mirror of
https://github.com/genodelabs/genode.git
synced 2025-01-26 06:09:25 +00:00
80 lines
1.9 KiB
C++
80 lines
1.9 KiB
C++
/*
|
|
* \brief Texture with backing store for pixels and alpha channel
|
|
* \author Norman Feske
|
|
* \date 2014-08-22
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2014-2017 Genode Labs GmbH
|
|
*
|
|
* This file is part of the Genode OS framework, which is distributed
|
|
* under the terms of the GNU Affero General Public License version 3.
|
|
*/
|
|
|
|
#ifndef _INCLUDE__GEMS__CHUNKY_TEXTURE_H_
|
|
#define _INCLUDE__GEMS__CHUNKY_TEXTURE_H_
|
|
|
|
#include <os/surface.h>
|
|
#include <os/texture.h>
|
|
#include <base/attached_ram_dataspace.h>
|
|
|
|
template <typename PT>
|
|
class Chunky_texture : Genode::Attached_ram_dataspace, public Genode::Texture<PT>
|
|
{
|
|
private:
|
|
|
|
typedef Genode::Surface_base::Area Area;
|
|
|
|
/**
|
|
* Calculate memory needed to store the texture
|
|
*/
|
|
static Genode::size_t _num_bytes(Area size)
|
|
{
|
|
/* account for pixel size + 1 byte per alpha value */
|
|
return size.count()*(sizeof(PT) + 1);
|
|
}
|
|
|
|
/**
|
|
* Return base of pixel buffer
|
|
*/
|
|
PT *_pixel()
|
|
{
|
|
return local_addr<PT>();
|
|
}
|
|
|
|
/**
|
|
* Return base of alpha buffer
|
|
*/
|
|
unsigned char *_alpha(Area size)
|
|
{
|
|
/* alpha buffer follows pixel buffer */
|
|
return (unsigned char *)(local_addr<PT>() + size.count());
|
|
}
|
|
|
|
public:
|
|
|
|
Chunky_texture(Genode::Ram_session &ram, Genode::Region_map &rm,
|
|
Genode::Surface_base::Area size)
|
|
:
|
|
Genode::Attached_ram_dataspace(ram, rm, _num_bytes(size)),
|
|
Genode::Texture<PT>(_pixel(), _alpha(size), size)
|
|
{ }
|
|
|
|
/**
|
|
* Constructor
|
|
*
|
|
* \deprecated
|
|
* \noapi
|
|
*
|
|
* This variant is solely meant to be used by deprecated functions.
|
|
* It will be removed if those functions are gone.
|
|
*/
|
|
Chunky_texture(Genode::Ram_session &ram, Genode::Surface_base::Area size) __attribute__((deprecated))
|
|
:
|
|
Genode::Attached_ram_dataspace(ram, *Genode::env_deprecated()->rm_session(), _num_bytes(size)),
|
|
Genode::Texture<PT>(_pixel(), _alpha(size), size)
|
|
{ }
|
|
};
|
|
|
|
#endif /* _INCLUDE__GEMS__CHUNKY_TEXTURE_H_ */
|