pixbuf.c File Reference

Pixel buffer. More...

#include <stdlib.h>
#include <errno.h>
#include <ipxe/umalloc.h>
#include <ipxe/image.h>
#include <ipxe/pixbuf.h>

Go to the source code of this file.

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
static void	free_pixbuf (struct refcnt *refcnt)
	Free pixel buffer. More...
struct pixel_buffer *	alloc_pixbuf (unsigned int width, unsigned int height)
	Allocate pixel buffer. More...
int	image_pixbuf (struct image *image, struct pixel_buffer **pixbuf)
	Create pixel buffer from image. More...
	REQUIRING_SYMBOL (image_pixbuf)
	REQUIRE_OBJECT (config_pixbuf)

Detailed Description

Pixel buffer.

Definition in file pixbuf.c.

Function Documentation

FILE_LICENCE()

FILE_LICENCE

(

GPL2_OR_LATER_OR_UBDL

)

free_pixbuf()

static void free_pixbuf ( struct refcnt *  refcnt )

static

Free pixel buffer.

Parameters

refcnt

Reference count

Definition at line 43 of file pixbuf.c.

                                                  {
        struct pixel_buffer *pixbuf =
                container_of ( refcnt, struct pixel_buffer, refcnt );

        ufree ( pixbuf->data );
        free ( pixbuf );
}

References container_of, pixel_buffer::data, free, and ufree().

Referenced by alloc_pixbuf().

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().

image_pixbuf()

int image_pixbuf	(	struct image *	image,
		struct pixel_buffer **	pixbuf
	)

Create pixel buffer from image.

Parameters

image	Image
pixbuf	Pixel buffer to fill in

Return values

rc	Return status code

Definition at line 97 of file pixbuf.c.

                                                                       {
        int rc;

        /* Check that this image can be used to create a pixel buffer */
        if ( ! ( image->type && image->type->pixbuf ) )
                return -ENOTSUP;

        /* Try creating pixel buffer */
        if ( ( rc = image->type->pixbuf ( image, pixbuf ) ) != 0 ) {
                DBGC ( image, "IMAGE %s could not create pixel buffer: %s\n",
                       image->name, strerror ( rc ) );
                return rc;
        }

        return 0;
}

References DBGC, ENOTSUP, image::name, image_type::pixbuf, rc, strerror(), and image::type.

Referenced by console_exec(), and pixbuf_okx().

REQUIRING_SYMBOL()

REQUIRING_SYMBOL

(

image_pixbuf

)

REQUIRE_OBJECT()

REQUIRE_OBJECT

(

config_pixbuf

)