pixbuf.h

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#ifndef _IPXE_PIXBUF_H
#define _IPXE_PIXBUF_H

/** @file
 *
 * Pixel buffer
 *
 */

FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );

#include <stddef.h>
#include <ipxe/refcnt.h>

/** A pixel buffer */
struct pixel_buffer {
        /** Reference count */
        struct refcnt refcnt;
        /** Width */
        unsigned int width;
        /** Height */
        unsigned int height;
        /** 32-bit (8:8:8:8) xRGB pixel data, in host-endian order */
        uint32_t *data;
        /** Total number of pixels */
        unsigned int pixels;
        /** Total length */
        size_t len;
};

/**
 * Get reference to pixel buffer
 *
 * @v pixbuf            Pixel buffer
 * @ret pixbuf          Pixel buffer
 */
static inline __attribute__ (( always_inline )) struct pixel_buffer *
pixbuf_get ( struct pixel_buffer *pixbuf ) {
        ref_get ( &pixbuf->refcnt );
        return pixbuf;
}

/**
 * Drop reference to pixel buffer
 *
 * @v pixbuf            Pixel buffer
 */
static inline __attribute__ (( always_inline )) void
pixbuf_put ( struct pixel_buffer *pixbuf ) {
        ref_put ( &pixbuf->refcnt );
}

/**
 * Get pixel
 *
 * @v pixbuf            Pixel buffer
 * @v x                 X position
 * @v y                 Y position
 * @ret pixel           Pixel
 */
static inline __attribute__ (( always_inline )) uint32_t *
pixbuf_pixel ( struct pixel_buffer *pixbuf, unsigned int x, unsigned int y ) {
        unsigned int index;

        index = ( ( y * pixbuf->width ) + x );
        return &pixbuf->data[index];
}

extern struct pixel_buffer * alloc_pixbuf ( unsigned int width,
                                            unsigned int height );

#endif /* _IPXE_PIXBUF_H */