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/*
* Copyright (C) 2013 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
* You can also choose to distribute this program under the terms of
* the Unmodified Binary Distribution Licence (as given in the file
* COPYING.UBDL), provided that you have satisfied its requirements.
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
/** @file
*
* Pixel buffer
*
*/
#include <stdlib.h>
#include <errno.h>
#include <ipxe/umalloc.h>
#include <ipxe/image.h>
#include <ipxe/pixbuf.h>
/**
* Free pixel buffer
*
* @v refcnt Reference count
*/
static void free_pixbuf ( struct refcnt *refcnt ) {
struct pixel_buffer *pixbuf =
container_of ( refcnt, struct pixel_buffer, refcnt );
ufree ( pixbuf->data );
free ( pixbuf );
}
/**
* Allocate pixel buffer
*
* @v width Width
* @h height Height
* @ret pixbuf Pixel buffer, or NULL on failure
*/
struct pixel_buffer * alloc_pixbuf ( unsigned int width, unsigned int height ) {
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;
}
/**
* Create pixel buffer from image
*
* @v image Image
* @v pixbuf Pixel buffer to fill in
* @ret rc Return status code
*/
int image_pixbuf ( struct image *image, struct pixel_buffer **pixbuf ) {
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;
}
/* Drag in objects via image_pixbuf() */
REQUIRING_SYMBOL ( image_pixbuf );
/* Drag in pixel buffer image formats */
REQUIRE_OBJECT ( config_pixbuf );
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