation

union { ... }

Union of pointers of different types that can be used to type pun to an appropriate type for builtins. Do note that while this looks like a big thing, it is only the size of a single pointer. These are all pointers into some other data block storing the value you want, with the exception of the pod types which are just put in place (i.e. small value optimization).

The attribute type type should directly correlate to one of these entries.

exr_attr_box2f_t* exr_attribute_t::box2f

Definition at line 504 of file openexr_attr.h.

exr_attr_box2i_t* exr_attribute_t::box2i

Definition at line 503 of file openexr_attr.h.

exr_attr_chlist_t* exr_attribute_t::chlist

Definition at line 505 of file openexr_attr.h.

exr_attr_chromaticities_t* exr_attribute_t::chromaticities

Definition at line 506 of file openexr_attr.h.

double exr_attribute_t::d

Definition at line 499 of file openexr_attr.h.

float exr_attribute_t::f

Definition at line 500 of file openexr_attr.h.

exr_attr_float_vector_t* exr_attribute_t::floatvector

Definition at line 508 of file openexr_attr.h.

int32_t exr_attribute_t::i

Definition at line 501 of file openexr_attr.h.

exr_attr_keycode_t* exr_attribute_t::keycode

Definition at line 507 of file openexr_attr.h.

exr_attr_m33d_t* exr_attribute_t::m33d

Definition at line 510 of file openexr_attr.h.

exr_attr_m33f_t* exr_attribute_t::m33f

Definition at line 509 of file openexr_attr.h.

exr_attr_m44d_t* exr_attribute_t::m44d

Definition at line 512 of file openexr_attr.h.

exr_attr_m44f_t* exr_attribute_t::m44f

Definition at line 511 of file openexr_attr.h.

const char* exr_attribute_t::name

Name of the attribute.

Definition at line 472 of file openexr_attr.h.

uint8_t exr_attribute_t::name_length

Length of name string (short flag is 31 max, long allows 255).

Definition at line 476 of file openexr_attr.h.

exr_attr_opaquedata_t* exr_attribute_t::opaque

Definition at line 525 of file openexr_attr.h.

uint8_t exr_attribute_t::pad[2]

Definition at line 480 of file openexr_attr.h.

exr_attr_preview_t* exr_attribute_t::preview

Definition at line 513 of file openexr_attr.h.

exr_attr_rational_t* exr_attribute_t::rational

Definition at line 514 of file openexr_attr.h.

uint8_t* exr_attribute_t::rawptr

Definition at line 526 of file openexr_attr.h.

exr_attr_string_t* exr_attribute_t::string

Definition at line 515 of file openexr_attr.h.

exr_attr_string_vector_t* exr_attribute_t::stringvector

Definition at line 516 of file openexr_attr.h.

exr_attr_tiledesc_t* exr_attribute_t::tiledesc

Definition at line 517 of file openexr_attr.h.

exr_attr_timecode_t* exr_attribute_t::timecode

Definition at line 518 of file openexr_attr.h.

exr_attribute_type_t exr_attribute_t::type

Enum of the attribute type.

Definition at line 483 of file openexr_attr.h.

const char* exr_attribute_t::type_name

String type name of the attribute.

Definition at line 474 of file openexr_attr.h.

uint8_t exr_attribute_t::type_name_length

Length of type string (short flag is 31 max, long allows 255).

Definition at line 478 of file openexr_attr.h.

uint8_t exr_attribute_t::uc

Definition at line 498 of file openexr_attr.h.

exr_attr_v2d_t* exr_attribute_t::v2d

Definition at line 521 of file openexr_attr.h.

exr_attr_v2f_t* exr_attribute_t::v2f

Definition at line 520 of file openexr_attr.h.

exr_attr_v2i_t* exr_attribute_t::v2i

Definition at line 519 of file openexr_attr.h.

exr_attr_v3d_t* exr_attribute_t::v3d

Definition at line 524 of file openexr_attr.h.

exr_attr_v3f_t* exr_attribute_t::v3f

Definition at line 523 of file openexr_attr.h.

exr_attr_v3i_t* exr_attribute_t::v3i

Definition at line 522 of file openexr_attr.h.

The documentation for this struct was generated from the following file:

OpenEXR/openexr_attr.h

Public Attributes

Detailed Description

Member Data Documentation