pixbuf.h File Reference

Pixel buffer. More...

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

Go to the source code of this file.

Data Structures
struct	pixel_buffer
	A pixel buffer. More...

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
static	__attribute__ ((always_inline)) struct pixel_buffer *pixbuf_get(struct pixel_buffer *pixbuf)
	Get reference to pixel buffer. More...
struct pixel_buffer *	alloc_pixbuf (unsigned int width, unsigned int height)
	Allocate pixel buffer. More...

Detailed Description

Pixel buffer.

Definition in file pixbuf.h.

Function Documentation

FILE_LICENCE()

FILE_LICENCE

(

GPL2_OR_LATER_OR_UBDL

)

__attribute__()

static __attribute__ ( (always_inline)  )

inlinestatic

Get reference to pixel buffer.

Drop reference to pixel buffer.

Parameters

pixbuf

Pixel buffer

Return values

pixbuf

Pixel buffer

Parameters

pixbuf

Pixel buffer

Definition at line 36 of file pixbuf.h.

                                           {
        ref_get ( &pixbuf->refcnt );
        return pixbuf;
}

References ref_get, and pixel_buffer::refcnt.

alloc_pixbuf()

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

Allocate pixel buffer.

Parameters

width

Width @h height Height

Return values

pixbuf

Pixel buffer, or NULL on failure

Definition at line 58 of file pixbuf.c.

                                                                               {
        struct pixel_buffer *pixbuf;

        /* Allocate and initialise structure */
        pixbuf = zalloc ( sizeof ( *pixbuf ) );
        if ( ! pixbuf )
                goto err_alloc_pixbuf;
        ref_init ( &pixbuf->refcnt, free_pixbuf );
        pixbuf->width = width;
        pixbuf->height = height;
        pixbuf->len = ( width * height * sizeof ( uint32_t ) );

        /* Check for multiplication overflow */
        if ( ( width != 0 ) &&
             ( ( pixbuf->len / sizeof ( uint32_t ) ) / width ) != height ) {
                goto err_overflow;
        }

        /* Allocate pixel data buffer */
        pixbuf->data = umalloc ( pixbuf->len );
        if ( ! pixbuf->data )
                goto err_alloc_data;

        return pixbuf;

 err_alloc_data:
 err_overflow:
        pixbuf_put ( pixbuf );
 err_alloc_pixbuf:
        return NULL;
}

References pixel_buffer::data, free_pixbuf(), pixel_buffer::height, pixel_buffer::len, NULL, ref_init, pixel_buffer::refcnt, umalloc(), pixel_buffer::width, and zalloc().

Referenced by png_image_header(), and pnm_pixbuf().