Change path

vendor/OpenEXRCore/exr_coding.odin

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+package vendor_openexr
+
+import "core:c"
+/**
+ * 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).
+ */
+transcoding_pipeline_buffer_id_t :: enum c.int {
+	PACKED,
+	UNPACKED,
+	COMPRESSED,
+	SCRATCH1,
+	SCRATCH2,
+	PACKED_SAMPLES,
+	SAMPLES,
+}
+
+/** @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.
+ */
+coding_channel_info_t :: 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.
+	 */
+	channel_name: cstring,
+
+	/** 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)
+	 */
+	height: i32,
+
+	/** 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).
+	 */
+	width: i32,
+
+	/** Horizontal subsampling information. */
+	x_samples: i32,
+	/** Vertical subsampling information. */
+	y_samples: i32,
+
+	/** Linear flag from channel definition (used by b44). */
+	p_linear: u8,
+
+	/** How many bytes per pixel this channel consumes (2 for float16,
+	 * 4 for float32/uint32).
+	 */
+	bytes_per_element: i8,
+
+	/** Small form of exr_pixel_type_t enum (EXR_PIXEL_UINT/HALF/FLOAT). */
+	data_type: u16,
+
+	/**************************************************
+	 * 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.
+	 */
+	user_bytes_per_element: i16,
+
+	/** Small form of exr_pixel_type_t enum
+	 * (EXR_PIXEL_UINT/HALF/FLOAT). Defaults to same type as input.
+	 */
+	user_data_type: u16,
+
+	/** 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.
+	 */
+
+	user_pixel_stride: i32,
+
+	/** 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).
+	 */
+	user_line_stride: i32,
+
+	/** 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.
+	 */
+	using _: struct #raw_union {
+		decode_to_ptr:   ^u8,
+		encode_from_ptr: ^u8,
+	},
+}