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openexr_coding.h
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/* ** SPDX-License-Identifier: BSD-3-Clause ** Copyright Contributors to the OpenEXR Project. */ #ifndef OPENEXR_CORE_CODING_H #define OPENEXR_CORE_CODING_H #include <stdint.h> #ifdef __cplusplus extern "C" { #endif /** @file */ /** * Enum for use in a custom allocator in the encode/decode pipelines * (that is, so the implementor knows whether to allocate on which * device based on the buffer disposition). */ typedef enum exr_transcoding_pipeline_buffer_id { EXR_TRANSCODE_BUFFER_PACKED, EXR_TRANSCODE_BUFFER_UNPACKED, EXR_TRANSCODE_BUFFER_COMPRESSED, EXR_TRANSCODE_BUFFER_SCRATCH1, EXR_TRANSCODE_BUFFER_SCRATCH2, EXR_TRANSCODE_BUFFER_PACKED_SAMPLES, EXR_TRANSCODE_BUFFER_SAMPLES } exr_transcoding_pipeline_buffer_id_t; /** @brief Struct for negotiating buffers when decoding/encoding * chunks of data. * * This is generic and meant to negotiate exr data bi-directionally, * in that the same structure is used for both decoding and encoding * chunks for read and write, respectively. * * The first half of the structure will be filled by the library, and * the caller is expected to fill the second half appropriately. */ typedef struct { /************************************************** * Elements below are populated by the library when * decoding is initialized/updated and must be left * untouched when using the default decoder routines. **************************************************/ /** Channel name. * * This is provided as a convenient reference. Do not free, this * refers to the internal data structure in the context. */ const char* channel_name; /** Number of lines for this channel in this chunk. * * May be 0 or less than overall image height based on sampling * (i.e. when in 4:2:0 type sampling) */ int32_t height; /** Width in pixel count. * * May be 0 or less than overall image width based on sampling * (i.e. 4:2:2 will have some channels have fewer values). */ int32_t width; /** Horizontal subsampling information. */ int32_t x_samples; /** Vertical subsampling information. */ int32_t y_samples; /** Linear flag from channel definition (used by b44). */ uint8_t p_linear; /** How many bytes per pixel this channel consumes (2 for float16, * 4 for float32/uint32). */ int8_t bytes_per_element; /** Small form of exr_pixel_type_t enum (EXR_PIXEL_UINT/HALF/FLOAT). */ uint16_t data_type; /************************************************** * Elements below must be edited by the caller * to control encoding/decoding. **************************************************/ /** How many bytes per pixel the input is or output should be * (2 for float16, 4 for float32/uint32). Defaults to same * size as input. */ int16_t user_bytes_per_element; /** Small form of exr_pixel_type_t enum * (EXR_PIXEL_UINT/HALF/FLOAT). Defaults to same type as input. */ uint16_t user_data_type; /** Increment to get to next pixel. * * This is in bytes. Must be specified when the decode pointer is * specified (and always for encode). * * This is useful for implementing transcoding generically of * planar or interleaved data. For planar data, where the layout * is RRRRRGGGGGBBBBB, you can pass in 1 * bytes per component. */ int32_t user_pixel_stride; /** When \c lines > 1 for a chunk, this is the increment used to get * from beginning of line to beginning of next line. * * This is in bytes. Must be specified when the decode pointer is * specified (and always for encode). */ int32_t user_line_stride; /** This data member has different requirements reading vs * writing. When reading, if this is left as `NULL`, the channel * will be skipped during read and not filled in. During a write * operation, this pointer is considered const and not * modified. To make this more clear, a union is used here. */ union { uint8_t* decode_to_ptr; const uint8_t* encode_from_ptr; }; } exr_coding_channel_info_t; #ifdef __cplusplus } /* extern "C" */ #endif #endif /* OPENEXR_CORE_CODING_H */