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#ifndef _IPXE_PNM_H
#define _IPXE_PNM_H
/** @file
*
* Portable anymap format (PNM)
*
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <stdint.h>
#include <ipxe/uaccess.h>
#include <ipxe/image.h>
/** PNM signature */
struct pnm_signature {
/** Magic byte ('P') */
char magic;
/** PNM type */
char type;
/** Whitespace */
char space;
} __attribute__ (( packed ));
/** PNM magic byte */
#define PNM_MAGIC 'P'
/** PNM context */
struct pnm_context {
/** PNM type */
struct pnm_type *type;
/** Current byte offset */
size_t offset;
/** Maximum length of ASCII values */
size_t ascii_len;
/** Maximum pixel value */
unsigned int max;
};
/** Default maximum length of ASCII values */
#define PNM_ASCII_LEN 16
/** PNM type */
struct pnm_type {
/** PNM type */
char type;
/** Number of scalar values per pixel */
uint8_t depth;
/** Number of pixels per composite value */
uint8_t packing;
/** Flags */
uint8_t flags;
/** Extract scalar value
*
* @v image PNM image
* @v pnm PNM context
* @ret value Value, or negative error
*/
int ( * scalar ) ( struct image *image, struct pnm_context *pnm );
/** Convert composite value to 24-bit RGB
*
* @v composite Composite value
* @v index Pixel index within this composite value
* @ret rgb 24-bit RGB value
*/
uint32_t ( * rgb ) ( uint32_t composite, unsigned int index );
};
/** PNM flags */
enum pnm_flags {
/** Bitmap format
*
* If set, this flag indicates that:
*
* - the maximum scalar value is predefined as being equal to
* (2^packing-1), and is not present within the file, and
*
* - the maximum length of ASCII values is 1.
*/
PNM_BITMAP = 0x01,
};
extern struct image_type pnm_image_type __image_type ( PROBE_NORMAL );
#endif /* _IPXE_PNM_H */
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