From 95851d13057440ddab531e6155fef2e7f3c35b74 Mon Sep 17 00:00:00 2001 From: Michael Brown Date: Tue, 26 Nov 2013 16:28:36 +0000 Subject: [pixbuf] Add generic concept of a pixel buffer Signed-off-by: Michael Brown --- src/core/pixbuf.c | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) create mode 100644 src/core/pixbuf.c (limited to 'src/core') diff --git a/src/core/pixbuf.c b/src/core/pixbuf.c new file mode 100644 index 000000000..48f8e9f9a --- /dev/null +++ b/src/core/pixbuf.c @@ -0,0 +1,75 @@ +/* + * Copyright (C) 2013 Michael Brown . + * + * 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. + */ + +FILE_LICENCE ( GPL2_OR_LATER ); + +/** @file + * + * Pixel buffer + * + */ + +#include +#include +#include + +/** + * 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 ) ); + + /* Allocate pixel data buffer */ + pixbuf->data = umalloc ( pixbuf->len ); + if ( ! pixbuf->data ) + goto err_alloc_data; + + return pixbuf; + + err_alloc_data: + pixbuf_put ( pixbuf ); + err_alloc_pixbuf: + return NULL; +} -- cgit v1.2.3-55-g7522