119 lines
3.0 KiB
C
119 lines
3.0 KiB
C
/*
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* Copyright (C) 2013 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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* You can also choose to distribute this program under the terms of
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* the Unmodified Binary Distribution Licence (as given in the file
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* COPYING.UBDL), provided that you have satisfied its requirements.
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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/** @file
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*
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* Pixel buffer
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*
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*/
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#include <stdlib.h>
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#include <errno.h>
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#include <ipxe/umalloc.h>
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#include <ipxe/image.h>
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#include <ipxe/pixbuf.h>
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/**
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* Free pixel buffer
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*
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* @v refcnt Reference count
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*/
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static void free_pixbuf ( struct refcnt *refcnt ) {
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struct pixel_buffer *pixbuf =
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container_of ( refcnt, struct pixel_buffer, refcnt );
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ufree ( pixbuf->data );
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free ( pixbuf );
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}
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/**
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* Allocate pixel buffer
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*
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* @v width Width
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* @h height Height
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* @ret pixbuf Pixel buffer, or NULL on failure
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*/
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struct pixel_buffer * alloc_pixbuf ( unsigned int width, unsigned int height ) {
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struct pixel_buffer *pixbuf;
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/* Allocate and initialise structure */
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pixbuf = zalloc ( sizeof ( *pixbuf ) );
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if ( ! pixbuf )
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goto err_alloc_pixbuf;
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ref_init ( &pixbuf->refcnt, free_pixbuf );
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pixbuf->width = width;
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pixbuf->height = height;
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pixbuf->len = ( width * height * sizeof ( uint32_t ) );
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/* Check for multiplication overflow */
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if ( ( width != 0 ) &&
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( ( pixbuf->len / sizeof ( uint32_t ) ) / width ) != height ) {
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goto err_overflow;
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}
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/* Allocate pixel data buffer */
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pixbuf->data = umalloc ( pixbuf->len );
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if ( ! pixbuf->data )
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goto err_alloc_data;
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return pixbuf;
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err_alloc_data:
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err_overflow:
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pixbuf_put ( pixbuf );
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err_alloc_pixbuf:
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return NULL;
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}
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/**
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* Create pixel buffer from image
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*
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* @v image Image
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* @v pixbuf Pixel buffer to fill in
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* @ret rc Return status code
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*/
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int image_pixbuf ( struct image *image, struct pixel_buffer **pixbuf ) {
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int rc;
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/* Check that this image can be used to create a pixel buffer */
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if ( ! ( image->type && image->type->pixbuf ) )
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return -ENOTSUP;
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/* Try creating pixel buffer */
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if ( ( rc = image->type->pixbuf ( image, pixbuf ) ) != 0 ) {
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DBGC ( image, "IMAGE %s could not create pixel buffer: %s\n",
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image->name, strerror ( rc ) );
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return rc;
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}
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return 0;
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}
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/* Drag in objects via image_pixbuf() */
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REQUIRING_SYMBOL ( image_pixbuf );
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/* Drag in pixel buffer image formats */
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REQUIRE_OBJECT ( config_pixbuf );
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