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[pixbuf] Add generic concept of a pixel buffer
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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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. | ||
*/ | ||
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FILE_LICENCE ( GPL2_OR_LATER ); | ||
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/** @file | ||
* | ||
* Pixel buffer | ||
* | ||
*/ | ||
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#include <stdlib.h> | ||
#include <ipxe/umalloc.h> | ||
#include <ipxe/pixbuf.h> | ||
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/** | ||
* 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 ); | ||
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ufree ( pixbuf->data ); | ||
free ( pixbuf ); | ||
} | ||
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/** | ||
* 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; | ||
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/* 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 ) ); | ||
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/* Allocate pixel data buffer */ | ||
pixbuf->data = umalloc ( pixbuf->len ); | ||
if ( ! pixbuf->data ) | ||
goto err_alloc_data; | ||
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return pixbuf; | ||
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err_alloc_data: | ||
pixbuf_put ( pixbuf ); | ||
err_alloc_pixbuf: | ||
return NULL; | ||
} |
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#ifndef _IPXE_PIXBUF_H | ||
#define _IPXE_PIXBUF_H | ||
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/** @file | ||
* | ||
* Pixel buffer | ||
* | ||
*/ | ||
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FILE_LICENCE ( GPL2_OR_LATER ); | ||
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#include <stddef.h> | ||
#include <ipxe/refcnt.h> | ||
#include <ipxe/uaccess.h> | ||
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/** A pixel buffer */ | ||
struct pixel_buffer { | ||
/** Reference count */ | ||
struct refcnt refcnt; | ||
/** Width */ | ||
unsigned int width; | ||
/** Height */ | ||
unsigned int height; | ||
/** 32-bit (8:8:8:8) xRGB pixel data, in host-endian order */ | ||
userptr_t data; | ||
/** Total length */ | ||
size_t len; | ||
}; | ||
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/** | ||
* Get reference to pixel buffer | ||
* | ||
* @v pixbuf Pixel buffer | ||
* @ret pixbuf Pixel buffer | ||
*/ | ||
static inline __attribute__ (( always_inline )) struct pixel_buffer * | ||
pixbuf_get ( struct pixel_buffer *pixbuf ) { | ||
ref_get ( &pixbuf->refcnt ); | ||
return pixbuf; | ||
} | ||
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/** | ||
* Drop reference to pixel buffer | ||
* | ||
* @v pixbuf Pixel buffer | ||
*/ | ||
static inline __attribute__ (( always_inline )) void | ||
pixbuf_put ( struct pixel_buffer *pixbuf ) { | ||
ref_put ( &pixbuf->refcnt ); | ||
} | ||
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extern struct pixel_buffer * alloc_pixbuf ( unsigned int width, | ||
unsigned int height ); | ||
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#endif /* _IPXE_PIXBUF_H */ |