mirror of
https://github.com/brl/mutter.git
synced 2024-11-26 18:11:05 -05:00
07e972505c
This adds an internal utility function _cogl_pixel_format_is_endian_dependant() that can query whether accessing the components of a given format depends on the endianness of the current host CPU or whether a pixel can be loaded as a word and channels accessed using bit masking and shifting. Reviewed-by: Neil Roberts <neil@linux.intel.com>
108 lines
3.3 KiB
C
108 lines
3.3 KiB
C
/*
|
|
* Cogl
|
|
*
|
|
* An object oriented GL/GLES Abstraction/Utility Layer
|
|
*
|
|
* Copyright (C) 2010 Intel Corporation.
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library 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
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
*
|
|
*/
|
|
|
|
#ifndef __COGL_PRIVATE_H__
|
|
#define __COGL_PRIVATE_H__
|
|
|
|
#include <cogl/cogl-pipeline.h>
|
|
|
|
#include "cogl-context.h"
|
|
|
|
G_BEGIN_DECLS
|
|
|
|
gboolean
|
|
_cogl_gl_update_features (CoglContext *context,
|
|
GError **error);
|
|
|
|
gboolean
|
|
_cogl_gles_update_features (CoglContext *context,
|
|
GError **error);
|
|
|
|
gboolean
|
|
_cogl_check_extension (const char *name, const char *ext);
|
|
|
|
void
|
|
_cogl_clear (const CoglColor *color, unsigned long buffers);
|
|
|
|
void
|
|
_cogl_read_pixels_with_rowstride (int x,
|
|
int y,
|
|
int width,
|
|
int height,
|
|
CoglReadPixelsFlags source,
|
|
CoglPixelFormat format,
|
|
guint8 *pixels,
|
|
int rowstride);
|
|
|
|
void
|
|
_cogl_init (void);
|
|
|
|
void
|
|
_cogl_push_source (CoglPipeline *pipeline, gboolean enable_legacy);
|
|
|
|
gboolean
|
|
_cogl_get_enable_legacy_state (void);
|
|
|
|
/*
|
|
* _cogl_pixel_format_get_bytes_per_pixel:
|
|
* @format: a #CoglPixelFormat
|
|
*
|
|
* Queries how many bytes a pixel of the given @format takes.
|
|
*
|
|
* Return value: The number of bytes taken for a pixel of the given
|
|
* @format.
|
|
*/
|
|
int
|
|
_cogl_pixel_format_get_bytes_per_pixel (CoglPixelFormat format);
|
|
|
|
/*
|
|
* _cogl_pixel_format_has_aligned_components:
|
|
* @format: a #CoglPixelFormat
|
|
*
|
|
* Queries whether the ordering of the components for the given
|
|
* @format depend on the endianness of the host CPU or if the
|
|
* components can be accessed using bit shifting and bitmasking by
|
|
* loading a whole pixel into a word.
|
|
*
|
|
* XXX: If we ever consider making something like this public we
|
|
* should really try to think of a better name and come up with
|
|
* much clearer documentation since it really depends on what
|
|
* point of view you consider this from whether a format like
|
|
* COGL_PIXEL_FORMAT_RGBA_8888 is endian dependent. E.g. If you
|
|
* read an RGBA_8888 pixel into a uint32
|
|
* it's endian dependent how you mask out the different channels.
|
|
* But If you already have separate color components and you want
|
|
* to write them to an RGBA_8888 pixel then the bytes can be
|
|
* written sequentially regardless of the endianness.
|
|
*
|
|
* Return value: %TRUE if you need to consider the host CPU
|
|
* endianness when dealing with the given @format
|
|
* else %FALSE.
|
|
*/
|
|
gboolean
|
|
_cogl_pixel_format_is_endian_dependant (CoglPixelFormat format);
|
|
|
|
G_END_DECLS
|
|
|
|
#endif /* __COGL_PRIVATE_H__ */
|